JPH019062Y2 - - Google Patents

Description

[Detailed description of the invention] This invention improves the protection effect against abnormal voltage by housing the lightning arrester for the special high-pressure gas switch in the bushing of the gas switch, and also significantly simplifies and saves the wiring work for installing the lightning arrester. The purpose of this is to prevent deterioration and damage to the lightning arrester. Conventionally, lightning arresters used as lightning damage protection devices for special high-voltage distribution lines, etc., are usually installed individually near the installation point of the gas switch via lead wires in order to protect the gas switch. It is. With this kind of arrangement, the voltage drop in the lead wire due to the lightning discharge current is added to the voltage limit when the arrester is activated, so cases often occur where the abnormal voltage received by the switch exceeds its insulation strength and causes an accident. ing. Therefore, in order to expect more effective protection, it is desirable to install the lightning arrester as close as possible to the switch. In addition, in conventional lightning arrester installation work, the wiring of the track side lead wire and the grounding side lead wire for the switch is complicated, which requires a considerable amount of labor and time.In addition, according to past investigations, this type of lightning arrester absorbs moisture. Accidents often occur due to broken lead wires, soiling, damage caused by blows during construction, etc. The present invention eliminates the above-mentioned conventional defects and provides a more excellent special high pressure gas switch with lightning arrester.

The present invention will be explained with reference to the drawings. FIG. 1 is a partial vertical sectional side view of the special high pressure gas switch of the present invention which accommodates a gear press arrester, and FIG. 2 is a schematic diagram of the connections of the gas switch. In the figure, 1 is the gas-filled body of the special high-pressure gas switch, and 2 is the hanging bolt 3.
The arm arm 4 is connected to the handle 5 of the external opening/closing operation mechanism, and the interlocking shafts 6, 6, 6 are opening/closing contacts (movable contacts) for each phase, and the grounding point 7 is a grounding conductor.
On the left and right sides of the switch main body 1, phase bushings 8, 8, which are air insulators and are relatively long from the standpoint of contamination, withstand voltage, lightning surges, etc., are attached to pedestals 9, 9, and connected to the main body 1. An insulated wire 10 is fixed to the outer end of each bushing 8 with a rubber cone 11, and a fixed electrode 12 is fixedly connected to the outer end of each bushing 8.
A fixed contact piece 12' branches out inward from the bushing 2, and a fixed electrode bar 13 branches out from one of the left contact pieces 12', and a movable electrode bar 14 branches out from the other right contact piece 12'. The tube contact 14' at the tip of the movable side and the contact 13' at the tip of the stationary side are brought into fitting contact with each other or released and separated by the rotation of the interlocking shaft 4 that connects to the external operation handle 5 described above. It was designed to do something like this. The above structure has been conventionally used.

In this case, a resin flange 16 is attached to the connecting port 15 of the comparatively long phase bushings 8, 8 opening into the switch main body 1 in the above-mentioned special high pressure gas switch.
Attach the bolt 17 to the flange 16 and attach the electrode rod 13,
The movable electrode rod 14 is provided with 14 supporting parts 18, 18.
The supporting portion 18 is made slidable, and a connecting fitting 1 is attached to one point of the flange 16, for example, the upper inner surface of the flange 16.
A gear press lightning arrester 21 in which several ZNO (zinc oxide) elements etc. are inserted in series in an insulating cylinder 20 is placed horizontally in the inner space of each bushing 8 formed in this way. In addition, a flap-shaped current collecting metal fitting 22 is slidably fitted to each of the left and right fixed contact pieces 12', and a spiral spring 23 is inserted into each current collecting metal fitting 22 to push the current collecting metal fitting 22. By pressing the rear end part 24 of the gear press lightning arrester 21 with the tip flap piece 22', the tip part 25 is brought into pressure contact with the inner end surface of the above-mentioned connecting fitting 19. As shown in the figure, they are connected by a connecting wire 26 disposed within the main body 1 and grounded via a grounding conductor 7.

