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P72x/EN CM/C21
Commissioning and Maintenance
Page 20/28
MiCOM P721/P723
FIGURE 5: REF - PRIMARY INJECTION - STABILITY TEST SET UP
During the stability test, it is necessary to measure the spill current in the relay circuit,
therefore the stabilizing resistor should be shorted out. The current should be increased up
to as near full load as possible and the current flowing through ammeter A1 noted. If the
connections are correct, this current would be very low, only a few milliamps. A high reading,
(twice the injected current, referred through the current transformer ratio) indicates that one
of the current transformer connections is reversed. This test should be repeated for the
B-phase CT and neutral CT, and then for the C-phase CT and neutral CT.
The sensitivity of the protection can be checked by injecting with the single phase test set
through each of the main current transformers in turn. This is shown in Figure 6. While
carrying out this test it is advisable to measure the voltage across the relay coil and
stabilizing resistance, and so to check the approximate voltage developed by the main
current transformer to cause relay operation. During this test the P79x auxiliary relay should
be kept energized, thus the stabilizing resistor is not short circuited.
FIGURE 6: REF/BEF - PRIMARY INJECTION - SENSITIVITY TEST SET UP
Содержание P721
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Страница 5: ...Pxxx EN SS G11 SAFETY SECTION...
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Страница 15: ...Introduction P72x EN IT C21 MiCOM P721 P723 INTRODUCTION...
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Страница 39: ...User Guide P72x EN FT C21 MiCOM P721 P723 USER GUIDE...
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Страница 79: ...Menu Content Tables P72x EN HI C21 MiCOM P721 P723 MENU CONTENT TABLES...
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Страница 89: ...Technical Data P72x EN TD A11 MiCOM P721 P723 TECHNICAL DATA...
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Страница 109: ...Getting Started P72x EN GS C21 MiCOM P721 P723 GETTING STARTED...
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Страница 135: ...Application Guide P12x EN AP C21 MiCOM P721 P723 APPLICATION GUIDE...
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Страница 189: ...Communication database P72x EN CT A11 MiCOM P721 P723 COMMUNICATION DATABASE...
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Страница 191: ...Communication database P72x EN CT A11 MiCOM P721 P723 MODBUS DATABASE MiCOM P721 P723 VERSION V11...
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Страница 253: ...Communication database P72x EN CT A11 MiCOM P721 P723 DNP 3 0 DATABASE MiCOM P721 P723 VERSION V11...
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Страница 269: ...Commissioning and Maintenance P72x EN CM C21 MiCOM P721 P723 COMMISSIONING AND MAINTENANCE GUIDE...
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Страница 299: ...Connection Diagrams P72x EN CO A11 MiCOM P721 P723 CONNECTION DIAGRAMS...
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Страница 303: ...Commissioning Test Record Sheets P72x EN RS A11 MiCOM P721 P723 COMMISSIONING TEST RECORD SHEETS...
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