JPH05319151A - Constitution of long feeder - Google Patents

Abstract

PURPOSE:To prevent breakage of a support insulator and constitute a feeder of optional length without providing an expansion joint by absorbing strength and expansion of the feeder by folding change of the feeder. CONSTITUTION:A feeder 1 is installed folded at primary amplitude a0 within a nutation surface between support insulators 2 and displacement of the nutation surface with which a collector ring makes contact is constituted to be smooth, and the feeder 1 is fixed so as not to nutate with the support insulator 2. When temperature rises and the feeder 1 extends, amplitude (a) increases, and when temperature drops, the amplitude (a) decreases, and temperature expansion is absorbed. Consequently, it is possible to reduce force to work on the support insulator 2 without damaging smoothness of the nutation surface, and accordingly, it is possible to design length of the feeder longer freely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a power supply line for supplying electric power to electric vehicles of railways, monorails and new transportation systems.

[0002]

2. Description of the Related Art In subways, monorails, and new transportation systems, a third rail or a rigid train line is used as a power supply line for supplying electric power to electric vehicles, instead of a catenary overhead line. Since such a rigid feed line can increase the wear cross-sectional area and reduce the maintenance amount, it is mainly used for low-speed transportation.

However, in the conventional power supply line shown in FIG. 3, since the power supply line between the support insulators is straight, if the power supply line is fixed at the insulator position in order to suppress temperature expansion and contraction, the internal stress of the power supply line becomes excessive. Therefore, there is a risk that the supporting insulator will be damaged. Therefore, in installing the power supply line and the support insulator, the power supply line and the support insulator are slidably supported with respect to each other, and the temperature expansion and contraction of the power supply line are not suppressed. In order to allow this temperature expansion and contraction, the power supply line is divided into certain lengths, and expansion joints are provided so that the ends can expand and contract. Since the expansion joint is composed of two feeders that move relative to each other, a step is likely to occur on the sliding surface. Therefore, there has been a drawback that the current collector jumps near the expansion joint, resulting in large disconnection and local wear of the feeder line.

In particular, when the rigid power feeding line is applied to a high-speed railway, the impact of the current collector on the expansion joint is large, and there are many problems in terms of strength.

In the field of tracks, long rails having a length of several kilometers have already been laid, and expansion joints are provided at both ends of the long rails so that the rails can be expanded and contracted. However, when applying this idea to the power supply line as it is, the strength of the insulating support such as the insulator becomes a problem, and it has been about 2
It is common to provide expansion joints for every length of about 00 m.

[0006]

The problem to be solved is that in a generally used linear power supply line, when expansion and contraction due to temperature change is suppressed, a very large force acts on the insulating support. The point at which the insulating support is destroyed. Further, another object of the present invention is to eliminate a large separation line, a local abrasion of a power supply line, and an impact of a current collector, which are caused by a step on a sliding surface near the expansion joint.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention folds a feeder line in its current collecting surface in order to reduce the force acting on an insulating support due to the temperature expansion and contraction of the feeder line. The most main feature is that the expansion joint is not required because the power supply line can be expanded and contracted with temperature. By this method, it was possible to construct a feeder line of arbitrary length using a conventionally used insulating support without impairing the smoothness of the current collecting surface.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, in which the equipment is installed above a tunnel such as a subway.
Here, 1 is a fold feeder and 2 is a support insulator.

The power supply line is bent and installed in the sliding surface between the supporting insulators, and the displacement of the sliding surface in contact with the current collector is made smooth. The folding power supply line 1 is fixed and attached so as not to slide with the support insulator 2.

The fold feed line 1 folds with an initial amplitude a ₀ within the sliding surface, and its temperature expansion and contraction is mainly absorbed by the change in its amplitude a. When the temperature rises and the power supply line extends, a increases, and when the temperature lowers and the power supply line shrinks, a decreases. As a result, by providing the power supply line with an appropriate initial amplitude folding displacement,
The force that accompanies the thermal expansion and contraction that acts on the support insulator can be dramatically reduced.

As an example showing the above effect, the supporting insulator 2 is assumed on the assumption of the constant power supply line and temperature change shown in Table 1 below.
When the initial displacement dependency of the force acting on the support is calculated, it is compared with the force acting on the support insulator 2 in the case of the straight feeder line 3 as shown in FIG.
It becomes smaller at the rate shown in. I.e. ± 50 m in this example
If an initial displacement of about m 3 is set, it is possible to make it about 5% or less of the force that acts on the support insulator 2 in the case of the straight feeder line 3.

[0012]

[Table 1]

In the calculation for calculating FIG. 2, the compressive force is based on the assumption that buckling occurs. In addition, the vertical axis β in FIG. 2 is the ratio to the force acting on the support insulator 2 in the case of the linear power supply line 3, and the horizontal axis initial amplitude a ₀ is the initial displacement amplitude of the folded power supply line 1.

As described above, by adopting the feed line that folds in the sliding surface, the force acting on the supporting insulator can be remarkably reduced without impairing the smoothness of the sliding surface. Therefore, temperature expansion and contraction of the power supply line can be suppressed within the strength of the support insulator, and it becomes easy to design the length of the power supply line arbitrarily. That is, it is possible to configure a long power supply line without an expansion joint.

[0015]

As described above, according to the method of constructing the power supply line of the present invention, since the temperature expansion and contraction of the power supply line is absorbed by the bending displacement of the power supply line, the force acting on the support insulator can be reduced, so that the expansion joint can be installed. There is an advantage that a feeder line of an arbitrary length can be configured without providing it. Further, since the expansion and contraction can be suppressed even at both ends of the power supply line, the facility is simple and the support insulator can be prevented from being damaged. As a result, large disconnection near the expansion joint, local wear of the power supply line, and impact of current collection are eliminated, and high-speed performance can be improved, and at the same time the amount of maintenance can be dramatically reduced. INDUSTRIAL APPLICABILITY The present invention can be applied to applications such as the third rail and rigid overhead wire.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a long power supply line using a fold power supply line.

FIG. 2 is an example of a diagram showing a rate of reduction in a supporting insulator acting force due to temperature expansion and contraction of a folding power supply line, as compared with a conventional linear power supply line.

FIG. 3 is an explanatory diagram of a power supply line using a conventional linear power supply line.

[Explanation of symbols]

 1 Folded power supply line 2 Support insulator 3 Linear power supply line

Claims (1)

[Claims] 1. A power supply line for supplying electric power to an electric vehicle of a railway, a monorail, or a new transportation system, the temperature expansion and contraction of the power supply line between supporting insulators is set by folding the power supply line within its current collecting surface. A method of constructing a long power supply line that absorbs the energy by doing so and enables one continuous power supply line to be installed at an arbitrary length.