JPH06124627A - High speed re-closing path earthed switch - Google Patents

Abstract

PURPOSE:To provide a high speed re-closing earthed switch capable of cutting off an induction current that cannot form a current zero point during several cycles. CONSTITUTION:A controller 23 for controlling a speed of a switch opening operation is disposed in an operating device 9 of a puffer type arc extinguishing chamber 7. The controller is such constituted that a speed of the switch opening operation is temporarily reduced from the vicinity of a first switch opening position where a pressure increasing value, at which an electromagnetic induction current can be cut off, can be obtained at the time of switch opening while a speed of the switch opening operation is increased after a second switch opening position in the final period of switch opening. For example, a buffer for decelerating the switch opening operation is used as the controller, and it can be operated at the time of deceleration while it can be stopped at the time of acceleration. The second switch opening position in the final period of switch opening can be particularly set near the switch opening position corresponding to the terminal point of a zero-miss current in the case where the zero-miss current is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention eliminates a ground fault caused by a reverse flashover (reverse flashover) between insulator-lined arc horns of a transmission line in a high-voltage power transmission line for electric power by a line breaker. After that, the electromagnetic induction current arc that persists in the arc horn is extinguished by the high-speed closing operation that cooperates with the opening / closing operation of the circuit breaker, and the induced current is cut off by the immediate opening operation, and the circuit breaker is reclosed. It relates to a high-speed reclosing earthing switch (HSES) that enables re-transmission.

[0002]

2. Description of the Related Art When lightning strikes a power transmission line, a reverse flashover occurs in an arc horn of a series of insulators suspended on the power transmission line. Most of the accidents that occur on power lines are single-line ground faults caused by this reverse flashover. In order to eliminate the failure due to the ground fault, it is sufficient to set the failure section to no voltage and extinguish the reverse flashover that is the cause of the accident. Specifically, it is effective to cause the circuit breakers at both ends of the failed transmission line to perform the reclosing operation. The reclosing operation is to open the contact once, make the faulty section have no voltage, extinguish the reverse flashover, and then turn it on again. By performing such a reclosing operation, it is possible to perform re-power transmission without a power failure.
A typical method of reclosing is a single-phase reclosing method.
This single-phase reclosing method is widely used because it has little fluctuation in power and excellent transient stability.

However, in recent years, UHV power transmission lines of 1100 kV or the like have been used as high voltage power transmission lines as the demand for electric power has increased. When a single-phase reclosing circuit is performed in this UHV system transmission line, electrostatic electromagnetic induction received from another phase of the same line or another line connected together becomes larger than in the case of the conventional 500 kV system. When the electrostatic induction from the other phase is large, when reverse flashover of the insulator arc horn occurs, even if the circuit breakers at both ends of the fault section are opened, the reverse flashover is extinguished. Becomes difficult to do. Therefore, in a high-voltage transmission line such as a UHV system, a high-speed reclosing grounding switch is installed in the one-line ground fault phase of the high-voltage transmission line in order to extinguish the reverse flashover. That is, after disconnecting the accident occurrence point from the power transmission line by the circuit breakers at both ends, by turning on this high-speed reclosing grounding switch at high speed in cooperation with the switching operation of the circuit breaker, the electromagnetic continuation to the insulator horn The induced current arc is extinguished, and the opening operation is immediately performed to interrupt the induced current, thereby enabling re-power transmission by reclosing the circuit breaker.

