CN105846330B - For arrester charged for replacement leakage current table special complete instrument and operational method - Google Patents

Abstract

A complete set of special tools for replacing the leakage current meter of the lightning arrester, including a tool box. The tool box includes an upper cover and a box body. Both the upper cover and the box body are made of insulating materials. There are screw holes on the upper cover and the box body. The positions of the screw holes and the screw holes on the box body are corresponding, and an insulating support is connected between the screw holes of the loam cake and the screw holes of the box body, and the insulating support is a porcelain insulator or a composite insulator. Replace the new work mode that can be carried out under the live state, avoiding the need for power failure.

Description

A special set of tools and working methods for replacement of leakage current meters for surge arresters

technical field

The invention relates to a maintenance device for replacing a leakage current meter with electricity on a lightning arrester.

Background technique

Surge arrester is one of the important protection devices to ensure the safe operation of the power system. It is mainly used to limit the overvoltage of the system. The leakage current is a very important reference index for evaluating the quality of the arrester. If the leakage current meter fails, it may cause leakage current error. Therefore, it is very important to keep the leakage current meter of the arrester in good condition at all times. At present, most operation and maintenance personnel replace the leakage current meter by first applying for a power outage through dispatching, and then complete the replacement of the faulty leakage current meter when the equipment is not charged. The maintenance cycle is long and the reliability of the system power supply is reduced.

Contents of the invention

The purpose of the present invention is to provide a special tool set and operation method for replacing the leakage current meter of the lightning arrester when it is live, which can realize the replacement of the leakage current meter of the lightning arrester fault when it is charged, avoiding the application for dispatching power outages, saving time, and improving the reliability of the system power supply .

Technical scheme of the present invention is:

A complete set of special tools for replacing the leakage current meter of the lightning arrester, including a tool box. The tool box includes an upper cover and a box body. Both the upper cover and the box body are made of insulating materials. There are screw holes on the upper cover and the box body. The positions of the screw holes and the screw holes on the box body correspond to each other. There is an insulating post connected between the screw hole on the upper cover and the screw hole on the box body. Inside the body are placed a grounding downconductor continuity tester, a multimeter and a short-connected copper strip with fixing bolts.

Both the upper cover and the box body are made of epoxy resin.

The screw holes are located at the four corners of the loam cake and the four corners of the box body.

There are two short copper strips.

The cross-section of the short-connected copper strip is 60mm*10mm, and the length is 0.8m.

Use the above-mentioned special complete set of tools for the operation method of replacing the leakage current meter while the arrester is live, and the specific steps are as follows:

Step 1: The arrester is connected with a leakage current meter. Before replacing the faulty leakage current meter, the operator confirms that the resistive current live test result of the arrester is qualified, and the arrester body is normal; if the arrester body is defective, stop the operation;

Step 2: Operators use the grounding downconductor continuity tester to judge whether the connection between the grounding downconductor of the arrester and the main ground network is good, and the grounding of the arrester should be reliable;

Step 3: The operator uses the upper cover, the box body and the insulating support to assemble a simple insulating support, and then starts to work; the purpose of using the insulating support is to protect the operator and prevent the operator from being injured by the floating potential caused by misoperation;

Step 4: The operator uses a short-circuit copper tape with fixed bolts to short-circuit the leakage current meter. The short-circuit copper tape should be reliably short-circuited. At this time, the reading of the leakage current meter should return to zero. The upper lead of the ammeter and the grounding down lead are reliably connected;

Step 5: After reliably shorting the leakage current meter, use tools to replace the leakage current meter, and the replaced leakage current meter should read well;

Step 6: Remove the short-circuit copper strip;

Step 7: Clean up the site and confirm that there are no leftover objects.

In step 4, the operator uses two short-circuit copper strips with fixed bolts to short-circuit the leakage current meter. Both short-circuit copper strips should be reliably short-circuited. At this time, the reading of the leakage current meter should return to zero. In consideration of double insurance, prevent one from loosening and falling off.

The tool of the present invention ensures that the replacement of the leakage current meter of the lightning arrester can be carried out in a charged state, avoiding the need for power failure; the special tool is placed in a set, the wiring is simple and reliable, easy to carry and install, saves time and effort, and can greatly improve work efficiency; The combined insulation bracket better guarantees the safety of personnel during operation.

After confirming that there is no abnormality in the arrester body, the operator can use the special set of tools to replace the leakage current meter. Under the condition of ensuring the reliable grounding of the arrester, the operator wears insulating boots and stands on a special insulating support to reliably short-circuit the leakage current meter with two short-circuit copper straps with fixed bolts, and then replace the faulty leakage current meter with tools and tools. Finally, ensure that the leakage current meter is reliably connected to the main circuit, and finally remove the short-circuit copper strip to clean up the site. This special set of tools ensures that the replacement of the leakage current meter of the arrester can be carried out in a live state, avoiding the need for power failure; the special tools are placed in a set, the wiring is simple and reliable, easy to carry and install, saves time and effort, and can greatly improve work efficiency; The combined insulating support can better guarantee the safety of personnel during operation, has a wide range of applications, and has good market prospects and application values.

The beneficial effects of the present invention are:

(1) Through the insulation bracket and the short-connected copper strip, this device effectively ensures the new operation method that the replacement of the leakage current meter of the arrester can be carried out in the live state, avoiding the need for power failure;

(2) The device is placed in a complete set with special tools, the wiring is simple and reliable, easy to carry and install, saves time and effort, and can greatly improve work efficiency;

(3) This device better guarantees the safety of personnel during operation through the simple combined insulating bracket.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is the working principle figure of working method step 2 of the present invention;

Fig. 3 is the working principle figure of step 4 and step 5 of the working method of the present invention.

