KR20000055567A - Three folding link type trip free operating mechanism for circuit breaker - Google Patents

Abstract

PURPOSE: A three-fold link type trip free operation device of a circuit breaker is provided to reduce energy consumption for tripping a switch more than 30% by omitting link elements to rotate under gravity, thereby improving efficiency and reliability of products. CONSTITUTION: A cam element(100) is rotatable coupled with a supporting element(110) at one end part and rotatable coupled with a first operation link(130) supported by a first fixing element(120) at a lower part. The first operation link has an end part connected to a movable contact part(100b) for contacting or separating from a fixed contact part(100a) and the other end part rotatable coupled with an end part of a second operation link(140). The second operation link is rotatable mounted with a driven roller(141) at the other end part and rotatable coupled with a guiding roller(142). A third operation link(150) has an end part rotatable coupled with a second fixing element(121) and the other end part contacting the guide roller. A making latch(180) is mounted at a lower part of the spring to be released at a making operation and a trip latch(190) is mounted at an upper part of the first operation link to be released at a trip operation. The cam element and the first operation link are connected to first and second springs(160,170). Making solenoids are connected to upper parts of fourth and second links respectively connected to the making and trip latches for operating the making and trip latches.

Description

THREE FOLDING LINK TYPE TRIP FREE OPERATING MECHANISM FOR CIRCUIT BREAKER}

The present invention relates to a three-stage link-type trip free operation mechanism of a circuit breaker, and more particularly, to a three-stage link-type trip free operation mechanism installed in a high voltage circuit breaker, and is stable without being affected by gravity when the switch is tripped. As a result, it can be operated efficiently.

In general, a circuit breaker is a representative electrical protection device that serves to protect a load device and a line from a large current caused by a fault current in an electric circuit, such as a short circuit or a ground fault. To separate lines, and are used in a wide range of voltage levels, as well as in high and ultra high voltage circuits with voltages up to 25,000 volts. With this type of circuit, the circuit breaker is free to trip at any operating position associated with the input. You should be able to.

The trip free operation for freely performing the above trip means that the circuit breaker can freely trip the circuit breaker under any operating state, and the contact part is opened. The contact part of the breaker is closed. And tripping may occur during the switch closing operation, and the circuit protection and safety device or the operator may momentarily open the contact and override the switch closing operation if necessary so that the circuit breaker breaks the circuit.

In order to trip the circuit breaker freely, the circuit breaker structure must be designed in such a manner that a plurality of links are interconnected to move the switch contact portion of the circuit breaker to an open or closed position.

1, 2 and 3 are schematic diagrams respectively showing the operation state of the two-stage link-type trip-free operating mechanism of the conventional circuit breaker when the switch is opened, closed and trip-free, respectively. One end of the cam member 12 is rotatably coupled to the movable support member 11, and the trip free actuating mechanism is supported by the fixed support member 13 at the lower portion of the cam member 12 to operate the link 14. Is rotatably coupled, one end of the actuating link 14 is connected to the movable contact 10b which is in contact with and spaced apart from the fixed contact 10a, and the other end of the actuating link 14 is connected to the other end of the cam member 12. The roller 15 which contacts the end is rotatably installed, and the first and second springs 16 and 17 are connected to the cam member 12 and the operation link 14, respectively, and the cam member 12 A lowering latch 18 is installed at a lower portion of the lowering operation, and at one side of the movable support member 11 The trip latch 19 which is released during the trip operation is installed and configured.

Accordingly, as shown in FIG. 1, the cam member 12 receives the downward switch input force Fa by the tensioned first spring 16 while the initial switch is open, but is constrained by the closing latch 18. After the closing latch 18 is released, the first spring 16 applies the downward switch input force Fa to the cam member 12 to rotate the cam member 12 clockwise to switch the switch as shown in FIG. 2. The second spring 17, which serves to maintain the operating link 14 in the contact open state by applying an upward switch opening force Fb to the operating link 14, is maintained by the mechanism. In operation, the cam member 12 is tensioned by the clockwise rotation.

FIG. 3 shows that the moving support member 11 moves in the left direction in the drawing by releasing the trip latch 19 in the switched-in state (FIG. 2), and from the roller 15 provided at the other end of the operation link 14. A process of separating the other end of the cam member 12 is shown, means for releasing the closing latch 18 from the cam member 12, and means for releasing the trip latch 19 from the movable support member 11. This is provided.

