CN115547736A

CN115547736A - One-time and two-time integrated on-column circuit breaker

Info

Publication number: CN115547736A
Application number: CN202211273345.5A
Authority: CN
Inventors: 胡达
Original assignee: Yangmei Electric Co ltd
Current assignee: Yangmei Electric Co ltd
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2022-12-30

Abstract

A primary-secondary fusion complete column upper circuit breaker comprises a three-pole support, a mechanism box and a transmission part, wherein a spring operating mechanism is positioned in the totally sealed mechanism box; a vacuum arc extinguish chamber is arranged in the tripolar strut, and a moving contact in the vacuum arc extinguish chamber is driven by the spring operating mechanism; the two sides of the mechanism box are provided with racks, and the side surface of the support is connected with an electronic current transformer; frame one end is provided with electronic type voltage transformer through the insulator, the frame other end is provided with voltage transformer through the insulator, and the incoming cable, electronic type voltage transformer, electronic type current transformer, vacuum interrupter, voltage transformer and the cable of being qualified for the next round of competitions flow through in proper order to the current, cable transformer with be equipped with isolator between the electronic type voltage transformer.

Description

One-time and two-time integrated on-column circuit breaker

Technical Field

The invention relates to a primary and secondary fusion complete column circuit breaker.

Background

With the continuous development of national economy, the structure and load characteristics of a power grid are increasingly complex. The electric power business of China is continuously developed and perfected, and strict requirements are put forward on the quality and the operation reliability of electric energy. At present, in a high-voltage power grid, the requirements for standardization and simplification become more and more obvious, so that the reliability is improved, and the installation and operation cost is reduced. The high-voltage vacuum circuit breaker is used as an indispensable main control and protection device in a power system, has high reliability, large breaking capacity and long overhaul period, is suitable for frequent operation, and has been increasingly widely applied to various fields of power industry, industrial and mining enterprises, railway transportation and the like.

The pole-mounted circuit breaker refers to a circuit breaker installed and operated on an electric pole, the circuit breaker refers to a switching device capable of closing, bearing and breaking current under normal loop conditions and closing, bearing and breaking current under abnormal loop conditions within a specified time, and primary and secondary integrated pole-mounted circuit breakers are one type of common pole-mounted circuit breakers.

A secondary fusion complete set of circuit breaker equipment is a post complete set of circuit breaker equipment with advanced technologies such as leading electronic voltage sensors, electronic current sensors, electric energy metering modules, high-speed fault transient wave recording and the like in the fusion industry, can realize self-adaptive integrated in-situ automation functions without depending on a distribution automation master station and communication, realizes in-situ line selection, area positioning and isolation of single-phase ground faults by a short circuit/ground fault detection technology, a non-voltage switching-off, fault path self-adaptive delay incoming switching-on and other control logics, realizes in-situ line selection, area positioning and isolation of single-phase ground faults and realizes fault area isolation and non-fault area power restoration by twice reclosing, and is the first choice of power distribution automation.

The conductive part of the primary-secondary fusion set of pole-mounted circuit breakers is an essential part for enabling the high-voltage vacuum circuit breaker to work normally, but the internal structure of the conductive part currently used needs to be improved.

Disclosure of Invention

The invention aims to provide a primary and secondary fusion complete column-mounted circuit breaker, which is convenient for assembling a conductive part and can effectively improve the stability.

The above object of the present invention is achieved by the following scheme:

a primary and secondary fusion complete column upper circuit breaker comprises a three-pole support, a mechanism box and a transmission part, wherein a spring operating mechanism is positioned in the totally sealed mechanism box; a vacuum arc extinguish chamber is arranged in the tripolar strut, and a moving contact in the vacuum arc extinguish chamber is driven by the spring operating mechanism; the two sides of the mechanism box are provided with racks, and the side surface of the support is connected with an electronic current transformer;

the method is characterized in that: frame one end is provided with electronic type voltage transformer through the insulator, the frame other end is provided with voltage transformer through the insulator, and incoming cable, electronic type voltage transformer, electronic type current transformer, vacuum interrupter, voltage transformer and the cable of being qualified for the next round of competitions are flowed through in proper order to the current, cable transformer with be equipped with isolator between the electronic type voltage transformer.

