What Is Mechanical Linkage?

This paper analyzes the reliability of high-voltage circuit breakers using electrical and mechanical linkage methods based on the comparison of the fault probability distribution and the advantages and disadvantages of the two methods of mechanical linkage and electrical linkage.
1 Introduction High voltage circuit breakers play a control and protection role in the power system. The reliability of their performance is related to the safe and stable operation of the power system. In order to reduce the occurrence of non-full-phase opening and closing, some places need to use three-phase mechanical linkage. Some users more intuitively judge that the reliability of three-phase mechanical linkage circuit breakers is much greater than that of electrical linkage circuit breakers, but the actual situation requires specific analysis.

2 Breaker failure probability statistics According to CIGRE, from 1988 to 1991, a reliability survey of single-voltage SF6 circuit breakers of 66 kV and above commissioned from 1978 to 1991 was conducted for a total of 70,708 units. Failures due to failure of operating mechanisms accounted for 64.8% of the total failures, of which 21% are secondary electrical control and auxiliary circuit failures, and 43.8% are mechanical failures of the operating mechanism.

From 1989 to 1997, 110, 220, 330kV and 500kV SF6 of the national power system, the breakdown statistics of the operating mechanism of the circuit breaker are shown in Table 1. The operating mechanism includes two parts, one is the mechanical transmission part; the other is the control circuit and auxiliary circuit that control the opening and closing of the mechanical part, such as terminal blocks, contactors, auxiliary switches, opening and closing coils, micro-switches, Secondary components such as motors and gas relays. A total of 458 failures and 304 failures were reported.

Table 1 Statistics of partial faults of 110, 220, 330kV and 500kV SF6 circuit breaker operating mechanisms of the national power system from 1989 to 1997. The above statistics show that the main faults of circuit breakers are operating mechanism faults, and mechanical faults account for a large proportion.

Reliability comparison of high voltage switch electrical and mechanical linkage

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This paper analyzes the reliability of high-voltage circuit breakers using electrical and mechanical linkage methods based on the comparison of the fault probability distribution and the advantages and disadvantages of the two methods of mechanical linkage and electrical linkage.
1 Introduction High voltage circuit breakers play a control and protection role in the power system. The reliability of their performance is related to the safe and stable operation of the power system. In order to reduce the occurrence of non-full-phase opening and closing, some places need to use three-phase mechanical linkage. Some users more intuitively judge that the reliability of three-phase mechanical linkage circuit breakers is much greater than that of electrical linkage circuit breakers, but the actual situation requires specific analysis.

2 Breaker failure probability statistics According to CIGRE, from 1988 to 1991, a reliability survey of single-voltage SF6 circuit breakers of 66 kV and above commissioned from 1978 to 1991 was conducted for a total of 70,708 units. Failures due to failure of operating mechanisms accounted for 64.8% of the total failures, of which 21% are secondary electrical control and auxiliary circuit failures, and 43.8% are mechanical failures of the operating mechanism.

From 1989 to 1997, 110, 220, 330kV and 500kV SF6 of the national power system, the breakdown statistics of the operating mechanism of the circuit breaker are shown in Table 1. The operating mechanism includes two parts, one is the mechanical transmission part; the other is the control circuit and auxiliary circuit that control the opening and closing of the mechanical part, such as terminal blocks, contactors, auxiliary switches, opening and closing coils, micro-switches, Secondary components such as motors and gas relays. A total of 458 failures and 304 failures were reported.

Table 1 Statistics of partial faults of 110, 220, 330kV and 500kV SF6 circuit breaker operating mechanisms of the national power system from 1989 to 1997. The above statistics show that the main faults of circuit breakers are operating mechanism faults, and mechanical faults account for a large proportion.