JP2008166161A - Gas circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an inexpensive gas circuit breaker in which breaking characteristics and a phase control function are improved. <P>SOLUTION: A phase control valve device is installed between a heat buffer device of the gas circuit breaker and an arc region between opening/fitting contacts, and opened by a timing based on a phase of a breaking current, and a gas pressure in the heat buffer device is made to be maintained even at a current zero. The phase control valve device is equipped with an annular plate member which moves in the axial direction or the peripheral direction, and opens and closes an opening of a gas communicating passage, and the annular plate member may be a check valve by biasing the gas passage opening to be closed all the time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas circuit breaker that controls the timing of arc-extinguishing gas blowing by phase control.

  In the conventional phase control gas circuit breaker, for example, as described in Patent Document 1, in a period in which the gas pressure in the pressure accumulating space inside the circuit breaker body rises above a threshold set according to the type of gas, An opening command setting device is provided that gives an opening command for the circuit breaker body at a timing such that the current zero point to be interrupted is reached.

JP 2000-67712 A

  In such a phase control gas circuit breaker, the operation device necessary to open the gas circuit breaker is configured to use arc extinguishing gas in a pressure accumulating space called a puffer inside the main body by heat input from the arc. It is realized by performing compression against the pressure reaction force, and it is necessary to use an operation device having a large operation force in order to control the pressure against such reaction force. However, it is considered that such an operating device has a large drive variation, and it is difficult to control them in synchronization with the current phase by keeping them small, and the circuit breaker is usually a three-phase circuit breaker. In order to perform such high-precision control, three large-sized high-precision operation devices that drive each phase independently are required.

  In addition, it has no mechanical puffer, which is a pressure accumulating space for mechanical compression by the operating device, and has only a thermal puffer that accumulates pressure only by arc heat, or interrupts a small current as an auxiliary means to the heat puffer. For a gas circuit breaker that uses a mechanical puffer that is used only when the pressure is applied, the pressure fluctuates due to changes in the arc current over time. It has been difficult to control in terms of holding and releasing the pressure at the current zero point.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an inexpensive gas circuit breaker with improved shut-off performance and phase control function.

The gas circuit breaker according to the present invention includes a sealed container filled with an insulating gas, a first contact provided in the sealed container, and an arc region between the first contact and the first contact. A second contact to be formed; an operating device for relatively driving and separating the second contact; a nozzle surrounding the arc region; and the nozzle communicated with the nozzle, and the arc is supplied to the insulating gas at the time of opening. In a gas circuit breaker comprising a puffer device that blows on an arc in a region and an opening command device that generates an opening command when a current to be interrupted is generated,
A phase control valve device provided between the puffer device and the arc region;
A phase control valve that opens the phase control valve device at a timing based on the phase of the cut-off current so that the pressure of the insulating gas in the puffer device is maintained at a pressure effective for extinction even at a current zero point. A gas circuit breaker comprising an apparatus operating device.

  According to this invention, since the phase control valve that opens and closes in synchronization with the current phase of the system is provided at the gas outlet from the pressure accumulating space of the gas circuit breaker to the arc, it is necessary to interrupt the pressure in the pressure accumulating space. It has an effect of temporal control such that it is maintained as a sufficient pressure until the current zero point and is released at the current zero point.

Embodiment 1 FIG.
1 to 3 show an embodiment of a gas circuit breaker according to the present invention, FIG. 1 is a schematic view showing the whole of the gas circuit breaker, and FIG. 2 shows the details of the gas circuit breaker main body of FIG. FIG. 3 is a schematic sectional view, and FIG. 3 is a graph for explaining the operation of the gas circuit breaker of FIG.

  In FIG. 1, the gas circuit breaker of the present invention includes a gas circuit breaker body 1, a current detector 2 that detects a current of a conductor to which the gas circuit breaker body 1 is connected, and a current detection result from the current detector 2. Accordingly, an opening command device 3 that generates an opening command when a current to be interrupted is generated.

