JP2891587B2 - Lightning disconnection prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning disconnection prevention device which is mounted on a pole to short-circuit a line in the event of a lightning strike, thereby preventing the line from breaking due to a continuation current.

[0002]

2. Description of the Related Art If a distribution line or the like is disconnected due to a lightning strike, it takes a long time to restore the power supply, and a long-term power outage is inevitable. A lightning-break prevention device designed to cut off light is being studied. However, in the past, such a lightning disconnection prevention device has not been specifically designed based on theoretical research alone, and there is no lightning disconnection prevention device that can be used by mounting it on a pillar exposed to the natural environment. Was not known.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and the high-voltage switching circuit and the low-voltage control unit are liable to malfunction or malfunction due to moisture entering from the outside even when installed in a natural environment. It is an object of the present invention to provide a lightning disconnection prevention device in which a low-voltage control unit is not affected by a high voltage flowing in a high-voltage switching circuit and malfunctions due to electric influence.

[0004]

Means for Solving the Problems According to a first aspect of the present invention, a bottomless case is assembled on a gantry via a packing, and the inner bottom of the case is completely assembled.
A low-voltage control unit that controls the high-voltage switching circuit is housed by covering the upper surface with a shield plate, and a high-voltage switching circuit that opens and closes the distribution line is housed above the shield plate in this completely sealed case. Further, an opening / closing lid for operating the control unit is provided at the bottom of the completely sealed case. According to a second invention for solving the same problem, a high-voltage switching circuit for opening and closing a distribution line is housed in a completely closed bottomed case, and a lightning strike occurs.
When a low-voltage control unit for controlling this high-voltage switching circuit is controlled via a shielded cable, a shield case containing the low-voltage control unit is attached to the side or bottom of the completely sealed case. A lid is provided.

[0005]

The lightning disconnection prevention device of the present invention is mounted on a pole, and a distribution line is connected to a high-voltage switching circuit in a completely sealed case via a bushing. The high voltage switching circuit is operated to short-circuit the line, thereby preventing the line from being broken due to the follow-up current. In particular, in the first invention, the high-voltage switching circuit is housed in a completely hermetically sealed completely sealed case, and the opening / closing lid for operating the control section is provided at the bottom of the completely hermetically sealed case with hermeticity. Therefore, moisture does not intrude from the opening / closing lid, and the high-voltage switching circuit does not malfunction. In addition, since the high-voltage switching circuit and the low-voltage control unit are separated by a shield plate, the high-voltage switching circuit is high despite the fact that the control unit and the high-voltage switching circuit are housed in a small, completely sealed case close to each other. The control unit is not electrically affected by the high voltage of the voltage switching circuit.

In the second invention, since the high-voltage switching circuit is housed in a completely hermetically sealed case, the high-voltage switching circuit does not malfunction due to moisture. Also seals when lightning strike is detected
The low-voltage control section that controls the high-voltage switching circuit via the cable is housed in a sealed case that has a shielding property, so that the control section can be easily inspected. The voltage controller is not electrically affected. Further, even if the opening / closing lid for operating the control unit provided in the sealed case having the shielding property is opened, the inside can be kept sealed.

[0007]

Embodiments of the present invention will be described below. FIG. 1 shows an embodiment of the first invention. Reference numeral 1 denotes a completely sealed case in which the internal humidity is kept below a predetermined value by a desiccant sealed inside to prevent dew condensation. It is assembled from a gantry 2, a bottomless case body 3, and an upper lid 3a. The assembling joint surfaces 5 of the gantry 2, the case body 3, and the upper lid 3a are horizontal surfaces, and the packing 4 is sandwiched between the assembling joint surfaces 5. It completely prevents moisture.

Reference numeral 6 denotes an opening / closing lid for operating a control unit provided at the bottom of the completely sealed case 1. Reference numeral 7 denotes a low voltage control unit for controlling a high voltage switching circuit 8 housed in the inner bottom of the completely sealed case 1. The control unit 7 has a high-voltage switching circuit 8 whose upper surface is covered with a shield plate 9.
It is not electrically affected by the high voltage flowing through it. The high-voltage switching circuit 8 housed in the upper part of the completely sealed case 1 is connected to the drawn distribution line via the bushing 10 attached to the case main body 3, and short-circuits the distribution line when lightning strikes.

The lightning disconnection prevention device according to the first aspect of the present invention is used by being mounted on a pole as described above. The distribution line is drawn into the completely sealed case 1 via the bushing 10. In addition, it is connected to the high-voltage switching circuit 8, and when a lightning strike occurs, the high-voltage switching circuit 8, which is operated by the control unit 7 that detects the lightning strike, short-circuits the distribution line and accurately detects the disconnection due to the continuation current. It is to prevent.

