JPH06310001A - High speed grounding switch - Google Patents

Abstract

PURPOSE:To provide a highly reliable, compact, and economical high speed ground switch which can shut induced current which does not become zero for several cycles in high voltage power transmission lines. CONSTITUTION:A high speed grounding switch is provided with a puffer cylinder 16 which forms cylinder capacity part C and a puffer-shape arc extinguishing chamber 7 having a puffer piston 19. The puffer piston 19 has a recessed part, which is projected out of the cylinder capacity part C and forms an additional capacity part D, at the tip face of the part which forms the cylinder capacity part C. Or, the puffer piston 19 has auxiliary capacity parts E, F communicated with the cylinder capacity part C in the rear part of the tip face. Or, the puffer piston 19 has a recessed part which is projected out of the cylinder capacity part C and forms an additional capacity part D at the tip face and an auxiliary capacity part F which is communicated with the cylinder capacity part C at the rear part of the tip face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a high-voltage power transmission line for electric power, continues to the arc horn after eliminating a ground fault caused by a reverse flashover of an insulator arc horn of the transmission line by a line circuit breaker. High-speed that enables the electromagnetic induction current arc to be extinguished by a high-speed closing operation that cooperates with the switching operation of the circuit breaker, and interrupts the induced current by an immediate opening operation to re-transmit power by reclosing the circuit breaker. Regarding the ground switch.

[0002]

2. Description of the Related Art When a single-phase reclose is performed on a UHV transmission line of 1100 kV or the like, electromagnetic induction current from another phase is larger than that of a 500 kV transmission line. Even after the circuit is opened, the electromagnetic induction from the other phase of the same transmission line circuit does not extinguish the arc of the arc horn of the tower-insulator series, causing a problem that power transmission cannot be resumed. As a countermeasure against this, when reclosing the circuit breaker, the earthing switch is closed at high speed to extinguish the reverse flash arc of the arc horn, and then immediately opened to enable the circuit breaker to be closed again. A system to do was needed.

The background to the need for such a system is briefly illustrated. FIG. 6 is a conceptual diagram of a power transmission system in which the above problems occur. In the figure, 1 is a bushing at the switchgear entrance of the substation, 2 is a transmission line, 3 is a steel tower, 4 is a lightning strike,
5 is a lightning discharge arc. Further, FIG. 7 is a sequence diagram showing an operation sequence of system components. Here, for example, in a UHV tower group as shown in FIG. 6, it is assumed that a reverse flashover has occurred in the middle phase of the transmission line of the arc horn shown in the figure due to a lightning strike, etc. A case where the reclosing operation by the switch (GCB) and the high speed earthing switch (HSES) is carried out according to the sequence diagram shown in FIG. 7 will be described. In this case, the faulty line receives electromagnetic induction from the healthy phase of the same line and the other lines connected together, so after closing the HSES installed at the substations at both ends of the transmission line,
An electromagnetic induction current as shown in FIG. 8 flows through SES.
In order to cut off this current by HSES, if HSES is opened and the faulty transmission line is released from the grounded state, HSES
As shown in FIG. 9, a transient recovery voltage in which a transient phenomenon component of the electric circuit and an electrostatic induction voltage received by the faulty transmission line from another line are superimposed is applied between the contacts. These FIG. 8 and FIG.
The conditions such as relatively large current, relatively large rate of rise, and transient recovery voltage of high crest value as shown in Fig. 4 are necessary for the earthing switch with the parallel cut arc-extinguishing chamber that opens and closes the rod-shaped contact in SF ₆ gas. It cannot be shut off, and it is necessary to have a puffer type arc extinguishing chamber as well as a circuit breaker.

