JP2643397B2 - Extension method of overhead transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention continuously and highly accurately monitors changes in wire sag in the extension of overhead power transmission lines extending in multiple spans at once. Further, the present invention relates to a method for extending an overhead transmission line, which enables the extension while always automatically controlling to the optimum sag.

[Prior Art] In the case where overhead power transmission lines are to be extended in a large number of spans, the third
As shown in the figure, the pulleys 13 and 13 are suspended from the steel towers 9 and 9 on which the overhead wire is wired, and the drum 8 and the extension wire 1 and the tension meter around which the electric wire 7 is wound around the drum site, and the overhead wire winch 10 and the And a winder 11 for winding the pull wire 7a.

First, a pull wire 7a is stretched on the wheel & train 13 of each tower, the end of the wire 7 is connected to the end of the wire 7a via a wire drawer 7b, and braking is given by the wire draw wheel 1. While pulling wire 7a is taken up by overhead wire winch 10, pulling wire 7a on wheel wheels 13, 13 of each tower is replaced with electric wire 7.

In the above-mentioned wire drawing work, if the wire drawing tension of the electric wire 7 is too large, the electric wire will be over-tensioned, causing rotation of the wire and the resulting laughing of the wires, and damage to the tower tower arm and the wire drawing car. However, an abnormal burden is imposed on the overhead vehicle, which is dangerous. On the other hand, if the wire tension is too small, the electric wire 7 may hang down and come into contact with the ground, possibly damaging the surface of the electric wire 7. In particular, when an important foreign object such as a house H as shown in FIG. 3 exists immediately below the extension line, the electric wire 7 comes into contact with the house H from a short notice and damages the house H. It cannot be said that there is nothing to give. In order to prevent such a situation from occurring, extension work is being carried out while maintaining close contact with each other between the drum site and the engine site. The distance between the engine and the engine place is usually several km away, and the state of the electric wire during the extension is not always visible, and depending on the terrain, the intermediate extension may not be visible at all. Things can often happen.

In [0008] the above-described critical lateral over objects passing period is conventionally allowed to monitor the wire ground clearance h deployed special dedicated wardens M ₂ as shown in FIG. 3, had carried out an extended line while keep in touch by the transceiver between the drum field worker M ₁ and the engine field worker M _3. However, lifeguards M ₂ under adverse environment such as mountainous areas it takes a considerable amount of time to arrive at the site, during which time can not be avoided is that prolonged that much man-hours are forced to work waiting.

Furthermore, to say that stay in touch with wardens M _2, differences of nuance in the contact between human beings, obscured by misunderstanding of pronunciation, delay time for the re-confirmation by it, operation mistakes on that panic, procedure It is not an exaggeration to say that there is always a risk of a dangerous accident such as a mistake.

The present invention has been made in view of the above-described circumstances, and has eliminated the need for placing a guard in the wire drawing section, and has included a wire drawing sag, particularly a span where an important crossover exists. An object of the present invention is to provide a wire drawing method capable of performing wire drawing with high reliability while automatically controlling the sag to always be the optimum sag.

[Means for Solving the Problems] In the so-called tension wire drawing method, the present invention uses a pulling wheel with a variable braking device as a pulling wheel, and connects the ground and the electric wire at an important position below the overhead line at a location close to the pulling wheel. A separation detection sensor for detecting a separation distance between the sensors is installed, and the detection signal of the separation detection sensor is used to adjust the braking of the variable braking device of the extension vehicle so that the sag of the electric wire is kept constant, while the extension of the extension line is separately provided. Another separation detection sensor that detects the separation distance between the electric wire and the ground is placed below the line between the important spans where important objects such as buildings, roads, electric wires, and railways exist, and the separation detection sensor Is applied to control the weight of the braking of the extension line car or the take-up speed of the overhead wire winch based on the detection signal of the above, thereby extending the line while preventing the electric wire from dropping abnormally in the important span.

