Commissioning P44x/EN
CM/E33
MiCOM P441/P442 & P444
Page 41/54
6.2 Current
Connections
Measure the current transformer secondary values for each using a multimeter connected in
series with corresponding relay current input.
Check that the current transformer polarities are correct by measuring the phase angle
between the current and voltage, either against a phase meter already installed on site and
known to be correct or by determining the direction of power flow by contacting the system
control centre.
Ensure the current flowing in the neutral circuit of the current transformers is negligible.
Compare the values of the secondary phase currents and phase angle with the relay’s
measured values, which can be found in the MEASUREMENTS 1 menu column.
NOTE:
Under normal load conditions the earth fault function will measure
little, if any, current. It is therefore necessary to simulate a phase to
neutral fault. This can be achieved by temporarily disconnecting one
or two of the line current transformer connections to the relay and
shorting the terminals of these current transformer secondary
windings.
If cell [0D02: MEASURE’T SETUP, Local Values] is set to ‘Secondary’, the currents
displayed on the relay should be equal to the applied secondary current. The relay values
should be within 1% of the applied secondary currents. However, an additional allowance
must be made for the accuracy of the test equipment being used.
If cell [0D02: MEASURE’T SETUP, Local Values] is set to ‘Secondary’, the currents
displayed on the relay should be equal to the applied secondary current multiplied by the
corresponding current transformer ratio set in ‘VT & CT RATIOS’ menu column. Again the
relay values should be within 1% of the expected value, plus an additional allowance for the
accuracy of the test equipment being used.
Содержание MiCOM P441
Страница 1: ...MiCOM P441 P442 P444 Numerical Distance Protection VC2 x Technical Guide P44x EN T E44...
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Страница 427: ...Installation P44x EN IN E33 MiCOM P441 P442 P444 INSTALLATION...
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Страница 439: ...Commissioning P44x EN CM E33 MiCOM P441 P442 P444 COMMISSIONING...
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Страница 495: ...Commissioning Test Record Sheets P44x EN RS E33 MiCOM P441 P442 P444 COMMISSIONING TEST RECORD SHEETS...
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Страница 521: ...Courrier Data Base P44x EN GC E44 MiCOM P441 P442 P444 CONFIGURATION MAPPING...
Страница 610: ...Courier Data Base P44x EN GC E44 MiCOM P441 P442 P444 DEFAULT PROGRAMMABLE SCHEME LOGIC PSL...
Страница 615: ...Menu Content Tables P44x EN HI E44 MiCOM P441 P442 P444 MENU CONTENT TABLES...
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