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| Analysis of primary differential protection error caused by a line failure |
| Li Jie |
| Guangdong Power Grid Company Limited Shaoguan Power Supply Bureau, Shaoguan, Guangdong 512026 |
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Abstract This paper introduces a case of main variable differential protection error due to the failure of the 350kV substation at the 110kV terminal, and passes on-site inspections such as protection action message, accident record wave, CT lift flow, voltammetry characteristics, and insulation inspection. The failure of the secondary differential protection winding of the B-phase voltage Transformer in the main variation is determined, and the main variation differential protection is analyzed. It is concluded that the action situation satisfies the main variation dynamic logic conditions, and the correct action is proposed.
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Received: 20 May 2019
Published: 19 December 2019
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2019, Vol. 20 
