JP2920476B2 - Termination connection or termination structure for high voltage bypass cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal connection section or a terminal processing section structure for a high-voltage bypass cable, and more particularly, to an insulation section in a direct connection type cable terminal connection section due to adhesion of moisture during work in rain. The present invention relates to a high-voltage bypass cable terminating connection or terminal processing unit structure capable of preventing a decrease in insulation resistance of a high-voltage bypass cable and thereby confirming the presence or absence of a voltage in a line or a circuit even during rain.

[0002]

2. Description of the Related Art At present, it is called an electrified society, and there is a social demand for performing electric work without power outages. For this reason, a so-called bypass construction using a temporary electric line such as a bypass cable is performed in the electric construction. For this bypass work, a high-pressure bypass cable having a direct connection type cable terminal connection portion having a power detection mechanism is used for safety.

[0003] The direct connection type cable connecting portion having the above-mentioned voltage detection mechanism is often used for cables used for temporary electric lines such as a high-voltage underground electric line and a high-voltage bypass cable. Can be confirmed by a low-voltage detector. Confirmation of the presence or absence of a voltage at the end of the direct connection type cable is made by burying the electrode at an appropriate position in the insulator within the electric field between the conductor and the ground, and detecting the voltage divided from this with a low voltage detector. Is being done.

FIG. 3 shows a conventional direct connection type cable connection portion having a power detection mechanism. In FIG. 3, reference numeral 100 denotes a conductor formed in an L shape, and an insulator 1 made of ethylene propylene rubber.
01. An electrode 102 is buried above the outer peripheral surface of the insulator 101. A low-voltage detector is connected to the electrode 102 so that the presence or absence of a voltage can be detected. By detecting the presence or absence of a voltage, it is possible to determine whether the high-voltage bypass cable is in a live state or in a power failure state. .

[0005] The above-described conventional voltage detecting mechanism has a structure in which a voltage detecting electrode is buried in an insulator of ethylene propylene rubber used as a material for a high-voltage cable connecting portion. When placed in an atmosphere of high humidity in the rain or in a manhole, there is a problem that the impedance between the electrode and the ground fluctuates, and the voltage cannot be detected by the low-voltage detector. In other words, the cause of the fluctuation in the impedance between the electrode and the ground is a fluctuation in the insulation resistance between the electrode and the ground. The partial pressure becomes low, and the voltage cannot be detected. However, as described above, since it is necessary to perform work regardless of the presence or absence of rain due to demand for power demand, work is being performed in an unsafe state in which power detection is not performed reliably, and electric shock and other There was a problem that caused an accident.

[0006]

An object of the present invention is to use a material excellent in water repellency and surface wetting prevention for an insulator in which an electrode is buried so as to prevent a decrease in insulation resistance due to adhesion of water and to maintain a high resistance. It is another object of the present invention to provide a high-voltage bypass cable terminal connection section or terminal processing section structure capable of detecting electric power.

[0007]

The structure of the invention adopted to achieve the above object is as follows. According to a first aspect of the present invention, there is provided a terminal connection portion or terminal treatment portion structure for a high-voltage bypass cable, wherein the conductor, an internal semiconductive layer and an insulating layer covering the conductor, and a surface of the insulating layer On the side, silico
Water repellency or wetting prevention using rubber or fluororesin
An insulator layer which has been subjected to, are embedded in the insulating layer,
An electrode for detection whose contact portion is exposed from the surface of the insulator layer, and a protective case containing the conductor, the inner semiconductive layer and the insulating layer, the insulator layer, and the electrode for detection, The protection case is a structure of a terminal connection portion or a terminal treatment portion for a high-voltage bypass cable, which is provided with a coating cover that covers or exposes the detection electrode.

According to a second aspect of the present invention, there is provided the first aspect of the present invention, wherein the voltage detection electrode has a swingable contact urged toward the coating cover at a tip end thereof. It is a terminal connection section or a terminal processing section structure for a high-pressure bypass cable.

According to a third aspect of the present invention, there is provided a high-voltage bypass cable according to the first or second aspect, wherein a plurality of detection electrodes are provided at predetermined intervals in a circumferential direction of the insulator layer. Terminal connection section or terminal processing section structure.

