The steps for operating a relay protection tester can be divided into the following stages: ✅ Preparation: ⇨Make sure the tester is connected to a 220V AC power supply and is reliably grounded. This testing used to improve. Calculate pickup values, timing curves, coordination time intervals (CTI), and test injection currents for overcurrent (50/51), differential (87), distance (21), and directional (67) protective relays. Every relay has a provision of setting. Setting determines pick-up value/time. Tests are conducted by the manufacturer at manufacturer s works, and by the user at site during commissioning and periodic maintenance. These tests are further divided into. Relay protection tester (also known as relay protection calibration device) can carry out overcurrent relay test, undervoltage relay test, overvoltage relay test, intermediate relay test, time relay test and other tests, that we use the relay protection tester to carry out these tests the specific. This high-accuracy analog front-end (AFE) reference design measures analog input performance and includes chip diagnostics to help identify power system failures using AC voltage and current measurement AFE using a 4-channel, 24-bit simultaneously sampling differential input delta-sigma ADC for. Relay Test Set: A device that simulates fault conditions and tests relay performance. Insulation Tester: To check the insulation resistance of relay circuits.