JPH06150789A - High speed re-closing earth switch device - Google Patents

Abstract

PURPOSE:To break certainly the induction current which does not form any current zero point by protruding an arc electrode from a stationary contacting piece which is in direct coupling with a main circuit conductor, and sending a gas in a puffer chamber blowing to the tip of a movable contacting piece. CONSTITUTION:When pole opening proceeds, an arc 20 moves toward an arc electrode 21 positioned nearer geometrically than a stationary contacting piece 13, and part of the current flows to the arc electrode 21. Arcs 24 are generated between it 21 and a movable contacting piece 17, and finally all current substantially transfers to the arc electrode 21. The current path follows from a conductor 8, to a resistor 22, the arc electrode 21, arcs 24, the movable contacting piece 17, and a grounding terminal part. Thus generates the condition that the resistor 22 is automatically inserted in a breaking current circuit serially. The gas compressed in a puffer chamber 25 is passed through an exhaust hole 26 and released from the tip of the movable contacting piece 17 to blow to the arcs 24. As the separating distance of the two contacting pieces 13, 17 has become sufficiently large, the arcs 24 go out certainly and the breaking is completed.

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. 4 to 10. First, as shown in FIG. 4, 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. 4, 1 is a bushing at the entrance of the switchgear of the substation, 2 is a transmission line, 3 is a steel tower, 4 is a thundercloud, 5 is a lightning discharge arc, 3a is an arc horn, and 3a is an arc horn.
Reference numeral b is a series of insulators and reference numeral 3c is a reverse flash arc generated in the arc horn 3a. Further, FIG. 5 is an operation sequence diagram showing an operation order of the system components of FIG.

Here, in FIG. 4, in the UHV system tower group, the arc horn 3a of the middle phase of the transmission line due to a lightning strike or the like.
When a reverse flashover arc 3a occurs in the
It is assumed that the reclosing operation by B) and the high speed reclosing earthing switch (HSES) is performed according to the sequence diagram shown in FIG. In this case, the faulty line receives electromagnetic induction from the sound phase of the same line and from other lines connected in parallel, so the high-speed reclosed earthing switch (HSE) installed at the substations at both ends of the transmission line.
After closing S), high-speed re-closed earthing switch (HSES)
An electromagnetic induction current flows as shown in FIG. In order to cut off this current with the high-speed reclosed earthing switch (HSES), by opening the high-speed reclosing earthing switch (HSES),
When the faulty power transmission line is released from the grounded state, as shown in FIG. 7, between the contacts of the high-speed re-closing earthing switch (HSES), the transient phenomenon of the electric circuit and the static electricity received by the faulty power transmission line from other lines are received. A transient recovery voltage on which the induced voltage is superimposed is applied. As shown in FIG. 6 and FIG. 7, 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. 8 is a block diagram showing the outline of the configuration of an example of a high-speed reclosing grounding switch equipped with a conventional puffer type arc extinguishing chamber. In FIG. 8, reference numeral 6 denotes a grounding container, in which a puffer arc-extinguishing chamber 7 and a conductor 8 are housed. Reference numeral 9 denotes an operating device for driving the movable part of the puffer arc extinguishing chamber 7 to open and close, and 10 is provided between the movable part of the puffer arc extinguishing chamber 7 and the operating device 9 to convert the opening contact length. This is the link section. 11a and 11b are insulating spacers,
The conductor 8 is fixed in the ground container 6. Reference numeral 12 is a ground terminal portion connected between the ground container 6 and the puffer arc-extinguishing chamber 7, and the puffer arc-extinguishing chamber 7 is connected to the ground terminal portion 12 when the ground switch is closed. The conductor 8 is connected to the ground via the conductor 8 and is grounded.

FIG. 9 is a structural diagram showing a detailed structure of the puffer type arc extinguishing chamber of FIG. 8 and a state at the end of the contact opening operation. Here, A is a fixed contactor portion, which is a fixed contactor 13 directly connected to the conductor 8 and a shield 14 disposed around the fixed contactor 13.
It is composed of a. Further, B is a movable contact portion, which is a cylindrical operation rod 1 connected to the operation device 9.
5 and a puffer cylinder 1 attached to the periphery thereof
6, the movable contactor 17 mounted on the inside and outside of the tip of the puffer cylinder 16, the insulating nozzle 18, and the shield 14b mounted on the outer periphery of the puffer cylinder 16 have an integral structure. Then, a puffer piston 19 which is a fixed portion supported at a fixed position with respect to the ground container 6 is inserted into the puffer cylinder 16 of the movable portion, and is configured to move relatively to the movable portion. .

In FIG. 9, 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 is generated in the nozzle portion, and the fixed contact 1
The arc generated between 3 and the movable contact 17 is extinguished. After the contact opening operation is completed, the insulation between the fixed contact portion A and the movable contact portion B is secured by the effect of the shields 14a and 14b.

