CN110994419B - Uninterrupted maintenance system and uninterrupted maintenance method for multiport direct current circuit breaker - Google Patents

Uninterrupted maintenance system and uninterrupted maintenance method for multiport direct current circuit breaker Download PDF

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Publication number
CN110994419B
CN110994419B CN201911088994.6A CN201911088994A CN110994419B CN 110994419 B CN110994419 B CN 110994419B CN 201911088994 A CN201911088994 A CN 201911088994A CN 110994419 B CN110994419 B CN 110994419B
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China
Prior art keywords
direct current
switch
breaker
stage direct
stage
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CN201911088994.6A
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CN110994419A (en
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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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B3/00Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Breakers (AREA)

Abstract

The invention provides a non-power-failure maintenance system for a multi-port direct current breaker. The uninterrupted maintenance system for the multi-port direct current breaker comprises a loop, wherein at least three wiring ports are arranged on the loop, and a first isolating switch, a first grounding switch, a single-stage direct current breaker, a second grounding switch and a second isolating switch are sequentially arranged on a line between two adjacent wiring ports. The invention also provides a method for uninterrupted maintenance of the multi-port direct current breaker. The invention can avoid the power failure treatment of the whole system and avoid the economic loss caused by the maintenance power failure when the direct current breaker is overhauled.

