10.6.5 Test the AC Voltage Inputs
Attention! The wiring must be checked in strict accordance with the AC voltage connection
drawings provided.
The purpose of this test is to check whether the wiring of the AC voltage in the cubicle is correct
and whether the sampling precision meets the requirements. The sampling accuracy and polarity
of the device can be checked through sourcing rated AC voltage at the AC voltage input terminal
on the back of the cubicle.
Protection voltage measurement accuracy requirement shall be no higher than 1% or 0.02In.
However, an additional allowance must be made for the accuracy of the test equipment being
used.
Apply voltage equal to the voltage transformer secondary winding rating to each voltage
transformer input in turn, see the following table, checking the magnitude using a multimeter /test
set readout. The corresponding reading can then be checked in the relays menu.
Table 10.6-2 Voltage channel checkout
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