JP2003092822A - Device for improving tangent delta of insulating oil in of cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for improving tanδ of insulating oil in an OF cable, which can improve tanδ of the insulating oil without needing a large quantity of insulating oil and without stopping the charge of a line. SOLUTION: In this device for improving tanδ of the insulating oil in an OF cable, an external circulation path consists of an oil pipe 14 for extracting and feeding back the insulating oil from the insulating oil circulation point of the joint 12 and a pump 16 in an OF cable line 10 device, and material 20 for adsorbing impurities in the insulating oil is arranged in the container 18 within this external circulation path (on its way).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable portion or a joint portion of an OF cable installed on site,
The present invention relates to a device that improves tan δ of insulating oil that is circulated and stored in a fuel tank or the like.

[0002]

2. Description of the Related Art Conventionally, the insulating oil contained in OF cables, joints, refueling tanks, etc. increases in trace amounts of impurities (metal ions, etc.) and its tan .delta. In order to improve tan δ, a so-called flushing method is used in which the used insulating oil is completely replaced with new oil.

However, the conventional flushing method has the following problems. Replacing the insulating oil completely requires a large amount of insulating oil, which is costly. Further, usually, a single flushing cannot be expected to be sufficiently improved, and thus a plurality of flushing is required, and the amount of insulating oil used is extremely large, which is an obstacle to cost reduction. Further, it is necessary to stop the line of the cable each time flushing is performed, which requires complicated processing such as adjustment of power demand. Further, the treatment of the insulating hot water to be discarded for flushing may be a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and does not require a large amount of insulating oil and does not stop charging of the line. It is an object of the present invention to provide a tan δ improvement device for OF cable insulating oil that can improve tan δ of the above.

[0005]

The present invention is characterized in that an impurity adsorbing material for insulating oil is arranged inside an insulating oil circulating portion such as a cable portion, a joint portion or an oil tank in an OF cable line device. It is a device for improving tan δ of insulating oil of OF cable. In the present invention, it is preferable that a pump for forcibly circulating the insulating oil through the impurity adsorbent is arranged at the insulating oil circulation point. Further, the present invention provides a cable portion in an OF cable line device,
An external circulation path is formed to take out insulating oil from an insulating oil distribution point such as a joint section or an oil tank to the outside and return to the distribution point, and an impurity adsorbing material for insulating oil is arranged in the external circulation path. It is a device for improving tan δ of insulating oil of OF cable. In the present invention, it is preferable to dispose a pump for forcibly circulating the insulating oil in the impurity adsorbent in the external circulation path. As a material for adsorbing impurities in the insulating oil, for example, activated alumina, activated carbon, molecular sieve, neobeat, silica gel are suitable.

According to the present invention having the above-mentioned structure, in the OF cable line device, impurities can be adsorbed by the adsorbent (adsorbent) to be cleaned, so that the insulating oil is not replaced with a new one by the flushing method, and Since the impurities can be removed continuously with the impurity adsorbent, the amount of insulating oil used can be reduced and the maintenance cost can be reduced. Also,
Since the clean insulating oil after adsorbing the impurities is returned to the OF cable device and circulated, the impurities can be removed without removing the insulating oil from the OF cable, and the insulating oil can be cleaned without a power failure of the cable. Impurity adsorption material is OF
It may be either inside the insulating oil circulating portion of the cable or inside the external circulation path.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1, FIG. 2 and FIG. 3 are explanatory views of a first embodiment, a second embodiment and a third embodiment of an tan δ improvement device for OF cable insulating oil to which the present invention is applied.

As shown in FIG. 1, in the first embodiment, O
In the F cable line 10 device, an external circulation path including an oil supply pipe 14 and a pump 16 is formed from the insulating oil circulation point of the joint section 12 to the outside and returned to the circulation point. ) Is a device for improving the tan δ of insulating oil of an OF cable in which an impurity adsorbing material 20 for insulating oil (the same applies to an adsorbent) is arranged in the container 18).

The external circulation path is connected to the oil supply pipe 14 through the insulating connectors 22 and 22 from the circulation point of the insulating oil, and the pump 16 supplies the insulating oil from the oil supply pipe 14 to the container 18 and further.
By returning to the joint portion 12 through the oil supply pipe 14, the insulating oil is forcibly circulated and brought into contact with the impurity adsorbing material 20 in the container 18, and the impurities are forcibly removed.
It is designed to improve tan δ. As a material for adsorbing impurities in the insulating oil, for example, activated alumina, activated carbon, molecular sieve, neobeat, silica gel are suitable.

