DEIF RMC-131D/2 relay

DEIF RMC-131D/2 relay

Before any secondary injection tests are carried out, the voltage transformer supply to the relay should be isolated by removing the VT secondary link/fuses. This is to prevent any accidental back energisation of the system via the VT from the test supplies Since the relay has very little hysteresis the pick-up and drop-off values of the relay are very close. This has the effect of causing the led to flicker as the setting is approached. The pick-up value should be taken as the value at which the green timer start led is fully illuminated without flickering. The pick-up value of the relay should be measured with the voltage setting switches in each of the positions shown in Table 1.

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MVTD11 undervoltage relay

The ac voltage should be increased to a value above the setting value and the trip indicator reset. Slowly decrease the voltage until the relay picks up. This will be indicated by the illumination of the green timer start led on the relay frontplate. Record the pick-up value. Repeat the test for each of the values in Table 1. The allowable errors on the voltage settings are ±2% on the lowest setting and ±4% on all other settings. (No allowance has been made for instrument errors).

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