JP3259979B2 - 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 with a resistor suitable for increasing the voltage of a power transmission system, and more particularly, to a method for stably fixing a resistor connected in parallel with a main contact in a circuit breaker container. According to the technology.

[0002]

2. Description of the Related Art A circuit breaker with a closing resistor has been conventionally known as a 500,000 volt class circuit breaker. This circuit breaker is used for a 500,000 volt class power transmission system. When a no-load power line is connected, a large overvoltage is generated. Then, after the resistor is turned on to suppress the overvoltage, the main contact is turned on.

FIG. 2 shows an example of such a circuit breaker with a closing resistor. That is, in this prior art, when the main contact 1 connected to the external conductor 5 is housed in the cylindrical circuit breaker container 6 having the manhole 7, the main contact 1 and the resistance contact 2
Are arranged so as to be parallel to the central axis in the longitudinal direction of the container, and the positions of both ends of the operation mechanism 4 are aligned. A resistor 3 connected in series to the resistance contact 2 is arranged in a space created by the difference in length between the main contact 1 and the resistance contact 2. Further, the main contact 1 and the resistance contact 2 are connected to the operation mechanism 4 via the crank mechanism 8. In the prior art having such a configuration, since the resistor 3 can be stored in the space generated by the dimensional difference between the main contact 1 and the resistance contact 2 just right, the circuit breaker as a whole can be reduced in size.

[0004]

By the way, with the recent increase in the voltage of the power transmission system, ultra-high-voltage power transmission such as one million volt (UHV) is also planned. Such UH
In the case of a V-class circuit breaker, a method may be adopted in which a resistor is inserted in parallel with the main contact at the time of breaking to mitigate an increase in a re-motive voltage after the breaking at the main contact, thereby facilitating the breaking. In addition, 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 are 30 to 40 ms after the main contact has been turned off.
Since it is necessary to disconnect from the circuit later, it is necessary to provide a resistance contact in series with the resistor in order to take the disconnection timing, in addition to simply connecting the main contact in parallel. Therefore, in a UHV-class circuit breaker, it is conceivable that the resistance required at the time of or after the interruption and the contact thereof are also used as the closing resistance and the closing resistance contact used for the 500,000 volt class.

However, in the UHV class, the capacity of this type of resistor is four times the voltage and three to four times as long as the 500,000 volt class.
That is, a large volume is required. Therefore, the structure of the conventional circuit breaker with a resistor as shown in FIG.
When applied to a UHV-class circuit breaker that requires such a large resistor, the resistor 3 is too large in volume as shown in FIG. In the case of the 500,000 volt class, it was sufficient to perform the closing operation of the resistive contact 2, but in the case of the UHV class, it was necessary to cut off the resistance current after the main contact 1 was completely cut off. It must be larger than a circuit breaker.
Furthermore, the resistance contact 2 is connected to the main contact 1 by 30 to 4 at the time of interruption.
Since a complicated operation of opening the electrode with a delay of 0 ms is required, the connecting mechanism including the operating mechanism 4 and the crank mechanism 11 must be complicated and large.

On the other hand, it is necessary to design the circuit breaker so that the higher the voltage class, the faster the insulation recovery characteristic. However, in this case, it is necessary to increase the opening speed of the circuit breaker. It is desirable that the connection mechanism for connecting the power supply and the blocking unit has a structure as simple as possible to enhance reliability. In other words, to improve the reliability of the circuit breaker, the main contact 1
And how the resistor contact 2 and resistor 3 are compact
The important points are whether or not the connection mechanism is connected to the operation mechanism 4 and whether or not the connection mechanism is simple. However, as described above, in the UHV-class circuit breaker, all components are upsized. In particular, the ratio of the upsizing of the resistor 3 is large, and the circuit breaker has a compact structure unless the arrangement of the resistor 3 is reviewed. Can not be.

Usually, in this type of circuit breaker, the main contact 1 is attached to a box-shaped member (not shown) having a high mechanical strength called a center piece provided at the center of the container 6. It is supported by a portable type. Therefore, the main contact 1
The resistance contact 2 arranged in parallel to the center piece also has the end on the center side of the container 6 supported by the centerpiece in a cantilever manner. In this case, if the resistor 3 is small and lightweight, like the 500,000 volt class in FIG. 2, it is possible to support the resistor 3 at the tip of the cantilevered resistance contact 2, but FIG. In the case of the UHV class expression as shown in the following, since the resistor 3 is large and heavy, it is difficult to support the resistor 3 only by the tip of the cantilevered resistance contact 2. Therefore, the conventional U
In the case of the HV circuit breaker, each part may be loosened during transportation or operation of the circuit breaker unless troublesome measures such as strengthening by providing an insulating support structure 10 or the like in an intermediate portion between the resistance contact 2 and the resistor 3 are taken. Or fall off.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and an object of the present invention is to arrange a main contact, a resistance contact, and a resistor in a container in a well-balanced manner, Eliminating wasted space and enabling downsizing of the circuit breaker, simplifying the connection mechanism between the operating mechanism and each contact, improving the reliability of the circuit breaker, and stabilizing a large and heavy resistor It is an object of the present invention to provide a circuit breaker with a resistor that can be fixed by using a resistor.

