JPS5894724A - 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 disconnect switch, and more particularly, to a disconnect switch with a resistor suitable for suppressing switching surges for use in SF, gas-insulated closed substations.

As a method for suppressing switching surges in a disconnector, a resistor-equipped disconnector has been devised that opens and closes via a resistor when the disconnector is opened and closed. FIG. 1 shows one of its structures, and FIG. 2 shows several circuits showing its operation process. Ground tank 1
A main contact consisting of a fixed electrode 2 and a movable electrode 3 is arranged inside,
A resistor 4 is provided around a fixed electrode 2. When the electrodes are opened, the fixed electrode 2 and the movable electrode 3 are first separated, as shown in Fig. 2b.
), a circuit is formed via the resistor 4, and then the electrode 5 and the movable pole 3 are separated and disconnected (Fig. 2C).
) structure. In this way, the opening and closing process is performed via a resistor, which has the effect of significantly reducing surge voltage even when restarting.

However, in a conventional disconnector without a resistor, the separation distance of the mover is as shown in FIG.

However, in this structure, since a resistor is added, the length becomes L+-(>Lo). For this reason, the operating mechanism section must be made larger, which is a drawback in gas-insulated equipment where miniaturization is desired.

An object of the present invention is to provide a disconnector with a gas insulated resistor that reduces the separation distance of the movable electrodes, which is a drawback of the above structure, and does not impair the switching surge suppressing effect.

In the above-mentioned structure, since the two contacts are opened and closed by the same movable electrode, it was necessary to move the sum of the insulation distance of the resistor section and the interpole distance of the disconnection section.

The present invention attempts to shorten the movable distance to approximately 50 inches by separating this into two parts.

An embodiment of the present invention will be explained with reference to FIG.

In the ground tank 1, a main contact point consisting of a fixed electrode 22 and a movable electrode 32, an auxiliary contact consisting of a fixed electrode 21, a movable electrode 31, and a resistor 4 arranged around it are arranged in series.
It shows the open state of a contact-configured disconnector. Movable electrode 3
1.32 has a structure in which they are operated simultaneously via a link mechanism, an operating rod 21, a link 22, and an operating rod 23 located inside the movable electrode storage section 9. The movable electrode housing portion 9 is insulated and supported from the ground tank 1 by an insulating support cylinder.

The basic opening and closing operations in this structure will be explained with reference to FIG.

When the opening/closing operation starts in the closed state (a), first the auxiliary contact composed of the fixed electrode 21 and the movable electrode 31 starts opening/closing (b). In other words, a resistor is inserted into the circuit. After this, the main contact made up of the fixed electrode 22 and the movable electrode 32 opens and disconnects, completing the disconnection (C). In such an operating process, it is necessary to create a difference in opening time between the main contact and the auxiliary contact. This relationship will be described with reference to the embodiment shown in FIG.

Minimum insulation distance for main contacts and minimum insulation distance L for auxiliary contacts
The relationship between R is LR>LM. Additionally, a wipe length is provided on the main contact side. That is, the auxiliary contact 21.
Even if 31 starts to open, main contacts 22 and 23 are wiped LW.
In order to maintain the open/closed state, the main contact opens after the auxiliary contact has sufficiently recovered its insulation.

FIG. 5 shows the opening time characteristics of both contacts. The most ideal case for the opening time of the main contacts is (
a). In this case, the insulation recovery voltage vR of the auxiliary contact
is more than twice the normal ground voltage peak value E (tl
) when the main contact is opened. Note that, as shown in (b), even if the main contact is opened at the time (t2) when vR of the auxiliary contact reaches E, a sufficient surge suppression effect due to restriking can be obtained. On the other hand, as shown in (C), it is also possible to open the main contact first. In this case, after the time (t4) when the main contact's vR reaches E, the auxiliary contact's VR changes to the main contact's vR.
It must be configured so that it exceeds that. This method requires a method of rapidly opening the auxiliary contact using a hook mechanism or the like at time t3.

As described above, with this structure, the separation distance of the movable electrodes can be reduced to approximately half that of the conventional structure, and the operating mechanism section can be downsized. Furthermore, in the conventional structure, the resistor is supported and fixed in a cantilevered manner, resulting in a mechanically weak structure, but in this structure, both ends are supported, which improves the reliability of the resistor.

Next, an embodiment of the present invention will be shown. 6 and 7 show modified examples of the auxiliary contact portion shown in FIG. 3. The disconnector has the duty of interrupting the flow of charge as described above, as well as the duty of interrupting the loop current. Since the loop current is equivalent to a maximum of 12 kA, some kind of arc extinguishing device is required for breaking the loop. In the case of the two-point disconnector of the present invention, this is cut off by an auxiliary contact. FIG. 6 shows the closed state of an example of an auxiliary contact equipped with an arc extinguishing device, and the difference from FIG.
There is '' at the point where 1 is attached. FIG. 7 shows the process of breaking this contact. The arc 50 generated when the loop current is cut off is cooled by the small insulating gap formed by the insulating nozzle 40 and the insulating rod 41, and at the same time, the blowing of high temperature gas has an effect, so it can be easily cut off. becomes.

