JPH06150790A - High speed re-closing earth switch device - Google Patents

Abstract

PURPOSE:To break certainly the induction current in a high voltage power transmission line even in the case the zero miss phenomenon has occurred in the induction current when a ground-short accident is generated in the power line, which is in multi-phase system, to cause the multi-phase re-closed condition. CONSTITUTION:A puffer type arc extinguishing chamber 2 includes a stationary contacting piece 10 installed on a main circuit conductor 3 in a sealed chamber 1 in which an arc extinguishing gas is encapsulated, a movable contacting piece 13 contacting and separating from this stationary contacting piece, and a grounding terminal part 7 connected with the movable contacting piece 13 and the sealed vessel. A resistor 9 of 0.1-1.5OMEGA is in series inserted between the current feed path of this arc extinguishing chamber 2 and the ground potential. It is so structured that the size of the dead volume between a puffer cylinder 15 and puffer piston 18 of the chamber 2 can be selected to 15-50% of the total cylinder capacity in the condition with perfect circuitry. An alternative structure is such that a damper device 21 is added to a conventional operating mechanism 4.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art With the recent rapid increase in power demand, a higher voltage 1100 kV class power transmission system is being put into practical use in place of the current 500 kV class power transmission system. In such a 1100 kV class UHV system transmission line, when a single phase reclosing is performed for a single phase ground fault due to a flashover of a tower-insulator-series arc horn, electromagnetic waves from other phases are generated rather than a 500 kV class transmission line. It is expected that the induced current will be much higher. Even after the circuit breakers (GCBs) of the substations at both ends are opened, the electromagnetic induction current from the other phase of the transmission line circuit is large, so that the arc of the arc horn of the tower-insulator series of the ground fault phase is large. It is expected that there will be a problem that the power will not be extinguished and power transmission cannot be resumed. In order to avoid such a problem, a line breaker (GC
When reclosing B), the high-speed reclosing ground switch (HSE
It is demanded to realize a system in which S) is forcibly closed at high speed to extinguish the reverse flash arc of the arc horn, and then immediately opened to reclose the circuit breaker.

A system for extinguishing a reverse flashover arc of an arc horn expected in a power transmission line of the above 1100 kV class will be specifically described with reference to FIGS. 9 to 15. First, as shown in FIG. 9, the high-speed reclosing earthing switch (HSES) is used to extinguish the reverse flashover arc of the insulator series in the high voltage transmission system to reclose the line breaker (GCB). It is a conceptual diagram which shows the system which enables. In FIG. 9, 23 is a bushing at the entrance of the switchgear of the substation, 24 is a power transmission line, 25 is a steel tower,
26 is a thundercloud and 27 is a lightning discharge arc. In addition, FIG.
FIG. 10 is an operation sequence diagram showing an operation order of the system components of FIG. 9.

Here, in FIG. 9, when a reverse flashover arc occurs in the arc horn of the middle phase of the transmission line due to lightning or the like in the UHV system tower group, the circuit breaker (GCB) and the high-speed reclosing circuit are used. It is assumed that the reclosing operation by the ground switch (HSES) is performed according to the sequence diagram shown in FIG. In this case, since the faulty line receives electromagnetic induction from the sound phase of the same line and from the other line connected in parallel, after closing the high-speed reclosed earthing switch (HSES) installed at the substations at both ends of the transmission line, An electromagnetic induction current as shown in FIG. 11 flows through the high-speed reclosing ground switch (HSES). In order to cut off this current with the high-speed re-closed earthing switch (HSES), the high-speed re-closing earthing switch (HSES) is opened to release the faulty transmission line from the grounded state. 12, a transient recovery voltage obtained by superimposing a transient phenomenon of the electric circuit and an electrostatic induction voltage received by the faulty power transmission line from another line is applied between the contacts. As shown in FIGS. 11 and 12, interruption of severe conditions such as relatively large current, relatively large rate of rise, and transient recovery voltage of high peak value simply opens and closes the rod-shaped contactor in SF ₆ gas. This cannot be achieved with a parallel cut type grounding switch, and it is necessary to have a puffer type arc extinguishing chamber as with a circuit breaker.

FIG. 13 is a block diagram showing the outline of the construction of an example of a high-speed reclosing grounding switch equipped with a conventional puffer type arc extinguishing chamber. In FIG. 13, reference numeral 1 is a ground tank, in which arc extinguishing gas is filled at high pressure, and a puffer arc extinguishing chamber 2 and a main circuit conductor 3 are housed therein. Reference numeral 4 denotes an operation mechanism for driving the movable part of the puffer arc extinguishing chamber 2 to open and close, and 5 is provided between the movable part of the puffer arc extinguishing chamber 2 and the operation mechanism 4 to convert the opening length. This is the link section. Insulating spacers 6a and 6b fix the main circuit conductor 3 in the ground tank 1. Reference numeral 7 is a ground terminal connected between the ground tank 1 and the puffer arc-extinguishing chamber 2. When the ground switch is closed, the ground terminal 7 is connected to the ground terminal 7 through the puffer-arc extinguishing chamber 2. The main circuit conductor 3 is connected and grounded.

