JPH09218235A - Apparatus for measuring insulation properties of electrical structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the deterioration of insulation properties on a large electrical structure accurately at all times. SOLUTION: Nonconductive FRP rods 12 are employed for reinforcing base concrete 13. A large electrical structure, i.e., a transformer 14 for RF heating furnace, is set on a base 11 constructed of the base concrete 13 and FRP rods 12 connected with anchor bolts 15. A measuring unit 17 is connected with the earth wire 16 of transformer 14 for RF heating furnace. The measuring unit 17 comprises a leakage current detector 19 for measuring a current flowing from the earth wire 16 to the earth electrode 18 thereof, and a potential detector 21 for measuring the ground potential at the joint 20 to transformer 14 for RF heating furnace on the earth wire 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulation measuring device for an electric structure, and particularly to a large transformer,
The present invention relates to a device for determining the degree of deterioration of insulation in electric structures such as cubicles and capacitors.

[0002]

2. Description of the Related Art In an electric structure such as a large transformer, cubicle or capacitor, the operation of the electric structure 1 is stopped as shown in FIG. Above, the line terminal 3 of the insulation resistance meter 2 is connected to the electric structure 1, and the line terminal 4 of the insulation resistance meter 2 is connected.
Is generally grounded, and the insulation resistance of the electric structure 1 is measured. As a result, if the insulation resistance value is smaller than that at the beginning, it is generally assumed that the insulation deterioration is advanced. Therefore, the work is mainly performed on holidays and nights when the influence of the operation stop of the electric structure 1 is small.

[0003]

SUMMARY OF THE INVENTION It is inconvenient to measure the insulation property mainly on holidays or at night, and if the insulation deterioration progresses rapidly during operation, it will be dealt with immediately. Since it is impossible, it is also unreliable.
In addition, in electrical structures such as transformers for RF heating furnaces, it may be required to constantly monitor insulation deterioration.

On the other hand, as another judgment method which does not rely on the measurement of the insulation resistance, it is conceivable to measure the leakage current flowing out from the ground wire during operation by a current transformer or the like, but this judgment method is a large electric structure. In the past, inaccuracies in products could not be overlooked. That is, such a large electric structure is fixed to the reinforcing bar in the basic concrete through the anchor bolt because it is necessary to achieve mechanical stability, and a part of the leakage current flows out through the anchor bolt or the reinforcing bar.
This is because the degree of insulation deterioration cannot be determined only by the current value of the ground wire. Further, as the insulation deterioration progresses, the leakage current passing through the reinforcing bar increases, and the obtained data becomes more and more inaccurate, which is not useful.

Therefore, there arises a technical problem to be solved in order to measure the degree of insulation deterioration of the electric structure always and accurately, and the present invention aims to solve the problem. To aim.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above problems, in which the reinforcing bar of the basic concrete is composed of non-conductive reinforced plastic bars, and the reinforced plastic bars are The present invention provides an insulation measuring device for an electric structure, in which an anchor bolt of the electric structure is connected to the electric wire, and a leakage current detector and a potential detector are attached to the ground wire of the electric structure.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, reference numeral 11 is a foundation, and the foundation 11 is a reinforcing plastic reinforcement (hereinafter,
(Referred to as “FRP reinforcement”) 12, the FRP reinforcement 12 is installed on the site, and then the foundation concrete 13 is poured. As the specific material of the FRP muscle 12, an aramid fiber material having high insulation property is used in the present embodiment, but other material may be used as long as it has non-conductivity. Is also good.

It has been clarified by the test data that the FRP reinforcing bar 12 has a tensile strength higher than that of the reinforcing bar. It has sufficient mechanical strength to stably support large electric structures such as vessels. Further, since the FRP muscle 12 has no electrolytic corrosion or corrosion, the mechanical strength does not decrease, and the initial performance can be maintained for a long period of time.

Further, since it is not affected by magnetic induction, it is possible to prevent malfunction of the precision measuring instrument due to residual magnetism. Further, since the FRP muscle 12 is light, it is easy to carry, and in case of rain, etc., it can be assembled indoors with good workability.
You can also carry it to the site manually. Further, not only a linear member, but also an L-shaped member, a T-shaped member, etc. can be easily produced, and by appropriately combining these members, construction can be efficiently carried out.