When the loop current is cut off, the recovery voltage is about a few hundred volts, so it can be cut off using only the auxiliary contact, and there is no need to provide an arc extinguisher at the main contact. In this modification, an arc extinguishing device using a small gap in the insulator is shown, but an arc extinguishing device using an equal buffer mechanism for gas suction or blowing is also applicable.

Normally, in a single-point disconnect switch, the installation of an arc extinguishing device complicates the structure and becomes a weak point in terms of insulation performance, but according to this proposal, the main contact that maintains the insulation between poles is extremely simple. This improves insulation reliability.

Other embodiments of the present invention will be described using FIGS. 8 to 10.

In FIG. 8, the L portion of the gas bus line is composed of a vertical portion 61 and a horizontal portion 62, a main contact 63 similar to a conventional disconnector is arranged in the vertical portion 61, and a switching surge suppressor 64 is provided in the horizontal portion 62. are arranged and connected to the center conductor 65 and 66, respectively.

The main contacts 63 are the stator side shield 67, the movable element 68, the movable element side shield 69 that encloses the high voltage side operating section, the insulated support tube 70, the insulated operating rod (not shown), and the operating mechanism section 71
It is composed of - The opening/closing surge suppressor 64 is connected to the mover side shield 69, and the auxiliary contacts of the opening/closing surge suppressor 64 are operated by the operating mechanism section 73 via the insulated operating rod 72.

The opening/closing surge suppressor 64 has a structure as shown in FIG. 9, in which an auxiliary contact 80 and a resistor 81 are arranged in parallel and concentrically. The auxiliary contact 80 has a stator 82 and a mover 83
In FIG. 9, the open state is shown, and in the closed state, the tip of the movable element 83 is in contact with the stator tulip contact as shown by the dotted line.

The resistor 81 is cylindrical here, and has a resistance of 100 to 100
It is selected in the region of 00Ω. The resistor 81 may be an inner rod or an assembly of inner rods.

The mover 83 is moved by the insulated operating rod 72 as shown by the arrow.
It is moved and opened.

The operating principle is the same as that of the previous embodiment shown in FIG.

As shown in FIG. 8, according to an embodiment of the present invention, the main contact 6
3 and the opening/closing surge suppressor control section 64 can be divided using the gas bus rail section, which has the effect that each movable strip can be made equivalent to a conventional resistor-equipped disconnector. Since the resistor can be connected to the auxiliary contact arranged in series and parallel to the main contact, there is an effect of suppressing the switching surge voltage when the disconnector is re-ignited.

Although not shown, the present invention can also be applied to the horizontal and vertical parts of the '1' branch of the gas bus.

FIG. 10 shows a modification of the opening/closing surge suppressor.

The resistor 90 is arranged on the central axis, and the auxiliary contacts 91 are composed of cylindrical contacts 92 and 93. Contact 93 is the movable side. In this modification, the auxiliary contact 91
The contact 93 surrounds the resistor 90 in a closed steady state, which has the effect of increasing insulation reliability.

The embodiment shown in FIG. 8 can also be operated by one operating device like the embodiment shown in FIG.

According to the present invention, the distance i between the movable electrodes can be shortened to the equivalent of 50 inches in the conventional art, so the operating mechanical section can also be reduced in almost the same way. Furthermore, the effect of suppressing opening/closing surges is sufficient, and the diameter of the grounded tank can be reduced, and at the same time, the reliability of the control circuit and the like is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a disconnector according to the latest technology, FIG. 2 is an equivalent circuit diagram showing the first operation process, FIG. 3 is a sectional view of a disconnector according to an embodiment of the present invention, and FIG. 4 is a sectional view of a disconnector according to an embodiment of the present invention. An equivalent circuit diagram showing the third operation process, FIG. 5 is a characteristic diagram showing contact insulation recovery characteristics, FIGS. 6 and 7 are detailed sectional views of main parts of a disconnector according to another embodiment of the present invention, and FIG. 8 9 is a partial cross-sectional view of a disconnector according to another embodiment, and FIGS. 9 and 10 are cross-sectional views of main parts showing different configuration examples of the main parts in FIG. 8. 1... Grounded tank, 2, 21.22... Fixed electrode,
3゜31.32...Movable electrode, 4...Resistor, 2o
...Insulating support tube, 21.23...Operation rod, 4o
...Insulating nozzle, 41...Insulating rod, 5o...Arc. Figure 3

Claims (1)

[Claims] 1. In a disconnector in which a contact consisting of a fixed electrode and a movable electrode is arranged in a grounded tank to enable opening and closing of a circuit, two of the above contacts are arranged in series to form a main contact and an auxiliary contact. 1. A disconnector comprising a contact and a resistor provided in parallel between the auxiliary contacts, so that both contacts can be opened and closed by the same operating mechanism. 2. The disconnector according to claim 1, characterized in that the main contact opens after the auxiliary contact opens, and the auxiliary contact closes after the main contact closes. Disconnector. 3. The disconnector according to claim 1, wherein the opening speed of the auxiliary contact is faster than the opening speed of the main contact. 4. The disconnector according to claim 1, wherein the minimum insulation distance of the auxiliary contact portion is longer than the minimum insulation distance of the main contact portion. 5. The disconnector according to claim 1, characterized in that the auxiliary contact portion is provided with an arc extinguishing device.