JPS58204702A - Safety device for electric motor vehicle - Google Patents

Abstract

PURPOSE:To prevent an electric shock at the inspecting time such as a no-load notch test or the like and to improve the safety by providing an auxiliary contact which is interlocked with main and auxiliary circuit switches in a display lamp circuit and indicating the opening or closing state of the switches. CONSTITUTION:A display lamp circuit has a contact 30 of a current relay 18 which is opened while a main circuit current is detected and closed during the stop of an electric motor vehicle, connected in series with a parallel circuit of an auxiliary contact 31 which is interlocked with a main circuit switch 13 and an auxiliary contact 32 which is interlocked with an auxiliary circuit switch 25. Further, a parallel circuit of display lamps 33, 34 which are provided underneath the floor of the vehicle is connected in series with the parallel circuit of the auxiliary contacts 31, 32, and the current of the display lamp circuit is flowed through ground switch 35 to a track. In this manner, the opening or closing of the main and auxiliary switches are confirmed at the inspecting time of an equipment, thereby preventing a trouble such as an electric shock or the like.

Description

[Detailed Description of the Invention] [Description of the Technical Field] The present invention relates to a safety device during an empty notch test of an electric vehicle running in a multi-voltage section [Description of the Prior Art] Overhead line! In an electric car running in a multi-voltage section where the voltage is, for example, DC600V and DC1500V, the resistance of the main resistor connected in series from the overhead wire to the main circuit containing the electric motor via the main circuit breaker and main contactor. It has a contactor that switches the value according to the voltage of the frame. Further, the auxiliary circuit having a compressor is connected from the overhead line via an auxiliary circuit switch and an auxiliary contactor, and has a contactor that switches the resistance value of a resistor according to the overhead line voltage. This auxiliary circuit includes
In addition to the compressor circuit, there are a heater circuit, a circuit for obtaining an auxiliary power source, a voltmeter circuit, a lighting circuit, a fan circuit, etc., and the overhead line voltage is applied to each of these auxiliary circuits via an auxiliary circuit switch.

When an electric vehicle equipped with these devices is inspected in a garage, the operation of the devices is checked by conducting an empty notch test, etc. while the overhead line voltage is still applied.

In that case, the main circuit breakers and some auxiliary circuit breakers must always be inspected with them open.

However, if the inspection was performed without opening the main circuit breaker or the auxiliary circuit breaker, the main contactor connected in series with the main circuit would open and close during the empty notch test, and the electric vehicle There is a risk of electric shock accidents caused by running or moving equipment. In addition, since the auxiliary contactor of the auxiliary circuit is always closed, there is a risk of electric shock caused by neglecting to open the auxiliary contactor when inspecting the equipment and causing an electric shock to the contactor used to switch the resistance value. Problems] Failure to open the main circuit breaker and auxiliary circuit breaker during inspection may lead to accidents such as electric shock to the equipment, and the layout of the equipment on the electric train may cause problems. If the main circuit breaker and the auxiliary circuit breaker are located apart from each other, there is a risk of forgetting to open them.

[Object of the Invention 1] An object of the present invention is to provide a safety device that prevents electric shock to equipment during inspections such as empty notch tests of electric vehicles.

[Summary of the invention]

An auxiliary contact that moves on the main circuit breaker and the auxiliary circuit breaker is provided in the indicator light circuit, so that the open state of the switch is indicated by the indicator light.

[Embodiments of the invention]

(composition) Next, the present invention will be explained based on the embodiment shown in FIG.

T pressure is applied to the electric car from the overhead wire 10 via the pantograph 11. The main circuit of the electric vehicle has a main circuit fuse 12, a main circuit switch 13 and an electric motor 16.17 to which overhead line voltage is applied via a contactor 14.15. Also, a current relay 18 that detects the current flowing in this main circuit
And electric 4! ! A main resistor 21 is connected in series with the field winding 19.20 of 16.17.

For this main resistor 21, a resistor 22 is connected to the main resistor 21 according to the overhead line voltage.
is connected. Furthermore, the main circuit current flows to the track via the earthing switch 23.

