JPS6055802A - Current collector for chopper controlled railcar of third rail current collection type - Google Patents

Abstract

PURPOSE:To enable to reliably protect the third rail current collector even if an arc occurs between the collector and rails by providing an arc protecting plate at the side near the main rail of a supporting frame of the collector. CONSTITUTION:A current collecting shoe 5 of the third rail current collector is projected so as to be pressed by a suitable pressing force to the third rail 1 by a spring rotatably by a pin 7 from a supporting frame 6. Further, an arc protecting plate 16 is mounted to the frame 6 with mounting bracket 14 and a mounting bolt 15 at the lower side of the frame 6 of the shoe 5. Thus, even if an arc occurs between the third rail current collector 6 and the main rail 3, the arc is shifted to the plate 16. Accordingly, it can prevent the frame 6 from damaging.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a current collector for a chopper-controlled vehicle using a third rail current collection system.

[Technical background of the invention and its problems]

In general, subway cars and other vehicles use a third rail current collection system to reduce the size of the tunnel, and in recent years, it has been used to save energy and prevent service to passengers during the summer from worsening due to temperature rise inside the tunnel. Therefore, chopper-controlled vehicles have come to be used.

However, as vehicles have become equipped with chopper controllers, the following problems have arisen. The power circuit shown in Figure 1 and the regeneration circuit shown in Figure 2 both operate at high frequencies, and the circuits are opened and closed using chopper control, but smoothing, which has a large actance, smoothes the current that acts on the main motor. A reactor is inserted into the circuit. For this reason, the third rail current collector separates from the third rail when the vehicle passes through a branch crossing line during both traveling and regeneration, but at that time, the current interrupting performance between the two is poor. It tends to cause an arc to occur. In this case, there is no problem because the arc during power running is naturally cooled and shut off because it flies between the positive potential of the third rail moxibustion and the negative potential of the third rail east current collector. Another phenomenon may occur if the vehicle passes through a branch crossing line during regenerative braking. In other words, the potential of the third rail east current collector with a positive potential is the same as that of the third rail east collector with the same positive potential.
Current regeneration is impossible unless the rails are higher. Here, the arc that occurs when the third rail current collector separates from the third rail when passing the branch crossover wire is caused by the fact that energy was being supplied to the third rail from the third rail current collector, so where is the lowest point? It has the possibility of jumping to a place with a potential of . Therefore, in the case of the third rail current collector, the support frame that supports the current collector shoe is electrically charged and is placed closer to the center of the vehicle body, so when the third rail current collector is about to pass through the crossover wire, the support frame is charged with a potential. It is conceivable that the above-mentioned arc jumps to the main rail when it crosses directly above the main rail with a low height. In this way, if an arc jumps from the support frame of the third rail current collector to the main rail, an overcurrent will naturally flow due to the potential difference, and the circuit breaker will operate to interrupt the regeneration circuit, but originally consideration was not given to arcing. If an arc occurs in the third rail current collector support frame or its mounting portion, which is not installed, a partial melting phenomenon will occur, which will be extremely inconvenient in terms of the functionality and maintenance of the third rail current collector.

[Purpose of the invention]

The present invention was developed in view of the above circumstances, and when the third rail east current collector passes through a crossing line during regenerative braking, it may become detached from the third rail and the regenerative current may be cut off. 76
Even if an arc occurs between the third rail current collector and the rail, the third rail current collector can be reliably protected and the function may be impaired or maintenance may be inconvenient. An object of the present invention is to provide a current collector for a chopper-controlled vehicle using a third rail current collection system, which can prevent the above.

