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Cui B.,China Electric Power Research Institute | Li Z.,China Electric Power Research Institute | Wang C.,China Electric Power Research Institute | Wu Z.,Xian High Voltage Apparatus Rresearch Institute Co. | And 2 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2014

A method is proposed to improve transfer current switching capacity for bypass disconnectors by setting auxiliary circuit paralleled with main circuit. Because of switching by vacuum circuit breaker in auxiliary circuit, transfer current switching capacity of disconnectors can be improved significantly, and meet the demands of bypass disconnectors used for ultra high voltage (UHV) series compensation. Therefore arc can be enclosed in vacuum interrupters, the influence on external devices will be eliminated. The UHV bypass disconnectors, developed based on this research, has passed the type test, and has successfully applied in UHV project.


Ren W.-Z.,Xian High Voltage Apparatus Rresearch Institute Co. | Yang Z.-Z.,Xian High Voltage Apparatus Rresearch Institute Co. | Hu X.-M.,Gansu Electrical Apparatus Research Institute | Xie T.-T.,Xian High Voltage Apparatus Rresearch Institute Co. | And 5 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

In this paper, the necessity of using electronic current transformer for transient protection in UHV power system is discussed. The electronic current transformer with the accuracy class of TPE and its test conditions are introduced. The test system and test method of instantaneous error of electronic current transformer are presented and used to test several 110~800 kV electronic current transformers, and the results meet the international and the IEC standards for instantaneous error test. Compared with the existing test system, the difference between the maximum peak instantaneous errors is less than 0.5%.


Zhang H.,Xian High Voltage Apparatus Rresearch Institute Co. | Huang S.,Xian High Voltage Apparatus Rresearch Institute Co. | Zhao Q.,Xian High Voltage Apparatus Rresearch Institute Co. | He B.,Xian High Voltage Apparatus Rresearch Institute Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2014

In this paper, the excitation characteristics of short-circuit generators was studied, and the basic principle, configuration and using effect of forced-excitation systems in domestic and foreign high-power laboratories were introduced. On the basis of running cost and efficiency, it made a comparison of three forced-excitation systems. It is proposed that static excitation is inevitable in high-power laboratories with the development of electrical electronic technology.


Zhao Q.,Xian High Voltage Apparatus Rresearch Institute Co. | Huang S.,Xian High Voltage Apparatus Rresearch Institute Co. | Fan C.,Xian High Voltage Apparatus Rresearch Institute Co. | Su Y.,Xian High Voltage Apparatus Rresearch Institute Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2015

Phase-selection switching will change the direct component of short-circuit current. In this paper, the peak current for switching at different phase angles is calculated, and the variation trend of time at zero and peak of asymmetric current is analyzed. The angles of three phases for obtaining maximum current shock coefficient are derived in the case of non-simultaneous three-phase switching, and the peak current coefficient in different poles simultaneity conditions is calculated as well. It is concluded that the simultaneity of three phases exerts a certain influence on peak current of phase-selection switching, and this feature can be applied to short-circuit tests in order to obtain suitable current parameters. ©, 2015, Xi'an High Voltage Apparatus Research Institute. All right reserved.


Shi Y.,Xian High Voltage Apparatus Rresearch Institute Co. | Yin X.,Xian High Voltage Apparatus Rresearch Institute Co. | Wu X.,Xian High Voltage Apparatus Rresearch Institute Co. | Luo H.,Xian High Voltage Apparatus Rresearch Institute Co. | And 3 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2014

A large number of operation data of high-voltage switchgears were analyzed, and a high-voltage switchgear reliability database was developed to achieve efficient management, query, computational analysis, etc. of the reliability data, and to standardize their collection and recording. This paper introduces the conception and implementation of the database system development. This work may provide an idea for future reliability researches of power grid equipment, and for laying down scientific and effective switchgear maintenance and repair strategies.

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