JPS5916229A - Disconnecting switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disconnector for power circuits, particularly for use in gas-insulated switchgear.

Originally, a disconnector switches without current, but under certain conditions, it can switch relatively small currents such as the excitation current of a transformer, the charging current of lines, busbars, and the insulators attached to these. has been implemented. When a disconnector switches on and off a small current as mentioned above, the restriking phenomenon that occurs instantaneously when the circuit is closed or cut off causes a surge of high-frequency large current to rush in and cut off through the capacitance of the line or equipment. However, it is known that this causes the surge to shift to the low voltage side control circuit I of the 11L equipment.

On the other hand, as the demand for electricity has increased in recent years, power receiving and substation equipment has been installed in the suburbs of cities where land prices are high. Gas-insulated switchgear is widely used, and as is well known, high-voltage conductors are housed in a grounded container, and most of them form a coaxial cylinder capacitance. , the above-mentioned phenomenon tends to occur, and as a result, a surge occurs in the grounding container and the potential of the grounding wire rises transiently, which poses a danger to the human body and damage to the control line.
This will cause damage to the 3 edges.

Generally, it is known that as a means to suppress surges during opening and closing of switchgear, it is sufficient to connect a resistor in series with the circuit during opening and closing.Also, the resistor can also be used as a disconnector for gas-insulated switchgear. The one installed inside the child was published in 1974.
-139075. However, in gas-insulated switchgear circuits, it is difficult to install a resistor inside the movable contact, which increases in size and weight as the voltage increases in gas-insulated switchgear. Since the movable body is large and heavy, this has the disadvantage that the operating mechanism becomes dramatically larger and more expensive as the voltage increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disconnector with a surge suppressing resistor for a gas-insulated switchgear in which the size of the operating mechanism is less affected by voltage levels by eliminating the above-mentioned conventional drawbacks.

According to this invention, the above-mentioned object includes a fixed contact, a movable contact that is reciprocated in the axial direction and moves toward and away from the fixed contact;
In a disconnector comprising a resistor connected to both contacts in connection with the operation of the movable contact, the movable contact has a movable contact portion that comes into contact with and separates from the fixed contact; AII that can be connected to and separated from the child part! Rondo part and the energization 10
The movable contact portion with the contact portion is electrically separated from the movable contact portion in the direction of separation (
L and l are provided with a connecting part having a spring that biases the l,
Both terminals of the resistor are connected to the movable contact portion and the current-carrying rod portion via current collectors, respectively, and movement in the closing direction at the position where the movable contact portion closes with the fixed contact is This is accomplished by stopping the spring and compressing it into conductive contact with the current carrying rod portion.

Embodiments of the present invention will be described below based on the drawings.

In Figures 1 to 3, 5F6f; 7jl) A disconnector is housed in a cylindrical earthing container 1 (not shown), and this disconnector is connected to the earthing container 1. Coaxially arranged cylindrical fixed contact 2 (
! :, a movable contact 3 which is arranged opposite to the fixed contact 2 and can be brought into contact with and separated from it by reciprocating drive in the axial direction, and the operation of the movable contact 3 (
In this connection, the main component is a resistor 4 connected between the two types of i5T contactors 2 and 3. Movable contact 3? A hollow bar-shaped movable contact portion 5 that comes into contact with and separates from the contactor 2, a short-circuiting contact 6 integrated with the end surface of the intermediate portion of the movable contact portion 5, and a short-circuiting contact 6 that Te6
(1) A movable contact part, a drive device (not shown) that can be brought into contact with and separated from the T-socket (1). A current-carrying rod part 7 connected to the movable contact part 7, and a movable contact part on one side screwed to the end surface of the current-carrying rod part 7 and on the other side. 5
A locking groove 5a in the inner wall, an insulating rod portion 9 (having a joint 8 that can be coupled), an energizing rod portion 7, and a shorting contact 6
and a spring 10 that always electrically biases the two in the direction of separation. And, the i-cho-connection IQ insect 3 is supported in a freely axially movable manner by supports 13 and 14 provided on the electric circuit conductor 11 and the other side of the insulating cylinder 12 whose one side is supported by the electric circuit conductor 11. Ir, I'm here. The joint 81 has a locking groove 5al, and the ball 1 is pressed by a locking spring 15.
A holding part consisting of 6 is provided, and the EJ is
The movable contact portion 5 is designed to maintain the engaged state until the identification contact-f2 comes into contact with the movable contact portion 5. The resistor 4 is composed of a multi-stage stack of donut-shaped elements, and is fixed by a supporting flange 17 of a collector 14 that is inserted through an insulating cylinder 12i and supported by an insulating cylinder 12i and screwed to the other side of the insulating cylinder 12i. One terminal of 4 is connected to the current-carrying rod portion 7 via a current collector 13, and the other terminal is connected to the movable contact portion 5 via a current collector 14.