  The gas circuit breaker body 1 includes a sealed container 4 filled with an insulating gas, a first contact 5 that is a fixed contact provided in the sealed container 4, and a first contact 5 that is separated from the fixed first contact 5. In response to the opening command from the opening command device 3, the second contact 7 that is a movable contact that forms the arc region 6, the movable second contact 7 is driven to be separated from the fixed first contact 5. An operating device 8 that is closed and connected by, for example, restoration work, and a phase control valve device 9 that operates in response to an operation command from the opening command device 3 and is opened at a timing based on the phase of the cutoff current; It has.

  In FIG. 2, the gas circuit breaker main body 1 is connected to the nozzle 11 surrounding the arc region 6 and is connected to the movable second contact 7 and operates together. And a puffer device 13 for spraying the arc 12 formed between the first and second contacts 5 and 7 opened inside.

  A phase control valve device 9 is provided between the puffer device 13 and the arc region 6, and the phase control valve device 9 opens at a timing based on the phase of the cutoff current (see FIG. 1). As will be described in detail later, the pressure of the insulating gas in the puffer device 13 is maintained at a pressure effective for arc extinction even at a current zero point.

  In the puffer device 13, a substantially annular second contact 7 that is separated from and in contact with the rod-shaped first contact 5 is supported by a hollow cylindrical tube 15, and the hollow cylindrical tube 15 has a diameter larger than that of the hollow cylindrical tube 15. It is enlarged and connected to and supported by a cylindrical accumulator 17 having an accumulator space 16 formed therein. A hollow cylindrical guide 18 is provided outside the second contact 7 and the hollow cylindrical tube 15 and is connected to the pressure accumulating vessel 17. Since the guide 18 and the pressure accumulating container 17 are fixed to each other and communicate with each other, it can be said that the second contact 7 is supported by the hollow cylindrical tube 15 inside the guide 18 communicating with the pressure accumulating space 16.

  A cylinder 20 that is a hollow cylindrical member supported by an annular partition wall 19 is provided outside the guide 18 and the pressure accumulating container 17 that are connected to each other in this manner. An annular space is formed around the pressure accumulating vessel 17 on the side farther from the contacts 5 and 7 with respect to the partition wall 19 of the cylinder 20, and an annular piston 21 is inserted therein, and a mechanical puffer chamber 22 is formed therein. Is formed. The piston 21 is supported by a fixed support structure (not shown) by a rod 23, and is fixed while the cylinder 20 moves with the second contact 7.

  A heat puffer chamber 24 is formed around the guide 18 in a portion extending from the partition wall 19 of the cylinder 20 to the contact side. An annular end wall 26 extends from the cylindrical wall 25 of the cylinder 20 to the inner side in the circumferential direction at a portion close to the contact 7 of the cylinder 20, and is an annular outlet between the inner peripheral edge of the end wall 26 and the guide 18. An opening 27 is formed. The nozzle 11 is also connected to the inner peripheral edge of the end wall 26, and has an opening 27 between the guide 18 and the nozzle 11, and a communication passage 28 that communicates the heat puffer chamber 24 to the arc region 6 in the nozzle 11. Is formed.

  The puffer device 13 further includes a check valve 29 that allows the heat puffer chamber 24 and the mechanical puffer chamber 22 to communicate with each other, and the pressure of the insulating gas in the mechanical puffer chamber 22 is compressed by the piston 21 to become a predetermined value or more. When this occurs, the insulating gas in the mechanical puffer chamber 22 can flow into the heat puffer chamber 24.

  The pressure accumulation space 16 extending through the second annular contact 7 and communicating with the arc region 6 communicates with the heat puffer chamber 24 via the check valve 30. Further, the pressure accumulating container 17 has a pressure regulating valve 31 in the back so that the pressure in the pressure accumulating space 16 can be adjusted.

