JPS6051794B2 - Gap device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a gap device.

As is well known, the arc generated in the first gap for starting is guided to the second gap by an arc runner, where the arc is extended or rotated. One example is a protective gap device for series capacitors.

One side of this device will be explained based on FIGS. 1 and 2.

Cl and Co are series capacitors, the middle point P of which is connected to the connection point Po between the current suppression resistor R2 and the auxiliary gap PG via a coupling resistor R. BPS is a bypass switch, 51|52|53 is a switch, and L is a power transmission line. The main gaps G and G' connected in parallel to the series capacitors Cl and Co are, for example, a first gap G for starting consisting of first electrodes Ga and Gb as shown in FIG.
1 and second electrodes Ga2 and Gb2 supported by arc runners 1a and 1, which have a gap length larger than the first gap G. ,,, 1', 1 tsupu G.

The second electrode Ga is disposed above the second electrode Ga. and the third gap G. The third electrode Cl) forming the ionized gas discharge hole 2 is housed in a cubicle 3 having an ionized gas discharge hole 2. The one first electrode Gal is insulated from the cubicle 3 via a bushing 4, and the other first electrode Gal is connected to the cubicle 3 via a bushing 5 (or directly to the cubicle 3 (not shown). z)) installed.

Further, the third electrode Gb3 is supported by the cubicle 3 by an insulator 6, and is connected to the cubicle 3 via a conductor 7 extending laterally, and in the illustrated example, the third electrode Gb3 is connected to the cubicle 3 via the conductor 7, the cubicle 3, and the conductor 8. An electric circuit is formed by connecting the first electrode Gb of the first electrode Gb.

9 is a support for the conductor 7, 10 is an insulating frame, and 11 is an insulating support insulator.

Although FIG. 2 shows the main gap G on the series capacitor Cl side, the main gap G' on the series capacitor Co side has almost the same structure, and if necessary, an auxiliary gap PG may be provided in the cubicle 3). A coupling resistor R and a current suppressing resistor R2 are housed therein, and the main gaps G and G' may be arranged below the main gap G to have a two-tier structure to reduce the installation area.

The gap length of each gap is selected to be G, <G, both G3. Here, an overvoltage is applied between the terminals of series capacitors Cl and Co due to the short circuit current at the time of a transmission line fault, and when the voltage between the terminals of series capacitor C2 reaches the discharge starting voltage of auxiliary gap PG, this discharges and the coupling resistor The overvoltage is applied to the main gap G side via only.

In this main gap G, since the gap length of the first gap G1 is short, the arc first occurs here, and the current flows from the X-cubicle 3 to the conductor 8 to the first gap G1 to the bushing 4 to Y.

Therefore, the arc a1 generated in the first gap G1 is blown upward by the electromagnetic force of the first loop circuit 1, rises between the arc runners 1a and 1b, and reaches the second gap G2. When this elevated arc A2 further rises and reaches the third electrode Gb3, the current flows from X-cubicle 3 to conductor 7 to third gap G3 (third electrode Gb3) to arc A8 to second electrode Ga2) - arc runner 1a - L-th electrode Gal - bushing 4-Y. For this reason,
The arc A3 in the third gap G3 is blown to the right in the figure by the electromagnetic force of the second loop circuit (3), that is, as shown in the arc A4, and is extended toward the ionized gas discharge hole 2.
The ionized gas generated by the discharge is discharged outdoors through the ionized gas discharge hole 2.

Along with this discharge of the main gap G, the current suppressing resistor R2
Since the full voltage is applied to G, the other main gap G'' is similarly discharged, bypassing the series capacitors Cl and C2.

Subsequently, when the bypass switch BPS closes and the discharge in both main gaps G and G'' disappears, the cubicle 3
The ionized gas inside is quickly exhausted and insulation recovery is performed. By the way, in order to improve the running speed of the arc a1 in the aforementioned arc runners 1a and 1b and to improve the insulation recovery characteristics, as shown in FIG. Facing side 1a
It was previously proposed by the present inventors to cover the arc runners 1a and 1b with a ferromagnetic tube M provided with an interruption M1, leaving the arc runners 1 and 1b1. Note that T is a cover made of an arc-resistant insulator such as FRPl Teflon, and the arc is an arc runner! This prevents it from going around to the back side.
According to this configuration, the traveling speed of the arc a1 in the arc runners 1a and 1b is improved, but the arc a1 is
Moving on to electrodes Ga2 and Gb2? When traveling over this, there is a high probability that the traveling route will be bent as shown by the dots in Figure 13a, and in some cases the second electrode Ga2, G may be bent.
There is a drawback that the arc foot wraps around the back surface of b2, reaches the magnetic neutral point N, and stagnates. When this phenomenon occurs, the area around the arc runners 1a and 1b and the first gap G1 is filled with ionized gas, and the insulation recovery characteristics are poor. However, the inconvenience of re-discharging occurs due to the voltage between the two.

