JPH0926442A - Voltage detecting device of power distribution line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute voltage detecting operation without separating a switching lid, prevent the switching lid from being lost, and at the same time, simplify the switching lid attaching/detaching operation when detecting voltage. SOLUTION: The voltage detecting device has an insulation protruding part 21 arranged at an insulation part 12 so that it protrudes, a shield part 22 which is arranged at the outer periphery part of the insulation protruding part 21, a switching lid 23 which is mounted to the shield part 22 via a connecting means, and an electrode 24 for detecting voltage being arranged on the surface of the insulation protruding part 21, causes the switching lid 23 to be attached/ detached while it is being supported, and exposes the electrode 24 for detecting voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution line detection device, and more particularly to a technique for facilitating determination of whether or not a power is applied to a power distribution line.

[0002]

2. Description of the Related Art FIG. 5 shows a structural example in which an electric cable (for example, a high-voltage underground cable) 2 and a high-electric equipment 3 are connected by a detachable branch connector (for example, a load break elbow) 1. The detachable branch connector 1 can be separated into a fixed portion A and a detachable portion B, and has an L-shaped electric conductor 11 and an insulating portion 12 that covers the electric conductor 11.
A part of the surface is buried in the insulating part 12 so as to be exposed to the outside, and is attached to the electric conductor 11 so as to always cover the detection electrode 13 in an electrostatically coupled state and the exposed part of the detection electrode 13. And a cap 14.

As a technique for determining whether or not the power distribution line having such a detachable branch connector 1 is being charged (whether or not it is in a live state), a cap 14 is removed and a neon lamp type is used. A general method is to bring the tip of the electroscope into contact with the detection electrode 13 and determine whether or not the neon lamp emits light. When the earth voltage: E is applied to the electric conductor 11, the potential difference (applied voltage): e generated between the detection electrode 13 and the ground conductor 15 shown in FIG. Assuming that there is, the capacitance between the electric conductor 11 and the detection electrode 13: C ₁ and the capacitance between the detection electrode 13 and the ground conductor 15: C ₂ Desired. e = E {C ₁ / (C ₁ + C ₂ )}

[0004]

However, when the voltage is detected by the voltage detector, the cap 14 is attached to the detachable branch connector 1.
It is necessary to remove the detection electrode 13 to expose the detection electrode 13 and to confirm the presence or absence of electricity application using a voltage detector or the like. After confirming the presence or absence of electricity application, it is necessary to attach the cap 14 to the detachable branch connector 1 again. Will be accompanied. Therefore, when the installation environment of the detachable branch connector 1 is a narrow space or the like, the workability of attaching / detaching the cap 14 or the workability of contacting the detection electrode 13 with a voltage detector or the like for confirmation is likely to be impaired, and It is necessary to manage the removed cap 14 so as not to be lost or damaged.

[0005] The present invention has been made in view of the above-mentioned circumstances, and achieves the following objects. Preventing the loss of the open / close lid by enabling the voltage detection work without separating the open / close lid. To simplify the work of attaching / detaching the open / close lid during voltage detection. There is no need to prepare special tools for attaching / detaching the open / close lid. Minimize the location of voltage detection.

[0006]

A detection electrode embedded in an insulating portion of a distribution line and electrostatically coupled to an electric conductor, an insulating projection portion integrally projecting with the insulating portion, and the insulating projection. A shield part arranged around the outer peripheral part of the part, an opening / closing lid attached to the shield part through a connecting means to expose the outer surface of the insulating protrusion part, and a surface of the insulating protrusion part. A technique is employed in which the detection electrode is provided in an exposed state and the detection electrode is connected to the detection electrode. The connecting means includes a rotating shaft that rotatably supports the opening / closing lid with respect to the shield portion, and a concave-convex fitting portion that is arranged at a joint portion between the shield portion and the opening / closing lid and suppresses movement of the opening / closing lid at the time of engagement. Technology is adopted. An elastic member for strengthening the contact between the shield part and the opening / closing lid is arranged near the rotating shaft in the connecting means. It is desirable that the open / close lid is in contact with the electrode for detection and grounded when the electrode for detection is closed. As connecting means, a flexible connecting body that connects the shield part and the opening / closing lid so as to be movable relative to each other, and a member arranged at a joint part between the shield part and the opening / closing lid to restrain movement of the opening / closing lid when engaged. A technique having a joint is adopted.

