CN201156492Y - Combined high-voltage grounding switch - Google Patents

Abstract

The utility model relates to the field of high-voltage grounding switch, in particular to a combined high-voltage grounding switch comprising a 800kV grounding switch, which is characterized in that an auxiliary breaker and an auxiliary grounding switch are further included; the 800 kV grounding switch and the auxiliary grounding switch are connected in series; the auxiliary breaker and the auxiliary grounding switch are connected in parallel. The switch uses the ability of the auxiliary breaker in interrupting and switching current to realize the interrupting and switching function of the 750kV high voltage grounding loop induced current; the switch uses the ability of the auxiliary grounding switch to overcome the disadvantage of no obvious visible connection of the auxiliary breaker in the high-voltage grounding loop. The combined high-voltage grounding switch is particularly applicable to 750kV double-circuit transmission line.

Description

A kind of combined high-voltage earthed switch

Technical field

The utility model relates to the high voltage ground switch field, relates in particular to a kind of combined high-voltage earthed switch.

Background technology

Along with the development of electric power network, the voltage of power transmission and transformation is more and more higher.The 750kV electric power transmission network is built, need set up the common-tower double-return circuit, the transmission line increase in density, the induction that causes between these overhead transmission lines is fairly obvious, its actual electromagnetic induction voltage is about 25kV, and em induced current is about 200A, and electrostatic induction voltage is about 100kV, static induced current is about 25A, these parameter values be higher than GB GB1985-2004 regulation to the faradic requirement of earthed switch folding category-B.General earthed switch does not possess the arc extinguishing ability, and conventional 800kV earthed switch only possesses folding category-A induced current, does not possess folding category-B induced current, more can not be used for 750kV common-tower double-return circuit.Therefore, 750kV common-tower double-return circuit requires the earthed switch of corresponding power transmission line trackside must possess the higher faradic ability of folding.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of combined high-voltage earthed switch, can satisfy its faradic requirement of 750kV electric power transmission network common-tower double-return line side folding.

In order to solve the problems of the technologies described above, the technical solution of the utility model is to realize like this, a kind of combined high-voltage earthed switch, comprise the 800kV earthed switch, it is characterized in that, also comprise auxiliary circuit breaker and auxiliary earth switch, described 800kV earthed switch and the series connection of auxiliary earth switch, auxiliary circuit breaker and described auxiliary earth switch in parallel.

The rated voltage of described auxiliary earth switch is 126kV, and the rated voltage of described auxiliary circuit breaker is 126kV, and rated current is 2500A.

Because the utility model utilizes the fracture distance of conventional 800kV earthed switch when the separating brake position, satisfies the requirement of 750KV transmission line insulation against ground; Utilize auxiliary circuit breaker to cut-off ability with making current, realizing that 750kV high-tension line grounded circuit is faradic cut-offs and function is closed in the pass; Utilize the auxiliary earth switch can overcome auxiliary circuit breaker and in the high-voltage earthing loop, do not have the obviously visible defective that connects.Therefore, the utility model can satisfy the requirement of 750kV common-tower double-return line side earthed switch.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further details.

Fig. 1 is a structural representation of the present utility model.

Embodiment

Referring to Fig. 1, the 126kV earthed switch is installed on earthed switch basis 14, the lower end of 126kV earthed switch moving contact 7 joins with the earth by earthed switch basis 14, on the insulator 1 of 126kV earthed switch the 800kV earthed switch is installed, the lower end of 800kV earthed switch moving contact 5 is electrically connected with the fixed contact 6 of 126kV earthed switch, and 800kV earthed switch insulator 2 is provided with grading ring 3 and fixed contact 4.The 126kV circuit breaker is installed on circuit breaker basis 15, in disposed thereon insulator 9 of the dynamic and static contact of 126kV circuit breaker, its fixed contact joins by the fixed contact that connects copper bar 8 and 126kV earthed switch, and the moving contact of 126kV circuit breaker well contacts with the earth by ground connection copper bar 10.

The utility model also is provided with 126kV breaker operation mechanism 11,800kV earthing switch operating mechanism 12,126kV earthing switch operating mechanism 13.

The utility model is to realize operation like this.

When the needs closing operation, operation 800kV earthed switch closes a floodgate and puts in place earlier, and the auxiliary switch in its operating mechanism 12 is to 126kV breaker closing signal and through auxiliary relay time-delay 2 seconds; When the 126kV breaker closing put in place, the auxiliary switch in its operating mechanism 11 was given 126kV earthed switch switching signal, and last 126kV earthed switch closes a floodgate.Before operation 126kV breaker closing, operation 800kV earthed switch is safe, is equipotential between its dynamic/static contact, and the 800kV earthed switch closes the splice grafting earth-return by the 126kV circuit breaker after closing a floodgate and putting in place, closes and closes 750kV transmission system induced current.After operation 126kV earthed switch closed a floodgate, the operator can see the obvious grounded circuit of being made up of 800kV earthed switch and 126kV earthed switch.

When the needs sub-switching operation, opening button on the operation 800kV earthing switch operating mechanism 12 makes 126kV earthed switch elder generation separating brake earlier, when 126kV earthed switch separating brake put in place, the auxiliary switch in its operating mechanism 13 was given 126kV breaker open operation signal and was delayed time 2 seconds through auxiliary relay; When the 126kV breaker open operation put in place, the auxiliary switch in its operating mechanism 11 was given 800kV earthed switch sub-gate signal.Behind the 126kV earthed switch separating brake, grounded circuit is still connected, and operation 126kV circuit breaker cut-offs the induced current of 750kV transmission system; When operating the 800kV earthed switch again, be still equipotential between its dynamic/static contact.

Claims (2)

1, a kind of combined high-voltage earthed switch comprises the 800kV earthed switch, it is characterized in that, also comprises auxiliary circuit breaker and auxiliary earth switch, described 800kV earthed switch and the series connection of auxiliary earth switch, auxiliary circuit breaker and described auxiliary earth switch in parallel.

2, combined high-voltage earthed switch according to claim 1 is characterized in that, the rated voltage of described auxiliary earth switch is 126kV, and the rated voltage of described auxiliary circuit breaker is 126kV, and rated current is 2500A.

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