JPS5916232A - Breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a circuit breaker in which a resistor is inserted to suppress the overvoltage that occurs when the circuit breaker is turned on. [Technical Background of the Invention] Conventionally, in power transmission systems of 500 KV or higher, in order to suppress switching overvoltages of circuit breakers, especially closing overvoltages when closing circuit breakers, a resistor is closed before the main contacts are closed. A resistance input method is used. However, in recent years, 300
Large-capacity cable power transmission is being implemented to increase the capacity of KV-class power transmission systems and strengthen the same systems in urban areas, and some systems with charging currents exceeding 1000 A are emerging, and in such systems, conventional Overvoltage when the breaker is turned on, which was not a problem with 300K V class C, has become a problem. Furthermore, in such a system, the voltage induced not only in the main circuit but also in the couple sheath is high, which threatens the insulation layer of the cable. Therefore, in a system with a large charging capacity, even if the voltage class is low and the breaker does not have the responsibility for restarting, it is possible to handle the overvoltage at the time of turning on with some one stage (
It is necessary to suppress J to a low value. However, for circuit breakers with a rated voltage of 300 KV or less, the capacity of the tank that houses the breaker is generally small, and it is extremely difficult to store the closing resistor and resistance switching contacts separately and in parallel with the main breaker. In order to suppress overvoltage applied to the 300 KV cable system in the future, an important issue will be how to install the switching contact of the resistor inside the 1b break. It's coming. Furthermore, as circuit breakers of 500 KV or higher, which originally adopt a resistance closing method, have increased in capacity and become relatively smaller, rational structures of resistors and resistance switching contacts are required. Now, the applicant has previously proposed Japanese Patent Application No. 55-134405 (Japanese Unexamined Patent Publication No. 56-56), which aims to reduce the size of a circuit breaker by installing a resistor and a resistance switching contact inside the main circuit breaker.
0019). The present invention is based on the gas breaker of this prior application, and further improves it to simplify the structure. As shown in Fig. 1, this gas breaker has a main breaker part 2 installed in a tank 1 filled with insulating gas. It is configured to cut off the The main breaker 2 is composed of a movable electrode 5 and a fixed electrode 6 disposed opposite to the movable electrode 5. The movable electrode 5 and the fixed electrode 6 each have main contacts 7 and 8. Arc contacts 9.10 are provided. And fixed type (digit 6
The arc contact 10 on the side is connected to the main contact 8 via a resistor 11, and is provided with a resistance switching contact 12 that can freely connect and separate from the arc contact 10, and this resistance switching contact 12 connects to the fixed electrode 6. It is connected to the main contact 8 on the side. In the gas shield 14 having such a configuration, the current is cut off by sliding the movable electrode 5 of the main cutoff section 2 away from the movable electrode 5 to break contact with the fixed electrode 6. That is,
When a 15 disconnection command is input to the operating fluid device (not shown) and the drive section 13, which is a screw mechanism installed outside the tank 1, is activated, the insulated operating rod 1 connected to the drive section 13 is activated.
4 is pulled downward in FIG. 1, the lever 15 at its tip rotates in the direction 81, and the movable electrode 5 connected thereto slides to the right. In this case, the main contact 7.8 is separated first, but in the state shown in . The current is
The current flows from the side to the arc contact 9.10 side, and then ? The current flows to the main contact 8 on the fixed electrode 6 side via the resistive switching contact 12 connected to the secondary contact 10. Furthermore, when the movable electrode 5 slides, the arc contact 9.8 also separates, and an arc is generated between the two, but this arc is

[The insulating gas compressed by the movable cylinder 16 and the fixed piston '17 passes through the insulating nozzle 18 to the arc contact 9,
It is erased by spraying for 10 seconds. Thereafter, the resistor switching contact 12 is opened and the interruption is completed. On the other hand, when the movable electrode 5 moves forward, the arc contacts 9 and 10 contact each other, and the current flows through the resistor 11 inserted in series to the arc contact 10 on the fixed electrode 6 side to the main contact 8 on the fixed electrode side. flows to Thereafter, the movable electrode 5 further moves forward and the main contacts 7.8 come into contact, and after the main breaker is closed, the resistance switching contact 12 is closed to the arc contact 10 on the fixed side. In this way, before the main contacts 7 and 8 are closed, the arc contact 9, into which the resistor 11 is inserted,
10, the surge multiple at the time of closing is reduced, and the closing operation of the breaker is performed smoothly. By the way, in such a resistor input type breaker,
The opening/closing of the resistance switching contact 12 is carried out by the drive section 13 of the main breaker section 2.
By one auxiliary piston part that operates in parallel with the operation of the
be called. That is, an insulated operating rod 14 and a lever 15 are attached to the drive section 13 of the main breaker section 2, which is mounted on the outside of the side surface of the tank 1.
