CN211017992U - Multiport direct current breaker maintenance system that does not have a power failure - Google Patents

Multiport direct current breaker maintenance system that does not have a power failure Download PDF

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Publication number
CN211017992U
CN211017992U CN201921932517.9U CN201921932517U CN211017992U CN 211017992 U CN211017992 U CN 211017992U CN 201921932517 U CN201921932517 U CN 201921932517U CN 211017992 U CN211017992 U CN 211017992U
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China
Prior art keywords
circuit breaker
direct current
current circuit
maintenance system
switch
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CN201921932517.9U
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Chinese (zh)
Inventor
黄强飞
陈建福
曹安瑛
陈海涵
陈锐
涂小涛
董华梁
张志成
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Guangdong Power Grid Co Ltd
Zhuhai Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Zhuhai Power Supply Bureau of Guangdong Power Grid Co Ltd
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Abstract

The utility model provides a multiport direct current circuit breaker maintenance system that does not have a power failure. The utility model provides a multiport direct current circuit breaker maintenance system that does not have a power failure, wherein, includes a loop, be equipped with at least three wiring port on the loop, be equipped with first isolator, first earthing switch, single-stage direct current circuit breaker, second earthing switch and second isolator on the circuit between two adjacent wiring ports in proper order. The utility model discloses can overhaul the time to direct current breaker, need not have a power failure to entire system and handle, avoid overhauing the economic loss that has a power failure and lead to.

