Areva MiCOM P341, Руководство по эксплуатации

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Operation Guide P341/EN O/B11
Commissioning and CHAPTER 3
Maintenance Page 17/80
MiCOM P341
Menu Cell
Corresponding CT Ratio
(in ‘VT and CT RATIO
column (0A) of menu)
[0207: MEASUREMENTS 1,
f
N Measured Mag]
[0A09: E/F CT Primary]
[0A0A: E/F CT Sec'y]
[020B: MEASUREMENTS 1,
f
SEF Magnitude]
[0A0B: SEF CT Primary]
[0A0C: SEF CT Sec'y]
Table 10: CT ratio settings
4.2.9 Voltage inputs
This test verifies the accuracy of voltage measurement is within the acceptable
tolerances.
Apply rated voltage to each voltage transformer input in turn, checking its magnitude
using a multimeter. Refer to Table 11 for the corresponding reading in the relay’s
MEASUREMENTS 1 column and record the value displayed.
Menu Cell Voltage Applied To
[021A: MEASUREMENTS 1, VAN Magnitude] C19 – C22
[021C: MEASUREMENTS 1, VBN Magnitude] C20 – C22
[021E: MEASUREMENTS 1, VCN Magnitude] C21 – C22
[0220: MEASUREMENTS 1, VN Measured Mag] C23 – C24
Table 11: Voltage input terminals
The measured voltage values displayed on the relay LCD or a portable PC connected
to the front communication port will either be in primary or secondary volts. If cell
[0D02: MEASURE’T SETUP, Local Values] is set to ‘Primary’, the values displayed
should be equal to the applied voltage multiplied by the corresponding voltage
transformer ratio set in the ‘VT and CT RATIOS’ menu column (see Table 12). If cell
[0D02: MEASURE’T SETUP, Local Values] is set to ‘Secondary’, the value displayed
should be equal to the applied voltage.
Note: If a PC connected to the relay via the rear communications port is being
used to display the measured voltage, the process will be similar. However,
the setting of cell [0D03: MEASURE’T SETUP, Remote Values] will determine
whether the displayed values are in primary or secondary Volts.
The measurement accuracy of the relay is ±1%. However, an additional allowance
must be made for the accuracy of the test equipment being used.