JP5189426B2 - Discharge device and temperature monitoring device - Google Patents

Description

  The present invention relates to, for example, a discharge device used in a conductor portion of an electrical device such as an air-insulated switchgear used as a power distribution facility in a factory or a building, and a conductor temperature monitoring device using the discharge device. Is.

For example, when monitoring the temperature of conductor connection parts or contact parts of conventional electrical equipment, for example, by attaching a thermo label that can visually check temperature changes in the vicinity of the conductor connection part or contact part, etc. The temperature abnormality was visually confirmed. Since this method can be confirmed only during periodic inspections, for example, the following devices are known as monitoring techniques that can be constantly monitored.
FIG. 6 is a cross-sectional view of a conventional gas insulated switchgear provided with a temperature monitoring device. In the connection portion of the conductor 22 disposed in the metal container 21, a plurality of contacts 23 are held by a contact force applied by springs 24, and the contactors 23 are positioned in the circumferential direction by the metal fittings 25. Is fixed to one conductor 22 by a bolt. On these outer circumferences, an electric field relaxation shield 27 insulated from the contact 23 by an insulating support portion 26 is provided. The shield 27 and the conductor 22 are connected by a thermal fuse 28. In such a configuration, when a temperature abnormality occurs due to contact failure of the connection portion, the thermal fuse 28 is blown, and the shield 27 is floated to generate a corona discharge. Therefore, the connection portion is detected by detecting the discharge. Temperature abnormality can be detected (see, for example, Patent Document 1).

JP-A-63-64223 (2nd page, FIG. 1)

  As a technique for constantly monitoring the temperature of the conductor connection portion or the contact portion, the configuration of the above-described Patent Document 1 uses a shield for electric field relaxation provided in the conductor connection portion. If this is to be applied to a conductor connection or contact part of an electrical device such as an air-insulated switchgear without a shield, a shield must be newly added, ensuring an insulation distance between ground and between phases. There was a problem that it was impossible.

  The present invention has been made in order to solve the above-described problems, and even in an electric device having a configuration that does not have an electric field relaxation shield, a simple configuration causes an abnormal temperature rise in the conductor portion. It is an object to obtain a discharge device that discharges and a temperature monitoring device that uses the discharge device.

An electric discharge device according to the present invention electrically connects a conductive first member, a conductive second member disposed opposite to the first member, and the first member and the second member. and the heat-sensitive element connected, and an insulating member at one end surrounding the heat sensitive element is a first other end is secured to the member shaped cylinder which is secured to the second member, the first member, the electrical equipment conductors The second member is fixed and connected to the first member by the thermal element only on the side facing the first member, and in the normal state, the second member has the same potential as the conductor. When the temperature of the conductor rises above a predetermined temperature , the connection of the first member and the second member by the heat sensitive element is cut off, and the second member becomes an intermediate potential and the first member and the second member In this configuration, partial discharge is generated between the two members.

  A temperature monitoring device according to the present invention uses the above-described discharge device, and includes a discharge detection device that detects a partial discharge generated in the discharge device, and monitors the temperature of the conductor by monitoring the presence or absence of the partial discharge. It is what you do.

According to the discharge device of the present invention, the first member and the second member arranged to face each other, the thermal element that electrically connects both members , and the cylindrical insulating member that surrounds the thermal element, The second member is fixed to the conductor of the electric device , and the second member is connected to the first member by the heat sensitive element only on the side facing the first member as a connection surface. The second member is at the same potential as the conductor , and when the temperature of the conductor rises above a predetermined temperature , the connection by the thermal element is cut off , and the second member becomes an intermediate potential and the first member and the second member Since the partial discharge occurs between the two, the temperature abnormality of the conductor can be detected by monitoring the presence or absence of the partial discharge.
In addition, the present invention can be widely applied to electrical equipment that does not have an electric field relaxation shield at the connection portion of the conductor, and the apparatus can be easily adopted later as a conductor of an existing electrical equipment.

  Further, according to the temperature monitoring device of the present invention, since the discharge device is provided with the discharge detection device for detecting the partial discharge, the discharge detection device can reliably detect the presence of discharge, and the conductor on which the discharge device is installed. It is possible to constantly monitor the temperature abnormality of the section with a simple configuration.