Furthermore, the electronic current transformer is made of an LPCT low-power coil.

Furthermore, the spring operating mechanism adopts a CTB-D type electric mechanism, and the energy storage motor adopts a unidirectional permanent magnet direct current motor.

Furthermore, the energy storage mechanism comprises a manual energy storage mechanism, wherein the manual energy storage operation is carried out by adopting an energy storage handle arranged outside the mechanism box, and the operation torque of the energy storage mechanism is not more than 100 N.m.

Furthermore, the load side is equipped with the arrester, and the circuit breaker body adopts aviation connector to be connected with three distant feeder terminals.

Furthermore, all aviation connectors adopt military grade accessories, and cables and aviation plugs are subjected to full-sealing treatment.

Furthermore, a mechanical interlock is arranged between the isolating switch and the circuit breaker body.

The energy storage principle of the circuit breaker is as follows:

the electric energy storage is realized, the output torque of the motor acts on the ratchet wheel, the cam and the crank arm are driven to rotate through the pawl, the closing spring stores energy, when the convex shoulder on the crank arm presses down the travel switch, the power supply of the motor is cut off, and the energy storage of the spring is finished.

And manually storing energy, applying 80-100N of manpower to a manual energy storage handle to drive an input shaft, and transmitting torque to a large gear of an output shaft fully meshed with a small gear through the small gear in the input shaft so as to drive a crank arm to rotate and store energy in a closing spring.

The switching-on process of the circuit breaker is as follows:

and after the electric operating mechanism receives a closing signal, the movable iron core of the closing electromagnet moves forwards to push the closing tripping rod to move, so that the closing half shaft rotates anticlockwise, and the constraint of closing a brake pawl is removed. Meanwhile, the closing pawl is pressed by the roller to rotate anticlockwise so as to release energy storage maintenance, the cam on the main shaft generates impact force due to contraction of the closing spring, the cam impacts the wheel on the rocker arm to rotate anticlockwise, and the impact force is transmitted to the circuit breaker through the crosspiece, so that closing operation is completed.

And (3) manually switching on, pulling a manual switching-on handle, applying 40-50N of manual force to drive a rod arranged on a manual switching-on/off shaft to rotate in the anticlockwise direction, and rotating a switching-on half shaft in the anticlockwise direction, so that the effect same as the operation of a switching-on electromagnet is generated, and the switching-on operation is completed.

Reclosing, namely completing the closing operation, wherein after the operating mechanism releases the energy of the energy storage spring, the breaker is in a closing non-energy storage state, the mechanism automatically performs electric energy storage, and the mechanism is in a closing energy storage state until the energy storage is finished. Once the breaker trips, a reclosing signal is received, and the mechanism can realize one-time automatic reclosing.

The opening process of the circuit breaker is as follows:

after the operating mechanism receives the opening signal, the movable iron core of the opening electromagnet moves forwards to push the opening tripping rod to move clockwise, so that the opening half shaft rotates clockwise, and the restriction of the opening catch is removed. Meanwhile, the opening pawl is pressed by the roller to rotate clockwise, and the rocker arm rotates clockwise under the thrust of the opening spring inside the breaker, so that the breaker is opened.

And (3) manually opening the brake, pulling a manual brake opening handle, applying 40-50N of manual force to drive a rod arranged on a manual brake opening and closing shaft to rotate clockwise, and driving a brake opening half shaft to rotate clockwise, so that the same effect as the brake opening electromagnet is generated to complete the brake opening operation.

