JPH04106768U - High voltage insulator and leakage current stop circuit - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] A high voltage insulator that can easily detect leakage current, and a leakage current stop circuit using the same [Configuration] Under normal conditions, one wiring attachment member of the high voltage insulator 1 The high-voltage busbar attached to 12 and the ground wire attached to the other wiring attachment member 13 are insulated by the insulator 11, and the conductive band 2 and current detection terminal 3 have no effect. However, in the event of an abnormality, for example, when dielectric breakdown occurs, a leakage current flows from one wiring attachment member 12 to the conductive band 2 via the side surface of the insulator 11. This leakage current is temporarily accumulated in the conductive band 2 before flowing toward the other wiring attachment member 13, but at that time, from this conductive band 2 to the current detection terminal 3.
guided by. When the current detector 4 detects a leakage current from the current detection terminal 3, a current detection signal is transmitted to the voltage cutoff circuit 5, and the voltage supplied to the high voltage bus is cut off. This stops leakage current.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on the structure of high-voltage insulators used in switchboards, etc. that have high-voltage busbars. Also, if a leakage current is detected that flows when the high voltage insulator is abnormal, it should be immediately taken care of. This invention relates to a leakage current stop circuit that stops.

0002

[Conventional technology]

In switchboards that house high-voltage equipment, high-voltage insulators are used to support high-voltage busbars. Children are often used. Figure 2 shows the structure of this type of general high voltage insulator 10. Wiring attachment members 12 and 13 are provided at both ends of the insulator 11, respectively, and are not used normally. Sometimes a high voltage busbar is attached to one wiring attachment member 12 and the other wiring A grounding wire is attached to the attachment member 13.

0003

[Problem that the idea aims to solve]

By the way, since switchboards are often installed outdoors, dust may adhere to the insulator surface. The surface resistance may decrease depending on the wet state. leave these alone During use, dielectric breakdown occurs and an excessive leakage current flows on the surface of the high voltage insulator 10. . In order to prevent damage to the switchboard and installed equipment due to this leakage current, conventional high voltage The surface of the insulator 10 is constantly monitored, and if the surface is contaminated, the power supply is stopped and cleaned. It was necessary to clean up.

0004 However, it is difficult to constantly monitor the high voltage insulator 10, and In many cases, it is not possible to frequently shut off power to electrical panels and equipment.

[0005] This invention was devised in view of these issues, and its purpose is to We provide high-voltage insulators with a structure that allows easy detection of leakage current when it flows. At the same time, when the leakage current flowing on the surface of the high voltage insulator is detected. The object of the present invention is to provide a leakage current stopping circuit that immediately stops this leakage current.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention provides wiring attachment members at both ends of the insulator. a high-voltage insulator with a high-voltage busbar attached to one wiring attachment member, In the case where the ground wire is attached to the other wiring attachment member, the other wiring The insulation state between the wire mounting member and the one wire mounting member when the wire mounting member is not in contact with the wire mounting member and is normal. A conductive band is wound around a part that can hold the conductive band, and a current detection end is connected to the conductive band. A conductive band is provided from the one wiring attachment member through the side surface of the insulator in the event of an abnormality. It is characterized by having a structure that allows leakage current flowing through the terminal to be guided to the current detection terminal.

[0007] Further, the present invention provides the high voltage insulator and the electric current provided in the high voltage insulator. Current detection occurs when electrically connected to the detection terminal and current is detected from the current detection terminal. a current detector that outputs a signal; and a current detector that outputs a signal, and when receiving the current detection signal, A leakage current stop circuit is constructed by providing a voltage cutoff circuit that cuts off the supplied voltage. It is characterized by

[0008]

[Effect]

During normal operation, the high voltage busbar attached to one wiring mounting member and the other wiring mounting member The ground wire attached to the The output terminal has no effect. However, in the event of an abnormality, such as when dielectric breakdown occurs, one side Leakage current flows from the wiring attachment member to the conductive band through the side surface of the insulator. This leakage current The current temporarily accumulates on the conductive band before flowing toward the other wiring attachment member, but at that time , is led from this conductive band to the current detection terminal.

[0009] When the current detector detects leakage current from the current detection terminal, the current detection signal changes to voltage. The voltage sent to the cutoff circuit and supplied to the high voltage bus is cut off. This results in high pressure Leakage current flowing from the busbar stops.

0010

【Example】 Embodiments of the present invention will be described below with reference to the drawings. In addition, the high pressure used in this invention The insulator is an improved version of the conventional high-voltage insulator, so it has the same structure as the conventional one. Components will be explained using the same reference numerals.