A protection system employing this high-speed reclosing grounding switch will be specifically described below with reference to the drawings.
FIG. 5 is an explanatory diagram showing the configuration of this system. In the figure, 1 is a bushing and 3 is a UHV type steel tower. Two
Is a transmission line for high voltage, has three lines of an upper phase, a middle phase, and a lower phase, and is stretched between the bushing 1 and the steel tower 3 or between the steel towers 3. Each steel tower 3 is provided with an insulator string 3b equipped with an arc horn 3a, and the power transmission line 2 is suspended from the steel tower 3 by the insulator string 3b. A circuit breaker (GCB) and a high-speed reclosing grounding switch (HSES) are provided at both ends of a certain section of the power transmission line 2. 4 is a thundercloud,
5 is lightning. In this system, 3 power lines 2
When a thunder cloud 4 falls on one of the two, a reverse flashover 3c occurs in the arc horn 3a of the insulator string 3b suspending the power transmission line 2, and the reverse flashover 3c is generated from the power transmission line 2. A ground fault current flows through the steel tower 3 through the ground fault, causing a ground fault.

The operation sequence of the circuit breaker (GCB) and the high-speed reclosing earthing switch (HSES) when a one-line ground fault occurs due to the reverse flashover 3c will be described with reference to the operation sequence diagram of FIG. . That is, before the occurrence of the ground fault accident, the circuit breaker (GCB) is in the closed state, and the high-speed reclosing grounding switch (HSES) is in the open state. When a ground fault occurs on the power transmission line 2, the circuit breaker (GCB) first performs the opening operation after a lapse of T ₁ hours, which is the time for the transmission line protection relay. However, an induced current flows in the accident power transmission line 2 due to electrostatic electromagnetic induction from another phase, and as a result, the reverse flashover 3c is still maintained between the arc horns 3a. Therefore, with the circuit breaker (GCB) open, the high-speed reclosing grounding switch (HSES) is forcibly closed at high speed, and the induced current grounded in the arc horn 3a is grounded at high speed again. By guiding it to the switch (HSES) side, the reverse flashover of the arc horn 3a is extinguished. The high-speed re-closed earthing switch (HSES) keeps turning on for θ time to extinguish the reverse flashover, then returns to the opening state to cut off the induced current, and finally the circuit breaker performs closing operation to transmit power. Resume.

By the way, as described above, in order to extinguish the reverse flashover, when the closing operation of the high-speed re-closed earthing switch (HSES) is performed with the circuit breaker (GCB) being opened, The electromagnetic induction current flowing through the high-speed reclosing ground switch (HSES) reaches 2000 A as shown in FIG. When such a large current interruption occurs,
As shown in, a transient recovery voltage in which the transient phenomenon component of the electric circuit and the electrostatic induction voltage received by the faulty transmission line from another line are superimposed is applied. Such a relatively large current, a relatively large rate of rise, and interruption of the transient recovery voltage condition of a high peak value make it possible to simply open and close a rod-shaped contactor in SF ₆ gas. In this case, a high-speed reclosed earthing switch (HSES) having a puffer-shaped arc-extinguishing chamber is required as in the case of the circuit breaker.

With reference to FIG. 1, an example of a conventional high-speed reclosed earthing switch (HSES) having a puffer type arc extinguishing chamber will be described. In this figure, a puffer arc extinguishing chamber 7, a conductor 8 and the like are housed in a grounding container 6. And
The movable portion of the puffer arc-extinguishing chamber 7 is adapted to be opened and closed by the operating device 9, and the operating stroke of the operating device 9 is between the movable portion of the puffer-arc extinguishing chamber 7 and the operating device 9. There is provided a link portion 10 for converting the above to obtain the required opening length. Further, the conductor 8 is supported at both ends thereof by the insulating spacers 11a and 11b with respect to the ground container 6, and is electrically insulated. Further, in the vicinity of the movable part of the puffer arc-extinguishing chamber 7, a ground terminal portion 12 is provided so as to penetrate the grounding container 6, and is electrically connected to the movable part of the puffer-arc extinguishing chamber 7. When the ground switch is closed, the conductor 8 is connected to the ground terminal portion 12 via the puffer arc extinguishing chamber 7.