  The phase control valve device 9 includes an annular plate member 35 extending along the end wall 26 of the cylinder 20 so as to close the annular opening 27 between the end wall 26 and the guide 18. The annular plate member 35 slides in the axial direction on the guide 18 at the inner peripheral edge portion, and opens and closes the communication passage 28 by being separated from the opening portion 27 from the inside of the heat puffer chamber 24 at the outer peripheral edge portion. is there. The phase control valve device 9 is connected to an annular plate member 35 at one end, extends movably through the end wall 26 in the axial direction, and the other end protrudes outside the heat puffer chamber 24. And an electromagnetic drive device 37 for driving the rod 36 in the axial direction.

  In the gas circuit breaker configured as described above, the generation of the current to be interrupted is detected by the current detector 2, and the opening command device 3 issues a disconnect command to the operating device 8 of the gas circuit breaker body 1. The operating device 8 opens the second contact 7 from the first contact 5 and simultaneously drives the puffer device 13 to heat the puffer chamber 24, the nozzle 11, the guide 18, the hollow cylindrical tube 15, the pressure accumulating space 16, and the check valve. 30, the pressure adjusting valve 31, the cylinder 20 as a puffer cylinder, the phase control valve device 9 and the check valve 29 are integrally driven.

  When the second contact 7 and the first contact 5 are separated, an arc 12 is generated between them. Heat from the arc 12 passes through the inside of the second contact 7 and flows into the pressure accumulation space 16 through the hollow cylindrical tube 15. Since the pressure in the pressure accumulating space 16 rises and becomes higher than the pressure in the heat puffer chamber 24, the check valve 30 opens and the gas flows into the heat puffer chamber 24. Excessive pressure increase is controlled by the operating pressure of the pressure regulating valve 31. As the gas flows into the heat puffer chamber 24, the pressure in the heat puffer chamber 24 also increases. When the current to be cut off is a cut-off current value of a certain level or higher, the pressure is higher than the gas compressed in the mechanical puffer chamber 22, and in this case, the check valve 29 is not opened.

  Therefore, the force for compressing the internal gas in the mechanical puffer chamber 22 may be smaller than that in the case where heat flows into the mechanical puffer chamber 22 due to the absence of the check valve 29. Conversely, when the cut-off current value is below a certain level, the pressure in the thermal puffer chamber 24 can be assisted by the pressure in the mechanical puffer chamber 22.

  By the way, in the process in which the alternating current decreases beyond the peak in the half cycle, the inflow of heat from the arc 12 to the pressure accumulating space 16 becomes small and the pressure in the pressure accumulating space 16 starts to decrease. When the pressure in the pressure accumulating space 16 becomes smaller than the pressure in the heat puffer chamber 24, the check valve 30 closes and the pressure in the heat puffer chamber 24 does not decrease. Will be greeted. When the electromagnetic drive device 37 drives the annular plate member 35 and opens the phase control valve device 9 in response to an operation command from the phase control device 14 as described below, the arc-extinguishing gas is caused by the high pressure in the heat puffer chamber 24. Flows out of the communication path 28 through the opening 27 and is blown to the arc 12, and the arc is extinguished at the current zero point.

  On the other hand, the phase control device 14 includes a programmable microcomputer inside, obtains an amplitude, a phase, a direct current component and the like from the alternating current data obtained from the current detector 2 to obtain a current waveform, The timing of the current zero point is predicted by predicting the timing of the current zero point, and detecting the time position of the current zero point that comes every half cycle, etc. The operation of opening the valve is started from the time required for opening the phase control valve device 9 or the time required for the flow of spraying from the nozzle outlet to the arc 6 through the outlet to be sufficient for arc extinction. A timing for outputting the command is obtained, and a command to open the valve is output to the electromagnetic drive device 37 when the timing is reached.

  With this configuration, the phase control valve device 9 can be driven in synchronization with the current phase, so that the pressure in the heat puffer chamber 24 can be maintained as much as necessary for shutting off as shown in FIG. And a gas circuit breaker with improved arc extinguishing performance can be obtained.