The operation in the above configuration is performed by the axial movement of a drive device (not shown) connected to the current-carrying rod portion 7. For example, the closing operation is performed by moving the current-carrying rod portion 7 to the right from the open circuit state force in FIG. The steel ball 16 of the joint 8 is in the locking groove 5a.
The movable contact portion moves together in the engaged state with the outer periphery of the movable contact portion 5 (reaching a second state in which the stepped portion 5b provided thereon is in contact with the support 14a of the current collector 14). If the conductor 11 is connected to the source f, the current flows through the conductor 1
1 to resistor 4. Support flange 17. It flows through the support 14a, the current collector 14 and the movable contact portion 5 in sequence to the fixed contact 2. Thereafter, as the current-carrying rod portion 7 continues to move to the right, the steel ball 16 and the locking groove 5a are disengaged, and the spring 10 is compressed, and the insulating rod portion 9 is moved to the movable contact portion 5.
The current-carrying rod portion 7 shown in FIG.
The end face of the short-circuit contactor 9 comes into contact with the resistor 4 to short-circuit it,
Also, the movable contact portion 5 and the fixed contact 2 are in a closed state of the disconnector. The current flows from the conductor 11 to the collector 13° current-carrying rod portion 7. It flows sequentially through the shorting contact 6 and the movable contact part 5 to the fixed contact. Note that the circuit opening operation is performed by the operation of each part in the opposite direction to the aforementioned circuit closing operation as the current-carrying rod portion 7 moves to the left, and the state returns from the state shown in FIG. 3 to the state shown in FIG. 2 through the state shown in FIG.

Therefore, for both opening and closing operations, the resistor 4 is first connected in series with the electric circuit, and the resistor 4 suppresses the surge, and then the circuit is opened or closed.

Next, another embodiment of the present invention will be described with reference to FIG. In the figure, the difference from the embodiment shown in FIG. 1 is explained as follows: the elastic connection between the movable contact portion 6 and the current-carrying rod portion 7 by the insulating rod portion 9 is different from the movable contact portion 511! 1 is fixed and the current-carrying rod portion 7 side is movable. Therefore, the current-carrying rod portion 7 has a storage space 7a for the spring 1O, a locking groove 7b for the steel ball 16 of the joint 8, and a short circuit. A contact 6♂ is provided. Therefore, not only the function but also the operation is the same as that of the embodiment shown in FIG. 1, so a description thereof will be omitted.

In both embodiments, the resistor 5 has a stacked structure of donut-shaped elements, but the resistor 5 may be arranged so as to surround the insulating tube 12 using rod-shaped elements.

As explained above, according to the present invention, the resistor is fixed to the supporting part of the movable contact, and the contact that energizes or shorts the resistor is provided between the movable contact and the coaxial operating rod. A disconnector made of a surge suppressing resistor material for a gas insulated switchgear whose operating mechanism does not dramatically increase in size even when voltage is applied is obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part showing an open state of an embodiment of a disconnector equipped with a surge suppressing resistor for a gas-insulated switchgear according to the present invention, and FIG. 2 is a longitudinal cross-sectional view of a main part showing the operation process of FIG. 3 is a top view of FIG. 1, a vertical cross-sectional view of a main part showing a closed state, and FIG. 4 is an open state of another actual MJi example of a disconnector equipped with a surge suppressing resistor of a gas insulated switchgear according to the present invention. FIG. 2: Fixed contact, 3: Movable contact, 4: Resistor, 5:
oj dynamic follower contact part, 7: Current carrying rod part, 9: Insulating rod part, 10: Spring, 13.14: Current collector.

Claims (1)

[Claims] 1) Comprising a fixed contact, a movable contact that is driven reciprocally in the axial direction to move toward and away from the fixed contact, and a resistor that is connected to open both contacts in relation to the operation of the movable contact. In the disconnector, the movable contact includes a movable contact part that comes into contact with and separates from the fixed contact, a current-carrying rod part that can come into contact with and separate from the movable contact part, and a current-carrying rod part and the movable contact part. The terminals of the resistor are connected to the movable contact portion and the current-carrying rod portion via current collectors, respectively, and the movable The contactor portion is moved in the closing direction at a position l where it closes with the fixed contactor, and the spring is compressed and brought into conductive contact with the iB electric rod portion. Disconnector.