JP6186432B2 - Operation method of puffer type gas circuit breaker - Google Patents

Description

  The present invention relates to a method for operating a gas circuit breaker, and more particularly to a method for operating a gas circuit breaker using an operation force by magnetic force.

  Patent Document 1 discloses a two-chamber heat puffer type gas circuit breaker that includes a charging puffer chamber filled with an arc extinguishing gas and communicated with a heat puffer chamber via a charging intermediate valve. This charging puffer chamber is formed by a fixed cylinder, a charging piston, and a puffer cylinder, and the arc extinguishing gas filled in the charging puffer chamber is compressed during the charging operation and passes through the gas flow path to the heat buffering chamber. Configured to flow in.

  An object of the present invention is to reduce the temperature of the gas in the heat puffer chamber during the next shut-off operation and improve the shut-off performance by replacing the gas in the heat puffer chamber during the closing operation during the high-speed reclosing shut-off operation. It is said.

JP 2012-94455 A

  In the above invention, a fixed cylinder is provided on the outer periphery of the puffer cylinder, a charging piston is arranged on the puffer cylinder, and the outer periphery of the charging piston is slid or close to the inner surface of the fixed cylinder.

  For this reason, there existed a problem on the design by the structure of the interruption | blocking part movable side becoming complicated, and the problem that it had to consider the influence on the opening-and-closing speed by providing the puffer room for input.

  In view of the above problems, the present invention does not complicate the configuration on the movable side of the cutoff unit, and allows the gas in the heat puffer chamber to be replaced when the cutoff operation is completed with the conventional configuration, thereby enabling the next cutoff operation. The object is to reduce the temperature of the gas in the heat puffer chamber at the time and improve the shut-off performance.

  In order to solve the above problems, a method of operating a puffer-type gas circuit breaker according to the present invention includes a sealed metal container in which an insulating gas is sealed, a stationary contact disposed in the sealed metal container, A volume having a movable contact that contacts with and separates from the fixed contact, and an insulating gas that is released to an arc generated between the fixed contact and the movable contact at the time of opening. A fixed heat puffer chamber, a main circuit conductor electrically connected to the fixed side contactor and the movable side contactor, and the movable side while alternately reversing the N pole and the S pole of a permanent magnet or magnetic body A movable element arranged in the operating direction of the contact and a winding that is arranged opposite to the north and south poles of the movable element and through which a current flows, and an operating force is generated by the magnetic force generated by the winding. A stator for giving an operating force to the movable contact, A circuit breaker operating method comprising: a current detector that detects a current flowing through the main circuit conductor; and a control mechanism that changes an amount of current supplied to the winding in accordance with a current value detected by the current detector. The movable contactor is once operated before being re-inserted from the shut-off completion position.

  According to the present invention, it is possible to replace the gas in the heat puffer chamber after completion of the shut-off operation without changing the configuration of the shut-off unit from the conventional one, and lower the temperature of the gas in the heat puffer chamber during the next shut-off operation And the blocking performance can be improved.

It is sectional drawing which shows an example of the puffer type gas circuit breaker to which the operating method of this invention is applied. It is sectional drawing which shows an example of the actuator 1 unit which implement | achieves the operating method of this invention. FIG. 3 is a perspective view of the actuator shown in FIG. 2. FIG. 4 is a front view of FIG. 3. It is the figure which removed and showed the coil | winding from FIG. FIG. 3 is a cross-sectional view showing three units of the actuator shown in FIG. 2. FIG. 7 is a perspective view of the three-unit actuator shown in FIG. 6. It is a schematic sectional drawing explaining the operating method of this invention. It is a schematic sectional drawing explaining the operating method of this invention. It is a figure which shows the interruption | blocking characteristic in the conventional puffer type gas circuit breaker. It is a figure which shows the interruption | blocking characteristic by the operating method which concerns on Example 1. FIG. It is a figure which shows the interruption | blocking characteristic by the operating method which concerns on Example 2. FIG. It is a figure which shows the interruption | blocking characteristic by the operating method which concerns on Example 3. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. The following are merely examples of implementation, and are not intended to limit the content of the invention to the following specific embodiments. The invention itself can be carried out in various modes as long as it conforms to the contents described in the claims.

