JP3369224B2 - High-speed reclosable earthing switch - Google Patents

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 such a failure due to a ground fault, the failure section may be set to have no voltage and the reverse flashover, which is the cause of the accident, may be extinguished. Specifically, it is effective to cause the circuit breakers at both ends of the failed transmission line to perform the reclosing operation. Here, the reclosing operation means that the contact is once opened, the failure section is made to have no voltage, the reverse flashover is extinguished, and then the operation is turned on again. By performing such a reclosing operation, re-power transmission can be performed 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 are about to be used as high voltage power transmission lines with the increase in power demand. 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. If the electrostatic electromagnetic 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 faulty section are opened, the reverse flashover is extinguished. Becomes difficult to do. Therefore, in a high-voltage transmission line such as a UHV system, it is necessary to install a high-speed reclosing grounding switch 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 location of the accident from the power transmission line by the circuit breakers at both ends, the high-speed reclosing grounding switch is turned on at high speed in cooperation with the switching operation of the circuit breaker, so that the electromagnetic horns that are continuously connected to the insulator arc horn are connected. The induced current arc is extinguished, and then the opening operation is performed immediately to interrupt the induced current, thereby enabling re-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. 10 is an explanatory diagram showing the configuration of this system. In the figure, 1 is a bushing at the switchgear entrance of the substation, 3 is a U
It is an HV type steel tower. A high-voltage transmission line 2 has three lines of an upper phase, a middle phase, and a lower phase, and is extended 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,
The power transmission line 2 is suspended from the steel tower 3 by the insulator string 3b. A breaker (G
CB) and a high speed reclosing ground switch (HSES). Note that 4 is a thundercloud and 5 is a thundercloud. In this system, when a thunder cloud 4 strikes one of the three power transmission lines 2, a thunder cloud 3 suspends the power transmission line 2.
A reverse flashover 3c occurs in the arc horn 3a of b, and a ground fault accident current flows from the power transmission line 2 to the tower 3 through the reverse flashover 3c, 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) will first perform the opening operation after the elapse of T1 time, which is the transmission line protection relay time. 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 reclosing earthing switch (HSES) is performed with the circuit breaker (GCB) being opened, As shown in FIG. 12, the electromagnetic induction current flowing through the high-speed reclosing earthing switch (HSES) is 2000A.
Also reaches. When the high-speed reclosed earthing switch (HSES) is used to break such a large current and the high-speed reclosing earthing switch (HSES) is opened to release the faulty transmission line from the grounded state, the high-speed reclosing As shown in FIG. 13, a transient recovery voltage obtained by superimposing a transient phenomenon component of the electric circuit and an electrostatic induction voltage received by the faulty transmission line from another line is applied between the ground switch (HSES) contacts. Such a relatively large current, a relatively large rate of rise, and a cutoff under the conditions of a transient recovery voltage of a high peak value make it possible to simply open and close a rod-shaped contactor in SF ₆ gas. A high-speed re-closed earthing switch (HSES) that cannot be interrupted by a switch and has a puffer-shaped arc-extinguishing chamber like a circuit breaker.
Is required.

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 drawing, a puffer arc extinguishing chamber 7 and a conductor 8 are housed in a grounding container 6. 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. A hydraulic cylinder (including a control valve) 9a is provided in the operating device 9. Also,
The conductor 8 has insulating spacers 11a, 11a at both ends thereof.
It is supported with respect to the grounding container 6 via b 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. Note that FIG. 2 shows a state at the end of the contact opening operation. 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 the insulating nozzle 18 is attached. 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.
Is provided, and the puffer piston 19 and the shield 14b are provided.
Are fixed to the ground container 1. Then, the puffer piston 19 and the shield 1 fixed in this way
The members 16 to 18 are configured to move integrally with respect to 4b.

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 L0 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 do not collide during the contact opening operation. It is set to a necessary and sufficient length. Its length is usually about 10 mm. Therefore, the volume V ₀ formed in the cylinder at that time has a small value.

