The main relay protection functions (overcurrent, directional, differential, distance, etc.) and network communication systems (SCADA, RTUs, digital and analog inputs and outputs, IEC 61850, etc.) are briefly explained in this technical article. Table of contents: 1. Protection systems
The following protection functions are used in this relay. 1. Under Voltage Protection: Under voltages occur due to several reasons like any faults on the system; increase in the amount of loading, loss of an incoming transformer, etc.
Protective relays monitor voltage, current, or frequency and respond to abnormal conditions by opening or closing a switch to isolate parts of a circuit. Based on their switching mechanism, relays can be divided into two categories: electromechanical and static. Electromechanical protective relays use moving parts to open and close switches.
Electromechanical Protective Relays are usually attached to medium voltage circuit breakers to detect abnormalities in the current flowing within the electrical system. The mechanical assembly of relays may become defective due to thermal and/or electrical stress (s).
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