Transcription of FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND …
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FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND …
14 FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND CHARACTERISTICS14 FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND CHARACTERISTICS2 FUNDAMENTAL RELAY-OPERATING PRINCIPLES ANDCHARACTERISTICSP rotective relays are the "tools" of the protection engineer. As in any craft, an intimateknowledge of the characteristics and capabilities of the available tools is essential to theirmost effective use. Therefore, we shall spend some time learning about these tools withouttoo much regard to their eventual CONSIDERATIONSAll the relays that we shall consider operate in response to one or more electrical quantitieseither to close or to open contacts. We shall not bother with the details of actualmechanical construction except where it may be necessary for a clear understanding of theoperation.
Mechanical movement of the operating mechanism is imparted to a contact structure to close or to open contacts. When we say that a relay "operates," we mean that it either closes or opens its contacts-whichever is the required action under the circumstances. Most relays have a "control spring," or are restrained by gravity, so that they assume ...
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