JPS5947412B2 - Grounded tank type gas shield disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a grounding type gas breaker, and more particularly to a closing resistance device installed electrically in parallel with the breaker.

[Background of the invention]

The insulation strength of ultra-high voltage equipment is determined by the level of switching surges, so it is necessary to suppress switching surges to as low a value as possible, and the resistance injection method is an easy and highly effective way to do this.

Therefore, it is common to provide a closing resistance device in parallel with the main breaker point.

This closing resistor device is configured to close the circuit in advance by approximately 1/2 cycle from the breaker, and during this preliminary closing time, all current flows through the closing resistor.

Therefore, the capacity of the closing resistor is determined by the resistance value that brings about the necessary voltage drop and the heat capacity that will keep the temperature below the allowable temperature for the preceding closing time, and the longitudinal dimension is very large compared to the main breaker point. This has the drawback that the longitudinal dimension of the breaker becomes larger due to the size of the resistor device.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact breaker in which a closing resistor is effectively housed within a grounded tank.

[Summary of the invention]

In the present invention, the closing resistor is divided into two in the axial direction, one has a longer axial length than the other, the shorter resistor is placed on the opposite side from the fixed contact, and the longer resistor is fixed. They are placed side by side on the contact.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view showing the Pannoa type gas breaker in the closed state.

A manhole 2 provided in a cylindrical grounded tank 1 is used for inspection and assembly work inside the breaker.

An operation section (not shown) is provided outside the grounded tank.

Shutoff unit 4, closing resistance device 5, voltage sharing capacitor/server 6
etc. are insulated and supported within the grounded tank 1 by an insulating support tube 7.

The insulated operating rod 8 has a lower end connected to the operating section and an upper end connected to the link mechanism 9, and transmits the driving force from the operating section to the breaker section 4 and the closing resistance device 5.

The breaker 4 is made up of a movable contact 10 and a fixed contact 11 facing the movable contact 10, and a capacitor 6 for equalizing the voltage distribution of the breaker 4 and a resistor 5 for suppressing surge surges are electrically connected to each other. are connected in parallel and juxtaposed.

When the insulating operation rod 8 is driven in the direction of the arrow (the breaker direction) by the operating section, the breaker and closing resistor device having the above-described structure causes the movable contact 4 and the closing resistor drive rick 1 to move.
3 each performs a separating operation.

Also, when the closing operation is performed by being driven in the opposite direction (closing), the movable closing resistance contact 12 will cycle approximately 1/2 cycle (approximately 8 to
ioms) will be introduced in advance.

At this time, the current flows through the resistance device 5, so the closing resistor 1
The length of the resistor 16 is determined by the heat capacity of the resistor 16.

Since this axial length is larger than the contactor portion 4, simply arranging them side by side results in a breaker with a large axial length.

FIG. 2 shows details of the resistor device section.

The closing resistor is divided into two sets: a resistor 16a with a large axial length and a resistor 16b with a small axial length.

The right end of the resistor 16a and the right end of the resistor 16b are electrically connected by a conductor 21.

The left end of the resistor 16b is connected by a metal fitting 22 to the conductor 3 that supports the fixed contact 11 of the breaker 4, and current flows to 22-16a-21-16b-15-12.

As can be seen from FIG. 1, a conductor 3 is fixed to an insulating support tube 7' fixed to a grounded tank 1.

The free end side of the conductor 3 has a fledge or end face, the fixed contact 11 is attached to the left face, and the left end of the resistor 16b is supported and fixed to the right face.

The contact portion of the breaker 4 and the contact portion of the closing resistor 5 are arranged in the vicinity in consideration of the influence of the electric field.

Therefore, the long resistor 16a is connected to the contact 1 of the closing resistance device 5.
It is arranged almost coaxially with 2.15.

Since the resistor 16a is long, it extends beyond the free end of the conductor 3 toward the insulating support cylinder 7'.

If the closing resistor device 5 is configured only with this long resistor 16a, as shown in FIG. Even if the shield tube 23 is provided, there will be an unused space inside the shield tube 23.

Therefore, the short resistor 16b is arranged so as to be folded back to the conductor 22.

