JP2003109481A - High-speed grounding switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable, small-size, and low-cost high-speed grounding switch capable of cutting off an induction current without forming current zero for several cycles in a high-voltage transmission line. SOLUTION: This high-speed grounding switch is provided with a puffer arc distinguishing chamber 7 having a puffer cylinder 16 and a puffer piston 19 forming a cylinder volume part C to be a gas compression chamber. The puffer piston 19 is provided with sub-volume parts E and F communicated with the cylinder volume part C in the rear part of its tip surface. The puffer cylinder 16 is provided at the tip part of an operation rod 15 reciprocatively disposed in the central part of the puffer arc distinguishing chamber, and the operation rod 15 penetrates the puffer piston with itself supported by a support part 19a provided in the central part of the puffer piston. The support part 19a of the operation rod provided in the puffer piston 19 is disposed in a partition wall part between the cylinder volume part C and the sub-volume part F.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to a high-voltage power transmission line.
Of the arc horn on the transmission line
After the ground fault which occurs by the line breaker
The electromagnetic induction current arc sustained in the arc horn is
The arc is extinguished by the high-speed closing operation in coordination with the opening and closing operation.
First, the induced current is interrupted by the instantaneous opening operation,
High-speed earthing switch that enables retransmission of electricity by reclosing
I do. [0002] 2. Description of the Related Art UHV transmission lines such as 1100 kV
When a phase reclosing is performed,
Because the electromagnetic induction current from other phases is large,
Even after the circuit breaker is opened, power from other phases
Due to the magnetic induction, the arc of the arc horn of the tower insulators is extinguished.
There is a problem that power transmission cannot be resumed because the power is not arced. This
Grounding when re-closing the circuit breaker
Closure of the arc horn at high speed to extinguish the arc flash reverse flashover arc
And then open immediately to allow the circuit breaker to reclose
The system was needed. [0003] The background to the need for such a system is briefly described.
Illustrated in Fig. 4 shows the power transmission where the above-mentioned problems occur.
It is a conceptual diagram of a system. 1 in the figure is a substation switchgear
Bushing at the entrance, 2 for power lines, 3 for towers, 4 for lightning strikes,
5 is a lightning discharge arc. Fig. 5 shows the system configuration.
FIG. 9 is a sequence diagram showing a primary operation order. Here, for example
For example, in a UHV tower group as shown in FIG.
Reverse flashover occurs in the middle line of the transmission line of the arc horn shown.
Assuming this was the case, after this accident occurred
(GCB) and high-speed earthing switch (HSES)
When the operation is performed according to the sequence diagram shown in FIG.
Will be described. In this case, the faulty line is sound
Power is transmitted because it receives electromagnetic induction from other lines
After closing the HSES installed at the substations at both ends of the line,
An electromagnetic induction current as shown in FIG. 6 flows through the SES.
Open HSES to cut off this current with HSES
When the faulty transmission line is released from the ground state, the HSES
As shown in Fig. 7, the transient phenomenon of the electric circuit
And the induced voltage received from the other line on the faulty transmission line is superimposed.
Applied transient recovery voltage. These FIGS. 6 and 7
A relatively large current and a relatively large rise, as shown in
Rate, the transient recovery voltage with a high peak value is SF₆Moth
Grounding with side-by-side arc-extinguishing chambers that open and close rod-shaped contacts in
Can not be shut off with switchgear, puffer type arc extinction like circuit breaker
It is necessary to have a room. FIG. 1 shows a high-speed connection provided with a puffer type arc-extinguishing chamber.
It is sectional drawing which shows the outline | summary of the general structure of a ground switch. This
In the figure, reference numeral 6 denotes a grounding container, inside which a package is provided.
A f-shaped arc extinguishing chamber 7, a conductor 8, and the like are housed. 9 is
Operation for opening and closing the movable part of the puffer type arc extinguishing chamber 7
9a in the operating device is a hydraulic system including a control valve.
The Linder 10 is a movable part of the puffer type arc extinguishing chamber 7 and an operating device.
A link section that is provided between
You. 11a and 11b are insulating spacers for connecting the conductors 8 to each other.
It is fixed in the earth container 6. 12 is a ground terminal part.
When the earthing switch is closed, the ground terminal 12 is
The conductor 8 is connected through the baffle-type arc-extinguishing chamber 7,
Therefore, the conductor 8 is grounded. Such a main configuration is
Same as the gas-type circuit breaker, except that the above
Low cylinder pressure because it is much lighter than a breaker
Can be shut off by ascending. By the way, in the sequence shown in FIG.
