JP4365620B2 - Switchgear - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an opening / closing device provided in an electric power system, and more particularly to an opening / closing device capable of simplifying an operation mechanism for opening / closing a blocking portion and a disconnecting portion.
[0002]
[Prior art]
In the power system, switchgears such as circuit breakers and disconnectors are provided, the circuit breaker is responsible for interrupting large currents such as circuit fault currents, and the disconnector is responsible for completely opening the circuit. is doing.
[0003]
Since conventional circuit breakers and disconnectors have different responsibilities, they are each configured as a single switchgear. The circuit breaker is opened / closed by an operating mechanism dedicated to the circuit breaker, and the disconnecting switch is opened / closed by an operating mechanism dedicated to the disconnecting switch (see, for example, Patent Document 1).
[0004]
When opening these switchgears, an interlock mechanism is first added to open the circuit breaker and then open the disconnector. In the case of a closed pole, the disconnector is closed and then the breaker is closed.
[0005]
On the other hand, a configuration has been proposed in which the operation mechanism is shared and the responsibility of the circuit breaker and the disconnecting device is performed by the same vacuum insulating container (for example, see Patent Document 2). This is because the operation mechanism is operated in two stages by providing a pair of contact points that can be contacted and separated in the vacuum insulation container, and the disconnecting position that opens from the cutting position and the entering position where the pair of contacts come into contact with each other. The position is formed.
[0006]
And it has the responsibility of a circuit breaker in an entrance position and a cutting position, and has the responsibility of a disconnector in a disconnection position. For this reason, the operation mechanism performs a first operation for forming an entry position and a cutting position, and a second operation for forming a disconnection position from the cutting position.
[0007]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 11-185577 (5th page, FIG. 1)
[0008]
[Patent Document 2]
Japanese Unexamined Patent Publication No. 2000-164084 (page 15, FIG. 1)
[0009]
[Problems to be solved by the invention]
The above conventional switchgear has the following problems.
[0010]
In the case where the breaker and the disconnector are provided independently, an interlock mechanism for controlling the operation of each other from the state of the operation mechanism must be added, and the operation mechanism becomes complicated. In other words, the disconnector is provided with an interlock mechanism that can be opened and closed only when the circuit breaker is open, and the circuit breaker can be closed only when the disconnector is closed. . If the disconnecting switch is opened earlier than the circuit breaker, the disconnecting switch has no responsibility for disconnection, so that the arc diffuses and cannot be interrupted.
[0011]
In addition, if the operation mechanism is shared and the responsibility of the breaker and disconnector is performed in the same vacuum insulated container, for example, when opening the circuit, the operation mechanism operates in the order of disconnection and then disconnection. It can't happen. However, this operating mechanism has to be operated in two stages and is complicated. In other words, 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 entire shape of the operation mechanism becomes large.
[0013]
Accordingly, an object of the present invention is to provide an opening / closing device that can perform opening and closing and disconnecting in order using a vacuum valve in order and simplify an operation mechanism for operating them.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the opening / closing device of the present invention comprises a vacuum valve having a first pair of contacts that can be contacted and separated, and a movable shaft of the vacuum valve so as to open the first pair of contacts. An interrupting portion comprising an open spring portion coupled to the first movable energizing shaft coupled to the movable shaft, and a second movable energizing shaft disposed oppositely in the axial direction of the first movable energizing shaft. A disconnecting portion having a second pair of contactable and separable contacts fixed to opposite end portions, and an operating mechanism connected to the second movable energizing shaft, and the movable shaft of the blocking portion And the first movable energizing shaft and the second movable energizing shaft of the disconnecting portion and the insulating operating rod shaft of the operating mechanism are arranged in a line, and the operating mechanism is more than the spring force of the open spring portion. The opening force of the opening spring portion is increased. The opening speed of the operating mechanism is made slower than the opening speed, and the movement of the second movable energizing shaft is caused to follow the movement of the second movable energizing shaft by the biasing force of the opening spring by the operation of the operating mechanism. The movable energizing shafts are simultaneously moved, then the blocking portion is first opened, and then the second movable energizing shaft is continuously moved after the movement of the first movable energizing shaft is stopped. In the closed state, the second movable energizing shaft is first moved to close the disconnection portion, and then the second movable energizing shaft and the first movable energizing shaft are moved. And the blocking part is closed.