As a result of various studies, the present invention is based on the second electrode Ga2 or GY.
) It was found that the bend in the traveling path of the arc A2 on the ferromagnetic cylinder M was found to be on the ferromagnetic cylinder M. That is, when the ferromagnetic tube M is provided, as shown in FIG. 3, the magnetic flux φ is distributed in an upwardly convex shape when viewed from the surface facing the arc runner at its end. Therefore, the arc a1 moves onto the second electrode Ga2 and the arc A
2, the arc A2 is caused to run perpendicular to the magnetic flux φ, so that the arc A2 is gradually bent on the second electrode Ga2, reaches the side surface, and finally wraps around the back surface.

In view of the above points, the present invention provides a traveling path of an arc on the second electrode without deteriorating the electric field distribution by interposing a non-magnetic material between the ferromagnetic cylinder end and the second electrode. The purpose is to prevent bending.

The present invention will be explained below based on FIG.

In the figure, D is a non-magnetic cylinder made of copper, steel, aluminum, etc., and has an opening D1. It has approximately the same diameter as the ferromagnetic cylinder M, and the end portion and the second electrode Ga2, Gb
2 and covers the arc horns 1a and 1b. The cut-in D1 is aligned with the cut-in M1 of the ferromagnetic tube M, exposing the opposing surfaces 1a1 and 1b1 of the arc horns 1a and 1b. T is a cover made of arc-resistant insulator such as FRPl Teflon, and arc runners 1a and 1b
The ferromagnetic cylinder M1 commonly covers the non-magnetic cylinder D, leaving opposing surfaces 1a1 and 1b1. This cover T is double cylinder M
, D may be molded with an arc-resistant insulator. Therefore, in this configuration, the second electrodes Ga2, Gb2
In the above example, due to the long distance from the ferromagnetic cylinder M, the magnetic flux is somewhat weakened, and the direction of the magnetic field substantially coincides with the direction of the magnetic field on the opposing surfaces 1a1 and 1b1.

Therefore, when the arc a1 reaches the second electrodes Ga2 and Gb2, the arc? However, the running route is not bent so much, and the arc foot draws a trajectory similar to a dot mark, and avoids going around the back side of the arc A.
2 stagnation is prevented. Also, since the non-magnetic tube D is provided in contact with the ferromagnetic tube M, the arc horns 1a, 1
The shape of the electrode on the outer periphery of b is not deteriorated, and no problem occurs in terms of electric field distribution. Therefore, even if the series capacitors Cl and C2 are reinserted after recovery from the accident, the first gap G1 and between the arc runners 1a and 1b will not be re-discharged due to the voltage between the terminals.

Although the gap device for a series capacitor has been described above, it goes without saying that the present invention can be applied to any device having an arc extension electrode at the end of the arc runner.

As detailed above, according to the present invention, the traveling path of the arc bends on the arc extension electrode provided at the end of the arc horn without deteriorating the shape of the electrode on the outer periphery of the arc horn, causing the arc to stagnate. This has the effect of preventing this from happening.

[Brief explanation of the drawing]

Fig. 1 is an electrical diagram of the capacitor equipment, Fig. 2 is a schematic diagram of the gap device shown in Fig. 1, and Fig. 3 shows the main parts of a conventional gap device. , b is a sectional view taken along line b-b in FIG. 3, FIG. 4 shows the main parts of one embodiment of the present invention, and a is an enlarged view of one of the second electrodes and the arc horn; b is a perspective view of a ferromagnetic tube and a nonmagnetic tube. G1...First gap, Gal, Gbl...
...First electrode, G2...Second gap, Ga
2, Gl) 2... Second electrode, 1a, 1b...
...Arc runner, M...Ferromagnetic tube, D
・・・・・・Non-magnetic tube, 1,000... Arc-resistant insulating cover, φ... Magnetic flux.

Claims (1)

[Claims] 1 An arc runner connects the first electrode that forms the first gap for starting and the second electrode that forms the second gap for arc extension, and connects this arc runner with a ferromagnetic tube, leaving opposing surfaces. In the covering, a non-magnetic cylinder with an exposed surface of the arc runner is interposed between the ferromagnetic cylinder and the second electrode, and the outside of the ferromagnetic cylinder and the non-magnetic cylinder are arc-resistant. A gap device covered with an insulating cover.