Live Webinar Series

Instrument transformers are the heart of our protection and control systems, transforming primary system values into the secondary quantities that our relays and meters operate on. However, the electrical power industry is currently undergoing a transition in what these instrument transformers are and how they work. Low Power Instrument Transformers (LPITs), also known as Low Energy Analog Sensors, have become increasingly common as industries transition towards Digital Substation (IEC61850) systems as well as for potential safety benefits, but it is crucial to understand how they differ from the traditional CTs and PTs we’re accustomed to working with not only to understand how to test them, but also how to test the relays they power.

This webinar will discuss some of the types of LPITs, such as Rogowski coils, that you are likely to see in the field, how their output compares to what you might be used to from traditional current and voltage transformers, and how that informs your test practices as a technician or engineer. We will talk through testing a relay powered by an LPIT changes and what signals we need to generate during our relay testing. Also, we will discuss not only the types of signals we have to generate for a relay, but also how physical connections are made to some of these relays to inject the signal and perform the test.

Attendees will get a deeper understanding on LPITs function and purpose along with the ability to verify their operation in association with the relay and overall protection scheme.