Areva MiCOM P341, Руководство по эксплуатации

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P341/EN O/B11 Operation Guide
CHAPTER 3 Commissioning and
Page 20/80 Maintenance
MiCOM P341
5.3.2 Perform the test
Ensure that the timer is reset.
Apply a current of twice the setting in cell [3503: GROUP 1 OVERCURRENT,
f
>1
Current Set] to the relay and note the time displayed when the timer stops.
Check that the red trip LED has illuminated.
5.3.3 Check the operating time
Check that the operating time recorded by the timer is within the range shown in
Table 13.
Note: Except for the definite time characteristic, the operating times given in Table
13 are for a time multiplier or time dial setting of 1. Therefore, to obtain the
operating time at other time multiplier or time dial settings, the time given in
Table 13 must be multiplied by the setting of cell [3505: GROUP 1
OVERCURRENT, I>1 TMS] for IEC and UK characteristics or cell [3506:
GROUP 1 OVERCURRENT, Time Dial] for IEEE and US characteristics.
In addition, for definite time and inverse characteristics there is an additional
delay of up to 0.02 second and 0.08 second respectively that may need to
be added to the relay’s acceptable range of operating times.
For all characteristics, allowance must be made for the accuracy of the test
equipment being used.
Operating Time at Twice Current Setting and Time
Multiplier/Time Dial Setting of 1.0
Characteristic
Nominal (Seconds) Range (Seconds)
DT [3504:
f
>1 Time Delay] setting Setting ±2%
IEC S Inverse 10.03 9.53 - 10.53
IEC V Inverse 13.50 12.83 - 14.18
IEC E Inverse 26.67 24.67 - 28.67
UK LT Inverse 120.00 114.00 - 126.00
IEEE M Inverse 0.64 0.61 - 0.67
IEEE V Inverse 1.42 1.35 - 1.50
IEEE E Inverse 1.46 1.39 - 1.54
US Inverse 0.46 0.44 - 0.49
US ST Inverse 0.26 0.25 - 0.28
Table 13: Characteristic operating times for
Ι
>1
6. ON-LOAD CHECKS
The following on-load measuring checks ensure the external wiring to the current and
voltage inputs is correct but can only be carried out if there are no restrictions
preventing the energisation of the plant being protected.
Remove all test leads, temporary shorting leads, etc. and replace any external wiring
that has been removed to allow testing.