JPH03215113A - High voltage machinery and apparatus with voltage detection display - Google Patents

Abstract

PURPOSE:To safely perform a confirming work whether a high voltage is applied or not by burying a voltage detection electrode in an insulator, mounting a voltage display unit, protecting it with a protective cover, and visually recognizing it externally. CONSTITUTION:A conductor 21 in which a high voltage is applied is buried in an insulating molded form such as epoxy resin, etc. When a blind plug insulator 31 buried with a voltage detection electrode 32 is engaged with the form 22, metal 35 is pressed to the conductor 21 by a spring 36 under predetermined pressure. When a high voltage is applied to the conductor 21, a predetermined voltage is induced at the electrode 32 due to a capacitance C formed between stopper fittings 33 and the electrode 32, and displayed on a voltage display unit 50. Since the unit 50 is externally exposed from a grounded protective cover 44, a worker can visually confirm the presence or absence of the voltage safely from the exterior.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to high voltage equipment with a voltage detection display that has the function of displaying whether or not high voltage is actually applied to a high voltage charging section. .

(Prior art) When performing maintenance and inspection work on power cable connections and attached equipment, it is determined whether or not high voltage is actually being applied to the high voltage charging section, and if necessary, , take measures such as shutting off the power supply for safety. Inspecting high-voltage equipment with exposed conductors is relatively easy. However, like power cable connections and terminations,
In high-voltage equipment whose high-voltage charging parts are hermetically protected, a voltage detector cannot be brought into direct contact with the high-voltage charging parts, such as the center conductor.

Therefore, the following configuration has been conventionally adopted.

FIG. 4 shows a longitudinal cross-sectional view of a main part of a conventional cable connection section.

In the figure, a conductor 1 is insulated and protected by an insulator 2 such as polyethylene or epoxy resin, and an external shielding layer 3 is provided on the outermost periphery.
is formed. This external shielding layer 3 is grounded by a lead wire 4.

Here, a large diameter portion is formed in a part of the insulator 2 and the external shielding layer 3, and a voltage detecting ring 5 made of an annular conductor is embedded therein. A voltage detection rod 6 is implanted in the voltage detection ring 5 and is configured to be exposed to the outside through an edge cutout 3a formed in a part of the external shielding layer 3.

In this configuration, when the voltage detection rod 6 is grounded via a resistor (not shown), a predetermined voltage is applied to the voltage detection ring 5 due to the capacitance C formed between the voltage detection ring 5 and the conductor 1. is induced. Therefore, with respect to the voltage detector 6, the voltage detector 8
By applying force to the conductor 1 through the lead wire 9, it is possible to determine whether or not a predetermined voltage is being applied to the conductor 1.

Note that since it is normally dangerous to come into contact with the exposed voltage detection rod 6, the voltage detection rod 6 is covered with a conductive cap 7, and the voltage detection rod 6 is electrically connected to the external shielding layer 3 and grounded. That's what I do. For this purpose, the inner surface of the conductive cap 7 is provided with a protrusion 7a that comes into contact with the voltage detection rod 6.

FIG. 5(a) shows a vertical sectional view of the main part of a branch part of a conventional cable.

The figure shows a blind structure in which one unused branch of the T-branch or Y-branch is provided with a voltage detecting electrode as described above.

That is, the conductor 11 in the figure is housed in the second part of the shield case l2, and the conductor 11 is housed in the insulating molded part 1 made of rubber or the like.
3 insulatively supported within the shield case 12. The conductor 11 and the other conductor l4 are connected to a connecting fitting 15.
are connected at right angles to each other.

As shown in FIG. 5(b), the connecting fitting 15 has a screw hole 15a at one end into which the screw portion 11a of the conductor 11 is screwed. The conductor 14 shown in FIG. 5(a) is inserted into the large diameter portion of this connecting fitting 15 and is compressed and fixed. Note that a semiconductive rubber layer 15a is formed around the edge of the connection fitting l5 in order to reduce concentration of electric field on the edge of the connection fitting l5.

When actually connecting the cable end to this branch, conductor 1
A connection connector or the like is attached to the threaded portion 11a side of 1.