In the figure: 1. lightning arrester, 2. box body, 3. grounding downconductor continuity tester, 4. multimeter, 5. adjustable wrench, 6. dead wrench, 7. insulating support, 8. short Connect copper strip, 9, screw hole, 10, loam cake.

detailed description

As shown in Fig. 1, when the present invention performs the work of replacing the leakage current meter while the lightning arrester is live, the special tool set can be assembled in a modular manner and combined with various special tools.

The whole set of special tools is a toolbox. The upper cover 10 and the box body 2 of the toolbox are all pressed by insulating materials such as epoxy resin, and there are screw holes 9 at the corresponding positions of the four corners of the upper cover 10 and the box body 2. The screw holes 9 of the upper cover 10 and the box body 2 are used to fix the insulating support 7. The insulating support 7 should be a porcelain insulator or a composite insulator with an umbrella skirt, good insulation and reliable strength. There are screws at both ends of the arrester 1, which can be fixed on Four corner screw holes 9.

The staff can stand on the upper cover 10 of the toolbox when replacing the leakage current meter 13 with electricity; inside the box body 2 there is a grounding downconductor continuity tester 3, a multimeter 4, an adjustable wrench 5, a dead wrench 6, and an insulating support 7 And the short-connected copper strip 8 with fixing bolts, the short-connected copper strip 8 is two, the section is 60mm*10mm, and the length is 0.8m.

The specific steps of the working method:

Step 1: Before replacing the faulty leakage current meter 13, the operator confirms that the arrester 1 resistive current live test result is qualified, and the arrester body is normal; if the arrester body is defective, this work cannot be performed.

Step 2: As shown in Figure 2, the operator uses the grounding downconductor continuity tester 3 to judge whether the connection between the grounding downconductor 12 of the arrester and the main ground network is good, and the grounding of the arrester 1 should be reliable.

Step 3: The operator uses the upper cover 10, the box body 2 and the insulating support 7 to assemble a simple insulating support. Before using the insulating support, it should be confirmed whether the support is stable, and then start the operation; the purpose of using the insulating support is to protect the operator and prevent operation Personnel are injured by floating potentials that may be caused by mishandling.

As shown in Figure 3,

Step 4: The operator uses two short-circuit copper strips 8 with fixing bolts to short-circuit the leakage current meter 13, and both wires must be reliably short-circuited. At this time, the reading of the leakage current meter 13 should return to 0. After short-circuiting, use the multimeter 4 to measure Whether the leakage current meter 13 is reliably connected to the upper lead wire 11 of the leakage current meter and the grounding down conductor 12. The use of two is for double insurance considerations to prevent one from loosening and falling off.

Step 5: After reliably short-circuiting the leakage current meter 13, replace the leakage current meter with adjustable wrench 5, blank wrench 6 and other tools. The replaced leakage current meter 13 should read well.

Step 6: Remove the short-circuit copper strip 8.

Step 7: Clean up the site and confirm that there are no leftover objects.

Claims (2)

1. The method of using a special set of tools to electrify the lightning arrester to replace the leakage current meter is characterized in that the special set of tools used includes a toolbox, and the toolbox includes an upper cover and a box body, which is characterized in that the upper cover and the box body are insulated There are screw holes on the upper cover and the box body, the positions of the screw holes on the upper cover and the screw holes on the box body are corresponding, and insulating pillars are connected between the screw holes on the upper cover and the screw holes on the box body. The insulating support is a porcelain insulator or a composite insulator, and screws are provided at both ends of the insulating support; a grounding downconductor continuity tester, a multimeter and a short-connected copper strip with fixing bolts are placed inside the box; the specific steps of the method are: Step 1: The arrester is connected with a leakage current meter. Before replacing the faulty leakage current meter, the operator confirms that the resistive current live test result of the arrester is qualified, and the arrester body is normal; if the arrester body is defective, stop the operation; Step 2: Operators use the grounding downconductor continuity tester to judge whether the connection between the grounding downconductor of the arrester and the main ground network is good, and the grounding of the arrester should be reliable; Step 3: The operator uses the upper cover, the box body and the insulating support to assemble a simple insulating support, and then starts to work; the purpose of using the insulating support is to protect the operator and prevent the operator from being injured by the floating potential caused by misoperation; Step 4: The operator uses a short-circuit copper tape with fixed bolts to short-circuit the leakage current meter. The short-circuit copper tape should be reliably short-circuited. At this time, the reading of the leakage current meter should return to zero. The upper lead of the ammeter and the grounding down lead are reliably connected; Step 5: After reliably shorting the leakage current meter, use tools to replace the leakage current meter, and the replaced leakage current meter should read well; Step 6: Remove the short-circuit copper strip; Step 7: Clean up the site and confirm that there are no leftover objects. 2. The operation method for replacing the leakage current meter when the lightning arrester is live according to claim 1, characterized in that: in step 4, the operator uses two short-connected copper strips with fixing bolts to short-circuit the leakage current meter, and the two The short-circuited copper strips should be reliably short-circuited. At this time, the reading of the leakage current meter should return to zero. The use of two is for double insurance considerations to prevent one from loosening and falling off.