STS 5000 DATA SHEET ISA

User Manual: STS-5000-DATA-SHEET-ISA-

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Mul func on substa on maintenance & commissioning test system for current,
voltage and power transformers.
Capacitance/Tan Delta diagnos c system with the op onal module TD 5000.
• Fully automatic

• Tan Delta test on rotative machines
(generators and motors)

• Primary injection testing capabilities:
up to 800 A or up to 7000 A, with the
optional module BUX

• PADS - Power Apparatus Diagnostic Software
for automatic testing, assessment and report

• Variable output frequency: 15 - 500 Hz

• IEC 61850-9-2 communication protocol

• Power dissipation factor test with the
optional module TD 5000 ( voltage up to
12 kV)

• USB interface and Ethernet interface
for PC connection
• Compact and lightweight

• 2000 V AC high-pot test

• Patented technology for
capacitance and Tan Delta measurement.

• Local control by large graphic display

BUX 2000 BUX 3000 BUX 5000
HIGH CURRENT BOOSTERS

20A DC BOOSTER FOR
WINDING RESISTANCE TEST

STDE POWER TRANSFORMER
DEMAGNETIZER

STCS
SWITCH MODULE

Multifunction Substation Maintenance & Commissioning Test Equipment

The following table lists the tests that can be performed on CTs, VTs, PTs and ground grid.

TEST

1
2

CT
CT

3
4
5
6
7
8
9
10
11
12
13
14
15
16

CT
CT
CT
CT
CT
CT
CT
CT
VT
VT
VT
VT
VT
VT

TEST DESCRIPTION

TEST

Ratio, Voltage mode
Ratio, polarity and burden with high AC
current
Burden, secondary side; ALF/ISF
Excitation curve
Winding or burden resistance
Voltage withstand
Remote polarity check
Rogowski coil transformers
Low power transformers
Tan Delta measurements
Ratio; polarity
Burden, secondary side
Ratio, electronic transformers
Voltage withstand
Remote polarity check
Tan Delta measurements

17
18
19

PT
PT
PT

20
21
22
23
24
25
26
27
28
29

TEST DESCRIPTION

Ratio per TAP
Vector group
Static and dynamic resistance of Tap
Changer contacts
PT
No-load current
PT
Short-circuit impedance
PT
Tan Delta measurements
CB
High DC current micro-Ohmmeter test
CB
Tan Delta measurements
CB, RELAY Current threshold and timing
R
Ground resistance and resistivity
R
Step and touch voltages
L
Measurement of line impedance and of
the related parameters
Capacitor Measurement of the capacitance
Banks

Tests are performed in accordance with the following IEC standards:
IEC61869-2; IEC61869-3; EN 60044-1; EN 60044-2; EN 60044-5; EN
60044-7; EN 60044-8; EN 60076-1, and also in accordance with
ANSI/IEEE C57.13.1. and C57,12-90. Resistance tests are performed
according to the following standards: EN50522, EN61936-1, IEEE802000, IEEE 81-1983, DIN VDE 0101 and CENELEC HD637 s1.

LEGENDA:

RCTD
COMPENSATING REACTOR
TD 5000
CAPACITANCE AND TAN DELTA
MEASUREMENT SYSTEM

POWER TRANSFORMER
TESTING

GROUND GRID
TESTING

CAP CAL
CALIBRATOR MODULE
CURRENT AND VOLTAGE
TRANSFORMER TESTING

SFRA 5000
SWEEP FRENQUENCY
RESPONSE ANALYZER

LINE IMPEDANCE
TESTING

STOIL CELL

ELECTRIC MOTOR
TESTING

STLG MODULE FOR GROUND
TESTING AND LINE IMPEDANCE
MEASUREMENT

STSG SAFETY
GROUNDING MODULE

POWER GENERATOR
TESTING

The following op onal modules enhance the STS 5000 features.
• The high voltage (HV) generator TD 5000 performs the
measurement of the tan Delta, capacitance and power factor of
any device, at the frequency of the mains or in a wide frequency
range.
• The circuit switch op on STCS performs the automa c measurment of PT’s turn ra o, of winding resistance and also tes ng
the opera on of the Load or no-Load Tap Changer.
• The extremely high current BUX 5000, BUX 3000 and BUX 2000
op ons perform high current tests, with currents up to 7000 A.
• The STLG module allows performing high current grid resistance and overhead lines tests.

trolley can also be supplied upon request.
IEC 61850-9-2 Sampled Values
STS 5000 has the facility to test CT, VT, both conven onal and
non conven onal, Merging Unit ( MU ) using the IEC 61850-9-2
(SV ) protocol. The STS 5000 generates current or voltage signal
and injects these quan es into the CT or VT under test.
The STS 5000 then reads the data from the network ( Sample
Values ) in order to perform a variety of diﬀerent tests.
. Possibility to test CT ra o and polarity check up to 800 A, 2000
A ( with BUX 2000 ), 3000 A ( with BUX 3000) or 5000 A / 7000
A (with BUX 5000)
. Possibility to test VT ra o and polarity up to 2 kV
. Test of MU.

The STS family includes 4 models: STS 5000, STS 4000, STS
3000 light and TDX 5000. STS 4000 is not equipped with:
AC and DC high current outputs.TDX 5000 is not equipped
with: AC and DC high current outputs, AC and DC high and
low voltage outputs, and current and voltage meters. STS
5000 and STS 4000 can be connected to the Tan Delta module TD 5000; STS 5000 and 4000 can be also connected to
the very high current module BUX 5000, BUX 3000 and BUX
2000. STS 5000 includes a six-outputs generator: high AC current; low AC current; high DC current; low DC current; high AC
voltage; low AC voltage.
In the local control mode, the selected output is adjustable and
metered on the large, graphic LCD display. With the control knob
and the LCD display, it is possible to enter the MENU mode, that
allows to set many func ons, that make STS 5000 a very powerful tes ng device, with manual and automa c tes ng capabilies, and with the possibility to transfer test results to a PC via
ETHERNET or Pen Drive. The TDMS so ware, which comes with
the test set, allows to download, display and analyse test results
obtained in local mode. Remote maintenance and diagnos c of
the instrument is available via Ethernet. TDMS operates with all
Windows® versions.
The ease of opera on has been the ﬁrst goal of STS 5000. This is
why the LCD display is so large and the dialogue in MENU mode
is made easy. Connec on diagrams are available accordingly
with the test window. STS 5000 includes three measurement
inputs:
. DC voltage (10 V DC).
. AC voltage:
.. High range (300 V AC) - .. Low range (3 V AC)
. Current (10 A AC or DC).
All these inputs are independent among them and allow the measurement of CT or VT outputs or of another source.
In addi on, a digital input (up to 300 V) is available: it can measure the ming of a wet or dry contact. The instrument is housed
in a transportable aluminium box, which is provided with removable cover and handles for ease of transporta on. A transport

TDMS, Test & Data Management Software, is a powerful
software package providing data management for acceptance
and maintenance testing activities. Electrical apparatus data
and test results are saved in the TDMS database for historical
results analysis.
The TDMS database organizes test data and results for the
majority of electrical apparatus tested with ISA test sets and
related software.

TDMS - Test & Data Management Software

PADS - Power Apparatus Diagnostic Software
PADS - Power Apparatus Diagnostic Software is a powerful software application, included in TDMS software, that
optionally allows the remote control of the STS family: STS 5000,
STS 4000, TDX 5000. The software performs various tasks, such as:
. Control STS and TD remotely from PC
. Create test plan
. Download stored test results via Ethernet cable
. Create and customize test reports
. Print test results
This program runs under Windows© environment.
Note: Windows is trademark of Microsoft Corporation.

STS 5000 - FRONT PANEL

Display

Keyboard
Safety Key

Digital
input

Current
input

DC voltage
input

Func on keys
Ac ve
output
AC voltage
input

V/I Output

Power ON/OFF

Multifunction
function knob

Start/Stop

External booster
output

STS 5000 - SIDE PANELS
High-current
output

Remote start
Safety warnings

Emergency
push-bu on

External
devices input
Interfaces

High-voltage
output

TEST PLAN EDITOR is an innova ve and advanced so ware
module allowing the operator to deﬁne and plan a sequence
of tests. The operator deﬁnes the desired sequence of tests
and sets the parameters of each test. TEST PLAN EDITOR
creates a sequence of tests to be performed automa cally. This
feature is available for the test of current, voltage and power
transformers. It is also possibile to create a test sequence for
primary and secondary injec on.

Test plans can be saved or recalled, like test results. Up to 64 setngs can be stored and recalled. Se ngs are permanently stored in the memory and new se ngs can be wri en to the same
address a er conﬁrma on. During the test, test results can be
stored in the memory. At the end of test, se ngs and test results
can be transmi ed to a PC provided with TDMS. The so ware
allows saving, expor ng and analysing test results.

EXAMPLES OF TEST PLAN EDITOR FOR CT TESTS

Nominal values window: from these nominal data,
the program computes the nominal saturation knee.

Tests header window: test reference data.

Tolerances window allows se ng the tolerances for
each of the available tests.

Test selection window: it allows selec ng the test to
be performed.

At the end of the programming, star ng the ﬁrst test will
execute the complete sequence. During the test, test results
are stored in the memory. The test set minimizes the test

dura on, in order to avoid over-hea ng the components. The
same feature is available when controlling the test set via PC
by PADS.

• CT RATIO AND POLARITY VOLTAGE METHOD
The ratio measurement is performed applying high-voltage AC to the CT
secondary and measuring the CT primary voltage. Input parameters are:
the nominal primary and secondary current, from which the program
computes the nominal ratio, the voltage range, the nominal test voltage
and the test frequency. The display shows:
• The voltage output, the secondary voltage and the current during the
test
• Actual ratio and ratio error
• Phase shift and polarity.

• CT RATIO, POLARITY AND BURDEN CURRENT METHOD
The ratio measurement is performed applying high current to the CT
primary and measuring the CT secondary current. The burden can be
by-passed or left in series for the measurement. In this instance, the
voltage drop is measured. The secondary current can be measured by
a clamp. Input parameters are: the nominal primary and secondary
current, from which the program computes the nominal ratio and the
nominal test current. The display shows:
• The actual primary current • The corresponding secondary current
• The value of the secondary current with the nominal primary current
• Actual ratio and ratio error • Phase shift and polarity.
When the burden is tested, the following parameters are displayed:
• The voltage drop across the burden • For the burden: VA rating at the
nominal current, angle and power factor.

• CT BURDEN SECONDARY SIDE
The burden measurement is performed applying low AC current to the
CT burden and measuring the voltage drop.
Input parameters are: the nominal secondary current and the nominal
test current. The display shows:
• The actual current output
• The voltage drop across the burden
• For the burden: VA rating at the nominal current, angle and power
factor
• The actual ALF/ISF.

• CT EXCITATION CURVE
The excitation curve is tested connecting the high AC voltage to the CT
secondary, ramping the voltage and measuring at the meantime the
output current and voltage.
Input parameters are taken from the CT nominal value window. Other
inputs are: maximum test voltage, maximum current and test frequency.
The test set controls the output voltage and current during the test and
stops as the knee is recognized. The display shows:
• The characteristic curve
• The actual voltage knee and the error with respect to the nominal
• The actual current error at knee.

• WINDING RESISTANCE
The resistance (not impedance) is measured connecting the low DC
current source to the winding or burden, and measuring the test current
and the voltage drop. Input parameters are: the nominal resistance, the
connected output, the test current and the resistance limits.
It is also possible to compensate the test temperature. The test set
controls the output current and voltage during the test, and stops as the
test current is reached. The display shows:
• The test current • The voltage drop
• The measured resistance and the compensated resistance
• The test duration and the current deviation when the measurement
was achieved.

• VOLTAGE WITHSTAND
The test is performed connecting the high AC voltage source between
the CT secondary cabling and the ground.
Input parameters are: maximum test current (with automatic switchoff), test time, output range, test voltage, test frequency.
The display shows:
• During the HV ramping, the test voltage and current
• As the test is completed, the maximum current, the total elapsed time
and the isolation impedance.

• REMOTE POLARITY CHECK
The test is performed generating a special AC current waveform on
the primary side and measuring the secondary current drop, with the
optional PLCK polarity checker.
Input parameters are: the test current, the time interval and the test
result (Pass/Fail). The display shows the test current and records the test
result of the different points.

• ROGOWSKI COIL
The test is performed connecting the high AC current source to the
primary side, and connecting the CT secondary side to the low-voltage
measurement. Input parameters are: the nominal primary current and
the nominal secondary voltage, from which the program computes
the nominal ratio, the current range, the test current and the test frequency. The display shows:
• The range current and the test current
• The actual test current, the secondary voltage and the value of the
primary current with the nominal secondary voltage
• Actual ratio and ratio error
• Phase shift and polarity.

• LOW POWER
The test is performed connecting the high AC current source to the
primary side and connecting the CT secondary side to the low-voltage
measurement. Input parameters are: the nominal primary current and
the nominal secondary voltage, from which the program computes the
nominal ratio, the current range, the test current and the test frequency.
The display shows:
• The range current and the test current
• The actual test current, the secondary voltage and the value of the
primary current with the nominal secondary voltage
• Actual ratio and ratio error
• Phase shift and polarity.

• POWER FACTOR, CAPACITANCE AND TAN DELTA
with TD 5000 optional module
The test is performed using the TD 5000 optional module, and then
connecting the high AC voltage source to test target.
Input parameters are: Winding, test voltage and frequency, test mode,
and the nominal capacitance, PF, DF.
The display shows the following data:
• Test voltage, current and frequency
• Capacitance, Tan Delta and power factor
• Power data: active, reactive and apparent
• Impedance: module, argument and components.

• VT RATIO AND POLARITY
The ratio measurement is performed applying high voltage to the VT
primary and measuring the VT secondary voltage. Input parameters
are: the nominal primary and secondary voltage, from which the
program computes the nominal ratio, type of connection (Y or Delta),
the HV range, the nominal test voltage and frequency and the selected
voltage meter. The display shows:
• The actual test voltage • The secondary voltage
• The value of the secondary voltage with the nominal primary voltage
• Actual ratio and ratio error
• Phase shift and polarity.