Moreover, since this short resistor 16b does not extend beyond the conductor 22 to the fixed contact 11 side, the shield tube 23 does not need to be enlarged.

Also, since the axial length of the voltage dividing capacitor/server 6 is shorter than that of the closing resistor 5, the space inside the shield tube 23 after the conductor 22 is wasted, but it can be utilized more effectively due to the arrangement of the short resistor 16b. It's getting messy.

Furthermore, when viewed from the shield tube 23, by providing the shield tube 23 so as to surround the resistors 16a and 16b folded in half, it is possible to prevent an increase in size due to electric field concentration in this portion.

When the movable resistance contact 12 operates to close the fixed resistance contact 15, a closing force acts on the long resistor 16a, so it is necessary to fix the long resistor 16a so that it does not move due to the applied force.

In this embodiment, one end 17' of the insulating rod 17a that fastens the long resistor 16 is effectively used, and the resistor 16a and
Since the structure is such that it is fixedly supported by the metal fitting 20 through the length of the insulating rod 17' so as to have an insulating distance that can withstand the voltage shared by the resistance ratio of the insulating rod 17', the amount of support can be ensured even when the insulating rod 17' is turned on.

The left end of the insulating pipe 18 is fixedly supported by the resistance drive link mechanism.

Since one short resistor 16b has no acting force when it is turned on, it is sufficient to hold it by the conductor 21 and the metal fitting 22.

In other embodiments, the right end of the insulating pipe 18 may be fixed to and supported by the conductor 3 using a metal fitting.

When dividing the closing resistor 16, the other end of the resistor 16a having the fixed resistance contact 15 is electrically insulated and supported on the conductor 3, so that the fixed contact 11 of the breaker 4 The innovidance of the resistor 16b whose one end is connected to the side is made smaller than the innovidance of the resistor 16a; for example, in a configuration in which resistive elements with the same resistance value are stacked, if the axial length of the resistor 16a is increased, the right end of the resistor 16a and the conductor are Since the voltage applied between the insulating rods 17' and the metal fittings 20 can be suppressed, the structure of the supporting and fixing device consisting of the insulating rods 17' and the metal fittings 20 can be simplified.

〔Effect of the invention〕

As described above, according to the present invention, since the resistor of the closing resistor device 5 is divided into two parts, it is possible to reduce the axial length of the conductor 3 etc. that supports the fixed contact 11 of the breaker part 4.
A grounded tank type gas breaker with a small size in the axial length of the entire breaker is obtained.

Moreover, the resistors are a long resistor 16a and a short resistor 16.
Divide the long resistor 16a into resistor contact 12.1.
Since the short resistor 16b is provided on the back side of the conductor 22 to which the fixed contact 11 is fixed, a grounded tank type gas breaker with a reduced diameter of the shield tube 23 can be obtained.

[Brief explanation of drawings]

Fig. 1 is a partial longitudinal sectional view showing an embodiment of the grounded tank type gas breaker according to the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a line - - - of Fig. 1. FIG. 1...Tank, 3...Conductor, 4...
...Shutoff part, 5... Closing resistance device, 6...
...Voltage sharing connector, 12...Movable resistance contact, 15...Fixed resistance contact, 16a, 1
6b... Closing resistor, 23... Shield tube.

Claims (1)

[Claims] 1 A cylindrical tank filled with an insulating gas is provided with a breaking section having a movable contact and a fixed contact, and a closing resistance device electrically connected in parallel with the breaking section, and this closing resistance device is connected to the movable In a grounded tank type gas breaker having a movable resistance contact electrically connected to the contact side, and a closing resistor having one end electrically connected to the fixed contact side and having a fixed resistance contact at the other end. , the closing resistor is formed by electrically connecting two closing resistors with different axial lengths in series, and the longer closing resistor has the fixed resistance contact at one end, and connects both of the resistance contacts. The shorter closing resistor is installed on a different axis and on the back side of the conductor that supports and fixes the fixed contact, and the shorter closing resistor is supported and fixed to the conductor. A grounded shield type gas breaker, characterized in that a shield tube is provided to surround the outer periphery of the closing resistor and the breaker section.