CN104133161A - electrical test fixture for lightning arrester - Google Patents

Abstract

The invention relates to the technical field of an electrical test of a lightning arrester and particularly relates to an electrical test fixture for a lightning arrester. The electrical test fixture comprises an outer cylinder extending along the vertical direction; the outer cylinder is internally provided with a conductive bar; the periphery of the conductive bar is sleeved with a cylindrical shielding cover; and the shielding cover is arranged inside the outer cylinder and supported and fixed by the outer cylinder. The distribution of the electric field inside the electrical test fixture for the lightning arrester can be greatly improved, inner discharge can be effectively avoided, the inner electric field is uniformly distributed, partial discharge interference in the electrical test of the tested lightning arrester can be reduced to the minimum, the partial discharge index can be controlled within the specified range, and the test efficiency is improved.

Description

Lightning arrester electrical test tooling

technical field

The invention relates to the technical field of electrical testing of lightning arresters, in particular to a tool for electrical testing of lightning arresters.

Background technique

In the electrical test process of the tank arrester in the fully enclosed combined electrical appliance, the AC and DC high voltage generated by the AC and DC equipment must be connected to the high voltage end of the arrester through the arrester electrical test tooling. The function of the arrester electrical test tool is internal conduction and external insulation. As shown in Figure 1, the existing lightning arrester electrical test equipment includes an outer cylinder body composed of an insulating sleeve 11 and a transition cylinder body 12. The transition cylinder body 12 is fixed at the lower end of the insulation sleeve 11, and a conductive The rod 13, the upper end of the insulating sleeve 11 is provided with an upper cover plate 15, and the upper side of the upper cover plate 15 is fixed with a wiring ring 14; Loose high-voltage wires, poor contact, slipping and other problems; in addition, during use, discharges are prone to occur inside the electrical test tooling of the arrester and at the upper end cover of the insulating sleeve, and the distribution of the internal and external electric fields is uneven, which will affect the local area of the arrester. In the discharge test, the quality of the arrester under test cannot be well controlled, resulting in a waste of cost and low test efficiency.

Contents of the invention

The object of the present invention is to provide a lightning arrester electrical test tool with uniform internal electric field distribution.

In order to achieve the above object, the present invention adopts the following technical scheme: lightning arrester electrical test tooling, including an outer cylinder body extending in the up and down direction, a conductive rod is arranged in the outer cylinder body, and a cylindrical shielding cover is set on the periphery of the conductive rod, and the shielding cover It is arranged inside the outer cylinder and supported and fixed by the outer cylinder.

The outer cylinder includes an insulating sleeve and a transition cylinder distributed along the up and down direction, and the shielding cover includes an inner shielding cover and an outer shielding cover arranged coaxially, the outer shielding cover is arranged in the insulating sleeve, and the upper end of the inner insulating cover It is located in the insulating sleeve and extends downward into the transition cylinder through the outer shield.

A flange is fixedly installed between the lower end surface of the insulating sleeve and the upper end surface of the transition cylinder, the lower end support of the outer shield is fixedly installed on the upper end surface of the flange, and the lower end surface of the flange is fixed with an orientation A sleeve-shaped insulating seat for inserting the inner shielding cover extending downward into the transition cylinder, the lower opening of the insulating seat is smaller than the upper end, and the lower end of the inner shielding cover is fixedly mounted on the lower opening of the insulating seat.

The lightning arrester electrical test tooling includes an upper cover plate arranged on the upper end of the insulating sleeve, and a pressure equalizing ring is fixedly mounted on the upper end surface of the upper end cover.

The lightning arrester electrical test tooling includes a wiring device fixed on the upper side of the upper cover. The wiring device includes a wiring board. The wiring board is provided with wiring holes for inserting high-voltage lines and fixing bolts for fixing high-voltage lines.