FIG. 14 shows the stroke (opening movement characteristic) at the opening operation and the pressure rise characteristic in the puffer cylinder in the conventional high-speed reclosed earthing switch (HSES) as described above. In the figure, X ₀ indicates the opening start position, which is the minimum pressure increase value ΔP that can be shut off at the initial opening stage.
_The opening position at which _1a is obtained is X ₁ , the opening distance at that time is L _1, and the opening position at which the opening distance L ₂ can be interrupted if the pressure rise is sufficient is X ₂ . The minimum pressure increase value that can be interrupted at the end of opening is ΔP _1b .

Further, as is apparent from the fact that it is used in a gas circuit breaker, since the puffer type arc-extinguishing chamber has an excellent shut-off performance, it is relatively easy to extinguish the electromagnetic induction current of 2000A to 3000A. As shown in FIG. 14, 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 will not succeed unless the opening distance is sufficiently large. Further, in FIG. 14, the opening distance L ₁ when the minimum pressure increase value ΔP _1a that can be cut off at the initial opening is obtained is not sufficiently large to cut off, and is set to the opening distance L ₂ . Only then can it be shut off. Therefore, in this case, 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 is} opened. Minimum 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. Then, 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 that can be cut off is obtained at the end of opening is the breaking arc time width T _w. . 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.
However, compared to the circuit breaker, the high-speed reclosing ground switch (HSE
Since the shutoff of S) is easy, the shuttable pressure rise is low, and the shuttable time width can be widened to 20 ms to 30 ms.

[0012]

By the way, as shown in FIG. 10, the power transmission line 2 has an upper phase, a middle phase, and a lower phase.
Although a predetermined load current is flowing in each phase, it is assumed 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. The current flowing through each phase of the power transmission line 2 is as shown in the current change diagram of FIG. That is, as shown in FIG. 15, in the middle phase of the power transmission line 2, when a ground fault occurs T ₀₁
When an accident current flows only between the opening at the start T ₀₂ of the circuit breaker (GCB). However, the middle phase of the power transmission line 2 receives electrostatic electromagnetic induction from the upper and lower phases, which are other sound phases, 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. 15, after the time T ₀₃ when the switch is turned on, the ground fault fault current and the electromagnetic induction current, which include the DC component, are superimposed on the high-speed reclosing earthing switch, 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 reaches the zero point 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 is connected. 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 coincides with the opening timing of the middle-phase high-speed re-closed earthing switch (HSES) and also the back-up failure accident. When the current contains 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 in the upper phase flows in the middle-phase power transmission line, and the A-part in FIG. As shown, a zero miss current that does not form a current zero will flow in the medium-phase high-speed reclosed earthing switch (HSES) for several cycles.

It is much more difficult to cut off the 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 maintained until 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 conventional high-speed reclosing ground switch (HSE
Breakable arc time width Tw (Fig. 1)
4) is shorter than the time width until the current again forms the zero point, so that the conventional high-speed reclosed earthing switch (HSE)
It was not possible to interrupt such a current by S).

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

[0016]

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.

In the high speed reclosed earthing switch according to the first aspect of the present invention, the operating device for the puffer-type arc-extinguishing chamber is provided with an opening value capable of interrupting the electromagnetic induction current when the operating device is opened. It is characterized in that a buffering means adjusted so as to decelerate the opening operation from near the pole position is provided.

Further, the high-speed reclosing ground opening according to claim 2
The closure configures the puffer-type arc-extinguishing chamber such that the volume of the puffer cylinder at the end of opening is 15 to 50% of the volume at the time of closing the electrode. In addition, when the contact is opened, a buffering means is provided which is adjusted so as to decelerate the opening operation from the vicinity of the opening position where a pressure increase value capable of interrupting the electromagnetic induction current is obtained. .

Further, the high-speed reclosing ground according to claim 3
The switch is a high-speed reclosing circuit according to claim 1 or 2.
The grounding switch is characterized in that a control means for controlling the buffer means is provided.

[0020]

The operation of the present invention constructed as described above is as follows.

