P12x/EN T/Eb6 - Schneider - error

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P12x/EN AP/Eb6Page 72/78Application GuideMiCOM P120/P121/P122/P1231 - Case of example No 2:The R1 resistor maximum value (in Ohm) is defined by the following formula:Where:0,8 UR1 2 ×( 1,2 × U )R1a2[ W]The R1 resistor maximum value (in Ohm) is defined by the following formula:Where:0,8 × UR1 2 ×2( 1,2 × Ua)( ) [ W]R1 + RIf the trip contact is latched or temporarily by-passed, the continuous current through thetripping coil is:CoilI CONTINUOUS =(1.2 × Ua)R1 + R COILIf the value is above admissible continuous current through the tripping coil, trip contactlatching must not be made and by-passing trip contact should never be made.
Application GuideP12x/EN AP/Eb6MiCOM P120/P121/P122/P123 Page 73/7828. REAL TIME CLOCK SYNCHRONISATION VIA OPTO-INPUTSIn modern protective schemes it is often desirable to synchronize the relay’s real time clockso that events from different relays can be placed in chronological order. This can be doneusing the communication interface connected to the substation control system or via an optoinput.Any of the available opto-inputs on the P12x relay can be selected for synchronization.Pulsing this input will result in the real time clock snapping to the nearest minute. Therecommended pulse duration is 20ms to be repeated no more than once per minute. Anexample of the time synchronization function is shown.Time of “Sync. Pulse”Corrected Time19:47:00.000 to 19:47:29.999 19:47:00.00019:47:30.000 to 19:47:59.999 19:48:00.000NOTE:The above assumes a time format of hh:mm:ss29. EVENT RECORDSThe relay records and time tags up to 250 events and stores them in a non-volatile (flash)memory. This allows the system operator to analyse the sequence of events that occurredwithin the relay after a particular power system condition, or switching sequence, etc. Whenthe available space is exhausted, the new fault automatically overwrites the oldest fault.The real time clock within the relay times tag each event, with a resolution of 1ms.The user can view event records either via the front panel interface, via the EIA (RS) 232port, or remotely, via the rear EIA (RS) 485 port.30. FAULT RECORDSEach time any of the programmed thresholds are crossed, a fault record is created andstored in memory. The fault record tags up to 25 faults and stores them in a non-volatile(flash) memory. This allows the system operator to identify and analyse network failures.When the available memory space is exhausted, the new fault automatically overwrites theoldest fault.The user can view actual fault record under the RECORD/Fault Record menu, where hecan select to display up to 25 stored records. These records are fault flags, faultmeasurements, etc. Also note that the time stamp displayed in the fault record itself will bemore accurate than the corresponding time stamp given in the event record. This is due tothe fact that events are logged some time after the actual fault record happens.The user can view event records either via the front panel interface, via the EIA (RS) 232port, or remotely, via the rear EIA (RS) 485 port.31. INSTANTANEOUS RECORDEREach time any of programmed thresholds are crossed, an instantaneous record is createdand displayed under the RECORDS/Instantaneous menu. The last five starting informationwith the duration of the information are available.The following information is displayed under the RECORDS/Fault Record menu: number offaults, hour, date, origin (crossing of I>, I>>, I>>> or Ie>, Ie>> or Ie>>> thresholds), durationof the instantaneous, and if the crossing of the threshold lead to a trip or not.
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MiCOMP120/P121/P122/P123Overcurrent
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P12x/EN T/Eb6 - Schneider - error

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