FIG. 2 shows a detailed structure of the puffer type arc extinguishing chamber of FIG. In this case, FIG. 2 shows the state at the end of opening. In the figure, A is a fixed contact portion, which is composed of a fixed contact 13 and a shield 14a. Further, B is a movable contactor portion, and a puffer cylinder 16 is attached to a cylindrical operation rod 15 connected to the operation device 9, and the movable contactor 17 is mounted on the puffer cylinder 16.
And an insulating nozzle 18 is attached. A puffer piston 19 is inserted in the puffer cylinder 16, and a shield 14 facing the shield 14 a of the fixed contactor portion A is provided on the outer periphery of the puffer cylinder 16.
b is provided, and the puffer piston 19 and the shield 14 b are fixed to the ground container 1.
The members 16 to 18 are configured to move integrally with the puffer piston 19 and the shield 14b fixed in this way.

The operation of the puffer type arc-extinguishing chamber of FIG. 2 having such a structure is as follows. That is, during the opening operation, the gas in the puffer cylinder 16 is compressed, and a gas flow in two directions as indicated by a dotted arrow in the drawing is generated in the insulating nozzle 18 at the tip, so that the fixed contact 13 and the movable contact 17 are separated. The arc generated between them is extinguished. Further, after the completion of the contact opening, the insulation between the fixed contact portion and the movable contact portion is secured by the effect of the shields 14a and 14b. In this case, the gap L ₀ between the inner surface of the tip end of the puffer cylinder 16 and the end face of the puffer piston 19 at the end of the contact opening as shown in FIG. 2 is such that the puffer cylinder 16 and the puffer piston 19 collide during the contact opening operation. The length is set to be necessary and sufficient so that it will not occur.

FIG. 9 shows a stroke (opening contact movement characteristic) at the opening operation and a pressure rise characteristic in the puffer cylinder in the conventional high-speed reclosed earthing switch (HSES) as described above. In this figure, X ₀ indicates the opening start position, which is the minimum pressure increase value ΔP that can be interrupted at the initial opening stage.
_The opening position where _1a is obtained is X ₁ , and the opening distance at that time is L ₁
Further, X ₂ is an opening position where the opening distance is L ₂ that can be interrupted if the pressure rise is sufficient. The minimum pressure increase value that can be interrupted at the end of opening is ΔP _1b . As is clear from the fact that it is used in a gas circuit breaker, since the shutoff performance of the puffer type arc extinguishing chamber is excellent, the extinction of the electromagnetic induction current of 2000A to 3000A is
It is relatively easy, and as shown in FIG. 9, the arc can be extinguished with a low pressure rise value (ΔP _1a , ΔP _1b ). On the other hand, since a high transient recovery voltage is applied, the breaking cannot be successful unless the opening distance is set sufficiently large. Further, in FIG. 9, the opening distance L ₁ when the minimum pressure rise value ΔP _1a that can be interrupted in the initial opening is obtained is not sufficiently large to interrupt, and is set to the opening distance L ₂ . Only then can it be shut off. Therefore, in this case, the time from the contact opening start position X ₀ to the contact opening position X _{2 at} which the opening distance L ₂ can be cut off is
The shortest possible arc time Ta _{min is} reached, and the minimum pressure rise value ΔP _{1b that} can be interrupted from the opening start position X ₀ to the end of opening.
Is the maximum arc time Ta that can be interrupted
It will be _max . The time from the opening position X _{2 at} which the breaking distance L ₂ can be cut off to the time when the minimum pressure increase value ΔP _{1b at} which the breaking can be completed is obtained at the end of opening is the arcable width T _{w of} breaking. . This breakable arc time width T _w is generally sufficient if it is equal to or longer than the half-wave time of the breaking current.