[Summary of the invention]

Considering the location of F)H, it is just before the station, and the train is still at a high speed train where it is applying deceleration braking, so it is likely that it is in the process of applying regenerative braking. This is a difficult situation to avoid. For this reason, if the 3rd rail current collector is separated from the 3rd rail east by suddenly crossing the crossing line while regenerative current is flowing to the 3rd rail, the regenerative current will be cut off, but the circuit will not be smoothed. Because a reactor, a main reactor, and a filter capacitor are arranged, the electric potential of the capacitor increases at the same time as the arc jumps in order to keep the current flowing between the third rail current collector and the third rail. As a result, an arc occurs at the tip of the TEPCO shoe on the 3rd rail Totoden, but since the support frame of the collector shoe crosses close to the top of the main line rail, the arc can jump from the support frame to the main line rail below. be. Therefore, by providing an arc protection plate on the lower side of the support frame of the third rail current collector on the side that approaches the main line rail, it is possible to prevent arcs from occurring between the protection plate and the main line rail. With this structure, even if the arc were to accidentally jump between the main rails, the third rail current collector itself would be protected and would not be damaged. During regenerative braking of such a chopper-controlled vehicle, the arc that physically occurs between the third rail and the third rail east current collector is made to jump to a specific protective plate, and that protective plate has strong arc resistance. In the case of materials or materials with weak arc resistance, maintenance can be facilitated by creating a structure that allows easy replacement.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

First of all, Figure 1 shows the main circuit configuration of a chopper-controlled vehicle using the Kame 3-gauge, East-Shi, 1-Koden system, which is subject to Kienori, when it is moving.
Figure 2 shows the configuration of the main circuit during regenerative braking. To briefly describe the basic configuration of this main circuit, the SC is the third
t: L strip current collector, FL is filter reactor, H
B is high speed circuit breaker, F (Jj filter condenser,
AI to A4 are motor armatures, Fl-F4 is a motor field, MSL is a main smoothing reactor, MSL is a flywheel diode, and CH is a chopper device.

Figure 3 also shows the relationship between the third rail and the third rail current collector and the running rail during normal running.1 is the third rail, and 2 is insulated by the third rail support insulator. Supported.

Reference numeral 3 denotes main rails for running, both of which are supported on a trackbed 4. Reference numeral 5 denotes a third rail current collector SCO current collector shoe, which is rotatable from a support frame 6 to a pin 7 and is protruded so as to be pressed against the third rail 1 with an appropriate pressing force by a spring (not shown). There is. In addition, the current collector shoe 5 has a stopper contact surface 9 on a stopper 8 provided on the support frame 6 in a place where the third rail 1 is not provided.
are in contact with each other and are prevented from rotating below the specified height. Further, reference numeral 11 is a height adjustment seat having serrations that is attached to the insulating beam 10 so that the height of the entire support frame can be adjusted. The insulating beam 10 is generally supported via a rubber seat or the like having a cushion made of an axle box in order to keep the positional relationship between the collector shoe 5 and the third rail 1 as constant as possible. .

Figure 4 shows the trajectory of an arc during regenerative braking, which is expected to actually occur in a normal 3rd gauge east current collector device. As the train runs, the third rail current collector support frame 6 approaches the main rail 3B, and the arc 1 that occurs when the third rail branch guide 12 protruding from the third rail 1 and the current collector shoe 5 separate from each other.
3k indicates the possibility of transitioning to an arc of 73B between main rail 3B.

5 and 6 show an embodiment of the third rail current collector device of the present invention, in which an arc protection plate 16 is provided on the lower side of the support frame 6 of the current collector shoe 5.
Attach with mounting bracket 14? It is attached to the support frame 6 with a bolt 15, and the arc 13C is configured to jump between the arc protection plate 16 and the main rail 3B.

Figure 7 is an explanatory diagram of the state in which a third-rail type vehicle crosses a ferry line, where 17 is the vehicle's bogie, 18 is the wheel, 5 is the
B is the third rail collector shoe, 3A to 3G are the running rails, IA
, IB is the third rail.

First, to explain the circuit operation when the motor armature AINA4 and the motor fields F1 to F4 are connected in the horizontal direction in FIG. 1, the current collected by the third rail current collector SC is is grounded by the chopper device CH via the main smoothing reactor MSL and flows as a main circuit current, and the vehicle is powered by the motor. At this time, the chopping device CH controls the current value according to the energization rate by interrupting the circuit current at high frequency. Furthermore, even when the chopper device CH becomes QFF, there is an effect of continuing the stain current in the main flat slip axle MSL, and the current is returned to the motor armature A1 + A3 through the flywheel diode, in the attenuation direction. However, current continues to flow through the motor and the vehicle continues to move extremely smoothly. Even if the third rail current collector SC goes out of line under such conditions, the third rail current collector SC only functions as a circuit breaker, and does not have the effect of keeping the arc flowing.

