MiCOM P921/P922/P923 - Schneider - error

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P92x/EN GS/F22Page 8/22Getting StartedMiCOM P921/P922/P9236. INTRODUCTION TO THE MiCOM P921-P922-P923 RELAYSThe range of MiCOM protection relays follows on from the success of the MIDOS, K andMODN ranges by incorporating the last changes in digital technology. The relays MiCOMP921-P922 and P923 are fully compatible and use the same modular box concept. TheMiCOM P921-P922 and P923 of relays provides more protection for the most demandingapplications.Each relay has a large number of functions for controlling and collecting data. This can formpart of a fully integrated system covering protection, control, instrumentation, data acquisitionand the recording of faults, events and disturbances. The relays are equipped on the frontpanel with a liquid crystal display (LCD) with 2 x 16 back-lit alphanumerical characters, atactile 7 button keypad (to gain access to all the parameters, alarms and measurements) and8 LEDs simply displaying the state of the MiCOM P921-P922 and P923 relays. In addition,the use of the RS485 communication port makes it possible to read, reinitialise and changethe settings of the relays, if required, from a local or remote PC computer equipped withappropriate software.Its flexibility of use, reduced maintenance requirements and ease of integration allow theMiCOM P921-P922 and P923 to provide an evolving solution for the problems of theprotection of electric networks.The MiCOM P921-P922 and P923 relays provide comprehensive voltage and frequencyprotection for phase and ground faults together with measurements, control and recordingfacilities.Functions MiCOM P921 MiCOM P922 MiCOM P923Protection functionsUnder voltage (27) X X XOver voltage (59) X X XResidual over voltage (59N) X X XNegative sequence overvoltage (47) X XPositive sequence undervoltage (27D) X XUnder frequency (81U) X XOver frequency (81O) X XRate of change of frequency (81R)XUndervoltage blocking (settable for P923) X XAncillary functionsSettings groups 1 2 2Measurements X X XCircuit Breaker Control X X XCircuit Breaker Supervision X XOutput relay latching X X XBlocking logic X X XProgrammable logic equations X X XPeak demand X XRolling demand X XFault record X XEvents records X XDisturbance recording X XRear communication port X X XFront communication port X X XFrequency disturbance recordingX
Getting StartedP92x/EN GS/F22MiCOM P921/P922/P923 Page 9/227. RELAY FRONT DESCRIPTION7.1 Front viewThe front panel of the relay is shown in figure 1, with the hinged covers at the top and bottomof the relay shown closed. Extra physical protection for the front panel can be provided by anoptional transparent front cover. This allows read access only to the relay’s settings and databut does not affect the relay’s IP rating. When full access to the relay keypad is required, forediting the settings, the transparent cover can be unclipped and removed when the top andbottom covers are open.Note that the MiCOM P921-P922 and P923 have the same size and the same front panel.P0385ENbFIGURE 1: RELAY FRONT VIEWThe front panel of the relay includes the following, as indicated in Figure 1:• a 16-character by 2-line alphanumeric liquid crystal display (LCD).• a 7-key keypad comprising 4 arrow keys (, , , , an enter key , a clear key, and a read key ).• 8 LEDs; 4 fixed function LEDs and 4 programmable function LEDs on the left handside of the front panel.• Under the top hinged cover:−The relay serial number, and the relay’s voltage rating information (see figure 3 inthis chapter).• Under the bottom hinged cover:−Battery compartment (holds a ½ AA size battery which s used for memory backupfor event, fault and disturbance records (P922 and P923 phase 1 only), notused in phase 2.
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