However, here, in order to make this part blind, a blind plug insulator 17 formed by molding epoxy resin or the like is fitted. A high voltage electrode 16 is embedded in the tip of this blind plug insulator 17, and this high voltage electrode 16 is configured to be screwed into the threaded portion 11a of the conductor 11. Furthermore, a voltage detection electrode 18 is embedded in the upper part of the blind plug insulator 17.

Even in the case of such a configuration, a predetermined voltage is induced in the voltage detection electrode 18 due to the capacitance C formed between the high voltage electrode 16 and the voltage detection electrode 18. This is measured in the manner described in FIG. 4 to detect whether or not a high voltage is being applied to the conductor 11.

Also in this example, a conductive cap 19 is usually used to
The protrusion 19a is brought into contact with the voltage detection electrode 18, and the voltage detection electrode 18 is grounded.

(Problem to be Solved by the Invention) By the way, in the case of the conventional high voltage equipment as described above, when an operator actually performs voltage detection work, the conductive cap 7
and 19 are removed. At this time, the voltage detection rod 6 and the voltage detection electrode 18 are exposed to the outside, which is dangerous as there is a risk of electric shock if the work is not done carefully. Further, in the case of voltage detection work, it is necessary to prepare a specified voltage detector, and there is a problem in that the handling thereof is also complicated.

The present invention has been made with attention to the above points, and provides a high voltage device with a voltage detection display that provides a voltage detection display function to the high voltage device itself, ensuring safety and simplifying work. The purpose is to

(Means for Solving the Problems) The high-voltage device with voltage detection display of the present invention includes a voltage detection electrode embedded in an insulator of a high voltage charging section, and a voltage detection electrode that detects the presence or absence of voltage applied to the voltage detection electrode. The present invention is characterized by comprising a voltage indicator that detects and displays the voltage, and a protective cover that protects the voltage detection electrode and the vicinity of the voltage indicator.

(Function) The high voltage device of the present invention has a voltage indicator integrated with the electrode for voltage detection in advance. And to prevent danger,
These are protected by a protective cover. The protective cover protects the voltage display so that the display is visible.

Therefore, the operator can judge whether or not a voltage is actually being applied without touching the voltage detecting electrode or the like.

(Example) Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a high-voltage device with a voltage detection display according to the present invention. The figure shows an electric power detection display function related to the present invention added to the portion where branches such as the Y branch and T branch explained using FIG. 5 are blinded.

In the figure, a conductor 21 to which a high voltage is applied is embedded in an insulating mold part 22 made of epoxy resin or the like. This insulating molded portion 22 has embedded nuts 23 and 25 embedded in the left and right upper end surfaces in the figure, into which ports 24 and 26 are screwed.

On the other hand, the blind plug insulator 3l has a shape that fits into the tapered hole of the insulating mold part 22, and a stopper fitting 33 is fixed to the lower end thereof. A metal cap 35 is placed over the stopper fitting 33, and a bolt 34 is screwed into the shaft portions of both. The spring 36 fitted around the outer periphery of the bolt 34 exerts a force to spread the gap between the stopper fitting 33 and the metal cap 35. That is, when the blind plug insulator 31 is fitted into the insulating mold part 22, the metal cap 35 comes into contact with the conductor 21 and is prevented from moving downward. Accordingly, the spring 36 is compressed, and the metal cap 35 and the conductor 21 are pressed together with a constant pressure and electrically connected.

Furthermore, a voltage detection electrode 32 is embedded in the upper part of the blind plug insulator 31. Two to four bolts 40 are implanted in this voltage detecting electrode 32, and an annular washer 43 is inserted so as to sandwich a spring 41 fitted into the outer periphery of the bolt 40.
is inserted. Further, a nut 42 is screwed into the other end of the bolt 40 to prevent the washer 43 from coming off.

This washer 43 comes into contact with a step provided on the inner peripheral surface of the protective cover 44, and the spring 41 is in a compressed state. As a result, the blind plug insulator 31 is pressed against the insulating mold part 22 via the voltage detecting electrode 32 by the pressing force of the spring 41.

The protective cover 44 is made of a conductive metal or the like, and is fixed to the upper end surface of the insulating mold part 22 by the bolts 24 described above. Furthermore, a lug plate 29 is sandwiched between two nuts 27 and 28 screwed into the bolt 26, and this lug plate is grounded via a lead wire 30. As a result, the protective cover 44 is grounded.

