CN108711778A - Six strain insulator of 550kN grades replaces tool and method - Google Patents

Abstract

The invention discloses a replacement tool for 550kN class six-connected tension insulators of ±1100 kV UHV DC transmission line, which includes a cross-arm side turning plate clamp, connecting plate, insulator closed clamp and two eight-ton hydraulic screw screws. The cross-arm side flap fixture is installed on the connecting plate, and the cross-arm side flap fixture is connected with the two ends of the insulator closed fixture through the connecting machine shaft, two hydraulic screw screws, and the other side of the insulator closed fixture It is hoisted on the insulator string of the DC transmission line, and the insulator closed clamp is installed on the steel cap of the front clamp of the insulator, so that it is integrated with the steel cap of the insulator. The blank of Lianai Zhang monolithic insulator replacement tool.

Description

550kN class six-connected tension insulator replacement tool and method

technical field

The invention relates to the technical field of power system maintenance, in particular to a replacement tool and method for 550kN level six-connected tension insulators of a ±1100 kV UHV DC transmission line.

Background technique

The ±1100KV transmission line of the Changji Line is an UHV transmission line. Most defective insulators are replaced by power-off methods, that is, maintenance and replacement are performed under power outage conditions. The traditional high-altitude live work to replace single-piece insulators is labor-intensive and relatively low efficiency. , There is no research on live working methods and tools related to the replacement of tension-resistant six-unit cross-arm end insulators.

The document with publication number CN 105337216 A discloses a tool and method for live replacement of tension insulators of UHV grounding pole lines, including a front clamping part, a lead screw, an insulating puller and a rear clamping part. The front clamping part adopts Bending card, the front clamping part is connected to one end of the screw, the other end of the screw is connected to one end of the insulating pull plate, and the other end of the insulating pull plate is connected to the rear clamping part , the length of the insulating pull plate is adjustable, and adjustment holes are evenly arranged on the insulating pull plate. During the process of using the tool to replace the tension insulator, the body part of the electrician should not exceed the first tension insulator on the side of the cross arm. Insulators, and keep a minimum safety distance of 0.6m. The ground electrician uses a temperature measuring instrument to detect the surface temperature of the wire. Once the temperature continues to rise and exceeds 60 degrees Celsius, promptly remind the No. 2 electrician at the equipotential place to avoid long-term contact with the high-temperature wire. Causing personal injury and ensuring the personal safety of the operating personnel, but this document requires 2-3 people to cooperate with the operation, the labor intensity is high, the efficiency is low, and the operation process is cumbersome, and it is not convenient enough to use.

The document with the publication number CN 105098655 A discloses a strain insulator replacement tool, which includes a first insulating end plate, a second insulating end plate, a wire gripper, at least two clamping plates and at least two stretchable insulating pull rods, The insulating pull rod is provided with a control handle for controlling expansion and contraction; the first insulating end plate and the second insulating end plate are respectively arranged at both ends of the insulating pull rod, and together with at least two insulating pull rods constitute an insulating tensioning frame; the clamping plate is erected on at least two On the first insulating rod, there is a concave arc-shaped gap for supporting the tension insulator on the clamping plate, and a connecting rod is pierced between two adjacent clamping plates. At least two clamping plates and the connecting rod together form a space for placing insulators. The bracket; the wire gripper is set on the first insulating end plate. Although this document has the characteristics of live replacement of tensile insulators, easy operation and high safety, this document is only applicable to the replacement of tensile insulators of ordinary transmission lines. It cannot be applied to the replacement of tension insulators of UHV DC transmission lines, and the material of the replacement tool in this document is an ordinary insulating end plate, which cannot improve the mechanical strength of the tool while reducing the weight.

Contents of the invention

In view of this, the object of the present invention is to address the deficiencies in the prior art, and provide a replacement tool and method for 550kN class six-connected tension insulators of ±1100 kV UHV DC transmission lines, which are used to replace ±1100KV power transmission in a power failure state. One string of the line tension six-unit insulator string and the insulator closed clamp are used to replace the first insulator at the cross-arm end, which fills the domestic ±1100 kV UHV DC line live work field of six-unit tension single-piece insulator replacement tools Whitespace.