Embodiment 1 FIG.
1 is a cross-sectional view showing a discharge device according to Embodiment 1 of the present invention.
In the figure, the discharge device includes a conductive first member 1, a conductive second member 2 disposed opposite to the first member at an interval, a first member 1 and a first member. A temperature fuse 3 that is a heat-sensitive element that electrically connects the two members 2, and a cylindrical shape that surrounds the temperature fuse element 3 and has one end fixed to the first member 1 and the other end fixed to the second member 2. The insulating member 4 is provided.
In the figure, the first member 1 in the form of a buried metal and the second member 2 made of a plate-like metal piece are integrally molded with an insulating member 4. The entire discharge device has a shape in which a thermal fuse 3 is enclosed in a container composed of a first member 1, a second member 2, and an insulating member 4.

  The discharge device is attached to the surface of the conductor 5 in the vicinity of the contact portion such as the contact portion of the bus conductor or the contact portion of the switch constituting the main circuit portion of the electrical equipment such as an air insulated switchgear, for example. It is used for the purpose of monitoring the temperature of the connection part and contact part of the conductor. Therefore, an example of a method of attaching to the conductor 5 will be described. As shown in FIG. 1, an attachment hole 5 a is made in the conductor 5, and a screw hole provided on the attachment surface of the first member 1 is aligned with that portion. Tighten and fix with bolts 6. In the fixed state, the second member 2 is electrically connected to the conductor 5 via the thermal fuse 3 and the first member 1 and has the same potential.

A discharge detection device used as a temperature monitoring device in combination with the above discharge device will be described with reference to FIG. The discharge detection device in FIG. 3A is configured by an antenna 8 and a discharge detection unit 9, and (b) is configured by an optical sensor 10 and a discharge light detection unit 11. These can be used properly according to the situation. In addition, since these discharge detection apparatuses can apply the technique generally known with the partial discharge detection apparatus of the air insulation switchgear, the gas insulation switchgear, etc., detailed description is abbreviate | omitted here.
If the temperature monitoring target is the conductor of the air insulated switchgear, in the form (a), the antenna 8 receives the electromagnetic waves of the partial discharge, so that the installation location is relatively within the panel of the air insulated switchgear. Although it can be arranged freely, it is not particularly required to be in the board as long as it can receive electromagnetic waves. On the other hand, in the form (b), since the discharge light is detected by the optical sensor 10, it is desirable to install in the vicinity of the discharge device.

Next, operations of the discharge device and the temperature monitoring device provided with the discharge detection device in the discharge device will be described.
When a contact failure or the like occurs in the vicinity of the conductor 5 to which the discharge device is attached, for example, at the connection portion or the contact portion, and the temperature of the connection portion or the contact portion rises above a predetermined temperature, the temperature fuse 3 is melted and the second The member 2 becomes an intermediate potential, and partial discharge occurs between the first member 1 and the second member 2. This partial discharge is detected by a discharge detector as shown in FIG. 3 (a) or (b) installed inside or outside the housing (not shown) of the electrical equipment in which the conductor 5 is accommodated. Thus, it is possible to constantly monitor the presence or absence of an abnormality such as a contact failure in the conductor connection portion or the contact portion.

In FIG. 1, the case where the thermal fuse 3 is used as the thermal element used in the discharge device has been described. Next, another example will be described.
FIG. 2 shows a case where bimetal 7a or shape memory alloy 7b is used as the thermal element. Since the configuration other than the thermal element is the same as that of FIG. Also, the basic operation is the same, and when a contact failure or the like occurs in the conductor 5, for example, the connection portion or the contact portion, and the connection portion or the contact portion reaches a predetermined temperature or more, the bimetal 7 a or the shape memory alloy 7 b is changed. As shown by a broken line in the figure, the connection is disconnected due to deformation, the second member 2 becomes an intermediate potential, and partial discharge occurs between the first member 1 and the second member 2. .

  In the above description, the predetermined temperature at which the connection of the thermosensitive element (the thermal fuse 3, the bimetal 7a, the shape memory alloy 7b) is cut off is an abnormal state in which a contact failure or the like occurs at the connection or contact portion of the conductor 5. Is the temperature of the connection portion or the contact portion when it is determined that the temperature is appropriately determined in terms of design from the device specifications or the usage environment.

  1 and 2, the first member 1 is described as a metal-filled shape, and the second member 2 and the second member 2 are molded with the insulating member 4. A structure in which the first member and the second member are fixed to both ends of the cylindrical insulating member by adhesion.

1 and 2, the first member and the second member 2 are described as metals. However, the first members and the second members 2 are not necessarily metals, and may be conductive synthetic resins.
Examples of the conductive synthetic resin include conductive rubber and conductive plastic. Examples of the conductive plastic include polyacetylene, polythiophene, polypyrrole, polyaniline, polyazulene, etc., as the plastic itself has conductivity. In addition, there are conductive particles such as graphite, carbon black, and metal powder mixed in a nonconductive plastic, which can be used as appropriate.