The movable electrode 5 of the main breaker part 2 is connected via the lever 15, and the first piston 20 of the auxiliary piston part 19 of the resistance switching contact 12 is connected to this lever 15. This first screw 1-20 is activated by the closing action by the lever 15 or by the L
; L L 1) When the screw moves reciprocally with the disconnection operation, the second screw 1-21 of the auxiliary screw 1-ring portion reciprocates with a certain delay in this reciprocating movement. The second screw 21 is connected to the base end of an insulated operating rod 22, which is installed parallel to the main breaker. 82 The linked link 23 rotates and moves the resistance switching contact 12 upward to perform the opening/closing operation. 1. Problems with the background art] It is true that in the gas breaker of the earlier application, This is more compact and has a simpler structure than the conventional circuit breaker, which has a resistor and resistance switching contact installed separately and in parallel with the main breaker.However, in reality, for the following reasons. However, it cannot be said that miniaturization and simplification have been sufficiently achieved.In other words, the closing and disconnecting of the resistor switching contact is always performed before the main breaker 2, so the resistance changes between closing and breaking. It is necessary to change the operating order of the switching contacts and the main breaker.For this reason, in the breaker of the previous application, the reciprocating movement of the operating rod 22 for the resistance switching contact is separated from the drive unit 13 of the main breaker 2. It was separated by auxiliary screws 1 to 19 of the body.
As this auxiliary screw 1 to one part, the first
A device with a complicated groove bottom was required, which included a piston 20 and a second piston 21 that outputs the output at the same time as the first piston 20. In addition, in the breaker of the prior application, since the resistance switching contact 12 opens and closes vertically, a link 4 is used to convert the reciprocating motion of the 4F insulated operating rod 22 parallel to the main breaker section 2 into this vertical motion. A large number of shrines such as 23 and bottles for connecting them were required. As a result, the number of parts in the entire circuit breaker increases, making it difficult to downsize and simplify it.
Along with this, there was also the drawback that the volume of the sealed tank for storing this breaker increased. It is an object of the present invention to provide a small and simplified breaker that always has a resistive switching contact as its main component and can be turned on and off before the p-cut point without increasing the tank volume. [Summary of the invention] In the breaker of the present invention, the resistance switching contacts on the movable side and the fixed side are installed facing each other. The contacts are connected to the fixed electrode via a resistor, and at least one of these resistor switching contacts is connected to a tamper that is placed on the other resistor switching contact side.
J t), at the time of closing, the C resistor switching contact is closed in advance of the main breaker while accumulating energy in the damper, and at the time of breaker, the main contact and the resistor are connected by utilizing the delay in the return of the resistor switching contact due to the damper. The opening/closing contact is cut off before the arcing contact. [Embodiment of the Invention] An embodiment of the present invention will be described with reference to FIGS. 2 to 4. The same parts as those of the circuit breaker in FIG. 1 are given the same numbers and their explanations are omitted. Both the main contact 8 and the arc contact 10 are housed in a cylindrical body 50 made of an insulating material or a partial pressure capacitor. Resistance switching contacts 31.3 on the electrode 6 side and movable electrode 5 side
2 are stacked facing each other. Among these, movable electrode 5
The resistance switching contact 31 on the side is integrally connected to the arc contact on the movable electrode 5 side. On the other hand, the resistance switching contact 32 on the side of the fixed electrode 6 is a rod-shaped member as a whole, and is supported by a damper 33 provided on the cylindrical body 50. This damper 33 uses, for example, a wipe spring 34 that utilizes the sliding resistance of a spring and its cane. The amount of resistance on the closed connection y1131 is biased by u (=J force. Also, this damper 33 is
The damper 33 is supported so as to be slidable in parallel with the moving direction of the movable electrode 5, and a link mechanism for driving a resistance closing contact is connected to one end of the damper 33. That is, the movable electrode 5 is connected to a drive unit 13 provided outside the tank 1 via an insulated operating rod 14, and a GJ is installed between this insulated operating rod 14 and the drive unit 13. One end of a first lever 36 constituting a resistor switching contact drive link is connected to the swing link 35 . One end of an operating rod 38 running parallel to the arc contact 9.10 is connected to the end of the second lever 36 opposite the rotational fulcrum 37. This operation 1" Irad 38 extends to the fixed electrode 6 side a3,
The tip of each lever is connected to one end of a second lever 39 which is pivotally connected to the fixed electrode 6. This second lever 39 has, with respect to its rotational fulcrum 40,
A damper 33 of the fixed electrode resistance switching contact 32 is connected to the same side as the connection point of the operating rod 38. The rear part of this damper 33 is connected to a resistor 11 provided at the rear of the fixed electrode 6 via a flexible conductor 41, and the resistor 11 is connected to the conductor on the fixed electrode side of the breaker as well as the fixed electrode 6 side. ing. Next, the operation of the circuit breaker of this embodiment having such a configuration will be explained. First, at the time of closing, when a closing command is input to the drive unit 13 in the state shown in FIG. 2, the insulated operating rod 14 pushes the movable electrode 5 and moves it forward. At this time, the insulated operation rod 14
The second lever 36 is fixed to the fulcrum 3 via the swing link 35.
