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ABB P-HA-RPS-PEP21013with factory sealed box PHARPSPEP21013

For testing relays with directional feature, current and voltage input signals with adjustable phase shifting are required. Figure 6.2 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 directional feature, one of the input energizing quantity (voltage) shall be applied to the relay with a constant value within its effective range. The other input energizing quantity (current) and phase angle shall be appropriately varied. 

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