CN104505766B - The instrument and method of a kind of charged for replacement transformer station 500kV strain insulator strings - Google Patents

Abstract

The present invention relates to a tool and method for live replacement of 500kV strain insulator strings in a substation. The tool includes a connecting plate clamp, an insulator upper clamp, a single-headed screw rod, an insulating pulley, and an insulating pull rod; the connecting plate clamp is fixed on the insulator The side connecting plate of the string wire, the upper clamp of the insulator is fixed on the second insulator of the insulator string to be replaced, the single-headed screw rod connects the connecting clamp and the two sides of the upper clamp of the insulator, and the insulating pulley is located on the connecting clamp Above, the insulating pull rod is connected to the connecting plate fixture and the structure, and the insulating pull rod is fixed to the structure through a hoop. The present invention provides a tool and method for replacing 500kV strain insulator strings in substations with live electricity. When replacing insulators with live electricity, the bottle holder is not used, and the insulator strings are replaced by the micro-overdrawing method, so that the working overdrawn length is changed from the original 150- 200mm is reduced to about 15mm, which greatly reduces the over-drawing of the tightening operation, thus greatly reducing the stress of the conductor construction during tightening, and improving the safety of the operation.

Description

A tool and method for live replacement of 500kV tension insulator strings in substations

technical field

The invention relates to a tool and a method for replacing an insulator string, in particular to a tool and a method for replacing a 500kV tension insulator string in a substation with electricity.

Background technique

With the construction and development of the 500kV ultra-high voltage power transmission and transformation system, the 500kV power grid has become the link and artery of the national networking, and it is also the main skeleton of the regional power grid, which plays a pivotal role in the safe and stable operation of the entire power grid. The 500kV substation is also the connection dominance point of the 500kV system. From the perspective of the safe operation requirements of the power grid and the structural form of the power grid, live work in the substation is necessary and frequent, and the replacement of the strain insulator string is a regular work. According to the current situation of live work in substations, 500kV tension insulators are heavy, each string weighs 300kg, the length is about 5m, and the tension of the wires is about 3-5t. Insulator strings are very difficult. The traditional method is to use the bottle holder, the traction length is 150-200mm by the over-traction method, the construction stress is very large when the line is tightened, the structure of the bottle holder with the horizontal force and the vertical force is very dangerous, and the whole set of tools More bulky and inconvenient to install.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned prior art and provide a tool and method for live replacement of 500kV tension insulator strings in substations, so as to solve the difficult problem of live operation for replacing 500kV tension insulator strings in substations.

The technical solution adopted to realize the purpose of the present invention is a tool for replacing 500kV strain insulator strings in substations with electricity. The tool is fixed on the side connecting plate of the insulator string wire, the upper clamp of the insulator is fixed on the second insulator of the insulator string to be replaced, the single-headed screw rod is set on both sides of the clamping fixture and the upper clamp of the insulator, and the insulating pulley is set on the connecting plate On the clamp; one end of the insulating tie rod is fixed on the structure through a hoop, and the other end is connected to the connecting plate clamp.

In addition, the present invention also provides a method for replacing an insulator string using the tool, the method includes the following steps:

S100. Installation clamps: the equipotential electrician hangs up the connecting plate clamps, insulating pull rods, single-headed screw rods, insulator clamps, and insulating pulley tools, and installs them at both ends of the insulator string to be replaced;

S200. Install the insulating block, and tie the insulating sling through the insulating block on the connecting plate clamp to the third insulator of the replacement insulator string;

S300. Tighten the single-ended screw to transfer the load of the first insulator of the insulator string to be replaced to the single-ended screw;

S400. Remove the connecting bolts connecting the first insulator bowl head hanging plate and the connecting plate of the insulator string to be replaced;

S500. Loosen the single-head screw to transfer the load of the insulator string to be replaced to the insulating pull rod;

S600, replace the insulator string;

S700. Loosen the single-head screw and remove the replacement tool.