To achieve the above object, the present invention adopts the following technical solutions:

A replacement tool for 550kN class six-connection tensile insulators of ±1100 kV UHV DC transmission lines, including cross-arm side-turning clamps, connecting plates, insulator closed clamps and two eight-ton hydraulic screw screws, the cross-arm The side flap fixture is installed on the connecting plate, and the cross-arm side flap fixture is connected with the two ends of the insulator closed fixture through the two hydraulic screw screws, and the insulator closed fixture The other side of the tool is hoisted on the insulator string of the direct current transmission line, and the insulator closed clamp is installed on the front clamping steel cap of the insulator, and is connected with the insulator steel cap as a whole.

Further, the connecting plate includes a triangular connecting plate and a right-angle hanging plate rotatably connected with the triangular plate, the triangular plate, the right-angle hanging plate, and the cross-arm side flap clamp are connected by bolts, and the cross-arm rollover The board fixture is connected with the steel cap of the insulator through the right-angle hanging board.

Further, the rated working load of the cross-arm side flap fixture and the closed insulator fixture are both 150kN, the test load is 225KN, and the safety factor is 2.5.

Further, the cross-arm side flap fixture forms an anchor point on the connecting plate through the bolt, and the insulator steel cap is the anchor point of the insulator end.

Further, the materials of the cross-arm side flap clamp and the insulator closed clamp are titanium alloy materials.

A method for replacing 550kN class six-connected tension insulators of ±1100 kV UHVDC transmission lines, comprising the following steps:

Step 1: Assemble the replacement tool for 550kN class six-connected tension insulators;

Step 2: Tighten the hydraulic screw to raise the wire to a certain height, and loosen the insulator string;

Step 3: Use a pin removal clip to remove the spring pin in the lower nut of the insulator, and replace the defective insulator;

Step 4: After replacing the defective insulator, loosen the hydraulic screw to transfer the horizontal load on the cross-arm side flap fixture to the insulator;

Step 5: Remove the replacement tool for 550kN class six-gang tension insulators.

Further, the assembly of the 550kN class six-connected tension insulator replacement tool in step 1 includes the following four steps:

A. Trial install the insulator closed fixture and hydraulic screw on the ground, and make sure it is correct;

B. Hoist the insulator closed fixture on the insulator string of the direct current transmission line through the pulley rope auxiliary tool;

C. Remove the bolts on the lower part of the cross-arm end flap fixture, install the cross-arm end flap fixture on the right-angle hanging plate and the triangular joint plate, install the bolts so that the cross-arm end flap fixture and The joint plate is connected as one;

D. Open the upper cover of the insulator, install the closed clamp of the insulator on the steel cap of the insulator, and close the upper cover of the insulator to connect the closed clamp of the insulator with the steel cap of the insulator.

The beneficial effects of the present invention are:

1. The present invention provides a tool for replacing insulators on the 550kN level tension-resistant six-connected cross-arm side of a ±1100 kV UHV DC transmission line. The end fixture is installed on the Z-55150 right-angle hanging plate and the L-110J-300/1000 triangular joint plate, and the screw is installed to connect it with the cross-arm side flap fixture as a whole, and the other end uses the insulator steel cap as an insulator After the hydraulic screw is tightened, the horizontal load of the insulator is transferred to the device, and the operation of removing and replacing the single-piece insulator is performed at this time. After the device is used, the labor intensity of replacing a single-piece insulator with live electricity at high altitude is greatly reduced, the working time is shortened, and the working efficiency is improved.

2. The insulator replacement tool’s cross-arm side flap fixture and insulator closed fixture are all made of titanium alloy, which not only reduces the volume of the tool itself, but also improves the mechanical strength of the tool, reduces the weight of the tool, and reduces the operation risk. Improve job security.

3. The rated working load of the cross-arm side flap fixture and insulator closed fixture in the insulator replacement tool of the present invention is 150kN, the test load is 225KN, the safety factor is 2.5 times, and the hydraulic screw screw is 8 tons. From the above main technical indicators , are currently ranked first in my country's similar live working tools.

4. The design concept of this jig is unique, the concept is novel, it has the advantages of few special parts, easy to assemble, easy to carry, simple to use, light in weight, etc., and has a high safety factor in use. The blank of replacement tools for grade six-connected tension single-piece insulators.

