JP3400016B2 - Circuit breaker with resistance - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker used in a substation of a high-voltage power system, and in particular, a resistance contact for making and breaking through a resistance is provided in parallel with a main contact. The present invention relates to a circuit breaker with a resistance.

[0002]

2. Description of the Related Art In a substation of a high-voltage power system, etc., a tank filled with an insulating gas such as SF6 gas is
A gas circuit breaker containing the main contact is used. In such a circuit breaker, in a gas circuit breaker for 500,000 volts, when an unloaded transmission line is turned on, a large overvoltage is generated. Therefore, a resistor may be used to suppress this. is there. In this case, 10 is required for closing the main contact.
The main contact is turned on after inserting a resistor for about ms to suppress overvoltage. At this time, the energy consumed by the resistor is about several Mjoules, and the volume of the resistor
Neither length nor weight is so large compared to the main contact. Therefore, it is possible to obtain sufficient mechanical strength by disposing such a small and lightweight resistor in parallel with the main contact and fixing both ends of the resistor to the main contact with bolts or the like.

In recent years, as the voltage of power transmission systems has increased, 100
An ultra-high voltage (UHV) transmission system such as 10,000 volts is also planned. In such a UHV gas circuit breaker, with the development of the breaking technology in recent years, it is attempted to cope with the two-point break main contact. In addition, not only at the time of turning on but also at the time of breaking, by inserting a resistor in parallel with the main contact, it is possible to reduce the rise rate of the re-elevation voltage after breaking that occurs in the main contact and to make the breaking easier. is there. Further, a resistor may be inserted in parallel with the main contact in order to suppress an overvoltage generated after interruption of a ground fault or the like. These resistors need to be disconnected from the circuit 30-40 ms after completion of the interruption, thus requiring resistive contacts for the resistors. In addition, at the time of closing, similar to the circuit breaker for 500,000 volts, the main contact is closed after the preceding voltage is applied through the resistor to suppress overvoltage.

In the resistor used in such a UHV circuit breaker, the energy to be processed becomes extremely large, and specifically, it is 20 to 30 as compared with the resistor of the above-mentioned circuit breaker for 500,000 volts. It needs to absorb twice as much energy. As a result, the resistor volume, length,
The weight is much larger than that of a circuit breaker resistor for 500,000 volts. In particular, in order to obtain the required withstand voltage performance, it is necessary to stack disk-shaped resistor elements in multiple stages, and the length of the resistor becomes considerably longer than in the past, and the volume of the resistor is accordingly reduced. It gets bigger and heavier.
With such an extremely long and heavy resistor, it is difficult to secure sufficient mechanical strength by fixing only both ends with bolts or the like as in the conventional case. As a result, in this UHV circuit breaker, the resistor is supported on the metal container or the main contact by a support insulator made of epoxy resin, fluorine resin or the like.

[0005]

However, the above-mentioned UHV circuit breaker is larger in size than the circuit breaker for 500,000 volts, and its operating temperature range is 500,000 volts. It is expected that it will be extremely wider than the breaker. In this case, when the heat from the resistor whose temperature rises is transferred to the supporting insulator that supports the resistor on the metal container or the main contact, this heat deteriorates the supporting insulator and It becomes impossible to maintain sufficient strength to support it. Then, when the thermal deterioration of the supporting insulator progresses, a large stress is applied to the resistor and the supporting insulator supporting the resistor, and the resistor may be cracked or the supporting insulator may be damaged. is there. Moreover, if the hot arc-extinguishing gas blown to the arc from the arc-extinguishing chamber of the main contact is blown directly onto this supporting insulator, the heat deterioration of the insulator will be further accelerated, and the durability of the circuit breaker will be further shortened. There is also a possibility.

The present invention has been proposed in order to solve the problems of the prior art as described above, and an object thereof is to prevent thermal deterioration of a supporting insulator of a resistor and to improve reliability and durability. It is to provide an excellent circuit breaker with resistance.

[0007]

In order to achieve the above object, the invention according to claim 1 provides a gas tank filled with an insulating gas.
Main contact with movable part and fixed part, fixed to movable part
A resistive contact having a portion and a resistor are housed therein,
The anti-contact and the resistor are connected in series and this series circuit and
In a circuit breaker with a resistor in which the main contact is connected in parallel,
The resistor may be the gas tank or
It is supported by the main contact and between this support insulator and the resistor.
A heat insulating material is provided.