Particularly, in the first invention, the high-voltage switching circuit 8 is housed in the completely sealed case 1 and the opening / closing lid 6 for operating the control unit is provided at the bottom of the completely sealed case 1. Water does not enter from the opening / closing lid 6 portion, and the high-voltage switching circuit 8 does not malfunction. Also, since the high-voltage switching circuit 8 and the low-voltage control unit 7 are partitioned by the shield plate 9,
Even though the control unit 7 and the high-voltage switching circuit 8 are housed in a small, completely sealed case 1 that is close to each other, the control unit 7 is electrically affected by the high voltage flowing through the high-voltage switching circuit 8. There is no.

Next, the second invention will be described in detail based on the embodiment of FIG. Reference numeral 20 denotes a completely sealed case. The completely sealed case 20 includes a case body 23 having a bottom and an upper lid 23a.
And more assembled. Upper lid 23a and case body 23
Each assembly joint surface 25 is horizontal, and a packing 24 is interposed between the assembly joint surfaces 25 to completely prevent moisture such as rainwater from entering from the assembly joint surface 25 to take in the inside. In.

Reference numeral 28 denotes a high-voltage switching circuit housed in the completely sealed case 20. As in the first embodiment, the high-voltage switching circuit 28 is a distribution line drawn in through a bushing 30 attached to the case body 23. To short-circuit the distribution line during a lightning strike.

Reference numeral 31 denotes a hermetically sealed shield case attached to the outer side surface or the bottom surface of the completely sealed case 20,
The shield case 31 houses a low-voltage control unit 27 for controlling the high-voltage switching circuit 28 when a lightning strike is detected . Reference numeral 26 denotes an opening / closing lid provided for the sealed shield case 31 for operating the control unit. The mounting position of the opening / closing lid 26 may be a position at which work on the pillar is easy. Reference numeral 32 denotes a shielded cable for connecting the control unit 27 and the high-voltage switching circuit 28.

The lightning disconnection prevention device of the second invention thus constructed is also mounted on a pole and used similarly to the first invention. In particular, in the second invention, the high-voltage switching circuit 28 for opening and closing the distribution line is housed in the bottomed completely sealed case 20, so that the sealing surface is reduced as compared with the structure of the first invention. Thus, the high voltage switching circuit 28 can be more reliably protected from moisture.

Further, since the low-voltage control unit 27 is housed in the shield case 31 and attached to the outer surface or the bottom surface of the completely sealed case 20, the assembling process is simplified and the control unit 27 can be easily replaced on site. Becomes In addition, the low-voltage control unit 27 does not malfunction due to being electrically affected by the high voltage of the high-voltage switching circuit 28. Further, the position where the opening / closing lid for operating the control unit is provided can be set to the position where the work on the pillar is the easiest, and the internal seal can be maintained even when the opening / closing lid is opened. The operability can be further improved than that of the above.

[0016]

As described above, the lightning disconnection prevention device of the present invention can be reliably mounted on a pole exposed to the natural environment to prevent disconnection of a line due to lightning strike, and is a new and unprecedented device. The device that contributes to industrial development as a lightning disconnection prevention device is extremely large.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the first invention.

FIG. 2 is a perspective view showing an embodiment of the second invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Completely sealed case 2 Stand 4 Packing 6 Opening / closing lid 7 Control part 8 High voltage switching circuit 9 Shield plate 20 Fully sealed case 24 Packing 26 Opening / closing lid 27 Control part 28 High voltage switching circuit 31 Shield case 32 Shield cable

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshikatsu Iwai 5-339, Awano Nishi, Gifu City, Gifu Prefecture (72) Inventor Hiroshi Yamada 2--21, Ishibutsu-cho, Showa-ku, Nagoya-shi, Aichi Prefecture (56) References JP Showa 61-99226 (JP, A) Actually open Showa 63-17516 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 7/00-7/22

Claims (2)

(57) [Claims] 1. A low-voltage control unit for controlling a high-voltage switching circuit is housed in an inner bottom portion of a completely sealed case in which a bottomless case is assembled via a packing on a base with its upper surface covered by a shield plate. A high-voltage switching circuit for opening and closing a distribution line is housed above a shield plate in the completely sealed case, and an opening / closing lid for operating a control unit is provided at the bottom of the completely sealed case. Lightning disconnection prevention device. 2. A high-voltage switching circuit for opening and closing a distribution line is housed in a completely sealed case with a bottom to prevent lightning strikes.
At the time of detection, a shield case accommodating a low-voltage control unit for controlling the high-voltage switching circuit via a shielded cable is attached to the side or bottom surface of the completely sealed case. A lightning disconnection prevention device, characterized by comprising: