CT Analyzer Brochure Manual ENU

User Manual: CT-Analyzer-Manual-Brochure-ENU

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CT Analyzer
Revolution in current transformer testing and calibration

Revolutionary way of CT testing
Current transformers are used for relaying and metering purposes in electrical power systems. They connect the high
power primary side to the protection and metering equipment on the secondary side. Depending on the application they
are used for, current transformers are designed differently.

Protection current transformers

Metering current transformers

As it is used to feed protective relays, the CT must be accurate during normal and fault conditions. Failures in transformation could lead to misoperation of the relay along with
unwanted and costly outages. To test CTs according to the
requirements of modern protection systems, it is compulsory to consider the CT performance at rated frequency for
normal and overcurrent operation. Also transient components and auto-reclosure systems must be considered.

Metering CTs must provide high accuracy up to class 0.1
to guarantee correct metering and billing. It is therefore
essential to test and calibrate the metering CT, as the accuracy of the metering chain depends on the accuracy of the
CT feeding the meter.
In contrast to protection CTs, metering CTs should go into
saturation beyond the nominal primary current level to
protect the connected metering equipment.

Automated testing procedure
1 Measurement of parameters
Measurement of CT parameters
like excitation curve, eddy current,
ratio, etc.

The CT Analyzer is designed to
accurately measure all relevant
CT parameters and compare
them to the requirements of the
defined IEEE or IEC standard. Due
to this automated assessment,
testing engineers receive the
‘pass or fail’ decision within
seconds.

2

2 Modeling
Definition of CT model elements and
calculation of CT parameters through
embedded mathematical functions

CT Analyzer – a new way of testing CTs

The CT Analyzer offers a wide range of measurements,
such as:

The CT Analyzer is the most complete and easy-to-use
testing system for protection and metering CTs according
to IEEE and IEC standards. It allows all types of single and
multi-ratio current transformers to be tested in labs and on
site in power system grids. Manufacturers, utilities, service
providers and other CT operators use the CT Analyzer in
production, labs, test fields, and on site.

> CT ratio and phase-angle accuracy
> CT accuracy for different burdens
> CT winding resistance
> CT excitation characteristics
> CT inductance (saturated and unsaturated)
> ALF and FS (direct and indirect)
> Burden impedance
> CT residual magnetism

3 Assessment according
to IEEE or IEC standard
Automated comparison of test results with
the defined values / limits according to the
selected IEEE or IEC standard

4 Reporting
All data is delivered in an XML file
and can be displayed via the
reporting tool

Your benefits
> Field verification of CTs up to the 0.1
accuracy class due to extremely high
accuracy (0.02 % typical)
> Compact and lightweight
(< 8 kg / 17.4 lbs)
> Automatic assessment in accordance
with IEEE and IEC standards
> Reduced testing time (typically < 1 min)
> High noise immunity for on-site testing
www.omicronenergy.com/CT-Analyzer

3

Highly accurate CT calibration and verification made mobile
The ideal way of testing a current transformer
Due to the continuous expansion of the power system grids the reliability of the installed equipment becomes more and
more important. This makes the use of additional metering and protection CTs necessary. To test all of these
CTs in a cost-effective and reliable way, the ideal CT test device fulfills the following requirements:

Mobility

Accuracy

Test engineers often have to maintain several CTs within
one utility. The ideal CT test device would therefore be
an all-in-one solution, light enough to be carried by
one person. It should be able to measure all parameters
without the need for any further equipment
(such as burden boxes).

Correct billing is only possible if metering CTs work within
their specifications, for all secondary burdens and levels of
primary current that are defined in the standards. To test
and calibrate these metering CTs, measurement equipment
delivering reliable results up to class 0.1 CTs is needed.

Mobility

Accuracy

Safety

Handling

Primary nominal current injection

Primary current injection

> Approx. 2 tons of equipment (high current source,

> > 30 kg / 66.1 lbs (Not including additional

huge cables, current booster, burden box etc.)

> High accuracy, but complicated wiring makes
testing error-prone

> Not sufficient for high accuracy metering CTs
> Sensitive to transient distortion from life signals
(due to the use of 50 Hz test signals)

> Uses dangerously high voltages and currents
(primary nominal current injection)

> Typical current levels of 500 A to 800 A are used

> Re-wiring is required for each type of test

> Requires several people to set-up and

(e.g. ratio, polarity, saturation, winding resistance)

conduct the test

IP

equipment, e.g. external burden box)

> Test results must be assessed manually

IS

IP

IS

A

4

Safety

Handling

Equipment for testing CTs on-site must comply to applicable
safety standards and regulations. However, the ideal test
device should avoid the use of high test currents and voltages and conduct tests with as low test voltages as possible to
reduce the operator´s health and safety risks.