Next, to explain the electrical characteristics when regenerative braking is applied using Figure 2, motor armatures A1 to A4
In contrast to K, the motor field F1%F4 is connected in the opposite direction to generate power, and at the same time, the four motors are connected in a cross-rotating manner so that they have equal power generation effect, which is the same as in conventional dynamic braking. However, the chopper device CH
is turned on at regular intervals depending on the energization rate according to the required braking force.
, repeat OFF. In this case Cho7・zf-device C
When H is ON, motor armature A 2 + A
Since CH 4 is grounded, it is connected to the ground of the chopper device and a brake current is passed through it, but the chopper device CH
When is OFF, the circuit is cut off, so the current flowing in the main smoothing reactor MSL flows through the flywheel diode gate and towards the third rail current collector SC, and its voltage rises above the positive potential of the third rail. By doing so, the regenerative current flows back to other vehicles or substations that are powering, releasing the energy of the vehicle and decelerating it. If the 3rd rail east current collector SC suddenly separates and attempts to interrupt the current, an arc occurs between the 3rd rail Shiba current collector SC and the 3rd rail, and the energy that is about to be generated from the motor is is continuously supplied, the voltage drop caused by the arc is accumulated in the filter capacitor FC, and the potential on the third rail current collector SC side tends to continue rising. When the potential of the filter capacitor FC exceeds a certain value, an overvoltage relay (not shown in the diagram) detects this and closes the grounding circuit, opening the regenerative brake circuit. It is inevitable that the potential on the third rail current collector SC side will rise significantly in a short period of time.

For this purpose, as shown in Fig. 7, at the branch point where the 3F and 3G crossing lines are placed between the 3B and 3C rails and the 30.3E rail, the right side of the figure Vehicle bogie 17 came running from JA.

If you ride on the 3G rail and apply regenerative braking while entering a branch, the 3rd rail is only placed at JA and IB, so the 5A 3rd rail collector shoe is at I.
The 4th rail is located on the main line side rail 3B, away from the 3rd rail of A.
Approach as shown in the figure, and at the same time, branch guide 1 of 3rd rail east 1.
The third rail current collecting shoe 5 separates from the second rail, and at this time, as mentioned above, the arc due to the regenerative current becomes high potential, and since the regenerative current continues to flow, it is not possible to interrupt the intermediate current, and Since the rail 3B approaches the bottom of the 3-gauge current collector support frame 6, the arc 13 instantly jumps to the ground side of 13B.

The overcurrent relay is activated by the arc 13B that jumps in this way and tries to quickly cut off the current, but this arc 13B generates enough energy to melt and damage the third rail current collector support frame 6. However, there may be inconveniences such as having to replace the support frame 6, which is originally a permanent structure, or the current collector 5.
Problems such as loss of supporting function occur.

By the way, in the current collector device of FIG. 5 and FIG. 6 of the present invention described above, the lower side of the support frame 6 is sufficiently extended in the front, rear, left and right directions to cover the lower surface of the support frame 6, and the four corners are sharpened in various ways. Place the arc protection plate 16 in the shape of 15. Since it is attached to the mounting bracket 14, the arc at 13 will not jump to the nearest arc protection plate 16 as shown at 13C as shown in FIG. It will no longer move and cause damage. Also, unlike the support frame 6, the arc protection plate 16 itself is flat with no protrusions or sharp corners here and there, so there is little chance of the arc moving, and the chances of the arc jumping to 13C are relatively small. You will be able to obtain the effect of decreasing.

Also, the arc protection plate 16 may be slightly damaged by the arc of 13C, but this can be easily disassembled and repaired by the delt 15, and damage to the expensive support frame 6, which is conventional, can be prevented. . Regarding the material of this arc protection plate 16, there are various ideas such as using inexpensive structural materials and replacing them frequently, and using materials with strong arc resistance to ensure a long life and easy maintenance even though the cost is high. It is possible to configure various configurations.