Operation When the surface of the insulator layer is wet in rain or high humidity, the electric resistance becomes extremely small, and the potential becomes almost the same as the edge of the electrode for voltage detection. However, in the present invention, in order to prevent the insulation resistance from lowering due to the adhesion of moisture, the insulating layer in which the detection electrode is buried is used to prevent water absorption and surface wetting by using silicon rubber or fluorine resin having excellent water repellency. Prevention and high resistance during rain can be maintained. Therefore, even in the rain, electricity can be detected to prevent moisture from adhering to the surface of the insulator layer and prevent a decrease in insulation resistance.

It is convenient to form the test electrode in a ring shape or to provide a plurality of test electrodes in the circumferential direction (for example, at four locations) so that the test operation can be performed from any direction.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention.
FIG. 2 is a partially cutaway side view showing a state in which the detection electrode is covered with the covering cover. FIG. 2 shows the embodiment shown in FIG. It is a partially broken side view showing a state where it is.

The terminal connection or terminal processing structure is provided at one end of the high-voltage electric cable C. The terminal connection portion or terminal treatment portion structure includes a protective case 1 made of an aluminum alloy having a circular cross section. A cap nut 11 for terminal connection is rotatably attached to the distal end side of the protective case 1. The protective case 1 has a conductor 2 of the high-voltage electric cable C. An inner semiconductive layer 3 made of semiconductive rubber is provided around the conductor 2. An insulating layer 4 made of ethylene propylene rubber is provided in a laminated state around the inner semiconductive layer 3.

Further, an insulating layer 5 made of silicon rubber and having water repellency is provided on the outer periphery of the central portion of the insulating layer 4. The insulating layer 4 and the insulating layer 5 are not integrally formed, but only the insulating layer 5 is formed of silicon rubber, and is fitted on the outer peripheral surface of the insulating layer 4 later. Copper insulating electrodes 6, 6, 6, 6 which are electrically connected to each other are buried in the insulator layer 5 at equal intervals at four locations. Plate-shaped contacts 60, 60, 60 having spring elasticity are provided at the distal ends of the detection electrodes 6, 6, 6, 6.
60.

The outer peripheral surface of the insulator layer 5 is covered with a sealing cover 7. The sealing cover 7 has window holes 70, 70, 7 at regular intervals.
0, 70 are formed, and window holes 70, 70, 70, 7
From 0, the detection electrodes 6, 6, 6, 6 are exposed. In order to prevent rainwater or the like from entering between the insulating layer 4 and the insulating layer 5, O-ring-shaped projections are provided on both side surfaces of the insulating layer 5, and the side surfaces of the front and rear protective cases are fitted to each other. And have a watertight structure.

Reference numeral 12 denotes a cover for covering the detection electrodes 6, 6, 6, 6. The cover 12 advances and retreats in the axial direction (the left-right direction in the figure). In a normal state, the electrodes 6, 6, 6, 6 are urged by the coil spring S (exposing 6) in a direction to expose the electrodes 6. The covering cover 12 has a hooking means (not shown), and can be hooked and fixed to the protective case 1 by rotating it 1/4 in the circumferential direction in a state in which the electrodes for detection 6, 6, 6, 6 are covered. ing. The covering cover 12 usually covers the electrodes for electric detection 6, 6, 6, 6 and exposes the electrodes 6, 6, 6, 6 at the time of electric power detection.

The electrodes for electric detection 6, 6, 6,
6 are covered with the contacts 60, 60, 60, 6
Numeral 0 is in contact with the inner surface of the cover 12 to prevent occurrence of partial discharge.

(Operation) The operation of this embodiment will be described with reference to the drawings. Usually, the detection electrodes 6, 6, 6, 6 are covered with a cover 12. In the case of performing power detection, when the cover 12 is turned in the direction opposite to the hooked state, the hooked state with the protective case 1 is released, and the electrodes 6, 6, 6, 6 are exposed by the spring force of the coil spring. Move in the direction you want. Then, the low-voltage detector is brought into contact with any one of the electrodes 6, 6, 6, 6 for power detection to perform power detection.

Even in the event of a power detection operation in the rain or in an atmosphere of high humidity, the insulating layer 5 in which the power detection electrodes 6, 6, 6, 6 are buried has water repellency, so that moisture such as raindrops may be present. Cannot be attached. Therefore, the insulation resistance of the insulator layer 5 does not decrease, and the impedance between the detection electrode and the ground does not fluctuate, so that the partial pressure to the detection electrode does not decrease. .

