JPS6199231A - Sealed switch gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention - Technical Field The present invention relates to a seal opening/closing device (hereinafter, IJfl closing device is used as a concept including a shutoff device), and more specifically, to a gas ( For example, SF with excellent arc-extinguishing properties
The present invention relates to a seal opening/closing device capable of detecting abnormal pressure and abnormal temperature inside a container sealed with gas (6 gases, etc.).

<Prior Art> Conventionally, a large number of sealed opening/closing devices have been provided that enhance opening/closing performance by sealing gas inside.

If gas leakage occurs in these sealed opening/closing devices, they will no longer be able to exhibit the desired opening/closing performance.

Additionally, inside the sealed switchgear, electricity is applied when the fixed contact and movable contact are in contact, and electricity is cut off when the fixed contact and movable contact are separated, maintaining good switching performance. While the arc extinguishing performance is good, there is not much upper temperature limit for the sealed switchgear as a whole. However, if the arc extinguishing performance decreases due to contact wear etc. The arc remains for a long time when it is cut off, and the temperature of the entire sealed switchgear increases significantly.

In other words, fluctuations in internal pressure and fluctuations in temperature are both indicators that the opening/closing performance has deteriorated.
By installing a temperature detector and a pressure detector separately inside the sealed opening/closing device, temperature fluctuations and pressure fluctuations are detected, and an alarm is issued when the temperature and pressure fluctuations reach a predetermined value. I try to emit this.

In the case of the above conventional example, the temperature detector and pressure detector are installed inside the container of the seal opening/closing device, so the temperature detector and pressure detector are separate devices, making it complicated and expensive. Particularly, if a temperature sensor and a pressure detector are attached to each equipment section of the seal opening/closing device and are operated locally, there is a disadvantage that the seal opening/closing device becomes larger as a whole.

<Purpose> This invention was made in view of the above problems,
It is an object of the present invention to provide a seal opening/closing device that integrates a temperature sensor and a pressure sensor, is made compact, and can be downsized as a whole.

In order to achieve the above object, the seal opening/closing device of the present invention has a diaphragm that expands and contracts depending on the internal pressure of the container and contacts the movable contact of the abnormality detection switch with the fixed contact side at a predetermined critical pressure. It also has a support member made of a shape memory alloy that moves the fixed contact to the movable ωJ contact side and brings it into contact at a predetermined critical temperature, and reduces the difference between the pressure inside the container and the pressure inside the diaphragm. The diaphragm expands and contracts due to pressure, activating the pressure abnormality detection switch, and even if the pressure inside the container is normal, when the temperature reaches the critical humidity, the support member deforms and activates the pressure horn abnormality detection switch. , the occurrence of temperature or pressure abnormalities can be detected.

However, the support member made of shape memory alloy may be attached in parallel with the diaphragm, or the support member made of shape memory alloy may be formed into a frame shape and enclose the diaphragm. Good too. Since a pressure abnormality usually means a pressure drop, the fixed contact is moved in the direction opposite to the direction of extension of the diaphragm at a predetermined critical temperature, and the pressure abnormality detection switch is activated. It is preferable to do so.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic vertical cross-sectional view of the seal opening/closing device, and shows a container (1
), a fixed contact (21), a movable contact (3), a movable contact drive mechanism (not shown), etc. are attached, and a differential detection unit (4) is attached at a predetermined position. (2) and the movable contact (3) are drawn out to the outside of the container (1) via lead terminals (2+) and (31), respectively.

Further, as is clear from FIG. 2, the abnormality detection section (4) is located at a predetermined position inside the container (1) (a support section U made of a shape memory alloy whose new surface shape is a mouth shape). 41) is installed, and a diaphragm (42) with an internal pressure set to a predetermined value is hung down from the upper plate of the support part U (41), and the diaphragm (
42) A pressure abnormality detection switch is constructed by placing a movable contact (43) and a fixed contact (44) in opposition to each other at the lower end and the lower root of the support member (41). It is.

The diaphragm (42) expands and contracts depending on the internal pressure of the container (1), and is made of an electrically insulating material. Further, electrical insulation is provided between the container (1) and the support member (41) or between the support member (41) and the fixed contact (44).

With the above configuration, the diaphragm (42) expands and contracts in response to the differential pressure Ps-Pi between the internal pressure ps of the diaphragm (42) and the internal pressure Pi of the container (1), and the differential pressure reaches a predetermined critical level. When the value is reached, the movable contact (43) and fixed contact (
44), it can be detected that an abnormality has occurred. More specifically, since the pressure P1 is higher than the normal human pressure, the abnormal pressure means a decrease in pressure. For example, if the internal pressure ps of the diaphragm (42) and the internal pressure Pi of the container (1) are set exclusively, and the pressure Pi decreases by ΔP due to gas leakage, the differential pressure between the two pressures Diaphragm (4) corresponding to △P
2) expands, and the movable contact (43) and fixed contact (44)
and the distance δ is decreased. Therefore, if the distance δ is set to be O when the differential pressure △P reaches the critical value P1, the contact between the two contacts (43) and (44) will indicate that an abnormality has occurred. can be detected.

Additionally, if the temperature rises to a predetermined critical temperature,
It is possible to detect that an abnormality has occurred by contracting the shape memory alloy support member (41) and bringing both contacts (43) and (44) into contact regardless of the differential pressure ΔP. .

However, in the above example, it is not possible to determine whether a pressure abnormality is a temperature abnormality, but regardless of the abnormality, the expected opening/closing performance cannot be achieved, and the sealing opening/closing device must be inspected. , soot removal, etc. are required, so there is no particular inconvenience even if it cannot be determined.

It should be noted that the present invention is not limited to the above-described embodiments. For example, the present invention is not limited to the embodiments described above.
The movable contact (43) is fixed to the holding member (41) and attached to the upper end of the diaphragm (42).
42) can be attached directly to the container (1), and a support member that can be bent or otherwise deformed at a critical temperature can be used. In addition, various design changes can be made without changing the gist of the present invention. can be applied.

<Effects> As described above, in this invention, the diaphragm, which expands and contracts in response to the pressure difference within the container, is forcibly expanded when a predetermined critical temperature is reached. Even if any abnormality occurs, the abnormal state can be reliably detected, and the abnormal state detection mechanism described above can be integrated, simplifying and downsizing, making it inexpensive and sealed. It has unique effects such as being able to be easily installed for each equipment category of the switchgear.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal cross-sectional view of the seal opening/closing device, and FIG. 2 is an enlarged cross-sectional view of the main part. (1)... Container, (4)... Abnormality detection section, (41)
...Support member, (42) ...Diaphragm, (43
)...Movable contact, (44)...Fixed contact Figure 1 Figure 2

Claims (1)

[Claims] 1. Fixed contacts, movable contacts, and movable contacts Sealed container with drive mechanism etc. enclosed inside the container An opening/closing device, which is controlled by the pressure inside the container. Expands and contracts and detects pressure abnormalities at a predetermined critical pressure. Touch the movable contact of the switch to the fixed contact side It has a diaphragm that allows The fixed contact is connected to the movable contact at a predetermined critical temperature. Shape memory joint that moves to the point side and makes contact. Features a support member made of gold Sealed opening/closing device.