First, in the high-speed reclosing grounding switch according to the first aspect, by providing a predetermined buffer means,
When opening the puffer-type arc-extinguishing chamber, the opening operation can be slowed down from the vicinity of the opening position where a pressure rise value that can interrupt the electromagnetic induction current is obtained, so it is possible to extend the time until the end of opening. Therefore, it is possible to lengthen the arc duration that can be interrupted.

Further , the high-speed re-closed ground opening according to claim 2
In the closed device, in addition to the action and effect of claim 1,
It has the same action and effect. That is, by intentionally increasing the volume of the puffer cylinder at the end of contact opening, the pressure rise at the beginning of contact opening rises more slowly than before.
Its maximum value is also low. Therefore, it is possible to make the opening distance at which a pressure increase value that can be cut off at the initial stage of opening is obtained larger than the opening distance at which opening can be blocked at the initial stage of opening when the volume at the end of opening is not increased. Therefore, if a pressure increase value that can be interrupted at the initial stage of opening is obtained, it is possible to immediately interrupt. In this way, by intentionally increasing the volume of the puffer cylinder at the end of opening, it is possible to significantly slow down the rate of decrease in the pressure increase value after completion of opening. The width can be increased.

Further, in the high-speed reclosing earthing switch according to the third aspect of the present invention, when the puffer type arc-extinguishing chamber is opened, the control means controls the buffer means to shut off the electromagnetic induction current. Since it is possible to decelerate the opening operation from the vicinity of the opening position where is obtained, it is possible to lengthen the time until the end of the opening, and it is possible to lengthen the breakable arc time width.

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 for extinguishing the reverse flashover. Later, in another adjacent phase or other line that was put together,
High-speed re-closed grounding in the ground fault accident phase A back-up failure accident that coincides with the opening timing of the switch (HSES) occurs, and this back-fault failure current contains a large amount of direct current component, and the high-speed re-closed grounding in the ground fault phase Even if a zero-miss current that does not form a current zero for several cycles flows through the switch (HSES), the interruptable state can be maintained until the current again forms a zero, so at the current zero. The current can be cut off.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of a high-speed reclosing earthing switch (HSES) according to the present invention will be described below with reference to the drawings.

(Embodiment 1) Embodiment 1 of the present invention basically has a structure as shown in FIGS. 1 and 2, and this structure is as described above in the description of the prior art. That is, as shown in FIG.
A puffer-shaped arc extinguishing chamber 7, a conductor 8 and the like are housed in the grounding container 6. 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. A link portion 10 for converting the operation stroke to obtain a required opening contact length is provided. In the operating device 9, a hydraulic cylinder (including a control valve)
9a 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 to 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 structure as described above, the hydraulic cylinder portion provided in the operating device 9 of this embodiment is shown in FIG.
It is configured as shown in. In the figure, 9 _a1 is a cylinder, 9 _a2 is a piston connected to the operating rod 15 of the arc extinguishing chamber, 9 _a3 behind the piston is a buffer piston part, and 9 _a3
a4 is Hirakikyokuben, 9 _a5 are closing valve, 9b is an accumulator. In addition, from the rear end of the piston 9 _a2 to the buffer piston 9
The length L _dp to the rear end of _a3 is longer than the conventional length L _dp .

Here, the operation of the hydraulic cylinder portion provided in the operating device 9 of this embodiment will be described with reference to FIG. Fig. 3 shows the high-speed re-closed grounding switch (HS
It shows a state in which the opening force is applied to (ES). That is, in a state where the closing valve 9 _a5 is closed, Hirakikyokuben 9 when _a4 is opened, C _2, C ₃ parts high pressure oil of Hirakikyokuben 9 in the cylinder _a4
Is discharged to the low pressure section 9 _a6 from, C _2, C ₃ parts in the cylinder becomes lower pressure state. On the other hand, the high pressure oil is supplied from the accumulator 9b to the C ₁ portion located above the cylinder. As a result, the piston _9a2 moves downward in the figure, and the operating rod 15 of the arc extinguishing chamber portion also moves downward in the figure, so that the opening operation is started in the arc extinguishing chamber portion. When the rear end of the buffer piston 9 _a3 reaches the small diameter portion of the cylinder 9 _a1, oil of the cylinder large-diameter portion C ₂ parts will hardly be discharged, the pressure of C ₂ parts of soaring, the piston 9 _a2 Braking force (buffering force) works.

