JPH0130801Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an abnormality detection device for sealed electrical equipment in which a high-voltage circuit is housed in a sealed container filled with an insulating medium, and is improved so that the detector can be easily replaced. be.

In recent years, it has become difficult to secure land for substations in urban centers and surrounding areas, despite the increasing demand for electricity. One way to address this problem is to use sealed electrical equipment, which is smaller than air-insulated electrical equipment, and to configure substations and the like so that live parts are not exposed.

However, sealed electrical equipment is one in which a circuit breaker, disconnector, or grounding device is housed in a sealed container filled with a highly insulating gas such as SF ₆ gas or an insulating medium such as insulating oil. Therefore, as a method for detecting small abnormalities such as the occurrence of corona inside a sealed container, or detecting abnormalities when a major accident such as a short circuit occurs inside a sealed container, light generated by abnormal discharge is used. , abnormal temperature, abnormal pressure, decomposition gas, etc. are detected using a detector. The detector is usually placed in a closed container, and abnormal conditions can be detected by displaying the output of the detector on an external display or the like.

However, if the detector is simply installed in a sealed container, if the detector breaks down and needs to be repaired or replaced, first collect the insulating medium and open the sealed container. Next, the detector must be taken out to the outside for repair or replacement work, and after that, work such as evacuation and refilling with insulating medium must be performed. Therefore, repairing or replacing the detector is extremely complicated, takes a long time, and is extremely uneconomical. Furthermore, since sealed electrical equipment is extremely sensitive to dust and moisture, when carrying out the above-mentioned work on-site, i.e. at power generation and substations, it is necessary to take the utmost care to prevent the intrusion of dust and moisture. It was hot.

The following conventional techniques are available as means for solving the above-mentioned problems in repairing or replacing the detector. This is an abnormality detection device that is equipped with a detector on the shaft, one end of which is housed in a sealed container, the other end is exposed outside the container, and is slidably and airtightly attached to the container. It is said that According to this, when repair or replacement is required, the shaft body is slid to expose the detector, which is normally inside a sealed container, to the outside.
After repairing or replacing the detector, the shaft can be slid in the opposite direction to store the detector. Therefore, since there is no need to open the sealed container, operations such as recovery of the insulating medium, evacuation, and refilling of the insulating medium as described above become unnecessary.

However, this conventional technique has the following drawbacks.

(1) Removal, repair, or replacement of the detector from the shaft, as well as installation to the shaft, must be carried out on-site because the shaft remains attached to the sealed container.

(2) Therefore, during the above-mentioned work, the shaft body is exposed outside the closed container, and dust and moisture are likely to adhere to it.

(3) Therefore, when storing the shaft in a closed container after the work is completed, it becomes necessary to clean the shaft and remove water to prevent dust and moisture from entering the closed container.

(4) Furthermore, the work of attaching and sealing lead wires when repairing or replacing the detector is extremely difficult and takes a long time, and the reliability of the work is inevitably reduced.

The present invention has been developed in view of the drawbacks (1) to (4) of the above-mentioned prior art.
To provide an abnormality detection device in which a detector can be easily replaced and the work can be done in a short time, and can be replaced without dust or moisture entering into a closed container. The present invention will be described below with reference to embodiments shown in the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 4. In each figure, reference numeral 1 denotes a closed container, in which an insulating medium 2 is filled and a high voltage circuit 3 is housed. Reference numeral 4 denotes a shaft body, and this shaft body slidably passes through the closed container 1, and both ends thereof are exposed to the outside. 5a to 5d are seal members attached to the closed container 1, and the shaft body 4 is attached to the closed container 1 in an airtight and slidable manner by two seal members at each of its upper and lower ends. . Reference numeral 6 denotes a detector for detecting an abnormality in the high voltage circuit 3, and detects abnormal light generated due to, for example, a short circuit accident. The detector 6 is installed in a portion of the shaft 4 that occupies the inside of the closed container 1 so as not to protrude from the surface of the shaft 4, such as by being buried. Reference numeral 7 denotes a terminal portion provided at the lower end of the shaft body 4, and the terminal portion 7 and the detector 6 are connected by a lead wire 8 embedded in the shaft body 4. This terminal section 7 is connected to a display and a protection device (both not shown).
9 is another shaft body, and this other shaft body 9 has the same outer diameter as the shaft body 4 and the same length or longer length, but is not equipped with a detector etc. Both shaft bodies 4 and 9 are formed so that their ends can be attached to and detached from each other. In this example, it can be attached and detached by screwing, and the upper end surface of the shaft body 4 has a female thread 4a.
A male thread 9a is provided on the lower end surface of the other shaft body 9. Reference numeral 10 denotes a fixture that also serves as a lid and is detachably attached to the closed container 1. The shaft body 4 attached to the closed container is fixed to this fixture 10 with bolts 11 to prevent it from falling off.