FIG. 1 is a sectional view showing an outline of a general structure of a high-speed grounding switch equipped with a puffer type arc extinguishing chamber. In this figure, reference numeral 6 is a grounding container in which a puffer type arc-extinguishing chamber 7, a conductor 8 and the like are housed. 9 is
An operating device for opening and closing the movable part of the puffer arc-extinguishing chamber 7, 9a in the operating device is a hydraulic cylinder including a control valve, and 10 is a movable part of the puffer-type arc extinguishing chamber 7 and the operating device. It is a link portion provided between and converting the contact length. Insulating spacers 11a and 11b fix the conductor 8 in the ground container 6. Further, reference numeral 12 is a grounding terminal portion, and when the grounding switch is closed, a conductor 8 is connected to the grounding terminal portion 12 via a puffer arc-extinguishing chamber portion 7, whereby the conductor 8 is grounded. Although such a main configuration is the same as that of the puffer type gas circuit breaker, since the above-mentioned breaking duty is much lighter than that of the circuit breaker, the breaking can be performed at a low cylinder pressure rise.

Meanwhile, when the reclosing operation is performed in the sequence shown in FIG. 7, as shown in the current change diagram of FIG. 10, of the two phases other than the middle phase which is the ground fault accident occurrence phase. If a ground fault accident (follow-up failure) occurs with a time difference in one phase (upper phase in this example) and the timing of the follow-up failure coincides with the opening timing of the high-speed grounding switch, the high-speed grounding switch by electromagnetic induction The passing current has a waveform that does not form a current zero point for several cycles, as shown in part A of FIG. Normally, the interruption of the alternating current in the switch is achieved only at the current zero point, so the current is not interrupted until the fault current of the other phase is eliminated and the current zero point is formed. As a technique for shutting off such a current when a current zero point is formed after several cycles, for example, a grounding switch provided with a puffer type arc extinguishing chamber as shown in FIG. 11 has been proposed (special feature: Japanese Patent Application No. 4-285901). The conventional grounding switch will be described below.

That is, FIG. 11 shows a state at the end of the opening operation of the grounding switch. In this figure, A is a fixed contact portion, which is composed of a fixed contact 13 and a shield 14a arranged inside and outside, and is fixed to the conductor 8 (FIG. 1) described above. Further, B is a movable contactor portion, which is a puffer cylinder 16 attached to the outer periphery of a cylindrical operation rod 15 connected to the operation device 9 (FIG. 1) described above, and the inside and outside of the tip end portion of this puffer cylinder 16. It is composed of a movable contactor 17 and an insulating nozzle 18 attached to the. A puffer piston 19 is inserted in the puffer cylinder 16, and a tip end surface of the puffer piston 19 forms a cylinder volume portion C serving as a gas compression chamber in the puffer cylinder 16. Further, a shield 14b is arranged outside the puffer cylinder 16. The puffer piston 19 and the shield 14b are fixed to the above-described grounding container 6 (FIG. 1) via an insulating member or the like, and the movable contactor portion B is movable with respect to this fixed portion. Has been done.

The grounding switch of FIG. 11 having such a structure operates 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 shown by the dotted arrow in the drawing is generated in the nozzle portion, and this gas flow causes the fixed contact 13 and the movable contact 13 to move. The arc generated between 17 is extinguished. After the completion of the contact opening, the insulation between the fixed contactor portion A and the movable contactor portion B is secured by the effect of the shields 14a and 14b. The dotted line in FIG. 11 indicates the movable contact 17 in the closed state.
The positions of the insulating nozzle 18 and the like are shown.