According to a second aspect of the invention, a shield with a resistance as described above is provided.
In the breaker, the resistor is connected to the insulator by a supporting insulator.
It is supported on the stank or the main contact and is
Between the contacts is a shield plate for hot gas generated when the main contact is opened.
Is provided and between the supporting insulator and the resistor.
Is characterized by being provided with a heat insulating material.

[0009]

[Function] The circuit with resistance according to claim 1, which is configured as described above.
In the container, it was placed between the resistor and the supporting insulator.
The heat generated by the resistor is transferred to the supporting insulator by the heat insulating material
Is suppressed, and thermal deterioration of the supporting insulator is prevented.
It

In the circuit breaker with resistance according to claim 2, the shield is provided.
The effect of preventing thermal deterioration is more effective by using a plate and a heat insulating material together
Will be demonstrated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a circuit breaker with a two-point cutoff resistor will be specifically described below with reference to FIGS.

(1) First embodiment: FIG . 1 In the circuit breaker with a two-point cutoff resistor according to the first embodiment shown in FIG . 1 , a center piece 1 and a support insulating cylinder 2 which are support structures made of a box-shaped metal. An arc-extinguishing chamber insulating operation rod 3 is arranged through the inside. The center piece 1 is supported and electrically insulated from the gas tank 4 by the support insulating cylinder 2 arranged below the center piece 1. Here, the gas tank 4
Is a sealed ground metal container filled with insulating gas. Main contacts are provided on both sides of the center piece 1. Each of the main contacts has an arc extinguishing chamber 5, and the arc extinguishing chamber 5 is arranged in a straight line coaxial with the longitudinal direction of the gas tank 4. In this case, since the arc extinguishing chamber 5 of each main contact is symmetrically provided via the center piece 1, the arc extinguishing chamber 5 on one side is omitted in the drawing.

Each arc extinguishing chamber 5 includes an arc extinguishing chamber movable part 5a including a movable contact, a puffer cylinder 5b, an insulating nozzle 5c, an operating rod 5d, an arc extinguishing chamber fixing part 5e including a fixed contact, and an arc extinguishing chamber. It has an inter-electrode support insulator 5f that supports between the movable part 5a and the arc extinguishing chamber fixing part 5e. This arc-extinguishing room 5
Is attached to the center piece 1 on the arc-extinguishing chamber movable portion 5a side, supported by the center piece 1 and electrically connected thereto.

A resistance contact 6 is arranged on each main contact in parallel with the arc extinguishing chamber 5. These resistance contacts 6 include a resistance contact movable part 6a including a movable contact, a resistance contact fixed part 6b including a fixed contact, and an inter-electrode support that supports between the resistance contact movable part 6a and the resistance contact fixed part 6b. It has an insulator 6c. The resistance contact 6 is attached to the center piece 1 on the resistance contact moving part 6a side, is supported by the center piece 1 and is electrically connected thereto. Therefore, the resistance contact moving part 6a and the arc-extinguishing chamber moving part 5a. Are electrically connected to each other via the center piece 1.

On the resistance contact fixing portion 6b side of the resistance contact 6,
One end of a resistor 7 formed by stacking a plurality of elements so as to have a U-shape as a whole is attached, and both are electrically connected in series. The other end of the resistor 7 is attached to and electrically connected to the arc extinguishing chamber fixing portion 5e. The central portion of the U-shaped resistor 7 projects from the end of the arc extinguishing chamber 5, and this projecting portion is supported by the gas tank 4 by the support insulator 2a. As a result, the arc extinguishing chamber 5, the resistance contact 6 and the resistor 7 are supported by the gas tank 4 by the supporting insulating cylinder 2 and the supporting insulator 2a, whereby the resistance contact 6 and the resistor 7 are arranged in parallel with the arc extinguishing chamber 5. It is connected to the. A conductor 8 is attached to the arc extinguishing chamber fixing portion 5e to connect it to an external circuit, and is led out to the outside via an insulating spacer 9 for gas division.

On the other hand, inside the center piece 1 and the support insulating cylinder 2, a resistance contact insulating operating rod 10 is arranged in parallel with the arc extinguishing chamber insulating operating rod 3 described above. These insulating operation rods 3 and 10 are arranged in a direction orthogonal to the arc extinguishing chamber 5 and the resistance contact 6, and are connected to the arc extinguishing chamber moving part 5a and the resistance contact moving part 6a at one end thereof, respectively. The other end is connected to the arc extinguishing chamber operating mechanism 12 and the resistance contact operating mechanism 13 via the crank mechanism 11, respectively.