Further, a voltage indicator 50 made of a neon tube or the like is fixed to the upper center of the protective cover 44, and an arrester 53 is connected in parallel to its two lead plugs 51 and 52. Further, one lead wire 51 is electrically connected to the inner surface of the protective cover 44 with a screw 54 . The other lead wire 52 is electrically connected to the upper surface of the voltage detecting electrode 32 by a screw 55.

The arrester 53 is provided for protection when an abnormal voltage is applied to both ends of the voltage indicator 50.

In the high voltage device of the present invention having the above configuration, when a high voltage is applied to the conductor 21, the capacitance C formed between the stopper fitting 33 and the voltage detection electrode 32 allows the voltage detection to be performed. A predetermined voltage is induced in the electrode 32. The voltage indicator 50 is
The presence or absence of that voltage is detected and displayed. The display surface of the voltage indicator 50 is exposed to the outside, and the operator can recognize the presence or absence of voltage applied to the conductor 21 without touching the voltage detection electrode 32. Note that if part or all of the protective cover 44 is transparent, the voltage indicator 50 may be fixed to the voltage detecting electrode 32 side.

For high voltage equipment with operating voltages from 6KV to 33KV,
Conventionally, many devices have a voltage detecting electrode as shown in FIG. 4 or FIG. 5. Therefore, by adding a voltage indicator and a protective cover as shown in Figure 1,
A safe voltage detection display function can be provided.

FIG. 2 shows a longitudinal sectional view of the conventional cable connection section shown in FIG. 4 in which the present invention is applied. The same parts as in FIG. 4 are given the same reference numerals.

The voltage detection rod 6 is attached with an arrester 53 and a voltage indicator 50 made of a neon tube or the like as previously explained in FIG. A protective cover 44 is provided so that the display on the voltage indicator 50 can be confirmed from the outside. The protective cover 44 is made of a conductive or semiconductive material.

Further, FIG. 3 shows an example in which the present invention is applied to the conventional cable branch section shown in FIG. 5.

In this case as well, the arrester 53 and voltage indicator 50 described in FIG. 1 are attached to the voltage detecting electrode 18. and,
The voltage indicator 50 is fixed to the protective cover 44, and the display is configured to be visible from the outside.

The present invention is not limited to the above embodiments.

The present invention can be applied to various parts of various high-voltage devices, and the configuration of the voltage indicator, protective cover, etc. can be freely selected depending on the location where the device is used.

In the above embodiment, a neon tube is used as the voltage indicator, but if it is left on all the time, there is a risk that its lifespan will be shortened. Therefore, if necessary, an on/off switch for display may be installed and the light may be turned on only during voltage detection work.

(Effects of the Invention) The high voltage equipment of the present invention described above has a voltage detection electrode embedded in an insulator, a voltage indicator attached thereto, and protected by a protective cover, so that the display can be viewed from the outside. Since it is made visible, the operator can safely judge whether or not high voltage is being applied. Further, when carrying out voltage detection work, there is no need to prepare a special voltage detector or the like, and the work can be simplified.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the main part showing an embodiment of the high voltage equipment of the present invention, FIG. 2 is a longitudinal sectional view of the main part of the cable connection part showing another embodiment of the invention, and FIG. FIG. 4 is a longitudinal sectional view of the main part of a cable branch part showing another embodiment, FIG. 4 is a longitudinal sectional view of the main part of a conventional cable connection part, and FIG. 5(a) is a longitudinal sectional view of the main part of a conventional cable branch part. FIG. 6(b) is an exploded view of the vicinity of the connecting fitting. 2 1--1--1 conductor (high voltage charging section) 22--1--1 insulation mold section, 30--11--1 grounding wire, 3 1--1- --1 blind plug insulator, 32---1---1 voltage detection electrode, 44---1---1 protective cover 50---1 voltage indicator, 51.52- -----Lead wire, 53------Arrester. (It!!!!l Rufu No. C Figure 2 IP!! Figure 3 Figure 4 Figure 5 Figure 4

Claims (1)

[Claims] A voltage detection electrode buried in the insulator of the high voltage charging section, a voltage indicator that detects and displays the presence or absence of voltage applied to the voltage detection electrode, and protection of the voltage detection electrode and the vicinity of the voltage display. A high-voltage device with a voltage detection display, characterized in that it is equipped with a protective cover that protects the device.