Description

Multiport direct current breaker maintenance system that does not have a power failure
Technical Field
The utility model relates to a direct current breaker overhauls technical field, more specifically relates to a multiport direct current breaker maintenance system and method that does not have a power failure
Background
With the rapid development of a power grid, a multi-end flexible direct-current power transmission and distribution technology is applied, wherein a multi-port direct-current circuit breaker is approved by a user due to strong controllability and low loss, but due to the fact that the number of single-pole circuit breakers in the multi-port direct-current circuit breaker is large, single-pole or multi-stage body faults can occur in long-term operation, a higher-level converter valve needs to be locked during maintenance, power failure of the whole system is caused, and system operation is affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome when overhauing multiport direct current breaker, need provide a multiport direct current breaker maintenance system that does not have a power failure to whole shortcoming that carries out the system power failure. The utility model discloses can overhaul the time to direct current breaker, need not have a power failure to entire system and handle, avoid overhauing the economic loss that has a power failure and lead to.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a multiport direct current circuit breaker maintenance system that does not have a power failure, wherein, includes a loop, be equipped with at least three wiring port on the loop, be equipped with first isolator, first earthing switch, single-stage direct current circuit breaker, second earthing switch and second isolator on the circuit between two adjacent wiring ports in proper order. This technical scheme carries out the hoop through earthing switch and the isolator of single-stage direct current circuit breaker and single-stage direct current circuit breaker both sides between every wiring port and connects, when one of them single-stage direct current circuit breaker broke down, only need carry out the separating brake with the isolator at single-stage circuit breaker both ends that break down, closes a floodgate with the earthing switch at both ends, just can separate out the single-stage direct current circuit breaker of trouble from entire system and overhaul, and all wiring ports in the system still electrify.
Furthermore, the isolating switch adopts a quick isolating switch, and the switching-off response time of the quick isolating switch is less than 20 ms. The quick isolating switch can quickly open and close the switch, has quick response time, and can automatically open and close the circuit after the load current exceeds a given value for a certain time or when a short-circuit fault occurs.
Furthermore, a fracture on the quick isolating switch is of a closed structure. The grounding switch adopts a slow grounding switch.
Furthermore, an electromagnetic lock is arranged on the slow grounding switch. The slow grounding switch is interlocked with the isolating switch through the electromagnetic lock. The electromagnetic lock prevents the disconnecting switch and the grounding switch from opening and closing under misoperation.
Further, the working voltage of the electromagnetic lock is 12V direct current voltage. The working current of the electromagnetic lock is less than or equal to 250 milliamperes. The low-speed grounding switch is provided with an electric spring for switching on and off
A method for overhauling a multiport direct current breaker without power outage comprises the following steps: s1, separating a disconnecting switch at one end of a single-stage direct-current breaker with a fault; s2, the direct current flowing through the failed single-stage direct-current circuit breaker originally flows to the circuits of other single-stage direct-current circuit breakers without faults; s3, separating a disconnecting switch at the other end of the single-stage direct-current circuit breaker with the fault; s4, grounding switches at two ends of the single-stage direct-current circuit breaker with the fault are subjected to grounding closing, and S5, the single-stage direct-current circuit breaker with the fault is overhauled. It should be noted that in a system in normal operation, each disconnecting switch is in a closed state, and each grounding switch is in an open state.
Further, the dc current generates arc burning at the opening of the disconnector after the opening of the disconnector in step S1, step S2 is completed, and step S3 is performed after the arc burning is extinguished. In the step S2, the grounding switches connected to both sides of the single-stage dc breaking circuit that has not failed are turned off.
Further, the step S5 is divided into the following specific steps:
s51, performing insulation test on a fault single-stage direct-current circuit breaker of a circuit breaking;
s52, performing performance test on the single-stage fault direct-current circuit breaker;
s52, replacing or maintaining the single-stage direct-current circuit breaker with the fault.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model connects a plurality of wiring ports with a plurality of single-stage DC circuit breakers in a circumferential direction, once the single-stage DC circuit breaker with a fault is switched into the whole system, the DC current can still flow into each wiring port from the circuit of the single-stage DC circuit breaker which is not disconnected; the earthing switch and the isolating switch are respectively arranged on two sides of each single-stage direct-current circuit breaker, so that the single-stage direct-current circuit breaker with the fault needing to be switched out is thoroughly isolated and insulated from the system, and maintenance personnel can conveniently overhaul the single-stage direct-current circuit breaker with the fault in a safe environment.
Drawings
Fig. 1 is a schematic circuit diagram of a non-stop maintenance system of a multi-port dc circuit breaker according to an embodiment.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Example 1
As shown in fig. 1, the non-stop maintenance system for the multi-port direct-current circuit breaker comprises a wiring port a, a wiring port B and a wiring port C, wherein a disconnecting switch DS32, an earthing switch ES32, a single-stage direct-current circuit breaker CB3, an earthing switch ES31 and a disconnecting switch DS31 are sequentially connected between the wiring port a and the wiring port B, a disconnecting switch DS22, an earthing switch ES22, a single-stage direct-current circuit breaker CB2, an earthing switch ES21 and a disconnecting switch DS21 are sequentially connected between the wiring port B and the wiring port C, and the wiring port C and the wiring port a are sequentially connected with the disconnecting switch DS12, the earthing switch ES12, the single-stage direct-current circuit breaker CB1, the earthing switch ES11 and the disconnecting switch DS 11. The design of three connection ports of this embodiment to be described is not to limit the connection ports, and according to different actual situations, four or even more than four connection ports may be involved, and the connection principle of the dc circuit breaker system with a plurality of connection ports is the same as that of the three ports.
In this embodiment, when the single-stage dc circuit breaker CB3 has a fault, the disconnecting switch DS31 and the disconnecting switch DS32 may be opened, the grounding switch ES31 and the grounding switch ES32 are closed and grounded, and the dc current flowing from the connection port a to the connection port B will not flow through the line directly connected to the connection port a and the connection port C, but flow from the connection port a to the connection terminal C and then to the connection port B, so that the connection port B can transmit dc current, when the single-stage dc circuit breaker CB2 or the dc circuit breaker CB3 has a fault, the grounding switch and the disconnecting switch are still used to switch the faulty single-stage dc circuit breaker out of the entire system, and the dc current originally flowing through the branch flows from the branch whose loop is not disconnected to each connection port.
Example 2
A method for overhauling a multiport direct current breaker without power outage comprises the following steps: s1, opening an isolating switch ES32 at one end of a single-stage direct-current circuit breaker CB3 with a fault; s2, the direct current flowing through the failed single-stage direct-current circuit breaker originally flows to other single-stage direct-current circuit breaker circuits which do not fail, flows from the wiring port A to the wiring terminal C and then flows to the wiring port B, so that the wiring port B can still transmit direct current; s3, disconnecting the disconnecting switch DS31 at the other end of the single-stage direct-current circuit breaker CB3 with the fault; s4, earthing switches ES31 and ES32 at two ends of the single-stage direct-current circuit breaker with the fault are switched on in an earthing mode, and S5, the single-stage direct-current circuit breaker CB3 with the fault is overhauled.
In step S1, the dc current generates arc burning at the opening of the isolating switch DS32 after the isolating switch is opened, step S2 is completed, and step S3 is performed after the arc burning is extinguished. It should be noted that the grounding switches on both sides of the single dc converter without failure are in the open state.
The step S5 is divided into the following specific steps:
s51, performing insulation test on a fault single-stage direct-current circuit breaker CB3 of a circuit breaking;
s52, performing performance test on the single-stage fault direct-current circuit breaker CB 3;
s52, replacing or repairing the single-stage direct current circuit breaker CB3 with the fault.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a multiport direct current circuit breaker maintenance system that does not have a power failure which characterized in that: the circuit comprises a loop, be equipped with at least three wiring port on the loop, adjacent two be equipped with first isolator, first earthing switch, single-stage direct current circuit breaker, second earthing switch and second isolator on the circuit between the wiring port in proper order.
2. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 1, wherein: the isolating switch adopts a quick isolating switch.
3. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 2, wherein: the isolating switch adopts a quick isolating switch with the switching-off response time less than 20 ms.
4. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 3, wherein: and a fracture on the quick isolating switch adopts a closed structure.
5. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 1, wherein: the grounding switch adopts a slow grounding switch.
6. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 5, wherein: and an electromagnetic lock is arranged on the slow grounding switch.
7. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 6, wherein: the slow grounding switch is interlocked with the isolating switch through the electromagnetic lock.
8. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 7, wherein: the working voltage of the electromagnetic lock is 12V direct current voltage.
9. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 8, wherein: the working current of the electromagnetic lock is less than or equal to 250 milliamperes.
10. The uninterruptible power maintenance system for the multiport direct current circuit breaker as recited in claim 6, wherein: and an electric spring for switching on and off is arranged on the slow grounding switch.
CN201921932517.9U 2019-11-08 2019-11-08 Multiport direct current breaker maintenance system that does not have a power failure Active CN211017992U (en)

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Application Number Priority Date Filing Date Title
CN201921932517.9U CN211017992U (en) 2019-11-08 2019-11-08 Multiport direct current breaker maintenance system that does not have a power failure

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110994419A (en) * 2019-11-08 2020-04-10 广东电网有限责任公司 Uninterrupted maintenance system and method for multi-port direct-current circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110994419A (en) * 2019-11-08 2020-04-10 广东电网有限责任公司 Uninterrupted maintenance system and method for multi-port direct-current circuit breaker
CN110994419B (en) * 2019-11-08 2024-04-12 广东电网有限责任公司 Uninterrupted maintenance system and uninterrupted maintenance method for multiport direct current circuit breaker

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