Power System Protective Relaying-Part Three

Part Three – Relay Input Sources Wei-Jen Lee, Ph.D., PE Professor of Electrical Engineering Dept. The Univ Un iv.. of Texas at Arlington

Introduction •

Protective relays require reasonably accurate reproduction of the normal, tolerable, and intolerable conditions in the power system fro correct sensing and operation.

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This information input from the power system is usually through current and voltage transformers.

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Some exceptions, such as temperature and vibration relays, which receive their information from other type of transducers.

Introduction

Introduction

Introduction

Part Three – Relay Input Sources Wei-Jen Lee, Ph.D., PE Professor of Electrical Engineering Dept. The Univ Un iv.. of Texas at Arlington