A number of microprocessor-based digital devices with communication capabilities have been manufactured for traction power substations. These devices include protective relays, fault recorders, and metering units. One such device is the SIEMENS SITRAS DPU96 relay that provides overcurrent and rate-of-rise protection for faults on DC traction power distribution system. To fully utilise this digital technology, PLC (Programmable Logic Controller) was the best mean of collecting and organising data from these devices locally at the traction power substation and also provide easy interface. PLC was also used for high rail-to-earth potential monitoring and protection. The trip characteristics of this relay require adjustability over the voltage ranges normally from 40V DC to 160Vdc and time-delay range from 10ms to 3 seconds which can be easily accomplished with PLC programming. This paper describes the applications of digital relays, human machine interface, and PLC in a traction power substation. The PLC minimises wiring, saves space, is flexible, reliable and allows easy troubleshooting with online capabilities.
Traction power substation protection & controls using programmable logic controllers
2007
8 Seiten, 8 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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