Description of drawings

Figure 1: The general assembly diagram of a 550kN class tension-resistant six-connector cross-arm side insulator replacement tool for a ±1100 kV UHV DC transmission line according to the present invention;

Figure 2: A three-dimensional view of the cross-arm side turning board clamp and connecting board assembly of a 550kN-class tension-resistant six-connected cross-arm side insulator replacement tool for a ±1100 kV UHV DC transmission line according to the present invention;

Figure 3: A cross-arm side-turning clamp and connecting plate assembly tooling of a 550kN-class tension-resistant six-connected cross-arm side insulator replacement tool for a ±1100 kV UHV DC transmission line according to the present invention;

Figure 4: Replacement steps of a 550kN class six-connected tension insulator for a ±1100 kV UHV DC transmission line according to the present invention.

Explanation of reference signs:

1. Fixture for cross-arm side flap, 2. Closed fixture for insulator, 3. Hydraulic screw, 4. Steel cap, 5. Triangular connecting plate, 6. Right-angle hanging plate, 7. Bolt.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

As shown in Figure 1, a replacement tool for 550kN class six-connected tension insulators of ±1100 kV UHV DC transmission line, including cross-arm side-turn plate clamp 1, connecting plate, insulator closed clamp 2 and two eight-ton The hydraulic screw 3, the cross-arm side flap fixture 1 is installed on the connecting plate, the cross-arm side flap fixture 1 passes through the two hydraulic screw screws 3 and the insulator closed fixture The two ends of the insulator 2 are connected, and the other side of the insulator closed fixture 2 is hoisted on the DC transmission line insulator string. The insulator closed fixture 2 is installed on the insulator front clamping steel cap 4, and the insulator steel cap 4 connected as one.

As shown in Figure 2-3, the connecting plate includes a triangular connecting plate 5 and a right-angle hanging plate 6 that is rotatably connected to the triangular plate, wherein: the model of the triangular connecting plate is L-110J-300/1000, and the The model is the fitting Z-55150, the triangular connecting plate 5, the right-angle hanging plate 6, and the cross-arm side flap fixture 1 are connected by bolts 7, and the cross-arm side flap fixture 1 passes through the right-angle Hanging plate 6 is connected with the steel cap of the insulator.

Both the rated working load of the cross-arm side flap fixture 1 and the closed insulator fixture 2 are 150kN, the test load is 225KN, and the safety factor is 2.5. The above-mentioned technical parameters have greatly improved the safe operation performance of the insulator replacement tool for the cross-arm side-turning clamp and the insulator closed clamp, and are currently ranked first in the same kind of live working tools in my country. During operation, safe operation shall be carried out in strict accordance with DL5009.2 electric power construction safety work regulations.

The cross-arm side flap clamp 1 forms an anchor point on the connecting plate through the bolt, and the insulator steel cap is the anchor point of the insulator end. After tightening the hydraulic screw, the horizontal load of the insulator is transferred to the cross-arm side flap clamp 1. At this time, it is convenient to remove and replace the single-piece insulator. After the removal and replacement are defective, loosen the hydraulic screw, and the horizontal load is transferred again to the insulator for easy tool removal,

The cross-arm side flap clamp 1 and the insulator closed clamp 2 are made of titanium alloy. The type of titanium alloy material used is TC4. The use of this type of titanium alloy material not only reduces the volume of the tool itself, but also improves the mechanical strength of the tool, reduces the weight of the tool, reduces the operation risk, and improves the safety of the work.

As shown in Figure 4, a method for replacing 550kN class six-connected tension insulators of ±1100 kV UHVDC transmission lines includes the following steps:

Step 1: Assemble the replacement tool for 550kN class six-connected tension insulators;

Step 2: Tighten the hydraulic lead screw to lift the wire to a certain height, and loosen the insulator string. At this time, the horizontal load of the insulator is transferred to the cross-arm side flap fixture;

Step 3: Remove the spring pin in the lower nut of the insulator with a pin removal clip, and replace the defective insulator in the insulator string;

Step 4: After replacing the defective insulator, loosen the hydraulic screw to transfer the horizontal load on the side flap fixture of the cross-arm to the insulator. At this time, the side of the side flap fixture of the cross-arm is not stressed. Facilitate the dismantling operation of changing tools;

Step 5: Remove the replacement tool for the 550kN class six-connected tension insulator, where the removal step is opposite to the assembly step.