• VT BURDEN
The burden measurement is performed applying low AC voltage to the
VT burden and measuring the corresponding current.
Input parameters are: the nominal secondary voltage, the voltage
range, the test voltage and frequency.
The display shows:
• The actual voltage output
• The output current
• For the burden: VA rating at the nominal voltage, angle and power
factor.

• RATIO OF ELECTRONIC TRANSFORMER
The ratio measurement is performed applying high voltage to the VT
primary, and measuring the low-level VT secondary voltage. Input
parameters are: the nominal primary and secondary voltage, from
which the program computes the nominal ratio, type of connection (Y
or Delta), the HV range, the nominal test voltage and frequency. The
display shows:
• The actual test voltage
• The secondary voltage
• The value of the secondary voltage with the nominal primary voltage
• Actual ratio and ratio error
• Phase shift and polarity.

• VOLTAGE WITHSTAND
The test is performed connecting the high AC voltage between the VT
secondary cabling and the ground.
Input parameters are: maximum test current (with automatic switchoff), test time, output range, test voltage and test frequency.
The display shows:
• During the HV ramping, the test voltage and current
• As the test is completed, the maximum current, the total elapsed time
and the isolation impedance.

• REMOTE POLARITY CHECK
The test is performed connecting the high AC voltage source to the
primary side and measuring the secondary voltage, with the
optional PLCK polarity sensor.
Input parameters are: the test current, the time interval and the test
result (Pass/Fail). The display shows the test current and records the test
result of the different points.

• POWER FACTOR, CAPACITANCE AND TAN DELTA
with TD 5000 optional module
The test is performed using the TD 5000 optional module and then
connecting the high AC voltage source to the test target.
Input parameters are: Winding, test voltage and frequency, test mode
and the nominal capacitance, PF, DF.
The display shows the following data:
• Test voltage, current and frequency
• Capacitance, Tan Delta and power factor
• Power data: active, reactive and apparent
• Impedance: module, argument and components.

• RATIO PER TAP
The ratio measurement is performed applying high voltage to the PT
primary and measuring the PT secondary voltage for each tap. If the STCS
option is available, connection is performed via the option and the test
is completely automatic. Input parameters are: the nominal primary and
secondary voltage, from which the program computes the nominal ratio,
type of connection (Y or Delta), the type of Tap changer, the HV range, the
nominal test voltage and frequency and the selected voltage meter.
The display shows:
• The test current and angle • The test voltage, primary and secondary
• Actual ratio and ratio error • Phase shift and polarity

• VECTOR GROUP
The test is performed connecting the high AC voltage source between PT
primary windings, while the others are short-circuited. The test is composed
by two measures of secondary windings voltage and phase shift. If the STCS
option is available, connection is performed via the option and the test is
completely automatic.
Input parameters are: the test voltage and frequency, the nominal turn ratio,
the presence of neutral winding.
The display shows:
• Test voltage and frequency
• Test connections
• Phase displacement and connection

• STATIC AND DYNAMIC WINDING RESISTANCE AND TAP
CHANGER TEST
The test is performed applying low DC current to the PT primary plus
Tap Changer and measuring the voltage drop. The tester measures the
resistance peak during the switch and the resistance after the selection.
If the STCS option is available, the connection is performed via the option
and the test is completely automatic. Input parameters are: the tap
number, the type of Tap changer, the current range, the test current, the
nominal resistance and the resistance limits. It is also possible to compensate the test temperature. The test set controls the output current
during the test and issues the Tap Change command. The display shows:
• The test current • The tap number • For the static resistance: the test
voltage and resistance, also compensated • For the dynamic resistance: the
measured values are the Ripple and the Slope and a graphical representation
of current and resistance profiles. The dynamic resistance measurement is
performed also without the STCS option.

• NO-LOAD CURRENT
The test is performed using TD 5000 optional module or using the internal high voltage source up to 2kV and then
connecting the high AC voltage source to the test target.
Input parameters are: the tap number, the type of Tap changer, the test
voltage and the frequency. The test set applies the high voltage and
measures the output current during the test.
The display shows:
• The test voltage
• The current and the phase shift
• The power losses
• The reactance.

• SHORT-CIRCUIT IMPEDANCE
The test is performed applying low AC current to the winding under test,
while other windings are short-circuited and measuring the associated
voltage and phase shift.
Input parameters are: the test current and frequency, the type of
winding and the phase under test. It is also possible to compensate
the test temperature. The test set measures the output voltage and
computes the related parameters. The display shows:
• Phase shift; the power loss; the R, X, Z and inductance of the
transformer
• Short-circuit impedance in Per Unit.

• POWER FACTOR, CAPACITANCE AND TAN DELTA
with TD 5000 optional module
The test is performed using the TD 5000 optional module and then
connecting the high AC voltage source to test target.
Input parameters are: Winding, test voltage and frequency, test mode
and the nominal capacitance, PF, DF.
The display shows the following data:
• Test voltage, current and frequency
• Capacitance, Tan Delta and power factor
• Power data: active, reactive and apparent
• Impedance: module, argument and components.

• CB; PRIMARY AND SECONDARY RELAY TESTS
The selection allows to inject the test parameter and
measuring the relay threshold and trip delay of a breaker or of a
relay. It is also possible to measure external voltages and currents.
With the option BUX 5000 it is possible to perform high current
tests, up to 7000 A. Input parameters are: current range, output current, output voltage and frequency. It is possible to enable the time
measurement on the digital input or on the fall of the applied current (breaker tests) and to set the type of digital input (wet or dry).
The display shows the following data:
• Test current or test voltage• Trip time • Closing time • External
voltage and current measurements.

• CONTACT RESISTANCE
The contact resistance test is performed using the high DC current
output. The test set measures the contact resistance down to the µOhm
range. With the same selection it is also possible to measure higher
resistances. Input parameters are: current output range, test current
and resistance limits. The display shows:
• DC current
• DC voltage
• Resistance.

• SOIL RESISTIVITY
The test of soil resistivity is performed applying AC voltage to the
current spikes and measuring the injected current and the voltage
across the voltage spikes. For the resistivity test, input parameters are:
voltage range, test current, test frequency.
The display shows: location, probes distance, output voltage, voltage
between probes, output current, corresponding resistivity, evaluation.

• GROUND GRID RESISTANCE
The test of ground grid resistance is performed applying current
between the ground grid and the auxiliary ground spikes. With the STLG
option the test is performed using an overhead line to connect to the
remote ground.
For the resistance test, input parameters are: output voltage range, test
current, test frequency. The display shows: test probe distance, output
voltage, test probe voltage, output current, phase shift, earth resistance,
evaluation.

• STEP AND TOUCH VOLTAGES
The step and touch voltages test is performed applying current between
the ground grid and the auxiliary ground spikes and measuring the step
or touch voltage with the test probes. With the STLG option, the current
generation is performed using an overhead line to connect to the
remote ground. Thanks to the STLG option, higher test currents can be
achieved. Input parameters are: substation fault current, fault clearance
time, parallel resistance on the test probes. Other selections are: output
voltage range, test current, test frequency. Last, the operator selects
the measurement mode: manual or on STS and the reference standard.
The display shows the following data: test current, location description,
location coordinates, measured voltage, voltage in case of actual fault.