As described above, according to the discharge device of the present embodiment, the conductive first member, the conductive second member disposed opposite to the first member, the first member, and the first member A heat-sensitive element that electrically connects the two members, and a cylindrical insulating member that surrounds the heat-sensitive element and has one end fixed to the first member and the other end fixed to the second member, The member is fixed to the conductor of the electrical device , and the second member is connected to the first member by the thermal element with only the side facing the first member as a connection surface. The second member is at the same potential as the conductor , and when the temperature of the conductor rises above a predetermined temperature , the connection of the first member and the second member by the thermal element is cut off, and the second member becomes the intermediate potential. since partial discharge between the first member and the second member Te is adapted to generate, to monitor the presence or absence of a partial discharge It is possible to detect the temperature abnormality of the conductor between. If the discharge device is arranged in the vicinity of the connection portions or contact portions of the plurality of conductors, an abnormality such as a contact failure of the connection portions or contact portions can be reliably detected.
Further, for example, it can be easily attached to the main circuit conductor of an air-insulated switchgear in which the connection portion does not have an electric field relaxation shield.
Furthermore, the present apparatus can be easily adopted later as a conductor of an existing electrical device.

  In addition, when a thermal fuse is used as the thermal element, the connection is completely cut off when the temperature of the conductor is abnormal and a partial discharge is generated, so that the abnormality can be reliably detected.

  Further, when a bimetal or a shape memory alloy is used as the thermal element, it can be used repeatedly.

  In addition, at least one of the first member and the second member is made of metal or conductive synthetic resin, and in the case of conductive synthetic resin, it is made of conductive rubber or conductive plastic. As a material, it can select suitably from many materials according to a specification.

  In addition, since the above-described discharge device is equipped with a discharge detection device that detects partial discharges, a temperature monitoring device is configured, and the temperature of the conductor is monitored by monitoring the presence or absence of partial discharges. The presence or absence of discharge can be detected, and the temperature abnormality of the conductor portion provided with the discharge device can be constantly monitored with a simple configuration.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view showing a state in which the discharge device according to Embodiment 2 of the present invention is attached to the conductor connection. Parts equivalent to those in FIG. 1 are denoted by the same reference numerals.
In the figure, the discharge device includes a conductive first member 12, a second member 13 disposed opposite to the first member 12 at an interval, and the first member 12 and the second member 13. A thermal fuse 3 as a thermal element to be electrically connected, and a cylindrical insulating member 14 surrounding the thermal fuse 3, one end fixed to the first member 12 and the other end fixed to the second member 13. I have. That is, the temperature fuse 3 is enclosed in a container composed of the first member 12, the second member 13, and the insulating member 14. If the insulating member 14 is made of, for example, transparent resin or glass, the state of the thermal fuse 3 can be confirmed from the outside. As in the first embodiment, the material of the first member 12 and the second member 13 may be a conductive synthetic resin other than metal.

Further, in order to removably attach the structure configured as described above to the conductor 5 of the electric device, for example, in the vicinity of the connection portion or the contact portion, the conductive holding member fixed to the conductive attachment plate 15 is provided. A tool 16 is provided. The holder 16 is formed by, for example, bending a metal plate material having spring properties into a dimension that allows the mounting surface side of the first member 12 to be inserted, and allowing the mounting plate 15 to be conductive such as screwing or brazing. It is fixed with. The attachment plate 15 is attached and fixed to the connection portion of the conductor 5 using the connection bolt 17 and the nut 18 of the connection portion of the conductor 5.
By inserting the mounting surface side of the first member 12 into the holder 16, the assembled state as shown in the figure is obtained, and the second member 13 is the thermal fuse 3, the first member 12, the holder 16, and the mounting plate. 15 and is electrically connected to the conductor 5 through the same potential. As in the first embodiment, this discharge device is normally used as a temperature monitoring device in combination with, for example, a discharge detection device as shown in FIG.

Next, the operation will be described.
As in the first embodiment, when a contact failure or the like occurs in the conductor 5, for example, at the connection portion or the contact portion and the temperature of the connection portion or the contact portion rises to a predetermined level or more, the thermal fuse 3 is blown and the second The member 13 becomes an intermediate potential, and a partial discharge occurs between the first member 12 and the second member 13. By detecting this partial discharge with the same discharge detection apparatus diagram as FIG. 3 of Embodiment 1 installed in the electrical equipment in which the conductor 5 is accommodated, it is possible to constantly monitor the presence or absence of temperature abnormality of the conductor. . In the case of this embodiment, when the fuse is blown, the discharge device can be easily removed from the holder 16 and replaced with a new one, and can be recovered in a short time.

