Sepam - HV/MV Protection and control units (ENG) - Trinet

ApplicationThis function provides relaying of the monitoringdevices for the different sorts of transformers:c sealed, liquid-filled transformers, relaying of theDGPT2 (Detection of Gas, Pressure, Temperature)outputs,c expansion-tank transformers with conservator,relaying of the thermostat and Buchholz outputs,c dry coated transformers, relaying of the PTC sensoroutputs and sensor box auxiliary voltage controlmechanism.It is used in transformer applications, and in generatorapplications protecting generator-transformer units(G00, G15 and G16 types).The block diagram above indicates the role of each ofthe inputs assigned to the different monitoring devices:c tripping of the breaking device linked to the Sepam,c inhibition of closing; inhibition is active as long as thefault is stored,c storage of the fault (lockout); if the fault hasdisappeared, acknowledgement is required todeactivate storage and enable a closing order to betransmitted; the user acknowledges by pressing thereset key or via the communication link,c activation of the alarm annunciation output (O11),c activation of the fault tripping annunciationoutput (O12),c activation of the intertripping output (O23); thisoutput is used to give a tripping order to otherSepam2000 (upstream or downstream from thetransformer).Input I23 to I28 logic may be set up via pocket terminal contact KP5.logicnormally open contact tripping or alarm if Ixx = 1 0normally closed contact tripping or alarm if Ixx = 0 1with Ixx: I23 i Ixx i I28KP5 = 0 by default, KP35 = 0 by defaultKP5 (KP35 forG00, G15 and G16)The role of input I23 linked to DGPT2 gas detection or level drop may be setvia pocket terminal contact KP6. This input may be linked to a tripping or analarm action.logic KP6 (KP36 for G00)input I23 tripping 0input I23 alarm 1The following chart indicates, for each of the inputs:c the message that appears on the display unit (the TRIP led goes ON if the relatedfault causes tripping),c remote indication (KTS) transmitted by the communication link.input description display message remote indicationI22 PTC sensor box auxiliary voltage monitoring PTC FAULT KTS30I23 DGP: level drop or gas detector TR. GAS KTS30trip LED on if trip (KP6 = 0)I24 DGP: pressure detector TR PRESSURE KTS31trip LED onI25 thermostat or PTC sensors: alarm TR. TEMP. KTS28 (KTS29 for G00 type)I26 thermostat or PTC sensors: tripping TR. TEMP. KTS29 (KTS32 for G00 type)trip LED ontransformer sensors : alarm TX AL/TRIP KTS33(G15, G16 type only)I27 Buchholz alarm BUCHHOLZ KTS30transformer sensors : tripping TX AL/TRIP KTS34(G15, G16 types only)I28 Buchholz tripping BUCHHOLZ KTS31trip LED onchecking of the PTC sensor box auxiliary voltage PTC OVERTEM KTS31(G15, G16 types only)Commissioningc Connect the monitoring device outputs to the corresponding Sepam 2000 inputs.c Set KP5 to 1 if the monitoring device outputs are normally closed contacts (KP35for G00, G15 and G16 types).c Set KP6 to 1 if DGPT gas detection should only trigger an alarm, rather thantripping (KP36 for G00 type).KP5, KP6, KP35 and KP6 may be accessed via the pocket terminal(parameter heading in the control logic menu).Control and monitoring functions1/25