JPS5811726B2 - Lightning arrester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightning arrester, and particularly to a lightning arrester that can be incorporated into a composite device such as a compact transformer.

Recent power substation equipment has been required to be more and more downsized due to land shortages, etc., and the reduced-sized transformer equipment that has appeared based on this demand for downsizing is a system that integrates the electrical equipment used therein. Built-in.

Before the substation device configured in this way is started to operate, a specified withstand voltage test is conducted based on the electrical equipment technical standards. At this time, the lightning arrester built into the complex equipment is Therefore, for this test, a disconnecting device is installed on the lightning arrester, and the disconnecting device is left open during the test to protect the lightning arrester from the electric strength test.

Conventionally, such disconnection devices include: (1) providing a disconnector between the lightning arrester and other equipment; (2) providing a disconnector between the lightning arrester and the connecting portion of other equipment as shown in Figure 1; Methods such as moving the entire lightning arrester to disconnect it are adopted.

These conventional devices use a general disconnector in case (1), which increases the price of the disconnector and is also disadvantageous in terms of space.

In addition, in the case of the method (■) shown in FIG. 1, a three-phase lightning arrester 21 is housed in a gas-filled tank 20, and the lightning arrester 21 is installed in the upper part of the tank 20. A disconnecting device 23 is provided between the spacer 24 and each lightning arrester 21.

This disconnecting device n is composed of a removable shield 25 and a conductor 26 that electrically connects the lightning arrester 21 and the ends.

In order to disconnect the circuit, the gas in the hermetically sealed tank 20 is first removed, the band hole 27 is removed, the hand is inserted into the tank 20, the shield 25 and the conductor 26 are removed, and the circuit is disconnected.

Therefore, in this method, since the airtight state is broken, it takes time to re-tighten the airtight state after the test, refill the insulating medium gas, etc., and the work requires inserting one's hand into the band hole 27. It has some disadvantages.

Particularly when the insulating medium is oil, it has the disadvantage that it requires more effort.

In addition, in method (2), since the disconnection device is composed of the lightning arrester and the connecting conductor, it takes up less space and has the advantage of being able to disconnect the disconnection without breaking the airtightness. has become more complex, and the work has become more difficult.

This invention was made with the aim of eliminating such drawbacks, and is characterized by the fact that between the cicada lightning arrester and the fixed electrode for connection to other equipment, which is provided opposite the lightning arrester, there is a A rod is provided for better operability, and the connection is disconnected by attaching and detaching the rod, and will be described in detail below with reference to the drawings.

FIG. 2 is a front view showing one embodiment of the present invention, and 1 is a container (
The insulating medium (gas or oil) is sealed in the tank (hereinafter referred to as tank).

2 is a mounting plate, which is attached to the opening at the top of tank 1;
A plurality of insulating rods 4, for example, six insulating rods 4 as shown in FIG. 3, are implanted in any part thereof to support the element body 3.

Note that FIG. 3 is a view taken along the line A-A in FIG. 2.

Reference numeral 5 denotes a line-side electrode of a lightning arrester fixedly attached to each insulating rod 4, and a hole 6 is bored approximately in the center thereof, and a ring contact 7 is attached thereto.

Reference numeral 8 denotes a supporting insulated pipe, and an operating rod 9 made of an insulating material is inserted through the pipe 8 so as to be vertically movable.

One end of the operating rod 9 is supported by a cap 10 attached to the tank 1 together with the mounting plate 2, and a movable electrode 11 is fixed to the other end of the operating rod 9.

That is, as shown in FIG. 3, on the upper surface of the line-side electrode 5 supported by the insulating rod 4, three elementary bodies 3 whose main component is zinc oxide are arranged with the insulating rod 4 and the insulating pipe 8 as guides. , as shown in FIG. 2, are stacked, and contact between the stacked elements 3 is maintained via springs 19.

Thus, the elements arranged in parallel are electrically connected in series to constitute a lightning arrester.