FIG. 10 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 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. 6 and 7 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 an excellent shut-off performance, so that the 2000
It is relatively easy to extinguish the electromagnetic induction current of the level of A to 3000 A, and as shown in FIG. 10, it can be extinguished with a relatively low pressure increase Δp _1a and Δp _1b .

However, not only a large electromagnetic induction current but also a high transient recovery voltage as shown in FIG. 7 is applied to this grounding switch, so that the breaking is successful unless the opening distance is sufficiently large. do not do. That is, in FIG. 10, 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. 10, the time from the opening position x ₀ up to the position x ₂ which is separable distance L ₂ is obtained, the shortest arcing time Ta _min capable of blocking, pressure opening end from the opening position x ₀ The time until the rise value Δp _1b is obtained is the maximum arc time Ta _max . And this shortest arc time T
The time difference between a _min and the longest arc time Ta _max becomes the arc time width Tw that can be interrupted. It is sufficient that the breakable arc time width Tw is equal to or longer than the half-wave time of the breaking 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.

[0010]

By the way, when the reclosing operation is carried out in the sequence shown in FIG.
As shown in the current waveform diagram of FIG. 11, a ground fault accident (follow-up failure) occurs with a time difference in one of the two phases (upper phase in this example) other than the middle phase which is the ground fault accident occurrence phase, If the timing of this follow-up failure overlaps with the opening timing of the high-speed re-closed earthing switch, and if the follow-up failure accident current contains many DC components, the current passing through the high-speed re-closed earthing switch due to 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 (breakable arc) at which the breakable blowing pressure of the conventional high-speed reclosing grounding switch as shown in FIG. 10 is maintained. The 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 is not formed again within the breakable arc time width Tw. Therefore, such a current cannot be interrupted by the conventional high speed reclosing grounding switch.

The present invention has been proposed in order to solve the problem of the conventional high-speed reclosed earthing switch as described above, and an object thereof is to set a current zero point for several cycles in a high-voltage transmission line. It is an object of the present invention to provide a high-performance high-speed reclosing grounding switch that can reliably cut off an induced current that does not form.

[0012]

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,
It has the following features.

That is, the fixed contact portion is provided with a fixed contact directly connected to the main circuit conductor, and an arc arranged so as to surround the fixed contact and the tip of the fixed contact protrudes beyond the fixed contact. An electrode, a resistor electrically connecting the main circuit conductor and the arc electrode, and the movable contactor portion includes a movable contactor that contacts and separates from the fixed contactor, and an outer periphery of the movable contactor. It is characterized in that it has a puffer chamber formed by a puffer cylinder and a puffer piston for covering, and a gas flow passage for blowing the gas in the puffer chamber to the tip of the movable contact. In this case, the gas flow path is generally configured to connect the puffer chamber and the movable contact.

[0014]

The operation of the present invention constructed as described above is as follows. That is, first, when the opening operation of the puffer type arc extinguishing chamber is started, an arc is generated between the fixed contact and the movable contact. In this case, since the fixed contact is directly connected to the main circuit conductor, the resistor is not inserted in the breaking circuit in the initial opening operation. Then, in the latter half of the opening operation, when the tip of the movable contact is sufficiently separated from the fixed contact, the arc moves to the arc electrode arranged so as to project from the fixed contact. This arc electrode is
Since it is connected to the main circuit conductor via the resistor, the resistor is inserted into the breaking circuit when the arc moves to the arc electrode. As a result, the DC component of the breaking current can be quickly attenuated by the resistor. As described above, in the present invention, the resistor can be inserted in series with the breaking circuit only at the moment of breaking the current, and the DC component of the breaking current can be quickly attenuated.

Therefore, a ground fault occurs in one phase of the transmission line, the circuit breaker opens, and then a high-speed reclosing ground switch is turned on to extinguish the reverse flashover (reverse flashover). After that, in the adjacent other phase or in the other line that was put together, a follow-up failure accident that overlaps with the opening timing of the high-speed re-closed grounding switch in the ground fault phase occurs, and the DC current component is added to this post-failure failure current. Is included in the high-speed reclosed earthing switch in the ground fault accident phase, even if a zero-miss current that does not form a current zero point flows for several cycles, this DC component is attenuated promptly and the high-speed reclosing earthing switch opens and closes. Since the current zero point can be formed again within the time width (interruptible arc time width) in which the breakable spray pressure of the vessel is maintained, the current in the ground fault phase can be reliably interrupted.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the high speed reclosing grounding switch according to the present invention will be specifically described below with reference to FIGS. First, FIG. 1 is a configuration diagram showing an outline of a configuration of a high-speed reclosing grounding switch. In FIG. 1, 6
Is a grounding container, in which the puffer arc-extinguishing chamber 7 and the conductor 8 are housed. Reference numeral 9 is an operating device for opening and closing the movable part of the puffer arc extinguishing chamber 7, and 10 is provided between the movable part of the puffer arc extinguishing chamber 7 and the operating device 9.
It is a link part for converting the opening length. Insulating spacers 11a and 11b fix the conductor 8 in the ground container 6. Reference numeral 12 is a ground terminal portion connected between the ground container 6 and the puffer arc-extinguishing chamber 7, and the puffer arc-extinguishing chamber 7 is connected to the ground terminal portion 12 when the ground switch is closed. The conductor 8 is connected to the ground via the conductor 8 and is grounded. The above configuration is the same as that of the conventional example of FIG. 8 described above, but in this example, the configuration of the puffer arc extinguishing chamber 7 has the following features.