By the way, in the portion of the arc extinguishing chamber 5 having the above-mentioned structure facing the supporting insulator 2a, the supporting insulator 2a is shielded from the hot gas blown out from the arc extinguishing chamber 5 when the main contact is opened. A shielding plate 2b is provided.

According to this embodiment having such a structure, the supporting insulator 2a is shielded from the hot gas blown out from the arc extinguishing chamber 5 by the shield plate 2b when the main contact is opened.
It is possible to prevent the supporting insulator 2a from being deteriorated due to the direct blowing of the hot gas.

(2) Second embodiment: FIG . 2 A circuit breaker with a two-point breaking resistor according to a second embodiment shown in FIG . 2 has main contacts 2 arranged on both sides of the central part of the circuit breaker.
1, a resistance contact 22, and a resistor 40 arranged in parallel with the main contact 21. Further, there is provided a central support insulator 24 which supports the central portion of the resistor 40, an end support insulating cylinder 25 which supports the end portion of the resistor 40, and a main insulating cylinder 26 which supports the main contact 21. Further, in the figure, 27 is a gas tank filled with an insulating gas, and 28 is a gas tank 2.
Insulating spacers for dividing the inside and outside of 7 into gas, 29 is a connecting conductor with an adjacent device, 30 is a center piece connecting between the two main contacts 21, and 31 and 32 are end supports for supporting both ends of the resistor 40, respectively. It is a metal member.

That is, the center piece 30 is fixed on the main insulating cylinder 26 which is established from the grounded gas tank 27, and a pair of main contacts 21 are provided on both sides of the center piece 30 in the same axial direction as the gas tank 27. They are arranged in a line, are mechanically fixed to the center piece 30, and are electrically connected. In other words, the main contacts 21 are electrically and mechanically connected in series via the center piece 30. In this case, the main contact 21 includes a main contact moving portion 21a, a main contact fixing portion 21b, and an inter-electrode support insulator 21c that mechanically connects them, and the main contact moving portion 21a side has a center piece. A central support insulator 24 is mounted on the main contact fixing portion 21c while being electrically and mechanically connected to the main contact fixing portion 21c. An end supporting insulating cylinder 25 is attached on the center piece 30, and a resistance contact 22 is coaxially arranged in the internal space of the end supporting insulating cylinder 25.

Each of the resistors 40 is arranged above the corresponding main contact 21 in parallel with the main contact 21. Each of these resistors 40 has a resistance unit 4
1, 42 are connected in series by a connecting portion 43. This connecting portion 43 is connected to the resistance units 41 and 42.
The central supporting metal member 44 for supporting the abutting portions 41a, 42a is provided. By combining a finger, a spring, or the like between the central supporting metal member 44 and the resistance units 41, 42, the abutting portions 41a, 42a are
It is attached to the central supporting metal member 44 so as to be slidable in the axial direction of the resistor 43.

One end portion of the resistor 40, that is, the end portion 41b of the resistance unit 41 opposite to the butting portion 41a is bolted to the end supporting metal member 31 supported by the end supporting insulating tube 25. Is fixed by
The end supporting metal member 31 is electrically and mechanically connected. That is, the end portion 41b of the resistance unit 41
Is connected in series with the resistance contact 22 via the end supporting metal member 31, and is further electrically connected with the main contact moving part 21a via the center piece 30. The end 41b of the resistance unit 41 is supported by the center piece 30 via the end supporting metal member 31 and the end supporting insulating tube 25, and is mechanically fixed to the main contact moving part 21a. .

On the other hand, the other end portion of the resistor 40, that is, the end portion 41b of the other resistance unit 41 opposite to the abutting portion 42a is attached to the end portion of the main contact fixing portion 21b. It is fixed to the member 32 by a bolt, and is electrically and mechanically connected to the main contact fixing portion 21b via the end supporting metal member 32. The end support metal member 32 has a connection conductor 29 for external drawing.
Are connected to the insulating spacer 2
Supported by 8.

