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GE FANUC 531X111PSHARG3 PLC factory sealed

For testing relays with earth fault directional feature, current and voltage input signals with adjustable phase shifting are required. Figure 6.3 shows an example of a single phase test circuit with adjustable voltage and current energizing the MRI3 relay under test. For testing a relay with earth fault directional feature, one of the input energizing quantity (voltage) shall be applied to the relay with a constant value within its effective range.

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