JPS598291A - Starting gap unit - 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 starting gap device, the purpose of which is to improve insulation properties.

As is well known, the starting gap device N is used in series capacitor protection equipment, shock voltage generation equipment, and their ponds.
When the pressure exceeds a predetermined value, it immediately discharges and starts the equipment.

The requirements for series capacitors will be explained using an example of iFi equipment. Figure 1 shows an example of the direct air circuit (7, C1,
C2 is a series capacitor divided into two parts, the middle point P1 of which is connected to the connection point P2 between the current suppression resistance loss and the starting gap device PG via the starting circuit bushing 31 and the coupling resistance loss. 8 is a bypass switch, SL, and 82 is a switching device.

On the surface, a first main gap G connected in parallel to the series capacitor C1 is supported by a first gap Oa and an arc runner; It consists of a main gap G1 formed between the electrode and the main gap G1, and is housed in a box-shaped gap cubicle (Je1) having an ionized gas discharge hole W. The electrodes are insulated from the gap cubicle GC1 via a bushing B2, the other W tai together with one of the electrodes forming the main gap G1 ni said cubicle GC1.
installed directly on the (1) Reference numeral 1 is an insulating support insulator for the cubicle.

The main gap (÷') on the side of the series capacitor C2 is constructed in approximately the same manner, and in this example, the starting gear unit PG, the coupling resistor JL+, and the current suppressing resistor R2 are housed in the gear hub cubicle GCZ. are doing.

niI The gap length of each gap is Ga (Gb≦(h, G
2 has been selected. Further, the starting gap device PG is insulated and supported from the gap cubicle (JC2) by a support insulator (2).

At the time of a transmission/distribution line fault, the series capacitor vC1 due to fault current,
When an overvoltage is applied across the terminals of C2 and exceeds a predetermined value, the starting gap device PG is firstly discharged. This causes the main gap G1 to discharge, and then the main gap G
2 discharges. Furthermore, a circuit not shown detects the main gap (h 2 , 02) and rapidly closes the bypass switch S, thereby shunting the series capacitors C1, C2.

By kneading, the arc in each gap is extinguished, and the ionized gas caused by the arc is released from the exhaust hole W of the gap cubicle, and as time passes, the inside of the gear tube cubicle returns to its original clean atmospheric atmosphere.

By the way, from the point of view of power supply, in the event of a power transmission/distribution line fault, the series capacitors C1 and C4 may be reinserted into the line immediately after the main gap (h, Oz operation).

In such a case, the gear pif vehicle (jCl
, (in the gap 2, the discharge of ionized gas due to the discharge of the gap does not end, and the gas remains, reducing the insulation of the air insulation part.For this reason, conventionally, the starting gap device PG I installed an insulating cap to strengthen the insulation.

FIG. 2 shows this conventional device, in which electrodes 2.2 are placed facing each other in an insulating container 1 such as an insulator. Of course, the container 1 is filled with an insulating gas 6 such as 81゛6 gas or N2 gas having a predetermined discharge characteristic at a predetermined pressure, and both ends are sealed by end plates. In the figure, only the periphery of the upper end device 5 attached to the container 1 by the fastening mechanism 4 is shown. This end plate 5 has 11 marks (cap length adjustment of 2.2 m + I!
! A valve 7 for charging and exhausting gas into the container 1 is provided.

ni+Note-1 Part of the area including the end plate 5 is covered with an insulating cap 8 with a bottom. The cap 8 is fixed with an insulating bolt 9 to a hole t1f provided on the side surface of the upper end plate 5 through a mounting hole. However, 1. ') - The metal bolt 11 is used only at the connection terminal of the electric wire 10.

Therefore, as described in 0i■, when the series capacitors C1 and C2 are reinserted into the line immediately after the operation of the main gap (h, (J2), the upper end plate 5 of the starting gap device PG and the cap cubicle ( Although the dielectric strength is reapplied between the JOZ, there is a drawback in terms of dielectric strength that there is a weak point in the path through the insulation cap mounting bolt hole.

Therefore, in the case where the starting cap device is installed in the gear hub cubicle as described above, a minimum distance of one insulation distance between the starting cap device and the gap cubicle is regulated. That is, the size of the cap cubicle must be increased from the point of view of insulation.

In view of the two points, the present invention changes the structure of the insulation-only jack and eliminates the weak point of insulation.

The present invention will be described and explained below based on FIGS. 6 to 5.

In FIG. 6, a female threaded (or male threaded) block 12 is provided inside the insulating cap 8, and a male threaded (or female threaded) block 13 is provided on the outside of the end plate 5 at F, r, respectively. ing. Both blocks 12 and 13 are starting gap devices, which can be attached and detached by rotating around the center line of the starting gap device (ru). Note that 14 is a spring seat interposed between the image blocks 12 and 16.

When the screws gls of both blocks 12 and 16 are screwed together, the periphery including a portion of the end plate 5 is covered by the insulating cap 8 as shown in FIG.

Note that an insulated 7N wire is used as the lead wire 10, which is connected using one of the fasteners 4 for fastening the upper end plate 5 to the insulating container 1, and led out from the opening of the insulating cap 8. Therefore, the upper end plate 4 and the live parts around it are covered with the insulating cap 8. This eliminates the need for insulating cap mounting bolt holes, eliminating weak points in the insulator.

FIG. 5 shows an example of a stand in which the gap length adjustment mechanism 6 and the gas charging/exhausting valve 7 are placed on the lower end plate (not shown) side.

Note that the screw block 126 described in iii. may be constructed integrally with the insulating cap 8 or the L-portion end plate 5.

The above explanation describes the case where the starting gap device is used as a protection device for a series capacitor.1. It goes without saying that the present invention can be applied in the same way when the tco is used for other equipment.

As described in detail above, according to the present invention, opposing blocks are provided on the inside of the insulating cap and on the outside of the upper end plate, respectively, so that the insulating cap and the upper end plate are rotated. Therefore, the through hole for attaching the insulation cap, which was a weak point in insulation, can be omitted. Further, the upper end plate and the live parts around it are all surrounded by an insulating cap without a through hole on the side surface, which has the advantage of improving the voltage drop performance.

Note that when the starting gap device is housed in the cap cubicle, the insulation performance between the upper end plate and the gear tube cubicle can be improved, and the gap cubicle can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a 1rt air line diagram showing an example of a direct +11 capacitor 1 (1 protection equipment), and Fig. 2 is a cross section showing a part of a conventional device (jel, uC2: Gyazo cubicle PG: starting gap device 1 : Insulating container 2: Electrode 5° insulating gas 5° top 71] Rising plate 8: Insulating cap 12.16: Screw block Patent applicant Nissin Electric Co., Ltd. 1 Figure W -6?, a 5a -I . A Z category θ Yoi 3 Figure O 4 Zuga 5 Figure

Claims (1)

[Claims] The counter electrode is housed in an insulating container filled with insulating gas, and
Both ends of the container are sealed with a lower end plate and
1f. The device is provided with an insulating cap that covers the circumference of the upper end plate including the upper end plate, one of which is fixed to the outside of the upper end plate, and the other is fixed to the inner side of the insulating cap, and the center of the device is fixed. A starting gap device comprising a block that allows the insulating cap to be attached to and removed from the upper end plate by rotating around a line.