While performing the road operation, the current change diagram shown in FIG.
Thus, one of the two phases other than the middle phase,
Phase fault (follow-up)
Failure) occurs, and the timing of the follow-up failure is
If the timing coincides with the opening timing of the switch, electromagnetic induction
The current passing through the high-speed earthing switch is as shown in part A of FIG.
Then, the waveform has no current zero point for several cycles.
Normally, the interruption of the AC current at the switch is not the current zero point.
Is not achieved, the fault current of the other phase is eliminated and the current becomes zero.
The current is not interrupted until a point is formed. Several cycles
If a current zero is later formed, such a current is blocked.
As a technique for disconnecting, for example, as shown in FIG.
A grounding switch with a baffle-type arc-extinguishing chamber has been proposed
(Japanese Patent Application No. 4-285901). Below, this conventional
The grounding switch will be described. FIG. 9 shows the opening operation of the earthing switch.
The state at the time of termination is shown. In this figure, A is fixed
This is a contact portion, and is in contact with a fixed contact 13 disposed inside and outside.
The conductor 8 (see FIG.
Fixed to 1). B is a movable contact portion.
And a cylindrical operation connected to the operation device 9 (FIG. 1) described above.
Puffer cylinder mounted on the outer periphery of the rod 15
16 and inside and outside the tip of the puffer cylinder 16.
From the attached movable contact 17 and the insulating nozzle 18
It is configured. The puffer cylinder 16 contains
A buffer piston 19 is inserted.
Due to the tip surface of the stone 19, the inside of the puffer cylinder 16
Is formed with a cylinder volume portion C which becomes a gas compression chamber.
You. Further, a shield is provided outside the puffer cylinder 16.
14b is arranged. And these puffer pie
The stone 19 and the shield 14b are the grounding container described above.
6 (FIG. 1) fixed via an insulating member or the like.
The movable contact part B is configured to be movable with respect to this fixed part.
Have been. [0007] FIG.
The earth switch operates as follows. That is, during opening operation
The gas in the puffer cylinder 16 is compressed,
Gas flow in two directions as shown by the dotted arrow in the figure
This gas flow causes the stationary contact 13 and the movable contact
The arc generated between 17 is extinguished. After the opening
Are fixed contacts due to the effect of the shields 14a and 14b.
Insulation between the portion A and the movable contact portion B is ensured. In addition,
The dotted line in FIG. 9 indicates the movable contact 17 and the insulation in the closed state.
The positions of the nozzle 18 and the like are shown. More specifically, the ground switch shown in FIG.
The baffle-type arc extinguishing chamber is sealed at the end of opening as shown in FIG.
And the puffer piston 19
Length L of cylinder volume C formed in cylinder 16_O
However, the volume when the cylinder volume C is cut off is the volume when the electrode is closed.
It is configured to be 15 to 50% of the product. Soshi
In addition, the cross-sectional area of the puffer cylinder 16 is adjusted appropriately.
Positive adjustment increases pressure against shutoff duty
Is configured to have a sufficiently wide time width. FIG.
0 indicates a strike at the time of the opening operation of the earthing switch shown in FIG.
Roke (opening movement characteristics) and pressure rise in the puffer cylinder
Show characteristics. In this figure, X₀Is an opening position.
When the separation distance (L) from this opening position is sufficiently large
Next, the current and voltage under the conditions as shown in FIGS.
Δp is the lower limit of the pressure rise value so that the conditions can be cut off.₁a
(Initial opening), Δp₁b (end of opening)
You. As you can see from being used in gas circuit breakers,
Because the puffer type arc-extinguishing chamber has excellent breaking performance,
Turn off electromagnetic induction current with a current value of 2000A to 3000A
It is relatively easy to arc and low pressure as shown
Force rise value (Δp₁a, Δp₁The arc can be extinguished in b). However, as shown in FIG.
In order to extinguish such an electromagnetic induction current, FIG.
Such a high transient recovery voltage is applied,
If (L) is not large enough, the interruption will not be successful. this
In FIG. 10, the lower limit pressure that can be cut off at the beginning of opening
Force rise value Δp₁Opening position X where a is obtained₁Separation distance L at
₁Is not large enough to successfully block,
The opening operation further proceeds, and the opening distance L_TwoFor the first time in
Can be determined. Therefore, the opening position X₀ This cut off from
Possible separation distance L_TwoOpening position X where is obtained_TwoTime to
Is the shortest arc time Ta that can be cut off_minAnd the open pole
X₀ From the lower limit pressure rise value Δ that can be cut off at the end of opening
p₁The time until b is obtained is the longest arc that can be interrupted
Time Ta_maxIt is. And the opening position X_TwoPressure rise from
Value Δp₁The time until b is obtained is an arc that can be interrupted.