At this time, when the cam member 12 releases the restraint of the trip latch 19, the movable support member 11 including the other end of the cam member 12 moves to the left in the drawing so that the operation link ( 14 provides a trip-free operation to space the contact between the roller 15 of the cam member and the other end of the cam member 12, the actuating link 14 being coupled to the upward switch opening force Fb of the second spring 17. By rotating in the counterclockwise direction, the fixed and movable contact portions 10a and 10b are opened.

The conventional circuit breaker described above uses a two-section link to provide an instant override capability to the circuit breaker, thereby providing a fixed and mobile contact 10a (10b) at any time during the switch closing operation of the circuit breaker. Can be opened.

On the other hand, the above-described prior art exemplifies only a part of the entire circuit breaker for the purpose of explanation of the present invention, and the rest of the rest is omitted for clarity.

However, such a conventional two-link trip-free mechanism has to move the cam member 12 and the movable support member 11 supporting the cam member 12 together in order to operate the switch in the tripped state. According to the installation direction of the circuit breaker, the trip free function is not possible due to the influence of gravity, and there are many problems such as an increase in energy consumption when switching a switch due to the mechanism structure.

Accordingly, the present invention is to solve the above problems, it is a three-section link-type trip-free mechanism installed in a high-voltage circuit breaker can be efficiently operated as a stable state without being affected by gravity when tripping. In addition, it aims to provide a three-section, trip-free trip mechanism for circuit breakers that can greatly reduce the energy required to operate the switch.

1 is a configuration diagram schematically showing an operating state when a two-link trip-free operating mechanism of a conventional circuit breaker is opened in a switch;

Figure 2 is a schematic diagram showing the operation state when the two-stage link-type trip free operating mechanism of the conventional circuit breaker when the switch is turned on

3 is a configuration diagram schematically showing an operation state of a switch trip free of a two-link trip free operation mechanism of a conventional circuit breaker;

4 is a configuration diagram schematically showing an operating state at the time of opening a switch according to the present invention.

5 is a configuration diagram schematically showing an operating state at the time of switch-on according to the present invention

6 is a configuration diagram schematically showing an operating state of a switch trip fresh according to the present invention;

7 is a front view showing the present invention

8A is a detailed side view of FIG. 4

8B is an enlarged view illustrating main parts of FIG. 8A;

9A is a detailed side view of FIG. 5

9B is an enlarged view illustrating main parts of FIG. 9A;

10A is a detailed side view of FIG. 6

10B is an enlarged view illustrating main parts of FIG. 10A;

Explanation of symbols on the main parts of the drawings

100; Cam member 100a; Fixed contacts

100b; Moving contact 101; Axis of rotation

102; Roller 110; Support member

120; First fixing member 121; Second fixing member

130; First operational link 140; Second working link

141; Driven roller 142; Guide roller

150; Third operational link 160; First spring

170; Second spring 180; Closing latch

184; Input solenoid 190; Trip latch

194; Trip solenoid

In order to achieve the above object, the present invention provides a cam member, one end of which is rotatably coupled by a support member, and a lower end of the cam member, which is supported by a first fixing member and rotatably coupled to one end of the cam member. And a second actuating link having a first actuating link connected to a spaced moving contact portion, a second actuating link having one end rotatably coupled to the other end of the first actuating link and contacting the other end of the cam member at the other end; A third actuating link having one end rotatably coupled to the one side of the second actuating link by a second fixing member and having the other end inner side in contact with the guide roller of the second actuating link, the cam member and the first A plurality of elastic bodies each connected to an operation link to provide elastic force during operation, an input latch installed at a lower portion of the cam member to be released during a closing operation, and the closing A circuit breaker comprising an input solenoid for driving the device, a trip latch installed on the upper part of the first operation link and released during a trip operation, and a trip solenoid for driving the trip latch. This is achieved by providing a three-link, trip-free actuator.

The plurality of elastic members are characterized by consisting of an arm connected with the rotating shaft of the cam member, a first spring connected at both ends to a support shaft fastened to the fixed support, and a second spring connected to the first operating link.

One end of the third actuating link is characterized in that a trip roller which is in contact with the bottom surface of the trip latch at the time of initial opening and closing is rotatably installed.

The upper portion of the cam member is characterized in that the roller in contact with the closing latch is rotatably installed.

The trip latch is connected with a third spring for imparting elastic force during the operation of the trip latch, and the fourth spring for imparting elastic force during operation of the third operating link is connected between the third actuating link and the second fixing member. It is characterized by that.

A third link is rotatably coupled to the closing latch, a fourth link is coupled to an upper end of the third link, and an closing solenoid driving to operate the closing latch is connected to and mounted on an upper end of the fourth link. It features.

A first link is rotatably coupled to the trip latch, a second link is coupled to an upper end of the first link, and a trip solenoid driven to operate the trip latch is connected to and mounted on an upper end of the second link. It features.