  Example 1 will be described with reference to FIGS. FIG. 1 is a configuration example of a circuit breaker showing a closed state (a) and an open state (b). As shown in these figures, the circuit breaker according to the present embodiment is composed of a breaker for breaking the accident current and an operation part for operating the breaker.

The shut-off part is composed of a stationary contact and a movable contact that are electrically connected in a sealed metal container 1 filled with SF ₆ gas, and a movable contact connected to the operation part. The current is cut off and turned on by opening and closing.

  The fixed contact is composed of a fixed electrode 3 and a fixed arc contact 101 (see FIG. 8) fixed to an insulating support spacer 2 provided at the end of the sealed metal container 1.

  The movable contact is composed of the movable electrode 4 and the movable electrode 6 connected to the high voltage conductor 8, and the movable arc contact 102 shown in FIG.

  The hollow rod 106 connected to the movable arc contact 102 is connected to the operation unit via an insulating rod 81 in the insulating support cylinder 7 shown in FIG. A nozzle 5 is provided between the two electrodes at the tip of the movable electrode 6. Around the high voltage conductor 8, a current transformer 51 is provided that functions as a current detector for detecting a current flowing through the high voltage conductor 8.

  Usually, a current is passed between the fixed electrode 3 and the movable electrode 6. When the movable contact is operated during the interruption operation, the fixed electrode 3 and the movable electrode 6 are separated from each other, and the current path is changed to the path of the fixed electrode 3, the fixed arc contact 101, and the movable arc contact 102. When the fixed arc contact 101 and the movable arc contact 102 are separated, an arc is generated between the contacts. The current is cut off by extinguishing the arc.

  The operating unit is provided with an actuator 100 in an operating device case 61 provided adjacent to the sealed metal container 1, and a movable element 23 that moves linearly is disposed inside the actuator 100. The mover 23 is connected to the insulating rod 81 through a linear seal portion 62 provided so that the hermetic metal container 1 can be driven while being kept airtight. The insulating rod 81 is connected to the movable electrode 6. That is, it becomes possible to operate the movable electrode 6 in the blocking part through the operation of the movable element 23.

  The actuator 100 is electrically connected to the power supply unit 71 through a sealing terminal 10 provided in a state where an insulating gas is sealed on the surface of the sealed metal container 1. The power supply unit 71 is further connected to the control unit 72 and receives a command from the control unit 72.

  The current value detected by the current transformer 51 is input to the control unit 72. The power supply unit 71 and the control unit 72 function as a control mechanism that changes the amount and phase of a current supplied to a winding 41 of the actuator 100 described later according to the current value detected by the current transformer 51.

  The structure of the blocking part will be described with reference to FIGS. The stator 14 includes a first magnetic pole 11, a second magnetic pole 12 disposed to face the first magnetic pole 11, a magnetic body 13 that connects the first magnetic pole 11 and the second magnetic pole 12, and a first The windings 41 provided on the outer circumferences of the magnetic pole 11 and the second magnetic pole 12 are combined.

  From a magnet fixing member 22 (see FIG. 2) that supports the permanent magnet 21 and the permanent magnet 21 sandwiched between and supported by the first magnetic pole 11 and the second magnetic pole 12 with a gap in the stator 14. The actuator 100 is configured by arranging the movable element 23 configured.

  The magnetization direction of the permanent magnet 21 is the Y direction (vertical direction in FIG. 2), and is magnetized alternately for each adjacent magnet. The magnet fixing member 22 is preferably made of a nonmagnetic material such as a nonmagnetic stainless alloy, aluminum alloy, or resin material, but is not limited thereto.

  The actuator 100 is attached with mechanical parts in order to maintain a distance between the permanent magnet 21 and the first magnetic pole 11 and the second magnetic pole 12. For example, linear guides, roller bearings, cam followers, thrust bearings, and the like are preferable, but the present invention is not limited to this as long as the distance between the permanent magnet 21 and the first magnetic pole 11 and the second magnetic pole 12 can be maintained.

