WO2017173835A1

WO2017173835A1 - Circuit breaker

Info

Publication number: WO2017173835A1
Application number: PCT/CN2016/107847
Authority: WO
Inventors: 张敬涛; 韩峰; 姚永其; 杨珂; 张鸣帅; 王鹏超; 朱秋楠; 张军伟; 郑国顺; 陈月卿; 张永记; 林建龙; 王家兴
Original assignee: 国家电网公司; 平高集团有限公司
Priority date: 2016-04-08
Filing date: 2016-11-30
Publication date: 2017-10-12
Also published as: CN105810492A; CN105810492B

Abstract

A circuit breaker, comprising a supporting insulator (1), an optical fibre current transformer and at least one arc extinguishing chamber (2, 3), wherein a top portion of the supporting insulator (1) is provided with a supporting insulator upper flange (16); the optical fibre current transformer comprises an optical fibre current transformer coil (17), with the optical fibre current transformer coil (17) being sheathed outside the supporting insulator upper flange (16); and the supporting insulator upper flange (16) is a conductor electrically connected to a movable contact of the corresponding arc extinguishing chamber (2, 3), so that a current of the arc extinguishing chamber (2, 3) passes through an inner hole of the optical fibre current transformer coil (17).

Description

Circuit breaker

Technical field

The invention relates to a circuit breaker in an ultra-high voltage device, in particular to a circuit breaker integrated with a fiber-optic current transformer.

Background technique

The integrated circuit breaker is one of the most important devices of the new generation of intelligent substation. It is highly intelligent and can be integrated with grounding switches, locking devices and electronic current transformers. The traditional electronic current transformers used in circuit breakers in ultra-high voltage devices are bulky and heavy, and cannot be integrated more efficiently on the isolating circuit breakers. Therefore, it is necessary to select fibers with smaller volume, lighter weight and more advanced technology. Current Transformer. The Chinese invention patent with the authorization number CN101553894B discloses a circuit breaker comprising two breaking units, namely an arc extinguishing chamber, a supporting insulator and a fiber optic current sensor, and the two breaking units and the supporting insulator are detachably connected through a mechanical casing, ie, a triple box. The fiber-optic current sensor comprises a fiber-optic current transformer coil, and an insulating flange of the supporting insulator is provided with an additional flange, that is, a supporting insulator upper flange, and the fiber-optic current mutual inductance coil is disposed in the groove of the additional flange and is located inside the supporting insulator. A circuit breaker unit is insulated from the mechanical housing, and the current is transmitted to the additional flange by the bypass connector, that is, the baffle plate, and the support insulator is internally provided with a cylinder to realize current flow through the inside of the fiber current transformer, and further transmitted to Mechanical housing and another disconnect unit. However, the circuit breaker needs to have a cylinder inside the supporting insulator to realize current flowing through the interior of the fiber current transformer, resulting in a complicated circuit breaker structure, and the cylindrical body and the fiber current sensing coil are disposed inside the supporting insulator, which will support The electric and magnetic fields inside the insulator have a large influence.

Summary of the invention

In order to solve the above technical problem, embodiments of the present invention are expected to provide a circuit breaker to solve the problem in the prior art that a structure is complicated due to the need to separately provide a conductor inside the supporting insulator to realize current passing through the inside of the fiber current transformer coil.

The technical solution of the embodiment of the present invention is implemented as follows:

Embodiments of the present invention provide a circuit breaker including a support insulator extending in an up and down direction, a fiber optic current transformer, and at least one arc extinguishing chamber disposed at an upper end of the support insulator, and a top of the support insulator is provided with a support insulator upper flange. The fiber optic current transformer comprises a fiber optic current mutual inductance coil, and the fiber optic current mutual inductance coil is sleeved on the outer part of the flange of the supporting insulator, and the upper flange of the supporting insulator is electrically connected with the movable contact of the corresponding arc extinguishing chamber to make the arc extinguishing chamber The current is passed through the conductor in the inner bore of the fiber optic current mutual inductance coil.