Hereinafter, preferred embodiments of the present invention for achieving the above object will be described in detail with reference to the accompanying drawings.

4 is a configuration diagram schematically showing an operating state at the time of switch opening according to the present invention, FIG. 5 is a configuration diagram schematically showing an operating state at the time of switching the switch according to the present invention, and FIG. 6 is a switch according to the present invention. FIG. 7 is a front view illustrating the present invention, FIG. 8A is a detailed side view of FIG. 4, FIG. 8B is an enlarged view of main parts of FIG. 8A, and FIG. 9A is FIG. 5. 9B is an enlarged view of the main portion of FIG. 9A, FIG. 10A is a detailed side view of FIG. 6, and FIG. 10B is an enlarged view of the main portion of FIG. 10A.

According to the present invention, one end of the cam member 100 constituting the three-stage link-type trip free operation mechanism of the circuit breaker is rotatably coupled by the support member 110, and the first fixing part is fixed to the lower portion of the cam member 100. Supported by the member 120, the first actuating link 130 is rotatably coupled, one end of the first actuating link 130 is connected to the mobile contact (100b) in contact with and spaced apart from the fixed contact (100a) One end of the second operation link 140 is rotatably coupled to the other end of the first operation link 130, and the driven roller contacting the other end of the cam member 100 to the other end of the second operation link 140. 141 is rotatably installed, and the guide roller 142 is rotatably coupled to the second actuating link 140.

In addition, one end of the third actuating link 150 is rotatably coupled to one side of the second actuating link 140 by the second fixing member 121, and the other end inner side surface of the third actuating link 150 is formed. It is installed in contact with the guide roller 142, the first and second springs 160, 170 are connected to the cam member 100 and the first operation link 130, respectively, the cam member 100 In the bottom of the) is inserted latch 180 is released during the closing operation, the top of the first operating link 130 is provided with a trip latch 190 is released during the trip operation.

In addition, the first actuating link 130 is connected to the connecting rod 131, and the trip roller 151 is in contact with the bottom surface of the trip latch 190 at the initial opening and closing of one end of the third actuating link 150. Is rotatably installed, the cam member 100 is a support shaft 111 is rotatably coupled to the support member 110, the first spring 160 is a support shaft fastened to the fixed support portion 161 162 and both ends thereof are connected to an arm 102a connected together with the rotation shaft 101 of the cam member 100, and a roller 102 contacting the input latch 180 is rotatable on the cam member 100. The trip latch 190 is connected to a third spring 191 for imparting an elastic force during the operation of the trip latch 190, and the third actuating link 150 and the second fixing member 121 are connected to the trip latch 190. Between the fourth spring 152 for imparting an elastic force during the operation of the third operating link 150 is connected.

A first link 192 is rotatably coupled to the trip latch 190, a second link 193 is coupled to an upper end of the first link 192, and an upper end of the second link 193. A trip solenoid 194 driving to operate the trip latch 190 is connected and mounted, and a third link 181 is rotatably coupled to the input latch 180 and an upper end of the third link 182. A fourth link 183 is coupled to the upper end of the fourth link 183, and an input solenoid 184 driving to operate the input latch 180 is connected and mounted.

Referring to Figures 4 to 7 the basic operating state of the three-stage link-type trip free operation mechanism of the circuit breaker of the present invention configured as described above are as follows.

First, when the circuit breaker is switched from the open state as shown in FIG. 4 to the closed state as shown in FIG. 5, in order to perform the closing operation of the contact in the fixed and movable contact portions 100a and 100b as shown in FIG. 4. When the closing latch 180 is released, the cam member 100 is rotated in the clockwise direction by the closing force F1 by the first spring 160, wherein the other end inner surface of the third operation link 150 The guide roller 142 of the second actuating link 140, which is in contact with it, transmits a force to the third actuating link 150, and the third actuating link 150 attempts to rotate about the hinged portion. It is constrained by trip latch 190.

Accordingly, the guide roller 142 is guided by the other end inner side surface of the third actuating link 150, and the first actuating roller 141 installed on the upper end of the second actuating link 140 moves downward. As the link 130 rotates in the clockwise direction, the left side of the first operation link 130 moves upward, and the movable contact portion 100b contacts the fixed contact portion 100a as shown in FIG. During operation, the input force F1 of the first spring 160 is consumed while the cam member 100 is rotated and returned as the second spring 170 is tensioned due to the rotation of the first operation link 130. Force (F2; blocking force).