• LINE IMPEDANCE
The line impedance test has the purpose of verifying the computed
value
of the Earth coefficient KL for the HV overhead lines. This is a critical
parameter for the setting of a distance relay: a wrong value causes
the false fault location. The test is performed injecting current into
the lines, in many modes: line to line, three lines to ground, with or
without current in parallel lines. With the STLG option, the current
generation can be performed even in presence of induced voltages. The
device measures the injected current and the corresponding voltage
drop and phase shift. Input parameters are: maximum test voltage
and test current. Other parameters are the line material and the test
temperature. Tests are performed at frequencies ± 5 Hz with respect to
the line frequency, in order to remove the noise. To the left, the display
shows the measured and computed values of the impedances; to the
right, the computed corrective factors.

• PADS SOFTWARE
The PADS software is a powerful application, included in the TDMS
software, which provides connectivity to the instruments of the STS
family. The software performs various tasks, such as:
• Edit and upload to the instrument the test headers
• Create and modify plans containing one or more tests
• Optionally remote control of the execution of test plans (start,
interruption, results assessment)
• Download and save results of tests previously performed by the
instrument
• Open and save results on the PC
• Print test results.

GENERATOR OUTPUT
The internal generator has six outputs: High AC current, High DC
current, Low AC current, Low DC current, High AC voltage, Low
AC voltage. Output adjustment is automa cally performed once
the test has been set. The generated frequency can be userdeﬁned or synchronized to the supply frequency (with op onal power line synchronizer).The following speciﬁca on applies to the
separate use of these outputs.
High AC current output - supply 230 V AC * /**

CURRENT
OUTPUT
A AC

MAX
POWER
VA

800
600
400
300
200

4800
3780
2560
1940
1300

MAX TEST
DURATION
s
25
200
500
15 min
> 2 hours

FREQUENCY
Hz
15 to 500
15 to 500
15 to 500
15 to 500
15 to 500

NOTE: the output amplitude may decrease for frequency below
50 Hz and above 60 Hz.
. Connec on: two high-current safety sockets, with safety protec on
. Measurement accuracy: < 0.1 % of the reading,< 0.1% of the range
. Phase error: < 0.1°
High DC current output * /**

CURRENT
OUTPUT
A DC
400
300
200
100

MAX
POWER
W
2600
1950
1300
630

MAX TEST
DURATION
s
140
3 min
> 2 hours
>> 2 hours

2000
2000
2000

1.25
1
0.5

2500
2000
1000

60 15 to 500
130 15 to 500
> 2 hours 15 to 500

1000
1000
1000

2.5
2
1

2500
2000
1000

60 15 to 500
130 15 to 500
> 2 hours 15 to 500

500
500
500

5
4
2

2500
2000
1000

60 15 to 500
130 15 to 500
> 2 hours 15 to 500

. Measurement accuracy: < 0.05% of the reading, < 0.05% of the
range.
. Phase error: 0.1° (2000 V range).
The test set measures the current generated by the HV output.

CURRENT
RANGE A
5
0.5
0.05

ACCURACY

PHASE
ERROR
PHASE
< 0.2% reading < 0.05% range < 0.1°
ERROR
< 0.05% reading < 0.05% range < 0.1°
< 0.1% reading < 0.1% range
< 0.2°

Notes:
. Accuracy values refer to the internal measurements of the outputs.
. Accuracies are typical values.
. Output power is reduced with the supply of 110 V.
. The output amplitude may decrease for frequency below 50 Hz and
above 200 Hz.

Low AC current output **
. Maximum output current: 6 A or 3 A AC.
. Maximum output voltage: 70 V AC or 140 V AC.
. Maximum output power: 360 VA.
. Connec on: two safety 4 mm banana sockets.
. Frequency range: 15 - 500 Hz.

. Connec on: two high-current sockets, with safety protec on.
. Accuracy: < 0.2% of the reading, < 0.05% of the range.

Low DC current output **
. Maximum output current: 6 A DC.
. Maximum output voltage: 65 V DC.
. Maximum output power: 360 W.
. Connec on: two safety 4 mm banana sockets.

High AC Voltage output **
The high AC voltage output is isolated by a HV switch inside the
test set. This switch is closed only when the operator selects a
high-voltage test, a er the enable key is turned ON and a er the
START bu on is pressed.
Three voltage ranges are available.

Low AC Voltage output **
. Voltage range: 140 or 70 V AC.
. Output power: 420 VA.
. Frequency range: 15 - 500 Hz.
. Connec on: two safety 4 mm banana sockets.
Output frequency
. AC output frequency range: 15 to 500 Hz.
. Frequency resolu on: 10 mHz.

. Output connec on: two HV safety sockets.
* Output not available on the STS 4000 model.
* * Output not available on the STS 3000 light and TDX 5000 models.

MEASURING INPUTS
Current and Voltage
It is possible to meter the current and the voltage of an external
generator. Three metering groups are available:
• AC or DC current, up to 10 A.
• AC voltage, with two connec ons:
o High range, up to 300 V AC.
o Low range, up to 3 V AC.
• DC voltage, up to 10 V DC.
The selected input is shown in the front panel by a LED.
Resolu on and accuracy

INPUT

RANGE

DC VOLTAGE

1 A; 10 A
1 A; 10 A
300 mV; 3 V;
30 V; 300 V
30 mV
300 mV
3V
10 mV
100 mV
1 V; 10 V

<%0.05 <%0.05
<%0.03 <% 0.08
<%0.15 <%0.05
<%0.05 <%0.05
<%0.1 <%0.25
<%0.08 <%0.08
<%0.03 <%0.08
<%0.05 <%0.15
<%0.05 <%0.10
<%0.03 <%0.08

Binary Input - Timer
The test set allows tes ng protec on relays. In this mode of
opera on, the test current or voltage can be ramped or stepped.
As the output changes, a mer is started; the mer stops as the
Digital input senses that the relay has tripped or the output cut
is cut. Characteris cs of the Digital input:
• The input may be selected as Normal Open, Normal Closed.
• The mer can start from an analog input ( current or voltage).
• The mer can start and stop at the changing of the digital
input, both dry or wet contact.
• Type of input: either dry or under voltage. Maximum input:
300 V AC or DC.
• Voltage thresholds: 5 V, 24 V, 48 V or > 80 V.
• Timer resolu on: 1 ms.
• Imput impedance ≥ 1M Ω

Phase angle
The test set measures the phase angle between the two AC
selected parameters which are used during the test.

MEASUREMENT

RANGE

PHASE

0 - 360

RATIO
BURDEN
RESISTANCE

POLARITY
KNEE POINT

For the CT, VT and PT ra o measurement, the following applies.
• Range: 0 to 9999
• Resolu on: 1
• Accuracy: <%0.15% of the reading <% 0.15% of the range.