More specifically, the puffer-shaped arc-extinguishing chamber of the earthing switch of FIG. 11 is formed in the puffer cylinder 16 by the tip end surface of the puffer piston 19 at the end of the opening as shown in FIG. the length L _O of the cylinder volume C is the volume at the time of interruption of the cylinder volume C is configured to be 15 to 50% of the volume at closing. In addition to this, by appropriately adjusting the cross-sectional area of the puffer cylinder 16, the time width of the pressure increase is sufficiently widened with respect to the shutoff duty. FIG. 12 shows the stroke (opening movement characteristic) and the pressure increase characteristic of the puffer cylinder during the opening operation of the earthing switch of FIG. In this figure, X ₀ is the opening position. When the separation distance (L) from the opening position is sufficiently large, the lower limit of the pressure increase value that can cut off the current and voltage conditions as shown in FIGS. 8 and 9 is Δp _1a.
(Initial contact opening), Δp _1b (End contact opening).
As can be seen from the fact that it is used in a gas circuit breaker, since the puffer-type arc-extinguishing chamber has excellent breaking performance, it is relatively easy to extinguish the electromagnetic induction current whose current value is 2000A to 3000A. Yes, the arc can be extinguished with a low pressure rise value (Δp _1a , Δp _1b ) as shown in the figure.

However, when the electromagnetic induction current as shown in FIG. 8 is extinguished in this way, a high transient recovery voltage as shown in FIG. 9 is applied, so the separation distance (L) is increased. If is not large enough, the block will not succeed. In this case, in FIG. 12, the separation distance L at the opening position X ₁ at which the lower limit pressure increase value Δp _1a that can be interrupted at the initial stage of opening is obtained.
₁ is not large enough to successfully block,
Further, the contact opening operation proceeds, and it becomes possible to disconnect for the first time at the opening distance L ₂ . Therefore, the time from the opening position X ₀ to the opening position X ₂ of the separable distance L ₂ capable this blocking is obtained, a blocking shortest possible arcing time Ta _min, from the opening position X _0, opening Lower limit pressure rise value Δ that can be shut off at the end
The time until p _1b is obtained is the maximum arc time Ta _max that can be interrupted. The time from the opening position X ₂ until the pressure increase value Δp _1b is obtained is the arc time width Tw that can be interrupted. With the configuration shown in FIG. 11, an arc time width Tw capable of being interrupted for about 4 cycles is obtained, whereby the zero-miss current as described above can be interrupted.

[0010]

By the way, in the earthing switch of FIG. 11, in order to sufficiently increase the cylinder volume at the shut-off position, the inside of the puffer cylinder 16 at the end of opening as shown in FIG. It is necessary to increase the length L _O of the cylinder volume C. In this case, the movable contactor portion B is supported by the tip end support portion 19a and the rear support portion 19b on the inner circumference of the puffer piston 19 that are in contact with the outer peripheral surface of the operation rod 15 so as to hold the central axis thereof. . In such a support structure, the cylinder volume C of the puffer cylinder 16 at the end of opening
When the length L _o of the puffer piston 19 is large, the weight of the portion of the puffer cylinder 16 on the tip end side of the support point by the tip end support portion 19a of the puffer piston 19 becomes large, and thus the tip end support portion 19a of the puffer piston 19 is attached. The bending moment applied increases. Therefore, the supporting state of the movable contactor portion B becomes unstable, and as a result, it becomes difficult to maintain the coaxial state between the movable contactor portion B and the fixed contactor portion A, and sliding between the contactors 13, 17 and the like. The parts are easily damaged by excessive load.

Further, the length L _S behind the support point of the tip end support portion 19a of the puffer cylinder 16 at the end of opening is required to be a certain length or more for performing the closing operation, so the cylinder volume If the length L _O of part C becomes longer, the total length L _CT of puffer cylinder 16 is extended. Thus, when the total length L _CT of the puffer cylinder 16 becomes long,
The puffer-type arc-extinguishing chamber becomes larger, leading to a larger grounding switch. And when the device becomes large in this way,
There is also a problem that the manufacturing cost increases because a large material is required and the processing work becomes difficult accordingly.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
An object of the present invention is to provide a high-speed grounding switch which is capable of interrupting an induced current that does not form a current zero point for several cycles in a high-voltage transmission line, has high reliability, is small, and is inexpensive.