[0009]

To achieve the above object, according to the Invention The resistance circuit breaker with the present invention is to place a longitudinal central axis parallel to the main contacts and the resistors of the cylindrical container, wherein in
Operation with operating rod driven perpendicular to the mandrel
A mechanism for driving the operating rod and opening the resistance contact
Connect the resistance contact to the main contact so that the closing direction is linear.
It is characterized by being arranged at right angles to the point .

In the present invention having the above-described structure, the resistance contact is arranged at a right angle to the main contact, so that a space having the same length and parallel to the main contact can be used for a large resistance contact. it can. In addition, since the longitudinal direction of the resistance contact is arranged vertically, it can be fixed with a comfortable strength without any freedom, there is no problem even if a heavy resistor is attached, and the insulation for supporting the resistor Objects are not required. In particular, since the present invention is configured such that the driving direction of the operating rod and the opening and closing direction of the resistance contact are linear, a crank mechanism for changing the driving direction is not required, and the installation space can be effectively utilized and the resistance can be reduced. The contacts can have a simple and highly reliable configuration. Further, it is possible to simplify the inspection or replacement work of each part.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to FIG. In this embodiment, the present invention is applied to a two-point UHV-class gas circuit breaker, and includes a main contact 1, a resistance contact 2, and a resistor 3. In this case, from the analysis result of the overvoltage suppression in the UHV-class circuit breaker, the resistance value of the resistor 3 is required to be 750Ω, and is set to 375Ω per point.
As a result, by combining the resistance elements in series / parallel, the length of the resistor 3 is configured to be substantially the same as the main contact 1. On the other hand, the operating mechanism 4 is disposed substantially below the center of the circuit breaker container 6 in which the insulating gas is sealed.
Is configured to move each operation point by moving the operation rod at right angles to the longitudinal direction. Both the main contact 1 and the resistor 3 are arranged at positions parallel to the longitudinal center axis of the container 6 with their ends on the operation mechanism 4 side together. The resistance contact 2 is disposed at a position where the operation direction is perpendicular to the central axis of the container 6 and the opening and closing direction is in line with the driving direction of the operation mechanism 4. In this case, the main contact 1 is fixed to the centerpiece with a cantilever breaker, and the resistive contact 2 is fixed vertically on the centerpiece, similarly to a conventional breaker.

In the circuit breaker with a resistor according to the present embodiment having such a configuration, the resistor 3 and the main contact 1 are arranged parallel to each other with their axes aligned in the longitudinal direction of the container 6. The space can be effectively used, and the diameter and length of the container can be reduced. Further, since the opening and closing direction of the resistance contact 2 coincides with the driving direction of the operation mechanism 4, a crank mechanism for changing the driving direction is not required, and the resistance contact 2 has a simple and highly reliable configuration. Also, since the resistance contact 2 is fixed vertically to the center piece,
The mounting strength is improved and the stability is excellent as compared with the conventional cantilever type. Further, the resistor 3 connected to the resistance contact 2 is also supported not by the cantilever type but by the resistance contact 2 firmly fixed to the center piece. Is also unnecessary. In addition, in this embodiment, the two resistive contacts 2 of the two-point breaker are arranged at the center of the container 6, so that the main contact 1 provided at the upper center of the container 6 is used for checking the crank mechanism. Using the manhole 7, inspection and replacement work of the two resistance contacts 2, 2 can be performed. Therefore, it is not necessary to provide a manhole dedicated to each member in the container 6, and the configuration of the container 6 can be simplified.

[0013]

As described above, according to the present invention, a resistor having substantially the same length as the main contact is arranged in alignment with the longitudinal direction of the circuit breaker container, and the resistance contact is fixed vertically. By this means, the circuit breaker can be miniaturized by effectively utilizing the space in the container, and the reliability of the drive mechanism of each contact can be improved, and the inspection or replacement work of each part can be simplified. And a circuit breaker with the same.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a circuit breaker with a resistor according to the present invention.

FIG. 2 is a sectional view showing an example of a conventional 500,000 volt class circuit breaker.

FIG. 3 is a cross-sectional view showing a configuration when the configuration in FIG. 2 is applied to a UHV class.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main contact 2 ... Resistance contact 3 ... Resistor 4 ... Operating mechanism 5 ... Conductor 6 ... Container 7 ... Manhole 8 ... Crank mechanism

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kuri Ikeda 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Hamakawasaki Plant, Toshiba Corporation (72) Inventor Shigeki Nishizumi 2-Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1 Inside the Hamakawasaki Plant of Toshiba Corporation (56) References JP-A-64-89127 (JP, A) JP-A-3-187116 (JP, A) JP-A-4-73834 (JP, A) JP-A-57 157 415 (JP, A) JP-B 46-1825 (JP, B2) JP-B 39-5252 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 33/00- 33/26 H01H 9/30-9/52

Claims (1)

(57) [Claims] 1. A circuit breaker with a resistor in which a series circuit of a resistor and a resistance contact is connected in parallel to a main contact, wherein the main contact and the resistor are arranged in parallel with a central axis in a longitudinal direction of the cylindrical container. Driven at right angles to the central axis
An operating mechanism having an operating rod, wherein the driving direction of the operating rod and the opening and closing direction of the resistance contact are
Orient the resistance contact perpendicular to the main contact so that it is linear
A circuit breaker with a resistor, characterized in that it is arranged in a circuit breaker.