JP2004362889A - Switching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching device having a simple operation mechanism switching a breaking part and a disconnecting part in good order. <P>SOLUTION: The switching device is composed of a breaking part 1a composed of a vacuum valve 4 having one pair of first contacts 2, 3 free in contact and separation and a disconnection spring part 1a2 jointed to a movable axis 6 of the vacuum valve 4 so as to open the first pair of contacts 2, 3; and a disconnection part 1b having a pair of second contacts 12, 18 respectively fixed to the tip part of a first movable conductive axis 11 jointed to the movable axis 6, and to the tip part of a second movable conductive axis 19 arranged in the axial direction of the first movable conductive axis 11; and an operation mechanism 37 jointed to the second movable conductive axis 19. The breaking part 1a and the disconnection part 1b are successively switched by the operation of the operation mechanism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a switching device provided in an electric power system, and more particularly to a switching device capable of simplifying an operation mechanism for opening and closing a shutoff unit and a disconnection unit.
[0002]
[Prior art]
In power systems, switchgear such as circuit breakers and disconnectors are provided.The circuit breaker is responsible for interrupting large currents such as fault current in the circuit, and the disconnector is responsible for completely opening the circuit. are doing.
[0003]
Conventional circuit breakers and disconnectors have different responsibilities and are therefore configured as independent switchgear. The circuit breaker is opened and closed by an operation mechanism dedicated to the circuit breaker, and the disconnector is opened and closed by an operation mechanism dedicated to the disconnector (for example, see Patent Document 1).
[0004]
When opening these switchgears, an interlock mechanism for opening the circuit breaker first and then opening the disconnector is added. In the case of closing, on the contrary, the disconnector is closed, and then the circuit breaker is closed.
[0005]
On the other hand, there has been proposed a configuration in which the operation mechanism is shared and the responsibilities of the circuit breaker and the disconnector are performed by the same vacuum insulating container (for example, see Patent Document 2). This is achieved by providing a pair of contacts that can be freely contacted and separated in a vacuum insulated container and operating the operating mechanism in two stages, an in-position where the pair of contacts are in contact, a cut position where the contact is separated, and a disconnection that is further separated from the cut position. The position is formed.
[0006]
And, it has a duty of a circuit breaker at the entry position and the cut position, and has a duty of the disconnector at the disconnect position. For this reason, the operation mechanism performs a first operation for forming the entering position and the cutting position, and a second operation for forming the disconnecting position from the cutting position.
[0007]
[Patent Document 1]
JP-A-11-185577 (page 5, FIG. 1)
[0008]
[Patent Document 2]
JP-A-2000-164084 (page 15, FIG. 1)
[0009]
[Problems to be solved by the invention]
The above-described conventional switchgear has the following problems.
[0010]
In the case where the circuit breaker and the disconnecting switch are provided independently, an interlock mechanism for controlling the operation of each operation mechanism from the state of the operation mechanism must be added, which complicates the operation mechanism. That is, the disconnecting switch is provided with an interlock mechanism that can open and close only when the circuit breaker is open, and the circuit breaker can close the disconnection only when the disconnecting switch is closed. . If the disconnector is opened earlier than the circuit breaker, the arc is diffused and cannot be interrupted because the disconnector does not have a duty to interrupt.
[0011]
In the case where the operation mechanism is shared and the responsibility of the circuit breaker and the disconnector is performed in the same vacuum insulated container, for example, when the contact is opened, the operation mechanism operates in the order of disconnection and then disconnection. Can't happen. However, this operation mechanism has to be operated in two stages, which is complicated. That is, two types of operating mechanisms for opening and closing the pair of contacts are required, one for breaking and one for disconnecting.
[0012]
Due to such a complicated operation mechanism, maintenance and inspection work becomes difficult, and the overall shape of the operation mechanism becomes large.
[0013]
Therefore, an object of the present invention is to provide an opening / closing device that uses a vacuum valve to open and close a disconnection and a disconnection in order, and simplifies an operation mechanism for operating these.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, an opening and closing device according to the present invention includes a vacuum valve having a first pair of contacts that can be freely contacted and separated, and a movable shaft of the vacuum valve that opens the first pair of contacts. A first movable current-carrying shaft connected to the movable shaft, and a second movable current-carrying shaft arranged in the axial direction of the first movable current-carrying shaft. A disconnecting portion having a second pair of contact points which are fixed to and separated from each other at opposite ends, and an operating mechanism connected to the second movable energizing shaft, wherein a spring force of the open-circuit spring portion is provided. The operating force of the operating mechanism is made larger than that of the first movable member. After moving the energized shaft at the same time, first open the breaking After stopping the movement of the first movable energizing shaft, the second movable energizing shaft is continuously moved to open the disconnection portion, and when the pole is closed, the second movable energizing shaft is first opened. Is moved to close the disconnecting portion, and then the second movable conducting shaft and the first movable conducting shaft are moved to close the breaking portion.
