JPH0526896Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an improvement of an insulation reinforcing cap with a voltage detection function.

[Prior Art] A conventional example of an insulation reinforcing cap with a voltage detection function will be described with reference to the drawings. At the cable connection point of a high-voltage device, a connection portion is provided to connect the device-side bushing and the cable end, and the connection is performed after being electrically insulated. For safety, the bushing on the device side to which the cable is not connected is covered with an insulation reinforcing cap that has substantially the same structure as the cable connection part and has both moisture-proofing and electrical insulation. In this case, it is generally common practice to provide the cap with a power detection function so that the presence or absence of power being charged in the power transmission and distribution system can be detected from the outside.

An example of the structure of this insulation reinforcing cap is shown in the sectional view of FIG. That is, in order to fit the insulation reinforcing cap into the conical device-side bushing on the left side (not shown), it is inserted into the deep part of the insertion opening 1 having a similar shape.
An internal high-voltage electrode 2 having a connecting portion for connecting the left side to the tip of the bushing is provided, and the outer circumference of the internal high-voltage electrode 2 is covered with an insulating member 5 to form a cap body. A shielding portion 3 is formed on the outer periphery of the insulating member 5 to be connected to an external shielding layer of the device-side bushing.

At this time, so that a voltage is induced by capacitive coupling via the internal high voltage electrode 2 and the insulating member 5,
The shielding part 3 is separated from the shielding part 6 at the tip into a band shape to form a voltage detecting part (striped electrode) 4.

In an insulation reinforcing cap with such a structure, when voltage detection is not performed, the periphery of the voltage detection part 4 is usually covered with a cylindrical conductive cover 7 as shown in FIG. The shielding layer, the shielding part 3, the conductive voltage detection cover 7, and the end shielding layer 6 form a continuous shielding layer and are sealed to ensure safety. This conductive cover 7 is tightly attached to the voltage detecting section 4 using a mounting screw of a band-shaped tightening member, so when performing voltage detection work (referred to as edge cutting), loosen this screw and tighten the voltage detecting section 4. 4 to shift the conductive cover 7 toward the end,
As shown in FIG. 6, the voltage detection section 4 was exposed and brought into contact with a voltage detection probe (not shown) to perform voltage detection.

[Problems to be solved by the invention] By the way, the shielding layers 3 and 6 on both sides of the voltage detection section 4 need to be grounded for safety reasons, and the voltage induced in the voltage detection section 4 is connected to the band-shaped voltage detection section 4. Since the voltage is determined by the capacitance coupling between the internal high voltage electrode 2 and the shielding layers 3 and 6 on both sides, it has been difficult to reduce the shape of the voltage detecting section 4 in order to induce a predetermined voltage.

In addition, when voltage detection is not performed (normal state), it is necessary to cover the voltage detection unit 4 with the conductive cover 7, which makes the fixing work complicated, which reduces the efficiency of voltage detection work. be.

Therefore, the purpose of this invention was to solve the above-mentioned problems, significantly reduce the size of the voltage detection part, and create an insulation reinforcing cap with a simple structure and inexpensive voltage detection function that allows for easy voltage detection work. Our goal is to provide the following.

[Means for Solving the Problems] In the insulation reinforcing cap with a voltage detection function according to this invention, the cap body has a cable connection insertion hole formed at one end, and an internal high voltage electrode is provided at the tip of the cap body. An insulating material and an external shielding layer are provided in a cylindrical shape around the outer periphery of the internal high voltage electrode, and an end shielding layer is formed at the other end of the cap body as a voltage detecting section separated from the external shielding layer. The insulation reinforcing cap with a voltage detection function is characterized in that a conductive lid is provided on the layer so as to cover the external shielding layer.

[Function] Therefore, by providing a separate and independent voltage detection section at the end of the external shielding layer of the cable, the cap body of the connection part can be made smaller, and it is possible to reduce the size of the cap body by simply removing the conductive cover body. The end shielding layer is exposed to enable efficient voltage detection.

[Example] Hereinafter, an example of this invention will be described using FIGS. 1 to 4.

1 and 2 showing the first embodiment of this invention, an unused part of the cable connection part of the cable connection part is inserted into the inner part of the cable connection part insertion opening 11 of the cap body 10. A high voltage electrode 12 is provided. A cylindrical shielding portion 13 is formed on the outer periphery of the internal high-voltage electrode 12 and is connected to an external shielding layer of the cable connection portion via an insulating member 15.