FIG. 14 is a structural diagram showing the detailed structure of the puffer type arc extinguishing chamber of FIG. 13 and the state at the end of the contact opening operation. Here, 10 is a fixed contact portion, which is composed of a fixed contact 11 directly connected to the main circuit conductor 3 and a shield 12 arranged around the fixed contact 11. Reference numeral 13 denotes a movable contactor portion, which is a movable rod attached to the inside and outside of the cylindrical operation rod 14 connected to the operation mechanism 4, the puffer cylinder 15 attached to the periphery thereof, and the tip end portion of the puffer cylinder 15. Shield 1 attached to the outer periphery of contactor 16, insulating nozzle 17, and puffer cylinder 15.
A movable part having an integral structure constituted by 9 is provided.
A puffer piston 18, which is a fixed portion supported at a fixed position with respect to the ground tank 1, is inserted into the puffer cylinder 15 of the movable portion, and is configured to move relatively to the movable portion. . In this case, a dead volume V ₀ is provided between the puffer cylinder 15 and the puffer piston 18 so that they do not collide with each other when the contacts are completely opened. This dead volume V
₀ is usually a small value of about 10 mm to 20 mm in terms of stroke.

In FIG. 14, during the contact opening operation, the gas in the puffer cylinder 15 is compressed, and a gas flow in two directions as shown by the dotted arrow is generated in the nozzle portion, and the gas flows between the fixed contact 11 and the movable contact 16. The arc that occurs at is extinguished.
Also, after the contact opening operation is completed, the fixed side and movable side shields 1
Due to the effects of 2 and 19, insulation between the fixed contact portion 10, the movable contact portion 13 and the ground tank 1 is ensured, respectively.

FIG. 15 is a characteristic diagram showing the stroke (opening movement characteristic) and the increase in pressure in the puffer cylinder during the opening operation of the high-speed reclosing grounding switch of FIG. In this figure, x ₀ is the opening position. When the separation distance (L ₁ , L ₂ ) from the opening position is sufficiently large, the pressure increase value at the initial opening stage that can interrupt the conditions of current and recovery voltage as shown in FIGS. 11 and 12 is set. Let Δp _1a, and let Δp _1b be the pressure rise value at the end of opening that can interrupt the same conditions. As can be seen from the fact that it is used in a gas circuit breaker, the puffer-type arc-extinguishing chamber has excellent shut-off performance, so that arc-extinguishing of electromagnetic induction current at the level of 2000A to 3000A as shown in FIG. It is easy, and as shown in FIG. 15, the arc can be extinguished with a relatively low pressure increase Δp _1a , Δp _1b .

[0009] Nevertheless, this grounding switch has
Since not only a large electromagnetic induction current but also a high transient recovery voltage as shown in FIG. 12 is applied, if the opening distance is not sufficiently large, the interruption will not be successful. That is, in FIG. 15, the separation distance L ₁ at the position x ₁ at which the pressure increase value Δp _1a is obtained is not large enough to be blocked, and can be blocked only when the separation distance becomes L _2. Become. Therefore, in FIG. 15, the separation distance L from the opening position x _0
2 is the time up to the position x ₂ to be obtained, the shortest arcing time Ta _min capable of blocking, the time from the opening position x ₀ to a pressure increase value Delta] p _1b of the opening end can be obtained, the maximum arcing time Ta _max . Then, the time difference between the shortest arc time Ta _min and the longest arc time Ta _max becomes the interruptable arc time width Tw. It is sufficient that the breakable arc time width Tw is equal to or longer than the half-wave time of the induced current. However, since the high-speed reclosing grounding switch is easier to shut off than the circuit breaker, and the pressure rise value at which it can be shut off is relatively low, it is possible to widen the breakable arc time width Tw to about 20 to 30 ms. is there.

However, there is a possibility that the interruption cannot be achieved in a constant case with the interruption time arc width Tw of the conventional high-speed reclosing earthing switch as shown in FIG. That is, when the reclosing operation is performed in the operation sequence as shown in FIG. 10, as shown in the current waveform diagram of FIG. 16, of the two phases other than the middle phase, which is the ground fault accident occurrence phase, 1
A ground fault (follow-up failure) occurs with a time difference in the phase (upper phase in this example), and the timing of this follow-up failure overlaps with the opening timing of the high-speed reclosing grounding switch, and also the DC component of the follow-up failure accident current. , The passing current of the high-speed reclosing grounding switch by electromagnetic induction 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 at the current zero point, but the time width (interruptible arc) in which the interruptable blowing pressure of the conventional high-speed reclosing grounding switch as shown in FIG. 15 is maintained. Time width Tw)
Is shorter than the duration of the waveform that does not form such a current zero point, and the current zero point will not be formed again within the breakable arc time width Tw. Therefore, in order to achieve such interruption of the current, some measure for maintaining the blowing pressure capable of interrupting the expected induction current until the current of the induction current returns to the zero point. Need to be taken.