It becomes the time width Tw. About 4 cycles by the configuration of Fig. 9
The arc time width Tw that can be interrupted is obtained.
Therefore, the zero-miss current as described above can be interrupted.
You. [0010] By the way, the grounding of FIG.
For the switch, make sure that the cylinder volume at the
In order to increase the size of the contact,
Of the cylinder volume C in the puffer cylinder 16
_OIt is necessary to increase. In this case, the movable contact
The sub-portion B is in contact with the outer peripheral surface of the operation rod 15.
Tip support 19a and rear support on the inner periphery of the piston 19
19b supports the center axis
Have been. In such a support structure, at the end of opening
Of the cylinder volume C of the puffer cylinder 16 at
L_OIs large, the puffer cylinder 16
The support of the puffer piston 19 by the tip support portion 19a
The weight of the part on the tip side from the holding point becomes larger,
To give to the tip support 19a of the puffer piston 19.
Bending moment increases. Therefore, the movable contact part
The support state of B becomes unstable, and as a result, the movable contact portion
B and the fixed contact portion A become difficult to maintain the coaxial state.
Damage due to excessive load on sliding parts such as between the contactors 13 and 17
Is more likely to occur. In addition, puffacillin at the end of opening
Length behind the support point of the tip 16 by the tip support portion 19a
L_SMust be longer than a certain length for closing operation.
The length L of the cylinder volume C_OBecomes longer
And the total length L of the puffer cylinder 16_CTBecomes longer. this
As shown in FIG._CTBecomes longer,
Puffer-type arc extinction chamber is enlarged, and the entire earthing switch is enlarged.
Leads to. And when the device becomes large in this way,
Large materials are required, and machining operations are correspondingly difficult.
The problem is that the production cost increases because it becomes difficult
is there. The present invention has the above problems of the prior art.
Is proposed to solve
Form a current zero for several cycles on high-voltage transmission lines
Induction current can be cut off and high reliability
To provide a compact and inexpensive high-speed earthing switch.
You. [0013] SUMMARY OF THE INVENTION A high-speed earthing switch according to the present invention.
Is the puff that forms the cylinder volume that becomes the gas compression chamber.
Puffer Type Arc Extinguishing System with Puffer Cylinder and Puffer Piston
Room, and the transmission line suspension
In the event of a single-line ground fault, open the circuit breakers at both ends of the transmission line.
High-speed closed earthing of transmission lines separated by poles
By doing so, other phases that are maintained in the insulator series and
Extinction of electromagnetic induction current arc from other lines, then opening
By performing the operation, retransmission due to reclosing of the circuit breaker
In a high-speed earthing switch capable of supplying electricity,
The puffer piston of the baffle type arc-extinguishing chamber has a certain feature.
It is constituted so that it may have. That is, the high-speed ground switch of the first aspect.
The puffer cylinder is located in a puffer type arc extinguishing chamber.
Provision of the distal end of the operating rod reciprocally arranged at the center
This operating rod is set at the center of the puffer piston.
Supported by the support
Stone and penetrates the puffer arc extinguishing chamber.
Buffer piston forms the cylinder volume.
At the rear of the tip surface, it is divided by the cylinder volume and the partition.
Having a sub-volume defined and communicating through the communication hole,
Operation rod support provided on the puffer piston
Are arranged in the partition between the cylinder volume and the sub volume.
It is characterized by having been done. [0015] The high-speed ground opening of the present invention having the above-described configuration is provided.
In the closure, behind the tip surface of the puffer piston,
By providing a sub-volume that communicates with the cylinder volume
And reduce the length of the cylinder volume by the sub-volume.
Can be Moreover, provided on the puffer piston
The support portion of the operating rod is provided in
Since it is located on the partition wall with the volume,
While maintaining the cylinder volume, shorten the length of the cylinder volume
The puffer cylinder
At the tip side from the support point by the tip support part of the buffer piston.
The weight of the part can be reduced. As a result,
The bending moment applied to the tip of the piston
Stable support for the movable contact part
can do. [0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, the present invention will be described with reference to a high speed as shown in FIG.
FIGS. 1 to 3 show a plurality of embodiments applied to a grounding switch.
This will be specifically described with reference to FIG. In this case, FIG.