As described above, when the fixed and movable contact portions 100a and 100b are inserted and in the state as shown in FIG. 5, before the opening operation of the mechanism for switching the switch contact portion from the input state to the open state of FIG. 6 and before the switch contacts come into contact with each other. The tree-free operation that becomes an open operation is described below.

When the trip latch 180 is released, the return force F2 of the second spring 170 rotates the first operation link 130 counterclockwise. That is, when the trip latch 190 is released to start the switch opening operation, the restraint of the third operation link 150 is released. At this time, the second operation link 140 as shown in FIG. 4 or 5 during the closing state or the closing operation. The third actuating link 150 is rotated in the clockwise direction by the contact force acting between the guide roller 142 of the second actuating link 150 and the other inner side surface of the third actuating link 150, and thus the guide roller 142 and the 3 The contact of the other end inner surface of the operation link 150 is made free.

As a result, the driven roller 141 of the second operation link 140 freed with respect to the third operation link 150 has a relatively free sliding contact with the other end surface of the cam member 100, and the second operation link. As the 140 rotates in the clockwise direction, no restraining force is applied to the first actuating link 130, and the return force F2 of the second spring 170 counterclocks the first actuating link 130. Direction to eventually open the stationary and moving contacts 100a and 100b.

In FIG. 6, the third actuating link 150 is rotated by the release of the trip latch 190, so that the guide roller 142 of the second actuating link 140 and the other end inner surface of the third actuating link 150 are rotated. The second operating link 140, which is not restrained by the third operating link 150 due to free contact, rotates in a clockwise direction so that the driven roller 141 and the cam member 100 of the second operating link 140 are rotated. The other end surface of the c) is freely contacted without force transmission and the fixed and movable contact portions 100a and 100b are opened.

In addition, when the above-described circuit breaker is changed from the open state as shown in FIG. 4 to the closed state as shown in FIG. 5, the trip latch 190 is released before the fixed and movable contact portions 100a and 100b contact with each other. An operation that is converted to a state as shown in FIG. 6 is called a trip-free operation, in which the second operation link 140 is rotated by the cam member 100 in the open state and the third operation link (restricted by the trip latch 190) While moving downward by the guide roller 142 guided along the other end inner surface of the 150, the first actuating link 130 is rotated in the clockwise direction.

At the same time, the trip latch 190 is released while moving to the position where the movable contact portion 100b is inserted, so that the third operation link 150 rotates in the clockwise direction, and at the same time, the guide roller 142 and the third Since the contact of the other end inner surface of the operation link 150 is free, the second operation link 140 is rotated in the clockwise direction, and at the same time, the return force F2 of the second spring 170 is acted on, thereby enabling the first operation. The link 130 is rotated counterclockwise so that the movable contact portion 100b moves back to the open position.

On the other hand, the specific operation state of the three-stage link-type trip free operating mechanism of the circuit breaker of the present invention will be described with reference to Figs. 8A to 10B.

First, when the circuit breaker switches from the open state as shown in FIGS. 8A and 8B to the closed state as shown in FIGS. 9A and 9B, the input solenoid 184 is electrically driven to pull the fourth link 183 upwards. While the left free end of the third link 181 moves upward, the feeding latch 180 rotates clockwise, and the roller 102 and the feeding latch 180 provided on the upper portion of the cam member 100 are rotated. ) Is spaced apart in contact.

At the same time, the elastic force stored in the tensioned first spring 160 is rotated in the clockwise direction while the cam member 100 rotates clockwise through an arm 102a connected with the rotating shaft 101 of the cam member 100. The driven roller 141 mounted on the upper end of the second actuating link 140 performs a rolling motion along the surface of the cam member 100, wherein the actuating roller 141 is in contact with the other end inner surface of the third actuating link 150. The guide roller 142 of the second actuating link 140 pushes the other end inner surface of the third actuating link 150 to rotate the third actuating link 150 in a clockwise direction, but the third actuating link 150 ) Is constrained by the trip latch 190.

Therefore, the guide roller 142 moves along the other end inner surface of the third actuating link 150, and is mounted on the upper end of the second actuating link 140 when the cam member 100 continues to rotate clockwise. Driven roller 141 is made to perform a rolling motion to the highest point of the outer circumferential surface of the cam link 10 so that the second actuating link 140 and the first actuating link 130 are pushed downward so that the second actuating link 140 In the drawing, the left side portion of the first actuating link 130 coupled to the upper portion moves upward to move the moving contact portion 140b of the switch to the input position and contacts the fixed contact portion 140a, as shown in FIGS. 9A and 9B. The input is completed.