Description

Uninterrupted maintenance system and uninterrupted maintenance method for multiport direct current circuit breaker
Technical Field
The invention relates to the technical field of maintenance of direct current breakers, in particular to a maintenance system and method for a multiport direct current breaker without power failure
Background
Along with the rapid development in the power grid, the multi-terminal flexible direct current transmission and distribution technology is applied, wherein the multi-terminal direct current circuit breaker is approved by a user because of strong controllability and low loss, but due to the large number of single-pole circuit breakers in the multi-terminal direct current circuit breaker, single-pole or multi-stage body faults can occur in long-term operation, and the upper-stage converter valve needs to be locked during maintenance, so that the whole system is powered off, and the system operation is influenced.
Disclosure of Invention
The invention aims to overcome the defect that the whole system is required to be powered off when a multi-port direct current breaker is overhauled, and provides a non-power-off overhauling system for the multi-port direct current breaker. The invention can avoid the power failure treatment of the whole system and avoid the economic loss caused by the maintenance power failure when the direct current breaker is overhauled.
The invention also provides a method for uninterrupted maintenance of the multi-port direct current breaker.
In order to solve the technical problems, the invention adopts the following technical scheme: the uninterrupted maintenance system for the multi-port direct current breaker comprises a loop, wherein at least three wiring ports are arranged on the loop, and a first isolating switch, a first grounding switch, a single-stage direct current breaker, a second grounding switch and a second isolating switch are sequentially arranged on a line between two adjacent wiring ports. According to the technical scheme, each wiring port is connected in a circumferential direction through the single-stage direct current circuit breaker and the grounding switches and the isolating switches on two sides of the single-stage direct current circuit breaker, when one single-stage direct current circuit breaker fails, only the isolating switches on two ends of the single-stage direct current circuit breaker with failure are required to be opened, the grounding switches on two ends are closed, the single-stage direct current circuit breaker with failure can be isolated from the whole system to be overhauled, and all wiring ports in the system are still electrified.
Furthermore, the isolating switch adopts a quick isolating switch, and the opening response time of the quick isolating switch is less than 20ms. The quick isolating switch can be used for quickly responding to the opening and separating of the gate, and the quick isolating switch can be used for automatically opening and closing a circuit after the load current exceeds a given value for a certain time or when a short circuit fault occurs.
Furthermore, the fracture on the quick isolating switch adopts a closed structure. The grounding switch adopts a slow grounding switch.
Further, an electromagnetic lock is arranged on the slow grounding switch, and the electromagnetic lock is interlocked with the isolating switch. The electromagnetic lock prevents the isolating switch and the grounding switch from being switched on and off under misoperation.
A method for uninterrupted maintenance of a multi-port direct current breaker comprises the following steps: s1, disconnecting an isolating switch at one end of a single-stage direct current breaker with faults; s2, direct current originally flowing through the single-stage direct current circuit breaker with the fault flows to other single-stage direct current circuit breaker lines without the fault; s3, disconnecting the isolating switch at the other end of the single-stage direct current breaker with the fault; s4, grounding and closing the two ends of the single-stage direct current breaker with faults, and S5, overhauling the single-stage direct current breaker with faults. It should be noted that in a system that operates normally, each isolating switch is in a closed state, and each grounding switch is in an open state.
Further, in step S1, after the isolating switch is opened, the dc current generates arc burning at the isolating switch opening, step S2 is completed, and step S3 is performed after the arc burning is extinguished. And the grounding switch connected with the two sides of the single-stage direct current breaking circuit which does not have faults in the step S2 is disconnected.
Further, the step S5 should be divided into the following specific steps:
s51, performing insulation test on a fault single-stage direct current breaker of a breaking circuit;
s52, performing performance test on the fault single-stage direct current breaker;
s52, replacing or maintaining the fault single-stage direct current breaker.
Compared with the prior art, the invention has the beneficial effects that:
the invention connects a plurality of wiring ports with a plurality of single-stage direct current breakers in a circumferential direction, cuts out the single-stage direct current breakers with faults into the whole system, and the direct current can flow into each wiring port from the single-stage direct current breaker circuit which is not disconnected; through be equipped with earthing switch and isolator respectively in the both sides of every single-stage direct current breaker for the trouble single-stage direct current breaker that needs to cut carries out thorough isolation with the system, and the maintenance personal of being convenient for overhauls the single-stage direct current breaker of trouble under safe environment.
Drawings
Fig. 1 is a schematic circuit diagram of a system for uninterrupted maintenance of a multi-port dc circuit breaker according to an embodiment.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated 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 numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Example 1
As shown in fig. 1, the uninterrupted maintenance system for the multi-port direct current breaker comprises a wiring port a, a wiring port B and a wiring port C, wherein a disconnecting switch DS32, a grounding switch ES32, a single-stage direct current breaker CB3, a grounding switch ES31 and a disconnecting switch DS31 are sequentially connected between the wiring port a and the wiring port B, a disconnecting switch DS22, a grounding switch ES22, a single-stage direct current breaker CB2, a grounding switch ES21 and a disconnecting switch DS21 are sequentially connected between the wiring port B and the wiring port C, and a disconnecting switch DS12, a grounding switch ES12, a single-stage direct current breaker CB1, a grounding switch ES11 and a disconnecting switch DS11 are sequentially connected between the wiring port B and the wiring port C. The design of the three connection ports in this embodiment to be described is not limited to the connection ports, and according to different practical situations, four or even more connection ports may be involved, and the design principle of the dc breaker system of the multiple connection ports is the same as the connection principle of the three ports.
In this embodiment, when the single-stage dc circuit breaker CB3 fails, the isolating switch DS31 and the isolating switch DS32 may be switched off, the grounding switch ES31 and the grounding switch ES32 may be switched on to be grounded, the dc current flowing from the wiring port a to the wiring port B will not go through the line directly connected to the wiring port C of the wiring port a, but flow from the wiring port a to the wiring port C to the wiring port B, so that the wiring port B can transmit the dc current, and when the single-stage dc circuit breaker CB2 or the dc circuit breaker CB3 fails, the grounding switch and the isolating switch are still utilized to switch the single-stage dc circuit breaker out of the whole system, and the dc current originally flowing through the branch will flow from the branch circuit, which is not disconnected in the loop, to each wiring port.
Example 2
A method for uninterrupted maintenance of a multi-port direct current breaker comprises the following steps: s1, disconnecting an isolating switch ES32 at one end of a single-stage direct current breaker CB3 with a fault; s2, direct current originally flowing through the single-stage direct current circuit breaker with faults flows to other single-stage direct current circuit breaker lines without faults from the wiring port A to the wiring terminal C and then 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 breaker CB3 with faults; s4, grounding and closing the two ends of the single-stage direct current breaker with the grounding switch ES31 and ES32, and S5, overhauling the single-stage direct current breaker CB3 with the failure.
In the step S1, after the isolating switch is opened, the direct current generates arc burning at the opening position of the isolating switch DS32, and after the step S2 is completed, the arc burning is extinguished, and then the step S3 is carried out. It should be noted that the grounding switches on both sides of the single dc device without failure are in the off state.
The step S5 should be divided into the following specific steps:
s51, performing insulation test on a fault single-stage direct current breaker CB3 of a breaking circuit;
s52, performing performance test on the fault single-stage direct current breaker CB 3;
s52, replacing or maintaining the fault single-stage direct current breaker CB3.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (3)