In the above solution, the arc extinguishing chamber has two first arc extinguishing chambers and a second arc extinguishing chamber, and the upper end of the supporting insulator is provided with a triple box, and the first arc extinguishing chamber and the second arc extinguishing chamber are respectively located in the triple joint. The first and second ends of the box are electrically connected to the upper flange of the supporting insulator through the conductive structure, and the upper flange of the supporting insulator is electrically connected with the triple box, and the triple box is insulated from the first arc extinguishing chamber.

In the above solution, the bottom ring of the upper flange of the supporting insulator is provided with a supporting boss for mounting the fiber current mutual inductance coil.

In the above solution, the lower end of the triple box has a triple box lower flange fixedly connected with the upper flange of the supporting insulator, and the lower flange of the triple box and the supporting boss provided at the bottom of the supporting insulator form a fiber current mutual inductance coil installation space.

In the above solution, the outer side of the installation space of the optical fiber current mutual inductance coil is provided with a sealing ring made of an insulating material for preventing entry of water and dust.

In the above solution, the sealing ring is disposed on the outer side of the installation space of the optical fiber current mutual inductance coil through a fixing structure, and the fixing structure comprises a mounting boss disposed on the supporting platform supporting the upper flange of the insulator and a lower flange disposed on the triple box Mounting groove at the lower surface.

In the above solution, a transition piece is disposed between the upper flange of the supporting insulator and the lower flange of the triple box, and the transition piece is respectively in sealing and sealing connection with the supporting insulator upper flange and the triple box lower flange, and is electrically connected.

In the above solution, the first arc extinguishing chamber includes a movable contact support, and the conductive structure includes a baffle electrically connected to the movable contact holder and a lower side of the support boss supporting the upper flange of the insulator. The connected terminal block, the other end of which is detachably and electrically connected to the baffle.

In the above solution, the supporting insulator is a cylindrical structure, and the circuit breaker further comprises a transmitting optical fiber for electrically connecting the optical fiber current mutual inductance coil to the collecting unit of the intelligent component cabinet of the outside, the transmission optical fiber is pre-buried in the support In the wall of the insulator.

The technical solution provided by the embodiment of the invention has the following beneficial effects: the fiber optic current mutual inductance coil is sleeved on the outer part of the flange of the supporting insulator, and the upper flange of the supporting insulator is a conductor, so that the current of the arc extinguishing chamber can pass through the upper flange of the supporting insulator. The current of the arc extinguishing chamber is passed through the inner hole of the fiber current mutual inductance coil, which solves the problem that the prior art needs to separately provide a cylinder in the inner cavity of the supporting insulator to realize current passing through the inner hole of the optical fiber current mutual inductance coil. The complicated problem solves the problem that the electric field and the magnetic field inside the supporting insulator are greatly affected by the fact that both the cylindrical body and the optical fiber current induction coil which are electrically conductive are disposed inside the supporting insulator.

DRAWINGS

1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

FIG. 2 is a schematic partial structural diagram of the portion A of FIG. 1 according to an embodiment of the present invention.

