JPS623704Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is designed to reduce abnormal temperature rises that occur, for example, at the connections of high-voltage conductors housed in a metal hermetically sealed container filled with insulating gas. This invention relates to an abnormal temperature detection device for gas insulated equipment that is detected outside.

Conventionally, electrical equipment, especially when its connection parts are housed in a metal sealed container filled with insulating gas,
For example, poor contact may occur at the connection, resulting in heat generation and temperature rise.

However, even in such cases, the heat generation point is inside the metal hermetically sealed container, and due to the danger, especially when high voltage current is being applied, it should be removed from the outside of the metal hermetically sealed container under non-contact conditions. , it is difficult to detect an abnormal rise in temperature, and therefore,
No detection was performed. As a result, the temperature rises quickly due to the large amount of heat generated by the high voltage, which often leads to major accidents if countermeasures are taken too late.

This invention is designed to prevent abnormal temperature rises that occur in the internal high-voltage conductor even when gas-insulated equipment is housed in a metal hermetic container and has a high-voltage conductor, even under operating conditions. The object of the present invention is to obtain an abnormal temperature detection device for gas-insulated equipment that can detect abnormal temperatures in gas-insulated equipment.

In order to achieve this objective, the present invention is designed to generate low-damped free vibrations, which are installed in a high-voltage conductor near an abnormally high temperature area and have mutually different frequencies and each has a single frequency, to the outside of a metal hermetically sealed container. A plurality of first vibrating bodies are arranged in parallel with a gap between each other, and are provided near the first vibrating bodies via a connecting member, and the vibrating part is The plurality of vibrating parts are provided to engage with the vibrating part of the first vibrating body with a gap equal to or less than the amplitude of the vibration, and to be movable along the vibrating parts of the plurality of first vibrating bodies arranged in parallel. a second vibrating body having a sufficiently low frequency with respect to the first vibrating body; and a vibration detector provided on the outer surface of either the metal hermetic container or the conductor insulating support for detecting the vibration of the first vibrating body. and a material whose shape changes depending on temperature is interposed between at least one of the first vibrating body and its installation part and between the connecting member of the second vibrating body and its installation part, and the above-mentioned The device is characterized by being made of a material whose shape changes depending on the temperature so that the second vibrating body moves and engages with the vibrating portion of the plurality of first vibrating bodies due to an abnormal temperature rise. .

Hereinafter, the present invention will be explained based on the accompanying drawings showing one embodiment thereof.

In FIG. 1, reference numeral 1 denotes a metal sealed container, 2 a conductor insulating support made of an insulator, 3 a high voltage conductor, and 4 a contact for connecting the high voltage conductor.
5 is an insulating gas filled and sealed in the metal hermetic container 1; 6 is a vibration detector provided on the outer periphery of the conductor insulating support portion 2 to detect vibrations of a vibrating body installed inside; 7 is an abnormal temperature rise section A plurality of first vibrating bodies, such as tuning forks, which are installed inside the high voltage conductor 3 and vibrate by the impact force applied to the metal hermetic container 1 or the conductor insulating support part 2. The plurality of first vibrating bodies 7 each have a different frequency, for example, are composed of three first vibrating bodies 7a, 7b, and 7c, and as shown in FIGS. 2 and 3, , are arranged in parallel in the groove direction with a slight interval between them. Further, as shown in FIGS. 2 and 3, reference numeral 8 denotes a second vibrating body, which has a
It is provided close to the first vibrating body so that the distance from the first vibrating body 7 is within the amplitude of the vibration of the second vibrating body 8, and like the first vibrating body 7, it is resistant to shocks caused by external forces. It's starting to twist and vibrate. Further, this second vibrating body 8 is a connecting member, for example, a thin plate spring 8.
A material whose shape changes depending on the temperature, such as a bimetal 8a, is provided in the axial direction of the first vibrating body 7, for example, in the groove direction of a tuning fork, through b.
It is attached to. A material whose shape changes depending on the temperature, for example, a bimetal 8a, is used such that the second vibrating body 8 changes in the direction of the several first vibrating bodies 7a, 7b, 7c, for example, in a tuning fork. Along the grooves, the first vibrating bodies 7a, 7b, 7
It is configured to move between

Furthermore, both the first vibrating body 7 and the second vibrating body 8 are installed at a position where the temperature is approximately the same as the temperature of the point where the abnormal temperature rise occurs in the high voltage conductor 3, and where there is no electrical influence. The second vibrating body 8 is configured so that the individual vibrations are very small, and the second vibrating body 8 has a
The frequency of the vibration has been made sufficiently low.

The device of the present invention is constructed as described above, and its operation will now be explained.