  Moreover, if the arc-extinguishing chamber provided with such a phase control valve device 9 is used for three phases, only one operating device 8 may be provided for three arc-extinguishing chambers. By providing only a small electromagnetic driving device 37 for driving each phase, it is possible to obtain a circuit breaker with high arc extinguishing performance at each current zero point of each phase.

  By the way, the pressure accumulating space 16 is shown in FIG. 1 with a size comparable to that of the heat puffer chamber 24. However, if the required pressure is obtained, the pressure accumulating space 16 may have the same diameter as the hollow cylindrical tube 15 or the guide 18. Good. Further, when there is no excessive pressure increase due to the breaking current rating to which the breaker is applied, the pressure regulating valve 31 may not be provided. Further, when a sufficient arc extinguishing performance can be obtained even with a small current interruption with only the pressure of the heat puffer chamber 24, the mechanical puffer chamber 22 is not necessary, and the piston 21 that is a puffer piston is not necessary.

  As described above, according to the present invention, the phase control valve device 9 that opens and closes the opening 27 of the gas flow path from the pressure accumulation space 16 of the gas circuit breaker body 1 to the arc 12 in synchronization with the current phase of the system. Therefore, as shown in FIG. 3, the pressure in the pressure accumulating space can be controlled temporally such that the pressure is maintained as a sufficient pressure necessary for interruption until the current zero point, and the pressure is released at the current zero point. Since a sufficient pressure for extinguishing the arc can be maintained in the puffer chamber at the current zero point, an inexpensive gas circuit breaker with improved interruption performance and phase control function can be obtained.

Embodiment 2. FIG.
In the gas circuit breaker body 1 shown in FIG. 4, when the hot gas pressure in the arc region 6 becomes higher than the pressure in the heat puffer chamber 24 by the arc 12, the hot gas flows from the arc 12 into the heat puffer chamber 24. The annular plate member 35 can move between a closed position where the opening 27 of the communication path 28 is closed and an open position where the opening 27 is opened regardless of the electromagnetic drive device 37. Yes, the phase control valve device 9 acts as a check valve. Further, the pressure accumulation space 16, the check valve 30, and the pressure regulating valve 31 of FIG. 2 are not provided, and a hollow cylindrical guide 18 is continuously extended. The other structure is the same as that of the gas circuit breaker main body 1 of FIG.

  In the illustrated example, the phase control valve device 9 includes a tension spring 39 that is provided between the end wall 26 of the cylinder 20 and the annular plate member 35 and biases the annular plate member 35 in the direction of closing the opening 27. ing. The connection between the annular plate member 35 and the rod 36 extending from the electromagnetic drive device 37 is such that the annular plate member 35 can move to the right in the figure with respect to the rod 36, but the left in the figure with respect to the rod 36. It cannot be moved in the direction. With such a configuration, when the pressure in the arc region 6 is increased, the tension spring 39 is extended so that the annular plate member 35 is separated from the opening 27 so that high-pressure high-temperature gas can flow into the heat puffer chamber 24. Become. When the pressure in the heat puffer chamber 24 increases and the tension spring 39 acts, the annular plate member 35 is in the closed position.

  Opening and closing by the electromagnetic drive device 37 can be performed irrespective of opening and closing in the check valve action, and may be performed via the tension spring 39, or a driving rod other than the rod 36 may be used. A compression spring can also be used. Thus, in this example, it can be said that the phase control valve device 9 includes a check valve having the spring 39 that biases the annular plate member 35 in the direction in which the opening 27 is always closed. Further, the phase control valve device 9 slides in the axial direction on the guide 18 at the inner peripheral edge, and opens and closes the communication path 28 by being separated from the opening 27 opened in the heat puffer chamber 24 at the outer peripheral edge. It can also be said that the annular plate member 35 is provided.

  In this way, the heat of the arc 12 can be directly taken into the heat puffer chamber 24 from the arc region 6 through the communication path 28, so that the pressure of the heat puffer chamber 24 is increased as in the example shown in FIG. Therefore, there is no need to flow gas from the pressure accumulation space 16 to the heat puffer chamber 24 by the check valve 30. Therefore, the pressure accumulation space 16, the check valve 30, and the pressure regulating valve 31 shown in FIG. 2 are unnecessary, a small arc extinguishing chamber can be formed, and the gas circuit breaker body can be made small.