An RF heating furnace transformer 14 is mounted as a large electric structure on the foundation 11 having the FRP reinforcing bars 12 as reinforcing bars. The RF heating furnace transformer 14 is mounted on the foundation 11.
The anchor bolt 15 is connected and fixed to the FRP muscle 12 in order to prevent the body from falling. And the RF
A measuring device 17 is attached to the ground wire 16 of the heating furnace transformer 14, and the measuring device 17 has a leakage current detector 19 for measuring a current value flowing from the ground wire 16 to the ground electrode 18. A potential detector 21 for measuring the ground potential of the contact point 20 with the RF heating furnace transformer 14 in the ground wire 16 is internally provided. In addition, this measuring device 1
The alarm device 22 is extended from 7.

When the insulation of the RF heating furnace transformer 14 is deteriorated, the RF heating furnace transformer 1 is used.
When the No. 4 is operated, the electric current leaks from the inside. However, since the FRP muscle 12 is non-conductive as described above, the leakage current flows through the anchor bolt 15 to the F bolt.
It does not flow into the RP muscle 12. That is, since the RF heating furnace transformer 14 is electrically completely insulated from the foundation 11, the leak current is entirely grounded through only the ground wire 16. Therefore, the data measured by the leakage current detector 19 directly represents the total leakage current generated from the RF heating furnace transformer 14.

Further, as the insulation deterioration of the RF heating furnace transformer 14 progresses, the amount of leakage current generated during its operation increases. That is, the degree of insulation deterioration is proportional to the leakage current.

Therefore, if the leakage current detector 19 is monitored, the degree of insulation deterioration can be accurately recognized. Moreover, as in the conventional case, it is possible to perform the measurement at any time during the operation, not during the holidays or the night when the operation is stopped. If configured, the alarm device 22
Since it is possible to take immediate action based on the warning sound of, the reliability and safety are improved.

Further, the integrity of the ground wire 16 and its ground electrode 18 can be confirmed by the potential detector 21. That is, it is possible to confirm whether or not the ground is normally established by monitoring the ground wire 16 for disconnection. Further, the potential detector 21 can cancel the variation of the ground resistance based on the variation of the ground condition. By thus additionally providing the potential detector 21 in addition to the leakage current detector 19, the accuracy of the leakage current measurement result can be ensured, and the reliability and safety can be improved as much as possible. become.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0016]

As described above, according to the present invention, the reinforcing bar of the basic concrete of the electric structure is constituted by the non-conductive reinforced plastic bar, and the anchor bolt of the electric structure is connected to the reinforced plastic bar. It is a thing. Therefore, the leakage current generated during the operation of the electric structure due to the deterioration of the insulation of the electric structure cannot flow into the reinforcing bar through the anchor bolt, and the whole amount is grounded from the ground wire. Become.

Therefore, by attaching a leakage current detector to this ground wire, the magnitude of the total leakage current, that is, the degree of deterioration of the insulation of the electric structure can be accurately known. Further, since the deterioration of the insulation property can be constantly monitored, reliability and safety are improved.

Further, by attaching a potential detector to this ground line, it is possible to grasp the state of the ground line and to consider the change in the ground resistance. Since you can guarantee accuracy,
Reliability and safety can be improved as much as possible.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is an explanatory diagram thereof.

FIG. 2 shows a conventional example and an explanatory diagram thereof.