[0013]

A high-speed grounding switch of the present invention is provided with a puffer-type arc-extinguishing chamber having a puffer cylinder and a puffer piston that form a cylinder volume portion that serves as a gas compression chamber, and is connected to a power line suspension insulator string. In the case of a one-line ground fault due to a reverse flashover of the arc horn, the circuit breakers at both ends of the power transmission line are opened to close the grounded transmission line at high speed to maintain the contact with the insulator series. In a high-speed grounding switch capable of re-transmitting power by re-closing the circuit breaker by extinguishing an electromagnetic induction current arc from another phase and another line and then performing an opening operation, particularly the puffer type The puffer piston of the arc extinguishing chamber is configured to have certain characteristics.

That is, first, in the high-speed grounding switch according to the first aspect, the puffer piston of the puffer-shaped arc-extinguishing chamber has a tip end surface thereof forming the cylinder volume,
It is characterized by having a recess forming an additional volume protruding from the cylinder volume. The high-speed earthing switch according to claim 2, wherein the puffer piston of the puffer-shaped arc-extinguishing chamber communicates with the cylinder volume section at a rear portion of a tip end surface thereof that forms the cylinder volume section. It is characterized by having. Further, claim 3
The high-speed grounding switch according to claim 1, wherein the puffer piston of the puffer-shaped arc extinguishing chamber has a recessed portion that forms an additional volume portion protruding from the cylinder volume portion at a tip surface thereof that forms the cylinder volume portion. Further, it is characterized in that a sub volume portion communicating with the cylinder volume portion is provided at a rear portion of the tip end surface.

[0015]

In the high speed earthing switch of the present invention having the above construction, the following operation is obtained. First, in the structure of claim 1, by providing a concave portion forming an additional volume portion protruding from the cylinder volume portion on the tip end surface of the puffer piston, the length of the cylinder volume portion is shortened by the amount of the additional volume portion. can do. Further, in the structure of claim 2, by providing a sub-volume portion communicating with the cylinder volume portion at the rear portion of the tip end surface of the puffer piston, the length of the cylinder volume portion can be shortened by the amount of the sub-volume portion. You can On the other hand, in the configuration of claim 3,
3. A puffer piston is provided with a concave portion for forming an additional volume portion protruding from the cylinder volume portion at the tip end surface thereof, and a sub volume portion communicating with the cylinder volume portion is provided at the rear portion of the puffer piston tip surface. And claim 2
It is possible to further reduce the length of the cylinder volume as compared with the case where only one of the additional volume and the sub-volume is provided as in the above configuration.

As described above, in the high speed earthing switch of the present invention, the length of the cylinder volume can be shortened while ensuring the required cylinder volume, so that the tip end support of the puffer piston in the puffer cylinder is supported. It is possible to reduce the weight of the portion on the tip side of the support point of the portion. As a result, the bending moment applied to the tip support portion of the puffer piston can be reduced, so that the movable contact portion can be stably supported.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments in which the present invention is applied to a high speed earthing switch as shown in FIG. 1 will be specifically described below with reference to FIGS. In this case, FIG. 1 is a sectional view showing an outline of a general configuration of a high-speed grounding switch equipped with the puffer-shaped arc-extinguishing chamber, as described above. 2 to 5 are first to fourth parts of the high-speed grounding switch according to the present invention.
It is a figure which shows each Example, and is a sectional view which shows the state at the time of the completion | finish of the contact opening operation of the puffer type arc-extinguishing chamber.

(1) First Embodiment ... FIG. 2 The basic structure of the first embodiment shown in FIG. 2 is the same as that of the conventional example shown in FIG. That is, in FIG. 2, A is a fixed contactor portion, and the fixed contactor 13 is arranged inside and outside.
And the shield 14a and the conductor 8 described above.
(Fig. 1). Further, B is a movable contactor portion, which is a puffer cylinder 16 attached to the outer periphery of a cylindrical operation rod 15 connected to the operation device 9 (FIG. 1) described above, and the inside and outside of the tip end portion of this puffer cylinder 16. It is composed of a movable contactor 17 and an insulating nozzle 18 attached to the. A puffer piston 19 is inserted in the puffer cylinder 16, and the puffer cylinder 16 is inserted by the tip end surface of the puffer piston 19.
A cylinder volume C that serves as a gas compression chamber is formed therein. Further, a shield 14b is arranged outside the puffer cylinder 16. The puffer piston 19 and the shield 14b are fixed to the above-described grounding container 6 (FIG. 1) via an insulating member or the like, and the movable contactor portion B is movable with respect to this fixed portion. Has been done.