[0015]
According to such a configuration, since the blocking portion and the disconnecting portion are continuously opened and closed by the common operation mechanism, it is not necessary to add an interlock mechanism for controlling the mutual opening / closing state. In addition, the operation mechanism can have a simple structure.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a switchgear according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining the operation of a blocking part and a disconnecting part according to an embodiment of the present invention.
[0017]
As shown in FIG. 1, the switchgear 1 according to the present invention includes a blocking portion 1a arranged on a line from the upper side to the lower side in the drawing, a disconnecting portion 1b connected in series to the blocking portion 1a, and the disconnecting portion 1a and the disconnecting portion. The operation unit 1c is configured to continuously open and close the unit 1b, and the operation mechanism unit 1d connected to the operation unit 1c. And the said interruption | blocking part 1a, the disconnection part 1b, and the operation part 1c are comprised by connecting each insulating layer 10, 16, 27, and 36 mentioned later for details.
[0018]
The blocking portion 1a is configured by being divided into a vacuum valve portion 1a1 and an open spring portion 1a2.
[0019]
The vacuum valve portion 1a1 is provided with a vacuum valve 4 having a pair of contacts (first pair of contacts) 2 and 3 that can be 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 electric circuit, and the movable side is in contact with and away from the contact 2 at the inner end of the vacuum valve 4 of the first movable shaft 6. The contact 3 is fixed.
[0020]
The open spring part 1a2 is provided with a cylindrical metal cylinder 7, one end is fixed in the axial direction of the vacuum valve 4, and the other end is opened. An open spring 8 is provided in the metal cylinder 7 so as to surround the first movable shaft 6, and the open spring 8 is a circle fixed to the shaft 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, an end portion of the fixed energizing shaft 5 is exposed, and a first insulating layer 10 molded with an insulating material such as an epoxy resin is formed.
[0022]
The disconnecting portion 1b is configured by being divided into a first movable portion 1b1 and a second movable portion 1b2.
[0023]
The first movable portion 1b1 is provided with a second movable shaft 11 connected and fixed in the axial direction of the first movable shaft 6. The first movable shaft 6 and the second movable shaft 11 A first movable energizing shaft is configured. A contact 12 is fixed to the 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 the open end of the metal tube 7 with a bolt 14. . The guide tube 13 is provided so that the second movable shaft 11 can be slidably moved in the tube and can move linearly in the axial direction.
[0024]
Around the contact 12, the second movable shaft 11, the guide cylinder 13, and the like, a second insulating layer molded with an insulating material such as an epoxy resin having a space portion 15 having one end opened in a cylindrical shape. 16 is integrated with the first insulating layer 10. In the space 15, the contact 12, the second movable shaft 11, the guide cylinder 13, and the like are disposed. Further, at the open end of the second insulating layer 16, there are an interface portion 16a formed in a taper shape for taking a large creepage distance for insulation, and a flange portion 16b protruding in the radial direction for supporting and fixing. Is formed. Note that a shield 17 for electric field relaxation 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 and 18 that can be separated from each other is formed to constitute a second pair of contacts. The contact 18 is fixed to the end of the second movable energizing shaft 19 disposed in the axial direction of the second movable shaft 11. Further, the second movable energizing shaft 19 slidably penetrates the central portion of the cylindrical conductor 22 via the contact 20 and the O-ring 21. Further, an outer conductor 23 serving as another electric circuit is connected to one side surface of the conductor 22.
[0026]
A cylindrical guide tube 24 made of a fluororesin 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 be slidably moved in the cylinder and linearly moved in the axial direction.