12 is an insulating seat, 13 is a conductor for leading out to the outside, and 14 is an O-ring for maintaining airtightness.

Further, 15 is an insulating insulator, which is disposed at a position facing the line-side electrode 5 of the lightning arrester, and has a fixed electrode 16 fixed to its tip.

A ring contact 17 into which the tip of the movable electrode 11 is inserted and a connecting conductor 18 to other equipment are attached to the fixed electrode 16.

The reason for arranging the element bodies 3 in parallel is as follows.

The composite equipment used in the compact transformer is housed in a tank 1 surrounded by conductors, so the internal potential distribution of the arrester is affected by stray capacitance between the grounded tank wall and the element body, making it uneven. becomes.

The elements 3 are arranged in parallel in order to reduce the influence of this stray capacitance and to shorten the length of the lightning arrester to make it more compact.

Therefore, if the above-mentioned point does not need to be taken into consideration, it goes without saying that the elements may be stacked in a single row.

FIG. 5 shows another embodiment.

The difference from the embodiment shown in FIG. 2 is that an insulating tube 30 is fixed to the mounting plate 2, oil or gas and a lightning arrester are sealed inside, and a fixed electrode 16 is supported by this insulating tube 30. The other aspects are the same as in FIG. 2.

Note that 31 is a shield and 32 is a seal.

The operation of the present invention constructed as described above will now be explained.

Normally, the operating rod 9 is in the state shown in FIG. 2, and the movable electrode 1
1 is inserted into the ring contact 17 on the fixed electrode side,
The line side electrode 5 and fixed electrode 16 of the lightning arrester are in a normal state.

Therefore, when a surge enters the transformer,
Connection conductor 18 → fixed electrode 16 → ring contact 17 →
Current flows along the route of movable electrode 11 → ring contact 7 → line side electrode 5 → element body 3 → external lead-out conductor 13 → ground, and electrical equipment in tank 1 (not shown) is protected by a lightning arrester.

Next, when performing a withstand voltage test on the substation, the operating rod 9 is pulled up in the direction of the arrow.

Then, the movable electrode 11 is pulled out from the ring contact 17, and as shown in FIG. 4, the fixed electrode 16 and the line-side electrode 5 of the lightning arrester are in an open state, and the lightning arrester is separated from other transformer equipment and protected from the withstand voltage test. Ru.

After the test is finished, by pressing down the operating rod 9, the movable electrode 11
is again applied to the ring contact 17, resulting in the state shown in FIG. 2, which protects the transformer from surges.

As described above, according to the present invention, the lightning arrester can be connected and disconnected by simply moving the operating rod up and down from outside the tank.

Therefore, it has advantages such as being compact in terms of space, being relatively inexpensive to manufacture, and being able to easily disconnect and disconnect without breaking airtightness.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view showing a conventional lightning arrester, Fig. 2 is a front view showing an embodiment of the present invention, and Fig. 3 is A of Fig. 2.
-A arrow view, FIG. 4 is a front view of a disconnection section for explanation, and FIG. 5 is a front view showing another embodiment. 1 is a container, 2 is a mounting plate, 3 is an element body, 4 is an insulating rod, 5 is a line side electrode, 9 is an operating rod, 11 is a movable electrode, 7, 17
is a ring contact, and 16 is a fixed electrode.

Claims (1)

[Claims] 1. In a case where a lightning arrester is housed in a container filled with an insulating medium, and this lightning arrester is separated from other electrical equipment of a substation, a mounting plate is attached to the container, and an insulating rod is attached to the mounting plate. A lightning arrester having a line-side electrode is installed through the lightning arrester, and a fixed electrode is provided at a position facing the line-side electrode of the lightning arrester at an arbitrary distance. 1. A lightning arrester characterized in that an operating iron is movably provided with a movable electrode for short-circuiting a line-side electrode and a fixed electrode of the lightning arrester.