CN103812053B - Be exclusively used in the repair method to electrical lead degree of speeding - Google Patents

Abstract

The invention discloses a method for overhauling the tension of electric wires. One end of the hand hoist is fixed on the cross arm, the other end is connected to the wire through an aluminum alloy clamp, and the hand hoist is tightened to remove the elbow hanger. The pins at the plate and the tension clamps and the tension clamps are used to tighten or loosen the lever block to transfer the calculated slack value f of the conductor to the lever block for adjustment; the conductors on the straight rods on both sides are suspended point, measure the distance equal to the sag value vertically downwards, tie a slack plate on each, aim at the sag plate on the opposite pole from the sag plate on one pole, and adjust the wire tension. The sag at that time is the required sag. This maintenance method obtains accurate values by adopting strict measurement and formula calculation, which can adjust the power line to the best state, and solves the problem that the existing power line slack adjustment is adjusted by the maintenance personnel according to experience. question.

Description

A method for overhauling the slack of power conductors

technical field

The invention relates to a maintenance method, in particular to a maintenance method dedicated to the slack of electric power conductors, which belongs to the field of electric power maintenance.

Background technique

Electricity is an energy source powered by electrical energy. Invented in the 1870s, the invention and application of electricity set off the second industrialization climax. It has become one of the three scientific and technological revolutions in the world since the 18th century in human history. Since then, technology has changed people's lives. Even in today's Internet age we still have a growing demand for electricity, as we have invented more products that use electricity, such as computers and home appliances. It is undeniable that the continuous emergence of new technologies has made electricity a necessity for people. The large-scale power system that appeared in the 20th century is one of the most important achievements in the history of human engineering science. It is a power production and consumption system composed of power generation, power transmission, power transformation, power distribution and power consumption. Today is the age of the Internet, and we still have a growing demand for electricity because we have invented more products that use electricity, such as computers and home appliances. The power transmission is transmitted through the power line, and the power line is exposed to the external environment. Due to the effect of the natural environment, the gravity of the power line and other factors, the power line is prone to looseness or tension after a period of use. The situation is easy to affect the service life of the power line. In the past, people adjusted it through the maintenance personnel based on experience. This has a large error, which often results in improper adjustment, and the service life of the power line cannot be guaranteed, which affects power transmission. efficiency and cause economic loss.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned problem that the adjustment of the slack of the existing electric power line is made by the maintenance personnel according to the experience adjustment, and a large error occurs. Accurate values can be obtained through accurate measurement and formula calculation, and the power line can be adjusted to the best state, which solves the problem that the existing power line slack adjustment is adjusted by the maintenance personnel according to experience, and there is a large error.

The purpose of the present invention is achieved through the following technical solutions: a method for overhauling the slack of the power conductors, comprising the following steps:

(a) Calculate the laxity value f by the following formula,

f——sag value at temperature t (m);

f1——the relaxation value corresponding to t1 (m);

f2——sag value corresponding to t2 (m);

t - the measured actual temperature (°C);

t1——a larger temperature value adjacent to the actual temperature (°C);

t2——a smaller temperature value adjacent to the actual temperature (°C);

(b) Fix one end of the hand hoist on the cross arm, and connect the other end to the wire through the aluminum alloy clamp, tighten the hand hoist and remove the pins and tension clamps at the elbow hanging plate and the tension clamp , use the tightening or loosening of the lever block to transfer the calculated slack value f of the wire to the lever block for adjustment;

(c) At the wire suspension points of the straight poles on both sides, measure the distance equal to the sag value vertically downward, and tie a sag board to each, and observe the sag from the pole on one side by the observer. Aim at the slack plate on the pole on the opposite side, adjust the tension of the wire so that the wire is just cut on the aiming line, and the sag at this time is the required sag;

(d) Maintenance personnel use the slack plate to observe that the slack of the conductor meets the requirements and the three-phase slack is consistent. After passing the test, re-select the position to fix the strain clamp and connect it to the elbow hanging plate.

When adjusting, it is necessary to untie all the binding wires of the porcelain bottle in the tension section to facilitate adjustment. The slack of the wire is directly related to the tension of the wire and the insulation distance to the ground. Generally, the sag observation file is selected in the flat area with small height difference in the tension section. When there are 6 levels in the tension section, you can choose the first level to observe the sag in the middle; Observe the sag in one file, that is, select one file at both ends and the middle of the tensile section to observe the sag.

Observe the sag of the conductor, usually in conjunction with the tightening work, and make the sag of the installed conductor conform to the design sag through observation. The error of wire sag should not exceed ±5% of the design sag. After the wires are tightened, the sag of the wires of each phase in the same gear should be consistent, and the sag difference of the wires arranged horizontally should not be greater than 50mm. When erecting wires with different cross-sections on the same cross arm, the wire with the largest vertical arc should be the main wire.