On the other hand, the auxiliary circuit of the electric vehicle for driving the compressor etc. is the auxiliary circuit fuse 24. Compressor 2 to which overhead line voltage is applied via auxiliary circuit switch 25 and contactor 26
7. This auxiliary circuit °・Ma, compressor 2
It has a resistor circuit 28 including a contactor connected to 7 in accordance with the overhead line voltage. Furthermore, the auxiliary circuit current flows to the track via the earthing switch 29 - the indicator light circuit is applied with a power supply voltage supplied by a battery, not shown. In this indicator light circuit, the contact 30 of the current relay 18, which is open while detecting the main circuit current and closed when the electric vehicle is stopped, has an auxiliary contact 31 that works in conjunction with the main circuit breaker 13, and an auxiliary circuit breaker. A parallel circuit of 25 and a moving auxiliary contact 32 is connected in series. Furthermore, the hook row circuit of indicator lights 33 and 34 provided under the floor of the electric car is connected in series to the parallel circuit of auxiliary contacts 31 and 32, and the current in the indicator light circuit flows to the track via the earthing switch 35. .

(Effect) When inspecting equipment such as empty notch test of electric vehicle, main circuit switch 1
3 and the auxiliary circuit switch 25 are opened, the indicator light 33
and 34 go out, confirming that the switch 13.25 is open. In this case, since the electric vehicle is stopped, the contacts 30 are closed. The reason why the indicator lights 33 and 34 are connected in parallel is to allow the other to operate normally even if one is disconnected. If you forget to open either the main circuit breaker 13 or the auxiliary circuit breaker 25, the indicator lights 33 and 34 will light up, which will alert you when inspecting the equipment, and make sure that the indicator lights are off. Figure 2 shows the switch 1 circuit, which is different from the 2nd indicator circuit shown in Figure 1.
A series circuit of auxiliary contacts 36 and 37 interlocked with auxiliary contacts 3 and 25, respectively, is connected to a battery (not shown) via a contact 30. An indicator light 38 is connected to the contact 37,
The current of the indicator light circuit flows to the track via the earthing switch 35. In this case, if both the switches 13 and 25 are opened, the contacts 36 and 37 are closed and the indicator light 38 is lit, allowing confirmation that the switches 13 and 25 are open. Indicator light 38
In the event of a disconnection, the indicator light will not light up in any case, so it will not be possible to confirm whether the switches 13 and 25 are open, and it will be necessary to confirm that the circuit is open again, so safety can be ensured when inspecting the equipment. [Effects] According to the present invention, the opening and closing states of both switches can be checked by turning off or turning on the indicator light circuit using the auxiliary contacts that are linked to the opening and closing of the main circuit breaker and the auxiliary circuit breaker. Therefore, it is possible to prevent accidents such as electric shock by checking whether the main circuit breaker and auxiliary circuit breaker are open or closed when inspecting the equipment mounted on the vehicle.

[Brief explanation of the drawing]

・Figure 1 is a single main circuit and indicator light circuit diagram based on the present invention, and Figure 2 is another draft of the indicator light circuit diagram based on the present invention.
J de chiru. 13... Main circuit switch, 25... Packing auxiliary circuit island switch,
31, 32.36.37... Auxiliary contact, 33.34.
38... Indicator light.

Claims (3)

[Claims] (1) A main circuit breaker installed in the main circuit including a motor that receives voltage supply from the overhead wire, an auxiliary circuit breaker installed in the auxiliary circuit that receives voltage supply from the overhead wire, and the main circuit breaker and the auxiliary circuit. A safety device for an electric vehicle that includes an indicator light circuit that indicates when a switch is open. (2) The safety device R for an electric vehicle according to claim 1, wherein the indicator light circuit has a parallel circuit with an auxiliary contact of the main circuit switch and an auxiliary contact of the auxiliary circuit switch. (3) The electric vehicle safety device according to claim 1, wherein the indicator light circuit has a series circuit with an auxiliary contact of the main circuit switch and an auxiliary contact of the auxiliary circuit switch.