The lower end of the outer shield is fixed with a ring-shaped first base, and the outer edge of the first base has protrusions evenly distributed along the circumferential direction, and the first mounting holes are opened on the upper end of the flange corresponding to the protrusions. The upper end surface of the blue plate and the first base are fixedly connected by bolts inserted in the first installation hole, and the upper end surface of the insulating base and the flange plate are correspondingly provided with a second installation hole, and the second installation hole is correspondingly arranged in the corresponding In the gap between the adjacent protrusions, the lower end surface of the flange and the lower end surface of the insulating seat are fixedly connected by bolts inserted in the second mounting hole, and the lower end of the inner shield is fixed with a ring-shaped second In the base, the lower end surface of the insulating base is fixedly connected with the upper end surface of the second base by bolts.

The pressure equalizing ring is an annular cylindrical structure. The pressure equalizing ring includes an upper pressure equalizing ring and a lower pressure equalizing ring. The upper and lower pressure equalizing rings are distributed along the up and down direction. The upper cover is fixed with upper and lower brackets by bolts. The lower pressure equalizing ring is welded to the upper bracket and the lower bracket respectively, and the upper and lower pressure equalizing rings are respectively fixed and assembled on the upper cover plate through the upper and lower brackets.

Beneficial effects of the present invention: Since the interior of the lightning arrester electrical test tooling of the present invention is provided with a cylindrical shielding cover that is set on the periphery of the conductive rod, the potential distribution inside the outer cylinder can be gradually and uniformly decreased from the center to the outside. Therefore, the present invention The invention can greatly improve the electric field distribution inside the lightning arrester electrical test tool, thereby effectively avoiding internal discharge, making the internal electric field distribution uniform, and minimizing the partial discharge interference in the electrical test of the lightning arrester under test; at the same time, it can make the regulation of partial discharge index control Within the range, the test efficiency is improved.

Further, the insulating cover includes an inner insulating cover and an outer insulating cover, which can make the distribution of the electric field inside the insulating sleeve more uniform, and the inner insulating cover extends downward into the transition cylinder to effectively ensure For the uneven surface caused by the transition, the inner insulating cover can improve the electric field distribution inside the transition cylinder; through the inner shielding cover, a large part of the electric field intensity can be effectively shielded, and in order to ensure this smooth transition, the auxiliary outer shielding cover can avoid The probability of discharge in the upper and lower space transition connection parts changes from point-to-point electric field to face-to-face electric field; the inner shield is longer than the shield to ensure that the outer shield is at a potential height, which is conducive to the stability of the electric field.

Further, the lower end of the outer shield is fixedly mounted on the upper surface of the flange, the inner shield is fixedly mounted on the flange through the insulating seat, and the inner and outer shields are isolated by the insulating seat, effectively ensuring The insulation between the inner and outer shields is good; in the assembly process, the flange is first assembled on the lower end of the insulating sleeve, and then the insulating seat is assembled on the lower end of the flange, and then the outer shield is fixed and assembled. On the upper end face of the flange, the inner shield is fixedly fitted to the opening of the lower end of the insulating seat, and then the transition cylinder is placed on the periphery of the lower end of the inner shield and the transition cylinder is fixedly connected to the flange. The assembly process is simple and convenient.

Furthermore, the voltage equalizing ring can avoid problems such as surface flashover and discharge at the upper end cover of the insulating sleeve, improve the distribution of the external electric field, make the distribution of the external electric field uniform, and control the partial discharge index within the specified range, improving the test efficiency.

Furthermore, the fixing bolts on the wiring board can firmly fix the high-voltage wires, and there will be no problems of looseness and poor contact.

Further, the pressure equalizing ring includes an upper and a lower pressure equalizing ring, and the upper and lower pressure equalizing rings are detachable structures, which are convenient for transportation.

Description of drawings

Fig. 1 is the structural representation of existing lightning arrester electrical test tooling;

Fig. 2 is a structural schematic diagram of an embodiment of the lightning arrester electrical test tooling of the present invention.