By the way, in the present embodiment, the central supporting metal member 44 of the resistance unit 41 is the central supporting insulator 2
Insulatingly supported by the main contact fixing portion 21b by 4, the central portion of the resistor 40 is supported by the main contact 21. In this case, the heat insulating material 50 is disposed on the contact surface between the central supporting insulator 24 and the central supporting metal member 44. As the heat insulating material 50, mica, ceramics, or the like that is easy to process and has excellent strength is used. Further, in the illustrated embodiment, the plate-shaped heat insulating material 5 is used.
0 is inserted between the support metal member 44 and the support insulator 24, but as a means for disposing the heat insulator, the surface of the support insulator is integrally coated, or the support metal member and the heat insulator are integrated. It can also be molded into a single component. In that case, it becomes possible to simplify the support structure of the resistor and simplify the work of assembling the circuit breaker.

According to this embodiment having such a structure, even if heat is generated in the resistor 40 portion, the heat is suppressed from being transferred to the supporting insulator 24 side by the heat insulating material, and the supporting insulator 24 Thermal deterioration is prevented.

(3) Other Embodiments The present invention is not limited to the above-mentioned embodiments. For example, the number and position of supporting insulators provided with a heat insulating material or a shielding plate for hot gas can be freely selected. It is possible to appropriately select a rod shape or a tubular shape. Further, the present invention is not limited to a two-point breaker, and is widely applicable to all circuit breakers with a resistance including a main contact and a resistance contact. Of course, from claim 2
As is apparent, it is possible to combine the first and second embodiments, and in that case, the heat resistance of the supporting insulator can be further improved by the synergistic effect of the shielding plate and the heat insulating material. .

[0027]

As described above, according to the present invention, by using the shielding plate and the heat insulating material alone or in combination,
It is possible to provide a highly reliable breaker with resistance, which is effective in preventing thermal deterioration of the supporting insulator and has excellent heat resistance and durability.

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of a first embodiment in which the present invention is applied to a circuit breaker with a two-point cutoff resistor.

FIG. 2 is a sectional view showing a configuration of a second embodiment in which the present invention is applied to a circuit breaker with a two-point cutoff resistor.

[Explanation of symbols]

1 ... Centerpiece 2 ... Support insulating cylinder 2b ... Shielding plate 3 ... Insulated operating rod for arc extinguishing chamber 4 ... Gas tank 5 ... Arc extinguishing room 6 ... Resistive contact 7 ... resistance 21 ... Main contact 22 ... Resistive contact 40 ... Resistor 24 ... Central support insulator 25 ... End support insulating cylinder 26 ... Main insulation cylinder 27 ... Gas tank 30 ... Centerpiece 31, 32 ... End supporting metal member 41, 42 ... Resistance unit 43 ... Connection part 44 ... Central supporting metal member 50 ... Insulation

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Sato, 2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Toshiba Corporation Hamakawasaki factory (72) Inventor, Taeri, Shibaura 1-1-1, Minato-ku, Tokyo Stock company Toshiba Head Office (72) Inventor Motofumi Fukui 66-2 Horikawa-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Engineering Co., Ltd. (56) Reference JP-A-3-122930 (JP, A) JP-A-55 -17929 (JP, A) JP-A-4-73834 (JP, A) JP-A-2-152130 (JP, A) JP-A-3-165413 (JP, A) JP-A-6-36656 (JP, A) ) Japanese Patent Laid-Open No. 6-52758 (JP, A) Actual Development Sho 61-189547 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01H 33/16 H01H 33/53 H01H 33 / 70

Claims (2)

(57) [Claims] 1. A main contact having a movable part and a fixed part, a resistance contact having the movable part and the fixed part, and a resistor are housed in a gas tank filled with insulating gas, and the resistance contact and the resistor are connected in series. In the circuit breaker with resistance in which the series circuit and the main contact are connected in parallel, the resistor is supported by the gas tank or the main contact by a supporting insulator, and between the supporting insulator and the resistor. Is a circuit breaker with resistance, characterized in that a heat insulating material is provided. 2. A gas contact filled with an insulating gas contains a main contact having a movable part and a fixed part, a resistance contact having the movable part and the fixed part, and a resistor, and the resistance contact and the resistor are connected in series. In the circuit breaker with resistance in which the series circuit and the main contact are connected in parallel, the resistor is supported by the gas tank or the main contact by a supporting insulator, and between the supporting insulator and the main contact. A circuit breaker with resistance, wherein a shield plate for hot gas generated when the main contact is opened is arranged, and a heat insulating material is arranged between the supporting insulator and the resistor.