Furthermore, when an unused cable connection point is inserted into the cable connection point insertion opening 11, the internal high voltage electrode 12 is electrically connected to the tip of a connection cable conductor (not shown). It's becoming like that.

An end shielding layer 14 is integrally provided at the tip of the insulating member 15, which is a voltage detecting section that is cut at a predetermined distance from the internal high voltage electrode 12 and the shielding section 13. A conductive lid 17 made of a conductive material and having a flange portion that covers the entire end shielding layer 14 and connects to the shielding portion 13 is removably placed on the end shielding layer 14 . Therefore, by removing the conductive lid 17, the end shielding layer 14, which is separated and independent from the internal high voltage electrode 12, acts as a voltage inducing section.

Therefore, in a normal state where no voltage detection work is performed, the shielding part 13 and the end shielding layer 14 are electrically connected with the conductive lid 17 covered as shown in FIG. The end of the outer shielding layer of the cable will be completely covered and reinforced with insulation.

On the other hand, when detecting the presence or absence of electricity in the power transmission and distribution system, the above-mentioned conductive lid 17 covering the end shielding layer 14 is removed and the end shielding layer 14 is exposed as shown in FIG. let Thereafter, by bringing the voltage detection probe 16 into contact with the end shielding layer 14, the voltage detection operation can be easily performed.

In addition, if the entire cap is configured in an L-shape for reasons such as facilitating the voltage detection work, as shown in FIG. 4, a cap body 10' similar to that shown in FIGS. Cable connection insertion port 11', internal high voltage electrode 12', shielding part 13', end shielding layer 14', insulating member 15', conductive lid 1
7'.

In addition, when attaching the removable conductive lid 17' as described above, an O-ring-shaped protrusion is provided on the outer peripheral surface of the tip of the shielding part 13' as shown in FIG. By forming a fixing means consisting of a groove for fitting and holding the conductive lid 17' on the inner circumferential surface of the conductive lid 17', it is possible to prevent the lid from falling off, and the attachment is reliably locked.
Also, in the case of the conductive lid 17 shown in FIG.
By providing a fixing means consisting of a protrusion and a groove similar to those described above, the conductive lid 17 can be prevented from falling off and its attachment can be reliably locked.

The insulating reinforcing cap with voltage detection function according to the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the gist thereof.

For example, the end shielding layer may be made of metal, and the insulation reinforcing cover can be used not only for cable connections as described above, but also for all types of insulation reinforcement such as direct connection to equipment. Of course, it can be applied.

[Effects of the invention] As described above, according to this invention, it is possible to significantly reduce the size of the voltage detection part and provide an insulation reinforcing cap with a voltage detection function that is simple in structure and inexpensive.

In other words, since the voltage detection part is located at the end of the cap, the safety grounding of the shielding layer is at the terminal on the equipment side shielding layer side.
In addition, the size required to form the voltage detecting section can be significantly smaller than that of the conventional type.

In addition, when performing voltage detection work, all you have to do is remove the conductive cap, which eliminates the need for the conventional troublesome work of loosening the fixing screws on the conductive cover and then moving the cover. Electricity detection work can be performed extremely easily and efficiently.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of an insulation reinforcing cap with voltage detection function showing an embodiment of this invention, Fig. 2 is a cross-sectional view showing the state during voltage detection work, and Fig. 3
The figure is a sectional view showing the normal state, FIG. 4 is a sectional view of the main part showing another embodiment of this invention, and FIG. 5 is the main part of a conventional insulation reinforcing cap with voltage detection function. The cross-sectional view, FIG. 6, is a partially enlarged cross-sectional view showing the state during voltage detection work, and FIG. 7 is a cross-sectional view, similarly showing the normal state. 10, 10'... Cap body, 11, 11'...
Cable connection point insertion port, 12, 12'... Internal high voltage electrode, 13, 13'... Shielding part, 14, 1
4'... End shielding layer (voltage detection section), 15, 15'...
Insulating member, 17, 17'... conductive lid.

Claims (1)

[Scope of Claim for Utility Model Registration] In a cap with a voltage detection function for reinforcing the insulation of a cable connection part, the cap body has a cable connection part insertion hole formed at one end, and an internal high voltage electrode is provided at the tip of the cap body. An insulating material and an external shielding layer are provided around the outer periphery of the electrode in a cylindrical shape, and an end shielding layer is formed at the other end of the cap as a voltage detecting section separated from the external shielding layer. An insulation reinforcing cap with a voltage detection function, characterized in that a conductive lid is provided to cover the external shielding layer.