[Explanation of symbols]

 11 Foundation 12 Reinforced Plastic Reinforcement (FRP Reinforcement) 13 Basic Concrete 14 RF Heating Furnace Transformer 15 Anchor Bolt 16 Grounding Wire 17 Measuring Device 18 Grounding Electrode 19 Leakage Current Detector 21 Potential Detector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000001085 Kuraray Co., Ltd. 1621 Sakata, Kurashiki City, Okayama Prefecture (71) Applicant 000183325 Sumitomo Construction Co., Ltd. 13-13 Arakicho, Shinjuku-ku, Tokyo (71) Applicant 000003001 Teijin 1-6-7 Minamihonmachi, Chuo-ku, Osaka-shi, Osaka (71) Applicant 591253135 DuPont Toray Kevlar Co., Ltd. 1-5-6 Nihonbashihonmachi, Chuo-ku, Tokyo (71) Applicant 000219875 Tokyu Construction Co., Ltd. Company Shibuya, Shibuya, Tokyo 1-16-14 (71) Applicant 000140982 Mazumagumi Co., Ltd. 2-5-8 Kitaoyama, Minato-ku, Tokyo (71) Applicant 000000549 Obayashi Corporation 4 Kitahama Higashi, Chuo-ku, Osaka-shi, Osaka No. 33 (71) Applicant 394017251 Director, Ministry of Construction Architectural Research Institute, Tsukuba City, Ibaraki Prefecture (71) Applicant 000141060 Kanden Co., Ltd. Engineering 4-83-3 Shibaura, Minato-ku, Tokyo (72) Inventor Keinao Okawa 1-chome, 80-1, Mukaiyama, Naka-cho, Naka-gun, Naka-gun, Ibaraki Prefecture (72) In-house Naka Institute, Japan Atomic Energy Research Institute (72) Yoichi Kana, Naka-gun, Ibaraki Prefecture Nakacho, Oita, Mukaiyama, 801 No. 1 at the Japan Atomic Energy Research Institute, Naka Research Institute (72) Inventor Masaki Tsuneoka, Ibaraki Prefecture, Naka-machi, Nakamachi, Nakamachi, Japan No. 80-1, Komuyama, Japan Atomic Energy Research Institute Naka Research Institute (72) Inventor Takehiko Kato, Ibaraki Prefecture Tsukuba City Oigaikekubo Shimoyama 1043-1 Kumagai Gumi Technology Research Institute Co., Ltd. (72) Inventor Shigeichiro Omomo Tsukuba City Okiigaboji Shimoyama 1043-1 Kumagaya Gumi Technology Research Co., Ltd. (72) Inventor Moriya Toshio Tokyo 3-10-1 Iwamotocho, Chiyoda-ku Mitsui Construction Co., Ltd. (72) Inventor Toshihiko Nishio 518-1 Komagaki Nagareyama City, Chiba Mitsui Construction Co., Ltd. Technical Research Institute (72) Inventor Tadashi Fujisaki Minato-ku, Tokyo Shibaura 1-2-3 Shimizu Construction Co., Ltd. (72) Invention Yoshihiko Kawamura 3-8-2 Nihonbashi, Chuo-ku, Tokyo Inside Kuraray Co., Ltd. (72) Inventor Yoshitsugu Higuchi 13-4 Arakicho, Shinjuku-ku, Tokyo (72) Inventor Masaya Kamiyoshi 2-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo -1 Teijin Limited Company Tokyo Head Office (72) Inventor Atsushi Kakuda 2-7-1 Hirakawa-cho, Chiyoda-ku, Tokyo (72) Inventor Akihiro Kikuchi 1-16-14 Shibuya, Shibuya-ku, Tokyo Tokyu Construction Co., Ltd. (72) Inventor Akihisa Hara 2-5-8 Kita-Aoyama, Minato-ku, Tokyo Intra-company group (72) Inventor Sasaki Tsutomu 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office ( 72) Inventor Yasuyuki Yamauchi 1st Tatehara, Tsukuba City, Ibaraki Prefectural Building Research Institute (72) Inventor Hiroshi Fukuyama 1st Tsukuba City, Ibaraki Prefectural Building Research Institute (72) Inventor Yoshino Murano Chiba Chiba 2-1-24, Shinjuku, Chuo-ku, Kanagawa Electric Works Chiba Branch

Claims (1)

[Claims] 1. Reinforcement reinforcement of basic concrete is composed of non-conductive reinforcement plastic reinforcement, and anchor bolts of an electric structure are connected to the reinforcement reinforcement reinforcement, and further,
An insulation measuring device for an electric structure, wherein a leakage current detector and a potential detector are attached to a ground wire of the electric structure.