Protection relays ensure the safety of an electrical system, protect equipment and provide operators with vital diagnostic information. They work by detecting faults and then tripping circuit breakers to prevent electrical energy from causing damage.
There are a number of AC electrical and timing specifications that must be tested.
These test parameters are:
The relays coil often in the 12V, 24V, or higher.
Due to the critical nature of protection relays, testing during the commissioning stage is crucial for confidence in the operational safety of an electrical system.
Additionally, testing on a regular basis is necessary to ensure correct operation is maintained. This will allow the system to be adequately protected in the event of a fault. When protection relay testing is not carried out on a regular basis, the risk of dangerous electrical faults increases, potentially resulting in damage to equipment and harm to personnel.
We see three main types of protection relay testing (apart from testing after a fault occurs):
As part of protection relay testing, the following items are often tested (depending on test type):
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