ACCURACY
reading & range

AC CURRENT
DC CURRENT

Star ng from the internal and external measurements, the
test set computes the following parameters:

RESOLUTION ACCURACY
0.01°

< 0.1°

Resistance measurement
For the resistance test, the following applies:

SOURCE

RANGE

HIGH DC CURRENT
400 A
LOW DC CURRENT
6A
DC V METER

10 µOhm to
10 mOhm
100 mOhm to
10 Ohm
100 Ohm to
20 kOhm

ACCURACY
< 0.7%
< 0.5%
< 0.3%
< 0.2%
< 0.6%
< 0.5%

. Accuracies are typical values.

COLOUR DISPLAY
The large graphic display has the following characteristics:
• Pixels: 640 x 480, coloured.
• LCD type: TFT.
• View area: 132 x 99 mm.
• Backlight.

OTHER CHARACTERISTICS
Communication interfaces
• ETHERNET for the PC connection.
• USB port for the USB key.
Interfaces to external modules:
• Commands to TD 5000 and STCS.
• Alarms to a flashing light.
• Remote start input.
Mains supply
100-230 V ± 15%; 48-62 Hz.
Maximum supply current: 16 A.
Dimensions: 450 (W) x 400 (H) x 230 (D) mm.
Weight: 29 kg

APPLICABLE STANDARDS
The test set conforms to the EEC directives regarding
Electromagnetic Compatibility and Low-Voltage instruments.
A) Electromagnetic Compatibility: Directive no. 2004/108/EC.
Applicable Standard : EN61326-1:2006
B) Low Voltage Directive: Directive n. 2006/95/EC. Applicable
standards: CEI EN 61010-1:2010. In particular:
. Input/output protection: IP 2X - IEC69529; IP 4X for HV
output.
. Operating temperature: -10° to 55 °C; storage: -20 °C to 70 °C.
. Relative humidity: 5-95% without condensing.

CONNECTION CABLES
.
.
.
.
.
.
.
.

.
.
.
.
.
.
.

One mains supply cable, 2 m long.
One grounding cable, 6 m long.
One interface cable for the USB port.
One ETHERNET interface cable.
One USB pen drive.
Two high-current connection cables, 70 sq. mm, 6 m long
(9 m long optionally), for tests up to 800 A.
Two high-voltage connection cables, 6 m long (10 m long
optionally), 5 kV, with earth screen.
Six connection cables (three red and three black,) 2.5 sq. mm,
6 m long (10 m long optionally), for the connection of:
DC current output, low AC voltage output and digital input.
Four
clamps
to
connect
low
voltage
or
low
current
or
measurements,
two
red
and two black, with a short cable terminating
with a banana socket.
Six “Kelvin” clamps, with two sockets each, to connect
generator and measurement.
One cable for the 3 V measurement connection, shielded, 6 m
long (10 m long optionally).
One cable for the 10 V measurement connection, shielded,
2.5 sq. mm, 6 m long (10 m long optionally).
Four crocodiles for measurements connections (two red and
two black).
One short cable, red, for the current measurement.
One connection cables transport case.
Extra long connection cables for EHV equipment (> 700 kV)
can be supplied optionally.

TRANSPORT CASE
The transit case allows delivering STS 5000 with no concern
about shocks up to a fall of 1 m. This case is supplied with
handles and wheels.

STSA AND STSA 3V SURGE ARRESTERS
These devices apply to all STS models. They limit voltage surges
generated at 10 V or 3 V voltage measurement inputs respectively if, during the winding resistance test, the circuit is erroneously opened. They include a surge arrester plus two fuses.

BUX 2000 BUX 3000 BUX 5000 HIGH CURRENT
BOOSTER
The three op onal current boosters BUX 2000, BUX 3000 and
BUX 5000 allow performing tests up to 2000A, 3000 A or 5000 A.
The op on is made of a module, which incorporates:
• A power transformer, which generates a low-voltage,
high-current output.
• A metering CT, which measures the output current, and sends
the metering to STS 5000.

Op on features:
BUX 2000

TEST CURRENT
A

OUTPUT POWER
VA

TEST DURATION
s

500
1000
2000

700
1500
5000

INFINITE
60
25

BUX 3000

TEST CURRENT
A
1000
2000
3000

OUTPUT POWER TEST DURATION
VA
s
900
2400
4800

INFINITE
300
60

BUX 5000

TEST CURRENT
A
1000
2000
3000
4000
5000

OUTPUT POWER TEST DURATION
VA
s
700
1500
2700
4200
5500

INFINITE
300
30
20
10

• Frequency: 15 Hz - 500 Hz.*
• Weight: BUX 2000 18 kg, BUX 3000 15 kg, BUX 5000 19 kg
without current cables and clamps.
• Dimensions for models BUX 2000 and BUX 3000: external diameter 190 mm; height 120 mm.
STSA

• Dimensions for model BUX 5000: external diameter 200 mm;
height 170 mm.
All high current boosters are supplied with:
. 4 cables, 95 sq. mm, 2 m long, with 2 high current clamps for
BUX 2000
. high current cable, made of 4 cables, 95 sq. mm, 1.2 m long,
with 2 high current clamps for BUX 3000
. 12 cables, 95 sq. mm, 0.8 m long, with 4 high current clamps
for BUX 5000
. one power supply cable , 20 m long
. one measurement cable, 20 m long, with the output current
measurement.
. In addi on, the op on is provided with 2 metering cables for
the connec on of the CT secondary.

20A DC BOOSTER WINDING RESISTANCE TEST
The 20A DC STCS booster allows to perform resistance tests on
a PT with a current up to 20 A DC, instead of the 6 A DC provided
by STS 5000 or STS 4000. The option applies to STS 5000 and STS
4000 and must be connected to STCS, which controls it. Booster
characteristics:
. Maximum output current: 20 A DC
. Maximum power on output sockets: 400 W
. Current output switch: controlled by STCS
. Current output amplitude: controlled by STS 5000 or STS 4000.
The option comes complete with all the necessary connection
cables.

* The output amplitude may decrease for frequency below 50 Hz and
above 60 Hz.

STCS SWITCH MODULE
The external module STCS allows performing automatically
the following PT tests: ratio per tap; winding resistance; OLTC
dynamic test.
The connection to the transformer under test, to STS and to the
measurement taps is performed just once; then, all transformer
tests are performed without interruptions.
20 A DC BOOSTER

STDE POWER TRANSFORMER DEMAGNETIZER

STCS

This option applies to STS 5000 and STS 4000.
Device characteristics:
. Inputs from STS: 300 V AC or 6 A DC.
. Tap Changer Up and Down: 240 V AC or 110 V DC.
. Outputs to STS measurements: 300 V AC or DC and 10 V DC.
The option comes complete with the following connection cables (which can also be ordered separately):
. 10 Coaxial cables, for low voltage connections.
. 2 Cables, 2 m long, for the connection of the STS HV output to
the STCS input.
. 6 Cables, 2 m long, for low voltage connections.
. 1 connection cable to the EXT. DEVICES connector of STS.
. 6 converters, from banana to terminator.
. 8 “Kelvin” type clamps, for the connection of the PT generator
and meter.
. 1 Ground cable, 6 m long.
. 2 Transit cases.

