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| Analysis and countermeasures of closing process of 10kV no-load long cable line |
| ZHANG Jian |
| Hangzhou Automation Technology Research Institute Co., Ltd, Hangzhou 310030 |
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Abstract Using PSCAD simulation software,the paper simulates and analyzes the no-load closing process of long cable lines with various cross-sections, and the relationship between no-load closing current and cable length is put forward. The attenuation process of no-load closing current is simulated and calculated. According to the basic principle of relay protection setting, the maximum critical length of current quick-breaking protection for common cable cross section is determined, and the suggestion for the protection configuration of the long cable line is put forward. According to the breaking capacitive current capacity of 10kV circuit breaker, load switch and other equipment, the corresponding length of different cross-sections of cable lines and the shortcomings of the existing compensation schemes are analyzed, and it is suggested that when the line exceeds this length, special ordering requirements for circuit breaker or isolation handcart and other equipment should be put forward.
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Received: 12 November 2021
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2022, Vol. 23 