  Generally, attraction force (force in the Y direction) is generated between the permanent magnet 21 and the first magnetic pole 11 and the second magnetic pole 12. However, in this configuration, the attractive force generated in the permanent magnet 21 and the first magnetic pole 11 and the attractive force generated in the permanent magnet 21 and the second magnetic pole 12 are opposite to each other, so that the forces are offset and attracted. The power is reduced. Therefore, the mechanism for holding the mover 23 can be simplified, and the mass of the movable body including the mover 23 can be reduced.

  Since the mass of the movable body can be reduced, high acceleration driving and high response driving can be realized. Since the stator 14 and the permanent magnet 21 are relatively driven in the Z direction (left and right direction in FIG. 2), the stator 23 is fixed so that the mover 23 including the permanent magnet 21 moves in the Z direction.

  In driving, a magnetic field is generated by passing a current through the winding 41, and a thrust corresponding to the relative position of the stator 14 and the permanent magnet 21 can be generated. Also, by controlling the positional relationship between the stator 14 and the permanent magnet 21 and the phase and magnitude of the injected current, the magnitude and direction of the thrust can be adjusted.

  The operation control of the mover 23 is performed by supplying a current in the actuator 100 from the power supply unit 71 according to the case where an opening command and a closing command are input to the control unit 72, and sending an electric signal to the mover 23 in the actuator 100. This is done by converting to the driving force.

  FIG. 3 shows a perspective view of the structure of one unit of the actuator 100 described above. As shown in FIGS. 3 to 5, the first magnetic pole 11, the second magnetic pole 12, the magnetic body 13 connecting the first magnetic pole 11 and the second magnetic pole 12, and the winding 41 are included. The mover having the permanent magnet 21 moves relative to the stator 14 in the Z direction. By mechanically connecting the plurality of permanent magnets 21 with a magnet fixing member or the like, thrust in the Z direction can be continuously obtained, and the driving distance can be increased.

  In this embodiment, the magnetic body 13 that connects the first magnetic pole 11 and the second magnetic pole 12 is divided in the Y direction. Thereby, the attachment workability | operativity of the coil | winding 41 improves.

  Furthermore, the first magnetic pole 11 and the second magnetic pole 12 can be adjusted by shifting in the Z direction. When the first magnetic pole 11 and the second magnetic pole 12 are shifted from each other, the thrust can be increased by changing the magnetization direction of the permanent magnet.

  As in this embodiment, by configuring the mover 23 to be sandwiched between the first magnetic pole 11 and the second magnetic pole 12, the attractive force between the permanent magnet 21 and the magnetic pole is small, and the driving direction can be achieved even if linear driving is performed. The blur in the (Z direction) and the vertical direction (X direction and Y direction) is extremely small. That is, when applied to a circuit breaker, even if the mover that transmits the operating force passes through the linear seal portion 62, the deformation of the linear seal portion 62 is small, so that the mechanical burden on the seal portion is reduced.

This leads to not only the sliding operation failure of the linear seal portion 62 (see FIG. 1) accompanying the driving but also the prevention of the inclination of the contact of the movable side electrode 6, so It becomes a structure in which the minute metal foreign matter from is hardly generated. The galling may lead to malfunctions of shut-off and throwing in, and the metal foreign matter may lead to an insulation accident due to a decrease in insulation performance. In addition, the amount of SF ₆ gas inside the gas circuit breaker due to the seal deformation can be reduced. Thus, it becomes possible to improve the reliability as a circuit breaker from various viewpoints.

  FIG. 4 is a front view of FIG. FIG. 5 is a diagram in which the windings are omitted from FIG. 4 so that the relationship between the first magnetic pole 11, the second magnetic pole 12, and the magnetic body 13 connecting them can be easily understood. As can be seen from both figures, the winding 41 is wound around each of the first magnetic pole 11 and the second magnetic pole 12 so as to sandwich the permanent magnet 21 therebetween.

