P12x/EN CM/A96
Commissioning and Maintenance
Page 14/18
MiCOM P120/P121/P122/P123
4.3.2.4
I>> threshold
Values to be recorded
l>> threshold for each phase
tl>> time delay for each phase
I>> threshold check:
If tI>> time delay is short, gradually raise the injection current up to the value of I>>
threshold.
If tI>> time delay is long, inject 0.95 x I threshold and check there is no trip. Then inject 1.1 x
I threshold and check the trip output is close.
Gradually lower the injected current and note the value of the drop out I>> threshold.
Checks:
Display of an alarm message on the front panel LCD.
Alarm LED flashes
Trip LED on
I>> threshold LED on (if programmed).
Trip output closes.
I>> threshold output closes (if programmed).
tI>> time delay check:
Apply a current onto one of the phases and measure the time delay tI>> by pre-setting the
current above the I>> threshold (I injected > 2 x I threshold).
Apply a current onto one of the phases and measure the time delay tI>> by pre-setting the
current above the I>> threshold (I injected > 10 x I threshold).
4.4 Final
checks
The tests are now complete. Remove all test or temporary shorting leads, etc… If it is
necessary to disconnect any of the external wiring from the relay in order to perform the
wiring verification tests, it should be ensured that all connections are replace in accordance
with the relevant external connection or scheme diagram.
If a MMLG test block is installed, remove the MMLB01 test plug and replace the MMLG
cover so that the protection is put into service.
Ensure that all event, fault and disturbance records, alarm and LEDs have been reset before
leaving the relay.
For
MiCOM P123
, if the relay is in a new installation or the circuit breaker has been just
maintained, the circuit breaker maintenance and current counters should be zero. These
counters can be reset using command in RECORD/CB Monitoring menu (refer to User
Guide).
Summary of Contents for MiCom P120
Page 1: ...MiCOM P120 P121 P122 P123 Overcurrent Relays Version 11 Technical Guide P12X EN T A96...
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Page 4: ...P12x EN T A96 Technical Guide Contents Page 2 2 MiCOM P120 P121 P122 P123 BLANK PAGE...
Page 13: ...Introduction P12x EN IT A96 MiCOM P120 P121 P122 P123 INTRODUCTION...
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Page 16: ...P12x EN IT A96 Introduction Page 2 8 MiCOM P120 P121 P122 P123 BLANK PAGE...
Page 22: ...P12x EN IT A96 Introduction Page 8 8 MiCOM P120 P121 P122 P123 BLANK PAGE...
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Page 35: ...User Guide P12x EN FT A96 MiCOM P120 P121 P122 P123 USER GUIDE...
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Page 40: ...P12x EN FT A96 User Guide Page 4 72 MiCOM P120 P121 P122 P123 BLANK PAGE...
Page 108: ...P12x EN FT A96 User Guide Page 72 72 MiCOM P120 P121 P122 P123 BLANK PAGE...
Page 109: ...Menu Content Tables P12x EN HI A96 MiCOM P120 P121 P122 P123 MENU CONTENT TABLES...
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Page 112: ...P12x EN HI A96 Menu Content Tables Page 2 68 MiCOM P120 P121 P122 P123 BLANK PAGE...
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Page 221: ...Application Guide P12x EN AP A96 MiCOM P120 P121 P122 P123 APPLICATION GUIDE...
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Page 370: ...P12x EN CT A96 Communications COURIER DATABASE Page 2 248 MiCOM P120 P121 P122 P123 BLANK PAGE...
Page 514: ...P12x EN CT A96 Communications COURIER DATABASE Page 146 248 MiCOM P120 P121 P122 P123...
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Page 518: ...P12x EN CT A96 Communications IIEC 60870 5 103 Page 2 248 MiCOM P120 P121 P122 P123 BLANK PAGE...
Page 536: ...P12x EN CT A96 Communications IEC 60870 5 103 Page 20 248 MiCOM P120 P121 P122 P123...
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Page 540: ...P12x EN CT A96 Communications DNP 3 0 Database Page 2 248 MiCOM P120 P121 P122 P123 BLANK PAGE...
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Page 573: ...Connection Diagrams P12x EN CO A96 MiCOM P120 P121 P122 P123 CONNECTION DIAGRAMS...
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Page 582: ...P12x EN RS A96 Commissioning Test Record Sheets Page 2 60 MiCOM P120 P121 P122 P123 BLANK PAGE...
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