JPH0478727A - Power conducting device for preventing freezing of trolley wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an energizing device that prevents frost, snow, and ice from forming on a contact wire, particularly when a long contact wire is used. This invention relates to an anti-icing energizing device suitable for main lines.

(Prior Art) When frost or water droplets adhere to the contact wire due to the temperature drop in winter, it may interfere with current collection by the pantograph of the vehicle, which may impede the operation of the vehicle.

As a means of preventing water droplets from adhering to the contact wire, there are methods such as periodically applying oil to the contact wire, or using a contact wire with a built-in heater wire, and heating the contact wire by energizing the heater wire. There are known ways to do this.

The method of applying oil requires labor to periodically apply the oil, and there are also problems in that the application roughens the contact wire surface and stains the car body due to oil dripping. However, this problem does not occur with the method of heating the heater wire built in the contact wire by energizing it. By applying an alternating voltage to both ends of the Hilter wire,
A method is known in which the heater wire can be energized even while the vehicle is running.

As shown in FIG. 4, this uses a contact wire 10 in which a heater wire 12 is insulated and built into a contact wire main body 11, and the contact wire main body 11 is supplied with a DC high voltage (for example, 1500V) is applied. One end 12b of the heater wire 12 is connected to the contact wire main body 11,
The other end 12a is connected to one terminal of the secondary winding of the isolation transformer 21 via a switch 23. The other terminal of the secondary winding of the isolation transformer 21 is connected to the contact wire main body 11 via a capacitor 22 and a switch 23. Isolation transformer 21
The primary winding of is connected to the distribution line 15. The above-mentioned AC current supply circuit is provided in necessary sections of the contact wire 10 to continuously prevent the contact wire from freezing. Here, the heater wire 12 is built into the contact wire main body 11, and the insulation between the contact wire main body 11 and the heater wire 12 has insulation performance corresponding to the maximum voltage generated in the secondary winding of the insulation transformer 21. It is considered a thing.

A DC high voltage is constantly applied to the contact wire main body 11 via the feeder wire 13, so that the electric train 30 can be operated at any time.

The operation of this anti-icing device will be explained below.

When the switch 23 is turned on, both ends 12 of the heater wire 12 are connected from the secondary winding of the insulating transformer 21 via the contact wire main body 11.
An alternating current voltage is applied to a and 12b. By applying this AC voltage, the heater wire 12 generates heat, and the contact wire main body 11
to prevent freezing.

At this time, the DC current of the contact wire main body 11 is
1 to prevent it from flowing into the distribution line 15. Similarly, the isolation transformer 21 also prevents DC voltage from being applied to the distribution line 15 .

(Problem to be solved by the invention) However, according to the conventional energizing device, there is no problem when it is used in a place where relatively short contact wires (less than about 500 m) are installed in parallel, such as in a depot. However, when carried out on the main line, the contact wire is stopped at intervals of about 800 to 1600 m and the construction is carried out in sections, so the unit length of the heater wire, that is, the length from 12a to 12b in Figure 4, is thick. (As a result, the electrical resistance of the heater wire increases, and the necessary amount of heat cannot be obtained.

To counter this, it is necessary to either increase the applied voltage or limit the increase in electrical resistance.

However, when the applied voltage is increased, the potential difference between the heater wire and the contact wire increases, and it is necessary to improve the insulation performance between the two. In addition, one way to limit the increase in electrical resistance is to increase the diameter of the heater wire, but increasing the diameter increases the weight of the entire contact wire, which requires changes to the attached fittings, contact wire structure, and supports. Renovation is required and the cost of refurbishment will be significant.

On the other hand, there is also a method of shortening the heater wire in the main line to limit the increase in electrical resistance, but in this method, the contact wire is shortened and each short contact wire is stopped and installed, or a double ear connection is used. The terminal of the heater wire will have to be taken out.Removing a short contact wire will require a large amount of repair costs, and if the terminal is removed with a double ear connection, the pantograph may become disconnected when the vehicle is running at high speed. There is a problem in that it causes this to occur.