7, and move the operating iron 38 to the movable electrode 5 side t.
J attract. On the other hand, the pulled operating rod 38 is located on the fixed electrode 6 side J3, rotates the second lever 39 about the fixed fulcrum 40, and pulls it toward the movable electrode 5 side. This pulled second lever 39 is connected to a damper 33 on the same side of the rotational fulcrum 40 as the fulcrum of the operating rod 38, so this damper 33 is also pulled toward the movable electrode 5 side. be lost. Therefore, the damper 33 moves forward facing the iiJ movable electrode quinary, and the resistive switching contact 31 supported at the tip of the damper 33 contacts the resistive switching contact 32 of the movable electrode 5. This contact is made earlier than the contact of the arc contacts 9.10 as the cylinder 33 moves forward. Therefore, before the arc contacts 9 and 10 are brought into contact, the resistor 11 is inserted between the two electrodes via the flexible conductor 41. After that, the movable electrode 5 moves further forward, and the contact 9 of the movable electrode 5 contacts the arc contact 10 of the fixed electrode 6, and the resistor 11 and its resistance switching contacts 31 and 32 are short-circuited, and the movable electrode 5 moves further forward. -, the main contact 7.8 comes into contact and the closing operation is completed.During this time, the resistive switching contact 31 of the fixed electrode 6
is pressed against the resistance switching contact 32 on the movable electrode 5 side, and is housed in the tamper 33 against the wipe spring 34 to maintain a moderate pressure contact with the resistance switching contact 31 of the movable electrode 5. . When the -C, i→i command is entered into the drive unit '13 in the state shown in FIG. Then, the damper 33 of the fixed electrode 6 begins to retreat. Here, the breaking speed of the breaker is very fast, and the rise after the movable electrode 5 and the damper 33 is also very fast, so the restoring speed of the wipe spring 34 in the damper 33 cannot follow the backward speed of the damper 33 itself. . Therefore, the retraction of the movable electrode 5 is completed while the wipe spring 34 is still in the compressed state. Therefore, as shown in FIG.
are separated first, and the insulation recovery speed of the resistance switching contacts 31.32 is faster than the opening speed of the main contacts 7.8 and arcing contacts 9.10, and the withstand voltage value of the former always exceeds the latter, and the current interrupting duty is What V is applied to the arc contact 9.10? In addition, in a completely cut-off state, the resistance switching contact 3 of the fixed electrode 6
1 Reset] - By setting the position of the main contact 8 of the fixed electrode 6 at almost the same position within the cylinder 50 that constitutes the shield, the resistance switching contact 31 is prevented from deteriorating the withstand voltage characteristics between both electrodes. Nor. This allows the link mechanism to increase the approach speed and opening speed J of the arc contact 9.10 and the main contact 7.8, and the approach speed and opening speed h of the resistance switching contact 3.1.32. Therefore, even if the relet 1◇'t is placed at the same position in the cylinder 50 where the shield of the contact 8 is, the resistance switching contact 31
, 3'2 can be introduced early and removed early.l] It's confusing. With the above configuration, the resistance switching contacts 31 and 32 are closed before the contacts 7.8 and 9.10 are closed, and are opened and closed first when they are opened. Therefore, unlike the breaker in the previous application, the auxiliary screw part 19 for outputting at a different time due to resistor injection is no longer required, and the breaker can be made smaller and the eaves (eaves) can be made smaller. The present invention is not limited to this embodiment, and the following embodiments can also be adopted. ■ In this embodiment, the damper The connection between the cylindrical body 33 and the resistor 11 is through the flexible conductor 41, but as shown in FIG.
The connection may be made by directly inserting it into the hole 52 opened in 1. In this case, the rear portion 51 of the damper 33 is freely slidably inserted into the IL 52 to ensure rain contact with the brush 53 within the hole 52. (2) In this embodiment, a wipe spring created by the sliding resistance between a spring and its case is used as the damper 33, but other types of dampers, such as a single damper, may be used. ■ In this embodiment, the operating rod 38 is connected via a pin on the side opposite to the insulated operating rod 14 with respect to the rotational fulcrum 37 on the first lever, and is connected via the pin on the same side of the rotational fulcrum 40 as the damper 33 on the second lever. However, in other embodiments J3, this first. The relationship between the second levers may be reversed. That is, in the second lever, on the same side as the insulated operating rod 14,
In the second lever, the operating rod 38 may be connected to the opposite side of the damper 33. (2) Furthermore, it is desirable that the three second levers constituting the link mechanism be made of an insulator for insulation purposes. ■ In other embodiments, one, J, or both of the resistance switching contacts may be simply connected by a tambour, without providing a link mechanism.