Short measurement times and an automated assessment
to the respective IEC and IEEE standards characterize
modern test equipment. All relevant parameters should
be measured in one test cycle without the need for
rewiring. Printable test reports, including all measured
data and the assessment to the standard, are ideally
created automatically by the test device.

Secondary voltage injection
> > 30 kg / 66.1 lbs (Not including additional
equipment, e.g. external burden box)

> Not sufficient for high accuracy metering CTs
Sensitive to transient distortion from life signals
(due to the use of 50 Hz test signals)

> Voltages for saturation tests can be
2,000 V or more

> Re-wiring is required for each type of test
(e.g. ratio, polarity, saturation, winding resistance)

Model-based CT testing

> < 8 kg / 17.4 lbs; ideal for handling on site

> Measurement of class 0.1 metering CTs
> Excellent noise suppression guaranteed
> Highly accurate on-site testing even if active lines
are close to the test object

> Maximum output voltage of 120 V

> One-step test determining all parameters (< 1 min)
> Automated assessment to standard and

> Test results must be assessed manually

VP

integrated report functionality

VS

U

VP

U

5

VS(f)

Extraordinary features
RemAlyzer
> Software-based tool to determine the residual magnetism in
current transformers

> Analysis of the remanence condition before putting into
operation the CT to assure proper function

> Simplifies power grid failure analysis after unwanted operation
of protective relays

> Demagnetizes the CT core after measurement

Remote control
> Full access to all functions of the CT Analyzer via a PC using
the remote interface

> Optimizes the integration into automated testing procedures in
production lines

> Data export into ExcelTM and WordTM
> Customizable testing and reports

Network simulation and relay testing
> Easy transfer of CT Analyzer measurement data to NetSim
(Test Universe module) and RelaySimTest (stand-alone software)
for network simulation and relay testing

> Calculation of current and voltage signals based on accurate
modelling of energy networks and the resulting time constants

> Behavior analysis of protective system in case of CT saturation
> Support of several simultaneous CT simulations e.g. for test on
differential protection

Data handling and reporting
> Test reports can be saved on the Compact Flash Card and
transferred to a PC

> Data and protocols can be shown on a PC via the
ExcelTM file loader program

> Customizable report templates are available, for example:
> Different standards, classes and applications
> Single, multi-core and multi-tap CTs
> Three-phase testing
> Core testing

6

Manual testing: QuickTest
> Use of the CT Analyzer as a multimeter with an integrated
current and voltage source (DC and AC)

> Perform manual tests (L, Z, R, ratio, polarity, burden etc.) for
trouble-shooting and quick verification on site

> VT ratio check

CPOL2: Polarity checker using QuickTest
> Check of correct polarity along the different connection points
in CTs‘ secondary wiring

> Analysis of sawtooth signal injected by the CT Analyzer

CT SB2 switch box
> Automated testing of multi-tap CTs without the need for
rewiring

> Includes terminals for burden and primary resistance tests
> CTs with up to six taps can be tested
> Automatic wiring check before measuring
> Use attached to the CT Analyzer or as a standalone unit

„Guessing“ nameplates
> Determination of unknown CT data
before test

> Older CTs can be classified and put into service without
contacting the manufacturer

after test

> Determinable parameters include:
> CT type
> Class
> Ratio
> Knee point
> Power Factor
> Nominal and operating burden
> Winding resistance (primary and secondary)

Simulation and reuse of measurement results

POWER

> Existing measurement data can be loaded to the CT Analyzer
at any time

> Recalculation of the CT parameters for different burdens
and primary currents

> No further on-site measurements are necessary to verify whether
a change in the burden will influence the accuracy of a CT
7

VA

cos Phi

15

0.8

7.5

0.8

3.75

1

0

1

Current ratio error in % at % of rated current

Burden in %

1%

5%

10%

20%

50%

100%

120%

100

-0.023

-0.023

-0.021

-0.018

-0.013

-0.010

-0.009

200%
-0.008

25

-0.023

-0.023

-0.021

-0.018

-0.013

-0.010

-0.009

-0.008

100

-0.008

-0.010

-0.010

-0.008

-0.006

-0.004

-0.003

-0.002

25

-0.008

-0.010

-0.010

-0.008

-0.006

-0.004

-0.003

-0.002

100

0.005

0.001

0.000

-0.001

0.000

0.000

0.001

0.001

25

0.005

0.001

0.000

-0.001

-0.000

0.000

0.001

0.001

100

0.007

0.005

0.004

0.003

0.003

0.003

0.004

0.004

25

0.007

0.005

0.004

0.003

0.003

0.003

0.004

0.004

Technical data, Services
Technical data CT Analyzer
Current ratio accuracy

Output

Ratio 1 ... 2000

0.02 % (typical) / 0.05 % (guaranteed)

Ratio

2000 ... 5000

0.03 % (typical) / 0.1 % (guaranteed)