Through the above method, the specific value of the slack of the wire can be accurately obtained, and the maintenance personnel can control the wire to adjust according to the obtained specific value, which overcomes the traditional maintenance method that only relies on the experience of the maintenance personnel to judge, the error is large, and rework often occurs The phenomenon.

To sum up, the beneficial effects of the present invention are: the overhaul method obtains accurate values by adopting strict measurement and formula calculation, and can adjust the power line to the best state, which solves the problem of the existing power line slack adjustment. It is the problem that the error is very large after the maintenance personnel adjust according to experience.

detailed description

The present invention will be further described in detail below in conjunction with the examples, but the embodiments of the present invention are not limited thereto.

Example 1:

It is specially used for the maintenance method of the slack of the power conductor. The ambient temperature at that time is measured in advance as 20°C, and t1 is set as 25°C, and t2 is set as 15°C. It is obtained by looking up the table that f1 is 8m, and f2 is 4m. Use the formula

It is calculated that f is 6m. Fix one end of the lever hoist on the cross arm, and connect the other end to the wire through an aluminum alloy clamp. Tighten the hand hoist to remove the pins and Tension-resistant wire clamp, use the tightening of the lever block to transfer the calculated slack value of the wire 6m to the lever block for adjustment;

At the wire suspension points of the straight rods on both sides, measure the distance equal to the sag value vertically downwards, and tie a sag board to each. The sag plate on the side pole adjusts the tension of the wire so that the wire is just cut on the aiming line, and the sag at this time is the required sag;

Maintenance personnel use the slack plate to observe that the slack of the conductor meets the requirements and is consistent with the three-phase slack. After passing the test, re-select the position to fix the tension clamp and connect it to the elbow hanging plate.

Using the above method, adjust the slack of the power wire to a suitable slack, the value is accurate, the power line can maximize the transmission efficiency, and ensure its service life, and solve the problem that the slack adjustment of the existing power line is all based on the experience of maintenance personnel There is a big error in the adjustment.

Example 2:

It is specially used for the maintenance method of the slack of the power conductor. The ambient temperature at that time is measured in advance as 12°C, and the t1 is set to 15°C, and the t2 is set to 6°C. It is obtained by looking up the table that f1 is 4m, and f2 is 1.8m. Use the formula

It is calculated that f is 2.9m. Fix one end of the lever hoist on the cross arm, and connect the other end to the wire through an aluminum alloy clamp. Tighten the hand hoist to remove the pins at the elbow hanging plate and the tension clamp. and tension clamp, use the tightening of the lever block to transfer the calculated slack value of the wire 2.9m to the lever block for adjustment;

At the wire suspension points of the straight rods on both sides, measure the distance equal to the sag value vertically downwards, and tie a sag board to each. The sag plate on the side pole adjusts the tension of the wire so that the wire is just cut on the aiming line, and the sag at this time is the required sag;

Maintenance personnel use the slack plate to observe that the slack of the conductor meets the requirements and is consistent with the three-phase slack. After passing the test, re-select the position to fix the tension clamp and connect it to the elbow hanging plate.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form. Any simple modification or equivalent change made to the above embodiments in essence according to the technology and method of the present invention shall fall within the scope of the present invention. within the protection scope of the present invention.

Claims (1)

1. The method for overhauling the slack of the power conductors is characterized in that it comprises the following steps: (a) Calculate the laxity value f by the following formula, f——sag value at temperature t (m); f1——the relaxation value corresponding to t1 (m); f2——sag value corresponding to t2 (m); t - the measured actual temperature (°C); t1——a larger temperature value adjacent to the actual temperature (°C); t2——a smaller temperature value adjacent to the actual temperature (°C); (b) Fix one end of the hand hoist on the cross arm, and connect the other end to the wire through the aluminum alloy clamp, tighten the hand hoist and remove the pins and tension clamps at the elbow hanging plate and the tension clamp , use the tightening or loosening of the lever block to transfer the calculated slack value f of the wire to the lever block for adjustment; (c) At the wire suspension points of the straight poles on both sides, measure the distance equal to the sag value vertically downward, and tie a sag board to each, and observe the sag from the pole on one side by the observer. Aim at the slack plate on the pole on the opposite side, adjust the tension of the wire so that the wire is just cut on the aiming line, and the sag at this time is the required sag; (d) Maintenance personnel use the slack plate to observe that the slack of the conductor meets the requirements and the three-phase slack is consistent. After passing the test, re-select the position to fix the strain clamp and connect it to the elbow hanging plate.