  Since the winding 41 and the permanent magnet 21 are arranged facing each other, the magnetic flux generated in the winding 41 acts on the permanent magnet 21 efficiently. Therefore, the actuator can be reduced in size and weight. Further, the magnetic circuit is closed by the first magnetic pole 11, the second magnetic pole 12, and the magnetic body 13 connecting the first magnetic pole and the second magnetic pole, and the path of the magnetic circuit can be shortened. As a result, a large thrust can be generated. Moreover, since the periphery of the permanent magnet 21 is covered with a magnetic material, the leakage magnetic flux to the outside can be reduced, and the influence on surrounding devices can be reduced.

  FIG. 6 shows a configuration in which three units of actuators 100a, 100b, and 100c are arranged side by side in the Z direction (the operation direction of the movable electrode 6).

  In this embodiment, specifically, the actuator 100b has an electrical phase of 120 ° (or 60 °) and the actuator 100c has an electrical phase of 240 ° (or 120 °) with respect to the actuator 100a. In this actuator arrangement, when a three-phase alternating current is passed through the winding 41 of each actuator, an operation similar to that of a three-phase linear motor can be realized.

  By using three units of actuators, it becomes possible to adjust the thrust by individually controlling the current as three independent actuators. The windings in each actuator can be injected with currents of different magnitudes or phases from the control mechanism.

  As one method, it is conceivable to separately supply U, V, and W three-phase currents supplied from one AC power source. In this case, there is no need to provide a plurality of power supplies, which is convenient. Also, in this case, there are options such as 3 × N sealing terminals as described above, and sharing of the sealing terminals for the actuators through which the same current flows.

  In this configuration, a constant thrust can be generated regardless of the positional relationship between the permanent magnet 21 and the configuration 200 using a plurality of actuators. Furthermore, it is possible to generate a braking force (damping force) by control, regenerate the electric power generated by the brake, and use electric energy efficiently.

The operation at the time of breaking of the circuit breaker configured as described above will be described. When an abnormality occurs in the power system and an accident current flows, the accident current is detected and the circuit breaker is opened. As a result, it is necessary to shift from the closed state shown in FIG. 1A to the open state shown in FIG. At that time, the arc plasma is extinguished and the accident current is interrupted by blowing SF ₆ gas having arc extinguishing performance against the arc generated between the electrodes in the interrupting portion.

The operation method of the present invention will be described based on FIG. In the two-chamber heat puffer type gas circuit breaker, the gas pressure formation when the SF ₆ gas is blown is performed by the heat puffer chamber 103 and the mechanical puffer chamber 104. During the shut-off operation, first, the pressure of the mechanical puffer chamber 104 increases due to mechanical compression, and the pressure of the heat puffer chamber 103 connected via the check valve 107 also increases. The check valve 107 allows airflow from the mechanical puffer chamber 104 to the heat puffer chamber 103, but has a function of regulating the reverse airflow.

  When the fixed arc contact 101 and the movable arc contact 102 are separated, an arc is generated between the fixed arc contact 101 and the movable arc contact 102. As the generated arc heat flows, the pressure in the heat puffer chamber 103 increases.

  When the pressure in the thermal puffer chamber 103 becomes higher than the pressure in the mechanical puffer chamber 104, the check valve 107 is closed. Therefore, the pressure in the mechanical puffer chamber 104 does not rise more than necessary, and the puffer reaction force is suppressed. Further, since the pressure relief valve 108 is also provided in the mechanical puffer chamber 104, an increase in pressure due to mechanical compression can be suppressed.

  The blown gas pressure is mainly formed in the heat puffer chamber 103 when a large current is interrupted, and the gas is blown against the arc with the gas pressure obtained by using the pressure in the mechanical puffer chamber 104 when the current is small and medium. Perform an arc.

  Although the stroke characteristics cannot be changed during the operation of the conventional operation device, the operation device according to the present embodiment can perform arbitrary stroke control, so that the operation can be decelerated and stopped during the operation. In addition, since this circuit breaker has a two-chamber heat puffer structure, it is possible to take in arc energy into the fixed heat puffer chamber and form the pressure of the blowing gas even if the stroke is stopped halfway. .