Among them, 1, support insulator; 2, first arc extinguishing chamber; 3, second arc extinguishing chamber; 4, intelligent component cabinet; 6, supporting insulator lower flange; 7, insulating tie rod; 8, triple box; Head support; 15, transmission fiber; 16, support insulator upper flange; 17, fiber optic current mutual inductance coil; 18, transition piece; 19, sealing ring; 20, triple box lower flange; 22, support platform; Current mutual inductance coil installation space.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the present invention provides a circuit breaker, as shown in FIG. 1 and FIG. 2, wherein FIG. 2 is an enlarged partial structural view of FIG. As shown in FIG. 1 , the circuit breaker has a T-shaped structure, including a fiber optic current transformer, a supporting insulator 1 extending in the up and down direction of the axis, and an axis fixed to the left and right sides of the upper end of the supporting insulator 1 through the triple box 8 in the left and right direction. The first arc extinguishing chamber 2 and the second arc extinguishing chamber 3 are extended, the fiber optic current transformer comprises a fiber optic current mutual inductance coil 17, the upper end of the supporting insulator 1 is provided with a supporting insulator upper flange 16, and the bottom integral ring supporting the insulator upper flange 16 A support boss 22 for mounting the fiber optic current mutual inductance coil 17 is provided. The fiber optic current mutual inductance line 17 is sleeved on the outer side of the upper portion of the upper flange 16 of the support insulator and is fixed to the support boss 22 by screws. The optical fiber in this embodiment The number of current mutual inductance coils 17 is one. The lower end of the triple box 8 is integrally provided with a triple box lower flange 20, and the triple box lower flange 20 and the support platform 22 form a fiber optic current mutual inductance coil installation space 23, in order to ensure that the current passes through the inner hole of the fiber optic current mutual inductance coil 17 during the operation of the product. A sealing ring 19 for blocking the distributed current is disposed outside the fiber optic current mutual inductance coil mounting space 23, and the sealing ring 19 is an insulating material, and the sealing ring 19 also prevents external rainwater and dust from entering the optical fiber current mutual inductance coil 17. The role. The sealing ring 19 is mounted by a combination of a boss and a groove, and a mounting boss is designed on the supporting platform 22 of the flange 16 supporting the insulator, and a mounting groove is designed at the lower surface of the flange 20 of the triple box. The self-fixation of the sealing ring 19 is achieved without the need to additionally mount the fixing connector.

As an embodiment, the first arc extinguishing chamber 2 and the second arc extinguishing chamber 3 each include a movable contact carrier 9 for driving the movable contact and an insulating pull rod 7 for moving the movable contact, and the optical fiber current mutual inductance coil 17 A current is required to pass through the inner hole of the optical fiber current mutual inductance coil 17. In the prior art, the movable contact carrier is directly electrically connected to the triple box, and the current is transmitted to the triple box through the movable contact carrier, and then transmitted to another arc extinguishing device. In the room. In order to pass the current through the inner hole of the fiber current mutual inductance coil 17, a conduction circuit for changing the current is required, and an insulating plate 11 is disposed between the movable contact holder 9 of the first arc extinguishing chamber 2 and the triple box 8 for dynamic contact The lower part of the head support 9 is connected with an L-shaped baffle 3 by bolts, and the current is externally led. The upper end of the baffle 3 is connected to the movable contact holder 9 through 6 bolts, and the baffle 3 and the supporting insulator are connected. A terminal block 12 is connected between the upper flanges 16. One end of the terminal block 12 is connected to the baffle 12 through six bolts 13. The other end of the terminal block 12 is supported by a screw 14 and a supporting platform for supporting the upper flange 16 of the insulator. The lower side of the 22 is fixedly connected. A transition piece 18 is disposed between the upper flange 16 of the support insulator and the lower flange 20 of the triple box, and the transition piece 18 is respectively in sealing engagement with the upper flange 16 of the support insulator and the lower flange 20 of the triple box, and electrically conductively connected, thereby completing the current. In the design of the flow direction, the current flow path is as shown in FIG. 10, and the current flows from the movable contact holder 9 of the first arc extinguishing 2, is conducted to the terminal block 12 via the deflector 3, and is transmitted from the terminal block 12 to the supporting insulator. The upper flange 16 is further conducted to the transition piece 18 and the triple box 8 and finally to the movable contact holder of the second arc extinguishing chamber 1. The fiber-optic current transformer coil 17 is mounted on the outside of the flange 16 of the post insulator, and no current flows from the outside. The terminal block 12 is a detachable terminal board, and is mounted on the lower side of the support platform 22 supporting the insulator upper flange 16 by screws. The current can be conducted according to the use requirements of the fiber-optic current transformer coil 17, and the deflector 12 is lowered. The installation accuracy is directly fixed by screws on the flange 16 of the supporting insulator, which is convenient for installation and disassembly.