In addition to the above-mentioned structure, in this embodiment, the puffer piston 19 is provided with a concave portion having a depth L _D at the tip end surface thereof, whereby the additional volume protruding from the cylinder volume portion C is provided. The part D is formed. In this case, the depth L _{D of the} recess, which is the length of the additional volume _D, is generally desired to be 15 mm or more. The dotted lines in the figure show the positions of the movable contactor 17, the insulating nozzle 18, etc. in the closed state, as in FIG.

The operation of this embodiment having the above construction is as follows. That is, in this embodiment, during the opening operation, the gas in the puffer cylinder 16 is compressed, and a gas flow in two directions as indicated by the dotted arrow in the drawing is generated in the nozzle portion. The arc generated between 13 and the movable contact 17 is extinguished. After the completion of the contact opening, the insulation between the fixed contactor portion A and the movable contactor portion B is secured by the effect of the shields 14a and 14b. In this case, the puffer cylinder 16 in this embodiment
Internal volume, namely cylinder volume C and additional volume D
If the combined volume of the above is the same as the volume of the cylinder volume portion C of the conventional example of FIG. 11, the stroke and pressure rise characteristics at the opening are the same as those of the conventional example shown in FIG. Become. Therefore, like the above-mentioned conventional example, the zero miss current that does not form the current zero point for several cycles can be cut off.

In particular, in the present embodiment, since the additional volume portion D protruding from the cylinder volume portion C is formed by providing the tip surface of the puffer piston 19 with the recess of depth L _D , the opening contact is made. When the volume in the puffer cylinder 16 at the end of the operation is set to the same volume as that of the conventional example of FIG. 11, the length L _O of the cylinder volume C is made shorter than that of the conventional volume by the additional volume D. You can Then, it is possible in this way to shorten the length L _O of the cylinder volume station C, a in the puffer cylinder 16, is smaller than a conventional weight of the distal portion from the support point by the tip support portion 19a of the puffer piston 19 be able to. As a result, the bending moment applied to the tip end supporting portion 19a of the puffer piston 19 can be reduced, so that the movable contact portion B can be stably supported.

As described above, in this embodiment, since the movable contactor portion B can be stably supported, it is easy to maintain the coaxial state between the movable contactor portion B and the fixed contactor portion A. Therefore, unlike the prior art, an unreasonable load is not applied to the sliding parts such as between the contacts, so that the damage due to the unreasonable load can be prevented. In addition, in the present embodiment, as described above, the length of the cylinder volume portion C can be made shorter than in the conventional case, and accordingly, the puffer cylinder 16 is correspondingly.
The total length of can be made shorter than before. Therefore,
The puffer-type arc-extinguishing chamber can be made smaller than before, and the high-speed grounding switch as a whole can be made smaller. As described above, as a result of being able to miniaturize the device, the material to be used can be miniaturized, and the processing work can be correspondingly facilitated, so that there is an advantage that the manufacturing cost can be reduced.

(2) Second Embodiment ... FIG. 3 The basic structure of the second embodiment shown in FIG. 3 is the same as that of the first embodiment, but in this embodiment, the additional volume D
Instead of providing the sub-volume section E, a sub-volume section E is provided at the rear portion of the tip end surface of the puffer piston 19.
Are communicated with the cylinder volume C through a communication hole 19c provided in the tip end surface of the puffer piston 19. In this case, the sub volume E is formed so as to be surrounded by the inner peripheral surface of the puffer piston 19 and the outer peripheral surface of the operating rod 15. The rest of the configuration is the same as that of the first embodiment.

