987S transmission line distance protection relay
987S transmission line distance protection relay adopts High performance micro controller STM32F103VET6 chip, based on ARM Cortex-M3 kernel; it integrates 32 digits RISC processor, low power consumption, high performance analog technology, high speed DMA channel and rich in chip set, and JTAG simulation debugging; No Adjustable device, Site maintenance free, and main protection and backup protection for transmission lines with voltage classes of 220kV and above.
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
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
44）4 group constant value
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 flexible interface. 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.
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