As mentioned, high-speed grounding switch with puffer-type arc-extinguishing chamber
It is sectional drawing which shows the outline | summary of the general structure of a container. Also figure
2 shows a first embodiment of the high-speed earthing switch according to the present invention.
It is a figure, especially, the opening operation of the puffer type arc-extinguishing chamber is completed.
It is sectional drawing which shows the state at the time. (1) First Embodiment FIG. 2 The basic configuration of the first embodiment shown in FIG. 2 is shown in FIG.
This is the same as the conventional example. That is, in FIG.
A fixed contact portion, which is a constant contact portion,
The conductor 8 (see FIG.
Fixed to 1). B is a movable contact portion.
And a cylindrical operation connected to the operation device 9 (FIG. 1) described above.
Puffer cylinder mounted on the outer periphery of the rod 15
16 and inside and outside the tip of the puffer cylinder 16.
From the attached movable contact 17 and the insulating nozzle 18
It is configured. The puffer cylinder 16 contains
A buffer piston 19 is inserted.
Due to the tip surface of the stone 19, the inside of the puffer cylinder 16
Is formed with a cylinder volume portion C which becomes a gas compression chamber.
You. Further, a shield is provided outside the puffer cylinder 16.
14b is arranged. And these puffer pie
The stone 19 and the shield 14b are the grounding container described above.
6 (FIG. 1) fixed via an insulating member or the like.
The movable contact part B is configured to be movable with respect to this fixed part.
Have been. In addition to the above configuration, the present embodiment
In addition, at the rear of the tip end surface of the puffer piston 19,
The sub-volume E is provided with a buffer
Through a communication hole 19c provided on the tip end surface of the piston 19,
And communicates with the cylinder volume C. In this case, the secondary volume
The part E includes the inner peripheral surface of the puffer piston 19 and the operating rod 1.
5 is formed so as to be surrounded by the outer peripheral surface of
Generally, it is desirable that the thickness be 15 mm or more.
No. The dotted line in the figure indicates the closed state, as in FIG.
The position of the movable contact 17 and the insulating nozzle 18
ing. In this embodiment having the above-described configuration,
The volume of the cylinder volume C and the volume of the sub volume E
The volume is the same as the volume of the cylinder volume C of the conventional example in FIG.
Then, the stroke and the pressure rise characteristics at the time of opening are
The characteristics are the same as those of the conventional example shown in FIG. Accordingly
The zero miss current that does not form a current zero for several cycles.
Can be shut off. Particularly, in this embodiment, the puffer pi
The rear end of the tongue 19 communicates with the cylinder volume C
Is provided at the end of the opening operation.
The volume inside the puffer cylinder 16 is the same as that of the conventional example of FIG.
In the case of a similar volume, the amount of syringe
Length L of damper volume C_OCan be shorter than before
You. And, as described above, the length L of the cylinder volume C_O
Can be shortened, so that the movable contact portion B can be stably
Can be supported. Therefore, the movable contact portion B and the fixed contact
It is easy to maintain the coaxial state with the part A, and sliding between the contacts etc.
No excessive load is applied to moving parts,
Can prevent the occurrence of damage. Also, the cylinder volume
Of the puffer cylinder 16
Puffer type because the total length can be shorter than before
Reduce the size of the arc-extinguishing chamber and the overall size of the high-speed earthing switch.
Can be. And the apparatus can be miniaturized in this way.
As a result, the material to be used is reduced in size as in the first embodiment.
And the processing work becomes correspondingly easier.
Use can be reduced. (2) Second embodiment: FIG. The basic configuration of the second embodiment shown in FIG.
Similar to the example, except that in this embodiment
A sub-cylinder 20 is attached to the outer periphery of the rear part of
The inner peripheral surface of the sub-cylinder 20 is
The sub-volume is surrounded by the outer peripheral surface of the stone 19.
A portion F is formed. The sub-volume F is
Communication hole 19c formed in the tip surface of the buffer piston 19
Through the cylinder volume C. In addition,
An airtight seal is provided between the cylinder 20 and the puffer piston 19.
Is provided with a sub-volume 19d.
The hermetic seal of the part F is maintained. In addition, other than this
The configuration is exactly the same as in the first embodiment.
You. In the present embodiment having the above configuration,
The position of the sub-volume portion F differs from that of the first embodiment in design.
And the configuration is substantially the same as that of the first embodiment.
It can be said that it has. That is, in this embodiment,
In the same manner as in the first embodiment, only the sub-volume portion F
Length L of cylinder volume C_OCan be shorter than before.