In the present embodiment having the above-mentioned structure, if the combined volume of the cylinder volume C and the sub volume E is the same as the volume of the cylinder volume C of the conventional example of FIG. The stroke and pressure rise characteristics at the time of opening are similar to those of the conventional example shown in FIG. Therefore, as in the first embodiment, the zero miss current that does not form the current zero point for several cycles can be cut off.

In particular, in this embodiment, since the sub volume E communicating with the cylinder volume C is provided at the rear of the tip end surface of the puffer piston 19, the volume inside the puffer cylinder 16 at the end of the contact opening operation. and when the same volume as the conventional example of FIG. 11, an amount corresponding sub volume E, can be made shorter than the conventional length L _O of the cylinder volume C. And thus, the length L _O of the cylinder volume C
Since the length can be shortened, the movable contact portion B can be stably supported as in the first embodiment.

Therefore, similarly to the first embodiment, it becomes easy to maintain the coaxial state between the movable contactor portion B and the fixed contactor portion A, and an unreasonable load is applied to the sliding portion between the contactors. Therefore, it is possible to prevent the occurrence of damage due to an unreasonable load. Further, as in the first embodiment, the cylinder volume C
Since the total length of the puffer cylinder 16 can be shortened as much as that of the conventional one, the puffer arc extinguishing chamber can be downsized and the high-speed grounding switch as a whole can be downsized. As a result of being able to miniaturize the apparatus in this way, the material to be used can be miniaturized, and the processing work can be correspondingly facilitated, as in the first embodiment, thus reducing the manufacturing cost.

(3) Third embodiment ... FIG. 4 The basic construction of the third embodiment shown in FIG. 4 is the same as that of the second embodiment, but in this embodiment, the rear part of the puffer piston 19 is used. The sub-cylinder 20 is attached to the outer peripheral part of the sub-cylinder, and the sub-volume F is formed so as to be surrounded by the inner peripheral surface of the sub-cylinder 20 and the outer peripheral surface of the puffer piston 19. The sub volume F is provided with a communication hole 19c provided in the tip surface of the puffer piston 19.
Through the cylinder volume C. Further, an airtight seal portion 19d is provided between the sub cylinder 20 and the puffer piston 19, whereby the airtight seal of the sub volume portion F is held. The other configurations are the same as those of the second embodiment.

In this embodiment having the above-mentioned structure, the position of the sub-volume portion F is different from that of the second embodiment only in design, and substantially the same structure as that of the second embodiment is used. It can be said to have. That is, in this embodiment, similarly to the second embodiment, an amount corresponding sub volume F, it can be made shorter than the conventional length L _O of the cylinder volume C. Therefore, also in this embodiment, the same effect as in the second embodiment can be obtained.

(4) Fourth Embodiment ... FIG. 5 The fourth embodiment shown in FIG. 5 has a configuration in which the first embodiment and the third embodiment are combined. That is, as shown in FIG. 5, a recessed portion having a depth L _D is provided in the tip end surface of the puffer piston 19, whereby the cylinder volume portion C is formed.
An additional volume portion D protruding from the puffer piston 19 is formed, and a sub volume portion F is provided at the rear portion of the tip surface of the puffer piston 19. The sub volume portion F is provided on the tip surface of the puffer piston 19. It communicates with the cylinder volume C through the communication hole 19c. Further, an airtight seal portion 19d is provided between the sub cylinder 20 and the puffer piston 19, whereby the airtight seal of the sub volume portion F is held. The rest of the configuration is the same as that of the first embodiment.

In the present embodiment having the above-mentioned structure, the total volume of the puffer cylinder 16 is the total volume of the cylinder volume C, the additional volume D and the sub volume F. Therefore, if the total volume in the puffer cylinder 16 is set to be the same as that of each of the above-described embodiments, the same characteristics as those of each of the above-described embodiments can be obtained, and the zero-miss current that does not form the current zero point for several cycles can be cut off. be able to.

