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Digital Protection Relays MV Systems → Transmission Protection Relays → AQ L357 Line Protection Relay

AQ L357 Line Protection Relay

AQ L357-AQ L357 Line Protection Relay

Sipariş No : AQ L357

AQ L357 is a line protection IED with full scheme distance protection for transmission and sub-transmission line protection applications. It integrates a full range of line protection functions along with variety of additional functions for control, measurement, monitoring and communications. The AQ L357 comes in half of 19 inch arrangement and the AQ L397 comes in full 19 inch arrangement allowing for larger quantity of additional IO cards. The functionality is the same in both units.

AQ L357 Line Protection Relay

Protection Function ANSI     Protection Function ANSI
Three-phase instantaneous overcurrent protection - >>>  50     Definite time overvoltage protection - U >, U >> 59
Three-phase time overcurrent protection - I>, I>> 51     Definite time undervoltage protection - U 27
Residual instantaneous overcurrent protection - Io>>> 50N     Residual voltage protection - Uo >, Uo>> 59N
Residual instantaneous overcurrent protection - Io>>> 51N     Overfrequency protection - f >, f >>  81O
Directional three-phase overcurrent protection - IDir>,IDir >> 67     Underfrequency protection - f  81U
Directional residual overcurrent protection - IoDir>,IoDir >> 67N     Rate of change of frequency protection - df/dt 81R
5-zone distance protection, Z< 21     Synchrocheck - SYNC 25
Teleprotection 85     Auto-reclose - 0 -> 1 79
Out-of step 78     Fuse failure - VTS 60
Power swing block 68     Switch onto fault logic  
Inrush detection and blocking - I2h > 68     Breaker failure protection - CBFP 50BF
Current unbalance protection - Iub > 60/46     Distributed busbar protection sub-unit feature - 3IdB> 87B
Thermal protection - T > 49        
 
  • Easy to use multilingual Touch Screen display, Fully coloured MIMIC display
  • 16 freely configurable multi-colour LEDs with user description selectable texts
  • 12 Inputs (16/36 Optional) - 8 Outputs (16/24 Optional)
  • Up to 100 disturbance records and 10 000 events in non-volatile memory
  • Single, dual or redundant IEC 61850 with GOOSE, IEC 101,IEC 103, IEC 104, Modbus, DNP 3.0
  • IED Intercommunication according to IEC 61850/9 (distributed)
  • Less than 20ms trip time

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