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Yu M.,XD Switchgear Electrical Co. | Zhao W.,XD Switchgear Electrical Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2015

In order to investigate the influence of structure parameters of multi-orifice hydraulic buffer which used in the spring operating mechanism of high voltage circuit breaker to the opening operation, in this paper, a mathematical model of cushioning process based on buffer working principle is established. Then simulate and solve such mathematical model by MATLAB. First of all, to verify the simulation accuracy, the simulation and experimental curves are compared and analyzed. Then on this basis, through numerical simulation, it is found that the diameter and the spacing interval of damped orifice, the clearance between piston and cylinder block, and the stiffness of trip spring would influence the opening operation of circuit breaker. This study provides the theoretical guidance for designing and optimizing the performance of hydraulic buffer. © 2015, Xi'an High Voltage Apparatus Research Institute. All right reserved. Source

Zhang M.,XD Switchgear Electrical Co. | Wu X.,XD Switchgear Electrical Co. | Wang J.,XD Switchgear Electrical Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2014

Aiming at serious corrosion of GIS aluminum alloy housings during operation in recent years, the authors analyze two typical corrosion accidents at different positions of two GIS aluminum alloy housings. It is found that the electrochemical corrosion due to the circular current generated on bus's aluminum housing and the accumulated water at corrosion position (i.e. inductive potential) is the mail cause of the accidents. The rate and degree of corrosion depends on the circulation current density at corrosion defect. The authors describe the conditions and principle of generating electrochemical corrosion of the aluminum alloy housing, prove that AC electrochemical corrosion of GIS aluminum alloy housing will occur during operation in certain conditions, and provide some countermeasures against the corrosion. Source

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