[0015]
According to such a configuration, since the interrupting section and the disconnecting section are continuously opened and closed by the common operating mechanism, it is not necessary to add an interlock mechanism for controlling the open / close state of each other. In addition, the operation mechanism can have a simple structure.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing an opening / closing device according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating the operation of a blocking unit and a disconnecting unit according to the embodiment of the present invention.
[0017]
As shown in FIG. 1, a switchgear 1 according to the present invention includes a blocking part 1 a arranged in a line from the upper side to the lower part in the drawing, a disconnecting part 1 b connected in series to the blocking part 1 a, and a disconnecting part 1 a with the disconnecting part. It comprises an operation unit 1c for continuously opening and closing the unit 1b, and an operation mechanism unit 1d connected to the operation unit 1c. The blocking unit 1a, the disconnecting unit 1b, and the operating unit 1c are configured by connecting insulating layers 10, 16, 27, and 36, which will be described in detail later.
[0018]
The blocking part 1a is configured to be divided into a vacuum valve part 1a1 and an open circuit spring part 1a2.
[0019]
The vacuum valve section 1a1 is provided with a vacuum valve 4 having a pair of contact points (first pair of contact points) 2, 3 which can be freely contacted and separated. The contact 2 is fixed to the inner end of the vacuum valve 4 of the fixed energizing shaft 5 serving as one of the electric paths, and the movable end of the first movable shaft 6 which is in contact with and separates from the contact 2 at the inner end of the vacuum valve 4. Are fixed.
[0020]
The open-circuit spring portion 1a2 is provided with a cylindrical metal tube 7, one end of which is fixed in the axial direction of the vacuum valve 4, and the other end of which is open. An open-circuit spring 8 is provided in the metal cylinder 7 so as to surround the first movable shaft 6, and the open-circuit spring 8 is fixed to the axial surface of the vacuum valve 4 and the first movable shaft 6. It is sandwiched between the plates 9. The open end of the metal cylinder 7 is bent inward in an L-shaped cross section so that the disk 9 does not fall out of the metal cylinder 7.
[0021]
Around the vacuum valve 4 and the metal cylinder 7, a first insulating layer 10 is formed by exposing an end of the fixed energizing shaft 5 and molded with an insulating material such as epoxy resin.
[0022]
The disconnecting section 1b is configured to be divided into a first movable section 1b1 and a second movable section 1b2.
[0023]
The first movable portion 1b1 is provided with a second movable shaft 11 that is connected and fixed in the axial direction of the first movable shaft 6, and the first movable shaft 6 and the second movable shaft 11 It constitutes a first movable energizing shaft. A contact 12 is fixed to an end of the second movable shaft 11. A cylindrical guide tube 13 made of an insulating material such as a fluorine resin is provided around the second movable shaft 11, and one end thereof is fixed to an open end of the metal tube 7 with a bolt 14. . The guide cylinder 13 is provided so that the second movable shaft 11 can move slidably in the cylinder and can move linearly in the axial direction.
[0024]
Around the contact 12, the second movable shaft 11, the guide tube 13, and the like, a second insulating layer molded with an insulating material such as epoxy resin having a space portion 15 having one end opened in a cylindrical shape. 16 are provided integrally with the first insulating layer 10. In the space 15, a contact point 12, a second movable shaft 11, a guide cylinder 13, and the like are arranged. At the open end of the second insulating layer 16, an interface portion 16 a formed in a tapered shape to increase a creepage distance for insulation and a flange portion 16 b protruding in a radial direction for supporting and fixing are provided. Is formed. Note that a shield 17 for easing the electric field is embedded in the second insulating layer 16.
[0025]
A contact 18 is provided on the second movable portion 1b2 so as to face the contact 12, and a pair of contacts 12 that can be freely contacted and separated is formed to constitute a second pair of contacts. The contact 18 is fixed to an end of a second movable energized shaft 19 arranged in the axial direction of the second movable shaft 11. Further, the second movable energizing shaft 19 slidably penetrates the center of the cylindrical conductor 22 via the contact 20 and the O-ring 21. Further, an external conductor 23 serving as another electric path is connected to one side surface of the conductor 22.
[0026]
A cylindrical guide tube 24 made of a fluorine-based resin insulating material is provided around the second movable energizing shaft 19, and one end thereof is fixed to the conductor 22 with a bolt 25. The guide cylinder 24 is provided so that the second movable energizing shaft 19 can move slidably in the cylinder and can move linearly in the axial direction.