FIG. 3 shows an example in which the above measures are embodied. That is, in the high-speed reclosing grounding switch of FIG. 3, between the puffer cylinder 15 and the puffer piston 18, the full volume of the cylinder is less than 1 in the fully opened state.
The dead volume V ₁ is set so as to be 5% to 50%. FIG. 4 is a characteristic diagram showing the stroke (opening movement characteristic) and the characteristic of the pressure increase in the puffer cylinder during the opening operation of the high-speed re-closed circuit grounding switch of FIG. In addition, this FIG.
In the above, for the purpose of comparison, the pressure rise characteristic when the dead volume is small (the high-speed reclosing grounding switch of FIG. 14) is indicated by a broken line. From FIG. 4, since the dead volume increases, the time during which the breakable blowing pressure is maintained increases, and as a result, the _breakable arc time width T _w1 is smaller than the _breakable arc time width T _w1 when the dead volume is small. It can be seen that the time width T _w2 has increased significantly.

On the other hand, FIG. 17 shows a modification of the operating device in addition to the modification of the puffer-type arc-extinguishing chamber shape shown in FIG. 3 in order to increase the breakable arc time width. That is, in FIG. 17, a damper device 21 is added to the operation mechanism 4 that is normally used, and the damper device 21 is
It is connected to the link portion 5 via the main shaft 20. And
During the opening operation, the damper device 21 is operated in the latter half of the opening operation to reduce the opening speed of the movable contactor 13 of the puffer arc extinguishing chamber 2 in the latter half of the stroke. is there. By combining the improvement on the operation side with the improvement on the arc extinguishing chamber side as described above, as shown in FIG. 6, a larger _breakable arc time width T _w3 can be secured.

[0013]

By the way, when the reclosing operation is carried out in the operation sequence shown in FIG. 10, it is in the ground fault accident occurrence phase as shown in the current waveform diagram of FIG. Assuming a case where a ground fault occurs in one of the two phases (upper phase in this example) other than the middle phase, and the polyphase reclosing is forced, the following operation is performed. . That is, first, the middle-phase fault current, which has a ground fault, is first disconnected from the system by the middle-phase line circuit breaker, and the middle-phase high-speed reclosing ground switch is used to turn on the middle-phase transmission line. At this time, a direct current component that depends on the closing phase of the high-speed reclosing grounding switch is superimposed on the circulating current flowing through the high-speed reclosing grounding switch. This DC component becomes large when the current is applied in the vicinity of the peak value of the current flowing through the medium-phase transmission line before the injection. Normally, the fast reclosing earthing switch is closed for 500 ms and then reclosed according to an operating sequence. Then, in the time domain in which the middle-phase high-speed re-closed earthing switch is still turned on, if a ground fault occurs in the upper-phase transmission line, for example, the upper-phase high-speed re-closed earthing switch will be released as in the middle phase. Vessel works. When the high-speed re-closed grounding switch of the upper phase is turned on, a direct current component depending on the input phase is also superimposed on the circulating current flowing therethrough.

Here, assuming a case where both the high-speed reclosed earthing switches of the middle phase and the upper phase are turned on in such a phase as to generate a large direct current component in their respective circulating currents, the following constant values are given. Problems can occur. That is, at the moment when the high-speed re-closed earthing switch of the upper phase is turned on, the middle-phase recirculation current that is turned on earlier than that is zero-shifted, and further, the upper-phase recirculation current is zero. It has been pointed out that due to the electromagnetic shift phenomenon, the return current in the middle phase may eventually become a zero-miss current due to the electromagnetic induction phenomenon in the transmission lines of the middle and upper phases.

In this state, according to the operation sequence,
When the medium-phase high-speed reclosing earthing switch is about to open, the impedance of the medium-phase circulating current path is almost determined by the arc ignited between the transmission line and the middle-phase high-speed reclosing earthing switch. It will be a small value. Therefore, the DC component of the medium-phase circulating current (zero-miss current) is not rapidly attenuated, and the zero-miss state may continue for 100 ms or longer, as shown in FIG. However, interrupting the zero-miss current for 5 cycles or more is as follows.
This is not possible with conventional technology.