This option allows neutralizing the residual magnetization of the
power transformer core after the winding resistance test. The
principle of the option is to apply a constant current of alternate
polarities to the transformer winding, as per the IEEE 0062 1995
standard.
Device characteristics.
. Constant current, voltage limited generator
. Maximum test current: 7 A DC
. Maximum test voltage: 70 V DC
. Output current stability: better than 0.5% of the rated value
. Automatic current direction reversal.
The option is connected to STS via the control connector, which
supplies its circuits and issues the generation commands.
The power is taken from the STS low-power DC current
generator.
. Housing: plastic case with handle.

STDE

STLG MODULE FOR GROUND TESTING AND LINE
IMPEDANCE MEASUREMENT
The option allows performing both the measurement of: soil
resistivity, ground grid resistance, step and touch tests and
overhead lines zero sequence and mutual coupling coefficients.
This option applies to STS 5000 and 4000 models.
STLG is a high power transformer, which increases the output
current. A high current switch allows selecting the desired
current range. A voltage meter displays the generated voltage.

STSG SAFETY GROUNDING MODULE
During tests, STLG is connected to the overhead line to be
tested. The purpose of the STSG optional device is to protect the
operator against possible high voltage spikes.
STSG incorporates three voltage suppressors and one high
current switch, to connect three lines in parallel. This option
applies to STS 5000 and 4000 models, in conjunction with STLG.
Option characteristics:
. Nominal AC spark-over voltage: 1000 V rms
. Impulse spark-over voltage: 2000 V peak
. Short-circuit proof with 25 kAeff / 100 ms; 36 kAeff / 75 ms
. Connection via three cylindrical ball studs 16, 20 or 25 mm
diameter. The ball diameter must be specified at order.
. Metal aluminum box with handle
. Weight: 9.1 kg
. Dimensions: 41 x 21 x 13.5 cm
. Grounding cable included: 95sq.mm, 2m.

GROUND GRID TEST ACCESSORIES KIT

STLG

The option takes its power from the EXT. BOOSTER connector
of STS. Output current and voltage are metered and sent back
to STS measuring inputs; a third output allows STS to know the
selected range.
Device characteristics are the following:
. Input: from STS 5000, via the booster connector
. Output current ranges: 11, 22, 35, 55, 105 A AC
. Output power: 1800 VA steady; 5200 VA peak for 10 s
. High current range selector switch
. Analogue output voltage meter. Meter range: 600 V AC
. Outputs to STS 5000: selected current output range, output
current and output voltage.
All necessary connection cables are included in the option.
Current clamp provided: 400 A range.
Housing: black plastic case, with handles.
Weight: 25 kg.
Dimensions: 23 x 33 x 44 cm.

STSG

This option applies to STS 5000 and 4000 models. The option is
the kit of connection cables, auxiliary spikes and other accessories that allows connecting STS or STLG to the testing devices
and performing all types of tests. The kit includes:
. Four earth spikes for the soil resistivity test and for the earth
resistance test.
. Two auxiliary earth spikes, for tests in small sites.
. Three cables, wound on wheels, 200 m long.
. One mains synchronizer device, to synchronize the STS generation to the mains.
. Two test probes for the step and touch test.
. One voltage meter, digital, type true RMS, for the earth resistance and step and touch tests.
. One resistor box for the step and touch test.
This kit is not supplied with Line Impedance.

GROUND GRID TEST ACCESSORIES KIT

LINE IMPEDANCE KIT

CURRENT CLAMP

The kit is made of STLG - Line and Grid module and STSG - safety
grounding module, without the line and grid accessories.

The current clamp allows to avoid the opening of the secondary
current circuit when performing the primary test of CT burden.
The clamp ra o is 1000/1; maximum primary current 100 A and
maximum cable diameter 12 mm.

PLCK POLARITY CHECKER MODULE
WARNING STROBE LIGHT
The warning strobe light alerts when the test is completed, or
when there are alarms. The light is self-powered, and turns on
(flashes) upon the test set command. A siren is also included.

TRANSPORT CASES

PLCK POLARITY CHECKER

Checking the correct connection of CT’s and VT’s to protection
relays is a problem because relays can be hundreds of meters
away from the transformer. PLCK easilys solves the issue. When
this test is started, STS 5000 generates a special, not sinusoidal
waveform, which is injected into the connection cables. The
polarity check is easily performed by connecting it at the relay
site. PLCK hast wo lights: green and red. The green light turns
on when the polarity is correct; the red light turns on when the
polarity is wrong.
HEAVY DUTY TRANSPORT CASE

REMOTE SAFETY SWITCH

Transport cases for STS 5000, TD 5000 and BUX 3000 are
available; all of them allow transporting the device with non
concern about shocks or falls up to 1 m. The case is complete
with handles and wheels.

FOLDABLE TROLLEY
The trolley eases the transport of STS 5000, especially when the
optional TD 5000 has to be used too. The trolley is designed to
host both instruments and also the high-voltage cable for TD
5000.

REMOTE SAFETY SWITCH

If it is desired to start the test remotely from the test set, the
optional switch allows to do it, up to the distance of 20 m, which
is the length of the cable provided.

FOLDABLE TROLLEY

SFRA 5000
ANALYZER

SWEEP FREQUENCY RESPONSE

SFRA 5000 is a stand alone sweep frequency response analyzer
for the high accuracy transformer analysis and integrates the
STS and TD 5000 family test sets. The SFRA 5000 offers both
high precision and portability in a single package, providing all
the accessories required for fast, easy to use, reliable and repeatable measurements.
SFRA 5000 is provided with its own embedded software, giving
the possibility to the engineer to zoom into a portion of the
sweep in order to inspect any differences in the plot in more
detail during or after a sweep.

OPTIONAL SOFTWARE
PADS - power apparatus diagnostic software
PADS - Power Apparatus Diagnostic Software is a powerful
software application, included in TDMS software, that allow the
remote control of the STS family: STS 5000, STS 4000, TDX 5000.
These devices allow performing tests of: CTs, VTs, PTs, CBs and
almost all other power devices in electrical substation.

PADS SOFTWARE

SFRA 5000

PADS SOFTWARE

Capacitance and Tan Delta diagnos c system for high-voltage apparatus

• Optional module for STS 5000 and STS 4000
test set, standard module for STS 3000 light
• Tan Delta, capacitance, dissipation factor
measurements and for exciting current test

The following table lists the tests that can be performed on
power transformers and high-voltage apparatus:
• Tan Delta (or dissipation factor DF): from 0 to more than 100%.
• Capacitance: from 1 pF to 200 µF.
• Power factor : from 0 to 100%.

• Output voltage from 12 V up to 12 kV

GENERAL CHARACTERISTICS

• Variable output frequency: 1 - 500 Hz
• PADS - Power Apparatus Diagnostic Software for
automatic testing, assessment and report
• Compact and lightweight
• Patented technology

The high-voltage generator TD 5000 performs the measurement
of the Tan Delta, of the dissipation factor and of the capacitance
of a transformer or of a bushing, at the frequency of the mains
or in a wide frequency range. The measurement is performed
by the module, which is equipped with a patent pending
technology.
The measurement circuitry incorporates a reference high
voltage capacitor, rated 200 pF, with a tan delta better than
0.005%, plus a reference resistor bridge, with accuracy better
than 0.01%, and thermal drift less than 1 ppM/°C. The patented
circuitry and the variable frequency output make test results
immune from external noise.
Available test selections:
• Ungrounded: UST-A; UST-B; UST A+B;
• Grounded: GST; GSTg-A; GSTg-B; GSTg-A+B.
TD 5000 is powered and controlled by STS 5000, STS 4000. Type
of generator: HV generator with electronic control.