Particularly, in this embodiment, since both the additional volume D and the sub volume F are formed in the puffer cylinder 16, the volume inside the puffer cylinder 16 at the end of the contact opening operation is When the volume is the same as that of each embodiment, only the additional volume D or the sub-volume F
Amount corresponding, it is possible to further shorten the length L _O of the cylinder volume C of. And thus, it is possible to further shorten the length L _O of the cylinder volume station C, a said compared to each embodiment, it is possible to support the movable contact portion B more stably.

Therefore, as compared with the above-mentioned respective embodiments, it becomes easier to maintain the coaxial state between the movable contact portion B and the fixed contact portion A, and an unreasonable load is applied to the sliding portion between the contact portions. Therefore, the occurrence of damage due to an unreasonable load can be further prevented. Further, the puffer cylinder 16 can be further shortened by the length of the cylinder volume portion C as compared with the above-mentioned respective embodiments, so that the puffer type arc extinguishing chamber can be further downsized and the high speed grounding can be achieved. The entire switch can be further miniaturized. As a result of further downsizing of the apparatus, the material to be used can be further downsized as compared with each of the above-mentioned embodiments, and the working operation can be correspondingly facilitated, so that the manufacturing cost can be further reduced.

(5) Other Embodiments The present invention is not limited to the above-mentioned embodiments, and the specific size and shape of the additional volume portion can be appropriately selected, and the length thereof is less than 15 mm. Even if the length is not set, a certain effect can be obtained. Further, the sub-volume portion may be arranged at the rear portion of the tip end surface of the puffer piston, and its specific configuration can be freely changed. Furthermore, various combinations of additional volume and sub-volume can be selected,
For example, a configuration in which the additional volume portion of the first embodiment and the sub-volume portion of the second embodiment are combined can be considered.

[0034]

As described above, in the present invention, an additional volume portion is formed on the tip surface of the puffer piston, or a sub volume portion is formed on the rear portion of the tip surface of the puffer piston, or By the improvement of the simple structure of forming both, the volume of the additional volume, or
It is possible to shorten the length of the cylinder volume by the volume obtained by adding the volume of the sub volume or both of them. Therefore, the movable contact can be supported stably, damage to the sliding parts such as between the contacts can be prevented, and the total length of the puffer cylinder can be shortened compared to the conventional type. The arc-extinguishing chamber can be downsized, and the high-speed grounding switch can be downsized as a whole. Therefore, according to the present invention, it is possible to provide a high-speed grounding switch which is capable of interrupting an induced current that does not form a current zero point for several cycles in a high-voltage transmission line, and is highly reliable, small-sized and inexpensive. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an outline of a general configuration of a high-speed grounding switch equipped with a puffer type arc extinguishing chamber.

FIG. 2 is a view showing a first embodiment of a high-speed earthing switch according to the present invention, and is a sectional view showing a state at the end of the opening operation of the puffer arc extinguishing chamber.

FIG. 3 is a diagram showing a second embodiment of the high-speed earthing switch according to the present invention, and is a sectional view showing a state at the end of the opening operation of the puffer arc extinguishing chamber.

FIG. 4 is a view showing a third embodiment of the high-speed earthing switch according to the present invention, and is a sectional view showing a state at the end of the opening operation of the puffer arc extinguishing chamber.

FIG. 5 is a view showing a fourth embodiment of the high-speed earthing switch according to the present invention, and in particular, a sectional view showing a state at the end of the opening operation of the puffer arc extinguishing chamber.

FIG. 6 is an explanatory diagram illustrating a function of a system of a high-speed earthing switch to extinguish a reverse flashover arc of an insulator string in a high-voltage transmission system.

FIG. 7 is an operation sequence diagram of the high-speed ground switch.

FIG. 8 is a current waveform diagram showing an electromagnetically induced current and an electrostatically induced current from the other phase to the operating phase of the high speed earthing switch.

