Motor Protection – Basics and Types

Induction motors are widely used in industries to meet various requirement. This can be realized by that fact that, around 90% motors used in industries are  Induction motors. The motors plays an important role in the plant process and failure or outage of motor may lead to loss in production or may even hamper the … Read more Motor Protection – Basics and Types

Zero Sequence Filtering in Differential Protection

Zero sequence filtering is a concept used to eliminate zero sequence current component from the secondary current of Current Transformer used in Differential Protection of Transformer. This concept is useful in Transformer having earthed Star winding. What is the Need for Zero Sequence Filtering? Let us have a detailed discussion on this topic. For better … Read more Zero Sequence Filtering in Differential Protection

Harmonic Restraining in Differential Protection

In this post we will discuss about the feature of Harmonic Restraining feature of Differential Protection. First we should know why Harmonic Restraining is needed? Suppose we are going to energize the Transformer, obviously the Transformer will have an Inrush current which is around 6 times of full load current. Refer “Transformer Inrush Current” for … Read more Harmonic Restraining in Differential Protection

Transformer Differential Protection

What is Differential Protection? Differential Protection is based on the fact that any fault within electrical equipment will result into the difference in current entering it and the current leaving it. Thus by comparing the two currents either in magnitude or in phase or both we can determine a fault and issue a trip decision … Read more Transformer Differential Protection