Embodiment 3 FIG.
FIG. 5 shows another example of the phase control valve device 9 used in the gas circuit breaker body 1. In this example, the opening 27 of the communication passage 28 opened toward the heat puffer chamber 24 of the gas circuit breaker body 1 has a partial opening 41 around the guide 18. The partial openings 41 are a plurality of circular holes that are spaced apart from each other by a distance larger than the diameter of the opening 41 in the circumferential direction. The opening 27 itself may have such a cross-sectional shape, or an annular plate member having an opening 41 that is a circular hole may be attached to the annular opening 27 to form the opening 41 of the opening 27. it can.

  The annular plate member 42 of the phase control valve device 9 has openings 43 of the same number and shape as the openings 41 of the opening portions 27 of the communication passage 28, and the openings 43 of the annular plate member 42 are formed in the openings 41 of the opening portions 27. When overlapped, the arc region 6 and the heat puffer chamber 24 communicate with each other in an open position, and when the openings 41 and 43 are shifted from each other, the opening 27 is closed.

  The movement of the annular plate member 42 between the open position and the closed position is performed by sliding the annular plate member 42 around the guide 18 on the opening 27 of the communication path 28 in the circumferential direction. For this purpose, a drive rod 44 extending in the circumferential direction is connected to the annular plate member 42, and an electromagnetic drive device 37 is connected to the drive rod 44. In the position of FIG. 5, the opening 43 of the annular plate member 42 is located between the openings 41 of the opening 27 and is in a closed position shifted from each other. When the electromagnetic drive device 37 pushes the drive rod 44 rightward in the drawing, the opening 43 of the annular plate member 42 moves clockwise in the circumferential direction and overlaps with the opening 41 of the opening 27, and the opening 27 is opened. Open position.

  In this case, since it is not necessary to open the valve against the pressure of the heat puffer chamber 24, the operating force of the phase control valve device may be small, and the electromagnetic drive device 37 having a smaller force may be used, so that the size is small. The arc-extinguishing chamber can be configured, and the gas circuit breaker body can be made small.

Embodiment 4 FIG.
In the gas circuit breaker main body 1 shown in FIG. 6, the second contact 7 to which the puffer device 13 is attached is a fixed contact, and the first contact 5 is a movable movable contact. For this reason, the operating device 8 is connected to the piston 21 of the puffer device 13 and the first contact 5 that is a movable contact through an operating rod, and the puffer device 13 and the second contact 7 that is a fixed contact are fixed. It is firmly fixed and supported by the structural material.

  In this example, for example, when the operating device 8 starts the opening operation in the gas circuit breaker described with reference to FIGS. 1 to 3, components constituting the puffer device 13 other than the fixed first contact 5 and the piston 21 are provided. Moved together. In the gas circuit breaker main body shown in FIG. 6, on the contrary, the first contact 5 and the piston 21 are driven by the operating device 8. With such a configuration, not only a large force for driving the entire puffer device 13 is unnecessary for the operating device 8, but also the electromagnetic drive device 37 of the phase control valve device 9 is fixed, so that mechanical stability is achieved. Therefore, highly accurate control becomes possible.

  In each of the embodiments described so far, an excellent effect peculiar to each of the embodiments can be obtained in addition to an excellent effect of maintaining a sufficient pressure for extinguishing the arc in the heat puffer chamber 24 at the current zero point. Moreover, although each embodiment was demonstrated as a separate example, it can also use combining each characteristic of each suitably suitably.