Furthermore, if the decay of the DC component in the zero-miss current is slow, the zero-miss state of the circulating current flowing in the middle phase continues until the upper-phase high-speed reclosing grounding switch is closed again after being closed. Possible modes. The zero-miss current duration in this mode depends on the closing time difference between the high-speed reclosed earthing switch of the middle phase and the upper phase. That is, if the upper-phase high-speed reclosing earthing switch is turned on immediately after the middle-phase high-speed reclosing earthing switch is turned on, both of them are closed again almost at the same time. The time during which the current to be interrupted during the opening operation of the reclosing earthing switch is a zero-miss current becomes short.

However, the high-speed reclosed earthing switch of the middle phase and the upper phase has a time difference t (t <500 m) of 5 cycles or more.
If the switches are sequentially turned on in s), the zero-miss current continues to flow to the middle-phase high-speed reclosed earthing switch that has been turned on for the time difference t, and then the zero point returns for the first time and shuts off. Become. As described above, even if a measure is taken to extend the breakable arc time of the high-speed re-closed earthing switch, maintaining it for 4 cycles (80 ms in a 50 Hz system) or more is not possible due to hardware restrictions. Difficult,
If the zero-miss current is eliminated within 4 cycles, it will be impossible to cut off. Therefore, the middle phase can be shut off for four cycles (50 cycles after the middle phase is turned on) for the time width of 500 ms in which the middle phase and the upper phase may be simultaneously reclosed.
Since it is limited to the case where the upper phase is turned on within 80 ms in the Hz system, in the case of the multi-phase reclosed state as described above, there is a high possibility that the interruption cannot be performed as described above. That is, in the conventional high-speed reclosing earthing switch, there is a high possibility that the disconnection failure may occur in the failure mode in which the multiphase reclosing state occurs.

The present invention has been proposed to solve the problems of the conventional high-speed reclosing earthing switch as described above, and an object of the present invention is to provide a high-voltage transmission line with a multiphase transmission line. To provide a high-performance high-speed reclosed earthing switch that can reliably cut off the induced current even if a zero miss phenomenon occurs in the induced current when a multi-phase reclosed state is forced due to a fault accident. That is.

[0019]

A high-speed reclosing grounding switch according to the present invention comprises a fixed contact portion provided on a main circuit conductor in a hermetically sealed container containing an arc extinguishing gas, and the fixed contact portion. In a high-speed reclosed earthing switch equipped with a puffer-shaped arc-extinguishing chamber having a movable contactor portion that comes into contact with and separates from the movable contactor portion, and a grounding terminal portion electrically connected to the movable contactor portion,
A resistor of 0.1 to 1.5Ω is electrically inserted in series between the energizing path of the puffer type arc extinguishing chamber and the ground potential.

Specifically, the puffer-type arc-extinguishing chamber is expected to flow 4000 in the event of a high-voltage transmission line accident.
The blowing pressure capable of effectively interrupting the current of about A can be maintained for about 4 cycles. And
As described above, as means for maintaining the blowable pressure that can be shut off for four cycles, for example, the size of the dead volume between the puffer cylinder and the puffer piston of the puffer arc extinguishing chamber can be determined by the state of a complete circuit. Can be configured to be 15% to 50% of the total cylinder volume. Further, by improving the operating device such as adding a damper device to the normal operating mechanism, the opening speed of the puffer arc extinguishing chamber can be reduced in the latter half of the opening operation.

[0021]

The operation of the present invention constructed as described above is as follows. That is, when the reclosing operation is performed in the operation sequence as shown in FIG. 10, as shown in the current waveform diagram of FIG.
A ground fault occurred in one of the phases (upper phase in this example), forced a multi-phase reclosed state, and at the same time as the middle phase followed by the upper phase high speed reclosed earthing switch, Even when a zero-miss current flows through the medium-phase high-speed reclosing grounding switch, in the present invention, a resistor of 0.1 to 1.5Ω is provided between the current path of the puffer arc extinguishing chamber and the ground potential. Since it is inserted, the DC component of the zero-miss current is rapidly attenuated, and the current zero point of the middle-phase current returns within 4 cycles regardless of whether or not the upper phase is restarted. Therefore, in the present invention, it is sufficient to ensure an arc time width of about 4 cycles that can be interrupted. With this time width, the improvement of the puffer arc extinguishing chamber shape and the operation device as described above, etc. Can be secured sufficiently.