As an embodiment, the supporting insulator 1 is a cylindrical structure, and the transmitting optical fiber 15 of the optical fiber current transformer coil 17 is embedded in the wall of the supporting insulator 1 and does not enter the inner cavity of the supporting insulator 1 to facilitate the outgoing line and other intelligence. The device is docked, the upper end of the transmission fiber 15 is connected to the fiber current mutual inductance coil 17, and the lower end of the transmission fiber 15 is taken out from the lower flange of the support insulator disposed at the lower end of the support insulator 1, and the transmission fiber 15 is connected to the intelligent component cabinet after the outgoing line. On the acquisition unit of 4, the signal acquisition, transmission and processing of the fiber-optic current transformer are completed, and the optical fiber 15 is transmitted. The fiber optic current transformer coil 17 is welded inside the strut insulator upper flange 16 supporting platform 22, and is fixed by an adhesive after welding, and the welded joint is not exposed to the air, thereby reducing the influence of the environment on product performance.

As an embodiment, the fiber optic current transformer coil 17 is integrated outside the supporting insulator 1 and does not enter the interior of the supporting insulator 1 and does not affect the internal electric field and the magnetic field of the supporting insulator 1, that is, the fiber optic current transformer coil 17 and the supporting insulator. 1 self-contained and highly integrated. The invention solves the problem that the prior art needs to separately provide a cylinder in the inner cavity of the supporting insulator to realize the current of the arc extinguishing chamber through the inner hole of the optical fiber current mutual inductance coil, thereby causing a complicated structure, and solving the cylinder due to the conductive effect. Both the body and the fiber current sensing coil are disposed inside the supporting insulator to cause a problem of a large influence on the electric field and the magnetic field inside the supporting insulator.

In other embodiments of the present invention, there may be only one arc extinguishing chamber, and the movable contact carrier of the arc extinguishing chamber is electrically connected to the connecting shell of the supporting insulator, and the current of the arc extinguishing chamber is transmitted to the supporting by the connecting shell. The upper flange of the insulator is used to realize the arc extinguishing chamber current passing through the inner hole of the optical fiber current mutual inductance coil, and finally to the next electric power circuit; the supporting insulator can also be provided with no supporting boss on the upper flange, and the optical fiber current mutual inductance can be The coil is directly fixed on the outer side of the flange of the supporting insulator; the optical fiber current mutual inductance coil can be fixed by epoxy casting without screw fixing; the number of optical current mutual inductance coils can also be adjusted according to the work requirements, Multiple coils are used in series; the other end of the baffle can be directly attached to the lower side of the upper flange of the supporting insulator without providing a wiring board; or between the upper flange of the supporting insulator and the lower flange of the triple box The transition piece is not provided. At this time, the upper flange of the supporting insulator and the lower flange of the triple box are sealed and electrically connected; the transmission fiber may not be embedded in the supporting insulator. Provided in the cylindrical wall of the lumen of the supporting insulator; fixing structure of the sealing ring can be connected by way of screws or gluing.

The technical solution provided by the embodiment of the invention has the following beneficial effects:

The fiber-optic current mutual inductance coil is sleeved on the outer part of the flange of the supporting insulator, and the upper flange of the supporting insulator is a conductor, so that the current of the arc extinguishing chamber can pass through the upper flange of the supporting insulator to realize the electric energy of the arc extinguishing chamber. Flowing through the inner hole of the fiber-optic current mutual inductance coil solves the problem that the prior art needs to separately provide a cylinder in the inner cavity of the supporting insulator to realize current passing through the inner hole of the optical fiber current mutual inductance coil, and the structure is complicated. The problem that the electric field and the magnetic field inside the supporting insulator are greatly affected due to the fact that both the conducting cylindrical body and the optical fiber current sensing coil are disposed inside the supporting insulator are solved.

The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting, and the present invention will be described in detail with reference to the embodiments described herein. The equivalent structure or equivalent process transformation made by using the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, are included in the scope of patent protection of the present invention.