) can also be used to override it with a force of 1 in the contact direction. In this case, the tip of the resistance switching contact is placed at a position where it comes into contact before the main contact, and when it is cut off, it can be opened earlier than the contact due to the d difference for the restoring speed of the tambour. [Effects of the Invention] As follows, the present invention utilizes the postponement of the return speed of the resistance switching contact by the damper while avoiding closing the resistance switching contact before the arc contact and the main contact 5-. When the arc contact is cut off, the resistance switching contact is cut off at 111)°C first. Therefore, unlike in the past, there is no need for a mechanism to avoid reversing the operating order of the resistance switching contact and the main contact or arc contact at the time of breaking and closing. It can be achieved. As a result, it has become possible to downsize the entire circuit breaker, and a circuit breaker with a rated voltage of 300 KV can be used in a system with a large charging capacity or a system with reinforced insulation. When a resistor is installed to suppress the generated overvoltage, or when applied to a 500 KV class circuit breaker, a circuit breaker can be significantly reduced in size.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of the main breaker in the breaker of the prior application, and FIG. 2 is an enlarged sectional view of the main breaker in the disconnected state of the breaker according to an embodiment of the present invention. 3 is an enlarged sectional view of the main breaker in FIG. 2 in the closed state, FIG. 4 is an enlarged sectional view of the main breaker in FIG. 2 in the middle of collapse, and FIG. 5 is another embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of the main breaker of the breaker according to the example. 1...tank, 2...main breaker, 3...conductor,
5... Movable electrode, 6... Fixed electrode, 7.8... Main contact, 9°10... Arc contact, 11... Resistor,
12... Resistance switching contact, 13... Drive unit, 14...
- Insulated operating rod, 15... Lever, 1G... Movable cylinder, 17... Fixed piston, 18... Insulated nozzle, 19... Auxiliary piston part, 20... First piston, 21. ...Second piston, 22...Insulated operating rod, 2
3... Link, 31.32... Resistance switching contact, 33
...Damper, 34...1 Neup spring, 35...
Swing link, 36... 'th lever, 37.40...
Rotation fulcrum, 38... Operation 1] Tsudo, 39... Second lever, 41... Flexible conductor, 50... Cylindrical body,
5'1... rear, 52... hole, 53... ノ)shi.

Claims (1)

[Claims] (1) In a tank filled with insulating gas, movable side and fixed side electrodes constituting the main cutoff section are arranged facing each other, and these movable side and fixed side electrodes each have a main A breaker is provided with a contact and an arc contact, and the main contact and the arc contact are housed in a cylinder made of an insulating material or a capacitor.
5, resistance switching contacts on a movable side and a fixed side are provided facing each other in the cylindrical body, and the resistance switching contact on the movable side is connected to the electrode on the movable side, and the resistance switching contact on the fixed side is connected to a resistor. At least one of these resistive switching contacts is supported by a damper that biases the resistive switching contact toward the other resistive switching contact, and when the resistive switching contact is turned on, the damper is energized. However, the resistance switching contact is applied before the main breaker, and when the main breaker is disconnected, the main current-carrying part and the resistance switching contact are connected before the arc contact, taking advantage of the delay in the return of the resistance switching contact due to the damper. A breaker that is characterized by being designed to cut off electricity. (2) The resistor switching contact on the fixed side is attached to the damper 1 (
2. The circuit breaker according to claim 1, wherein the damper is slidably supported by the cylindrical body, and a link mechanism that interlocks with a drive mechanism of the movable part is connected to the damper. (3) As a link mechanism, one end of the first lever is connected to the drive mechanism of the movable electrode, one end of the operating rod is connected to the opposite end of the rotation fulcrum of this first lever, and the thin end of the operating rod is fixed. A pin is connected to one end of a second lever provided on the electrode side, and a tamper supporting a resistive switching contact is connected to the same side of the second lever as the rotational fulcrum of the second lever. A breaker according to claim 2, which uses a breaker. (4) The breaker according to claim 3, wherein the second lever is made of an insulator. (5) The circuit breaker according to claim 2 or 3, wherein the fixed side resistance switching contact and the resistor are connected by a flip-pull conductor. (6) The connection between the fixed-side resistance switching contact and the resistor is made by inserting the extended rear part of the resistance switching contact into a hole drilled in the resistor so that it can slide freely. Or the circuit breaker described in paragraph 3.