Assembling the replacement tool for 550kN class six-connected tension insulators in step 1 includes the following four steps:

A. Trial install the insulator closed fixture and hydraulic screw on the ground, and make sure it is correct;

B. Hoist the insulator closed fixture on the insulator string of the direct current transmission line through the pulley rope auxiliary tool;

C. Remove the bolts on the lower part of the cross-arm end flap fixture, install the cross-arm end flap fixture on the right-angle hanging plate and the triangular joint plate, install the bolts so that the cross-arm end flap fixture and The joint plate is connected as one;

D. Open the upper cover of the insulator, install the closed clamp of the insulator on the steel cap of the insulator, and close the upper cover of the insulator to connect the closed clamp of the insulator with the steel cap of the insulator.

Finally, it is noted that the above embodiments are only used to illustrate the technical solution of the present invention without limitation, other modifications or equivalent replacements made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and spirit of the technical solution of the present invention All should be included in the scope of the claims of the present invention.

Claims (8)

1. A replacement tool for 550kN-class six-connection tension insulators of ±1100 kV UHV DC transmission line, characterized in that it includes a cross-arm side-turn plate fixture, connecting plate, insulator closed fixture and two eight-ton hydraulic wires The cross-arm side flap fixture is installed on the connecting plate, and the cross-arm side flap fixture is connected to both ends of the insulator closed fixture through the two hydraulic screw screws. The other side of the insulator closed fixture is hoisted on the DC transmission line insulator string, and the insulator closed fixture is installed on the front clamping steel cap of the insulator and connected with the insulator steel cap as a whole. 2. A replacement tool for 550kN class six-connection tensile insulators of ±1100 kV UHVDC transmission line according to claim 1, characterized in that: the connecting plate includes a triangular connecting plate and a right-angle hanging plate that is rotatably connected to the triangular plate , the triangular plate, the right-angle hanging plate, and the cross-arm side flap fixture are connected by bolts, and the cross-arm side flap fixture is connected to the insulator steel cap through the right-angle hanging plate. 3. A replacement tool for 550kN class six-connected tension insulators of ±1100 kV UHVDC transmission line according to claim 1, characterized in that: the cross-arm side flap fixture and the insulator closed fixture The rated working load is 150kN, the test load is 225KN, and the safety factor is 2.5. 4. A replacement tool for 550kN class six-connected tension insulators of ±1100 kV UHVDC transmission line according to claim 2, characterized in that: the cross-arm side flap clamp is connected to the connecting member through the bolt. An anchor point is formed on the plate, and the insulator steel cap is the anchor point of the insulator end. 5. A replacement tool for 550kN class six-connected tension insulators of ±1100 kV UHVDC transmission line according to claim 1, characterized in that: the material of the cross-arm side flap clamp and the insulator closed clamp are both For titanium alloy material. 6. The tool for replacing 550kN class six-connected tension insulators of ±1100 kV UHVDC transmission lines according to claim 1, wherein a spring pin is arranged inside the insulator nut. 7. A method for replacing 550kN class six-connected tension insulators of ±1100 kV UHVDC transmission lines, characterized in that it comprises the following steps: Step 1: Assemble the replacement tool for 550kN class six-connected tension insulators; Step 2: Tighten the hydraulic screw to raise the wire to a certain height, and loosen the insulator string; Step 3: Use a pin removal clip to remove the spring pin in the lower nut of the insulator, and replace the defective insulator; Step 4: After replacing the defective insulator, loosen the hydraulic screw to transfer the horizontal load on the cross-arm side flap fixture to the insulator; Step 5: Remove the replacement tool for 550kN class six-gang tension insulators. 8. A method for replacing 550kN class six-unit tension insulators of ±1100 kV UHVDC transmission lines according to claim 7, characterized in that: the assembly of the 550kN class six-unit tension insulator replacement tool in the step 1 includes the following Four steps: A. Trial install the insulator closed fixture and hydraulic screw on the ground, and make sure it is correct; B. Hoist the insulator closed fixture on the insulator string of the direct current transmission line through the pulley rope auxiliary tool; C. Remove the bolts on the lower part of the cross-arm end flap fixture, install the cross-arm end flap fixture on the right-angle hanging plate and the triangular joint plate, install the bolts so that the cross-arm end flap fixture and The joint plate is connected as one; D. Open the upper cover of the insulator, install the closed clamp of the insulator on the steel cap of the insulator, and close the upper cover of the insulator to connect the closed clamp of the insulator with the steel cap of the insulator.