Detailed ways

An embodiment of the lightning arrester electrical test tooling of the present invention is shown in Figure 2: the lightning arrester electrical test tooling includes an outer cylinder extending in the up and down direction, and the outer cylinder includes an insulating sleeve 1 and a transition cylinder 2 distributed in the up and down direction , the lower end of the insulating sleeve 1 is sealed and fixedly connected with the upper end of the transition cylinder 2, the upper end of the insulating sleeve 1 is fixed with an upper cover plate 3, and the upper and lower sides of the upper end cover 3 are respectively fixed with a wiring device 4 and a conductive The rod 5 and the conductive rod 5 are arranged in the outer cylinder, and the outer periphery of the conductive rod 5 is covered with a cylindrical shielding cover, and the shielding cover is arranged inside the outer cylinder and is supported and fixed by the outer cylinder. In this embodiment, the shielding case includes an inner shielding case 6 and an outer shielding case 7 arranged coaxially, the outer shielding case 7 is arranged in the insulating sleeve 1, and the upper end of the inner insulating case 6 is arranged in the insulating sleeve 1 and passes through The outer shield 7 extends downwards into the transition cylinder 2 . A flange 8 is fixed between the upper end surface of the transition cylinder 2 and the lower end surface of the insulating sleeve 1. The lower end of the outer shield 7 is supported and fixed on the upper end surface of the flange 8. The flange The lower end surface of 8 is fixed with a sleeve-shaped insulating seat 9 that extends downward into the transition cylinder 2 and is used for inserting the inner shield 6. The opening of the lower end of the insulating seat 9 is smaller than the upper end, and the inner shield 6 The lower end support is fixedly assembled at the lower end opening of the insulating seat 9 . The insulating seat 9 is formed by pouring epoxy resin. The lower end of the outer shield 7 is fixed with an annular first base 71, the outer edge of the first base 71 has protrusions uniformly distributed along the circumferential direction, and the protrusions and the upper end surface of the flange are correspondingly provided with first mounting holes. The upper end surface of the flange plate 8 and the first base 71 are fixedly connected by bolts inserted in the first mounting hole, and the upper end surface of the insulating seat 9 and the flange plate 8 are correspondingly provided with a second mounting hole. The holes are correspondingly arranged in the gaps between adjacent protrusions, the lower end surface of the flange 8 and the lower end surface of the insulating seat 9 are fixedly connected by bolts inserted in the second mounting holes, and the lower end of the inner shield 6 is fixed. An annular second base 61 is provided, and the lower end surface of the insulating base 9 is fixedly connected to the upper end surface of the second base 61 by bolts. A pressure equalizing ring is fixedly mounted on the upper end surface of the upper cover plate 3 . The pressure equalizing ring is an annular cylindrical structure. The pressure equalizing ring includes an upper pressure equalizing ring 101 and a lower pressure equalizing ring 102. The upper and lower pressure equalizing rings are distributed along the up and down direction. The upper cover plate 3 is fixed with an upper bracket 103 and The lower bracket 104, the upper equalizing ring 101 is welded to the upper bracket 103, the lower equalizing ring 102 is welded to the lower bracket 104, and the upper and lower equalizing rings are respectively fixed and assembled on the upper cover plate 3 through the upper and lower brackets. The wiring device 4 includes a wiring board. The wiring board is provided with wiring holes for inserting high-voltage wires and fixing bolts for fixing the high-voltage wires. The wiring board and the upper end cover are connected by bolts. An air valve 21 is fixed on the outer peripheral surface of the transition cylinder body 2, and the air valve 21 is fixedly assembled on the outer peripheral surface of the transition cylinder body 2 through four double-ended studs.

The lower end of the inner shield 6 is in the transition barrel and the upper end is in the insulating sleeve to effectively ensure the uneven surface produced by the transition between the transition barrel 2 and the insulating sleeve 1; the suspended inner shield 6 can effectively shield a Most of the electric field strength, at the same time, in order to ensure this smooth transition, an auxiliary outer shield 7 and insulating seat 9 are equipped to avoid the probability of discharge in the upper and lower space transition connection parts, and the face-to-face electric field becomes a face-to-face electric field. The reason why the inner shield 6 is longer than the shield 7 is to ensure that the outer shield 7 is at a potential height, which is beneficial to the stability of the electric field.