[Effect] When the length of a single wire drawing is increased as in the case of collective wire drawing of a large number of diameters, the wire drawing sag that can be adjusted by braking the wire drawing vehicle is the average sag between all the diameters. Looking at the spans, some spans are abnormally stretched, and some spans are abnormally reduced in sag, and the whole is in a mixed state of these.

It is very dangerous if the hanging span of the wire is an important transverse span.

According to the present invention, although the overall line sag is made constant by braking control of the rolling-stock vehicle, the detection result is prolonged by providing a sensor for detecting the sag particularly in the important span. By inputting the information to the braking control system of the railway car or the winding control system of the overhead wire winch, it is possible to promptly respond to the occurrence of an abnormality in an important span and to appropriately prevent the occurrence of an accident.

[Examples] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic explanatory view showing a configuration example of a control system for implementing a wire drawing method according to the present invention, and the same reference numerals as those in FIG. 3 indicate the same configurations.

In the present invention, an extended wheel with a variable braking device 1a is used as the extended wheel 1. The variable braking device 1a mentioned here includes not only mechanical braking such as a hydraulic brake but also electric braking using a variable speed motor such as a DC motor.Especially, from the viewpoint of quick response, the electric braking is performed. Is preferred.

Spacing detection sensor for detecting a distance L ₁ of the ground and the electric wire sag of the wire 7 to measurable located precisely at the critical position, that is extended line of span connection is easy on the extension line vehicle 1 2
Is installed.

The detection signal of the sensor 2 is input to the comparator 4 together with the reference signal output from the reference setting device 5 in which the appropriate sag of the wire at the time of extension is set in advance, and the signal calculated and output to the controller 3. Then, the braking of the variable braking device 1a is adjusted.
In this operation, if the take-up speed of the take-up winch 10 is held constant, the electric wire 7 is added the braking when the detection distance L ₁ of the sensor 2 exceeds the reference value of the reference setting device 5 is lifted, it Is less than the reference value, the braking is loosened, the wire 7 is increased in its sag by its own weight, and is automatically controlled so that the wire drawing always proceeds with the wire sag near the reference value.

However, the above is the case of wire drawing in an ideal state, and even if the above control is performed, in reality, as described above, in a state where all the wires maintain the preset reference sag in each span as described above. It is not always extended. Even if the reference sag is secured between the installation diameters of the sensor 2, if the number of steel towers is increased and the extension section becomes very long, some disturbance (wind pressure, wire wheel passage at the wire connection part, winding For various reasons such as a change in the speed of the take-winch), the running of the electric wire occurs, and a span occurs in which the sag is abnormally increased. On the other hand, a phenomenon in which the electric wire rises in the adjacent span may occur.

If such a run occurs in a span where there is an important transversal object 12 such as a building or a road or an electric wire or a railway below, the electric wire comes into contact with them and is very dangerous.

In the present invention, such a set up another separation sensor 2A to existing span significant lateral over object 12, and configured to be able to detect the distance L _2, the detection signal sensor 2A detects Is input to the lower limit setting device 6.

The lower limit setter 6 is set with a lower limit value at which the electric wire is allowed to fall. In a state where the electric wire 7 during the extension does not drop to this lower limit value, the above-described sensor 2 controls the braking of the extension wire car. It is left to control of the wire drawing sag.

When the detection distance L ₂ of the sensor 2A is lowered beyond the lower limit value, the signal is weighted input to the comparator 4 from the lower limit setter 6, the amount set by apparent on reference setter 5 It is added, by increasing the tension of the wire 7 by the addition amount, by increasing the wire distance L ₁ and L ₂ to avoid the occurrence of the abnormal state.

By this operation, the abnormality of the sag of the drawn wire gradually recovers, returns to the steady state, and becomes stable, and the wire separation distance L ₂ between the important lateral excess diameters
Is larger than the lower limit value set by the lower limiter 6, the input signal from the lower limiter 6 to the comparator 4 is automatically cut off, and the steady state of the wire drawing sag by the sensor 2 and the reference setter 5 is returned again. Return to control.

FIG. 2 is a schematic explanatory view showing another embodiment of the wire drawing method according to the present invention.

