Megger LTC135 Handleiding

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Winding Resistance Measurement

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Dynamic Resistance Measurement

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Switch sequence timing

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Transition/resistor measurement

Description

LTC135 is an accessory for circuit breaker analyzers to test Load Tap

Changers where it delivers test currents for the measurements.

The load tap changer is the only moving part connected to the

transformer windings. Taking a transformer off the system to

investigate an internal problem with a tap changer is an expensive

exercise; therefore it is in every utility’s interest to carry out condition

assessments of their tap changers to help detect developing faults at

an early stage.

LTC135

Load Tap Changer Testing Power Supply

LTC

Supported

measurements

EGIL

(with analog

measurement)

TM1600/

MA61

TM1700

series

TM1800

Single-phase

Continuity testXXXX

Dynamic current/

timing

XXXX

Dynamic voltage/

timing

XXXX

Dynamic resistance

and timing

X

1)

XXX

Motor current

(external clamp-on)

Three-phase

Continuity testXXX

Dynamic voltage/

timing

XXX

Dynamic resistance

and timing

XXX

Motor current

(external clamp-on)

XX

LTC controlXXXX

1) Resistance can be indicated/estimated by combining measured dynamic

voltage and assumed/set test current

LTC135 is designed to be used together with the following Megger

instruments:

▪

EGIL

▪

TM1600/MA61

▪

TM1700 series

▪

TM1800

Together with the circuit-breaker analyzer (CBA) it becomes a a test

setup for performing dynamic measurements on load tap-changers.

The unit can also be used for winding resistance measurements

and other applications where a constant DC current test signal is

requested. It is a power supply designed for DC current testing

of inductive loads with provisions for discharging the transformer

winding when the test is finalized.

Product specificaties