9A and 9B, the lower surface and the third operation of the trip latch 190 are driven by the first link 192 which rotates the trip latch 190 clockwise to start the opening operation in a state where the closing is completed. Since the contact state of the trip roller 151 installed at one end of the link 150 is separated, the other end inner surface of the third operation link 150 and the guide roller of the second operation link 140 during the closing state or the closing operation. The third actuating link 150 rotates in the clockwise direction by the contact force acting between the 142 and the contact between the other end inner surface of the third actuating link 150 and the guide roller 142 is free.

At this time, the second actuating link 140 which is not restrained by the other end inner surface of the third actuating link 150 has a contact force acting between the cam member 100 and the driven roller 141 and a tensioned second spring ( At the same time as the clockwise rotation by the 170, the driven roller 141 is free to slide upward along the surface of the cam member 100, the first operating link 130 is not subject to any restraining force As described above, the second spring 170 generates the switch opening torque in the counterclockwise direction to the first operating link 130 to make it open as shown in FIGS. 10A and 10B. do.

10A and 10B show that the contact between the other end inner surface of the third actuating link 150 and the guide roller 142 is freed by the rotation of the third actuating link 150, and the second actuating link 140 is freed. It is shown that the surface of the cam member 100 and the driven roller 141 is free to slide, and the first operation in which the movable contact portion 100b is coupled by the elastic restoring force of the second spring 170. As the left side of the link 130 is pulled downward, the fixed and moving contact portions 100a and 100b of the switch are opened.

Here, the driven roller 141 is shown that it can easily slide up along the surface of the cam member 100, such an open contact operation can be started at any time not only after the closing operation, but also during the switch closing operation of the mechanism Whenever the trip latch 190 releases the restraint of the third actuating link 150, the fixed and movable contact portions 100a and 100b of the switch can be switched to the trip free operation which is always open.

As described above, the present invention is not affected by gravity when tripping the switch because there is no link member to be rotated by gravity in order to achieve a trip state when compared to a circuit breaker composed of a conventional two-section link. It can operate efficiently in a stable state, which can reduce the energy required when tripping the switch by about 30% or more, and the reduction of energy required for the trip state reduces the energy for switching the switch to about 30% or more. This is a very useful invention that greatly improves the efficiency and reliability of the device.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and the present invention may be commonly used in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the following claims. Anyone with knowledge will be able to make various changes.

Claims (7)

A cam member having one end rotatably coupled by a support member, and a first movable member supported by the first fixing member to be rotatably coupled to a lower portion of the cam member, and having a first end connected with a moving contact portion which is in contact with and spaced apart from the fixed contact portion. A second actuating link provided with an actuating link, one end rotatably coupled to the other end of the first actuating link, and a second actuating roller provided at the other end contacting the other end of the cam member; A third actuating link rotatably coupled by a second fixing member and connected to the cam member and the first actuating link, the third actuating link being installed while the other end inner side is in contact with the guide roller of the second actuating link, A plurality of elastic bodies for providing, an input latch installed at a lower portion of the cam member to be released during the closing operation, and a driving to drive the closing latch; And a trip latch installed on an upper portion of the first actuating link, the trip latch being released during a trip operation, and a trip solenoid driven to operate the trip latch. Free implement mechanism. The method of claim 1, wherein the plurality of elastic body is composed of an arm connected with the rotating shaft of the cam member, a first spring connected both ends to a support shaft fastened to the fixed support portion, and a second spring connected to the first operating link A three-link, link-free trip mechanism for circuit breakers. 3. The three-link trip-free mechanism of claim 1, wherein a trip roller which is in contact with the lower end surface of the trip latch at initial opening and closing is rotatably installed at one end of the third actuating link. 2. The three-link trip-free actuation mechanism of the circuit breaker according to claim 1, wherein a roller in contact with the closing latch is rotatably installed on the cam member. According to claim 1, wherein the trip latch is connected to the third spring for imparting an elastic force during the operation of the trip latch, the elastic force during the operation of the third operating link between the third operating link and the second fixing member. 3. The tripping trip mechanism of claim 3, wherein the fourth spring is connected to the circuit breaker. The input latch of claim 1, wherein a third link is rotatably coupled to the input latch, a fourth link is coupled to an upper end of the third link, and an input solenoid driven to operate the input latch is coupled to an upper end of the fourth link. The three-section link trip-free mechanism of the circuit breaker, which is connected and mounted. The trip latch of claim 1, wherein a first link is rotatably coupled to the trip latch, a second link is coupled to an upper end of the first link, and a trip solenoid driven to operate the trip latch is coupled to an upper end of the second link. The three-section link trip-free mechanism of the circuit breaker, which is connected and mounted.