The resin flange 16 is formed into a circular shape to seal the connecting port 15 of the bushing, and several gas through holes 27 are provided on the surface of the flange 16 to introduce the main body gas into the bushing 8 to make the bushing 8 gas insulated. The movable electrode rod 14 is provided with a piston 28 in the support part 18, and a gas passage hole 29 is penetrated from this part to the tip tip contact 14' and opened on the back surface of the piston. When opening ', 14', the gas on the back surface of the piston may be jetted out through the gas passage hole 29 to improve the arc extinguishing effect.

30 is a spring for tightening the current collector fitting 22; 31
is an O-ring, and 32 is a Patsukin. Connecting line 2
6 is already incorporated into the main body 1, but is omitted from illustration.

The bushing 8 of the gas switch for extra high pressure is relatively long as described above, and the inner space thereof is also relatively long, but there is no one yet that has effectively utilized this inner space. In this case, a gear press lightning arrester 21 in which ZNO elements etc. are inserted in series is placed horizontally using the inner space of this bushing, and is pressed with a rear flap-like current collector 22, and the tip of the arrester is attached to a resin flange 16.
Since all of these connecting fittings 19 are connected by pressure contact with the connecting fittings 19 provided in the connecting fittings 19 and connected to the grounding conductor 7 to be grounded, the following particularly remarkable effects are produced.

That is, since a lightning arrester with a Zno element inserted therein is built into the bushing of the switch itself, the extra high voltage switch equipped with a lightning arrester can be extremely miniaturized and the cost can be significantly reduced.

This Zno element inserted lightning arrester becomes a gear press lightning arrester, which not only protects electrical facilities such as switches from abnormal voltages caused by lightning surges, but also cuts off the following current in a short period of time, significantly improving the protection effect against lightning surges. .

Conventionally, when installing a lightning arrester on a switch, installation work such as line side lead wires and ground side wiring was complicated and required a lot of effort and time, but with this project, such installation work is not required at all. First, since the lightning arrester is built directly into the bushing, the installation work can be extremely simplified and labor-saving.

It is possible to provide a safe and effective lightning arrester that does not cause accidents such as moisture absorption, breakage of lead wires, staining, damage during construction, etc., as in conventional lightning arresters.

It is possible to provide a switch with a lightning arrester that simplifies the surroundings of the switch and is in good harmony with the local environment.

[Brief explanation of the drawing]

Attached FIG. 1 is a partial longitudinal sectional side view of the special high pressure gas switch housing the capacitive arrester according to the present invention, and FIG. 2 is a schematic diagram of the wiring of the special high voltage switch equipped with the lightning arrester. 1... Switch main body, 4... Interlocking shaft, 5...
...Externally operated handle, 6...Movable contact, 7...
Grounding conductor, 8... Bushing, 12... Fixed electrode, 12'... Fixed contact piece, 13... Fixed electrode rod,
14... Movable electrode rod, 15... Inner connection port of bushing, 16... Resin flange, 19... Connecting fitting, 20... Insulating tube, 21... Gear press arrester, 22... Laptop-shaped current collector fitting, 22'... Lapple piece, 23... Helical spring, 26... Connecting wire disposed inside the main body, 27... Gas through hole, 28...
...Piston, 29...Gas vent.

Claims (1)

[Scope of utility model registration request] A resin flange 16 is attached to the connection port 15 that the bushing 8 of the special high voltage switch opens to the main body 1, and the fixed electrode rod 13 and the movable electrode rod 14 are connected by the flange 16.
A connecting fitting 19 is attached to the inner surface of each flange 16, and the connecting metal fitting 19 is inserted into the inner space of each bushing 8, and several Zno elements etc. are inserted into the insulating tube 20 into the inner space of each bushing 8. The gear press lightning arrester 21 is placed horizontally, and a latch-shaped current collector fitting 22 is fitted to each of the left and right fixed contact pieces 12', and a spring 23 is inserted into the current collector fitting 22, and the latch piece 22' at the tip of the current collector fitting is inserted. Press the rear end of the lightning arrester 21 to bring the tip into pressure contact with the inner end surface of the connecting fitting 19, and connect all the connecting fittings 19, 19, 19... to the connecting wire 2 disposed inside the main body.
A special high-pressure gas switch housing a gear press lightning arrester connected at 6 and grounded via a grounding conductor 7.