[0007]

[Function] When the electric conductor in the power distribution line is in a charged state, the divided potential is applied to the detection electrode in the electrostatic coupling state with respect to the electric conductor, and the divided potential is applied to the detection electrode. Although it is guided, when the opening / closing lid is closed, the voltage detection electrode is covered, and the opening / closing lid is in contact with the voltage detection electrode and grounded via the connecting means and the shield part. As a result, the state in which it is not possible to detect the presence / absence of the power distribution line is held. When the opening / closing lid is opened, the opening / closing lid exposes the voltage detection electrode, and the opening / closing lid is separated from the voltage detection electrode, and the voltage division potential of the detection electrode is applied to the voltage detection electrode, It becomes possible to detect the presence / absence of electricity on the distribution line. The relative rotation of the opening / closing lid is performed in a state of being supported by the rotating shaft, and the relative rotation position of the opening / closing lid is set by the engagement of the concave-convex fitting portion, and the movement is suppressed. When the opening / closing lid is attached to the shield part by the engaging portion, by removing the opening / closing lid, the electrode for electrolysis is exposed, and the removed opening / closing lid is supported by the connecting body and separated. It is possible to carry out the electric power detection work without the need.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a power distribution line detecting apparatus according to the present invention will be described below with reference to FIGS. 1 and 2. 1 and 2, reference numeral 21 is an insulating protrusion, 22 is a shield portion, 23 is an opening / closing lid, 24 is an electrode for electric detection, 25 is a connecting means, and D is a voltage detector.

The distribution line detecting device comprises a detachable branch connector 1 or an electric cable 2 which constitutes the distribution line.
Of the above-mentioned detection electrode 13 embedded in the insulating portion 12 and being electrostatically coupled to the electric conductor, the insulating protrusion 21 disposed integrally with the insulating portion 12 in a protruding state, and the base portion of the insulating protrusion 21. The above-mentioned ground conductor 15 which is integrally arranged in the vicinity, the shield portion 22 which is arranged on the outer peripheral portion of the insulating protrusion portion so as to surround the same, and the insulating protrusion portion 21 which is attached to the shield portion 22 when opened. An opening / closing lid 23 that exposes the outer surface, and an electrode 24 for electric detection that is disposed on the surface of the insulating protrusion 21 in an exposed state
And a connecting means 25 for rotatably supporting the opening / closing lid 23 with respect to the shield part 22 are applied.

The shield portion 22 is made of a conductive material such as conductive rubber or metal, and is integrally formed with the outer peripheral portion of the ground conductor 15 and the insulating protrusion 21 as shown in FIGS. In addition, the inward flange 22a is disposed at the outer end portion, and the installation height of the inward flange 22a is set according to the voltage detection electrode 24.

The opening / closing lid 23 is made of a conductive material such as conductive rubber or metal, and as shown in FIGS. 1 and 2, the opening / closing lid 23 is connected to the inward flange 22a of the shield portion 22 via a connecting means 25. And a knob 23a is arranged at a position opposite to the center of rotation.

A bolt, for example, is applied to the voltage detection electrode 24, and the voltage detection electrode 24 is screwed into the voltage detection electrode 24 and is arranged so as to project outward through the insulating protrusion 21.

The connecting means 25 is provided with a rotary shaft 25a for rotatably supporting the opening / closing lid 23 with respect to the inward flange 22a, and a shield portion 22 arranged near the rotary shaft 25a.
And the lid 23 are brought into close contact with each other (the contact is strengthened).
And an elastic member 25b such as a tension spring.