The use process of the above-mentioned lightning arrester electrical test tooling embodiment: one end of the high-voltage line is electrically connected to the terminal board, the other end is connected to the lightning arrester pot insulator through the lower end of the transition cylinder 2, and the inside is electrically connected to the pot insulator through the conductive rod 5 electrical connections. The arrester can avoid air flashover and other phenomena during the high-voltage test.

In other embodiments of the lightning arrester electrical test tool of the present invention, it may also include only the upper or lower pressure equalizing ring.

In other embodiments of the lightning arrester electrical test fixture of the present invention, the pressure equalizing ring can also be omitted.

In other embodiments of the lightning arrester electrical test fixture of the present invention, the wiring device can also be a wiring ring.

In other embodiments of the lightning arrester electrical test fixture of the present invention, there may be one or more than two insulating covers.

Claims (7)

1. Lightning arrester electrical test equipment, including an outer cylinder extending in the up and down direction, and a conductive rod is arranged in the outer cylinder, and the characteristic is that: the outer periphery of the conductive rod is equipped with a cylindrical shielding cover, and the shielding cover is arranged on the outer cylinder. The inside is supported and fixed by the outer cylinder. 2. The lightning arrester electrical test tool according to claim 1, characterized in that: the outer cylinder includes an insulating sleeve and a transition cylinder distributed along the up and down direction, and the shielding cover includes an inner shielding cover coaxially arranged and The outer shielding cover is arranged in the insulating sleeve, and the upper end of the inner insulating cover is arranged in the insulating sleeve and extends downward into the transition cylinder through the outer shielding cover. 3. The lightning arrester electrical test tool according to claim 2, characterized in that: a flange is fixedly installed between the lower end surface of the insulating sleeve and the upper end surface of the transition cylinder, and the lower end of the outer shield is supported and fixed on the flange. On the upper end surface of the blue plate, the lower end surface of the flange plate is fixed with a sleeve-shaped insulating seat extending downward into the transition cylinder for inserting the inner shield. The opening of the lower end of the insulating seat is smaller than the upper end, and the inner The lower end support of the shielding cover is fixedly assembled at the lower end opening of the insulating base. 4. The lightning arrester electrical test tool according to claim 3, characterized in that it comprises an upper cover plate arranged on the upper end of the insulating sleeve, and a pressure equalizing ring is fixedly mounted on the upper end surface of the upper end cover. 5. According to claim 4, said lightning arrester electrical test tool, it is characterized in that: it includes a wiring device fixed on the upper side of the upper cover, the wiring device includes a wiring board, and the wiring board is provided with wiring holes for inserting high-voltage wires and Fixing bolts for fixing high-voltage lines. 6. The lightning arrester electric test tool according to claim 3, characterized in that: the lower end of the outer shield is fixed with a ring-shaped first base, and the outer edge of the first base has protrusions uniformly distributed along the circumferential direction, said The convex part and the upper end surface of the flange are correspondingly provided with a first installation hole, the upper end surface of the flange and the first base are fixedly connected by bolts inserted in the first installation hole, the upper end surface of the insulating seat and the flange A second installation hole is correspondingly opened on the plate, and the second installation hole is correspondingly arranged in the gap between the adjacent protrusions, and the lower end surface of the flange plate and the lower end surface of the insulating seat are inserted into the second installation hole The bolts are fixedly connected, the lower end of the inner shield is fixed with an annular second base, and the lower end surface of the insulating base is fixedly connected with the upper end surface of the second base by bolts. 7. The lightning arrester electrical test tool according to claim 4, characterized in that: the pressure equalizing ring is an annular cylindrical structure, the pressure equalizing ring includes an upper pressure equalizing ring and a lower pressure equalizing ring, and the upper and lower pressure equalizing rings are along the vertical direction distribution, the upper and lower brackets are fixed on the upper cover through bolts, the upper and lower equalizing rings are respectively welded to the upper and lower brackets, and the upper and lower equalizing rings are respectively fixed and assembled on the upper cover through upper and lower brackets superior.