The characteristics of such a hydraulic cylinder unit, the length L _dp buffer piston 9 _a3 from the piston 9 _a2 formed so as to project rearward, it is configured longer than L _dp prior art,
Length Xd from the start position of the opening operation until the buffer force works
However, the characteristics shown in FIG. 4 are obtained by adjusting the stroke length to be approximately the same as the stroke length at which the pressure at which the induction current can be cut off is obtained in the arc extinguishing chamber.

Next, FIG. 4 will be described. Similarly to the conventional example, the opening contact start position is X ₀ , the opening contact position at which the minimum pressure increase value ΔP _1a that can be interrupted at the initial opening is obtained is X ₁ , and the opening contact distance at that time is L _1, and Opening distance L _{2 that} can be shut off
Let X ₂ be the opening position at which, and the minimum interruptable pressure increase value obtained at the end of opening be ΔP _1b . Here, the rear end portion of the buffer piston 9 _a3 reaches the inlet of the small-diameter portion of the cylinder 9 _a1, the position where damping force starts to work is Xd, Xd in this embodiment is approximately equal to X ₁ There is. For this reason,
A buffering force works from the vicinity of X1 where the pressure that can be cut off is obtained, and the opening movement is rapidly decelerated. In FIG. 4, the opening characteristic (stroke) in the conventional example is shown by a dotted line for comparison. Further, Xt in the figure is the total stroke from the opening start position to the end (stop) position of the high-speed reclosing grounding switch (HSES).

Next, the operation of this embodiment will be described.
That is, in the present embodiment, since the opening speed in the latter half of the opening operation can be reduced by the above-described action of the hydraulic cylinder provided in the operating device 9, as compared with the conventional characteristic shown in FIG. The maximum pressure rise is significantly reduced. However, since the time until the end of opening is greatly extended, the time until the minimum pressure rise value ΔP _1b (equal to ΔP _1a ) that can be cut off at the end of opening is obtained, that is, the minimum value that can be cut off. The duration of the pressure rise value is significantly extended.

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 from the opening start position X _0. The time until the minimum pressure rise value ΔP _1b that can be interrupted at the end of opening is the maximum arc time Ta _max that can be interrupted. Then, the opening position X ₂ that provides the opening distance L ₂ that can be cut off
From this point, the time until the minimum pressure rise value ΔP _1b that can be interrupted at the end of opening is obtained is the arc time width T _w that can be interrupted. In this case, the breakable arc time width T of the present embodiment
_w can be made 3 to 4 times longer than the arc time width of the breakable arc of the conventional example described above.

As described above, in the present embodiment, the breakable arc time width can be greatly extended as compared with the conventional case, so that even if the current zero point is not formed for several cycles as described above, the current zero point is restored. The pressure increase value that can be interrupted is maintained until it is formed, and the current interrupt can be performed at the current zero point. Therefore, 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.

(Second Embodiment) This embodiment is a modification of the first embodiment. That is, in Example 1, the operation rod on the arc extinguishing chamber side is directly connected to the piston in the drive cylinder via an insulating rod or the like.
In this embodiment, one lever 10a is arranged in the gas and the other lever 10b is connected via a link 10 arranged in the air. In the figure, 9a is a hydraulic cylinder portion, and _9a2 is a piston. Further, in this embodiment, the shock absorber 9c is provided outside the drive cylinder. That is, it is installed in the operating device 9 so that its piston portion is connected to the lever 10b on the air side. Further, as in the first embodiment, Xd in the figure indicates that the tip of the cushioning piston 9 _c3 has the cushioning device 9 _c after the opening operation is started.
Is the length to reach the small-diameter portion, that is, the length until the buffering force starts to work. Further, Xt is the total stroke from the opening start to the end (stop).

