CN216900690U

CN216900690U - Metal oxide arrester leakage current detection device

Info

Publication number: CN216900690U
Application number: CN202220358147.8U
Authority: CN
Inventors: 郭鹏飞; 张俊; 张忠良; 孙明黎; 左志阳; 李海东
Original assignee: China Railway Electrification Wuhan Design and Research Institute Co Ltd
Current assignee: China Railway Electrification Wuhan Design and Research Institute Co Ltd
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-07-05
Anticipated expiration: 2032-02-22

Abstract

The utility model relates to the technical field of lightning arrester detection, in particular to a metal oxide lightning arrester leakage current detection device, which comprises a fixed platform, wherein a support frame is arranged on the fixed platform; a first bearing platform used for assembling a lightning arrester and a second bearing platform used for assembling a direct-current high-voltage generator are sequentially arranged on two sides of the supporting frame; the support frame is also provided with a first lifting component and a second lifting component which are respectively connected with the first bearing platform and the second bearing platform. Through under the regulation at first lifting unit and second lifting unit, can self-adaptation adjustment arrester and direct current high voltage generator etc. check out test set's height to the contained angle of control arrester and high test wire can accurate adjustment lead angle allowed deviation within the scope, thereby has reduced stray current and has detected the interference of data to it, has guaranteed the detection precision.

Description

Metal oxide arrester leakage current detection device

Technical Field

The utility model relates to the technical field of lightning arrester detection, in particular to a metal oxide lightning arrester leakage current detection device.

Background

The primary task of high-voltage electrical equipment is safe and reliable power supply, and any fault and power failure can affect the industrial and agricultural production and the normal transportation order of railways, thereby causing huge loss to national economy. The metal oxide arrester is the most advanced protective electrical appliance for limiting overvoltage, and is the basis of insulation matching of electrical equipment. The insulating material is widely applied to power generation, transmission, transformation and distribution systems, and the insulation of electrical equipment is prevented from being damaged by overvoltage.

In order to check the nonlinear characteristics and the insulating property of the valve plate, a direct current reference voltage is specified for the metal oxide resistance valve plate or the whole gapless metal oxide lightning arrester. Under the action of the direct current voltage, the voltage drop U1mA of the leakage current which flows through the resistance card or the lightning arrester and is equal to 1mA is used as the direct current reference voltage of the metal oxide lightning arrester, so that the design, the manufacture and the performance detection of the metal oxide lightning arrester are carried out.

The direct-current high-voltage generator is generally adopted to detect leakage current in the test process, and the lightning arresters are mounted in large quantity and are scattered in places, so that the lead wires need to be detached in the test process, the lightning arrester is mounted and used after the test is qualified, and the lightning arrester is mounted and used after the test is passed, so that the whole process is relatively time-consuming and labor-consuming. In addition, because there is certain deviation in the included angle between the high-voltage test line between arrester and the high-voltage generator, the stray current that causes that the electric capacity field that leads to the existence of circuit itself causes the interference of leakage current detection.

SUMMERY OF THE UTILITY MODEL

The utility model provides a metal oxide arrester leakage current detection device aiming at the technical problems in the prior art, and aims to solve the problem that the arrester is easily interfered by stray current when the arrester is subjected to leakage current detection.

The technical scheme for solving the technical problems is as follows: a metal oxide arrester leakage current detection device comprises a fixed platform, wherein a support frame is arranged on the fixed platform; a first bearing platform for assembling a lightning arrester and a second bearing platform for assembling a direct-current high-voltage generator are sequentially arranged on two sides of the support frame; the support frame is further provided with a first lifting component and a second lifting component which are respectively connected with the first bearing platform and the second bearing platform and are used for respectively driving the first bearing platform and the second lifting component to ascend or descend.

On the basis of the technical scheme, the utility model can be further improved as follows.

Further, the first lifting assembly comprises an adjusting seat, and a transmission screw rod is arranged in the adjusting seat along the vertical direction; the transmission screw rod is connected with a screw seat connected with the first bearing table in a driving way; the lower end of the transmission screw rod is also provided with a driving mechanism, and the driving mechanism is used for driving the transmission screw rod to rotate so as to drive the screw seat to move along the axial direction.

Furthermore, the first lifting assembly also comprises a guide rod which is arranged in parallel with the transmission screw rod; and a guide cylinder connected with the first bearing platform is matched on the guide rod in a sliding manner.

Furthermore, the guide bars are provided with two groups, and the two groups of guide bars are symmetrically distributed along the transmission screw rod.

Further, the driving mechanism comprises a turntable connected with the transmission screw rod; the turntable is provided with a handle.

Furthermore, the driving mechanism is formed by assembling a servo motor, and an output shaft of the servo motor is in driving connection with the transmission screw rod.

Furthermore, a plurality of cross beams which are arranged at intervals are erected on the first bearing table; and lightning arrester mounting brackets are arranged on the two adjacent cross beams.

Furthermore, the upper surface of the fixed platform is also provided with a plurality of reinforcing ribs which are uniformly distributed along the circumferential direction of the support frame.