The present invention has been made to solve the above-mentioned problems, and even in main lines where long trolley cotton is installed, the trolley wire does not have to be shortened, and it does not have to be built into the trolley wire. An object of the present invention is to provide an energizing device for preventing icing that does not require increasing the diameter of a heater wire or improving insulation performance.

(Means for Solving the Problems) In order to achieve the above object, the present invention uses a contact wire in which the heater wire is insulated from the contact wire main body and is built in, and a direct current high voltage is applied to the contact wire and the contact line. Separately from the power supply
An AC power source taken from the distribution line is placed at both ends of the contact wire. A closed loop is formed by the heater wire and the contact wire body including the AC power supplies at both ends, and the resulting series added voltage is applied to the heater wire.

When using the above-mentioned energizing device over a long section, multiple contact wires with built-in heater wires are arranged in succession, and a single AC power source is installed at the part where the ends of adjacent contact wires meet to power the heaters on both sides. Power the line. At this time, two AC power supplies adjacent on both sides are connected in series through the contact wire body, and electricity is applied to the heater wire between the two power supplies. In addition, a controller is provided that includes a sensor that detects the surface temperature of the contact wire and a switch that turns on and off the heater wire so that the surface temperature of the contact wire is 0° C. or higher. This controller is arranged at every other location of the AC power source so that it can control the energization of the heater wires on both sides.

(Function) In the energizing device configured as described above, even when a DC high voltage for vehicle running is applied to the contact wire main body, the energizing circuit including the contact wire main body and the built-in heater wire An alternating current is applied to the contact wire to heat it and prevent it from freezing.

At this time, the AC power supplies disposed at both ends of the contact wire are connected in series so that the added voltage is greater than the power supply voltage, and this added voltage is applied to both ends of the heater wire. but,
The potential difference between the contact wire body and the heater wire does not exceed the maximum value of one power supply voltage. Therefore, compared to the conventional method, even if the potential difference between the contact wire body and the heater wire is the same, a voltage up to twice as high is applied to both ends of the heater wire.

When a plurality of contact wires are arranged in series and each is provided with the above-mentioned AC current carrying circuit, a single AC power supply is arranged at the butt part, and each power supply is connected in series with any power supply adjacent to both sides. They are connected by the contact wire body so that the heater wires are connected by the contact wire body, and an additional voltage is applied to all heater wires by connecting two power supplies in series.

In addition, the controller that controls turning on and off the power is designed to control the energization of the heater wires installed on both sides, and although it is installed at every other power source, each of the heater wires It is designed to control energization.

However, it is important to have a unique controller for each power supply, and
This does not preclude energization control of three or more heater wires using a single controller.

(Embodiments) Hereinafter, preferred embodiments of the energizing device for preventing freezing of a contact wire according to the present invention will be described in detail with reference to the drawings.

FIGS. 1(a) and 1(b) show an embodiment of the present invention and show a basic current-carrying circuit, in which a contact wire 10 is connected to a contact wire main body 1.
1 and a heater wire 12 built in and insulated from the contact wire main body 11, and a direct current of 1500 V is applied to the contact wire main body 11 and the overhead contact line 14 via a feeder wire 13 by a direct current power source 20.

Insulation transformers 21-1 and 21-3 are used as alternating current power supplies provided at both ends of the heater wire 12, and the second winding is attached to a contact line support etc. to supply power for signal circuits and maintenance power. It is connected to the distribution line 15 that is located in the area. One end of the heater wire 1
2a is connected to one terminal on the secondary winding side of the isolation transformer 21-1 via the switch 23-3, and the other end of the secondary winding is connected via the capacitor 22-I and the switch 23-2. and is connected to the contact wire main body 11.