FIG. 8 shows another embodiment of the invention in which the arc protection plate is divided into front and rear sections as shown at 16 and 16B. If the arc protection plate is separated with a slit in the center like this, the arc will easily fly not only at the left and right edges but also at the slit edge in the center as shown in Figure 8. The arc will jump to some edge. Taking care to make it easier for the arc to jump between the lower rail and the lower rail means that if insulation measures are taken to make it difficult for the arc to jump to the lower rail, the arc will conversely jump to the upper rail. There is a concern that it may jump onto the bogie or the car body, posing a danger to passengers, or melting down the strength members of the bogie, leading to a serious accident. It is very convenient to eliminate them and is also advantageous from a safety standpoint.

〔Effect of the invention〕

Since this invention has been made as described above, in a chopper-controlled vehicle that is applying regenerative braking using the third rail current collection method, the third rail current collector is separated from the third rail at a branch crossing line, etc. It is very difficult to prevent arcs because the circuit is prone to sustaining arcs, but since the arc protection plate covers the bottom of the third rail current collector support frame, the shape It is possible to reliably prevent the arc from jumping around and melting down the physically complex and expensive support frame, and it also has the effect of making maintenance easier, as well as preventing damage to the function of the third rail current collector. There were no such problems, and we were also able to prevent arcs from flying from the third rail current collector to the bogie structure, which would have caused serious damage to the bogie, resulting in a major accident, and endangering passengers. Safety can be improved without any damage.

[Brief explanation of the drawing]

Figure 1 is a basic configuration diagram of the main circuit of a third-rail current collection type chopper-controlled vehicle, Figure 2 is an explanatory diagram when the main circuit in Figure 1 is switched to regenerative braking, and Figure 3 is a diagram of the normal main circuit. An explanatory diagram showing the relationship between the 3-rail current collector device and the 3rd rail during normal running, Figure 4 shows what occurs when running on a branch line while applying regenerative braking using the same normal 3-rail current collector device. An explanatory diagram of an expected arc, FIG. 5 is a diagram corresponding to FIG. 4 showing an embodiment of the present invention, FIG. 6 is a perspective view of the third rail current collector device in FIG. An explanatory diagram showing the relative position of the branch crossing line and the truck, which may cause an arc between the third rail and the third rail current collector, and FIG. 8 is a front view showing another embodiment of the present invention. be. SC...3rd rail current collector, FL...filter +1
Accelerator, HB...High speed circuit breaker, FC...Filter capacitor, AI~A4...Motor armature, Fl~F4...Motor field, I', 4
SL...Main smoothing reactor, FWIJ...Flyboil diode, CH...Chonnoya device, 1,
1A, IB...Third rail, 2...Third rail support insulator, 3...Main rail, 38-3G...Waterway branch rail, 4...Track bed, 5° 5A, 5B ...Nenden shoes, 6.
... Z (53 rail current collector shoe support frame, 7... Rotation center bin, 8... Stock-19... Shoe side stopper contact surface, 10... Insulating beam, 11... Height adjustment wheel, 12.
...Third rail branch guide, 13A-13C...Arc, 14,141.14B...Mounting bracket, 15, 15
A, 15 B...Mounting port, 16.16,
16B... Arc protection plate, 17... Trolley, 18...
·Wheel. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 4 Figure 6 Figure 10- Figure 8

Claims (3)

[Claims] (1) In a chopper-controlled vehicle that collects current from the third rail using the third rail current collector, and in a vehicle that performs regenerative braking while returning current to the third rail, the ground-grounding structure of the third rail current collector 1. A current collector for a chopper-controlled vehicle using a third rail current collection system, characterized in that an arc protection plate is provided on a side closer to the current collector. (2) The scope of the claim characterized in that the arc protection plate is attached to the lower part of the collector shoe support frame of the third rail current collector so as to extend in the longitudinal direction from the support frame. 1st
A third rail current collection type current collector for a Cho7-controlled vehicle as described in 1. (3) The arc protection plate according to claim 1 or 2 is characterized in that the corners of the arc protection plate have a slightly pointed shape or are divided into front and back parts to facilitate the generation of arcs in a concentrated manner. Current collector for chopper control vehicles with third rail current collection system.