Study On The Grounding Method Of Power Auxiliary System And Of Anti-Jamming

The power auxiliary system is part and parcel of power system, including: the equipment of protection system, the cable loop of auxiliary system, Supervisory Control and Data Acquisition (SCADA) system, etc. The technology of microprocessors and computers is very important and widely used in relay protection and SCADA system. But , because of the complexity of the controlling cable and signal cable in power plant and substation , and of the complexity of the surroundings , the equipment used in protection or SCADA system is very easy to be interfered . So, it is quite important how to do to anti-jamming.The technique of grounding argued about for a long time is only limit of the technique common in order to protect, improve system protection and reliability and provides safety to people standing by. With the widely used of microprocessors and computers, grounding technique is more important and making progress as one effective way of anti-jamming.In the course of installing and testing system protection and reliability, I found that the way of grounding about the CT and PT cable loop. And, there is no the same rule of way of grounding about the shield of controlling cable.In this thesis, the cause of disturbance and the effect on the power auxiliary system are analyzed. A series of ways of grounding of the power auxiliary system are summarized and analyzed compared and then conclusions are written at the end of the thesis.The work including:(1). A survey and a comparative analysis of electric disturbance and its transmitting way are introduced(2). The consist of micro-computer protection is summarized from hardware and software. The anti-jamming way of SCADA is explored and analyzed.(3). The grounding way of power auxiliary system and the measures of anti-jamming are explored and analyzed.