The operation and effect of this embodiment having such a configuration are the same as those of the above-mentioned first embodiment, and the explanation thereof will be omitted. When actually designing the high-speed re-closed earthing switch (HSES), use the existing hydraulic cylinder,
In some cases, it may be advantageous to provide the shock absorber (buffer means) separately, and in such a case, the configuration of this embodiment can be adopted.

(Embodiment 3) FIG. 6 is a view showing the structure of the main part of the puffer type arc extinguishing chamber in this embodiment, showing the state at the end of the contact opening operation. Since the basic configuration is similar to that of the first embodiment described above, features different from the first embodiment will be described below.
That is, in this embodiment, the gap L ₀ between the inner surface of the tip end portion of the puffer cylinder 16 and the end surface of the puffer piston 19 at the end of opening is intentionally made longer than in the conventional example. As a result, the volume inside the puffer cylinder 16 at the end of opening is significantly increased, and is specifically about 15% to 50% of the volume at closing. Note that, in FIG. 6, the positions of the puffer cylinder 16, the movable contact 17, the insulating nozzle 18, and the like when the electrodes are closed are shown by dotted lines. In this case, the gap between the inner surface of the tip end portion of the puffer cylinder 16 and the end surface of the puffer piston 19 when the pole is closed is indicated as L _c . Then, the cylinder volume at the time of closing is determined by the gap L _c at the time of closing.

Next, the operation of this embodiment will be described.
The solid line in FIG. 7 indicates the high-speed reclosing ground switch (HS) of this embodiment.
Fig. 6 shows the characteristics of the stroke (opening movement characteristic) during opening operation and the pressure increase in the puffer cylinder in ES). The contact opening characteristics are similar to those of the conventional example shown in FIG.

That is, in this embodiment, as described above, since the volume of the puffer cylinder 16 at the end of the contact opening is intentionally increased as compared with the conventional one, the pressure increase in the initial stage of the contact opening is larger than that of the conventional one. It rises slowly and its maximum value is low. As shown in FIG. 7, in the present embodiment, when the opening position where the minimum pressure increase value ΔP _1a that can be interrupted at the initial opening is obtained is X _2a and the opening distance at that time is L _2a , this opening is performed. electrode distance L _2a, the pressure rise in the conventional example already be larger than the opening distance L ₂ can block if enough. Therefore, if the pressure increase value ΔP _1a is obtained, it is possible to immediately shut off.

Further, in the present embodiment, the puffer cylinder 1
Since the volume of 6 is large, the decrease rate of the pressure increase after the completion of the contact opening is significantly slower than that of the conventional example. As a result,
As shown in FIG. 7, from the opening position X _{2a at which the} minimum pressure increase value ΔP _1a that can be shut off at the initial stage of opening is obtained to the minimum pressure increase value ΔP _1b that can be shut off at the final stage of opening. The time, that is, the breakable arc time width T _w1 is significantly longer than that in the conventional example. Therefore, also in this embodiment,
Similar to Examples 1 and 2, a breakable arc time width about 3 to 4 times longer than that of the conventional example can be obtained.

If the volume of the puffer cylinder 16 is made too large, the pressure rise will be too low to obtain the minimum pressure rise value that can be shut off. By setting the volume in the cylinder to about 15% to 50% of the closed volume, the above-described excellent action can be obtained without causing such a problem.

As described above, in the present embodiment as well, as in the first and second embodiments, the breakable arc time width can be greatly extended as compared with the conventional case, so that the current zero point is not formed for several cycles. Even when the zero-miss current flows, the pressure increase value that can be interrupted is maintained until the current zero is formed again, and the current can be interrupted at the current zero. Therefore, 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.

(Fourth Embodiment) This embodiment is the same as the first embodiment or the second embodiment and the third embodiment.
It is a combination of and. That is, in the configuration as shown in FIG. 6, the shock absorber in the operating device 9 is operated from the vicinity of the opening position where a pressure increase that can be interrupted is obtained, and the opening operation is decelerated. .

