RESEARCH AND APPLICATION OF PROTECTION TECHNOLOGY

Traditionally, for 300MW generator unit, only differential protection of main transformer, generator and generator-transformer unit are doubled. The rest is of single arrangement. But some fault type can only be protected by one dedicated protection element, when the dedicated protection is out of operation because of failure of wiring or device itself, the generator has to be stopped or run with defects, thus the loss and risks are high.

RCS-985 series protection integrates all electric quantities protection for one generator-transformer unit together, i.e. main protection, backup protection and abnormal operation protection. The protected range includes main transformer, generator, high-voltage house-service transformer and exciting transformer or field exciter. For large generator-transformer unit, double protection devices are needed, each has its’ own TAs and independent trip outputs.

This arrangement results in convenience of operation, setting, testing and maintenance, high security and reliability, simple design and clear wiring. Main protection and backup protection share the same TAs, so the total number of TAs needed is the same as or less a little than before.

7.  Prospect

The first group of generators in Three-Gorge hydraulic power plant has passed acceptance test and put into service. The structure of linked networks spanning large area is coming into being in China. More higher voltage level 750kV network will soon appear in northwest China. Fast developing electric power industry in China offers wide scope of activities for research and application on protection. NARI-RELAYS will continue to explore and innovate in electric power protection and automation area, and contribute her efforts to the development of protection technology.

Reference

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2 Shen Guorong. RESEARCH ON PRINCIPLE OF DPFC DISTANCE RELAY. Presented on the 4th session of relaying protection and safety devices CSEE. 1986.

3 Shen Guorong, Li Kang, Zhu Shengshi, Deng Shaolong. ULTRA HIGH SPEED DIRECTIONAL COMPARISON PROTECTION- JKF-1. AUTOMATION OF ELECTRIC POWER SYSTEMS. 1987,11(3).

4 Shen Guorong. Deng Shaolong, Zhu Shengshi. THE NEW PRINCIPLE OF DISCRIMINATION BETWEEN POWER SWING AND SHORT CIRCUIT. AUTOMATION OF ELECTRIC POWER SYSTEMS.1990,14(1).

5 Shen Guorong, Sui Fenghai, Chen Tao, Ye Feng. EHV LINE FAST PROTECTION RELAY LFP-901. AUTOMATION OF ELECTRIC POWER SYSTEMS, 1993，17(6).

6 Shen Quanrong，Zheng Yuping，Zhu Zhenfei。DYNAMIC SIMULATION AND COMPARISON OF SEVERAL PROTECTION SCHEMES FOR GENERATOR INTERNAL FAULT. AUTOMATION OF ELECTRIC POWER SYSTEMS.1999,23(11).

7 Shen Guorong, Zheng Yuping, Dai Xuean, Peng Huanong. PERFORMANCES OF LFP-901A AND LFP-902A DIGITAL PROTECTION RELAYS IN SOME SPECIAL FAULTS. AUTOMATION OF ELECTRIC POWER SYSTEMS.1999,23(14).

8 Zheng Yuping, Li Yuanyuan, Zhang Shaochun. PERFORMANCE OF DIRECTIONAL RELAY ON SERIES CAPACITOR COMPENSATED PARALLEL DOUBLE-CIRCUIT LINES. AUTOMATION OF ELECTRIC POWER SYSTEMS.1999,23(22).

9 Li Li, Lu Hang, Sheng Guorong, Zheng Yuping. LFP-915 DIGITAL BUSBAR PROTECTION SET. AUTOMATION OF ELECTRIC POWER SYSTEMS.2000,24(1).

10 Ye Yuanbo. RESEARCH ON APPROACH OF USING LFP-901/902 MICROCOMPUTER-BASED LINE PROTECTION ON SERIES CAPACITOR COMPENSATED LINES. AUTOMATION OF ELECTRIC POWER SYSTEMS.2000,24(10).

11 Chen Songlin, Li Haiying, Qiao Yong, Zheng Yuping, Shen Guorong. RCS-978 DIGITAL TRANSFORMER PROTECTION SET. AUTOMATION OF ELECTRIC POWER SYSTEMS.2000,24(22).

12 You Danfeng, He Xuefeng, Li Li, Lin Xiaodong. RCS-915 DIGITAL BUS AND BREAKER FAIL PROTECTION INTEGRATION AND ITS DUPLEX SCHEME. AUTOMATION OF ELECTRIC POWER SYSTEMS.2001,25(21).

13 Shen Quanrong,Zheng Yuping, Hu Bin, Zhou Luming, Chen Gongquan, Song Shunyi, Wang Ypuming, Hua Yu. RELAY OPERATION ANALYSIS IN INTERNAL FAULT OF MAWAN 300MW GENERATOR-TRANSFORMER UNIT. AUTOMATION OF ELECTRIC POWER SYSTEMS.2001,25(23).

14  Li Yuanyuan, Zheng Yuping, Shen Guorong. INFLUENCE OF SERIES CAPACITOR ON INCREMENTAL POWER FREQUENCY DISTANCE RELAY. AUTOMATION OF ELECTRIC POWER SYSTEMS.2001,25(24).

15 Shen Quanrong, He Xuefeng, Shen Jian, Yan Wei, Zheng Yuping, Shen Guorong, DISCUSSION OF THE LARGE GENERATOR- TRANSFORMER UNIT REDUDANT SETS OF PROTECTION SCHEME. AUTOMATION OF ELECTRIC POWER SYSTEMS. 2002,26(10).

16 Chen Songlin, Zheng Yuping, Shen Guorong, Li Jiuhu. THE DUPLICATE PROTECTION DISPOSITION OF ULTRA-HIGH VOLTAGE AND LARGE CAPACITY TRANSFOMER. JIANGSU ELECTRICAL ENGINEER. 2003,22(3).转贴于 酷文网-论文下载中心 http://www.coolwen.net