Output current

0 ... 5 Aeff (15 Apeak)

Ratio

5000 ... 10000

0.05 % (typical) / 0.2 % (guaranteed)

Output power

0 ... 400 VAeff (1500 VApeak)

Output voltage

0 ... 120 VAC

Physical dimensions

Phase displacement
Resolution

0.1 min

Accuracy

1 min (typical) / 3 min (guaranteed)

Size (W × H × D)

360 × 285 × 145 mm /
9.2 × 7.2 × 3.7 in

Weight

8 kg / 17.4 lbs (without accessories)

Environment conditions

Winding resistance
Resolution

1 mΩ

Operating temperature -10 °C ... + 50 °C / 14 °F ... 122 °F

Accuracy

0.05 % (typical) /
0.1 % + 1 mΩ (guaranteed)

Storage temperature

-25 °C ... + 70 °C / -13 °F ... 158 °F

Humidity

Relative humidity 5 % ... 95 % not condensing

Certificates from independent test institutes

Power supply
Input voltage

100 VAC ... 240 VAC

KEMA Test Report

Permissible input voltage

85 VAC ...264 VAC

PTB Test Report

Frequency

50 / 60 Hz

Wuhan HV Research Test Report

Permissible frequency

45 Hz ... 65 Hz

Input power

500 VA

Connection

Standard AC Socket IEC 60320

Optional services
Calibration according to ISO / IEC 17025 for new CT Analyzers
Recalibration according to ISO / IEC 17025 for CT Analyzers

Technical data CT SB2
Input Current

0.2 A

Dimensions (W x H x D)

284 x 220 x 68 mm / 11.2 x 8.7 x 2.7 in

Weight

5.7 lbs / 2.6 kg

Technical data CPOL2
Measuring range

250 μVRMS ... 300 V RMS

Evaluated signal form

Polarity test signal with slope ratio ≥ 3:1

Nominal frequency

52.6 Hz

Power consumption

Measurement active: < 100 mW
Standby: 50 μW

Input impedance

> 300 kΩ

8

Batteries

Type and number:
2 × 1.5 V Mignon LR6
AA AM4 MN1500

Dimensions (W × H × D)

180 × 55 × 35 mm /
7.1 × 2.2 × 1.4 in

Weight

150 g / 0.33 lb

Standard
Package

Advanced
Package

IEEE Metering
Test Set

IEEE Protection
Test Set

>> IEC 61869-2 / 60044-1, or IEEE C57.13 for CTs of accuracy classes ≥ 0.3

■

■

■

■

>> IEC 61869-2 / 60044-1 / 60044-6 / IEEE C57.13 / C57.13.6 for CTs of accuracy classes ≥ 0.1

–

■

–

–

>> IEEE C57.13 for CTs of all metering accuracy classes, incl. 0.15 and 0.15S

–

–

■

–

>> IEEE C57.13 of protection class CTs

–

–

–

■

Determination of ALF/ALFi and FS/FSi, Ts, and composite error for nominal and connected burden

■

■

–

–

CT ratio and phase measurement with consideration of nominal and connected secondary burden

■

■

■

■

CT winding resistance measurement (primary and secondary)

■

■

■

■

>> Saturation characteristic measurement

■

■

■

■

>> Comparison of excitation curve to a reference curve

■

■

■

■

CT phase and polarity check

■

■

■

■

Secondary burden measurement

■

■

■

■

Automatic demagnetization of the CT after the test

■

■

■

■

„Nameplate guesser“ function for CTs with unknown data

■

■

■

■

RemAlyzer tool which determines the residual magnetism in CTs

□

□

□

□

Remote control interface

■

■

■

■

QuickTest: Manual testing interface (L, Z, R, ratio, polarity, burden etc.)

■

■

■

■

Simulation of measured data with different burdens and currents

■

■

■

■

Knee-point voltage from 1 V up to 4 kV can be measured

■

■

■

■

Knee-point voltage from 1 V up to 30 kV can be measured

–

■

–

–

Measurement of transient behavior of TPS, TPX, TPY and TPZ type CTs

–

■

–

–

Determination of the transient dimensioning factor (Ktd)

–

■

–

–

Considering Duty Cycles C-O / C-O-C-O e.g. auto-reclosure system

–

■

–

–

Allows testing of CTs for power frequencies of 50 Hz

■

■

–

–

Allows testing of CTs for power frequencies of 60 Hz

■

■

■

■

CT SB2 (switch box) for measurements of CTs with up to 6 taps including accessories

–

–

–

■

CPOL2 checks the correct polarity along the different connection points in CTs‘ secondary wiring

□

□

□

□

Calibration according to ISO / IEC 17025 for new CT Analyzers

□

□

□

□

Recalibration according to ISO / IEC 17025 for CT Analyzers

□

□

□

□

Features of CT Analyzer Packages
Automatic assessment according to

CT excitation curve

■
9

included

□

optional

– not included

Ordering Information
CT Analyzer Packages
Description

Ordering No.

