Correct possible errors before continuing to test the circuitry.
Test the circuitry.
• Polarity check
• VT circuit voltage measurement (primary injection test)
• Earthing check
• Phase relationship
• Insulation resistance check
The polarity check verifies the integrity of circuits and the phase relationships. The
polarity must be measured as close to the protection relay as possible to ensure that
most of the wiring is also checked.
The primary injection test verifies the VT ratio and the wiring all the way from the
primary system to the protection relay. Injection must be performed for each phase-to-
neutral circuit and each phase-to-phase pair. In each case, voltages in all phases and
neutral are measured.
8.2.4 Checking binary input and output circuits
8.2.4.1 Checking binary input circuits
• Preferably, disconnect the binary input connector from the binary input cards.
• Check all the connected signals so that both the input level and the polarity are in
accordance with the protection relay specifications.
Do not use AC voltage. Binary inputs are rated for DC voltage only.
8.2.4.2 Checking binary output circuits
• Preferably, disconnect the binary output connector from the binary output
cards.
• Check all connected signals so that both load and voltage are in accordance with
the protection relay specifications.
1MRS758754 B Section 8
Commissioning
REC615 and RER615 115
Operation Manual
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