Capacitance and Tan Delta diagnostic equipment

GENERATOR CHARACTERISTICS
MAX VOLTAGE
OUTPUT
V

12000
12000
12000

CURRENT
OUTPUT
A

300 mA
125 mA
100 mA

MAX OUTPUT
DURATION
T Max

FREQUENCY
Hz

240 s
> 1 hour
steady

1 to 500
1 to 500
1 to 500

Note1: the maximum voltage output may decrease for frequency below
50hz and above 400Hz.
Note2: at 10 kV the output (current value and duration) has the same
characteristic.

Voltage and current output metering accuracy and resolution.
INTERNAL
MEASURE

RESOLUTION

12000 V AC
1V
5 A AC
0.1 mA
(@ inputs A
or B> 10 mA)
<10 mA AC
0.1 µA
(@ inputs A or B)

TYPICAL
ACCURACY

GUARANTEED
ACCURACY

± % (rdg) ± % (rg)

± 0.2% ± 0.5 V
± 0.2% ± 1 mA

± 0.2% ± 0.1 µA

< 0.3% + 1 V
< 0.5%

< 0.3% + 0.1 µA

. Frequency range: 1 to 500 Hz.
. Connections: by a double shielded HV connector, two Ground
sockets (case and external shield of HV cable), and two measurement sockets (A and B).

teed: 0.1% of the value ± 0.005 % (from 45 to 70 Hz, current
< 10 mA).
. Measurement range 2: from 0 to 100%. Resolution: 5 digits;
accuracy, typical: 0.3% of the value ± 0.02 %; guaranteed: 0.5%
of the value ± 0.02 %.
• Impedance
From 1kOhm to 1400 MOhm. Accuracy, typical 0.3% of the
value ± 0.1%, guaranteed <0.5% of the value. Resolution: 6
digits.
• Power
. Measurement ranges: 10 kW, 100 kW, 1 MW. Resolution (6
digits): 0.1 mW; accuracy: <0.5% of the value ± 1 mW.
The same ranges and accuracies are applied to reactive and
apparent power measurements.
• Inductance
. Measurement range 1: from 1 H to 10 kH. Resolution (6 digits):
0.1 mH; accuracy, typical: 0.3% of the value ± 0.5 mH; guaranteed: 0.5% of the value.
. Measurement range 2: from 100 H to 10 MH. Resolution (6
digits): 1 H; accuracy, typical: 0.3% of the value; guaranteed:
<0.5% of the value.
• Excitation current
. Range 1: 10 mA. Resolution: 0.1 µA; accuracy, typical: 0.2% of
the value ± 0.1µA; guaranteed: 0.3% of the value ± 0.1µA.
. Range 2: 300 mA. Resolution 1 mA; accuracy, typical: 0.2% of
the value ± 1 mA; guaranteed: 0.5% of the value ± 0.5% of the
range.

Output frequency
. AC output frequency range: 1 to 500 Hz.

TEST MEASUREMENTS
• Capacitance
. Measurement range 1: from 1 pF to 5µF. Resolution: 6 digits.
Accuracy, typical: ± 0.03% of the value ± 0.1 pF; guaranteed:
< 0.1% of the value +1pF (from 45 to 70 Hz).
. Measurement range 2: from 5 µF to 200 µF. Resolution: 6
digits. Accuracy, tipical: ±0.1% of the value ±0.1 nF, guaranteed:
<0.5% of the value ±1 nF.
• Tan Delta or dissipation factor DF
. Measurement range 1: from 0 to 10% (capacitive). Resolution:
5 digits; accuracy, typical: 0.05% of the value ± 0.005 %; guaranteed: 0.1% of the value ± 0.005 % (from 45 to 70 Hz, current
< 10 mA).
. Measurement range 2: from 0 to 100%. Resolution: 5 digits;
accuracy, typical: 0.3% of the value ± 0.01 %; guaranteed: 0.5%
of the value ± 0.02 %.
. Measurement range 3: over 100%. Resolution: 5 digits; accuracy, typical: 0.5% of the value ± 0.03 %; guaranteed: 0.8% of
the value ± 0.05 %.
• Power factor PF (or cos(φ))
. Measurement range 1: from 0 to 10% (capacitive). Resolution:
5 digits; accuracy, typical: 0.05% of the value ± 0.005 %; guaran-

Max interference condi ons at line
. Electrosta c: 15 mA rms of the interference current into any
lead or cable with no loss of measurement accuracy. Applicable
to a maximum ra o of interference current to specimen current
20:1.
. Electromagne c: 500 µT, at 50 Hz in any direction.
TD 5000 Dimensions: 440 (W) x 345 (H) x 210 (D) mm.
Weight: 25 kg.

TESTING CABLES
The option comes complete with the following connection
cables:
• 1 yellow-green connection cable, 6 m long, for the ground
connections, terminated with terminator on one side, and with
a clamp on the other side.
• 2 yellow-green connection cables, 1 m long, for the ground
connections, terminated with terminators.
• 1 yellow-green connection cable, 2 m long, for the ground
connections, terminated with terminators.

• 1 power cable to the BOOSTERS connector of STS, 1 m long.
• 1 power cable to the BOOSTERS connector of STS, 2 m long.
• 1 High voltage connection cable, 20 m long, 25 kV, with earth
screen, for the connection to the device under test, terminated
on the device side with an isolated banana plug, and on the TD
5000 side with two plugs: one for the HV and the other one for
the ground. The cable is mounted on a wheel.
• 1 clamp, 25 mm opening, with a connector which mates with
the HV cable.
• 1 bigger clamp, 40 mm opening, with a connector which
mates with the HV cable.
• 2 shielded connection cables, 20 m long, for the connection to
the metering points. Terminated on the TD 5000 side with the
metering connector, and on the device side with a banana plug.
Cables are mounted on wheels.
• 2 clamps, 25 mm opening, terminated with banana sockets,
which allow connecting to the metering point.
• 2 Kelvin type clamps, 40 mm opening, with banana plugs,
which allow connecting to the metering point.
• 1 hot collar cable, 1m long, with connector.
• 1 signals connection cable to the EXT. DEVICES connector of
STS, 1 m long.
• 1 signals connection cable to the EXT. DEVICES connector of
STS, 2 m long.
• 1 connection cables transport case.
• Extra long connection cables for EHV equipment (> 700 kV)
can be supplied optionally.

ductor can be up to 1A for more than 10s. The inductors can be
connected in parallel on the load in order to increase the test frequency. It is possible to connect two RCTD in parallel in order to
have three or four inductors connected together (2 x 80 H total).

CAP CAL CALIBRATOR MODULE
Purpose of the calibrator is to check the correctness of TD 5000
measurement. The calibrator includes an extremely high accuracy high voltage capacitor, which comes with a cer ﬁcate issued
by ISA lab.

