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Ren X.-X.,Xian power Supply Company | Luo S.-B.,Henan University of Science and Technology | Ma S.-F.,China Coal Pingshuo Coal Co. | Yun B.-J.,Xian Xirui Protection and Control Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

Because practical transmission systems and fault situations are rather complex, non-unit transient based protection of transmission line is difficult to reliably protect the whole line. On the basis of illustrating the principle of non-unit transient based protection, according to the characteristic that the transmitting modes of the traveling waves generated by the same fault type in transmission line are similar, the method to improve internal-fault right discriminating rate of non-unit transient based protection is presented, which is that making sure forward external faults are reliable non-operation and set respectively in terms of fault types. And the ATP simulation tests of 500 kV EHV transmission system are conducted. The results show that the new method is able to improve the internal-fault right discriminating rate of non-unit transient based protection effectively. Source


Chen H.-D.,Ningxia Electrical Power Company | Yun B.-J.,Xian Xirui Protection and Control Co. | Dai W.-Z.,Ningxia Electrical Power Company | Wang S.-B.,Ningdong Power Supply Bureau | Chen X.-J.,Ningxia Electrical Power Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

In the traditional 10 kV switch substation, the inlet and outlet current protection are difficult to cooperate, thus this paper proposes that the outlet fault locks the inlet protection based on GOOSE. For the inlet protection, the GOOSE based inlet backup power switchover units are integrated into busbar backup power switchover units, and it does not need exclusive backup power switchover units, which saves equipment investment. The function of automatic sequence load shedding through distributed GOOSE information is added to the inlet protection. The method of outlet fault locking inlet protection, network backup power switchover units and automatic sequence load shedding are all applied in the field. The networked backup power switchover units and automatic sequence load shedding have achieved good results. Source


Zou G.,Shandong University | Wang X.,Yantai Longyuan Power Technology Co. | Gao H.,Shandong University | Yun B.,Xian Xirui Protection and Control Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2010

A busbar protection scheme with distributed calculation and local control is proposed for digital substation based on IEC61850. Its overall configuration without master station is constructed according to the technical characteristics of digital substation. The data transmission characteristics of samples and GOOSE are analyzed and the process bus which connects the devices of process layer and the protection equipment of bay layer is designed based on Ethernet technology. The principle of instantaneous current differential protection is applied in the calculation of distributed busbar protection, which takes the advantage of unsaturated current transducer. Analysis shows that the proposed scheme has simple structure, high reliability and feasibility. Source


Zheng F.,Xian University of Science and Technology | Lu J.-T.,China Coal Xian Design Engineering Co. | Gao L.,Xian Power Supply Bureau | Yun B.-J.,Xian Xirui Protection and Control Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper designs a scheme of redundant network communication based on IEC60870-5-103 transmission protocol and embedded ucLinux platform, which is applied to microcomputer-based relay protection devices. The scheme adopts a pair of Ethernet ports, one of which is the other's standby in hardware design, and makes use of socket programming in Linux system and data sharing or backup to achieve redundant network communication aiming at several host computers in software design. The basic application function of protocol 103 is analyzed, and aiming at the special problem about the application function in redundant network communication, the solutions to the practice of application function are proposed. The application in protection devices indicates that the scheme can improve the reliability of communication. Source


Zhao Y.,Shaanxi Electrical Power Maintenance Company | Yun B.,Xian Xirui Protection and Control Co. | Zheng F.,Xian Xirui Protection and Control Co. | Li L.,Xian University of Science and Technology | And 2 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2014

The principle of synchronous closing technique is discussed by example of synchronous closing capacitor in this paper. How to forecast the closing time accurately is the key point of the synchronous closing technology system. The factors that influence moving time of permanent magnetic actuator have been analyzed. The algorithm that forecasts moving time of permanent magnetic actuator by using least-square has been presented and the mathematical model is built to predict the closing time. The result of experiment shows that least-square with forecasting the closing time is practicable. Source

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