Wear. Therefore, also in the present embodiment, the second embodiment
The same effects as in the example can be obtained. (3) Other embodiments The present invention is not limited to the above embodiments.
The sub-volume is located behind the tip face of the puffer piston.
The specific configuration can be changed freely.
You. [0025] As described above, according to the present invention,
Forms a sub-volume behind the tip surface of the puffer piston
To improve the volume of the sub-volume
Reduce the length of the cylinder volume by the added volume.
Can be. Therefore, the movable contact part is stably supported.
Can cause damage to sliding parts such as between contacts.
And reduce the overall length of the puffer cylinder
Puffer type arc extinction chamber can be shorter than before
And the entire high-speed grounding switch can be downsized.
Wear. Therefore, according to the present invention, the
The induced current that does not form a current zero for several cycles.
Can be shut off, and is highly reliable, small and inexpensive
A high-speed earthing switch can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an outline of a general configuration of a high-speed grounding switch provided with a puffer type arc-extinguishing chamber. FIG. 2 is a sectional view showing a first embodiment of the high-speed earthing switch according to the present invention, and particularly showing a state at the time of completion of the opening operation of the puffer type arc-extinguishing chamber. FIG. 3 is a view showing a second embodiment of the high-speed earthing switch according to the present invention, and in particular, a cross-sectional view showing a state at the end of the opening operation of the puffer type arc-extinguishing chamber. FIG. 4 is an explanatory diagram illustrating a function of a high-speed grounding switch system for extinguishing a reverse flashing arc of an insulator series in a high-voltage power transmission system. FIG. 5 is an operation sequence diagram of the high-speed grounding switch. FIG. 6 is a current waveform diagram showing an electromagnetic induction current and an electrostatic induction current from another phase to an operation phase of the high-speed grounding switch. FIG. 7 is a voltage waveform diagram showing a transient recovery voltage when the high-speed grounding switch is opened. FIG. 8 is a current waveform diagram showing a current flowing through each phase of the high-speed grounding switch. FIG. 9 is a view showing an example of a conventional high-speed earthing switch, and more particularly, a sectional view showing a state of the puffer type arc-extinguishing chamber at the end of the opening operation. 10 is a characteristic diagram showing a stroke and a pressure rise characteristic of a puffer cylinder during opening operation of the conventional high-speed earthing switch of FIG. 9 and the high-speed earthing switch of the present invention of FIGS. 2 and 3; [Description of Signs] 6 ... Grounding container 7 ... Puffer type arc extinguishing chamber 8 ... Conductor 9 ... Operating device 9a ... Hydraulic cylinder 10 ... Link parts 11a and 11b ... Insulating spacer 12 ... Ground terminal part 13 ... Fixed contacts 14a and 14b ... Shield 15 ... Operating rod 16 ... Puffer cylinder 17 ... Movable contact 18 ... Insulating nozzle 19 ... Puffer piston 19a ... Tip support 19b ... Rear support 19c ... Communication hole 19d ... Airtight seal part 20 ... Sub-cylinder A ... Fixed contact Sliding part B ... Movable contact part C ... Cylinder volume E, F ... Sub volume

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Takeshi Yokota             1-1-1 Shibaura, Minato-ku, Tokyo Co., Ltd.             Toshiba head office F term (reference) 5G001 AA13 BB03 DD03 EE01 GG01                       GG14

Claims (1)

Claims 1. A puffer-type arc-extinguishing chamber having a puffer cylinder and a puffer piston forming a cylinder volume part serving as a gas compression chamber, wherein the arc horn of a series of suspension insulators of a transmission line is subjected to reverse flashing. In the event of a single-line ground fault, the transmission line disconnected by opening circuit breakers at both ends of the transmission line is closed and grounded at high speed, so that other phases and other lines maintained in the insulator series Extinguishes the electromagnetic induction current arc,
Thereafter, by performing an opening operation, in a high-speed grounding switch capable of retransmitting power by re-closing of the circuit breaker, the puffer cylinder is arranged reciprocally at the center of the puffer type arc-extinguishing chamber. The puffer piston of the puffer-type arc extinguishing chamber is provided at the tip of the operation rod, penetrates the puffer piston in a state where the operation rod is supported by a support provided at the center of the puffer piston, A sub-volume section defined by the cylinder volume section and a partition wall and communicated through a communication hole at a rear portion of a front end surface forming the cylinder volume section, and supporting an operation rod provided on the puffer piston. A high-speed grounding switch, wherein a portion is disposed in a partition portion between the cylinder volume portion and the sub volume portion.