In the present invention, the reason why the upper limit of the resistance value of the resistor is set to 1.5Ω is as follows. An electromagnetic induction current of about 4000 A is assumed as a duty of breaking the high-speed reclosing grounding switch. Therefore, when the fault current is cut off by the high-speed reclosing grounding switch of the present invention, a voltage drop due to the resistor is generated on the transmission line side.
By the way, the maximum purpose of arranging the high-speed reclosing grounding switch is to reliably ground the power transmission line separated by the circuit breaker and to quickly and spontaneously extinguish the arc in the accident phase arc horn. . Then, in order to extinguish the arc naturally, it is necessary to reduce the ground voltage of the transmission line to the arc voltage or less. Where UH
It has been reported that the air arc voltage during flashover between arc horns in the V transmission line is about 6 kV in actual measurement. However, if the resistance value of the high-speed re-closure earthing switch becomes 2Ω or more, the generated terminal voltage due to the current flowing through this resistance element will be applied to the power transmission line as it is, and the spontaneous arc extinction of the previous arc will occur. Becomes extremely difficult. Therefore, in the present invention, the upper limit of the resistance value of the resistor is set to 1.5Ω in consideration of the safety factor from the viewpoint of ensuring the natural extinction of the arc.

Therefore, according to the present invention, even if the zero-miss phenomenon occurs in the induced current when the polyphase reclosing is forced, the duration of the zero-miss current can be suppressed within 4 cycles. When the current zero point of the induced current is restored, this induced current can be cut off without fail.

[0024]

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

(1) First Embodiment FIG. 1 to FIG. 3 The first embodiment basically has a configuration as shown in FIGS. Here, FIG. 1 is a configuration diagram showing an outline of the configuration of the high-speed reclosing grounding switch, and FIG. 2 is a single line connection diagram showing a state in which the high-speed reclosing grounding switch of FIG. 1 is connected to a transmission line. is there. 3 is a configuration diagram showing a detailed structure of the puffer-type arc-extinguishing chamber of the high-speed reclosing grounding switch shown in FIG. 1 and a state at the end of the contact opening operation.

First, as shown in FIGS. 1 and 2, the high-speed reclosing earthing switch of the present embodiment is a puffer-type extinguishing arc provided in an earthing tank 1 in which arc-extinguishing gas is sealed at high pressure. The chamber 2 and the resistor 9 connected to the puffer arc-extinguishing chamber 2 are provided. And the puffer type arc extinguishing chamber 2
The side part is configured as follows. That is, FIG.
As shown in FIG. 3, the puffer arc extinguishing chamber 2 and the main circuit conductor 3 are housed inside the grounded tank 1. Reference numeral 4 denotes an operation mechanism for driving the movable part of the puffer arc extinguishing chamber 2 to open and close, and 5 is provided between the movable part of the puffer arc extinguishing chamber 2 and the operation mechanism 4 to convert the opening length. This is the link section. 6
Insulating spacers a and 6b fix the main circuit conductor 3 in the ground tank 1. Reference numeral 7 is a ground terminal connected between the ground tank 1 and the puffer arc-extinguishing chamber 2. When the ground switch is closed, the ground terminal 7 is connected to the ground terminal 7 through the puffer-arc extinguishing chamber 2. The main circuit conductor 3 is connected and grounded.

Further, details of the puffer type arc extinguishing chamber 2 itself are constructed as shown in FIG. That is, FIG.
In the figure, 10 is a fixed contact portion, which is composed of a fixed contact 11 directly connected to the main circuit conductor 3 and a shield 12 arranged around the fixed contact 11. Reference numeral 13 denotes a movable contactor portion, which is a movable rod attached to the inside and outside of the cylindrical operation rod 14 connected to the operation mechanism 4, the puffer cylinder 15 attached to the periphery thereof, and the tip end portion of the puffer cylinder 15. Shield 19 attached to the outer periphery of the contactor 16, the insulating nozzle 17, and the puffer cylinder 15.
Is provided with a movable part having an integral structure. A puffer piston 18, which is a fixed portion supported at a fixed position with respect to the ground tank 1, is inserted into the puffer cylinder 15 of the movable portion, and is configured to move relatively to the movable portion. . In this puffer type arc extinguishing chamber 2, a complete circuit state is provided between the puffer cylinder 15 and the puffer piston 18 in order to increase the time width (interruptible arc time width) for maintaining the blowing pressure at which interruption is possible. Therefore, the dead volume V ₁ is set so as to be 15% to 50% of the total volume of the cylinder.

Next, the resistor 9 will be described. In this embodiment, the resistor 9 is connected between the ground wire 8 connected to the ground terminal 7 of the ground tank 1 and the ground, as shown in FIG. That is, the resistor 9 is housed in the container 9a, and is connected to the ground wire 8 at one end through the terminal 9b attached to the container 9a, and is connected to the ground at the other end. . Since a voltage of only about 6 kV is applied to the resistor 9 at the maximum, the resistor 9 is installed in an air-insulated state.