CAP CAL

STOIL CELL FOR THE HV TEST OF THE DIELECTRIC OIL
FOLDABLE TROLLEY
The trolley eases the transport of TD 5000 and is designed to
host both instruments and also the high-voltage cable.

TRANSPORT CASE
The transit case allows delivering TD 5000 with no concern
about shocks up to a fall of 1 m.

RCTD COMPENSATING REACTOR
OIL CELL

The option allows testing that the oil characteristics of isolation
are met and that there is no contamination.
The option is made of a suitable glass container with electrodes;
the electrodes are connected to the option TD 5000 for the test
execution. The test result, displayed by STS 5000, is the oil Tan
Delta. Cell characteristics are the followings:
• Maximum test voltage: 12 kV
• Cell volume: about 1l
• Capacitance of the empty cell: 60 pF.
RCTD

This module is useful for testing Tan Delta in rotating machines
with TD 5000 and allows increasing the test current and getting
the maximum test voltage with high capacitive burdens. Each
RCTD is composed by two inductors with a nominal value of 40H
and a steady current of 0.4A. The maximum current on each in-

DIGITAL THERMO HYGROMETER
A number of tests performed by STS, such as coil resistance, Tan
Delta are influenced by temperature and humidity. The option
allows measuring these parameters and to input them into the test
settings. Meter characteristics:
. Temperature range:- 10°C to 60°C.
. Temperature measurement accuracy: ± 0.4°C.
. Humidity measurement range: 5 % to 95% RH.
. Accuracy of humidity measurement: ± 2.5% RH, over the whole range.
. Dimensions: 141 x 71 x 27 mm. Weight: 150 g.

Capacitance and Tan Delta diagnostic equipment

CODE

MODULE

10175

39175
18175

STS 5000 - with TDMS software*, standard
test cable kit, STSA and
heavy duty transport case
STS 4000 - with TDMS software*, standard
test cable kit, STSA and
heavy duty transport case
TDX 5000 with TDMS software*, standard test
cable kit
and heavy duty transport case
STS 3000 light - with TD 5000, TDMS
software*, standard test cable kit, foldable trolley
and heavy duty transport case
TD 5000 module for the high-voltage test of
Tan Delta for transformers and bushings,
supplied with test cables,
heavy duty transport case
and foldable trolley

CODE

MODULE

CODE

10176P

PADS software (primary)- Primary, CTs, VTs
test module*
PADS software (trasfo)- Power transformer
and Tan Delta test module*
PADS (full)- Full software suite (includes
10176P & 10176T)*
BUX 5000 - External Advanced Booster up to
5000 A supplied with transport case
BUX 3000 - External Advanced Booster up to
3000 A supplied with transport case
BUX 2000 - External Advanced Booster up to
2000 A supplied with transport case
STCS Circuit switch module and with
Cable test kit for STCS
20A DC STCS Booster
Step & Touch testing kit:
. ST-LG Line & ground grid module (100 A booster).
. Cables set for STLG
. Heavy duty plastic transport case for STLG
. ST-SG Safety grounding module
. Heavy duty plastic transport case for STSG
. Step & touch, earth resistance/resistivity accessories.
Line Impedance testing kit:
STLG Line & ground grid module (100 A booster).
. Cables set for STLG
. Heavy duty plastic transport case for STLG
. STSG Safety grounding module
. Heavy duty plastic transport case for STSG.
Stud 20 mm for Step & Touch testing kit
Stud 25 mm for Step & Touch testing kit
Stud 16 mm for Step & Touch testing kit
Earth Resistance and Soil Resistivity Kit

27175
13175

37175
20175
37175
65175
38175
31175
11175
37175
11175

10176T
10176F
63175
50175
56175
12175
22175
32175
81175

84175

72175
73175
74175
19102

40175
41175
42175
43175
44175
47175
48175
16102
90175
15175
14175
16175
17175
18175
19175
51175
52175
57175

MODULE
STDE demagnetizer module
STOIL Cell for the eletric test of insulating oil
of the transformer
CAP-CAL Calibration module
PLCK - Polarity checker
Remote safety switch
Warning strobe light
Digital thermo hygrometer
RCTD - Compensating reactor for TD 5000
with transport case
Cable test kit for RCTD
Current Clamp 1/1000 Max 100A
SFRA 5000, supplied with cables, software
and transport case
Cable test kit with case for STS 5000
Cable test kit for TD 5000
Optional long cable test kit for STS 5000
Heavy duty plastic transport case for STS 5000
Trolley for STS family test sets and TD
5000
Heavy duty plastic transport case for TD 5000
Heavy duty plastic transport case for
BUX 3000
BU2000-STS adaptor
Extra long connection cables for EHV
equipment

*PADS - Power Apparatus Diagnos c So ware is NOT included into
basic unit price. It should be expressely ordered.
For USA and Germany, only STS 3000 light with TD 5000 and/or TDX
5000 test sets are available.

NO. TEST OF TEST DESCRIPTION
1
2

CT
CT

3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

CT
CT
CT
CT
CT
CT
CT
CT
VT
VT
VT
VT
VT
VT
PT
PT

Ra o, Voltage mode
Ra o, polarity and burden with high
AC current
Burden secondary side; ALF/ISF
Excita on curve
Winding or burden resistance
Voltage withstand
Remote polarity check
Rogowski coil transformers
Low power transformers
Tan(δ) measurements
Ra o; polarity
Burden, secondary side
Ra o, electronic transformers
Voltage withstand
Remote polarity check
Tan(δ) measurements
Ra o per TAP
Vector Group

20
21
22
23
24
25
26

Sta c and dynamic resistance of Tap
Changer contacts
PT
Excita on current
PT
Short circuit impedance
PT
Tan(δ) measurements
CB
High DC current micro-Ohmmeter test
CB
Tan(δ) measurements
VTCBRELAY Current threshold and ming
R
Ground resistance and resis vity

27
28

R
L

Capacitor Measurement of the capacitance
Banks

STS 5000

STS 4000

TDX 5000
NOT AVAILABLE

WITH BUX

NOT AVAILABLE
NOT AVAILABLE
NOT AVAILABLE
NOT AVAILABLE
NOT AVAILABLE

WITH TD 5000

NOT AVAILABLE

WITH BUX

NOT AVAILABLE

WITH BUX

NOT AVAILABLE

WITH TD 5000
NOT AVAILABLE
NOT AVAILABLE
NOT AVAILABLE
NOT AVAILABLE
NOT AVAILABLE

WITH TD 5000

NOT AVAILABLE

WITH TD 5000
NOT AVAILABLE
NOT AVAILABLE
NOT AVAILABLE

WITH TD 5000

WITH TD 5000
NOT AVAILABLE

WITH TD 5000

WITH TD 5000
NOT AVAILABLE

WITH TD 5000

NOT AVAILABLE

WITH TD 5000
NOT AVAILABLE
NOT AVAILABLE

Step and touch voltages
Measurement of line impedance and
of the related parameters

NOT AVAILABLE
NOT AVAILABLE
WITH TD 5000

WITH TD 5000

The document is subject to change without notice.
Always refer to our technical specification for more
detailed information and as formal contract document.

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