Industrial applicability

In the embodiment of the invention, the circuit breaker comprises a supporting insulator, a fiber optic current transformer and at least one arc extinguishing chamber, the top of the supporting insulator is provided with a supporting insulator upper flange, the fiber optic current transformer comprises a fiber optic current mutual inductance coil, and the fiber optic current mutual inductance coil sleeve It is disposed outside the flange of the supporting insulator, and the upper flange of the supporting insulator is a conductor, so that the current of the arc extinguishing chamber can pass through the upper flange of the supporting insulator to realize the current of the arc extinguishing chamber passing through the inner hole of the optical current mutual inductance coil, and the solution is solved. In the prior art, it is required to separately provide a cylinder in the inner cavity of the supporting insulator to realize current passing through the inner hole of the current-conducting coil of the optical fiber, thereby causing a complicated structure, and at the same time solving the current sensing of the cylinder and the optical fiber due to the conductive action. The coils are all disposed inside the supporting insulator to cause a problem of a large influence on the electric field and the magnetic field inside the supporting insulator.

Claims

A circuit breaker includes a supporting insulator extending in an up and down direction, a fiber optic current transformer, and at least one arc extinguishing chamber disposed at an upper end of the supporting insulator, a top of the supporting insulator is provided with a supporting insulator upper flange, and the fiber current transformer comprises an optical fiber a current mutual inductance coil, wherein the optical fiber current mutual inductance coil is sleeved on the outer part of the flange of the supporting insulator, and the upper flange of the supporting insulator is electrically connected with the movable contact of the corresponding arc extinguishing chamber to make the current of the arc extinguishing chamber be the current of the optical fiber A conductor that passes through the inner bore of the mutual inductance coil.
The circuit breaker according to claim 1, wherein the arc extinguishing chamber has two first arc extinguishing chambers and a second arc extinguishing chamber, and the upper end of the supporting insulator is provided with a triple box, a first arc extinguishing chamber and The second arc extinguishing chambers are respectively located at the left and right ends of the triple box, and the first arc extinguishing chamber is electrically connected to the upper flange of the supporting insulator through the conductive structure, and the upper flange of the supporting insulator is electrically connected with the triple box, and the triple box and the first box are eliminated. Arc chamber insulation connection.
The circuit breaker of claim 1 wherein said bottom ring of said upper flange of said support insulator is provided with a support boss for mounting the fiber optic current mutual inductance coil.
The circuit breaker according to claim 3, wherein the lower end of the triple box has a triple box lower flange fixed to the upper flange of the supporting insulator, and the lower flange of the triple box and the supporting boss formed at the bottom of the supporting insulator are formed. Fiber optic current mutual inductance coil installation space.
The circuit breaker according to claim 4, wherein a seal ring made of an insulating material for preventing entry of water and dust is provided outside the installation space of the optical fiber current mutual inductance coil.
The circuit breaker according to claim 5, wherein the sealing ring is disposed outside the installation space of the fiber-optic current mutual inductance coil by a fixing structure, and the fixing structure comprises a mounting boss disposed on a supporting platform supporting the upper flange of the insulator And a mounting groove provided at the lower surface of the lower flange of the triple box.
The circuit breaker according to any one of claims 4 to 6, wherein a transition piece is disposed between the upper flange of the support insulator and the lower flange of the triple box, and the transition piece and the support insulator are respectively The lower flange of the flange and the triple box are sealed and matched and electrically connected.
The circuit breaker according to claim 2, wherein said first arc extinguishing chamber comprises a movable contact holder, said electrically conductive structure comprising a baffle electrically connected to the movable contact holder and a flange for supporting the insulator The lower side of the support boss is electrically connected to the terminal block, and the other end of the terminal block is detachably and electrically connected to the baffle.
The circuit breaker according to claim 1, wherein the supporting insulator is a cylindrical structure, and the circuit breaker further comprises a transmission fiber for electrically connecting the optical fiber current mutual inductance coil to an acquisition unit of the intelligent component cabinet of the outside, The transmission fiber is pre-buried in the wall of the support insulator.