987S transmission line distance protection relay

 
Main functions of distance protection relay:
           1）power frequency variation protection
           2）Earthing-fault distance current instantaneous trip protection
           3）Earthing-fault distance-time delay current instantaneous trip protection
           4）Earthing-fault distance definite time over-current protection.
           5）Phase spacing current instantaneous trip protection
           6）Phase spacing time delay current instantaneous trip protection
           7）Phase spacing definite time over-current protection.
           8）Acceleration protection after distance-time delay current instantaneous trip protection
           9）Acceleration protection after definite time over-current protection.
           10）Asymmetric trip acceleration 
           11）Double circuit trip acceleration 
           12）current instantaneous trip protection
           13）time delay current instantaneous trip protection
           14）definite time over-current protection.
           15）Over current protection
           16）Low voltage locking over current protection
           17）Acceleration protection after over current  
           18）Zero sequence current instantaneous trip protection
           19）Zero sequence current instantaneous trip protection with direction 
           20）Zero sequence time delay current instantaneous trip protection
           21）Zero sequence time delay current instantaneous trip protection with direction
           22）Zero Sequence definite time over-current protection.
           23）Zero Sequence definite time over-current protection with direction
           24）Zero-Sequence voltage locking protection 
           25）Acceleration protection after zero-Sequence
           26）Low cycle load reduction current instantaneous trip protection
           27）Low cycle load reduction time delay current instantaneous trip protection
           28）Low voltage locking Low cycle load reduction
           29）Low current locking Low cycle load reduction
           30）Low voltage load shedding
           31）Non voltage locking low voltage load shedding
           32）sliding voltage locking low voltage load shedding
           33）TV line-break locking alarm
           34）TV no voltage 
           35）reclosure
           36）reclosure test no voltage
           37）reclosure test at the same time
           38）Manual closing / remote control closing test no voltage
           39）Manual closing / remote control closing test at the same time
           40）Circuit breaker failure
           41）Control circuit break alarm
           42）Trip operation acceleration
           43）Overload protection
           44）4 group constant value 
           45）Fault recording
           46）telecontrol: normal circuit breaker to remote control separate brake and closing; Distance changes device parameters, fixed value, control word, soft pressing plate and fixed value code, etc.
           47）telemetering: current, voltage, frequency and so on
           48）telesignalisation: All kinds of protective function signals, circuit breaker position digital input and digital output signal, and impulse electric degree. This distance could help relay to protect many things like distance protection, pilot protection, transformer protection, and so on. The above just list some common distance main protection and back-up protection.
 
The functions of distance protection relay communication:
 
           It could communicate with local monitoring directly. The device supports RS485 communication and Ethernet communication methods can be based on the actual requirements of the site to choose the use of a flexible interface. The communication protocol can adopt IEC60870-5-103、MODBUS.
 
           Communication parameters:  10/100M Ethernet; RS485, A start bit, 8 bits of data, a stop bit, no parity check, Baud rate range: 1200-57600 bps.