  In this embodiment, a plurality of independent actuators 100 are provided as described above, and the acceleration / deceleration pattern of the opening / closing operation can be variously controlled including during the driving. In such a case, it is possible to capture the current waveform and control the operation accordingly.

  As shown in FIG. 8, the current waveform can be detected by a current detecting current transformer 51. By inputting the detected current waveform to the control unit 72, an optimum operation is realized according to the cutoff current. Is possible. An example of controlling the operation depending on the breaking current will be described below.

  Hereinafter, a method of interrupting the current flowing through the high voltage conductor 8 will be described. In FIG. 1, the current flowing through the high voltage conductor 8 is measured by a current transformer 51 arranged around the high voltage conductor 8. The measured current value is sent to the control unit 72 of the controller. Inside the control unit 72, a command corresponding to the phase of the current is sent to the power supply unit 71.

  Hereinafter, a method for exhausting the hot gas remaining in the heat puffer chamber 103 will be described using the stroke characteristics shown in FIG. As a premise thereof, based on FIG. 10 (a diagram showing the correlation between the movable stroke in the shut-off operation and the closing operation, the current waveform in the shut-off portion, and the pressure in the puffer chamber when the conventional technique is applied) The operation and problems at the time of stroke characteristics will be described.

  With springs and hydraulic actuators, the closing position and shutoff position are fixed, and the stroke position cannot be adjusted during the shutoff operation. In the two-chamber heat puffer type circuit breaker, the high-temperature gas generated in the heat puffer chamber 103 at the first shut-off is only discharged through the flow path formed by the nozzle 5 and the movable arc contactor 102.

  During the charging operation, the mechanical puffer chamber 104 has a negative pressure, but the low-temperature gas in the sealed metal container 1 is drawn through the charging check valve 109. Since the heat puffer chamber 103 is fixed in volume, gas replacement is not performed.

The hot gas is replaced only by the pressure difference inside and outside the heat puffer chamber 103 from the time of current interruption (time t _{1 in} FIG. 10) until the _second interruption start time (time t _{2 in} FIG. 10). For this reason, it takes time to lower the gas temperature remaining in the heat puffer chamber 103 and to recover the gas density. In particular, there is a concern that the current interruption capability at the time of high-speed reclosing interruption is very short, about 0.3 to 0.5 seconds, from the first interruption of current to when it is turned on and when the interruption of current starts again.

  Based on FIG. 8 and FIG. 11, the stroke characteristics for exhausting the high temperature gas remaining in the heat puffer chamber 103 after the first current interruption according to the present invention and the operation of the interruption unit at that time will be described.

  In order to replace the hot gas in the heat puffer chamber 103, in addition to the gas replacement due to the pressure difference described above, a low temperature gas is caused to flow from the mechanical puffer chamber 104. The machine puffer chamber 104 is provided with a check valve 109 for closing so that a negative pressure does not occur during the charging operation. Thus, during the charging operation, the low-temperature gas in the sealed metal container 1 is operated while being drawn into the mechanical puffer chamber 104, and the low-temperature gas is filled in the mechanical puffer chamber 104.

  In the conventional operating device, the position of the movable side after the shut-off / closing operation is constant, but when the operating device as described in this embodiment is used, the stroke position can be controlled. It is also possible to operate from the stroke position a in the shut-off or closing direction.

FIG. 8B shows a state when the movable side has moved to the full stroke position after completion of the shut-off. Until the pressure in the heat puffer chamber 103 returns to the same level as the pressure in the sealed metal container 1 (between times t _{3 and} t _{4 in} FIG. 11), the pressure in the heat puffer chamber 103 is the pressure in the sealed metal container 1. Therefore, the high temperature gas in the heat puffer chamber is discharged due to the pressure difference.

After the pressure difference disappears, the closing operation is temporarily performed at time t ₄ -t ₅ in FIG. 11, so that the movable portion is again turned on from the temporarily turned on state shown in FIG. Then, it operates in the blocking direction and shifts to the state shown in FIG. At this time, the low temperature gas taken into the mechanical puffer chamber 104 by the temporary charging operation is compressed and taken into the hot puffer chamber 103 through the check valve 107.