With this structure, the characteristics shown by the dotted line in FIG. 7 are obtained. That is, in FIG. 7, in addition to the characteristics of the third embodiment, in the high-speed reclosed earthing switch (HSES) of the present embodiment, the stroke (opening movement characteristic) and the pressure in the puffer cylinder during the opening operation. The characteristic of the rise is shown by the dotted line. As shown by this dotted line,
The rise of the pressure rise of this embodiment is slower than that of the third embodiment, and its maximum value is also lower. On the other hand, since the time to obtain the minimum pressure increase value ΔP _1a that can be cut off at the initial _stage of opening is almost the same time, the time _required to reach the minimum pressure increase value ΔP _1b2 that can be cut off at the end of opening is the same as the above-mentioned execution. Examples 1-
It is significantly longer than 3. That is, the breakable arc time width T _w2 becomes even longer, which is very advantageous.

As described above, also in this embodiment, as in the case of the first to third embodiments, the breakable arc time width can be greatly extended as compared with the conventional case, so that the current zero point is formed for several cycles. Even when a zero-miss current flows, the pressure increase value that can be interrupted is maintained until the current zero is formed again, and the current can be interrupted at the current zero. Therefore, 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.

Furthermore, in this embodiment, the above-mentioned first embodiment is used.
Since it is not necessary to decelerate significantly, there is also an advantage that the design of the buffer portion of the operating device 9 becomes easy. As a result, it is possible to realize a more efficient high-speed reclosing grounding switch as compared with the first to third embodiments.

(Embodiment 5) In this embodiment, an operating device 9 is constructed as shown in FIG. 8 in addition to the basic construction shown in FIG. 1 or 2. That is, the operating device 9 includes the drive source 21 and the drive rod 22 that drives the movable portion B of the puffer arc-extinguishing chamber 7 via the link portion 10 by the drive force of the drive source 21. A buffer device (buffer means) 23 is provided between the drive rod 22 and the drive rod 22 to reduce the operating speed of the drive rod 22 to reduce the speed of the movable portion B of the puffer arc-extinguishing chamber 7. Further, in the vicinity of the drive rod 22, by detecting the operating position of the drive rod 22, the open position for detecting the open position where the minimum pressure increase value capable of interrupting the electromagnetic induction current at the time of opening is obtained. Detector 24
Is provided. Further, this opening position detecting device 24
When the predetermined opening position is detected by the control device, the buffer device 23 is operated to decelerate the opening operation and control the buffer device 23 so as to lengthen the time until the completion of opening (control means). ) 25 is provided. Note that FIG. 9 is a flowchart showing the contact opening operation in this embodiment.

The operation of this embodiment having such a structure is as follows.
The operation is the same as that of the first embodiment, and the opening characteristic (stroke) and the pressure increase characteristic shown in FIG. 4 can be obtained. Further, the characteristics shown in FIG. 7 can be obtained by combining with Example 3 (a structure in which the cylinder volume is increased). Further, in the present embodiment, the shutoff position is detected and the shock absorber is controlled based on the result, so that more efficient characteristics can be obtained.

(Other Embodiments) The present invention is not limited to the above-described embodiments, and the specific details of the puffer arc-extinguishing chamber and its operating device can be selected as appropriate. That is, the specific configurations such as the buffering means, the contact opening position detecting means, and the controlling means can be selected as appropriate. For example, a timer may be used as the control means, and the operation of the buffering means may be set to start after a time corresponding to the time from the opening command time to the opening position for starting the operation of the buffering means. It is possible. In addition, including such a case, the contact opening position detection means is not always necessary.

[0050]

As described above, according to the present invention,
The operating device for the puffer-type arc-extinguishing chamber is provided with a buffering means for reducing the speed of the electrode opening operation, or the puffer-type arc-extinguishing chamber is provided with a volume of the puffer cylinder at the end of opening being 15 times the volume at the time of closing. ˜50%, or by providing a control means for controlling the buffer means, it is possible to cut off the induced current that does not form a current zero point for several cycles, and thereby a high-speed reclosing grounding switch. Can be provided.

[Brief description of drawings]

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

FIG. 2 is a high-speed reclosing ground switch (HSE) according to the present invention.
It is a figure which shows the structure of the principal part of S), and is a block diagram which shows a contact opening state.

