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9692 Main transformer differential protection relay

 
The protection device is mainly used for differential protection of two winding main transformer, but if needed the three winding main transformer differential protection relay, you can choose the 9693 three winding main transformer differential protection relay of our company.

protection functions
      Differential current instantaneous trip protection
      Percentage differential protection (with second harmonic restraint, CT line-break locking)
      CT line-break alarm
      Y/△ turn on
      Non-electric protection
      slight gas protection – alarm
      severe gas protection- tripping operation
      Load slight gas protection-alarm
      Load  severe gas protection- tripping operation
      Pressure release (turn on- tripping operation; turn off- alarm)
      Temperature rise-alarm
      Over temperature- tripping operation
 
Functions of measurement and control
      High voltage current: IA、IB、IC;
      Low voltage current: Ia、Ib、Ic;
      Differential current: DIa、DIb、DIc;
 
Assistant functions:
      Fault recording
 
Communication mode
      485 communication
      Ethernet communication
      Fiber-optic communication
Protection Principle:
      Pilot differential current instantaneous trip protection
      Pilot differential current instantaneous trip protection is substantially reflected current difference on both sides of the transformer and makes quick action, to ensure to make quick action to get tripping operation, when the internal transformer has significant failure or external transformer on both sides between the CT happen short circuit.
Criterion of protective action: Icd>Isd
      Icd is the actual differential current between the two sides of the same phase between CT, and the Isd is the setting value of the differential current instantaneous trip protection
      Any one phase of the three phases satisfies Icd > Isd, differential protection means protector action exit jumps to all switches of main transformer.
      In actual operation differential current = Ih * cosφ1 + IL*KLjx*cosφ2  
      In that formula,  KLjx(low voltage side unbalance coefficient)= Ie2h(high voltage side twice rated current)/ Ie2l(low 
voltage side twice rated current)
      cosφ1 is the real angle of high voltage side;cosφ2 is the real angle of low voltage side. 





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