  A part of the high temperature residual gas in the heat puffer chamber 103 is discharged from the heat puffer chamber 103, and the residual high temperature gas in the heat puffer chamber 103 is mixed with the gas taken in from the mechanical puffer chamber 104, thereby The temperature in the chamber 104 can be lowered. Thereby, it becomes possible to prevent the interruption | blocking performance at the time of high-speed reclosing interruption | blocking from falling.

In this embodiment, SF ₆ is used as the insulating gas, but the type of insulating gas is not limited to SF _6, and other insulating gases such as dry air and nitrogen gas can be used.

  Hereinafter, an embodiment applied to a double drive type circuit breaker will be described with reference to FIG. The tip of the insulating nozzle 5 is fixed to one end of the connecting rod 201, and the other end of the connecting rod 201 and one end of the connecting lever 203 are rotatably connected. The substantially center of the connecting lever 203 is fixed to the inner peripheral surface of the fixed electrode 3 so as to be rotatable by the support shaft 202, and the other end of the connecting lever 203 and the terminal end of the fixed arc contactor 101 are rotatably connected.

  With such a configuration, when the movable side starts a blocking operation, the fixed arc contact 101 operates in a direction opposite to the movable side. Even in such a double drive type circuit breaker, the same effect can be obtained by the operation method using the actuator 100 specified in the above embodiment.

  In this embodiment, the heat puffer chamber is obtained using the stroke characteristics shown in FIG. 12 (a diagram showing the correlation between the movable stroke in the shut-off operation and the closing operation, the current waveform in the shut-off portion, and the pressure in the puffer chamber). The hot gas remaining in 103 can be cooled.

In this embodiment, the normal interruption operation is performed until the current interruption completion time (t _{6 in} FIG. 12). Since the pressure in the heat puffer chamber 103 is higher than the pressure in the sealed metal container 1 after the shut-off is completed, the heat puffer chamber 103 is stopped at the position of the stroke b until the pressure difference disappears, and the high temperature in the heat puffer chamber 103 is obtained by gas replacement by the pressure difference Exhaust the gas. When the pressure difference disappears, the discharge speed becomes slow, so that the shutoff operation is performed again after the pressure difference disappears (time t _{7 in} FIG. 12).

Since the low-temperature gas in the mechanical puffer chamber 104 is compressed and sent into the heat puffer chamber 103 by the cutoff operation between times t _{7 and} t _{8 in} FIG. 12, it is possible to prevent a reduction in the cutoff performance when the high-speed reclosing is shut off. Become.

  A method of blowing a high-pressure gas against the arc at the current zero point will be described with reference to FIGS. 8A and 8B and FIG. The gas pressure in the thermal puffer chamber 103 depends on the current and the flow path area in the nozzle 5. Energy is supplied from the arc generation space which is a pressure generation source, and the pressure in the heat puffer chamber 103 rises.

When the current approaches the zero point, the amount of energy supply decreases, the pressure in the arc generation space and the heat puffer chamber 103 is reversed, and gas blowing to the arc is started. The gas blown at that time passes through the nozzle throat portion (channel cross-sectional area: S _B ), passes through between the stator arc contactor 101 and the nozzle 5 (channel cross-sectional area: S _A ), and goes downstream of the nozzle 5. Discharged.

If the fixed arc contactor 101 passes through the nozzle throat portion before reaching the current zero point (that is, when the flow path area relationship shown in FIG. 8 is S _A > S _B ), the pressure drop occurs before the current zero point. The pressure characteristic S ₂ in FIG. 13 is increased, and the gas blowing ability to the arc at the current zero point is reduced.

  Further, if the flow path area is extremely narrowed to prevent a pressure drop, the gas blowing pressure to the arc at the current zero point is lowered, making it difficult for the gas to escape downstream of the nozzle.

  Therefore, in this embodiment, the stroke characteristic as shown in FIG. 13 is adopted to prevent a decrease in insulation performance between the electrodes due to pressure drop and gas retention between electrodes after the current zero point.