Standard Package incl. accessories

For measurements and automatic assessment on CTs with
accuracy classes ≥ 0.3 according to IEC and IEEE standards

VE000656

Advanced Package incl. accessories

Expanding standard package functionality
to accuracy classes ≥ 0.1

VE000654

IEEE Metering Test Set

For metering CTs with accuracy classes ≥ 0.15
according to IEEE C57.13
(does not support protection CTs)

VE000658

IEEE Protection Test Set

For protection CTs according to IEEE C57.13
(does not support metering CTs)

VE000657

Description

Ordering No.

Upgrade Standard - Advanced

Upgrades Standard Package to Advanced Package

VESM0653

IEEE Metering - Advanced Upgrade

Upgrades IEEE Metering Test Set to Advanced Package

VESM0656

IEEE Protection - Advanced Upgrade

Upgrades IEEE Protection Test Set to Advanced Package

VESM0654

CT Analyzer Standard Package

Package Upgrades

Find detailed ordering information and package descriptions on www.omicronenergy.com

10

CT Analyzer Accessories
Description

Ordering No.

CT SB2 incl. accessories

Switch box for measurements on CTs with up to 6 taps

VEHZ0696

Training CT

Class 0.5 CT for training purposes. FS 5, ratio = 300:5

VEHZ0643

Calibration CT

High-precision CT (class 0.02) for calibration purposes.
Ratios = 2000:1 / 2000:5

VEHZ0649

CPOL2

Polarity checker for CTs‘ secondary wiring

VEHZ0702

Description

Ordering No.

Determines the residual magnetism in CTs

VESM0657

Description

Ordering No.

Recalibration of high-precision CT

Recalibration of high-precision CT according to
ISO / IEC 17025 (recommended every 1-2 years)

VEDK9055

Calibration of new CT Analyzers

Calibration of new CT Analyzer devices
according to ISO / IEC17025 (certificates included)

VEDK9002

Recalibration of
CT Analyzers in service

Recalibration of CT Analyzer devices
according to ISO / IEC17025
(certificates included, recommended every 1-2 years)

VEDK9051

Software Tool

RemAlyzer

Calibration Services

11

OMICRON is an international company serving the electrical power industry with
innovative testing and diagnostic solutions. The application of OMICRON products
allows users to assess the condition of the primary and secondary equipment on
their systems with complete confidence. Services offered in the area of consulting,
commissioning, testing, diagnosis and training make the product range complete.
Customers in more than 150 countries rely on the company’s ability to supply leading
edge technology of excellent quality. Service centers on all continents provide a broad
base of knowledge and extraordinary customer support. All of this together with our
strong network of sales partners is what has made our company a market leader in the
electrical power industry.

The following publications provide further information on the solutions described in this
brochure:

CT SB2
Multi-Ratio Switch-Box for CT Analyzer

The CT SB2 Switch-Box is an accessory for the CT Analyzer that
enables the automatic testing of multi-ratio current transformers
(CTs) with up to 6 tap connections (X1 to X6). The CT SB2 is
connected to all the taps of a multi-ratio CT as well as to the CT
Analyzer. Thus every ratio combination can be tested automatically
by the CT Analyzer.

Convenient Features
The CT SB2 offers many convenient features for testing:
•

6 channel secondary connection terminals

•

Color-coded terminals and cables to avoid connection errors

•

Automatic wiring check to help with trouble-shooting

•

Easy test setup using the CT Analyzer User Interface

•

Terminals for connection of primary resistance and secondary
burden for full automatic test without re-wiring during test

Mobile – Compact – Automated
Depicted: CT SB2

Flexibility on-site
The CT SB2 can be easily attached to the CT Analyzer or placed
separately beside. With a combined weight of 11 kg / 24 lbs,
the CT Analyzer with the CT SB2 is convenient to carry and handle
on-site. The CT SB2 makes the CT Analyzer the most flexible and
complete solution for testing multi-ratio CTs.

CT SB2
Input Voltage

Scope of Delivery CT SB2

100 - 240 V

Input Frequency

50 - 60 Hz

Input Current

0.2 A

Output Voltage*

0 - 120 V

Output Current*

0-5A

Output Power*

0 - 400 VA

Dimensions (W x H x D)

284 x 220 x 68 mm
11.2 x 8.7 x 2.7 in

Weight

2.6 kg / 5.7 lbs

Order Number

VEHZ0696
* Output of CT Analyzer

Datasheet CT SB2
Switch Box

For more information, additional literature, and detailed contact information of our
worldwide offices please visit our website.

www.omicronenergy.com

© OMICRON L2736, June 2017
Subject to change without notice.



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