FIG. 2 is a structural diagram showing the detailed structure of the puffer type arc-extinguishing chamber 7 and the state in which the electrodes are open. Here, A is a fixed contactor portion, and the fixed contactor 13, the shield 14a,
It is composed of an arc electrode 21 and a resistor 22. That is, the fixed contactor 13 is directly connected to the conductor 8, and the arc electrode 21 is arranged so as to surround the fixed contactor 13 and project its tip from the fixed contactor 13. The resistor 22 is arranged so as to electrically connect the arc electrode 21 and the conductor 8.

Reference numeral B denotes a movable contactor, which is attached to the inside and outside of the cylindrical operation rod 15 connected to the operation device 9, the puffer cylinder 16 attached to the periphery thereof, and the tip end of the puffer cylinder 16. Movable contactor 1
7 and the shield 14b, and a shield 14c attached to the outer periphery of the puffer cylinder 16 has a movable portion having an integral structure. Then, a puffer piston 19 which is a fixed portion supported at a fixed position with respect to the ground container 6 is inserted into the puffer cylinder 16 of the movable portion, and is configured to move relatively to the movable portion. .

Further, in FIG. 2, 20 and 24 are arcs in the initial opening operation and the latter half of the opening operation, and 23 is the position of the movable contactor 17 in the closed state. Further, reference numeral 25 denotes a puffer chamber formed by the puffer cylinder 16 and the puffer piston 19, and the puffer chamber 25 is provided inside the movable contactor 17 through an exhaust hole 26 provided at the tip of the operating rod 15. A gas flow path is formed from the puffer chamber 25 to the tip of the movable contact 17 through the inside of the movable contact 17.

The operation of this embodiment having the above construction is as follows. That is, in the closed state, the movable contact 17 has the fixed contact 1 as shown by 23.
It is inserted in the inside of the 3 and both are in the electrical connection state. In this case, the energization current reaches the ground terminal portion 12 shown in FIG. 1 from the conductor 8 via the fixed contact 13 and the movable contact 17. Then, from such a closed state, it is assumed that the high-speed re-closed grounding switch is opened when the current is cut off, and the movable contactor 17 reaches from the closed state 23 to the position indicated by the solid line in the figure. . That is, from the moment the movable contact 17 comes out of the fixed contact 13, the arc 20 starts to ignite between the two contacts 13 and 17, and as the distance between the two contacts 13 and 17 increases, the arc 20 increases. The length of. The energization path at this time is the same as the energization path in the above-mentioned closed state except that the arc 20 exists between the fixed contact 13 and the movable contact 17.

However, when the contact is further opened, the arc 20 moves to the side of the arc electrode 21 that is geometrically closer to the fixed contact 13, so that part of the current flows to the arc electrode 21. Then, an arc 24 is generated between the arc electrode 21 and the movable contact 17, and finally almost all the current is commutated to the arc electrode 21. In this case, the current path is from the conductor 8 to the resistor 22, and further to the movable contactor 17 from the movable electrode 17 through the arc electrode 21 and the arc 24.
The ground terminal portion 12 shown in FIG. Therefore, at this point, the resistor 22 is automatically inserted in series in the breaking current circuit. FIG. 3 is a graph showing the relationship between the resistance value of the resistor thus inserted in the breaking current circuit and the time until the zero point of the breaking current returns. This Figure 3
Therefore, by appropriately selecting the resistance value, the DC current component contained in the breaking current can be quickly attenuated.Therefore, the current zero point can be maintained while the breaking pressure by the puffer arc extinguishing chamber is maintained. You can see that you can return to.

Then, the gas compressed in the puffer chamber 25 is blown from the tip of the movable contact 17 to the arc 24 through the exhaust hole 26 from the puffer chamber 25 as shown by the arrow in the figure. At this time, the separation distance between the contacts 13 and 17 is also large enough to be able to be blocked. Therefore, the arc 24 is surely extinguished, and the interruption is completed.