The joint portion between the shield portion 22 and the opening / closing lid 23 is engaged with each other to form the opening / closing lid 23.
An uneven fitting portion 26 made of a combination of uneven portions for suppressing the rotational movement of the is arranged.

The power distribution line detecting device thus configured contacts the opening / closing lid 23 and the inward flange 22a of the shield portion 22 in the state shown in FIG. 1 when the power detecting operation is not performed. Then, the concavo-convex fitting portion 26 is used in a rotation-inhibited state by the engagement of the concavo-convex portion. In such a state of use, the open / close lid 23 is used to open the electrode 24 for detection of electricity.
The cover 23 is covered, and the opening / closing lid 23 comes into contact with the voltage detection electrode 24, whereby the connecting means 25 and the shield part 22 are provided.
The voltage detection electrode 24 is grounded via the power supply, and the divided potential is 0 regardless of whether or not the electric conductor 11 (see FIGS. 5 and 6) in the distribution line is in the power-applied state. Therefore, the state in which it is impossible to detect the presence or absence of electric power on the distribution line is maintained.

On the other hand, by operating the knob 23a, the opening / closing lid 2
When 3 is rotated to be in the open state, the opening / closing lid 23 exposes the outer surface of the electrode 24 for electric power detection, and the opening / closing lid 23
When the electric conductor 11 in the distribution line is in a voltage-applied state, the detection electrode 13 that is in an electrostatically coupled state with respect to the electric conductor 11 will be detected. The divided potential is applied, and it becomes possible to detect whether or not the distribution line is charged. Therefore, as shown in FIG. 2A, by contacting the outer surface of the electrode 24 for detection with the voltage detector D, it is possible to detect whether or not the power is applied to the distribution line.

Further, when the opening / closing lid 23 is opened, the relative rotational position of the opening / closing lid 23 is set by the engagement of the uneven portion of the uneven fitting portion 26, so that the rotational movement is suppressed, The state where the outer surface of the detection electrode 13 is exposed is held.

Next, FIGS. 3 and 4 show a second embodiment of the distribution line power detection apparatus according to the present invention. The second
In the embodiment, instead of the rotating operation of the first embodiment, the opening / closing lid 23 adopts an opening / closing method by fitting, and the shield part 22 and the opening / closing lid 23 are connected as the connecting means 25 so as to be relatively movable. And flexible cord-like connector 25A
, And an engaging portion 25B which is arranged at the joint between the shield portion 22 and the opening / closing lid 23 and which is a combination of an annular protrusion and an annular groove for restraining the opening / closing lid 23 from coming out when engaged. In addition, the amount of outward projection of the electrode 24 for detection of electricity is set to be smaller than that of the opening edge of the shield portion 22, and the thickness of the relay electrode 27 causes the inner surface of the opening / closing lid 23 when closed by the opening / closing lid 23. Is set so that the head of the electrode 24 for electric detection contacts.

Then, as shown in FIG. 3, when the opening / closing lid 23 is attached to the shield portion 22 by the engaging portion 25B and covers the voltage detection electrode 24, the opening / closing lid 23 is attached to the voltage detection electrode 24. The contacting and grounding state is maintained because the engaging portion 25B is in the engaging state.

On the other hand, when carrying out the voltage detection work, the opening / closing cover 23 is opened by pulling up the knob 23a, and the voltage detecting electrode 24 is exposed by removing the opening / closing cover 23 as shown in FIG. Performed as a state. When the opening / closing lid 23 is separated from the power detection electrode 24, when the power distribution line is in the power-on state, as described above, the detection electrode 1
Since a partial voltage potential is applied to 3 and it becomes possible to detect the presence / absence of voltage application to the distribution line, by contacting the outer surface of the electrode 24 for voltage detection with the voltage detector D as shown in FIG. It is possible to detect the presence / absence of power distribution line distribution. At this time, since the opening / closing lid 23 is connected to the shield part 22 by the connecting body 25A, the opening / closing lid 23 is not lost.

