JPH028441B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Purpose of the Invention [Field of Industrial Application] The present invention is a novel water resistor that is used for measuring and testing the output characteristics of power supplies including generators, inverters, etc. This invention relates to improvements in insulating sheaths.

[Prior Art] This new water resistor A, created by the present inventor and filed as Utility Model Application No. 177469/1983, has a water supply hole 1 in the middle part of the side wall and a drainage hole in the bottom, as shown in FIG. A bottomed cylindrical base electrode 3 is formed with a hole 2 to store a predetermined amount of water, and a support insulator 4, which is an insulator, is pierced through the center of the bottom of the base electrode 3. It consists of a cylindrical main electrode 5 to which a power cable (none of which is shown) is connected, and an insulating sheath cylinder 6 that covers the main electrode 5 and is suspended so as to be movable up and down to adjust the exposed length of the main electrode 5. Although there is only one water resistor A in FIG. 5, there are two or more water resistors in one set, and each main electrode 5 is connected to two or three phases of a power supply device (not shown).
Each pair of phases is connected while the base electrodes 3 are mutually and continuously grounded.

The water supply hole 1 and the drain hole 2 are connected to an electrode water treatment device (not shown) that circulates water to maintain a constant water temperature and remove impurities.

However, even if the electrode water treatment device is equipped, when the main electrode 5 is used at high pressure, the current density between the electrodes increases closer to the center and the amount of heat generated increases, so the surface temperature of the high voltage main electrode 5 rises rapidly and bubbles are generated. Then, there is a possibility that arc α discharge will occur between the high voltage main electrode 5 and the base electrode 3.

If this arc α discharge were to occur, the lower end of the insulating sheath cylinder 6 in the portion that touched this arc α would be burnt and the insulation effect would be reduced.

Therefore, if the insulating sheath tube 6 is to be replaced every time, and the use is continued, there is a risk of a serious accident, and safe protection measures must be taken.

[Problems to be Solved by the Invention] The present invention aims to provide an insulating sheath for a water resistor that has effective and appropriate arc protection means to eliminate the arc burnout accident of the insulating sheath in the water resistor. It is something to do.

(2) Structure of the Invention [Means for Solving the Problems] The insulating sheath tube in the water resistor of the present invention includes a bottomed cylindrical base electrode that stores therein a predetermined amount of circulatingly supplied water; A cylindrical high-voltage main electrode is erected through an insulating support stuck to the center of the bottom of the base electrode, and the power cable of the power supply device is connected to the lower end of the cylindrical high-voltage main electrode, and the exposed length of the high-voltage main electrode is adjusted. In a water resistor comprising an insulating sheath tube covering the high-voltage main electrode that is suspended so as to be movable up and down, a fine ceramic ring is wrapped around the entire lower end outer circumference of each of the insulating sheath tubes made of polypropylene or Teflon. Alternatively, a fine ceramic cylindrical ring is fitted inside the lower end, a sliding contact extending inward from a conductive arc ring fitted around the outer periphery of the lower end is brought into contact with the high voltage main electrode, Arc protection means is provided at the lower end of the insulating sheath by abutting the base electrode with a sliding contact extending outward from a conductive arc ring fitted inside.

[Example] A first example of the present invention will be described with reference to FIG.

In the insulating sheath tube B of the present invention, the insulating sheath tube 6 in the water resistor A shown in FIG. A fine ceramic ring 7 having arc heat resistance is wound around it.

A second embodiment of the invention will be described with reference to FIG.

In the insulating sheath cylinder C of the present invention, the insulating sheath cylinder 6 in the water resistor A shown in FIG. A fine ceramic cylinder ring 8 having arc heat resistance is fitted inside.

The fine ceramic cylindrical ring 8 has an outer diameter that matches the inner diameter of the insulating sheath cylinder C, and a stepped protrusion 8a that matches the thickness of the lower end of the insulating sheath cylinder C on the outer periphery of the lower end.

A third embodiment of the invention will be described with reference to FIG.

In the insulating sheath tube D of the present invention, the insulating sheath tube 6 in the water resistor A shown in FIG. At the same time, the bent portions of the sliding contacts 11 extending obliquely upward and inward toward the center are inserted into the high-voltage main electrode 5 through 10 groups of through holes equally spaced on the inner circumference of the arc ring 9. It comes into contact with the outer periphery.

A fourth embodiment of the present invention will be described with reference to FIG.

