Static Relays Basics and Classification: A Static Relays Basics refers to a relay in which the measurement or comparison of electrical quantities is done in a static network which is designed to give an output…
Potential Transformer Tests: The three Potential Transformer Tests are namely, Polarity check, Ratio check and Phasing check. Polarity check: Polarity check in Potential Transformer Tests is performed in the same way as that for a…
Current Transformer Tests: Current Transformer Tests are generally mounted in the switchgear when it is delivered to site and may not be easily accessible. The normal tests which are carried out can easily be performed…
General Methods of Testing Protective Gear: The General Methods of Testing Protective Gear are namely, Primary Injection, Secondary Injection, Measurement of Time, Primary Injection: These tests are limited by the manner in which current can…
Heavy Current Test Plant: Heavy Current Test Plant - Simulating the exact fault conditions as would occur in practice is a difficult and a tedious job. The plant for providing the current for these tests…
Testing of Overcurrent Relay: Test benches are used for proving the design characteristics of relays. These are provided with accurate timing apparatus and calibrated current and voltage supplies. The basic circuit for Testing of Overcurrent…
Classification of Relay Testing: Classification of Relay Testing are usually conducted to demonstrate that: the relay will operate correctly to clear a fault; and the relay will remain inoperative on faults outside its specified zone.…
Three Phase Auto Recloser vs Single Phase Auto Reclose: Three Phase Auto Recloser is one in which the three phases of the transmission line are opened after fault incidence, independent of the fault type, and…
Types of Auto Reclosing: Types of Auto Reclosing can be broadly classified in two categories: Medium voltage auto-reclose where continuity of supply is the principal aim. High voltage auto-reclose where the main considerations are of…
Auto Reclosing Scheme: Auto Reclosing Scheme - It is well realized that the transient faults which are most frequent in occurrence do no permanent damage to the system as they are transitory in nature. These…