As described above, in the present embodiment, the resistor 22 is inserted in series in this breaking circuit only at the moment of breaking the current, and the DC component of the breaking current can be quickly attenuated. Therefore, after a ground fault occurs in one phase of the power transmission line, the circuit breaker opens, and then the high-speed reclosing ground switch is turned on to extinguish the reverse flashover (reverse flashover). In the adjacent other phase or in the other line connected together, a follow-up failure accident that overlaps with the opening timing of the high speed re-closed earthing switch in the ground fault accident phase occurs, and this follow-up failure accident current contains many DC current components. Therefore, even if a zero-miss current that does not form a current zero is applied to the high-speed reclosed earthing switch in the ground fault phase for several cycles, this DC component is attenuated quickly enough to shut off the high-speed reclosing earthing switch. Since the current zero point can be formed again within the time width in which the possible spray pressure is maintained (interruptible arc time width), the induced current in the ground fault phase can be reliably interrupted.

In summary, in the present embodiment, the DC component of the breaking current can be quickly attenuated, and the current zero point of the breaking current is the blowing pressure capable of breaking the puffer arc-extinguishing chamber. Since the restoration is made within the maintained time width, the induced current in the ground fault phase can be cut off without fail. Therefore, it is possible to surely achieve the interruption of the severe conditions of the relatively large current, the relatively large rate of increase, and the transient recovery voltage of the high peak value, so that the UHV system transmission of the 1100 kV class, which is expected to be put to practical use in the future, can be achieved. Suitable for electric wire,
It is possible to provide a high-performance high-speed reclosing grounding switch.

The present invention is not limited to the above-mentioned embodiment, and the specific detailed structure of the puffer type arc extinguishing chamber can be selected as appropriate. For example, a fixed contactor, an arc electrode, or a movable contactor. Specific configurations such as can be appropriately selected. Further, the specific configuration of the operation mechanism of the puffer arc extinguishing chamber can be freely selected.

[0026]

As described above, according to the present invention,
Around the fixed contact of the puffer type arc extinguishing chamber, by providing an arc electrode protruding from the fixed contact, and a resistor electrically connecting the main circuit conductor and the arc electrode,
It is possible to provide a high-performance high-speed reclosing grounding switch capable of reliably interrupting an induced current that does not form a current zero point for several cycles in a high-voltage transmission line.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram showing a detailed structure of a puffer-type arc-extinguishing chamber of the high-speed reclosing grounding switch of FIG.

FIG. 3 is a graph showing the relationship between the resistance value of a resistor inserted in the breaking current circuit in the latter half of the opening operation of the high-speed re-closing earthing switch of FIG. 1 and the time until the zero point of the breaking current returns.

FIG. 4 is a conceptual diagram showing a system for extinguishing a reverse flashover arc of an insulator series in a high-voltage transmission system by using a high-speed reclosing earthing switch.

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

FIG. 6 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. 7 is a voltage waveform diagram showing a transient recovery voltage when the high-speed reclosing grounding switch is opened.

FIG. 8 is a configuration diagram showing a schematic configuration of an example of a conventional high-speed reclosing grounding switch.

9 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. 8 and a state at the end of the contact opening operation.

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

FIG. 11 is a current waveform diagram showing a state in which a zero-miss current is generated in the high-voltage power transmission line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bushing 2 ... Power transmission line 3 ... Tower 4 ... Thundercloud 5 ... Lightning discharge arc 6 ... Grounding vessel 7 ... Puffer type arc extinguishing chamber 8 ... Conductor 9 ... Operating device 10 ... Link part 11a, 11b ... Insulation spacer 12 ... Grounding terminal Part 13 ... Fixed contactor 14a-14c ... Shield 15 ... Operation rod 16 ... Puffer cylinder 17 ... Movable contactor 18 ... Insulation nozzle 19 ... Puffer piston 20, 24 ... Arc 21 ... Arc electrode 22 ... Resistor 23 ... Position of movable contact 25 ... Puffer chamber 26 ... Exhaust hole

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hitoshi Mizoguchi 2-1, Ukishima-cho, Kawasaki-ku, Kanagawa Prefecture No. 1 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. In 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, the fixed contact portion is a fixed contact directly connected to the main circuit conductor. A child, an arc electrode that surrounds the fixed contact and is arranged so that its tip projects from the fixed contact, and a resistor that electrically connects the main circuit conductor and the arc electrode. The movable contact section includes a movable contact that comes in contact with and separates from the fixed contact, and a puffer chamber formed by a puffer cylinder and a puffer piston that covers the outer periphery of the movable contact.
A high-speed reclosing grounding switch having a gas flow path for blowing the gas in the puffer chamber to the tip of the movable contactor.