Furthermore, the contact wire main body 11 connects one terminal on the secondary winding side of the isolation transformer 21-2 and the capacitor 2 at the other end of the contact wire.
2-2 via a switch 23-5. The other terminal of the secondary winding of the isolation transformer 21-2 is connected to the switch 23
-4 to the other end L2b of the heater wire, and at this time, the secondary winding of the isolation transformer 21-1, 21-2 is connected in series by the contact wire main body 11 and the heater wire 12, and the The sum of the voltage vectors is the heater wire 12
The phases are adjusted so that the signals are added and applied to both ends of the signal. That is, as is clear from the circuit shown in FIG. 1(b), V sin θ-(-V
sinθ)=2V6 inθ voltage is applied. On the other hand, there is Vsin between the heater wire 12 and the contact wire main body 11.
Only a voltage of θ is applied.

In the anti-icing energizing device as described above, when the switch 23 is turned on and energized, a voltage equal to the sum of the maximum voltages generated in the secondary winding is generated at both ends of the heater wire 12 as described above. . Therefore, compared to the conventional case, the contact wire body
Even if the potential difference generated between the heater line 12 and the heater line 12 is the same, the voltage applied between the heater line drawing ends 12a and 12b is doubled at maximum. Therefore, even if the length of the contact wire is increased to double the length of the heater wire for electrical heating, the same amount of heat can be obtained without changing the insulation performance.

In addition, even if the contact wire main body 11 is charged with DC high voltage by the DC power supply 20, the capacitor 22 prevents the current from being shunted to the secondary winding of the isolation transformer, and even when the electric train 30 is running. , Trolley! 11, heater wire 12, and two insulating transformers can be supplied with alternating current, making it possible to prevent the contact wire from freezing. Further, by using an isolation transformer as the power source of the AC current carrying circuit, it is possible to prevent 1500 V DC from flowing into the primary side in the event of an abnormality on the secondary side.

FIG. 2 shows an embodiment in which the anti-icing energizing device of the present invention is installed in a long section such as a main line. Main body 11-+ to 11-. and a built-in heater wire 12-+=12-4, which is tied at each length. Isolation transformer 2 at each detent position
1-1 to 21-4 are installed, and at every other location,
Sensors 25-1 to 25 that detect the surface temperature of the contact wire
-4 and controllers 26- to 26-2 that control the switch 23 that turns on and off the electricity.

Isolation transformer with controller (code 21-2.21-
One terminal on the secondary winding side of each of the coils 4, . The other terminal of the secondary winding is connected to the tramway 14 by a DC power supply 20.
The contact wire main body 11 to which 1500 V DC was applied between
It is connected to the. One terminal of the secondary winding of an isolation transformer (for example, code 21-s) that is not equipped with a controller 26-1 and 26-2 is connected to the contact wire main body 11, and the other terminal is arranged on both sides. Contact wire to-i, 1O-3
is connected to both heater wires 12-2 and 12-1.

At this time, each of the isolation transformers 21-5 to 21-4 is connected in series with the phases matched so that a double added voltage is generated.

In such a current-carrying device, the sum of the currents of the current-carrying circuits on both sides flows through the secondary winding of each isolation transformer, but it is possible to supply power to the current-carrying circuits on both sides with one isolation transformer.

For example, from the secondary winding of the insulating transformer 21-8, an energizing circuit including the contact wire main body 11-2, the secondary winding of the insulating transformer 21-1, and the heater wire 12-2, and the contact wire main body 11 −
3 and the secondary winding of the isolation transformer 21-3 and the heater wire 12-
Power is supplied to both the energized circuit and the energized circuit including 3 and 3. Therefore, it is necessary to use an insulating transformer with sufficient capacity to supply power to both, but the insulating transformer 21-2 is connected to the heater wire 12-2.
2 and the secondary winding of the isolation transformer 21-1 can be applied to the heater wire 12.
1-2 and the voltages occurring in the secondary windings of the isolation transformer 21-3 can be applied.

The operation will be described below using section 1O-3 as an example.

Sensor 25-1 provides a temperature signal of contact wire main body 11-3 to controller 26-1. When the surface temperature of the contact wire main body 11- becomes below 00C, the controller 26-
Switch 23 connected to 2-1 is turned on, and the isolation transformer 2
1-1.Additional voltage 2Vs which is the sum of the power supply voltages of 21-1
Inθ is applied to heater wire 12-8. When the surface temperature of the contact wire main body 11-1 rises to a predetermined temperature due to the heat generated by the heater wire 12-1, the controller 26-1 releases the switch 23 connected to the heater wire 12-1 to cut off the power. do.