FIG. 9 is a voltage waveform diagram showing a transient recovery voltage when the high-speed grounding switch is opened.

FIG. 10 is a current waveform diagram showing a current flowing through each phase of the high-speed grounding switch.

FIG. 11 is a view showing an example of a conventional high-speed grounding switch, and in particular, a cross-sectional view showing a state of the puffer type arc-extinguishing chamber at the end of the opening operation.

12 is a conventional high-speed grounding switch of FIG. 11 and FIGS.
FIG. 6 is a characteristic diagram showing the stroke and the pressure increase characteristic of the puffer cylinder during the opening operation of the high-speed grounding switch according to the present invention in FIG. 5.

[Explanation of reference numerals] 6 ... Ground container 7 ... Puffer type arc extinguishing chamber 8 ... Conductor 9 ... Operating device 9a ... Hydraulic cylinder 10 ... Link part 11a, 11b ... Insulating spacer 12 ... Ground terminal part 13 ... Fixed contact 14a, 14b ... Shield 15 ... Operation rod 16 ... Puffer cylinder 17 ... Moving contact 18 ... Insulation nozzle 19 ... Puffer piston 19a ... Tip support part 19b ... Rear support part 19c ... Communication hole 19d ... Airtight seal part 20 ... Sub cylinder A ... Fixed contact Child part B ... Movable contact part C ... Cylinder volume part D ... Additional volume part E, F ... Sub volume part

Claims (3)

[Claims] 1. A puffer-type arc extinguishing chamber having a puffer cylinder and a puffer piston that form a cylinder volume that serves as a gas compression chamber, and is provided when a one-line ground fault occurs due to a reverse flashover of an arc horn of a power line suspension insulator series. By turning off the circuit breakers at both ends of the power transmission line and closing the grounded transmission line at high speed, the electromagnetic induction current arcs from other phases and lines connected to the insulator series are extinguished. Arc,
A high-speed grounding switch that enables re-power transmission by re-closing the circuit breaker by performing an opening operation thereafter, wherein the puffer piston of the puffer-shaped arc-extinguishing chamber forms a tip end thereof that forms the cylinder volume. A high-speed grounding switch, characterized in that the surface has a concave portion that forms an additional volume portion that projects from the cylinder volume portion. 2. A puffer-type arc extinguishing chamber having a puffer cylinder and a puffer piston that form a cylinder volume serving as a gas compression chamber, and when a one-line ground fault occurs due to a reverse flashover of an arc horn of a power line suspension insulator series, By turning off the circuit breakers at both ends of the power transmission line and closing the grounded transmission line at high speed, the electromagnetic induction current arcs from other phases and lines connected to the insulator series are extinguished. Arc,
A high-speed grounding switch that enables re-power transmission by re-closing the circuit breaker by performing an opening operation thereafter, wherein the puffer piston of the puffer-shaped arc-extinguishing chamber forms a tip end thereof that forms the cylinder volume. A high-speed grounding switch having a sub-volume section communicating with the cylinder volume section at a rear portion of the surface. 3. A puffer-type arc extinguishing chamber having a puffer cylinder and a puffer piston that form a cylinder volume that serves as a gas compression chamber, and when a one-line ground fault occurs due to a reverse flashover of an arc horn of a power line suspension insulator series, By turning off the circuit breakers at both ends of the power transmission line and closing the grounded transmission line at high speed, the electromagnetic induction current arcs from other phases and lines connected to the insulator series are extinguished. Arc,
A high-speed grounding switch that enables re-power transmission by re-closing the circuit breaker by performing an opening operation thereafter, wherein the puffer piston of the puffer-shaped arc-extinguishing chamber forms a tip end thereof that forms the cylinder volume. The surface has a recess forming an additional volume protruding from the cylinder volume,
A high-speed grounding switch having a sub-volume section communicating with the cylinder volume section at a rear portion of the tip end surface.