P92x/EN CM/E11
Techncal Guide
Commissioning Guide
Page 10/28
MiCOM P921-P922-P923
ab
c
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4.1.6
Auxiliary supply
The relay can be operated from either a DC only or an AC/DC auxiliary supply
depending on the relay’s nominal supply rating. The voltage must be within the
operating range specified in Table 2.
Without energising the relay, measure the auxiliary supply to ensure it is within the
operating range.
Nominal supply rating
DC [AC RMS]
DC operating
range
AC operating
range
24-60V
[-]
19 to 72V
-
48-150V
38 to 180V
-
130-250V
[100/250V]
104 to 300V
88 to 300V
TABLE 2 : OPERATIONAL RANGE OF AUXILIARY SUPPLY
It should be noted that the relay can withstand an AC ripple of up to 12 % of the
upper rated voltage on the DC auxiliary supply.
DO NOT ENERGISE THE RELAY USING THE BATTERY CHARGER WITH THE BATTERY
DISCONNECTED AS THIS CAN IRREPARABLY DAMAGE THE RELAY'S POWER SUPPLY
CIRCUITRY
ENERGISE THE RELAY IF THE AUXILIARY SUPPLY IS WITHIN THE OPERATING RANGE.
IF AN MMLG TEST BLOCK IS PROVIDED, IT MAY BE NECESSARY TO LINK ACROSS
THE FRONT OF THE TEST PLUG TO CONNECT THE AUXILIARY SUPPLY TO THE RELAY.
4.2
With the relay energised
THE FOLLOWING GROUP OF TESTS VERIFY THAT THE RELAY HARDWARE AND
SOFTWARE IS FUNCTIONING CORRECTLY AND SHOULD BE CARRIED OUT WITH
THE AUXILIARY SUPPLY APPLIED TO THE RELAY.
THE VOLTAGE TRANSFORMER CONNECTIONS MUST REMAIN ISOLATED FROM THE
RELAY FOR THESE CHECKS.
4.2.1
Watchdog contacts
Using a continuity tester, check the watchdog contacts are in the states given in Table
1 for an energised relay.
4.2.2
Date and time
Set the date and time to the correct values. Refer to Chapter P92x/EN FT of the
Technical guide.
Summary of Contents for MiCOM P921
Page 1: ...MiCOM P921 P922 P923 Voltage and Frequency Relays Technical guide P92x EN T E11...
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Page 4: ...P92x EN T00 E11 Technical Guide Content Page 2 2 MiCOM P921 P922 P923 BLANK PAGE...
Page 5: ...Technical Guide Px2xx EN SS A11 SAFETY SECTION SAFETY SECTION...
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Page 13: ...Technical Guide P92x EN GS E11 MiCOM P921 P922 P923 aBCD Getting Started...
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Page 33: ...Technical Guide P92x EN CO E11 MiCOM P921 P922 P923 aBCD Connection Diagrams...
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Page 45: ...Technical Guide P92x EN TD E11 MiCOM P921 P922 P923 Technical Data...
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Page 77: ...Technical Guide P92x EN FT E11 MiCOM P921 P922 P923 User Guide...
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Page 258: ...P92x EN CT E11 Technical Guide Courier Database Page 68 118 MiCOM P921 P922 P923 BLANK PAGE...
Page 296: ...P92x EN CT E11 Technical Guide Courier Database Page 106 118 MiCOM P921 P922 P923 BLANK PAGE...
Page 298: ...P92x EN CT E11 Technical Guide IEC 60870 5 103 Page 108 118 MiCOM P921 P922 P923 BLANK PAGE...
Page 308: ...P92x EN CT E11 Technical Guide IEC 60870 5 103 Page 118 118 MiCOM P921 P922 P923 BLANK PAGE...
Page 309: ...Technical Guide P92x EN IN E11 MiCOM P921 P922 P923 abcd Installation...
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Page 319: ...P92x EN IN E11 Technical Guide Installation Page 10 10 MiCOM P921 P922 P923 abcd BLANK PAGE...
Page 320: ...Technical Guide P92x EN CM E11 MiCOM P921 P922 P923 abcd Commissioning Guide...
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Page 351: ...Technical Guide P92x EN RS E11 MiCOM P921 P922 P923 Test Report...
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