CN204679591U - A kind of leakage conductor state measuring device with electricity based on electric field method - Google Patents

Abstract

A live detection device for the state of a line arrester based on an electric field method, the device is composed of an electric field sensor, a positioning clamp, an insulating operating rod, a display, a signal transmission line, a fixing device for the display, a rotatable bolt and a connecting head of the operating rod. The electric field sensor is installed on the positioning clamp; the insulating operating rod is connected to the handle of the positioning clamp through a rotatable bolt; the display is installed on the upper part of the insulating operating rod through a display fixing device; the electric field sensor is connected to the display through a signal transmission line. The device of the utility model has the advantages of non-stop power supply, non-contact, simple operation, accurate results, etc., can greatly improve the detection efficiency of the line arrester state, evaluate the insulation state of the line arrester, and is of great significance to the safe and stable operation of the line arrester.

Description

A live detection device for line arrester status based on electric field method

technical field

The utility model relates to a live detection device for the state of a line lightning arrester based on an electric field method, which belongs to the technical field of operation, maintenance and repair of high-voltage power transmission and transformation equipment.

Background technique

In order to improve the high lightning tripping rate of transmission lines, since 2011, the State Grid Corporation of China has vigorously promoted the differential lightning protection renovation project of transmission lines. A series of measures such as lightning receptors, controllable discharge lightning rods, negative angle protection pins, and coupling ground wires have achieved remarkable results. In particular, the lightning protection effect of the line arrester is extremely significant, and the tower equipped with the line arrester will hardly have a lightning tripping event.

Line arrester is currently the most reliable lightning protection measure for transmission lines, and its application effect has been unanimously recognized by power grid companies, and the number of grid-connected operations has also increased rapidly. With the increase in the number of line arresters in operation, line lightning tripping has been effectively controlled, but at the same time, the operation and maintenance of line arresters has also become a prominent issue in front of the power supply company. The current line surge arrester standard DL/T 815-2012 "Composite jacket metal oxide arrester for AC transmission lines" only proposes "regular line inspection (at least once a year, before the thunderstorm season) for line arresters with gaps, and visual inspection of the appearance of the arrester. damage, and record the action data of the counter", but from the existing operating experience, there have been major defects and failures in the line arrester body and the series gap, and with the increase of operating time, the failure rate will inevitably continue Increase. How to detect the operating state of the line arrester, especially the internal insulation state, is a problem that the power company is very concerned about.

If the routine power failure test is carried out according to the lightning arrester used in the substation, the line lightning arrester needs to be dismantled and returned to the ground for testing. The workload is huge and involves long-term power failure. It is unrealistic in terms of test safety, workload and power supply reliability.

Therefore, from the two aspects of safe operation of equipment and inspection efficiency, it is urgent to study a live detection device that can safely and efficiently detect the insulation state of the line arrester.

Contents of the invention

The purpose of the utility model is, in order to solve the problems existing in the operation and maintenance of the existing line arrester, to propose a live detection device for the state of the line arrester based on the electric field method.

The technical solution for realizing the utility model is that a line lightning arrester state charging detection device based on the electric field method is composed of an electric field sensor, a positioning clamp, an insulating operating rod, a display, a signal transmission line, a display fixing device, a rotatable bolt and a connecting head of the operating rod. . The electric field sensor is installed on the positioning clamp; the insulating operating rod is connected to the handle of the positioning clamp through a rotatable bolt; the display is installed on the upper part of the insulating operating rod through a display fixing device; the electric field sensor is connected to the display through a signal transmission line.

The positioning pliers have a crescent-shaped structure, the middle part of the convex surface of the positioning pliers is provided with a positioning pliers handle, and the middle part of the concave surface of the positioning pliers can be installed with an electric field sensor.

The insulated operating rod is composed of foldable multi-section struts, and each strut is connected by the connecting head of the operating rod.

The working principle of the present invention is: the present invention is based on the principle that the internal insulation defects of the line arrester body and the supporting composite insulator will cause the surface axial electric field to change. The distribution curves are compared to find the internal insulation defect of the arrester and accurately locate the defect location.

The beneficial effect of the utility model is that the utility model device has the advantages of non-stop power supply, non-contact, easy operation, and accurate results, etc., can greatly improve the detection efficiency of the line arrester state, evaluate the insulation state of the line arrester, and play an important role in the safe and stable operation of the line arrester. significance.

Description of drawings

Figure 1 is a schematic diagram of a live detector for line arresters using the electric field method.

Fig. 2 is a schematic diagram of live detection of line arrester by electric field method.

The figure numbers in the figure are: 1 is the electric field sensor; 2 is the positioning clamp; 3 is the insulating operating rod; 4 is the display; 5 is the signal transmission line; 6 is the display fixing device; 7 is the rotatable bolt; 9 is the inspector; 10 is the electric field tester; 11 is the line lightning arrester; 12 is the cross arm of the tower; 13 is the transmission line.

Detailed ways

The structure of this embodiment is shown in Figure 1. In this embodiment, a live detection device for line arrester status based on the electric field method is composed of an electric field sensor 1, a positioning clamp 2, an insulating operating rod 3, a display 4, a signal transmission line 5, a display fixing device 6, a rotatable bolt 7 and an operating rod connector. 8 composition. The electric field sensor is installed on the positioning clamp; the insulating operating rod is connected to the handle of the positioning clamp through a rotatable bolt; the display is installed on the upper part of the insulating operating rod through a display fixing device; the electric field sensor is connected to the display through a signal transmission line.

The specific embodiment of the utility model is shown in Figure 2.

First, design the measurement data recording form, set the measurement points, and recommend setting a measurement point at the position of the large umbrella shed of each composite jacket; then the ground potential electrified worker 9 carries the electric field measuring instrument component to the tower; the third step is to assemble the detector 10 , adjust the opening angle of the positioning clamp and the angle of the display to facilitate operation and reading; the fourth step is to carry out electric field detection, and move the detector probe along the surface of the line arrester 12 to ensure that the distance between the probe and the central axis of the line arrester is fixed. Read the electric field value at one point, record it on site or transmit the measurement data to the ground personnel through the walkie-talkie; finally compare and analyze the measurement results with the electric field distribution results on the surface of the normal line arrester, determine the nature and location of the defect, and formulate follow-up maintenance strategies.

Claims (3)

1. the leakage conductor state measuring device with electricity based on electric field method, it is characterized in that, described electric field method leakage conductor live detection instrument is made up of electric-field sensor, positioning clamp, insulating bar, display, signal transmssion line, display fixing device, rotatable bolt and control lever connector; Electric-field sensor is arranged on positioning clamp; Insulating bar connects the shank of positioning clamp by rotatable bolt; Display is arranged on the top of insulating bar by display fixing device; Electric-field sensor connects display by signal transmssion line.

2. a kind of leakage conductor state measuring device with electricity based on electric field method according to claim 1, it is characterized in that, described positioning clamp is falcate structure, and positioning clamp convex surface middle part is provided with location clamp handle, and electric-field sensor can be installed in positioning clamp concave surface middle part.

3. a kind of leakage conductor state measuring device with electricity based on electric field method according to claim 1, it is characterized in that, insulating bar is made up of folding more piece pole, connects each pole by control lever connector.