[0011]

By the way, as shown in FIG. 5, the power transmission line 2 has an upper phase, a middle phase, and a lower phase, and a predetermined load current flows in each phase. Assuming that a ground fault occurs in the middle phase of the power transmission line 2 and the reclosing operation is performed in the operation sequence shown in FIG. 6, the current flowing in each phase of the power transmission line 2 is as shown in FIG. It becomes as shown in the current change diagram. That is, as shown in FIG. 10, in the middle phase of the power transmission line 2, at the time of occurrence of the ground fault accident T
The fault current flows only between ₀₁ and T ₀₂ when the circuit breaker (GCB) opens. However, the middle phase of the power transmission line 2 receives electrostatic electromagnetic induction from other healthy phases, that is, the upper phase and the lower phase, and other lines connected together. Therefore, when the circuit breaker is in the open state, the reverse flashover due to the induced current still occurs in the arc horn of the middle phase of the transmission line 2. Turn on the closed circuit grounding switch (HSES) (T ₀₃ when _{turning on} ). Then, as shown in FIG. 10, the high-speed re-closed earthing switch is initially superposed with the ground fault fault current and the electromagnetic induction current including the DC component after the time T ₀₃ when the switch is turned on, and the displacement is higher than the current zero point. The generated current flows, and as the ground fault current is subsequently grounded, the electromagnetic induction current component increases, and an alternating current passing through the current zero point flows. Therefore, when the induced current is cut off by the high-speed re-closing earthing switch (HSES), the current can be cut off relatively easily by catching the timing when the current becomes zero and performing the opening operation. it can.

However, after a ground fault occurs in the middle phase of the transmission line in this way, one of the two phases other than the middle phase (the upper phase in this example) or another line connected in parallel. In the first phase, a ground fault accident (follow-up failure) occurs at time T ₀₄ , and the timing of this follow-up failure accident overlaps with the opening timing of the middle-phase high-speed re-closing ground switch (HSES), and also the back-up failure accident. When the current has a large amount of direct current component, an induction current with a large amount of direct current component generated by electromagnetic induction due to the fault current of the upper phase flows through the middle-phase power transmission line, as shown in FIG.
As shown in part A of 0, a zero miss current that does not form a current zero flows in the medium-phase high-speed reclosed earthing switch (HSES) for several cycles. It is much more difficult to cut off this zero-miss current than to cut off the zero point of a normal alternating current. In this case, if the minimum pressure increase value that can be interrupted can be secured when the current again forms the zero point, the current can be interrupted at the time when the zero point is formed. However, as described above, the breakable arc time width T _w (FIG. 9) obtained by the conventional high-speed re-closed earthing switch (HSES) is shorter than the time width until the current again forms the zero point. It is difficult to make a cutoff after all.

The present invention has been proposed in order to solve the problems of the prior art as described above, and an object thereof is a high-speed reclosing circuit capable of interrupting an induced current that does not form a current zero point for several cycles. The purpose is to provide a ground switch.

[0014]

A high-speed reclosing earthing switch according to the present invention is installed in each phase of a high-voltage transmission line connecting a circuit breaker, and a reverse flash of an arc horn of an insulator series provided in the transmission line. In the case of a one-line ground fault due to an overcurrent, the circuit breakers at both ends of the transmission line are opened to close the disconnected transmission line at high speed, and the other phase or another line that continues to the insulator series is grounded. Extinguish the electromagnetic induction current arc from
A high-speed reclosed grounding switch equipped with a puffer-type arc-extinguishing chamber and an operating device for the reopening of the circuit breaker, thereby enabling re-power transmission by reclosing the circuit breaker. The operating device for the puffer-type arc-extinguishing chamber is provided with a control means for controlling the speed of the opening operation, and the control means is configured to obtain a pressure increase value capable of interrupting the electromagnetic induction current when opening. It is characterized in that the opening operation is temporarily decelerated from the vicinity of the opening position and the opening operation is accelerated from the second opening position at the end of opening. In this case, as the control means for controlling the speed of the opening operation, for example, a shock absorber that reduces the speed of the opening operation is used, the shock absorber is operated during deceleration, and the operation of the shock absorber is canceled during acceleration. It is possible to set as follows. In addition, the second end of the opening phase
Specifically, it is possible to set the contact opening position in the vicinity of the contact opening position corresponding to the end point of the zero-miss current when the zero-miss current occurs.

