JPH01253187A - Separation device for lightning arrester - Google Patents

Abstract

PURPOSE:To make the total size of device compact in the vertical direction by providing a reactre between a fuse line and a power supply wire in parallel to a movable conductor without the direct connection to a lightning arrester, thereby making a disengaging part compact. CONSTITUTION:An upper end of a lightning arrester 1 is fixed to an iron tower arm while it is apart form an insulator of a power supplying wire 9 at a speci fied insulation distance. A separation member 7 is connected to a lower end of a lightning arrester 1, and from the lower part, a movable conductor 15 and a conductor 2a are lead out. One end of the conductor 15 is rotatably or horizontally supported at a support mechanism 19. The lead wire 2a forms a reactre 2 and connected to one end of the conductor 15. When the lightning arrester 1 is in malfunction under such constitution, a current flows in the wire, metal fittings 20, support mechanism 19, reactre 2, insulation plate 16 and fuse wire 5. Arcs are generated when the wire 5 is fused this current and a disconnection member 6 is separated by a spring 21, thereby the conductor is separated from the lightning arrester 1 by its own weight.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a lightning arrester disconnection device that disconnects a lightning arrester from an electrical circuit when the surge arrester fails.

[Prior art] Fig. 4, Fig. 5, Fig. 6, and Fig. 7 are, for example,
The lower part of the lightning arrester (1) connected to the arm (13) of the steel tower by the support fitting (13a) shown in Fig. 6 shows the conventional lightning arrester disconnection device shown in Japanese Patent No. 5-95284. As shown in FIG. 11, a gap portion (4) having a reactor (2) and a gap (3) is formed. At the bottom of the gap part (4), there is a fusible wire (5) and a disconnection part (
6) is connected, and the disconnection part (7) is connected to the power transmission line (9) in FIG. 6 via a connecting member (8). The feed W1 line (9) is the suspension insulator for the feed lt line (1
Separately supported by 0). FIG. 5 is an equivalent circuit representing each of the above parts. However, lightning protection i! :1 (1) and the line suspension insulator (10) are expressed as capacitance.

Next, the operation will be explained. When the lightning arrester (1) receives a lightning impulse, for example due to a lightning strike on the power transmission line (9),
Due to its high frequency, the impedance of the reactor (2) is high, and the lightning impulse current does not flow through the fusible wire (5) but applies a voltage to the gap (3). Therefore, the lightning impulse current flows through the connection member (8) and the shunt I- (11) in FIG. 4 to the gap (3).

On the other hand, when there is an abnormality in the lightning arrester (1), a commercial frequency ground fault current flows from the power transmission line (9) to the arm (13), but since the frequency is low, the impedance of the reactor (2) is sufficiently low, so there is no ground fault. Current flows into the reactor (2) via the fusible wire (5). When the fusible wire (5) is fused due to the flow of ground fault current, an arc is generated in this part,
The pressure in the space inside the insulating cylinder (12) of the separation part (7) increases. The insulating tube (12) is then destroyed by the pressure increase in the space, and as a result, the lightning arrester (1) is quickly disconnected from the power transmission line (9). FIG. 7 shows the state after separation.

[Problem to be solved by the invention] In the conventional lightning arrester disconnection device as described above, the fusible wire (5
) is connected in series with the reactor (2) as lightning protection 5 (1
), the longer the length of the reactor (2), the larger the disconnection device connected to the J detonator (1) becomes. As the disconnection device becomes larger, the suspension position 1 of the power transmission line (9) relative to the arm (13) must be lowered, which makes it difficult to secure an insulation distance for the arm (not shown) further below, for example. There was an interstitial point.

This invention was made in order to solve the above-mentioned problem, and it miniaturizes the disconnection device to be connected to the lightning arrester.
In particular, the purpose is to reduce the size in the vertical direction and provide it.

[Means for Solving the Problems] A lightning arrester disconnection device according to the present invention is formed to include a gap portion and a fusible wire that are to be connected in parallel to each other between a feed line and a surge arrester, When the molten wire melts, the above power transmission line and! ! ! A disconnection part is provided to disconnect the lightning arrester, and the movable conductor releases the connection.The power transmission line and the lightning arrester are connected in series through the gap, and the fusible wire is connected in series. The power transmission line and the lightning arrester are connected by a reactor through the reactor.

[Function] The lightning arrester disconnection device according to the present invention is either a reactor that connects the power transmission line and the lightning arrester via a fusible wire in series, or it is located outside the disconnection part without being directly connected to the surge arrester, and is connected to the surge arrester. Acts to flow ground fault current in the event of an abnormality.