[0021]

According to the present invention, there is provided an electric power detecting apparatus for a power distribution line in which an insulating protrusion is provided in a protruding state on an insulating portion, a shield portion is provided on an outer peripheral portion of the insulating protrusion, and the shield portion is provided on the shield portion. Adopting a technique including an opening / closing lid attached via a connecting means and an electrode for voltage detection arranged on the surface of the insulating protrusion has the following effects. (1) The opening / closing lid is supported by the connecting means and the opening / closing lid is not separated. By opening the opening / closing lid, the power detection operation can be performed, and the opening / closing lid can be prevented from being lost. (2) By rotating or prying the opening / closing lid, the electrodes for electric detection are exposed, and the opening / closing lid attaching / detaching work at the time of electric power detection in the narrow space can be simplified and surely performed. (3) Since the opening / closing lid can be opened / closed by rotating or prying operation, there is no need to prepare a special tool for attaching / detaching the opening / closing lid. (4) Since the operation space is reduced by opening and closing the opening / closing lid by a simple operation such as rotation, it is possible to reduce the size of the power detection part and the power detection device.

[Brief description of drawings]

1A and 1B show a first embodiment of a distribution line power detection device according to the present invention, in which FIG. 1A is a front sectional view and FIG. 1B is a plan view.

2 shows a state in which the opening / closing lid of FIG. 1 is opened, (a) is a front sectional view, and (b) is a plan view.

FIG. 3 is a front cross-sectional view showing a second embodiment of the power distribution line detection device according to the present invention.

FIG. 4 is a front cross-sectional view of the state where the opening / closing lid of FIG. 3 is opened.

FIG. 5 is a front cross-sectional view showing an example of a connecting structure of an electric cable and a high-electric equipment by a detachable branch connector.

6 is a schematic diagram showing a potential difference generated in the detection electrode in FIG.

[Explanation of symbols]

 1 Detachable Branch Connection 2 Electric Cable 11 Electric Conductor 12 Insulation 13 Detection Electrode 15 Grounding Conductor 21 Insulation Projection 22 Shield 23 Opening / Covering 23a Knob 24 Detection Electrode 25 Connection Means 25A Coupling 25B Engagement 26 Unevenness Mating part D voltage detector

Claims (4)

[Claims] 1. A detection electrode (1) embedded in an insulating portion (12) of a distribution line and electrostatically coupled to an electric conductor (11).
3), an insulating protrusion part (21) disposed integrally with the insulating part in a protruding state, a shield part (22) disposed around the insulating protrusion part around the insulating protrusion part, and the shield part. An opening / closing lid (23) attached to the front surface of the insulating protrusion by the connecting means (25) to expose the outer surface of the insulating protrusion when exposed, and a detection electrode connected to the detection electrode exposed on the surface of the insulating protrusion. (24) A distribution line power detection device comprising: 2. A connecting means (25) is arranged at a joint between the shield part and the opening / closing lid and a rotary shaft (25a) for rotatably supporting the opening / closing lid (23) with respect to the shield part (22). The distribution line power detection device according to claim 1, further comprising a concave-convex fitting portion (26) that suppresses movement of the opening / closing lid when engaged. 3. The connecting means (25) comprises a shield part (2).
2) and the opening / closing lid (23) are movably connected to each other, and the flexible connecting body (25A) is arranged at the joint between the shield part and the opening / closing lid to restrain the movement of the opening / closing lid at the time of engagement. The engaging device (25B) which performs is provided, The electric power detection apparatus of the distribution line of Claim 1 characterized by the above-mentioned. 4. The open / close lid (23) includes an electrode (24) for voltage detection.
The power detection device for a power distribution line according to claim 1, 2 or 3, wherein the power detection electrode is grounded by contacting the power detection electrode when the power supply is closed.