[0015]

The operation of the present invention constructed as described above is as follows. That is, when the puffer type arc extinguishing chamber is opened,
By decelerating the opening speed from the vicinity of the first opening position where a pressure increase value capable of interrupting the electromagnetic induction current is obtained by the control means, the pressure increase value during the opening operation decreases with a gentle slope, As a result, it is possible to lengthen the time until the end of opening, so that it is possible to lengthen the arc duration that can be interrupted. Further, in this case, the pressure increase value at the time of zero miss current becomes a value close to the minimum pressure increase value that can be interrupted. Then, by accelerating the opening operation from the vicinity of the second opening position at the end of opening, it is possible to obtain a sufficient pressure increase value that can be interrupted when the current again forms the zero point.

Therefore, a ground fault occurred in one phase of the transmission line, the circuit breaker was opened, and subsequently the high-speed re-closed earthing switch (HSES) was turned on to extinguish the reverse flashover. Later, in the adjacent other phase or in the other line that was put together, a back-up failure accident that overlaps with the opening timing of the high speed re-closed earthing switch (HSES) in the ground fault phase occurs. Even if a zero-miss current that does not form a current zero point flows through the high-speed re-closed earthing switch (HSES) in the ground fault phase, which contains a large amount of current component, while the zero-miss current is flowing, The pressure rise value is suppressed to a low level, and a sufficient pressure rise value that can be interrupted when the current again forms the zero point is obtained, so that the current interruption can be performed at the current zero point. Further, as described above, since the pressure increase value can be suppressed to a low value during the opening operation,
There is also an advantage that the volume of the puffer cylinder forming the puffer arc extinguishing chamber can be reduced, and as a result, the high-speed reclosing grounding switch can be downsized as a whole.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a high speed reclosed earthing switch (HSES) according to the present invention will be described below with reference to FIGS. 1 to 4.

One embodiment according to the present invention is basically shown in FIG.
2 has a configuration as shown in FIG. 2, and this configuration is as described above in the description of the prior art. That is, as shown in FIG. 1, the ground container 6 contains a puffer-shaped arc-extinguishing chamber 7, a conductor 8, and the like. The movable part of the puffer arc-extinguishing chamber 7 is driven to be opened and closed by the operating device 9. Between the movable part of the puffer-arc extinguishing chamber 7 and the operating device 9, the operating device 9 is inserted. Link part 1 for converting the operating stroke to obtain the required opening length
0 is provided. Further, the conductor 8 is supported at both ends thereof by the insulating spacers 11a and 11b with respect to the ground container 6, and is electrically insulated. Further, in the vicinity of the movable part of the puffer arc-extinguishing chamber 7, a ground terminal portion 12 is provided so as to penetrate the grounding container 6, and is electrically connected to the movable part of the puffer-arc extinguishing chamber 7. When the ground switch is closed, the conductor 8 is connected to the ground terminal portion 12 via the puffer arc extinguishing chamber 7.

Further, the detailed structure of the puffer type arc extinguishing chamber is as described above. That is, as shown in FIG. 2, A is a fixed contactor portion, and the fixed contactor 1
3 and the shield 14a. Also, B
Is a movable contactor, and a puffer cylinder 16 is attached to a cylindrical operation rod 15 connected to the operation device 9, and a movable contactor 17 and an insulating nozzle 18 are attached on the puffer cylinder 16. A puffer piston 19 is inserted in the puffer cylinder 16, and a shield 14 b facing the shield 14 a of the fixed contactor A is provided on the outer peripheral part of the puffer cylinder 16.
And the puffer piston 19 and the shield 14 b are fixed to the ground container 1. The members 16 to 18 are configured to move integrally with the puffer piston 19 and the shield 14b fixed in this way.