FIG. 3(a) shows an example of the energizing device of the present invention in which the primary winding of an isolation transformer is connected to a three-phase power distribution line.

The primary windings of the isolation transformers 21-+ to 21-8 are sequentially connected to different phases so that load imbalance among the three phases does not occur. Similar to the embodiment shown in FIG. The system is designed to charge electricity.

In this embodiment, as shown in FIG. 3(b), the vector sum of voltages generated in the secondary windings of adjacent isolation transformers is
They are connected in such a phase that +92 is applied to both ends of the heater wire. Therefore, a voltage 13 times the phase voltage is applied across the heater wire.

In addition, by sequentially connecting the primary windings of a plurality of isolation transformers to different phases, there is no imbalance in the load on the three-phase distribution line (as in the embodiment shown in Fig. 2, the long section It is possible to obtain an energizing device that spans a wide range.

In addition, as a method to prevent load imbalance between phases when receiving power from three phases, the number of isolation transformers to be installed is divided into three, and isolation transformers that receive power from the same phase are placed in succession, and one heater It is also possible to have the isolation transformers at both ends of the line be in phase so that the sum of the voltages occurring across the secondary windings is applied.

(Effects of the Invention) As explained above, in the contact wire anti-icing energizing device of the present invention, the AC power supplies placed at both ends of the contact wire are connected in series, and the added voltage of the vectors of the two power supplies is applied to both ends of the heater wire. By applying , a voltage up to twice the potential of the contact wire main body and the heater wire can be applied to both ends of the heater wire.

As a result, we have been able to change the length of the existing contact wire on the main line, that is, the distance between the retaining positions (approximately 800 to 1600 m), and to make double ear connections using the same cross-section of the contact wire as used in the conventional method. without doing anything,
It is possible to obtain an economical energizing device for preventing freezing of contact wires, which generates a sufficient amount of heat and is inexpensive to repair.

In addition, when energizing equipment is installed continuously over a long section, one insulating transformer is installed at each butt part of the contact wire, and power is supplied to the heater wires on both sides, and one insulating transformer is installed at one location. By placing a controller at every interval, the installation cost is low because the number of isolation transformers and controllers is small, and it is an economical current-carrying device that can heat only the necessary area over a long section. can get.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are explanatory diagrams showing one basic energizing circuit and its equal low circuit, which is an embodiment of the present invention. FIG. 2 is an explanatory diagram showing an embodiment of the present invention in a long section on a main line. FIGS. 3(a) and 3(b) are explanatory diagrams and vector diagrams showing another embodiment of the present invention in a long section. FIG. 4 is an explanatory diagram showing a conventional energizing device for preventing freezing of a contact wire. Explanation of codes 10...Trolley wire 11...Trolley wire body 12...Heater wire 13...Feeder wire 14...Tram track 15 ...Distribution line 20...DC power supply 21...Isolation transformer 22...Capacitor 23...Switch

Claims (2)

[Claims] (1) In an energizing device for preventing freezing of a contact wire, which supplies an alternating current to an energizing circuit including a contact wire main body to which a direct current voltage is applied and a heater wire built in insulated from the contact wire, both ends of the heater wire are provided. An energizing device for preventing freezing of a contact wire, characterized in that an AC power supply is arranged in the contact wire, these power supplies are connected in series through the contact wire main body, and an additional voltage of the power supply is applied to both ends of the heater wire. (2) An anti-icing energizing device that prevents freezing of the contact wire by energizing a heater wire built into the contact wire, which is connected to both ends of the heater wire and forms a closed loop circuit together with the contact wire; two power supply circuits that apply an additional voltage larger than the individual power supply voltages to the heater wire; a detection means that detects the temperature of the contact wire; and an opening/closing means that applies and cuts off the power supply voltage to the heater wire; An energizing device for preventing freezing of a contact wire, comprising a control means for controlling closing and opening of the opening/closing means based on the temperature detected by the detection means.