The operation method of the circuit breaker for implement | achieving the above is demonstrated using FIG. Simultaneously with the opening command, the breaking operation is started, and the breaking portion is decelerated or stopped at t ₉ -t ₁₀ immediately before the current zero point time in FIG.

At this time, by setting the stroke position c so that the flow path area relationship of the blocking portion becomes S _A ≈S _B , the pressure characteristic as in S ₁ can be realized, so that the pressure drop in the thermal puffer chamber 103 at the current zero point is reduced. Can be prevented.

At the stroke position c where the flow path area relationship of the cutoff part is S _A ≈S _B , the gas discharge area is not narrow and sufficient, so after the current cutoff (time t ₁₀ ), the full stroke position a is shut off immediately. The hot gas between the electrodes is efficiently exhausted to prevent the insulation performance between the electrodes from deteriorating.

  In the above-described embodiment, the operation method for preventing the pressure drop in the thermal puffer chamber 103 at the time of the current zero point has been described. By further adopting the operation method described in 1 and 2, by reducing the gas temperature in the heat puffer chamber 103, it is possible to provide a puffer type gas circuit breaker with better shutoff performance.

DESCRIPTION OF SYMBOLS 1 Sealed metal container 3 Fixed side electrode 4 Movable side electrode 5 Nozzle 6 Movable electrode 7 Insulating support cylinder 8 High voltage conductor 11 First magnetic pole 12 Second magnetic pole 13 Magnetic body 14 Stator 21 Permanent magnet 22 Magnet fixing member 23 Movable Child 24 Mover connecting component 30 Fixed plate 31 Spacer 41 Winding 51 Current transformer 61 Actuator case 62 Linear seal portion 71 Power supply unit 72 Control unit 73 Power storage unit 81 Insulating rod 100 Actuator 101 Fixed arc contact 102 Moving arc contact 103 Heat Puffer Chamber 104 Mechanical Puffer Chamber 105 Fixed Piston 106 Hollow Rod 107 Check Valve 108 Relief Valve 109 Input Check Valve

Claims (4)

  A sealed metal container filled with an insulating gas, a fixed contact disposed in the sealed metal container, a movable contact contacting and separating from the fixed contact, and at the time of opening A volume-fixed heat puffer chamber having an insulating gas that is released against an arc generated between the fixed contact and the movable contact, and electrically connected to the fixed contact and the movable contact A main circuit conductor, a mover having a permanent magnet or a magnetic body arranged in the operating direction of the movable contact while alternately inverting the N and S poles, and facing the N and S poles of the mover And a stator for generating an operating force by a magnetic force generated by the winding and applying an operating force to the movable contact, and a current flowing through the main circuit conductor. A current detector to be detected and a current detected by the current detector; A method for operating a puffer type gas circuit breaker having a control mechanism for changing the amount of current supplied to the winding according to a value, wherein the movable contactor is operated once before re-inserting from the position where the interruption is completed. A method for operating a puffer-type gas circuit breaker. In claim 1,
In the operation method of the puffer type gas circuit breaker, the movable contactor is operated once in the closing direction and then again in the blocking direction. In claim 1,
The operation is a method of operating a puffer type gas circuit breaker characterized in that the movable contactor is once further moved in the breaking direction. In any one of Claims 1 thru | or 3 ,
The fixed contact is composed of a fixed electrode and a fixed arc contact fixed to an insulating support spacer provided at an end of the sealed metal container,
The movable contact is composed of a movable electrode connected to the main circuit conductor, a movable electrode energized with the fixed electrode, and a movable arc contact energized with the fixed arc contact,
A nozzle is provided at the tip of the movable electrode,
Furthermore, the gas flow passage cross-sectional area formed between the nozzle after the fixed arcing contact at the time of shut-off operation has passed through the nozzle throat section provided inside the nozzle the fixed arcing contact with the nozzle throat A method of operating a puffer-type gas circuit breaker, characterized in that the movable contactor is temporarily stopped at a position where the cross-sectional areas are the same.

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