In addition to the basic configuration as described above, the operating device 9 of this embodiment is constructed as shown in FIG.
That is, the operating device 9 includes the drive source 21 and the drive source 2
The driving rod 22 for driving the movable portion B of the puffer arc extinguishing chamber 7 via the link portion 10 by the driving force of 1 is provided, and the operating speed of the driving rod 22 is between the driving source 21 and the driving rod 22. A shock absorber (control means) 2 for reducing the speed of the movable part B of the puffer arc extinguishing chamber 7 by decelerating
3 is provided.

In this case, as shown in FIG. 4, the shock absorber 23 opens the opening start position X ₀ , and the minimum pressure increase value ΔP _1a that can be interrupted at the initial opening as shown in FIG. Let X _{1 be} the pole position, L _{1 be} the opening distance at that time, and X ₂ be the opening position where the opening distance L ₂ that can be interrupted is the minimum pressure rise value that can be interrupted at the end of opening. When ΔP _1b is set, the operation is performed from the vicinity of the contact opening position (first contact opening position) X ₁ and the contact opening operation is decelerated. Also,
When the opening position corresponding to the end point of the zero-miss current is set to X ₃ , the buffer device 23 releases the operation from the second opening position near the opening position X ₃ and opens the contact. Set to accelerate movement. In addition, in FIG.
For comparison, the opening characteristics (stroke) in the conventional example
Is indicated by a dotted line.

Next, the operation of this embodiment will be described.
That is, in the present embodiment, by operating the shock absorber 23, the opening speed in the middle of the opening operation is reduced, so that the pressure increase value decreases with a gradual slope as shown in FIG. As a result, the time until the end of the contact opening can be made significantly longer than in the conventional case, so that the breakable arc time width can be lengthened. Further, in this case, the pressure increase value at the time of zero miss current becomes a value close to the minimum pressure increase value that can be interrupted. Then, when the current again forms a zero point at the end of the opening, the opening operation is accelerated by canceling the operation of the shock absorber 23, so that the pressure increase value rises again and a sufficient pressure increase value that can be interrupted. Is obtained. In FIG. 4, the time from the opening start position X ₀ to the opening position X _2, which is the opening distance L ₂ that can be interrupted, is the shortest arc time Ta _{min that} can be interrupted, and the opening start position X ₀ to the opening end period. The time until the minimum pressure rise value ΔP _1b that can be interrupted is obtained is the maximum arc time Ta _max that can be interrupted. And
From the opening position X ₂ which is a blockable opening distance L _2, the time until the minimum pressure increase value [Delta] P _1b can block is obtained opening end becomes the disconnectable arcing time width T _w. In this case, the breakable arc time width T _w of the present embodiment can be made 3 to 4 times longer than the breakable arc time width of the conventional example described above.

As described above, in the present embodiment, the breakable arc time width can be greatly extended compared to the conventional case. Therefore, as described above, when the current zero point is not formed for several cycles, that is, in the transmission line. A ground fault occurred in one phase, the circuit breaker opened, and then the high-speed re-closed earthing switch (HSES) was turned on for extinguishing the reverse flashover. On the other line that was hung, a back-up failure accident that overlaps with the opening timing of the high-speed re-closed earthing switch (HSES) in the ground fault phase occurs, and this back-up failure current contains a lot of DC current component. Even if a zero-miss current that does not form a current zero for several cycles flows through the high-speed re-closed earthing switch (HSES) in the fault phase, even if the current zero is formed again, sufficient pressure that can be cut off is provided. Temperature value is obtained, it is possible to perform current cutoff by the current zero point. Further, as described above, since the pressure rise value can be suppressed to a low value during the opening operation, the volume of the puffer cylinder constituting the puffer arc extinguishing chamber can be reduced, and as a result, the high-speed re-closed circuit grounding can be achieved. There is also an advantage that the entire switch can be downsized. Therefore, according to the present embodiment, it is possible to easily realize an excellent high-speed reclosing grounding switch for a high-voltage power transmission line, which can cut off any induced current having a size within the breaking range.