It is the schematic of the gas circuit breaker of this invention. It is a schematic sectional drawing which shows embodiment of the gas circuit breaker main body which can be used for the gas circuit breaker of FIG. It is the graph which showed the change of the electric current with the passage of time which shows operation | movement of the gas circuit breaker of FIG. 1, and the change of the pressure in a heat | fever puffer chamber compared with the case where there is no phase control valve apparatus. It is a schematic sectional drawing which shows the example which gave the non-return valve action to the phase control valve apparatus in the gas circuit breaker of this invention. It is the schematic which shows the example which the annular plate member of a phase control apparatus act | operates to the circumferential direction in the gas circuit breaker of this invention. It is a schematic sectional drawing which shows the example which made the contact by the side of the puffer apparatus the fixed side in the gas circuit breaker of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Gas circuit breaker main body, 2 Current detector, 3 Opening command apparatus, 4 Airtight container, 5 1st contact, 6 Arc area | region, 7 2nd contact, 8 Operation apparatus, 9 Phase control valve apparatus, 11 Nozzle, 12 arc, 13 puffer device, 14 phase control valve operating device, 16 pressure accumulating space, 18 guide, 19 partition, 20 cylinder, 21 piston, 22 mechanical puffer chamber, 24 heat puffer chamber, 27 opening, 28 communication path, 30 reverse Stop valve, 35, 42 Annular plate member, 37 Electromagnetic drive device, 39 Spring, 41, 43 Opening.

Claims (9)

A sealed container filled with insulating gas;
A first contact provided in the sealed container;
A second contact that is relatively open to the first contact to form an arc region therebetween;
An operating device for relatively driving and separating the second contact;
A nozzle surrounding the arc region;
A puffer device that communicates with the nozzle and blows the insulating gas onto the arc in the arc region when the electrode is opened;
In a gas circuit breaker provided with an opening command device that generates an opening command when a current to be interrupted is generated,
A phase control valve device provided between the puffer device and the arc region;
A phase control valve that opens the phase control valve device at a timing based on the phase of the cut-off current so that the pressure of the insulating gas in the puffer device is maintained at a pressure effective for extinction even at a current zero point. A gas circuit breaker comprising a device operating device. The puffer device communicates with the arc region through the thermal puffer chamber communicated with the arc region via the phase control valve device, the mechanical puffer chamber communicated with the heat puffer chamber, and the second contact. A pressure accumulating space communicating with the heat puffer chamber via a check valve;
A hollow cylindrical guide surrounding the second contact, and a communication passage having an opening formed in the thermal puffer chamber around the guide and communicating the thermal puffer chamber to the arc region. The gas circuit breaker according to claim 1, characterized in that:   An annular plate member that slides in the axial direction on the guide at the inner peripheral edge, and opens and closes the communication path by being separated from and contacting the opening of the heat puffer chamber at the outer peripheral edge. The gas circuit breaker according to claim 2, wherein the gas circuit breaker is provided. The opening has a partial opening around the guide;
The phase control valve device has an opening corresponding to the opening of the communication path, slides on the communication path in the circumferential direction, and overlaps or shifts the opening to the opening of the opening. The gas circuit breaker according to claim 2, further comprising an annular plate member that opens and closes.   4. The gas circuit breaker according to claim 3, wherein the phase control valve device includes a check valve having a spring that biases the annular plate member in a direction in which the opening is always closed.   A heat puffer chamber in which the puffer device communicates with the arc region via the phase control valve device; a mechanical puffer chamber in communication with the heat puffer chamber; a hollow cylindrical guide surrounding the second contact; The annular plate has an opening formed in the heat puffer chamber around the guide and communicates the heat puffer chamber with the arc region, and the phase control valve device is configured to always close the opening. The gas circuit breaker according to claim 1, further comprising a check valve having a spring for biasing the member.   An annular plate member that slides in the axial direction on the guide at the inner peripheral edge, and opens and closes the communication path by being separated from and contacting the opening of the heat puffer chamber at the outer peripheral edge. The gas circuit breaker according to claim 6, further comprising:   The gas circuit breaker according to any one of claims 1 to 7, wherein the first contact is a fixed side and the second contact is a movable side.   The gas circuit breaker according to any one of claims 1 to 7, wherein the second contact is a movable side, and the first contact is a fixed side.

Images