In the insulating sheath tube E of the present invention, the insulating sheath tube 6 in the water resistor A shown in FIG. A metal arc ring 12 is fitted inside the metal arc ring 12, and sliding contacts 14 extend diagonally upward and outward radially through a group of 13 through holes equidistantly spaced around the outer circumference of the arc ring 12.
The bent portion of the group is brought into contact with the inner periphery of the base electrode 3.

[Function] Since the present invention is constructed as described above, even if an arc α discharge as shown in FIG. Since it is protected by the ceramic ring 7 and the fine ceramic cylindrical ring 8, deterioration of the insulation effect due to burnout can be avoided. Further, in the case of the third embodiment, an arc ring 9 is attached to the outside of the lower end of the insulating sheath cylinder D, and the arc ring 9 and the high voltage main electrode 5 are connected to each other.
and are at the same potential through the group of sliding contacts 11, an arc α discharge is generated between the arc ring 9 and the base electrode 3, and the arc α is prevented from passing through and coming into contact with the lower end of the insulating sheath D.

Furthermore, in the case of the fourth embodiment, an arc ring 12 is attached to the inside of the lower end of the insulating sheath tube E, and the arc ring 12 and the base electrode 3 are made to have the same potential through a group of sliding contacts 14. The arc α discharge is generated between the arc ring 12 and the high voltage main electrode 5 to prevent the arc α from passing through and coming into contact with the lower end of the insulating sheath tube E.

(3) Effects of the Invention In this way, since the lower ends of the insulating sheath tubes B, C, D, and E of the present invention are provided with arc protection means, even if an arc α discharge occurs, the insulating sheath tubes B, C,
Since the lower ends of D and E will not be burnt out, there will be no deterioration in insulation even after subsequent use, making them highly durable.The troublesome replacement work of insulating sheath tubes B, C, D, and E will be drastically reduced, making maintenance inspections easier. Maintenance work becomes easier,
Moreover, it has excellent effects such as being able to eliminate major accidents caused by dielectric breakdown of water resistors.

[Brief explanation of drawings]

FIG. 1 is a partially omitted central longitudinal cross-sectional view showing a first embodiment of the present invention, FIG. 2 is a partially omitted central longitudinal cross-sectional view showing a second embodiment of the invention, and FIG. FIG. 4 is a partially omitted central vertical cross-sectional view showing the third embodiment, FIG. 4 is a partially omitted central longitudinal cross-sectional view of the fourth embodiment, and FIG. FIG. A... Water resistor, B, C, D, E... Insulating sheath tube, α... Arc, 3... Base electrode, 4... Support insulator, 5... Main electrode, 6... Insulating sheath tube, 7...
Fine ceramic ring, 8... Fine ceramic cylinder ring, 9, 12... Arc ring, 1
0, 13...Through hole, 11, 14...Sliding contact.

Claims (1)

[Scope of Claims] 1. A cylindrical base electrode with a bottom that stores a predetermined amount of water that is circulated therein, and an insulating support that is erected through an insulating support that penetrates through the center of the bottom of the base electrode. It consists of a cylindrical high-voltage main electrode to which the power cable of the power supply device is connected at the lower end of the extension, and an insulating sheath tube that covers the high-voltage main electrode and is suspended so as to be movable up and down in order to adjust the exposed length of the high-voltage main electrode. An insulating sheath tube for a water resistor, the insulating sheath tube being provided with arc protection means at the lower end of said insulating sheath tube. 2. The insulating sheath cylinder in the water resistor according to claim 1, wherein the arc protection means is formed by winding a fine ceramic ring around the entire lower end outer circumference of the insulating sheath cylinder. 3. The insulating sheath cylinder in the water resistor according to claim 1, wherein the arc protection means is formed by fitting a fine ceramic cylinder ring into the lower end of the insulating sheath cylinder. 4. The arc protection means is formed by contacting the high-voltage main electrode with a sliding contact extending inward from a conductive arc ring fitted around the outer periphery of the lower end of the insulating sheath cylinder. Insulating sheath tube in resistor. 5. The arc protection means is formed by contacting the base electrode with a sliding contact extending outward from a conductive arc ring fitted into the inner periphery of the lower end of the insulating sheath cylinder. Insulating sheath tube in resistor. 6 The insulating sheath tube is made of heat-resistant plastic such as polypropylene or Teflon.
An insulating sheath tube in a water resistor according to item 1, 2, 3, 4 or 5.