A substation protective relay, which was upgraded in a recent project, detects defective equipment at a substation. This upgrade, for one of the main substations on the site, supplying power to the Central Plateau, took the system from analog to digital, adding safety and efficiency. But the process was tedious.
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.
Relays use voltage, current, and frequency set points to initiate an action, and can perform a wide range of functions — from grid isolation to load shedding to turning on a backup generator.
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