[Embodiment] Fig. 2 is a schematic diagram showing an embodiment of the present invention. In Fig. 0, the steel tower (14) has horizontally projecting arms (
13) in the vertical direction (only a portion is shown), and the transmission line (9) is supported at the lower end of the suspension insulator (10) for a power transmission line, whose upper end is fixed to the arm (13) and hangs down. has been done. Further, the arm (13) is provided with a lightning arrester 5 (1) while maintaining a predetermined insulation distance from the power transmission line suspension insulator (10).
) is fixed at the top. A separation part (7) is connected to the lower end of the lightning arrester (1), a movable conductor (15) and a conductor (2a) are led out from the lower part of the separation part (7), and one end of the movable conductor (15) is rotatably and substantially horizontally supported by a support mechanism (19) attached to the lower part of the power transmission line suspension insulator (lO). Further, the conducting wire (2a) forms a reactor (2) by being insulated and wound around the movable conductor (15), and is connected to the above-mentioned one end of the movable conductor (15). The reactor (2) is covered with a cover (18
) is covered by

FIG. 1 is an enlarged sectional view of the main part of FIG. 2. Power transmission line (9
), the lightning impulse current passes through the mounting bracket (20), the support Ia side (19) and the movable conductor (15), passes through the gap (3) in the cutout (7), and reaches the lightning arrester (
1) and the arm (13) and tower (14) in Figure 2.
flows to the earth through. Since the lightning impulse has a high frequency, the impedance of the reactor (2) becomes high,
Substantially blocks the flow of lightning impulse current. On the other hand, if the lightning arrester (1) fails and cannot maintain sufficient insulation against the normal power transmission voltage, the current will drop to 1 m (9
) from the installation fee! (20) and the support mechanism (19), the flow passes through the reactor (2), which has a low impedance for commercial frequencies, and passes through the insulating plate (16) at the bottom of the cut-off part (7). (2) and flows into the fusible wire (5) connected in series. This current further passes through the lightning arrester (1) and the arm (13) and tower (1) in Figure 2.
4) and becomes a ground fault current. When the fusible wire (5) is fused due to this ground fault current, an arc is generated in this part,
The pressure inside the separation section (7) increases. J6MN (12
) bursts when it cannot withstand this pressure, and the compression spring (
21), the disconnecting portion (6) is disconnected, and the movable conductor (15) rotates around the support atff (1q) due to its own weight and moves away from the lightning arrester (1). Therefore, the lightning arrester (1) is disconnected from the power transmission line (9) and the cause of the ground fault is removed. FIG. 3 shows the state of the cutting device after it has been separated in this manner.

In addition, in the above embodiment, a cutting and till device was described that utilizes the increase in internal pressure due to the arc generated when the fusible wire (5) melts, but the mechanical engagement increases when the fusible wire (5) melts. Remove the lock and remove the compression spring (21
) may be separated by release.

However, in the above embodiment, the support mechanism (1) for the movable conductor (15) is
9) is attached to the lower end of the suspension insulator (10) for the feed'@ wire at the cutout part (
7) are respectively provided at the lower end of the lightning arrester (1). I! They may be provided at the lower ends of the line suspension insulators.

[Effects of the Invention] As described above, according to the present invention, the reactor is not directly connected to the lightning arrester, but is provided between the fusible wire and the power transmission line in parallel with the movable conductor, so that the separation portion can be miniaturized. This has the effect of vertically downsizing the entire cutting device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a disconnection device for a lightning arrester according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a disconnection device for a surge arrester installed on a steel tower, and FIG. 4 is a sectional view showing the disconnection section of a conventional lightning arrester, FIG. 5 is an equivalent circuit diagram showing the disconnection device of a conventional lightning arrester, and FIG. 6 is a schematic diagram showing the state after the disconnection device operates. Conventional lightning arrester disconnection
FIG. 7 is a diagram showing the state after the disconnection device of a conventional lightning arrester is operated. In the figure, (1) is the lightning arrester 8: (, (2) is the reactor, (3) is the gap, (5) is the fusible wire, (7) is the disconnection part, (9) is the transmission line, and (15) is It is a movable conductor. The same reference numerals in each figure indicate the same or corresponding parts. Fig. 4 Fig. 5

Claims (1)

[Claims] (1) A disconnection formed between a power transmission line and a lightning arrester that includes a gap portion and a fusible wire that are to be connected in parallel with each other, and when the fusible wire is fused, the power transmission line and the lightning arrester are separated. a movable conductor that connects the power transmission line and the lightning arrester through the gap portion in series, and releases the connection by disconnecting the disconnection portion; and the power transmission line through the fusible wire in series. A lightning arrester disconnection device comprising a reactor that connects the lightning arrester and the lightning arrester.