The utility model has the beneficial effects that: according to the metal oxide arrester leakage current detection device, the heights of detection equipment such as the arrester and a direct current high-voltage generator can be adjusted in a self-adaptive mode under the adjustment of the first lifting assembly and the second lifting assembly, so that the included angle between the arrester and a high test line can be controlled, the allowable deviation range of the lead angle can be adjusted accurately, the interference of stray current on detection data is reduced, and the detection precision is guaranteed.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a portion of a first lift assembly according to the present invention;

FIG. 3 is a partial cross-sectional view of a first lift assembly of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. fixed platform, 2, support frame, 3, first plummer, 4, second plummer, 5, first lifting unit, 51, adjust the seat, 52, transmission lead screw, 53, screw seat, 54, actuating mechanism, 541, carousel, 542, handle, 55, guide bar, 56, guide cylinder, 6, second lifting unit, 7, crossbeam, 8, arrester installing support, 9, strengthening rib, 101, arrester body, 102, direct current high voltage generator body.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.

It should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are intended to be construed broadly, as if they were connected either fixedly or removably, or as integrally formed structures. To those of ordinary skill in the art, the specific meaning of such terms in this patent may be understood as appropriate.

The leakage current value under 0.75 times of direct current reference voltage is not larger than 50uA or accords with the specification of product technical conditions based on the 2 nd rule of GB 50150-2016 (China national standards for Electrical device installation engineering Electrical Equipment Handover test Standard) 20.0.5.

According to the traditional detection method, the leakage current value of the multi-column parallel arrester, the arrester with rated voltage of 216KV and above, and the arrester with the equalizing ring is far larger than 50uA due to various interferences, so that the insulation performance of the valve plate cannot be accurately judged in a handover test and a preventive test. The included angle between the high-voltage test wires between the lightning arrester and the direct-current high-voltage generator has certain deviation, so that stray current caused by a capacitance field existing in a line per se causes interference of leakage current detection. The arrester is if single standing when experimental with the same flat ground of direct current high voltage generator, obvious electric capacity field interference can not appear, in case after with arrester and relevant check out test set assembly, owing to high test line angular deviation appears, causes the stray current of production to disturb leakage current detection, then can influence final testing result, easily exists very big test error.

Through a plurality of tests of the inventor, the allowable angle deviation is +/-22 degrees when the included angle between the metal oxide arrester and the high test line is 113 degrees, and the actual field test result shows that: the larger the angular deviation is, the lower the actual measurement accuracy is. In the leakage current detection of the technical oxide lightning arrester with the multi-column parallel connection and the rated voltage of 216kv and above, once the leakage current exceeds the range of the allowable deviation of the angle, the detection data is seriously interfered by the stray current. Accordingly, the present invention is directed to a metal oxide arrester leakage current detection apparatus to solve the above problems.

Examples of the utility model

As shown in fig. 1, the device for detecting leakage current of metal oxide arrester of the present utility design comprises a fixed platform 1, wherein a support frame 2 is arranged on the fixed platform 1; a first bearing platform 3 for assembling a lightning arrester and a second bearing platform 4 for assembling a direct-current high-voltage generator are sequentially arranged on two sides of the support frame 2; the support frame 2 is further provided with a first lifting component 5 and a second lifting component 6 which are respectively connected with the first bearing platform 3 and the second bearing platform 4 and are used for respectively driving the first bearing platform 3 and the second lifting component 6 to ascend or descend. The utility model discloses a direct assembly arrester on first plummer 3, load check out test set such as direct current high voltage generator at second plummer 4, through under the regulation at first lifting unit 5 and second lifting unit 6, can self-adaptation adjustment arrester and direct current high voltage generator's height, thereby the contained angle ability accurate adjustment lead angle of control arrester and high test line is allowed within the deviation scope, thereby the interference of stray current to its detected data has been reduced, the detection precision has been guaranteed. And the mode that the vertical height of the arrester can be adjusted is adopted, so that the problem that the arrester lead wire needs to be disassembled in the process of preventive test can be effectively avoided, and great potential safety hazards can be effectively avoided when the high-level power transmission line is subjected to high-altitude lead wire disassembling operation.

The device for detecting the leakage current of the metal oxide arrester not only can be used as a traditional arrester installation and fixing instrument, but also can adjust the height difference of the arrester or corresponding detection equipment according to the detection requirement to reduce the interference of stray current. The whole device can be suitable for detecting 0.75 time of leakage current under the direct current 1mA reference voltage of the specialized 27.5kV metal oxide lightning arrester of the electrified railway, and is also suitable for detecting 0.75 time of leakage current under the direct current 1mA reference voltage of the metal oxide lightning arrester with the voltage class of 110kV and above of a power system, and the detection efficiency and the detection precision are ensured.