In the present embodiment, the same separate spaced sensor 2A installed in span in the presence of significant lateral over object 12, and configured to be able to detect the distance L _2, the detection signal sensor 2A detects Is input to the lower limit setting device 6, but the signal is input to the take-up speed control system of the take-up winch 10 instead of the braking control of the line drawing vehicle.

When the detection distance L ₂ of the sensor 2A is lowered beyond the lower limit, a separate comparator 4A from the lower limit setter 6 the signal
The take-up speed of the take-up winch 10 is increased by a separate controller 3A from the take-up speed initially set by the reference setter 5A. The electric wire 7 is pulled up by the increase in the take-up speed, and the occurrence of an abnormal state is avoided.

With this operation, the abnormality of the sagging of the drawn wire gradually recovers, and returns to a steady state and becomes stable. Then, the take-up speed of the winding winch 10 is returned to the constant speed set by the reference setting device 5A.

In the above description, the reference setting device and the lower limit setting device are used. However, the lower limit condition may be incorporated into the output of the sensor itself, and the signal may be directly input to the controller. Needless to say, this is possible.

[Effects of the Invention] As described above, according to the wire drawing method according to the present invention,
The following excellent effects can be exhibited when the wire is collectively extended between a number of steel towers.

(1) Since the wire drawing sag is automatically corrected and controlled, the wire drawing speed is stable and high-speed operation can be performed.

(2) Since it is possible to reduce the number of full-time supervisors and workers who respond to them in all places, there is a great effect of saving labor and accompanying costs.

(3) Since there is no need for communication by a person, there is no time delay for erroneous recognition or reconfirmation, and it is possible to eliminate an accident caused by a human erroneous operation.

(4) It is possible to reliably avoid occurrence of an abnormality in a span where an important lateral object exists.

[Brief description of the drawings]

1 and 2 are explanatory views showing two embodiments according to the present invention, and FIG. 3 is an explanatory view showing a conventional tension drawing state. 1: Rolling line, 1a: Variable braking system, 2,2A: Distance detection sensor, 3,3A: Controller, 4,4A: Comparator, 5,5A: Reference setting device, 6: Lower limit setting device, 7: Electric wire, 9: steel tower, 10: take-up winch, 12: important luggage, 13: gold wheel.

Claims (2)

(57) [Claims] In a tension drawing method in which a pulling wire is drawn by an overhead winch while a braking force is applied by a drawing wire, and the electric wire is collectively drawn between a number of steel towers, a drawing wire with a variable braking device is used as the drawing wire. A distance detection sensor that detects the distance between the ground and the electric wire is installed at an important position below the overhead wire that is easy to connect to the line vehicle, and the variable braking of the line vehicle is detected based on the detection signal of the distance detection sensor. While controlling the braking of the device to keep the sag of the electric wire constant, the electric wire is also placed under the critical span where there is an important crossover such as a building, road or electric wire or railway below the extended line. A separate distance detection sensor for detecting the distance between the vehicle and the ground is arranged, and a detection signal of the another distance detection sensor is configured to be able to be weighted and input to the braking control system of the line drawing vehicle. Weighting control of
A method for extending an overhead transmission line, which extends while preventing abnormal sagging of the electric wire between the important spans. 2. A tension drawing method in which a pulling wire is drawn by an overhead winch while a braking force is applied by a drawing wheel, and the electric wire is collectively drawn between a plurality of steel towers. A distance detection sensor that detects the distance between the ground and the electric wire is installed at an important position below the overhead wire that is easy to connect to the line vehicle, and the variable braking of the line vehicle is detected based on the detection signal of the distance detection sensor. While controlling the braking of the device to keep the sag of the electric wire constant, the electric wire is also placed under the critical span where there is an important crossover such as a building, road or electric wire or railway below the extended line. And another separation detection sensor for detecting the separation distance between the ground and the ground, and controlling the take-up speed of the overhead wire winch based on the detection signal of the other separation detection sensor, different from the braking control of the line rolling vehicle. Electric wire between the critical spans by the control system Extending line method of overhead transmission lines Nobesen while preventing the occurrence of abnormal sag.