Suppose now that the detector 6 has malfunctioned and needs to be replaced. In this case, the fixture 10 is removed from the mounted state shown in FIG. 1, and another shaft 9 is screwed onto the upper end of the shaft 4 to connect it as shown in FIG. When the other shaft body 9 is slid downward in this connected state, the shaft body 4 also slides downward together. When the other shaft 9 reaches the mounting position with the closed container 1 instead of the shaft 4, the shaft 4 is attached to the closed container 1 as shown in FIG.
It becomes completely exposed. In this exposed state, the shaft body 4 is separated from the other shaft body 9, and a normal detector 6', which has undergone strict quality control at a factory etc., is replaced instead.
A novel shaft body 4' having a terminal portion 7' and a lead wire 8' is connected. In this connected state, the new shaft 4' is slid upward, and the original shaft 4' is replaced as shown in FIG.
Return it to the position where it was installed. In this state, the other shaft body 9 is completely exposed from the closed container 1, so
The other shaft body 9 is removed and a new shaft body 4' is fixed with a fixture 10 and a bolt 11. This completes the replacement work and brings the device into the state shown in FIG.

In the above-mentioned replacement work, in the process of sliding the shaft 4 and the other shaft 9 and the other shaft 9 and the new shaft 4' together, both ends are each sealed with two stages of sealing members. Therefore, the insulating medium 2 will not leak from the joint between the shaft bodies. That is, no matter which seal member the seam abuts, airtightness is maintained by the adjacent seal member. However, since the two connected shaft bodies are simply slid, the time required for sliding is extremely short.
It is also practically possible to configure the sealing member in one stage each in the upper and lower stages instead of in two stages as shown.

By the way, in the above-mentioned embodiment shown in FIGS. 1 to 4, the shaft 9, which is not equipped with any detector etc., is used as another shaft, and the shaft 4 is exchanged with a new shaft 4' using this as an intermediary. However, a new shaft 4' may be used as another shaft and directly connected to one end of the original shaft 4 for replacement. In this case, replacement can be done easily by simply separating the original shaft body 4 when the condition is similar to that shown in FIG.

It goes without saying that the detector may be one that detects abnormal temperature, abnormal pressure, decomposed gas, etc., in addition to one that detects light emission due to abnormal discharge or the like.

As explained above in conjunction with the embodiments, according to the present invention, the detector of the abnormality detection device can be replaced without opening the sealed container. Furthermore, the detector can be replaced by replacing the entire shaft body to which the detector is attached. Therefore, rather than on-site work at a power generation substation, etc., products that have undergone strict quality control at a factory, etc. can be used as they are. Moreover, since the entire shaft body is replaced, the time that the shaft body is exposed to the outside is extremely short, and there is almost no risk of dust or moisture adhering to it. No intrusion.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
Figures 1 to 4 are cross-sectional views showing the process of replacing the detector in this embodiment. In the drawing, 1 is a closed container, 2 is an insulating medium, 3 is a high voltage circuit, 4, 4' is a shaft body equipped with a detector, 4a is a female thread, 5a, 5b, 5c, 5d are seal members,
6 and 6' are detectors, 7 and 7' are terminal parts, 8 and 8' are lead wires, 9 is another shaft body, and 9a is a male screw.

Claims (1)

[Scope of utility model registration request] A hermetically sealed electrical device in which a high voltage circuit is housed in a hermetic container filled with an insulating medium, a shaft body slidably penetrating and attached to said hermetically sealed container, and a shaft body attached to said hermetically sealed container slidingly contacting said shaft body. a sealing member that maintains airtightness; and a detector that detects an abnormality in the high voltage circuit, and is mounted on a portion of the shaft that occupies the airtight container without protruding from the shaft. and the shaft body has at least one end thereof a connection part that is detachable from one end of the other shaft body that can slidably penetrate the closed container and be attached in an airtight manner, and the shaft body is integrated with the other shaft body. 1. An abnormality detection device for a sealed electrical device, characterized in that the shaft body is attached to and removed from the sealed container in an airtight state by sliding.