FIG. 3 is a diagram showing a configuration of a drive cylinder in the first embodiment shown in FIG.

FIG. 4 is a diagram showing an operation in the first embodiment.

FIG. 5 is a diagram showing a configuration of a main part of an operating device according to a second embodiment.

FIG. 6 is a diagram showing a configuration of a main part of Example 3 and is a configuration diagram showing an open state.

FIG. 7 is a diagram showing the operation of the third embodiment and the operation of the fourth embodiment.

FIG. 8 is a diagram showing a configuration of a fifth embodiment.

FIG. 9 is a diagram showing a flowchart of the operation of the fifth embodiment.

FIG. 10 is an explanatory diagram showing the configuration of a protection system that employs a high-speed reclosing grounding switch.

FIG. 11 is an operation sequence diagram showing 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 reverse flashover.

FIG. 12 is a waveform diagram showing the characteristics of the electrostatic induction current and the electromagnetic induction current from the other phase to the operating phase of the high-speed reclosing earthing switch (HSES).

FIG. 13 is a transient recovery voltage waveform diagram when the high-speed re-closed earthing switch (HSES) is opened.

FIG. 14 is a diagram showing a stroke (opening movement characteristic) and a pressure increase characteristic in the puffer cylinder during the opening operation in the conventional high-speed reclosed earthing switch (HSES).

FIG. 15 shows changes in the current flowing through each phase of the high-speed reclosing earthing 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. Current waveform diagram

[Explanation of symbols]

GCB ... Circuit breaker HSES ... High-speed reclosing grounding switch 1 ... Bushing 2 ... Transmission line 3 ... Tower 6 ... Grounding container 7 ... Puffer arc extinguishing chamber 8. . conductor 9 ... operating device 9a ... hydraulic cylinder 9 _a1 ... cylinder 9 _a2 ... piston 9 _a3 ... buffer piston 9 _a4 ... Hirakikyokuben 9 _a5 ... closing valve 9b ... accumulator 9c ... shock absorber 9 _c1 ... cylinder 9 _c2 ... piston 9 _c3 ... shock absorbing piston 10 ... link parts 11a, 11b ... insulating spacer 12 ... ground terminal part 13 ... Fixed contacts 14a, 14b ... Shield 15 ... Operation rod 16 ... Puffer cylinder 17 ... Movable contact 18 ... Insulation nozzle 19 ... Puffer piston

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ikuo Miwa, Inoue Miwa 2-1-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Inside the Hamakawasaki Plant, Toshiba Corporation (72) Takeshi Yokota 1-1-1, Shibaura, Minato-ku, Tokyo Stock company Toshiba Head Office (56) Reference JP-A-60-119040 (JP, A) JP-A-2-15530 (JP, A) JP-A-61-139206 (JP, A) Actual development Sho-61- 51632 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01H 33/70-33/99 H02B 13 / 02,13 / 075 H02H 1/00-3/07

Claims (3)

(57) [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 high-speed re-closed grounding switch which is provided with a buffering means adjusted so as to decelerate the opening operation from the vicinity of the opening position where a pressure rise value capable of interrupting the electromagnetic induction current is obtained at the opening of the contact. vessel. 2. A high voltage transmission line connecting a circuit breaker, which is installed in each phase and is connected to both ends of the transmission line at the time of a one-line ground fault due to a reverse flashover of an arc horn of an insulator series provided on 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. In the high-speed reclosed earthing switch equipped with the puffer-type arc-extinguishing chamber and the operating device for enabling re-power transmission by re-closing the circuit breaker, the puffer-type arc-extinguishing chamber can be opened. The puffer cylinder at this time has a volume of 15 to 50% of the volume at the time of closing, and the puffer arc extinguishing chamber operating device comprises:
A high-speed re-closed grounding switch which is provided with a buffering means adjusted so as to decelerate the opening operation from the vicinity of the opening position where a pressure rise value capable of interrupting the electromagnetic induction current is obtained at the opening of the contact. vessel. 3. The high-speed reclosing grounding switch according to claim 1, further comprising control means for controlling the buffer means.