The operation of this embodiment having the above construction is as follows. That is, when the reclosing operation is performed in the operation sequence as shown in FIG.
As shown in the current waveform diagram in Figure 3, a ground fault occurs in one of the two phases (the upper phase in this example) other than the middle phase, which is the phase in which the ground fault occurs, and the multiphase reclosed state is forced. , Even if a zero-miss current flows in the high-speed reclosed earthing switch of the middle phase at the same time that the high-speed reclosing earthing switch of the upper phase is closed after the middle phase, Has a resistor 9 of 0.1 to 1.5Ω inserted between the energization path of the puffer arc extinguishing chamber 2 and the ground, the DC component of the zero-miss current is rapidly attenuated. Regardless of whether or not the phase is restarted, the current zero of the medium phase current returns within 4 cycles.

Therefore, it is enough to secure an arc time width of about 4 cycles that can be interrupted. This time width is large provided between the puffer cylinder 15 and the puffer piston 18 of the puffer type arc extinguishing chamber 2. It can be easily achieved by the dead volume V ₁ . That is,
As is clear from a comparison between the present embodiment of FIG. 3 and the conventional example of FIG. 14, the dead volume is greatly increased in the present embodiment as compared with the conventional example shown in FIG. Therefore, the time during which the blowing pressure capable of breaking can be maintained can be increased by that amount, and the breaking arc time width of about 4 cycles can be easily secured. This point has already been described in the section of the prior art as the description of the characteristic diagram of FIG.

Therefore, according to this embodiment, even if a zero-miss phenomenon occurs in the induced current when the polyphase reclosed state is forced, the duration of the zero-miss current can be suppressed within 4 cycles. As a result, the induced current can be reliably cut off when the current zero point of the induced current is restored.

As described above, in this embodiment, the direct current component of the induced current is controlled by the resistor 9 of 0.1 to 1.5Ω inserted between the current-carrying path of the puffer type arc extinguishing chamber 2 and the ground. Can be quickly attenuated, so that the current zero point of the induced current is restored during about 4 cycles in which the blowing pressure of the puffer arc extinguishing chamber 2 maintains the interruptable pressure. Therefore, according to the present embodiment, it is possible to reliably cut off all induced currents having a cutoff range of any size that can be assumed in a high voltage transmission line of 1100 kV class,
It is possible to provide a high-speed reclosing grounding switch suitable for high-voltage power transmission. Further, in the present embodiment, since the resistor 9 is installed in the air-insulated state, there is an advantage in maintenance that the maintenance and inspection can be easily performed.

(2) Second Embodiment ... FIG. 5 The second embodiment basically has a configuration as shown in FIG. Here, FIG. 5 is a configuration diagram showing an outline of the configuration of the high-speed reclosing grounding switch. That is, in addition to the improvement of the puffer type arc extinguishing chamber shape shown in the first embodiment, the high speed reclosing earthing switch of the present embodiment, as shown in FIG. The operating device is improved. That is, as shown in FIG. 5, in the present embodiment, a damper device 21 is added to the operation mechanism 4 that is normally used, and the damper device 21 is connected to the link portion 5 via the main shaft 20. . During the opening operation, the damper device 21 is operated in the latter half of the opening operation to reduce the opening speed of the movable contact portion 13 of the puffer arc extinguishing chamber 2 in the latter half of the stroke. It is a thing. The structure other than this part is the same as that of the first embodiment.

In the present embodiment having the above-mentioned structure, as in the first embodiment, 0.1 to 1.5Ω inserted between the current-carrying path of the puffer arc extinguishing chamber 2 and the ground. Since the direct current component of the induced current can be rapidly attenuated by the resistor 9 of, the current zero point of the induced current is about 4 cycles in which the blowing pressure of the puffer type arc extinguishing chamber 2 maintains the interruptable pressure. Return in the meantime. Therefore, also in this embodiment, as in the first embodiment, 1100
A high-speed reclosed earthing switch suitable for high-voltage power transmission can be provided because it can reliably block all induced currents having a blocking range of any magnitude that can be assumed in a kV-class high-voltage power transmission line. Also in this embodiment, the first
As in the case of the embodiment, since the resistor 9 is installed in the air-insulated state, there is an advantage in maintenance that the maintenance and inspection can be easily performed.

In the present embodiment, as in the first embodiment, the dead volume of the puffer type arc-extinguishing chamber 2 is greatly increased as compared with the conventional example shown in FIG. In addition to being able to increase the possible arc time width, in particular, the damper device 21 is configured to reduce the opening speed in the latter half of the opening operation. It is possible to secure the arc time width that can be interrupted. Therefore, it is possible to allow a margin in terms of design and device performance as compared with the first embodiment. Note that the increase in the breakable arc time width due to the deceleration of the opening speed as described above has already been described in the section of the prior art as the description of the characteristic diagram of FIG.