[0027]
Around the contact 18, the second movable energizing shaft 19, the guide cylinder 24, etc., a third insulation molded with an insulating material such as an epoxy resin having a space portion 26 having one end opened in a cylindrical shape. A layer 27 is provided with the end of the outer conductor 23 exposed. And in this space part 26, the contact 18, the 2nd movable electricity supply shaft 19, the guide cylinder 24, etc. are arrange | positioned. In addition, at the open end of the third insulating layer 27, there are an interface portion 27a formed in a taper shape for taking a large creepage distance for insulation, and a radially protruding flange portion 27b for supporting and fixing. Is formed. A shield 28 for electric field relaxation 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, and are connected to each other. The flange portions 16 b and 27 b are fixed with bolts 30. As a result, the space portions 15 and 26 are combined to form a cylindrical sealed disconnect space portion 31, and the contact points arranged opposite to each other that constitute the second pair of contacts in the disconnect space portion 31. 12 and 18 are stored.
[0029]
In the disconnect space 31, a dry air cylinder is provided 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 that opens and closes the insulating pipe 32. Dry air is sealed from 34. In this case, after the inside of the disconnection space portion 31 is evacuated, the dry air is sealed up to approximately atmospheric pressure. After the sealing, the valve 33 is closed and the dry air cylinder 34 is removed.
[0030]
The operation portion 1 c is provided with an insulating operation rod 35 connected to the other axial end portion of the second movable energizing shaft 19. Around the insulating operation rod 35, a fourth insulating layer 36 molded with an insulating material such as an epoxy resin having one end opened is provided integrally with the third insulating layer 27. Yes. An insulating operation rod 35 is disposed in the space formed in the insulating layer 36 , and the open end is fixed to the operation mechanism portion 1d.
[0031]
The operation mechanism portion 1d is provided with an operation mechanism 37 composed of, for example, an electromagnetic solenoid mechanism connected to the insulating operation rod 35.
[0032]
In this operation mechanism 37, an operation force can be obtained from a magnetic flux such as a permanent magnet, but the operation force is set larger than the spring force for compressing the open spring 8. That is, the operating force of the operating mechanism 37 is about 1.2 times the spring force of the open spring 8 so that the open spring 8 can be easily compressed and stored with the operating force. It should be noted that the operating force may be greater than this, but it is not preferable because the vacuum valve 4, the first insulating layer 10, and the like must have a structure that can withstand the operating force.
[0033]
The stored open spring 8 is released, and the speed at which the second movable energizing shaft 19 moves by the operating mechanism 37 is slightly slower than the speed at which the open spring 8 extends. For example, if the speed at which the contact (first pair of contacts) 2 and 3 of the vacuum valve 4 opens is 1.2 m / s obtained from the speed at which the open spring 8 is released and extended, the second The moving speed of the movable energizing shaft 19 is reduced to 1 m / s.
[0034]
The blocking section 1a and the disconnecting section 1b configured as described above are operated in two stages as shown in FIG. That is, from time t0 to time t1, both the breaking portion 1a and the breaking portion 1b are in a closed state with the open spring 8 being stored.
[0035]
Then, when a shut-off command is issued and the operation 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 spring 8 tries to release. To do. For this reason, until the time t2, the disconnecting portion 1b remains closed and the blocking portion 1a is first opened. Here, the 2nd movable shaft 11 and the 1st movable shaft 6 are connected, and move integrally.
[0036]
When the second movable energizing shaft 19 continues to move and the open spring 8 is completely released, the second movable shaft 11 stops moving and only the second movable energizing shaft 19 moves. For this reason, after time t2, the disconnecting portion 1b is opened together with the blocking portion 1a.
[0037]
That is, in the opening of the breaking part 1a and the disconnecting part 1b, the breaking part 1a is first opened and then the disconnecting part 1b is opened, and a time difference from time t1 to t2 occurs between these. This time difference is obtained from the difference between the speed at which the open spring 8 extends and the speed at which the second movable energizing shaft 19 moves.
