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

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

A multi-port DC circuit breaker non-stop maintenance system

technical field

The utility model relates to the technical field of maintenance of DC circuit breakers, more particularly, to a system and method for non-stop maintenance of multi-port DC circuit breakers

Background technique

With the rapid development in the power grid, the multi-terminal flexible DC transmission and distribution technology has been applied. Among them, the multi-port DC circuit breaker has been recognized by users because of its strong controllability and low loss. However, due to the single-pole circuit breaker in the multi-port DC circuit breaker If the number is large, single-pole or multi-stage body failure will occur during long-term operation. During maintenance, the upper-level converter valve needs to be blocked, resulting in power failure of the entire system and affecting system operation.

Utility model content

The purpose of the utility model is to overcome the shortcoming that the entire system needs to be powered off when overhauling the multi-port DC circuit breaker, and to provide a multi-port DC circuit breaker non-power-off overhaul system. The utility model can perform maintenance on the DC circuit breaker without the need to perform power failure treatment on the entire system, thereby avoiding economic losses caused by the maintenance and power failure.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a multi-port DC circuit breaker non-stop maintenance system, which includes a loop, the loop is provided with at least three connection ports, the adjacent A first isolating switch, a first grounding switch, a single-stage DC circuit breaker, a second grounding switch and a second isolating switch are arranged in sequence on the line between the two connection ports. In this technical scheme, each wiring port is connected in a circular direction through the single-stage DC circuit breaker and the grounding switches and isolation switches on both sides of the single-stage DC circuit breaker. When one of the single-stage DC circuit breakers fails, only the The isolating switches at both ends of the faulty single-stage circuit breaker are opened, and the grounding switches at both ends are closed, so that the faulty single-stage DC circuit breaker can be isolated from the whole system for maintenance, and all wiring ports in the system can be repaired. Still powered on.

Further, the isolating switch adopts a fast isolating switch, and the opening response time of the fast isolating switch is less than 20ms. The fast isolating switch can quickly open and open with a fast response time, and can also automatically open the circuit when the load current exceeds a given value for a certain period of time or when a short-circuit fault occurs.

Further, the fracture on the quick isolating switch adopts a closed structure. The grounding switch adopts the slow grounding switch.

Further, an electromagnetic lock is provided on the slow grounding switch. The slow grounding switch is interlocked with the isolating switch through the electromagnetic lock. The electromagnetic lock avoids the opening and closing of the isolating switch and the grounding switch under misoperation.

Further, the working voltage of the electromagnetic lock is 12V DC voltage. The working current of the electromagnetic lock is less than or equal to 250 mA. The slow grounding switch is provided with an electric spring for opening and closing

A method for uninterrupted maintenance of a multi-port DC circuit breaker, comprising the following steps: S1. opening the isolation switch at one end of the faulty single-stage DC circuit breaker; S2. DC current originally flowing through the faulty single-stage DC circuit breaker Flow to other unfaulted single-stage DC circuit breaker lines; S3. Open the isolation switch at the other end of the faulted single-stage DC circuit breaker; S4. Ground the grounding switches at both ends of the faulty single-stage DC circuit breaker. gate, S5. Overhaul the faulty single-stage DC circuit breaker. It should be noted that in a normal operation system, each isolating switch is in a closed state, and each grounding switch is in an off state.

Further, in step S1, after the disconnecting switch is opened, the DC current generates arc combustion at the opening of the disconnecting switch, step S2 is completed, and step S3 is performed after the arc combustion is extinguished. The grounding switches connected on both sides of the single-stage DC circuit breaker that has not failed in the step S2 are disconnected.

Further, the step S5 should be divided into the following specific steps:

S51. Insulation test of the faulty single-stage DC circuit breaker disconnecting the circuit;

S52. Perform performance test on single-stage DC circuit breaker;

S52. Replace or repair the faulty single-stage DC circuit breaker.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model connects a plurality of wiring ports with a plurality of single-stage DC circuit breakers in a circular direction. Once the faulty single-stage DC circuit breaker is cut out of the entire system, the DC current can still be used by the undisconnected single-stage DC circuit breaker. The circuit flows into each wiring port; the grounding switch and isolating switch are provided on both sides of each single-stage DC circuit breaker, so that the single-stage DC circuit breaker that needs to be cut out is completely isolated from the system, which is convenient for maintenance personnel Repair a faulty single-stage DC circuit breaker in a safe environment.