(3) Third Embodiment ... FIG. 7 The third embodiment basically has a configuration as shown in FIG. Here, FIG. 7 is a configuration diagram showing an outline of a configuration of the high-speed reclosing grounding switch. That is, in the high-speed reclosing earthing switch of this embodiment, the resistor 9 provided outside the earthing tank 1 in the first embodiment is installed around the puffer arc extinguishing chamber 2 in the earthing tank 1. , One end of which is connected to the movable contact portion 13 of the puffer arc extinguishing chamber 2 and the other end of which is connected to the ground terminal 7, and the ground terminal 7 is grounded via the ground wire 8. It is connected. Regarding the configuration other than this part, the first
This is exactly the same as the embodiment.

In the present embodiment having the above-mentioned configuration, the resistor 9 is different from the first embodiment only in the geometrical installation location, but electrically, like the above-mentioned embodiment,
It is inserted between the current-carrying path of the puffer type arc extinguishing chamber 2 and the ground. That is, also in this embodiment, as in the first and second embodiments, the direct current component of the induced current can be rapidly attenuated by the resistor 9 of 0.1 to 1.5Ω, so that the induction The current zero point of the current returns during about 4 cycles in which the spraying pressure of the puffer arc extinguishing chamber 2 maintains the interruptable pressure. Therefore, also in the present embodiment, as in the first and second embodiments, 1100 kV
A high-speed reclosing grounding switch suitable for high-voltage power transmission can be provided because it can surely block all induced currents having a blocking range of any size that can be assumed in a high-voltage power transmission line of a class.

In the present embodiment, in particular, since the resistor 9 is installed in the high pressure gas in the ground tank 1, effective cooling of the resistor 9 can be expected due to the high cooling characteristic of the high pressure gas. Therefore, the energy duty of the resistor 9 is extremely advantageous, and for example, the size of the resistor 9 for the same energy duty can be reduced, which has an advantage of contributing to downsizing of the grounding switch as a whole.

(4) Fourth Embodiment ... FIG. 8 The fourth embodiment basically has a configuration as shown in FIG. Here, FIG. 8 is a configuration diagram showing an outline of a configuration of the high-speed reclosing grounding switch. That is, in the high-speed reclosing grounding switch of this embodiment, as shown in FIG. 8, the resistor 9 is installed around the puffer arc-extinguishing chamber 2 in the grounding tank 1 as in the case of the third embodiment. And the second
Similar to the second embodiment, a damper device 21 is added on the operating side as in the second embodiment. That is,
As shown in FIG. 8, in the present embodiment, similarly to the second embodiment, a damper device 21 is added to the operation mechanism 4 that is normally used, and the damper device 21 is linked via the main shaft 20. It is connected to the part 5. During the opening operation, the damper device 21 is operated in the latter half of the opening operation to reduce the opening speed of the movable contact portion 13 of the puffer arc extinguishing chamber 2 in the latter half of the stroke. ing. The structure other than this part is the same as that of the third embodiment.

Also in this embodiment having the above-mentioned structure, as in the case of the first to third embodiments, 0.1 to 10 inserted between the current-carrying path of the puffer arc extinguishing chamber 2 and the ground.
Since the direct current component of the induced current can be quickly attenuated by the 1.5Ω resistor 9, the current zero point of the induced current maintains the pressure at which the blowing pressure of the puffer arc extinguishing chamber 2 can be shut off. Return in about a cycle. Therefore, also in the present embodiment, similarly to the first to third embodiments, it is possible to surely cut off all the induced currents having the cutoff range of any size that can be assumed in the high voltage transmission line of 1100 kV class. It is possible to provide a high-speed reclosing grounding switch suitable for high-voltage power transmission.

In the present embodiment, as in the third embodiment, the resistor 9 is added to the high pressure gas in the ground tank 1.
Is installed, effective cooling of the resistor 9 can be expected due to the high cooling characteristics of the high-pressure gas. Therefore, similarly to the third embodiment, the energy duty of the resistor 9 is extremely advantageous, and for example, the size of the resistor 9 for the same energy duty can be reduced, which contributes to downsizing of the grounding switch as a whole. There are advantages.

Further, in the present embodiment, as in the second embodiment, the damper device 21 is configured to reduce the opening speed in the latter half of the opening operation, so that the third embodiment is described. It is possible to secure a larger arc time width that can be interrupted. Therefore, it is possible to allow a margin in terms of design and device performance as compared with the third embodiment.

(5) Other Embodiments The present invention is not limited to the above embodiments, but the detailed construction of the puffer arc-extinguishing chamber, the installation location of the resistor and the detailed construction thereof, and The connection configuration between the puffer arc extinguishing chamber and the resistor can be selected as appropriate. Further, in the present invention, means for securing the arc time width that can be interrupted can be appropriately selected, and as in each of the embodiments, the selection of the size of the dead volume of the puffer type arc extinguishing chamber and the operation device. In addition to the deceleration structure and the like, appropriate means can be selectively used in combination or used alone as long as the blowable pressure that can be shut off can be maintained for about 4 cycles.

