Time filter

Source Type

Pingdingshan, China

Cheng X.,Beijing Electrical Power Research Institute | Guan Y.,Tsinghua University | Zhang W.,Tsinghua University | Tang C.,Henan Pinggao Electrical Co.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2014

The mechanical state of high voltage circuit breaker can be reflected by its vibration signals during operation. The starting moment of vibration events extracted from the vibration signal can be taken as the characteristic parameter. The factor analysis can optimize and reduce the dimension of the characteristic parameters. The support vector machine (SVM) optimized by particle swarm optimization (PSO) can classify the different states of the circuit breaker. Several mechanical failures of circuit breaker are simulated and the results show that the factor analysis and SVM are suitable for mechanical state diagnosis of high voltage circuit breaker. Source

Liu X.,Shenyang University of Technology | Leng X.,Shenyang University of Technology | Cao Y.,Shenyang University of Technology | Song C.,Henan Pinggao Electrical Co.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2012

The arc is developed in the circuit breaker during the short circuit breaking, and the energy effective dissipation of the arc can directly affect the dielectric recovery characteristics. For qualitatively reflecting the transonic, variable boundary, variable gas flow path, the turbulent flow characteristics and the dynamic behavior of the arc occurring and developing under the short circuit breaking, the equivalent unit cell dynamic arc model was proposed and applied in this paper, and finite volume method was used as the multiple-physical fields simulation tool, the nonlinear arc quenching flow movement behavior of the breaking process was simulated. Moreover, the chaos theory was used to analyze the gas flow parameters of the breaking process, and the existence of arc chaotic characteristics in the arc burning process was identified and obtained. Source

Gu G.,Henan Pinggao Electrical Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2015

This paper briefly describes the function of transmission ratio calculation in mechanical characteristic analysis of a circuit breaker, and introduces an analytic calculation method of the transmission ratio. Taking a crank mechanism of circuit breaker for example, the transmission ratio of the mechanism is calculated, and the corresponding mathematical expressions are derived. The expressions can be used for convenient calculation and analysis of circuit breaker's moving mechanisms. ©, 2015, Xi'an High Voltage Apparatus Research Institute. All right reserved. Source

Cao Y.-L.,Henan Pinggao Electrical Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2011

A kind of mechanical three-pole-gang-operation SF 6 circuit breaker with hydraulic mechanism was developed based on present 252 kV self-energized single-pole-operation SF 6 circuit breaker with spring mechanism, and a suitable hydraulic mechanism and its transmission structure were selected through calculation to make it match with the no-load characteristic of single-pole-operation circuit breaker for simplifying the test. The emphases were given to the equations for calculating the related physical quantities in opening process of the circuit breaker, and the programming and computation of no-load characteristic of the three-pole-gang-operation circuit breaker based on the equations. The characteristic curves of several different hydraulic mechanisms were calculated and compared with the referenced mechanical characteristic curves. It is shown that the calculated results for selecting the hydraulic mechanism and its transmission structure meet the requirement of simplifying the test. This study may facilitate the product design. Source

Zhong J.-Y.,Henan Pinggao Electrical Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

A system simulation model is built with the device parameters from the Xiangjiaba-Shanghai HVDC Transmission Demonstration Project. The over-voltage generation mechanism and its distribution induced by three typical open circuit faults, i.e. the power absence of inverter substation, the open circuit of neutral line, and the open circuit of metal loop, are analyzed with the model. Moreover, aiming at the delay of protecting start-up and the operation delay of rapid grounding switch, a control method of over-voltage is presented. This study may be of help to the optimization of arresters layout for the following HVDC project. Source

Discover hidden collaborations