Description of drawings

FIG. 1 is a schematic circuit diagram of an uninterrupted maintenance system for a multi-port DC circuit breaker according to an embodiment.

Detailed ways

The present utility model will be further described below in conjunction with specific embodiments. Among them, the accompanying drawings are only used for exemplary description, and represent only schematic diagrams, not physical drawings, and should not be construed as restrictions on this patent; in order to better illustrate the embodiments of the present utility model, some parts of the accompanying drawings will be omitted. , enlargement or reduction, do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

The same or similar symbols in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms "upper", "lower", "left", " The orientation or positional relationship indicated by "right" and the like is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, It is constructed and operated in a specific orientation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation on this patent. specific meaning.

Example 1

As shown in Figure 1, a multi-port DC circuit breaker non-stop maintenance system, which includes a wiring port A, a wiring port B, and a wiring port C. The wiring port A and the wiring port B are sequentially connected to the isolation switch DS32 and the grounding switch. ES32, single-stage DC circuit breaker CB3, grounding switch ES31 and isolating switch DS31, between wiring port B and wiring port C are sequentially connected isolating switch DS22, grounding switch ES22, single-stage DC circuit breaker CB2, grounding switch ES21 and isolating switch DS21 , Wiring port C and wiring port A are sequentially connected to isolating switch DS12, grounding switch ES12, single-stage DC circuit breaker CB1, grounding switch ES11 and isolating switch DS11. It should be noted that the design of the three wiring ports in this embodiment does not limit the wiring ports. According to different actual situations, four or even more than four wiring ports may be involved. The connection principle of the DC circuit breaker system with multiple wiring ports is the same as The connection principle of the three ports is the same.

In this embodiment, when the single-stage DC circuit breaker CB3 fails, the isolating switch DS31 and the isolating switch DS32 can be opened, the grounding switch ES31 and the grounding switch ES32 can be closed and grounded, and the connection port A flows to the connection port B. The DC current will not take 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 the DC power, the single-stage DC circuit breaker CB2 or the DC circuit breaker When the circuit breaker CB3 fails, the grounding switch and isolating switch are still used to cut the faulty single-stage DC circuit breaker out of the entire system, and the DC current originally flowing through this branch will flow from the unbroken branch of the loop to each connection port. .

Example 2

A method for non-power-off maintenance of a multi-port DC circuit breaker, a method for non-power-off maintenance of a multi-port DC circuit breaker, comprising the following steps: S1. Open the isolation switch ES32 at one end of the faulty single-stage DC circuit breaker CB3; S2 . The DC current that originally flowed through the faulty single-stage DC circuit breaker flows to other single-stage DC circuit breakers that have not failed, and flows from terminal A to terminal C and then to terminal B, so that terminal B can still transmit DC power ; S3. Open the isolating switch DS31 at the other end of the faulty single-stage DC circuit breaker CB3; S4. Ground the grounding switches ES31 and ES32 at both ends of the faulty single-stage DC circuit breaker, S5. Turn on the faulty single-stage DC circuit breaker. Class DC circuit breaker CB3 for maintenance.

In step S1, after the isolation switch is opened, the DC current generates arc combustion at the opening of the isolation switch DS32, step S2 is completed, and step S3 is performed after the arc combustion is extinguished. It should be noted that the grounding switches on both sides of the single DC unit that is not faulty are in the off state.

The step S5 should be divided into the following specific steps:

S51. Perform insulation test on the faulty single-stage DC circuit breaker CB3 that disconnects the circuit;

S52. Perform a performance test on the faulty single-stage DC circuit breaker CB3;

S52. Replace or repair the faulty single-stage DC circuit breaker CB3.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the claims of the present utility model.

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.

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