Technical library

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.

A comprehensive guide to testing power quality.

This booklet focuses on the clamp-on method of ground testing and is designed to give the reader a better understanding of the test method and where it can and cannot be used.

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.

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.

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.

Learn more about different kinds of batteries and the maintenance philosophies behind them. This guide also contains practical battery testing methods and test equipment recommendations.

Discover ins and outs of telephony wiring testing, including premise wire trouble conditions, analogue line impairment testing and fault location. Make sure you are testing with the right equipment with the included product guide.

This guide covers the role and function of circuit breakers in a power network, as well as the main types of breaker and prevailing CB technologies. Learn more about failure modes, maintenance strategies and testing methods.

Earth testing and resistivity measuring requires sensitive equipment and sophisticated calculations. This guide makes these processes easier to understand for both large and small ground systems, with detailed studies of various relevant testing methods.