Areva MiCOM P441, Technical Manual

Page: 456 / 636

P44x/EN CM/E33 Commissioning
Page 16/54 MiCOM P441/P442 & P444
4.2.10 Current Inputs
This test verifies that the accuracy of current measurement is within the acceptable
tolerances.
All relays will leave the factory set for operation at a system frequency of 50Hz. If operation
at 60Hz is required then this must be set in cell [0009: SYSTEM DATA, Frequency].
Apply current equal to the line current transformer secondary winding rating to the each
current transformer input of the corresponding rating in turn, checking its magnitude using a
multimeter. Refer to table 8 for the corresponding reading in the relay’s MEASUREMENTS
1 column and record the value displayed.
Cell in MEASUREMENTS 1 column (02) Apply current to
1A line CT 5A line CT
[0201: IA Magnitude] C3-C2 C1-C2
[0203: IB Magnitude] C6-C5 C4-C5
[0205: IC Magnitude] C9-C8 C7-C8
[0207: IM Magnitude] C12-C11 C10-C11
TABLE 8 - CURRENT INPUT TERMINALS
The measured current values on the relay will either be in primary or secondary Amperes. If
cell [0D02: MEASURE’T SETUP, Local Values] is set to ‘Primary’, the values displayed on
the relay should be equal to the applied current multiplied by the corresponding current
transformer ratio set in the ‘VT and CT RATIOS’ menu column (see table 9). If cell [0D02:
MEASURE’T SETUP, Local Values] is set to ‘Secondary’, the value displayed should be
equal to the applied current.
The measurement accuracy of the relay is ±1%. However, an additional allowance must be
made for the accuracy of the test equipment being used.
Cell in MEASUREMENTS 1 column (02) Corresponding CT Ratio
(in ‘VT and CT RATIO column (0A) of menu)
[0201: IA Magnitude]
[0203: IB Magnitude]
[0205: IC Magnitude]
[0A07:Phase CT Primary]
[0A08:Phase CT Sec'y]
[022F: IM Mutual Current Mag]
[0A0B:MComp/CT Primary]
[0A0C: MComp/CT Sec'y]
TABLE 9 - CT RATIO SETTINGS
4.2.11 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 8 for the corresponding reading in the relay’s MEASUREMENTS
1 column and record the value displayed.
Cell in MEASUREMENTS 1 column (02) Voltage applied To
[021A: VAN Magnitude] C19-C22
[021C: VBN Magnitude] C20-C22
[021E: VCN Magnitude] C21-C22
[022B: C/S Voltage Mag]
∗
C23-C24
TABLE 10 - VOLTAGE INPUT TERMINALS
∗
Voltage reference for synchrocheck
Can be PGnd or PP reference with VT bus side or VT line
(see setting description in chapter AP section 4.4)