[0027]
Around the contact 18, the second movable energizing shaft 19, the guide cylinder 24, and the like, a third insulation molded with an insulation material such as epoxy resin having a space 26 having one end opened in a cylindrical shape. The layer 27 is provided so as to expose the end of the outer conductor 23. In the space 26, the contact 18, the second movable energizing shaft 19, the guide cylinder 24 and the like are arranged. Further, at the open end of the third insulating layer 27, an interface portion 27a formed in a tapered shape to increase a creepage distance for insulation and a flange portion 27b protruding in a radial direction for supporting and fixing are provided. Is formed. Note that a shield 28 for easing the electric field is embedded in the third insulating layer 27.
[0028]
The open end of the second insulating layer 16 and the open end of the third insulating layer 27 are interface-connected to the interface portions 16a and 27a via a flexible member 29 such as silicon rubber. Flange portions 16b and 27b are fixed by bolts 30. As a result, the space portions 15 and 26 are combined to form a cylindrical closed disconnection space portion 31, and the contacts arranged in the disconnection space portion 31 facing each other and forming the second pair of contacts. 12 and 18 will be stored.
[0029]
The dry air cylinder is inserted into the disconnection space 31 through an insulating pipe 32 embedded in the first insulating layer 10 and provided on one side of the metal cylinder 7 and a valve 33 for opening and closing the insulating pipe 32. From 34, dry air is sealed. For this purpose, after the inside of the disconnection space 31 is once evacuated, dry air is sealed up to approximately atmospheric pressure. After sealing, the valve 33 is closed and the dry air cylinder 34 is removed.
[0030]
The operation unit 1c is provided with an insulating operation rod 35 connected to the other end of the second movable energized shaft 19 in the axial direction. Around the insulating operation rod 35, a fourth insulating layer 36 molded with an insulating material such as epoxy resin having one open end is provided integrally with the third insulating layer 27. I have. An insulating operation rod 35 is disposed in a space formed in the insulating layer 27, and an open end is fixed to the operation mechanism 1d.
[0031]
The operating mechanism 1d is provided with an operating mechanism 37, for example, an electromagnetic solenoid mechanism connected to the insulating operating rod 35.
[0032]
In this operating mechanism 37, an operating force is obtained from a magnetic flux of a permanent magnet or the like, and the operating force is set to be larger than a spring force for compressing the open circuit spring 8. That is, the operating force of the operating mechanism 37 is set to about 1.2 times the spring force of the open-circuit spring 8 so that the open-circuit spring 8 can be easily compressed and stored by the operating force. Although the operating force may be higher than that, it is not preferable because the vacuum valve 4 and the first insulating layer 10 must have a structure that can withstand the operating force.
[0033]
In addition, the stored open-circuit spring 8 is released, and the speed at which the second movable energizing shaft 19 moves by the operation mechanism 37 is slightly lower than the speed at which the open-circuit spring 8 extends. For example, if the speed at which the contacts (first pair of contacts) 2 and 3 of the vacuum valve 4 are opened is 1.2 m / s obtained from the speed at which the open circuit spring 8 is released and extended, the second speed is obtained. The moving speed of the movable energizing shaft 19 is reduced to 1 m / s.
[0034]
The blocking unit 1a and the disconnecting unit 1b configured as described above operate in two stages as shown in FIG. That is, from the time t0 to the time t1, both the blocking unit 1a and the disconnecting unit 1b are in the closed state with the open circuit spring 8 being charged.
[0035]
Then, when a shutoff command is issued and the operating mechanism 37 operates to move the second movable energizing shaft 19, the second movable shaft 11 also follows and moves simultaneously with the force that the open circuit spring 8 tries to release. I do. For this reason, until the time t2, the disconnecting portion 1a is first opened while the disconnecting portion 1b remains closed. Here, the second movable shaft 11 and the first movable shaft 6 are connected and move integrally.
[0036]
Further, when the second movable energizing shaft 19 continues to move and the open-circuit spring 8 is completely released, the second movable shaft 11 stops moving and only the second movable energizing shaft 19 moves. Therefore, after the time t2, the disconnecting portion 1b is opened together with the disconnecting portion 1a.
[0037]
That is, in the opening of the interrupting portion 1a and the disconnecting portion 1b, there is an order in which the interrupting portion 1a is opened first, and then the disconnecting portion 1b is opened, and a time difference from time t1 to time t2 occurs. This time difference is obtained from the difference between the speed at which the open-circuit spring 8 extends and the speed at which the second movable energizing shaft 19 moves.