If necessary, the insulating oil may be circulated to the external circulation path by natural circulation without the pump 16.

As shown in FIG. 2, the second embodiment is O
In the F cable line device, an external circulation path is formed by an oil supply pipe 14 and a pump 16 for taking out insulating oil from the insulating oil circulating portion of the terminal end 24 to the outside and returning the insulating oil to the circulating portion. The same parts as those in FIG. 1 are designated by the same reference numerals.

As shown in FIG. 3, in the third embodiment, in the OF cable line device 10, the insulating oil is taken out from the insulating oil circulating portion of the insulating oil tank 26 and returned to the circulating portion. An external circulation path including a pipe 14 and a pump 16 is formed. The same parts as those in FIG. 1 are designated by the same reference numerals. In any of the second and third embodiments, the insulating oil may be circulated to the external circulation path by natural circulation without the pump 16 if necessary.

According to the first to third embodiments having the above-mentioned structures, in the OF cable 10 line device, by passing the insulating oil through the adsorbent, not only the tan δ of the insulating oil is improved, but also the moisture content is contained. Can be removed. Therefore, since the impurities can be continuously and continuously removed by the impurity adsorbent without replacing the insulating oil with a new one by the flushing method, the insulating oil used can be reduced and the maintenance cost can be reduced. In addition, since clean insulating oil after adsorbing impurities is returned to the OF cable device and circulated, the impurities can be removed without removing the insulating oil from the OF cable, and the insulating oil can be cleaned without causing a cable power failure. . According to the inventor's knowledge, at the laboratory level, the insulating oil, which had a tan δ of 20% before the improvement, was about 10 at room temperature.
It was confirmed that the tan δ became 1% or less by passing through the adsorbent for 0 days and at RT of 60 ° C. for about 30 days. In this case, the amount of adsorbent was about 60% of the insulating oil.

In the first to third embodiments, the impurity adsorbing material is provided outside the insulating oil circulating portion of the OF cable. However, even if it is naturally circulated toward the inside of the circulating portion,
Any case of forced circulation by a pump is within the scope of the present invention.

[0015]

As described above, according to the present invention, in the OF cable line device (OF cable, joint portion, terminal portion, insulating tank portion, etc.), the insulating oil can be replaced by a new one by the flushing method. Moreover, since the impurities can be continuously removed by the impurity adsorbent, the amount of insulating oil used can be reduced and the maintenance cost can be reduced. In addition, clean insulating oil after absorbing impurities
Since it is returned to the F cable device and circulated, the impurities can be removed without removing the insulating oil from the OF cable, and the insulating oil can be cleaned without causing a power failure of the cable. You can

[Brief description of drawings]

FIG. 1 is a tan of an OF cable insulating oil to which the present invention is applied.
FIG. 3 is an explanatory diagram of the first embodiment of the Δ improvement device.

FIG. 2 is an explanatory diagram of a second embodiment.

FIG. 3 is an explanatory diagram of a third embodiment.

[Explanation of symbols]

10 OF cable track 12 Joint section 14 Refueling pipe 16 pumps 18 containers 20 Impurity adsorption material 22 Insulated connector

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuzo Ishii             1-5-1 Kiba Stock Market, Koto-ku, Tokyo             Inside Fujikura (72) Inventor Koichi Hiroishi             1-5-1 Kiba Stock Market, Koto-ku, Tokyo             Inside Fujikura

Claims (4)

[Claims] 1. An tan δ improvement of insulating oil of an OF cable, wherein an impurity adsorbing material of insulating oil is arranged inside an insulating oil circulating portion such as a cable portion, a joint portion or a refueling tank in an OF cable line device. apparatus. 2. The tan of the OF cable insulating oil according to claim 1, wherein a pump for forcibly circulating the insulating oil into the impurity adsorbing material is arranged at the insulating oil circulating portion.
δ improvement device. 3. In the OF cable line device, an external circulation path is formed to take out insulating oil from an insulating oil distribution point such as a cable section, a joint section or an oil tank and return it to the distribution section. An insulating oil tan δ improvement device for an OF cable, characterized in that an impurity absorbing material for insulating oil is arranged in the. 4. The tan δ improvement device for OF cable insulating oil according to claim 3, wherein a pump for forcibly circulating the insulating oil through the impurity adsorbing material is arranged in the external circulation path.