MiCOM P921/P922/P923 - Schneider - error

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P92x/EN CM/F22Page 6/26Commissioning GuideMiCOM P921/P922/P9234. PRODUCT CHECKSThese product checks cover all aspects of the relay which should be checked to ensure thatit has not been physically damaged prior to commissioning, is functioning correctly and allinput quantity measurements are within the stated tolerances.If the application-specific settings have been downloaded to the relay prior to commissioning,it is advisable to make a copy of the settings so as to allow their restoration later. To do thisuse one of the methods described below:• Obtain a setting file on a diskette from the customer (this requires a portable PC withappropriate setting software, e.g. MiCOM S1).• Extract the settings from the relay itself (this again requires a portable PC withappropriate setting software).• Manually create a setting record. This can be done using a copy of the setting recordlocated in chapter P92x/EN RS to record the settings as the relay’s menu issequentially stepped through via the front panel user interface.If password protection is enabled and the customer has changed the password to preventchanges to some of the settings, either the revised password should be provided, or thecustomer should restore the original password prior to commencement of testing.NOTE:In the event that the password has been lost, a recovery passwordcan be obtained from AREVA by quoting the serial number of therelay.4.1 With the relay de-energisedTHE FOLLOWING GROUP OF TESTS SHOULD BE CARRIED OUT WITHOUT THEAUXILIARY SUPPLY CONNECTED TO THE RELAY AND WITH THE TRIP CIRCUITISOLATED.The voltage transformer connections must be isolated from the relay for these checks. If anMMLG test block is provided, the required isolation can easily be achieved by inserting testplug type MMLB01 which effectively open-circuits all wiring routed through the test block.Before inserting the test plug, reference should be made to the scheme (wiring) diagram toensure that this will not potentially cause damage or a safety hazard.If a test block is not provided, the voltage transformer supply to the relay should be isolatedby means of the panel links or connecting blocks. Where means of isolating the auxiliarysupply and trip circuit (e.g. isolation links, fuses, MCB, etc.) are provided, these should beused. If this is not possible, the wiring to these circuits will have to be disconnected and theexposed ends suitably terminated to prevent them from being a safety hazard.
Commissioning GuideP92x/EN CM/F22MiCOM P921/P922/P923 Page 7/264.1.1 Visual inspectionCarefully examine the relay to see that no physical damage has occurred since installation.The rating information given under the top cover on the front of the relay should be checkedto ensure it is correct for the particular installation.Ensure that the case protective conductor terminal upper right-hand corner at the rear of therelay case, is used to connect the relay to a local earth bar using an adequate conductor,minimum size 1.5mm 2 .P0386XXa4.1.2 InsulationFIGURE 1: REAR TERMINAL BLOCKS ON SIZE 20TE CASEInsulation resistance tests are only necessary during commissioning if it is required for themto be done and they haven’t been performed during installation.Isolate all wiring from the earth and test the insulation with an electronic insulation tester at aDC voltage not exceeding 500V. Terminals of the same circuits should be temporarilyconnected together.The main groups of relay terminals are:a) Voltage transformer circuits.b) Auxiliary voltage supply.c) External voltage output and opto-isolated inputs.d) Relay contacts.e) RS485 communication port.f) Case earth.The insulation resistance should be greater than 100MΩ at 500V.4.1.3 On completion of the insulation resistance tests, ensure all external wiring is correctlyreconnected to the relay.
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MiCOM P921/P922/P923 - Schneider - error

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