  Although the case where the thermal fuse 3 is used as the thermal element has been described with reference to FIG. 4, FIG. 5 shows the case where the bimetal 7a or the shape memory alloy 7b is used as the thermal element. Except for the thermal element, it is equivalent to FIG. Also, the basic operation is the same as in FIG. 4, and when the temperature of the connecting portion or the contacting portion of the conductor 5 rises to a predetermined level or more, the bimetal 7a or the shape memory alloy 7b is deformed as indicated by a broken line and disconnected. The second member 13 is at an intermediate potential, and a partial discharge is generated between the first member 12 and the second member 13.

In addition, the attachment / detachment structure between the first member 12 and the holder 16 is not limited to that shown in the drawing, and any structure that can be engaged and detached while being energized may be used.
Moreover, although the attachment plate 15 showed what was attached using the connection hole of the conductor 5, you may provide an attachment hole separately and it may provide in the vicinity of a conductor connection part or a contact part.
Further, the attachment plate 15 can be omitted, and the holder 16 may be directly attached to the conductor 5.

As described above, according to the present embodiment, the holding member for detachably attaching the first member to the conductor is provided , and the first member is inserted and fixed to the holding fixture fixed to the conductor. Therefore, in addition to the same effects as those of the first embodiment, the discharge device can be easily replaced.

  In addition, since the above discharge device is equipped with a discharge detection device that detects partial discharge, the discharge detection device can reliably detect the presence or absence of discharge, and the temperature abnormality of the conductor part of the electrical equipment in which the discharge device is installed can be simply configured. Can be monitored at any time.

It is sectional drawing which shows the state which attached the discharge device by Embodiment 1 of this invention to the conductor. It is sectional drawing which shows the other example of the discharge device by Embodiment 1 of this invention. It is a schematic block diagram of the discharge detection apparatus used in combination with the discharge apparatus by Embodiment 1 of this invention. It is sectional drawing which shows the state which attached the discharge device by Embodiment 2 of this invention to the conductor. It is sectional drawing which shows the other example of the discharge device by Embodiment 2 of this invention. It is sectional drawing of the gas insulated switchgear provided with the temperature monitoring apparatus of the conventional conductor connection part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 3 Thermal fuse (thermal element) 4 Insulation member 5 Conductor 5a Mounting hole 6 Bolt 7a Bimetal (thermal element)
7b Shape memory alloy (heat-sensitive element) 8 Antenna 9 Discharge detection unit 10 Optical sensor 11 Discharge light detection unit 12 First member 13 Second member 14 Insulating member 15 Mounting plate 16 Holder 17 Bolt 18 Nut

Claims (7)

A conductive first member, a conductive second member disposed opposite to the first member, a thermal element electrically connecting the first member and the second member; A cylindrical insulating member that surrounds the thermal element and has one end fixed to the first member and the other end fixed to the second member;
The first member is fixed to a conductor of an electrical device ;
The second member is connected to the first member by the thermal element with only the side facing the first member as a connection surface,
In a normal state, the second member is at the same potential as the conductor, and when the temperature of the conductor rises above a predetermined temperature, the connection of the first member and the second member by the thermosensitive element is A discharge device configured to be interrupted and to generate a partial discharge between the first member and the second member when the second member becomes an intermediate potential . 2. The discharge device according to claim 1, further comprising: a holder for detachably attaching the first member to the conductor , wherein the first member is inserted and fixed to the holder fixed to the conductor. discharge apparatus characterized by there.   3. The discharge device according to claim 1, wherein the thermal element is a thermal fuse.   3. The discharge device according to claim 1, wherein the thermal element is a bimetal or a shape memory alloy. 4.   5. The discharge device according to claim 1, wherein at least one of the first member and the second member is made of metal or conductive synthetic resin. Discharge device.   6. The discharge device according to claim 5, wherein the conductive synthetic resin is a conductive rubber or a conductive plastic.   By using the discharge device according to any one of claims 1 to 6, comprising a discharge detection device that detects the partial discharge generated in the discharge device, and monitoring the presence or absence of the partial discharge. A temperature monitoring device characterized in that the temperature of the conductor is monitored.

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