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Testing self-powered relays with SVERKER900
Self-powered relays will be animportant component for the protection of the smart grid.While they allow reducingthe cost of the protection system, they are definitely a challenge for relay test sets, that are required to provide the voltage and current signals to simulate the power system fault, but also the generatedsignals need to have necessary electric power to supply the protection relay.SVERKER 900 is designed to manage this task and this Technical Guide describes how two self-powered relays can be tested.This document guides through the testing of two self-powered overcurrent relaysfrom SEG GmbH (formerly Woodward), WIC-1 and WIP-1, with the relay test set SVERKER 900, for commissioning/maintenance purposes.The Technical Guide details on the principles adopted in the testing with reference to relevant IEC standards and to the relay manuals. In addition,basic instructions on the correct usage of the testing possibilities offered by SVERKER 900are described
Published: 16 October 2020
A Guide to Transformer Ratio Measurements
Transformers are subject to mechanical impact and vibration. Problems or faults occur due to poor design, assembly, handling, poor environments, overloading or poor maintenance. Measuring the polarity and turn ratio of a transformer winding assures that the connections are correct and there are no severe mismatches or opens. Many transformers have taps built into them. These taps allow the ratio to be increased or decreased by fractions of a percent. If any of the ratio changes involve a mechanical movement of a contact from one position to another, these tap changes should also be checked during a ratio test.
Published: 24 January 2019
Pocket guide to PAT testing
this pocket guide we have endeavoured to cover the details of the 4th Edition - rather than clarify the changes – in an easy-to-read manner.
Published: 9 March 2017
The Megger guide to insulating oil dielectric breakdown testing
Gain insight into the different types of oil testing methods, including oil dielectric breakdown testing moisture content testing. This guide covers best practices for oil testing, the correct equipment to use, and the different IEEE/IEC standards to adhere to when testing.
Published: 21 February 2017
Guide to insulation testing above 1kV
This guide discusses the causes of insulation degradation on >1kV power cables, and the process of measuring degradation before a fault can develop. The guide also recommends the best equipment to use with reference to IEEE standards.
Published: 21 February 2017