Specifically, as shown in fig. 2 and 3, the first lifting assembly 5 includes an adjusting seat 51, and a transmission screw 52 is vertically disposed in the adjusting seat 51; the transmission screw rod 52 is connected with a screw seat 53 which is connected with the first bearing table 3 in a driving way; the lower end of the transmission screw 52 is further provided with a driving mechanism 54, the driving mechanism 54 is used for driving the transmission screw 52 to rotate so as to drive the screw seat 53 to move along the axial direction, and the driving mechanism 54 drives the transmission screw 52 to rotate so as to generate an axial force to drive the first bearing table 3 to move to a specified height.

It should be noted that the first lifting component 5 and the second lifting component 6 both aim at achieving lifting in the vertical direction, and in this embodiment, the second lifting component 6 and the first lifting component 5 are both screw rod type driving components, so that redundant description is not repeated.

Wherein, the first lifting assembly 5 further comprises a guide rod 55 arranged in parallel with the transmission screw 52; sliding fit has the guide cylinder 56 who links to each other with first plummer 3 on guide bar 55, and guide bar 55 is provided with two sets ofly, and two sets of guide bars 55 further promote the stability of first plummer 3 through wire guide 55 and the cooperation of guide cylinder 56 along transmission lead screw 52 symmetric distribution, can reduce the side stress to guide cylinder 56 simultaneously, and overall structure intensity is better.

It should be noted that the driving mechanism 54 includes a rotary plate 541 connected to the driving screw 52; the handle 542 is arranged on the rotary plate 541, and an operator can rotate the handle 542 to drive the rotary plate 541 to rotate so as to drive the transmission screw rod 52 to rotate forwards and backwards, thereby controlling the lightning arrester to ascend and descend. In addition, the driving mechanism 54 is formed by assembling a servo motor, an output shaft of the servo motor is in driving connection with the transmission screw rod 52, the first bearing table 3 or the second bearing table 4 can be controlled to lift in an electrically driving mode by directly controlling the servo motor, and time and labor are saved.

Specifically, a plurality of cross beams 7 arranged at intervals are erected on the first bearing table 3; be provided with arrester installing support 8 on two adjacent crossbeams 7, can install a plurality of arrester installing supports 8 simultaneously through crossbeam 7, can realize assembling the parallelly connected arrester of many posts simultaneously, its whole assembly efficiency is higher, also makes things convenient for simultaneously follow-up to arrester leakage current to detect in proper order.

Specifically, fixed platform 1 upper surface still is provided with a plurality of strengthening ribs 9 along 2 circumference evenly distributed of support frame, and the bearing strength of support frame 2 is increased through the strengthening rib 9 that sets up, and stability is higher.

The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The device for detecting the leakage current of the metal oxide arrester is characterized by comprising a fixed platform (1), wherein a support frame (2) is arranged on the fixed platform (1); a first bearing platform (3) used for assembling a lightning arrester and a second bearing platform (4) used for assembling a direct-current high-voltage generator are sequentially arranged on two sides of the support frame (2); the support frame (2) is further provided with a first lifting component (5) and a second lifting component (6) which are respectively connected with the first bearing platform (3) and the second bearing platform (4) and are used for respectively driving the first bearing platform (3) and the second lifting component (6) to ascend or descend.

2. The metal oxide arrester leakage current detection device according to claim 1, wherein the first lifting assembly (5) comprises an adjusting seat (51), and a transmission screw rod (52) is vertically arranged in the adjusting seat (51); the transmission screw rod (52) is connected with a screw seat (53) connected with the first bearing table (3) in a driving way; the lower end of the transmission screw rod (52) is further provided with a driving mechanism (54), and the driving mechanism (54) is used for driving the transmission screw rod (52) to rotate so as to drive the screw seat (53) to move axially.

3. The metal oxide arrester leakage current detection apparatus according to claim 2, wherein the first elevating assembly (5) further includes a guide rod (55) arranged in parallel with the transmission screw (52); and a guide cylinder (56) connected with the first bearing table (3) is matched on the guide rod (55) in a sliding way.

4. A metal oxide arrester leakage current detection apparatus according to claim 3, characterized in that the guide rods (55) are provided in two sets, the two sets of guide rods (55) being symmetrically distributed along the drive screw (52).

5. A metal oxide arrester leakage current detection apparatus as claimed in claim 2, characterized in that the drive mechanism (54) comprises a rotary plate (541) connected to the transmission screw (52); the rotary plate (541) is provided with a handle (542).

6. The device for detecting the leakage current of the metal oxide arrester as claimed in claim 2, wherein the driving mechanism (54) is assembled by a servo motor, and an output shaft of the servo motor is in driving connection with the transmission screw rod (52).

7. The metal oxide arrester leakage current detection device according to claim 1, wherein the first carrier (3) is provided with a plurality of beams (7) arranged at intervals; and lightning arrester mounting brackets (8) are arranged on the two adjacent cross beams (7).

8. The metal oxide arrester leakage current detection device according to claim 1, wherein the upper surface of the fixing platform (1) is further provided with a plurality of reinforcing ribs (9) uniformly distributed along the circumferential direction of the support frame (2).