外文中英文翻译外文文献英文文献中英对照基于继电保护的电力系统监控设备.doc

Power System Monitoring and Control Facilities on Protective Relays Abstract: It is now possible to consider integrating the functions of the power system protection systems with those of the local and remote data collection and control systems. A structured approach to this integration is necessary. However, if the full benefits are to be realized. A solution which will solve many of the problems previously associated with this integration is presented together with an example of how it might in future be applied in a typical substation. Keywords: Digital communications, Integration 1. Introduction The current practice in power system transmission and distribution environments is to separate the functions of the local control, protection and supervisory control and data acquisition (SCADA) systems. One reason for this has been the technical constraint that has limited the amount of integration which can be reliably achieved. Local control facilities have consisted of hardwired panels taking up much control room space. Control logic has been provided by hardwired contacts or programmable logic controllers. Until recently much of the protection equipment has consisted of analogue devices, again taking up much space. Most modern protection devices using electronic and microprocessor technologies have so far concentrated on reducing the space taken to implement traditional protection functions. Generally, SCADA systems have been added more recently and have supplied their own transducers, interface units and wiring. These have grown up in parallel with the local control and protection systems despite the fact that this often resulted in much functional duplication. Where information concerning the protection operation has been required by the SCADA system this has been derived in a secondary fashion, for example, feeding the protection outputs back into SCADA digital input units. Recent technology advances have led to the realization that this degree of duplic