EXPERIMENTAL EXAMPLE The terminal connection or terminal treatment structure of the embodiment shown in FIGS. 1 and 2 and the conventional terminal connection or terminal treatment structure shown in FIG. 3 are dried and filled. An operation check test was performed in (1) Voltage detector operation confirmation test <Method> In the dry state, connect AC 3800 to the cable conductor.
V is applied, and the quality of the detector operation at the time of detecting the voltage at each terminal is checked. <Measuring device> The following were used as measuring devices. High / low voltage detector HSA-7 type (80 to 7000V AC) Hasegawa Electric Industries Low voltage display start voltage: AC65V ± 15V, High voltage display start voltage: AC300V ± 50V Low voltage detector HT-600 (MAX, AC600V) Hasegawa Electric Manufacture GS tester for construction HPL-6C (AC80-600V) Manufactured by Hasegawa Electric Industries (for low pressure) Test results are shown in Table 1. As is clear from Table 1, the operation of the equipment in the dry state is different between the terminal connection part or terminal processing part structure of the embodiment and the conventional terminal connection part or terminal processing part structure (indicated as a current product in the table). All were good.

[Table 1]

(2) Voltage detector operation confirmation test <Method> In a state of water injection, AC 3800 was applied to the cable conductor.
V is applied, and the quality of the detector operation at the time of detecting the voltage at the detection terminal is checked. Table 2 shows the test results. As is evident from Table 2, the terminal connection part or the terminal processing unit structure of the embodiment did not hinder the operation even in the water injected state, but the conventional terminal connection part or the terminal processing unit structure operates in the water injected state. Did not.

[Table 2]

[0022]

The present invention has the above-described configuration and produces the following effects. (1) Reliable and reliable power detection can be performed even during work such as during rainfall, greatly affecting work safety. (2) By providing a plurality of electrodes for voltage detection, voltage detection work can be performed from any direction.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a partially broken side view showing a state where a detection electrode is covered with a covering cover.

FIG. 2 is a partially cutaway side view of the embodiment shown in FIG. 1, showing a state in which a covering cover has been moved to the distal end side to expose a voltage detection electrode.

FIG. 3 is a partially cutaway side view showing a conventional terminal connection portion or terminal treatment portion structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protective case 2 Conductor 3 Inner semiconductive layer 4 Insulating layer 5 Insulating layer 6 Electrode for detection electrode 12 Covering cover 60 Contact

Continuing from the front page (72) Inventor Eiichiro Tamura 1-115, Kamitenmacho, Nishi-ku, Hiroshima City, Hiroshima Prefecture Inside Chudenko Co., Ltd. (72) Inventor Yuichi Asahizume 1-15, Kamitenma-cho, Nishi-ku, Hiroshima-shi, Hiroshima Chuko Development Co., Ltd. (72) Inventor Seiji Inoue 660 Minamicho, Kurume-shi, Fukuoka Daiden Co., Ltd. (72) Inventor Kazushige Moriyama 660 Minami-cho, Kurume-shi, Fukuoka Daiden Co., Ltd. (56) Reference 2-30228 JP, U (JP)

Claims (3)

(57) [Claims] 1. A high-voltage bypass cable terminal connection or terminal treatment structure comprising: a conductor (2); an inner semiconductive layer (3) covering the conductor (2); and an insulating layer (4). ) And silicon rubber provided on the surface side of the insulating layer (4).
Water-repellent or wet-proof using
Insulator layer (5), the insulating layer (5) is embedded in the contact portion insulator layer electroscopic electrode exposed from the surface of (5) (6,6,
6, 6), the conductor (2), the internal semiconductive layer (3), and the insulating layer (4)
And a protective case (1) containing the insulator layer (5) and the voltage detection electrode (6, 6, 6, 6). The protection case (1) is provided with the power detection electrode (6). , 6,
6. A terminal connection or termination structure for a high-pressure bypass cable, comprising a covering cover (12) covering or exposing 6, 6). 2. The electrode (6, 6, 6, 6) for voltage detection has contacts (60, 60, 60, 60) oscillating at the tip thereof urged toward the cover (12). The terminal connection part or terminal processing part structure for high voltage bypass cables according to claim 1, characterized in that: 3. A plurality of electrodes for electric detection (6, 6, 6, 6) are provided at required intervals in a circumferential direction of the insulator layer (5).
The terminal connection section or terminal processing section structure for a high-pressure bypass cable according to claim 1 or 2.