The present invention is not limited to the above-mentioned embodiment, and the specific details of the puffer arc extinguishing chamber and its operating device can be selected as appropriate. That is,
The specific configuration of the control means or the like can be appropriately selected. For example, as the control means, an opening position detecting device and a zero-miss current detecting device are used in addition to the shock absorber, and the operation of the shock absorber is started by sending a command from these detecting devices to the shock absorber. Things are possible.

[0025]

As described above, according to the present invention,
To provide a high-speed reclosed earthing switch capable of interrupting an induced current that does not form a current zero point for several cycles by providing a control means for controlling a speed of an opening operation in a puffer type arc extinguishing chamber operating device. You can

[Brief description of drawings]

FIG. 1 is a high-speed reclosing earthing switch (HSE) according to the present invention.
FIG. 6 is a configuration diagram showing an example of S) and a conventional example.

FIG. 2 is a diagram showing a detailed structure of the puffer-type arc-extinguishing chamber of FIG. 1 and is a configuration diagram showing a state at the end of contact opening.

3 is a block diagram showing the configuration of the operating device of FIG.

FIG. 4 is a characteristic diagram showing a stroke (opening movement characteristic) at the time of opening operation and a pressure increase characteristic in the puffer cylinder in the high-speed reclosing earthing switch (HSES) of FIG. 1;

FIG. 5 is an explanatory diagram showing a configuration of a protection system using a high-speed reclosing grounding switch.

FIG. 6 is an operation sequence diagram showing an operation sequence of a circuit breaker (GCB) and a high-speed reclosing earthing switch (HSES) when a one-line ground fault accident occurs due to reverse flashover.

FIG. 7 is a waveform diagram showing characteristics of an electrostatic induction current and an electromagnetic induction current from the other phase to the operating phase of the high-speed reclosed earthing switch (HSES).

FIG. 8 is a transient recovery voltage waveform diagram at the time of opening of a high-speed re-closing earthing switch (HSES).

FIG. 9 is a characteristic diagram showing a stroke (opening movement characteristic) at the time of opening operation and a pressure increase characteristic in the puffer cylinder in a conventional high-speed reclosed earthing switch (HSES).

FIG. 10 shows changes in the current flowing through each phase of the high-speed reclosing ground switch (HSES) and the transmission line when a ground fault occurs in one phase of the transmission line and a follow-up failure accident occurs in the other phase. The current waveform figure shown.

[Explanation of symbols]

 GCB ... Circuit breaker HSES ... High-speed reclosing earthing switch A ... Fixed contactor B ... Movable contactor 1 ... Bushing 2 ... Power transmission line 3 ... Tower 6 ... Grounding container 7 ... Puffer arc-extinguishing chamber 8 ... Conductor 9 ... Operating device 10 ... Link parts 11a, 11b ... Insulating spacer 12 ... Grounding terminal part 13 ... Fixed contact 14a, 14b ... Shield 15 ... Operation rod 16 ... Puffer cylinder 17 ... Movable contact 18 ... Insulation nozzle 19 ... Puffer piston 21 ... Drive source 22 ... Drive rod 23 ... Shock absorber (control means)

Claims (1)

[Claims] 1. A single-line ground fault caused by a reverse flashover of an arc horn of a series of insulators installed on each phase of a high-voltage transmission line connecting a circuit breaker, and at both ends of the transmission line. The transmission line separated by opening a circuit breaker is closed and grounded at high speed to extinguish the electromagnetic induction current arc from the other phase or line that continues in the insulator series, and then the opening operation. By performing the above, in a high-speed reclosed earthing switch equipped with a puffer type arc-extinguishing chamber and its operating device that enables re-power transmission by reclosing the circuit breaker, in the operating device of the puffer-type arc extinguishing chamber, A control means for controlling the speed of the contact opening operation is provided, and the control means is configured to obtain a pressure increase value capable of interrupting the electromagnetic induction current when opening the contact.
The high-speed re-closing earthing switch is characterized in that the opening operation is temporarily decelerated from the vicinity of the opening position, and the opening operation is accelerated from the second opening position at the end of opening.