Using the present invention does not use the bottle holder when replacing the insulator with electricity, and replaces the insulator string through the micro-over-drawing method, so that the over-drawing length of the operation is reduced from the original 150-200mm to about 15mm, and the over-drawing operation of tightening the line is greatly reduced. The amount, thus greatly reducing the conductor construction stress when tightening the line, improves the safety of the operation.

Description of drawings

Fig. 1 is a structural schematic diagram of a tool for live replacement of a 500kV tension insulator string in a substation according to the present invention.

Fig. 2 is an enlarged schematic diagram of the connecting end of the insulating tie rod and the structure.

Fig. 3 is an enlarged schematic diagram of the connecting end of the insulating pull rod and the connecting plate fixture.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Fig. 1, the tool of the present invention for live replacement of a 500kV strain insulator string in a substation includes a connecting plate clamp 1, an insulator upper clamp 3, a single-ended screw rod 4 (41, 42), an insulating pulley 11, and an insulating pull rod 2 (21 ,twenty two). The connecting plate fixture 1 is fixed on the side connecting plate of the insulator string conductor, the insulator upper clamp 3 is fixed on the second insulator of the insulator string 5 to be replaced, and the single-ended screw rod 4 (41, 42) is arranged on the connecting plate fixture 1 and On both sides of the clamp 3 on the insulator, the insulating pulley 11 is arranged on the connecting plate fixture 1, and the two ends of the insulating pull rod 2 (21, 22) are respectively connected to the connecting plate clamp 1 and the structure tower 6, wherein the insulating pull rod 2 (21, 22) One end of 22) is fixed on the construction tower 6 by hoops (211, 221).

The replacement of insulator strings by using the above-mentioned tools for live replacement of 500kV tension insulator strings in substations includes the following steps:

S100. Fixtures for installation: tools such as fixture 1 for the equipotential electrician to hang the connecting plate, insulating pull rod 2 (21, 22), single-head screw rod 4 (41, 42), insulator upper clamp 3, insulating pulley 11 and other tools. Replace the insulators at both ends of the string and install them.

S200 , install the insulating tackle 11 , and tie the insulating sling through the insulating tackle 11 on the connecting plate jig 1 to the third insulator of the replacement insulator string 5 .

S300. Tighten the single-ended screw mandrel 4 (41, 42) to transfer the load of the first insulator of the insulator string to be replaced to the single-ended screw mandrel 4 (41, 42).

S400. Remove the bolts connecting the first insulator bowl head hanging plate and the connecting plate of the insulator string to be replaced.

S500. Loosen the single-ended screw mandrel 4 (41, 42) to transfer the load of the insulator string to be replaced to the insulating pull rod (21, 22).

S600. Replace the insulator string 5.

S700. Loosen the single-head screw 4 (41, 42) and remove the replacement tool.

Claims (1)

1. a kind of instrument of use charged for replacement transformer station 500kV strain insulator strings carries out replacing insulator string method, described Instrument includes card, single head screw mandrel, insulation coaster, insulated tension pole on link plate clamping tool, insulator, and the link plate clamping tool is fixed on insulation Fixed on substring side of wire yoke plate, insulator due on second insulator of insulator chain to be replaced, single head screw mandrel is arranged on The both sides blocked on link plate clamping tool and insulator, insulation coaster is on link plate clamping tool；One end of insulated tension pole is fixed by anchor ear In on framework tower, the other end is connected with link plate clamping tool；

Comprise the following steps characterized in that, carrying out replacing insulator string method：

S100, installation fixture：Equipotential electrician hang on link plate clamping tool, insulated tension pole, single head screw mandrel, on insulator card, insulation slide Turner has, and is installed at insulator chain two ends to be replaced；

S200, insulation coaster is installed, insulated sling is tied up to the of replacing insulator chain through the insulation coaster on link plate clamping tool On three insulators；

S300, tighten up single head screw mandrel to shift the load of insulator chain first insulator to be replaced to single head screw mandrel；

S400, the connecting bolt for removing insulator chain first insulator socket-clevis eye to be replaced and yoke plate；

S500, relaxation single head screw mandrel are to shift the load of insulator chain to be replaced to insulated tension pole；

S600, replacing insulator chain；

S700, relaxation single head leading screw simultaneously remove replacing instrument.