The technical effects of the invention can be achieved by the scheme as follows:

the primary and secondary integration complete set of on-column circuit breakers are integrated with advanced technologies such as electronic voltage sensors, current sensors, electric energy metering modules, high-speed fault transient recording and the like. The complete equipment can realize the function of self-adaptive comprehensive type on-site automation without depending on a distribution automation main station and communication, self-adaptive multi-branch multi-contact power distribution grid structure can realize on-site line selection, area positioning and isolation of single-phase earth faults through control logics such as a short circuit/earth fault detection technology, non-voltage switching-off, fault path self-adaptive delay incoming call switching-on and the like, and realize fault area isolation and non-fault area recovery power supply through twice reclosing.

Drawings

Fig. 1 is a schematic structural diagram of a primary and secondary fused complete column circuit breaker according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a primary and secondary fused pole-set circuit breaker includes a three-pole, a mechanism box and a transmission part, wherein a spring operating mechanism is located in the totally sealed mechanism box; a vacuum arc extinguish chamber is arranged in the tripolar strut, and a moving contact in the vacuum arc extinguish chamber is driven by the spring operating mechanism; the two sides of the mechanism box are provided with racks, and the side surface of the strut is connected with an electronic current transformer 2;

frame one end is provided with electronic type voltage transformer 1 through the insulator, the frame other end is provided with voltage transformer 3 through the insulator, and the incoming cable, electronic type voltage transformer 1, electronic type current transformer 2, vacuum interrupter, voltage transformer 3 and the cable of being qualified for the next round of competitions flow through in proper order to the current, cable transformer with be equipped with isolator between the electronic type voltage transformer.

The electronic current transformer is made of an LPCT low-power coil.

The spring operating mechanism adopts a CTB-D type electric mechanism, and the energy storage motor adopts a unidirectional permanent magnet direct current motor.

The circuit breaker on the primary and secondary fusion complete set column comprises a manual energy storage mechanism, wherein the manual energy storage operation is carried out by adopting an energy storage handle arranged outside a mechanism box, and the operating torque of the manual energy storage handle is not more than 100 N.m. The load side is equipped with the arrester, and the circuit breaker body adopts the aviation connector to be connected with three distant feeder terminals.

All aviation connectors adopt military grade accessories, and cables and aviation plugs are subjected to full-sealing treatment. And a mechanical interlock is arranged between the isolating switch and the circuit breaker body.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A primary and secondary fusion complete column upper circuit breaker comprises a three-pole support, a mechanism box and a transmission part, wherein a spring operating mechanism is positioned in the totally sealed mechanism box; a vacuum arc extinguish chamber is arranged in the tripolar strut, and a moving contact in the vacuum arc extinguish chamber is driven by the spring operating mechanism; the two sides of the mechanism box are provided with racks, and the side surface of the support is connected with an electronic current transformer;

2. The secondary fused set of pole-top breakers of claim 1, wherein said electronic current transformer is fabricated using LPCT low power coils.

3. The primary and secondary fusion gang pole-mounted circuit breaker of claim 1, wherein the spring-operated mechanism is a CTB-D type electric mechanism and the energy storage motor is a unidirectional permanent magnet dc motor.

4. The primary and secondary fused gang column circuit breaker of claim 1, which comprises a manual energy storage mechanism, wherein the manual energy storage operation is performed by an energy storage handle arranged outside the mechanism box, and the operating torque of the manual energy storage mechanism is not more than 100N-m.

5. The secondary fused set of pole-top circuit breakers of claim 1 wherein the load side is provided with a surge arrester and the breaker body is connected to the three remote feeder terminals by aerial connectors.

6. The primary and secondary fusion gang pole-top breaker of claim 5, wherein all aerial connectors are military grade parts and cables and aerial sockets are hermetically sealed.

7. The primary and secondary fused gang column circuit breaker of claim 1 wherein a mechanical interlock is provided between the disconnector and the circuit breaker body.