1. A method for uninterrupted maintenance of a multiport direct current breaker is characterized in that: the circuit comprises a loop, wherein at least three wiring ports are arranged on the loop, and a first isolating switch, a first grounding switch, a single-stage direct current breaker, a second grounding switch and a second isolating switch are sequentially arranged on a circuit between two adjacent wiring ports; the first isolating switch and the second isolating switch are both quick isolating switches, the opening response time of the quick isolating switches is less than 20ms, and the fracture on the quick isolating switches adopts a closed structure; the first grounding switch and the second grounding switch are both slow grounding switches, an electromagnetic lock is arranged on each slow grounding switch, and the electromagnetic lock is interlocked with the quick isolating switch, and the method further comprises the following steps: s1, opening a first isolating switch at one end of a single-stage direct current breaker with faults; s2, direct current originally flowing through the single-stage direct current circuit breaker with the fault flows to other single-stage direct current circuit breaker lines without the fault; s3, opening a second isolating switch at the other end of the single-stage direct current breaker with the fault; s4, performing grounding switch-on a first grounding switch and a second grounding switch at two ends of the single-stage direct current breaker, and S5, overhauling the single-stage direct current breaker; in the step S1, after the first isolating switch is opened, the direct current generates arc burning at the opening position of the first isolating switch, the step S2 is completed, and the step S3 is performed after the arc burning is extinguished.
2. The method for uninterrupted power supply maintenance of the multi-port direct current circuit breaker according to claim 1, wherein the method comprises the following steps: and in the step S2, the first grounding switch and the second grounding switch which are connected with the two sides of the single-stage direct current breaking circuit without faults are disconnected.
3. The method for uninterrupted power supply maintenance of the multi-port direct current circuit breaker according to claim 2, wherein the method comprises the following steps of: the step S5 is divided into the following specific steps:
s51, performing insulation test on a fault single-stage direct current breaker of a breaking circuit;
s52, performing performance test on the fault single-stage direct current breaker;
s53, replacing or maintaining the fault single-stage direct current breaker.
CN201911088994.6A 2019-11-08 2019-11-08 Uninterrupted maintenance system and uninterrupted maintenance method for multiport direct current circuit breaker Active CN110994419B (en)

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Citations (11)

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Publication number Priority date Publication date Assignee Title
CN103632895A (en) * 2013-12-04 2014-03-12 中国科学院电工研究所 Direct-current circuit breaker
CN104362663A (en) * 2014-12-05 2015-02-18 Pwm驱动有限公司 Multi-terminal DC (Direct Current) system-based circuit breaker device
CN104882877A (en) * 2014-02-28 2015-09-02 西门子公司 High voltage direct current breaker
CN106159987A (en) * 2016-06-30 2016-11-23 南京南瑞继保电气有限公司 A kind of direct current network topology and the method for the fast quick-recovery of fault isolation system
CN108599099A (en) * 2018-04-26 2018-09-28 中国科学院电工研究所 A kind of multi-line dc circuit breaker and cutoff method
CN109038329A (en) * 2018-08-13 2018-12-18 清华大学 A kind of three-port DC cut-offs the isolation repair method and device of equipment
CN109217337A (en) * 2018-10-16 2019-01-15 华南理工大学 A kind of isolated island detection of four ends DC distribution net and stable control method
CN109361197A (en) * 2017-11-30 2019-02-19 清华大学 A kind of overcurrent protective device and method
CN109755924A (en) * 2017-11-08 2019-05-14 清华大学 A kind of circuit topological structure of hybrid dc circuit breaker and direct current transmission and distribution system
CN109888742A (en) * 2019-01-31 2019-06-14 清华大学 A kind of three-port DC breaker control and protection system
CN211017992U (en) * 2019-11-08 2020-07-14 广东电网有限责任公司 Multiport direct current breaker maintenance system that does not have a power failure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8625316B2 (en) * 2011-12-09 2014-01-07 General Electric Company Neutral point clamped (NPC) power converter fault protection system

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103632895A (en) * 2013-12-04 2014-03-12 中国科学院电工研究所 Direct-current circuit breaker
CN104882877A (en) * 2014-02-28 2015-09-02 西门子公司 High voltage direct current breaker
CN104362663A (en) * 2014-12-05 2015-02-18 Pwm驱动有限公司 Multi-terminal DC (Direct Current) system-based circuit breaker device
CN106159987A (en) * 2016-06-30 2016-11-23 南京南瑞继保电气有限公司 A kind of direct current network topology and the method for the fast quick-recovery of fault isolation system
CN109755924A (en) * 2017-11-08 2019-05-14 清华大学 A kind of circuit topological structure of hybrid dc circuit breaker and direct current transmission and distribution system
CN109361197A (en) * 2017-11-30 2019-02-19 清华大学 A kind of overcurrent protective device and method
CN108599099A (en) * 2018-04-26 2018-09-28 中国科学院电工研究所 A kind of multi-line dc circuit breaker and cutoff method
CN109038329A (en) * 2018-08-13 2018-12-18 清华大学 A kind of three-port DC cut-offs the isolation repair method and device of equipment
CN109217337A (en) * 2018-10-16 2019-01-15 华南理工大学 A kind of isolated island detection of four ends DC distribution net and stable control method
CN109888742A (en) * 2019-01-31 2019-06-14 清华大学 A kind of three-port DC breaker control and protection system
CN211017992U (en) * 2019-11-08 2020-07-14 广东电网有限责任公司 Multiport direct current breaker maintenance system that does not have a power failure

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