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Yu B.,Shanghai High Voltage Transmission Co. | Xu B.-H.,Shanghai High Voltage Transmission Co. | Huang J.,Shanghai Ximing Engineering Laboratories | Li X.-Y.,Shanghai Ximing Engineering Laboratories | Tai N.-L.,Shanghai JiaoTong University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper designs a DC monitoring terminal DOG to timely detect DC earthing and DC parasitic circuit through testing the branch differential current and the change of system typology structure. Based on DC monitoring terminal DOG, a distributed DC monitoring system is proposed. The proposed system can be disposed by different styles, which include entire distribution, bottom distribution and the distribution on demand, and it can detect minimum range of DC earthing or DC parasitic circuit quickly. By deploying different alarm colors in different circuits, it is convenient for finding troubles and maintaining. The distributed DC monitoring system is widely used in 220 kV, 110 kV and 35 kV substation and presents good performances. Source

Zhang Q.,Shanghai JiaoTong University | Tai N.,Shanghai JiaoTong University | Yuan C.,Shanghai High Voltage Transmission Co. | Chen K.,Shanghai High Voltage Transmission Co.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

The application of current differential protection on EHV transmission lines is mainly affected by the distributed capacitance current. Such an effect is even more significant in four-parallel lines due to the increased number of circuits and increased amount of mutual distributed capacitance. Based on the ∏ model of transmission lines, this paper proposes to decouple the four-parallel lines capacitance current compensation formula by utilizing the six-sequence component method and presents a time domain solution to compensate the capacitance current on four-parallel lines. Simulation result by PSCAD/EMTDC shows that this new capacitance current compensation scheme can effectively enhance the performance of current differential protection. ©2010 State Grid Electric Power Research Institute Press. Source

Shang J.,Shanghai JiaoTong University | Hu Y.,Shanghai JiaoTong University | Tai N.-L.,Shanghai JiaoTong University | Yuan C.,Shanghai High Voltage Transmission Co. | Cui P.-C.,Shanghai High Voltage Transmission Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

This paper takes auxiliary system of Shanghai 500 kV underground substation as prototype and analyzes the technical points encountered in the design of its DTS. Considering the complicated structure of auxiliary system and more measurement points, a method which simulates the characteristics of the system from outside is proposed. It builds the model through equipment model and relationship model. On this basis, the fault model is classified into two types: status fault and analog exception. Since the auxiliary backstage monitor system is complicated, a screen drawing method which separates the front view from background view is applied, which greatly reduces the workload of monitor system simulation. The results in this paper have important reference value for the design of DTS of other domestic underground substation auxiliary systems. Source

Chen A.,Shanghai JiaoTong University | Tai N.,Shanghai JiaoTong University | Hu Y.,Shanghai JiaoTong University | Yuan C.,Shanghai High Voltage Transmission Co. | Sheng H.,Shanghai High Voltage Transmission Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2012

Because of its distinctiveness, the model of auxiliary equipment is divided into physical model and behavioral model. The behavioral model is further divided into mathematical module, action module, data module and data interface. The realization of each module is analyzed in details. The math module, action module and data interface are based on the data module and independent of each other, which makes the system extremely versatile and scalable. With the consideration of underground substation construction and auxiliary equipment distribution, as well as the time response of system, the dynamic loading/unloading of auxiliary equipment models is carried out once per layer, which saves the processing time and system hardware resources because only the models of one layer are treated at a time. The system can run independently, and also exchange data with two-dimensional simulation platform or online SCADA system. Operational results show that, based on its completeness, the simulative training system runs smoothly with fast response and realistic effect. Source

Liu Q.,Shanghai JiaoTong University | Cheng C.,Shanghai High Voltage Transmission Co. | Wu J.,Shanghai High Voltage Transmission Co. | Hu Y.,Shanghai JiaoTong University | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

The temperature of the equipment can significantly affect the working conditions of the equipment in substation. A kind of substation temperature monitoring system based on ZigBee wireless technology is proposed to solve the drawbacks of the traditional methods. Star-topology ZigBee wireless network is used in the system and SVG is adopted to realize the real-time monitoring based on B/S structure. The design of the temperature monitoring system considers the generality of the data model and the portability of the monitoring platform, which provides a reference for the design of online monitoring of the substation temperature. Source

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