MiCOM P921/P922/P923 - Schneider - error

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P92x/EN CM/F22Page 2/26Commissioning GuideMiCOM P921/P922/P9235.3 Testing the "Phase overvoltage protection" and "Phase undervoltage protection"functions 155.3.1 Wiring diagram 155.3.2 MiCOM P921-P922-P923 relay parameters 165.3.3 Configuration with 3 single voltages (“3Vpn”) and “AND” detection logic 175.3.3.1 Stages (V>) or (V) or (V) or (f1) AND (V>>) STAGE TEST 15
Commissioning GuideP92x/EN CM/F22MiCOM P921/P922/P923 Page 3/261. INTRODUCTIONThe MiCOM P921-P922-P923 protection relays are fully numerical in their design,implementing many protection and non-protection functions. The relays periodically conductself-checking and, in the unlikely event of a failure, will trigger an alarm. As a result of this,the commissioning tests do not need to be as extensive as with non-numeric electronic orelectro-mechanical relays.To commission numeric relays, it is only necessary to verify that the hardware is functioningcorrectly and the application-specific software settings have been applied to the relay. It isconsidered unnecessary to test every function of the relay if the settings have been verifiedby one of the following methods:• Extracting the settings applied to the MiCOM relay using appropriate setting software(Preferred method)• Via the operator interfaceTo confirm that the product is operating correctly once the application-specific settings havebeen applied, a test should be performed on a single protection element.Unless previously agreed to the contrary, the customer will be responsible for determiningthe application-specific settings to be applied to the relay.Blank commissioning test and setting records are provided in chapterP92x/EN RS for completion as required.The commissioning tests must always be performed in conformity with the rules andregulations of the country of use.Before carrying out any work on the equipment the user should be familiar with the contentsof the Safety Section/Safety Guide SFTY/4LM/D11 or later issue and the ratings on theequipment’s rating label.
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