[0038]
Conversely, when closing the blocking 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 and the disconnecting portion 1b is closed. Then, the second movable energizing shaft 19 and the second movable shaft 11 are united and moved simultaneously to accumulate the open spring 8 and close the blocking portion 1a.
[0039]
According to the switchgear of the present invention, since the blocking portion 1a and the disconnecting portion 1b are arranged in the axial direction and continuously opened and closed by the common operation mechanism 37, the blocking portion 1a is first opened at the time of opening. Then, the disconnection portion 1b is opened in the order of opening, and the closing portion 1b is closed at the time of closing, and then the blocking portion 1a is closed. Thereby, 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]
In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of invention, it can change and implement variously. In the embodiment of the present invention, the description has been given by enclosing dry air at approximately atmospheric pressure in the space portion 31 of the disconnecting portion 1b. However, if this is pressurized, the insulating characteristics are improved, so the space portion 31 and the contact 12, The distance between 18 can be reduced. Moreover, you may enclose other insulating media like nitrogen gas and SF6 gas.
[0041]
Furthermore, an insulating medium such as silicon oil or a fluorine-based inert liquid can be injected into the space 31.
[0042]
Furthermore, if the distance between the contacts 12 and 18 can be sufficiently secured, the gap between the blocking portions 1a and the operating portion 1c may be fixed and supported by a plurality of insulating rods, 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 portion and the disconnecting portion are arranged in the axial direction, and these are continuously opened and closed by a 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 cross-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 part and a disconnecting part according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Switchgear 1a Blocking part 1a1 Vacuum valve part 1a2 Opening spring part 1b Disconnecting part 1b1 First movable part 1b2 Second movable part 1c Operating part 1d Operating mechanism part 2, 3 Contact (first pair of contacts)
4 Vacuum valve 5 Fixed energizing shaft 6 First movable shaft 7 Metal cylinder 8 Opening spring 9 Disc 10 First insulating layer 11 Second movable shaft (first movable energizing shaft)
12, 18 contacts (second pair of contacts)
13, 24 Guide cylinders 14, 25, 30 Bolts 15, 26 Space portion 16 Second insulating layer 16a, 27a Interface portion 16b, 27b Flange portion 17, 28 Shield 19 Second movable energizing shaft 20 Contact 21 O-ring 22 Conductor 23 External conductor 27 Third insulating layer 29 Flexible member 31 Disconnection space 32 Insulating pipe 33 Valve 34 Dry air cylinder 35 Insulating operation rod 36 Fourth insulating layer 37 Operating mechanism

Claims (2)

A vacuum valve having a first pair of contactable and separable contacts, and a blocking portion comprising an open spring portion connected to a movable shaft of the vacuum valve so as to open the first pair of contacts;
The first movable energizing shaft connected to the movable shaft and the second movable energizing shaft arranged opposite to each other in the axial direction of the first movable energizing shaft are fixed to the end portions facing each other. A disconnecting portion having a second pair of contacts;
An operating mechanism coupled to the second movable energizing shaft,
The movable shaft of the blocking portion , the first movable energizing shaft and the second movable energizing shaft of the disconnecting portion , and the insulating operation rod shaft of the operation mechanism are arranged on a line,
And while making the operating force of the operating mechanism larger than the spring force of the opening spring part, the opening speed of the operating mechanism is made slower than the speed at which the opening spring of the opening spring part extends,
Due to the operation of the operation mechanism, at the time of opening, the first movable energization shaft is moved simultaneously by causing the second movable energization shaft to follow the movement of the open spring and simultaneously moving the first movable energization shaft. The first movable energizing shaft is stopped, and then the second movable energizing shaft is continuously moved so as to open the disconnection portion. The disconnecting portion is closed by moving the second movable energizing shaft, and then the blocking portion is closed by moving the second movable energizing shaft and the first movable energizing shaft. Opening and closing device. The disconnecting part and the blocking part are molded with an insulating material so that a space is formed between the second pair of contacts of the disconnecting part,
2. The switchgear according to claim 1, wherein the open ends of the respective insulating layers are interface-connected.

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