Atec Megger-CTER91 Manuel d'utilisateur télécharger pdf

CTER-91

Current Transformer Excitation,

Ratio and Polarity Test Set

■

Can test bushing CTs mounted inside

transformer or switchgear

■

Saturation, ratio and polarity tests

performed without changing test lead

connections

■

Overload and short-circuit protection

CTER-91

Current Transformer Excitation, Ratio and Polarity Test Set

DESCRIPTION

The CTER-91 test set is a lightweight, portable unit for

performing excitation, ratio and polarity tests on current

transformers using the voltage-comparison method.

Utilizing the latest technology, Model CTER-91 provides a

variable voltage output and precision instrumentation for

testing single and multiratio CTs. All three tests –

excitation, ratio and polarity – can be performed without

changing any leads.

Current transformers can be tested in their equipment

configuration, such as being mounted in transformers, oil

circuit breakers or switchgear.

It is necessary for the equipment to be totally isolated

from the electrical system prior to testing.

APPLICATIONS

Saturation Test

Model CTER-91 provides a variable voltage output and

digital instrumentation for measuring the excitation voltage

and excitation current that results as the voltage applied to

the CT under test is increased.

As the CT under test begins to saturate, a large increase in

current will be detected for a small increase in voltage.

Ratio Test

The ratio test is performed by comparing a voltage applied

to the secondary winding to the resulting voltage

produced on the primary winding.

For example, if 1 volt per turn is applied to the secondary

winding, the voltage present on the primary winding

would be 1 volt.

More specifically, if 120 volts were applied to the

secondary of a 600/5 current transformer (120:1 ratio), 1

volt would be present on the primary winding.

Polarity Test

Polarity of the current transformer under test is determined

by special circuitry that divides the voltage applied to the

secondary winding by either 10 or 100, depending on

switch position, then adds the result to the primary

voltage.

An increase in magnitude indicates correct polarity, and a

decrease shows incorrect polarity.

FEATURES AND BENEFITS

■

Voltmeter can be used to measure external voltages up

to 600 volts ac.

■

A RUN/HOLD switch freezes readings on instruments

when switched to the HOLD position.

■

A low range of 40 volts is provided for CTs that saturate

at low voltages.

■

The unit provides a high range of 1000 volts.

■

A zero-start interlock is incorporated. This minimizes the

possibility of energizing the CT under test with a sudden

high voltage.

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Résumé du contenu

Page 1 - Ratio and Polarity Test Set

CTER-91Current Transformer Excitation, Ratio and Polarity Test Set Can test bushing CTs mounted insidetransformer or switchgear Saturation, ratio and

Page 2 - ORDERING INFORMATION

CTER-91Current Transformer Excitation, Ratio and Polarity Test SetSPECIFICATIONSInput120 V, 1f, 50/60 Hz OR 240 V, 1f, 50/60 HzOutputContinuously vari

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Atec Megger-CTER91 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Équipement Atec Megger-CTER91. Atec Megger-CTER91 User Manual Manuel d'utilisatio

Résumé du contenu

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