[0044]

As described above, according to the present invention,
0.1 between the current path of the puffer-type arc-extinguishing chamber and the ground potential
By inserting a resistor of ~ 1.5Ω electrically in series, induced current is generated when a ground fault occurs in a multi-phase transmission line in a high-voltage transmission line and a polyphase reclosed state is forced. It is possible to provide a high-performance high-speed reclosed earthing switch capable of reliably interrupting this induced current even when the zero-miss phenomenon occurs in the device.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of a first embodiment of a high-speed reclosing grounding switch according to the present invention.

FIG. 2 is a single wire connection diagram showing a state in which the high-speed reclosing grounding switch of FIG. 1 is connected to a power transmission line.

3 is a configuration diagram showing a detailed structure of a puffer-type arc-extinguishing chamber of the high-speed reclosing grounding switch shown in FIG. 1 and a state at the end of the contact opening operation.

FIG. 4 is a characteristic diagram showing a stroke characteristic (opening movement characteristic) and a pressure increase characteristic in a puffer cylinder during a contact opening operation of the high-speed re-closed circuit grounding switch of FIG. 1;

FIG. 5 is a configuration diagram showing a schematic configuration of a second embodiment of a high-speed reclosing grounding switch according to the present invention.

FIG. 6 is a characteristic diagram showing a stroke characteristic (opening movement characteristic) and a pressure increase characteristic in the puffer cylinder during the opening operation of the high-speed re-closed circuit grounding switch of FIG. 5;

FIG. 7 is a configuration diagram showing a schematic configuration of a third embodiment of a high-speed reclosing grounding switch according to the present invention.

FIG. 8 is a configuration diagram showing a schematic configuration of a fourth embodiment of a high-speed reclosing grounding switch according to the present invention.

FIG. 9 is a conceptual diagram showing a system for extinguishing a reverse flashover arc of a series of insulators in a high-voltage transmission system by using a high-speed reclosing grounding switch.

10 is an operation sequence diagram showing an operation sequence of the system components of FIG.

FIG. 11 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 reclosing grounding switch.

FIG. 12 is a voltage waveform diagram showing a transient recovery voltage when the high-speed reclosing grounding switch is opened.

FIG. 13 is a configuration diagram showing an outline of a configuration of an example of a conventional high-speed reclosing grounding switch.

14 is a configuration diagram showing a detailed structure of a puffer-type arc-extinguishing chamber of the high-speed re-closed circuit grounding switch shown in FIG. 13 and a state at the end of the contact opening operation.

15 is a characteristic diagram showing a stroke characteristic (opening movement characteristic) and a pressure increase characteristic in a puffer cylinder during the opening operation of the high-speed reclosing grounding switch of FIG.

FIG. 16 is a current waveform diagram showing a state in which a zero-miss current is generated in the high-voltage power transmission line.

FIG. 17 is a configuration diagram showing an outline of a configuration of another example of a conventional high-speed reclosing grounding switch.

FIG. 18 is a current waveform diagram showing a circulating current flowing through the high-speed re-closed earthing switch of each phase when the upper-phase high-speed re-closing earthing switch is closed in the middle phase closed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Grounding tank 2 ... Puffer type arc-extinguishing chamber 3 ... Main circuit conductor 4 ... Operating mechanism 5 ... Link part 6a, 6b ... Insulating spacer 7 ... Grounding terminal 8 ... Grounding wire 9 ... Resistor 9a ... Container 9b ... Terminal 10 ... Fixed contact part 11 ... Fixed contact part 12, 19 ... Shield 13 ... Movable contact part 14 ... Operation rod 15 ... Puffer cylinder 16 ... Movable contact part 17 ... Insulation nozzle 18 ... Puffer piston 20 ... Main shaft 21 ... Damper device

Front Page Continuation (72) Inventor Ikuo Miwa 2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock Company Toshiba Hamakawasaki Factory

Claims (1)

[Claims] 1. A fixed contact portion provided on a main circuit conductor in an airtight container in which an arc extinguishing gas is sealed, a movable contact portion contacting and separated from the fixed contact portion, and the movable contact portion. A high-speed reclosed earthing switch equipped with a puffer-type arc-extinguishing chamber having a grounding terminal portion electrically connected to the closed container, wherein a zero-value is provided between a current path of the puffer-type arc-extinguishing chamber and a ground potential. A high-speed reclosed grounding switch characterized in that a resistor of 1 to 1.5Ω is electrically inserted in series.