[0038]
Conversely, when closing the disconnecting portion 1a and the disconnecting portion 1b, if the operating mechanism 37 in the open state is operated, the second movable energizing shaft 19 moves to close the disconnecting portion 1b. Then, the second movable current-carrying shaft 19 and the second movable shaft 11 move together and move together to accumulate the open-circuit spring 8 and close the blocking unit 1a.
[0039]
According to the opening / closing device of the present invention, the blocking unit 1a and the disconnecting unit 1b are arranged in the axial direction and are continuously opened / closed by the common operating mechanism 37. The opening and closing are performed in the order in which the poles and then the disconnecting section 1b are opened, and when the poles are closed, the disconnecting section 1b is closed and then the interrupting section 1a is closed. Accordingly, it is not necessary to add an interlock mechanism for controlling the open / close state of each other, and the operation mechanism 37 can have a simple structure.
[0040]
It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the spirit of the invention. In the embodiment of the present invention, dry air is sealed in the space 31 of the disconnecting portion 1b at substantially the atmospheric pressure. However, if this is pressurized, the insulation characteristics are improved. 18 can be reduced. Further, another insulating medium such as nitrogen gas or SF6 gas may be sealed.
[0041]
Further, an insulating medium such as silicon oil or a fluorine-based inert liquid can be injected into the space 31.
[0042]
Further, if a sufficient distance between the contacts 12 and 18 can be ensured, a plurality of insulating rods may be used to fix and support the intercepting portion 1a and the operating portion 1c, and the space between the contacts 12 and 18 may be in the air.
[0043]
【The invention's effect】
As described above, according to the present invention, the blocking unit and the disconnecting unit are arranged in the axial direction and are continuously opened and closed by the common operation mechanism. It is not necessary to add a lock mechanism or the like, and the operation mechanism can have a simple structure.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a switchgear according to an embodiment of the present invention.
FIG. 2 is a view for explaining the operation of a blocking unit and a disconnecting unit according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Opening-closing device 1a Shut-off part 1a1 Vacuum valve part 1a2 Open-circuit spring part 1b Disconnect part 1b1 First movable part 1b2 Second movable part 1c Operation part 1d Operation mechanism part 2, 3 contacts (first pair of contacts)
4 Vacuum valve 5 Fixed energizing shaft 6 First movable shaft 7 Metal cylinder 8 Open circuit spring 9 Disk 10 First insulating layer 11 Second movable shaft (first movable energizing shaft)
12, 18 contacts (second pair of contacts)
13, 24 Guide cylinder 14, 25, 30 Bolt 15, 26 Space 16 Second insulating layer 16a, 27a Interface 16b, 27b Flange 17, 28 Shield 19 Second movable energizing shaft 20 Contact 21 O-ring 22 Conductor 23 Outer conductor 27 Third insulating layer 29 Flexible member 31 Disconnect space 32 Insulating pipe 33 Valve 34 Dry air cylinder 35 Insulating operating rod 36 Fourth insulating layer 37 Operating mechanism

Claims (4)

A vacuum valve having a first pair of contacts that can be freely contacted and detached, and a blocking portion including an open-circuit spring portion connected to a movable shaft of the vacuum valve so as to open the first pair of contacts;
A first movable energized shaft connected to the movable shaft, and a second movable energized shaft disposed axially opposite to the first movable energized shaft, which are fixed to opposing ends thereof and are freely movable. A disconnecting portion having a second pair of contacts of
An operating mechanism connected to the second movable energizing shaft;
The operating force of the operating mechanism is greater than the spring force of the open-circuit spring portion,
Due to the operation of the operating mechanism, at the time of opening, the movement of the second movable energized shaft is made to follow the movement of the second movable energized shaft by the biasing force of the open-circuit spring, and the first movable energized shaft is simultaneously moved, and then, firstly cut off. After the stop of the movement of the first movable energized shaft, the second movable energized shaft is continuously moved to open the disconnection portion. The disconnecting section is closed by moving the second movable energizing axis, and then the breaking section is closed by moving the second movable energizing axis and the first movable energizing axis. And switchgear. 2. The opening and closing device according to claim 1, wherein a speed at which the second movable energized shaft connected to the operation mechanism moves is slower than a speed at which the open-circuit spring is released. 3. The said disconnecting part and the said interrupting | blocking part were molded with an insulating material so that a space part might be formed between the 2nd pair of contact points of the said disconnecting part, The Claim 1 or Claim 2 characterized by the above-mentioned. Switchgear. The switchgear according to claim 3, wherein an insulating medium is sealed and sealed in the space.

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