CN202196146U - On-line detecting device for electric power circuit insulator - Google Patents

Abstract

The utility model discloses an on-line detection device for power line insulators, which comprises a conductor, a detection circuit and a display for displaying numerical values that are electrically connected in sequence, and a hollow spacer that is used to carry the conductor, the detection circuit and the display and is insulated from it. A type telescopic rod, wherein the conductor is located at the top of the telescopic rod and extends out of the telescopic rod, the detection circuit is arranged on the inner wall of the telescopic rod, and the display is arranged on the outer wall of the telescopic rod. The utility model has the advantages of simple structure and convenient operation, and can accurately detect the insulation state of each shed on the insulator in the power line.

Description

Power line insulator online detection device

technical field

The utility model relates to an instrument commonly used in the field of electric power system, in particular to a detection device for whether the insulating porcelain bottle in the side power line is normal.

Background technique

In the high-voltage transmission network, the insulator is used to increase the creepage distance between the wire and the iron tower. The resistance value of the insulator directly affects the stable operation of the high-voltage transmission line. Once the insulator has a zero value, it must be replaced, otherwise it will be damaged. It will affect the operation of the power grid, and seriously cause flashover tripping accidents. However, due to the particularity of the installation position of the insulator and the harshness of the detection environment, the on-line detection of the insulator becomes extremely difficult.

At present, the most commonly used method for detecting insulators on power lines in power systems is the electric field method. The electric field method is a method for judging the internal continuity fault according to the distribution of the longitudinal electric field on the surface of the insulator. That is to say, when the insulator contains conductive When a continuity defect or a zero-value insulator is included in the porcelain insulator string, the electric field around it will be distorted, and the purpose of detection can be achieved by comparing it with the standard electric field distribution when there is no defect. The circuit part of the insulator detection device based on this method is relatively complicated, and the cost is also high; and the signal processing circuit part is affected by the high-voltage signal, and the signal is prone to deviation.

When these detection devices are used to detect insulators, they must be climbed to the iron tower where the insulator is located for measurement. Due to the large size of the detection devices, not only is it inconvenient to carry, but also when the detection is carried out on the iron tower, the device has no place to place, which brings great inconvenience to the operator. Inconvenient, seriously affecting the safety of the operator. If placed on the transmission line for a long time, not only the construction cost will be greatly increased, but also extremely unsafe. In addition, insulators are composed of multiple sheds in series, and the current detection device can only measure whether the entire insulator is defective, and cannot detect each shed.

Utility model content

The technical problem to be solved by the utility model is to provide a detection device which has a simple structure and can accurately detect whether there is a continuity defect in the insulator in the power line, or even in each shed on the insulator.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is.

The on-line detection device for power line insulators includes a conductor, a detection circuit and a display for numerical display that are electrically connected in sequence, and a hollow telescopic rod for carrying the conductor, the detection circuit and the display and is insulated from it. The body is located on the top of the telescopic rod and stretches out of the telescopic rod, the detection circuit is arranged in the telescopic rod, and the display is arranged on the outer wall of the telescopic rod; the detection circuit includes a signal processing module, a control module and an analog-to-digital conversion module, and the signal processing module The input end of the control module is connected to the conductor, the input end of the control module is connected to the output end of the signal processing module, and the output end of the control module is connected to the display through the analog-to-digital conversion module.

Owing to adopting above-mentioned technical scheme, the technological progress that the utility model obtains is.

The utility model has the advantages of simple structure, small volume and convenient operation. The electric conductor is used to test whether there is a continuity defect between the adjacent sheds of the insulator. After the signal is processed by the signal processing module, it is controlled by the control module. After the analog-to-digital conversion, it will be visually displayed on the display, so that the staff can keep track of the insulation status of each shed of the insulator at any time, and replace the insulator in a planned way according to the detection situation, rather than when the entire insulator has a zero value Only then can it be found that the occurrence of larger accidents on power lines has been avoided. With the utility model, workers can complete the detection work directly on the ground without climbing, which avoids the danger of high-altitude operations, ensures the safety of the working environment of the workers, reduces the labor intensity of the workers, and improves the labor efficiency.

Description of drawings

Figure 1 is a schematic diagram of the utility model in use.

Among them: 1. Insulator, 2. Shed, 3. Conductor, 4. Signal processing module, 5. Control module, 6. Telescopic rod, 7. Analog-to-digital conversion module, 8. Display.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

An on-line detection device for power line insulators is shown in Figure 1. It mainly includes a telescopic rod 6, a detection circuit, a display 8 and two conductors 3. The telescopic rod is hollow, and the detection circuit, the display, and the conductor are all insulated from the telescopic rod.

The detection circuit is fixedly arranged on the innermost cavity side wall of the telescopic rod. The display adopts a small liquid crystal display screen, which is arranged on the outermost surface of the telescopic rod, so that the staff can read the data conveniently. The two conductors are located at the top of the telescopic rod and extend out of the telescopic rod for measuring the potential difference between two measuring points of the insulator, and the two conductors are insulated.

The detection circuit includes a signal processing module 4 , a control module 5 and an analog-to-digital conversion module 7 . The input end of the signal processing module is connected to the conductor, which is used to convert the potential difference between the two measuring points of the insulator measured by the conductor into a weak voltage signal and transmit it to the control module. The input terminal of the control module is connected to the output terminal of the signal processing module, which is used to analyze whether the potential difference signal measured by the conductor is consistent with the standard potential difference between the two measurement points of the normal insulator, and transmit the analysis results and measurement results to the analog-to-digital conversion Module, the analog-to-digital conversion module converts the analog signal into a digital signal and then transmits it to the display for display.

When the utility model is working, firstly, according to the height of the insulator, the position of the conductor of the utility model is adjusted by adjusting the telescopic rod, so that the two conductors are respectively in contact with the upper and lower sides of each umbrella skirt 2, and the potentials of the upper and lower sides of the umbrella skirt are measured. Difference. The measured potential difference is displayed on the display after being processed by the signal processing module, analyzed by the control module and converted by the analog-to-digital conversion module.

The normal measurement result should be consistent with the standard potential difference stored in the control module. When the measurement result is zero or significantly lower than the standard potential difference, it means that the shed of the insulator has been broken down or there is a continuity defect.

Claims (1)

1. An online detection device for power line insulators, including a conductor (3) electrically connected in sequence, a detection circuit and a display (8) for displaying numerical values, characterized in that it also includes a conductor for carrying, a detection circuit and a display The hollow telescopic rod (6), the telescopic rod is insulated from the conductor, the detection circuit and the display, wherein the conductor (3) is located on the top of the telescopic rod and extends out of the telescopic rod, and the detection circuit is set on the telescopic rod On the inner wall of the innermost cavity, the display is set on the outer wall of the telescopic rod; the detection circuit includes a signal processing module (4), a control module (5) and an analog-to-digital conversion module (7), and the signal processing module (4) The input end of the control module (5) is connected to the conductor (3), the input end of the control module (5) is connected to the output end of the signal processing module (4), and the output end of the control module (5) is connected to the display (8) via the analog-to-digital conversion module (7). .

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