[0011] Figure 1 shows the structure of a high-voltage insulator according to an embodiment of the present invention and the use of this high-voltage insulator. FIG. 2 is a diagram showing a schematic configuration of a leakage current stop circuit. In Figure 1, 1 is high voltage insulation Indicates an insulator. This high-voltage insulator 1 is connected to the other wiring attachment part to which the grounding wire is attached. One wiring installation that does not come into contact with material 13 and that has a high voltage busbar installed under normal conditions. A portion that can maintain an insulating state between it and the member 12, for example, on the side surface of the insulator 11. The conductive band 2 is wound around the other wiring attachment part 13, and the conductive band 2 and A current detection terminal 3 that conducts is provided, and is insulated from the one wiring mounting member 12 in the event of an abnormality. Structure capable of guiding leakage current flowing into the conductive band 2 through the side surface of the body 11 to the current detection terminal 3 That is.

0012 Further, 4 indicates a general-purpose current detector (ZCT). One end of this current detector 4 is It is electrically connected to the current detection terminal 3 of the piezoelectric insulator 1, and the other end is kept at zero potential, for example. When leakage current is detected from current detection terminal 3, a current detection signal is output. so that

[0013] Furthermore, 5 is a protective relay circuit (Ry) constituting a voltage cutoff circuit, and is a current detection circuit. When output device 4 outputs a current detection signal, it is received and the high voltage bus (not shown) The system is designed to cut off the power supply.

[0014] With the above configuration, the leakage current stop circuit according to this embodiment will normally only connect to one of the wirings. The high voltage busbar attached to the mounting member 12 and the other wire mounting member 13 The conductive band 2 and the current detection terminal are insulated by an insulator 11. 3 has no effect. However, when abnormalities occur, such as insulation deterioration or breakdown, If so, current leaks from one wiring mounting member 12 to the conductive band 2 through the side surface of the insulator 11. The flow flows. This leakage current is conducted before flowing into the other wiring attachment member 13. It is temporarily accumulated in the conductive band 2, but at that time, it is led from the conductive band 2 to the current detection terminal 3. Ru.

[0015] When the current detector 4 detects leakage current from the current detection terminal 3, the current detection signal is The voltage transmitted to the protection relay circuit 5 and supplied to the high voltage bus is immediately cut off. This stops leakage current and prevents damage to the switchboard and housed equipment.

[0016]

[Effect of the idea]

As is clear from the above explanation, according to the present invention, when leakage current flows, It is possible to provide a high-voltage insulator with a structure that allows easy detection of If a leakage current flows through the surface of a high-voltage insulator, it will be detected and immediately A leakage current stopping circuit capable of stopping leakage current can be provided.

[0017] This eliminates the need to constantly monitor high-voltage insulators as in the past. Therefore, when leakage current flows, it can be easily detected and damage to the switchboard and housed equipment can be avoided. It is now possible to prevent this.

[0018] Note that the high-voltage insulator of this invention has a conventional conductive band and current detection terminal. It is also possible to make additional configurations, so in this case it is possible to reduce manufacturing costs. It also has the effect of In addition, this insulator can be used not only for supporting high-voltage busbars, but also for supporting high-voltage lines. It can also be used for insulating wires or for insulating low-voltage lines and high-voltage lines.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of a high-voltage insulator according to an embodiment of the present invention and a schematic configuration diagram of a leakage current stopping circuit using this high-voltage insulator.

FIG. 2 is a structural diagram of a conventional high voltage insulator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... High-voltage insulator, 2... Conductive band, 3... Current detection terminal, 4... Current detector, 5... Protective relay circuit (voltage cutoff circuit), 11... Insulator, 12, 13... Wiring mounting member.

Claims (2)

[Scope of utility model registration request] [Claim 1] A high-voltage insulator with wiring attachment members provided at each end of the insulator, which is used by attaching a high-voltage bus bar to one wiring attachment member and attaching a grounding wire to the other wiring attachment member. In the device, a conductive band is wound around a part that does not come into contact with the other wiring mounting member and can maintain an insulated state between the one wiring mounting member and the other wiring mounting member under normal conditions, and detects the current flowing through the conductive band. A high-voltage insulator, characterized in that a terminal is provided so that leakage current flowing from the one wiring attachment member to the conductive band through the side surface of the insulator can be guided to the current detection terminal in the event of an abnormality. 2. The high voltage insulator according to claim 1, which is electrically connected to the current detection terminal provided on the high voltage insulator, and outputs a current detection signal when a current is detected from the current detection terminal. What is claimed is: 1. A leakage current stop circuit comprising: a current detector configured to detect current; and a voltage cutoff circuit that cuts off voltage supplied to the high voltage bus when receiving the current detection signal.