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LTC135 data sheet - .PDF file.

The LTC135 accessory power supply from Megger allows transformer load tap changers to be tested easily and comprehensively. It is designed for use in conjunction with the company’s circuit breaker analysers.

Since tap changers are the only moving parts in transformer systems and are, therefore, the parts most prone to failure, the accurate condition assessment made possible by the LTC135 is an invaluable aid to detecting developing faults at an early stage, according to the company.

The LTC135 uses dynamic resistance measurement (DRM) techniques to perform advanced diagnostic tests on transformer load tap changers. The tests are made during tap changer operation and include load tap changer timing and continuity checks and make-before-break operation of the tap changer contacts.

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Key features and benefits

  • The unit takes measurements when connected to any of Megger’s circuit breaker analysers, including the EGIL, the TM1600, the TM1700 or the TM1800, and the results are displayed, recorded and analysed either on board the instrument or within Megger’s CABA Win software. The unit can also be used with Megger EGIL instruments to carry out dynamic voltage measurement (DVM) tests that provide similar information.
  • The tests reliably detect problems that include build-up of pyrolytic carbon and thick organic films on the tap changer contacts (coking), long-term degradation of the contacts, deviation in switching times, damaged transition resistors and reactors and excessive increase in resistance of the main or arcing contacts.  Much of the information provided by the tests cannot be conveniently be determined by other methods.
  • Depending on the model of circuit breaker analyser with which it is used, the LTC135 offers a range of additional options. These include static winding resistance measurements, three-phase DRM analysis and monitoring of the current drawn by the motor that operates the LTC mechanism. 

Megger

For 100 year Megger has been committed to making electrical measurement of low and high voltage systems more accurate and simple-to-use. It has a reputation for tough, reliable, high quality equipment.

For 100 year Megger has been committed to making electrical measurement of low and high voltage systems more accurate and simple-to-use. It has a reputation for tough, reliable, high quality equipment.

Megger offers equipment for testing breakers, protection relays and CTs, as well as transformers, earthing systems and standby batteries to the electrical generation, transmission and distribution industries. In the LV sector Megger is the market leader for the testing of building wiring to the 17th Edition of the Wiring Regulations and portable appliances.

They have recently acquired a range of water leak detectors

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