First, if the gas insulated equipment operates normally, e.g.
If the contact state between the high voltage conductor 3 and the contact 4, which is the contact portion of the high voltage conductor 3, is also good and no abnormal temperature rise has occurred, for example, the bimetal 8a will not deform. In a normal state, for example, in FIG. 3, it is in a state of shape A, and the vibrating portion of the second vibrating body 8 is in an engaged state with the first vibrating body 7a. In this state, the impact force applied to the metal hermetic container 1 or the conductor insulating support part 2 from the outside of the metal hermetic container 1 is transmitted from the conductor insulating support part 2,
The vibrations are transmitted to the first and second vibrating bodies 7 and 8 via the high voltage conductor 3, etc., but the vibrations of the individual vibrating bodies are small, and therefore the vibrations of the first vibrating bodies 7b and 7c are small. Each vibration has its own unique vibration,
The vibration is transmitted to the vibration detector 6 and detected through the high voltage conductor 3 and the conductor insulating support part 2, or through these and the metal sealed container 1 sequentially. However, the first vibrating body 7a
and the second vibrating body 8 are engaged with each other, and the gap between them is smaller than the vibration amplitude of the second vibrating body 8. Therefore, the vibration of the second vibrating body 8 is reduced by the impact applied from the outside. portion applies an impact to the vibrating portion of the first vibrating body 7, and therefore the first vibrating body 7 generates free damping vibration of a large vibration at a constant frequency for a long time. Therefore,
By detecting this free damping vibration by the vibration detector 6 in the same manner as described above, it can be estimated that the first vibrating body 7a and the second vibrating body are engaged, and as a result, Materials that change shape depending on temperature 8
a remains in shape A without changing;
That is, it is detected that the shape remains in its original shape and there is no change in the surrounding temperature.

On the other hand, poor contact occurs in gas-insulated equipment, for example, between the high-voltage conductor 3 and the contact 4, which is the connection part of the high-voltage conductor 3, and as a result, electrical resistance increases in this part and heat is generated. As a result, when an abnormal temperature rise occurs, the temperatures of both the first vibrating body 7 and the second vibrating body 8 rise. In this case, there is no significant change in the vibration of each vibrating body. However, since the bimetal 8a also increases in temperature, it deforms in accordance with the increased temperature, for example, into a state of shape B, and as a result, the second vibrating body 8 engages with the vibrating part of the first vibrating body 7c. Therefore, when an external impact is applied to this, as described above, only unique vibrations are detected from the first vibrating bodies 7a and 7b, but free vibrations are detected from the first vibrating body 7c. Damped vibration is detected, thereby causing engagement between the first vibrating body 7c and the second vibrating body 8,
That is, it is possible to detect the deformation of the material 8a whose shape changes depending on the temperature into the shape B, that is, the occurrence of an abnormal rise in the ambient temperature.

In the above embodiment, the first vibrating body is composed of three vibrating bodies having different frequencies, the base of the second vibrating body 8 is provided with a material whose shape changes depending on the temperature, and
Although the first vibrating body 7a and the second vibrating body 8 are engaged in the normal state, the present invention is not limited to this.
The first vibrating body may be composed of a plurality of pieces having mutually different frequencies, and a material whose shape changes depending on temperature may be attached to the base of the first vibrating body together with the base of the second vibrating body, or alternatively, the first vibrating body may be It may be provided only at the base of the body to engage the first vibrating body and the second vibrating body. Furthermore, a material other than bimetal that changes shape depending on temperature may be used, and This may be achieved, for example, by engagement between the first vibrating body 7c and the second vibrating body.

As described above, according to the present invention, when an abnormal temperature rise is desired to be detected, a shock is applied from the outside of the metal sealed container and the vibration state of the first vibrating body is detected by the vibration detector, thereby detecting the inside of the sealed container. The abnormal temperature rise of the high voltage conductor can be detected in a non-contact state even under operating conditions where high voltage is applied. can be detected early and reliably, preventing gas from becoming toxic due to decomposition of insulating gas caused by abnormal temperature rise, dielectric breakdown of conductor insulation supports, burnout of connections, etc. It is possible to prevent the development of various major accidents.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a metal sealed container in which an embodiment of the present invention is installed, Fig. 2 is a plan view of the engagement relationship between the first vibrating body and the second vibrating body, and Fig. 3 is a side view thereof. It is a diagram. 1...metal sealed container, 2...conductor insulation support part,
3... High voltage conductor, 4... Contact, 5... Insulating gas, 6... Vibration detector, 7, 7a, 7b,
7c...first vibrating body, 8...second vibrating body, 8a...
...Material whose shape changes depending on temperature (bimetal), 8b...Connecting material (plate spring).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In gas-insulated equipment that has a high-voltage conductor and has a risk of abnormal temperature rise, the above-mentioned abnormal temperature rise is housed in a metal sealed container. A low-damped free vibration that is installed in a high-voltage conductor near the
a plurality of first vibrating bodies arranged in parallel with a gap between them, which are generated by an impact applied from the outside of the metal sealed container; and a connecting member provided near the first vibrating bodies; The vibrating part engages with the vibrating part of the first vibrating body with a gap equal to or less than the amplitude of the vibration, and is movable along the vibrating parts of the plurality of first vibrating bodies arranged in parallel. , and a second vibrating body having a frequency sufficiently lower than that of the first vibrating body, and a second vibrating body provided on the outer surface of either the metal hermetic container or the conductor insulating support part, which detects the vibration of the first vibrating body. a vibration detector, and a material whose shape changes depending on temperature is provided between the first vibrating body and its installation part and at least one of between the connecting member of the second vibrating body and its installation part. The second vibrating body is made of a material whose shape changes depending on the temperature so that the abnormal temperature rise causes the second vibrating body to move and engage with the vibrating portion of the plurality of first vibrating bodies. Abnormal temperature detection device for gas insulated equipment. (2) The first vibrating body is a tuning fork, arranged in parallel in the groove direction of the tuning fork, and the material whose shape changes depending on temperature is a bimetal, and only between the connecting member of the second vibrating body and its installation part. The abnormal temperature detection device for gas insulated equipment according to claim 1, wherein the connecting member is formed of a thin spring plate, and the vibration detector is provided on the outer peripheral surface of the conductor insulating support part. .