KR200279044Y1 - A Circuit for controlling load power - Google Patents

Abstract

The present invention is to provide a DC train load power control circuit that can simplify the circuit configuration to reduce the cost (Cost) and reduce the failure rate through a simple circuit configuration and ultimately improve the reliability of the circuit operation. The load power control circuit of the present invention includes a plurality of rectifiers, a plurality of high speed DC circuit breakers serially connected to an output terminal of the rectifier, a negative electrode connected to a rail, and a plurality of disconnectors connected between the rectifier and the negative electrode. And applying the output of the high speed DC circuit breaker to a vehicle when any one of a positive wire connected to an output terminal of the high speed DC circuit breaker, a plurality of high speed DC circuit breakers for the feeder connected to the positive line, and the high speed DC circuit breaker for the feeder fails. And a high speed DC circuit breaker for the bypass feeder, and a plurality of lightning arresters branched to output terminals of the feeder high speed DC circuit breakers and connected to the ground terminal.

Description

DC Circuit Load Control Circuit {A Circuit for controlling load power}

The present invention relates to a power supply device for a DC train, and more particularly to a load power control circuit of a DC power supply device suitable for reducing the failure rate and improving reliability by simplifying a control circuit for controlling the supply of power to a vehicle.

As shown in FIG. 1, a power supply system for a DC train includes a first system 11 for supplying electric power supplied by a power company to a vehicle, and a second system for supplying electric power for consumption in history. 12).

That is, the power of the extra-high voltage supplied from the electric power company 1 is distributed to the power to be supplied to the vehicle and the power to be consumed in the history in the high-voltage switchgear 2, wherein the power to be supplied to the vehicle is a rectifier transformer 11a, rectifier 11b, DC switchboard 11c and tramline 11d, which are supplied to the vehicle, and power to be consumed in the history is distributed transformer 12a, high voltage switchboard 12b, step-down transformer 12c. And the low pressure switchboard 12d are supplied to the various loads 12e in the station.

Here, the DC switchboard 11c for supplying and controlling the load, which is a vehicle, is closely related to the failure rate, which is a very important part in the power supply system.

2 illustrates a configuration of a load power control circuit for supplying and controlling power to a DC switchboard, that is, a load (vehicle) according to the prior art.

As shown in FIG. 2, the load power control circuit has a high speed connected serially to the output terminals of the first and second rectifiers REC_1 and REC_2 and the first and second rectifiers REC_1 and REC_2. DC circuit breaker (HSCB_R1) (HSCB_R2), the negative electrode 22 connected to the rail 21, and the first, second rectifier (REC_1) (REC_2) and the first, connected between the negative electrode 22 High speed DC circuit breaker (HSCB_F1) for a plurality of feeders connected to a second disconnector (DS_R1) (DS_R2), an output line of the high speed DC circuit breaker (HSCB_R1) (HSCB_R2), and a plurality of feeders connected to the anode line (23) (HSCB_F3) (HSCB_F4) and the high-speed DC circuit breaker (HSCB_R1) (HSCB_R2) outputs the bypass circuit breaker (DS_B1) (DS_B2) (DS_B3) High speed DC circuit breaker (HSCB_BY) for bypass feeder and HSC DC circuit for feeder Feeder disconnector (DS_F1) (DS_F2) (DS_F3) (DS_F4) connected between the output terminal of B_F1) (HSCB_F2) (HSCB_F3) (HSCB_F4) and the vehicle, and the high speed DC circuit breaker (HSCB_F1) (HSCB_F_) (HSCB_F4) includes a lightning arrester (LA_1) (LA_2) (LA_3) (LA_4) connected to the ground terminal branched to each output terminal.

The load power control circuit configured as described above supplies power to the vehicle through a rectifier (REC) → a high speed DC circuit breaker (HSCB_R) → a bipolar wire → a high speed DC circuit breaker (HSCB_F) for a feeder, and the power supplied to the vehicle is returned to a rail (21). The negative electrode 22 flows to the rectifier REC through the disconnector DS_R.

However, the conventional load power control circuit as described above has a high-speed DC circuit breaker for the feeder in order to cut off and disconnect the circuit in the event of a short circuit and overload, but the feeder disconnector having the same function is serially connected at the bottom thereof. In order to separate the fault circuit, the feeder's high-speed DC circuit breaker and the feeder disconnector are only duplicated, so that the circuit configuration is unnecessarily complicated. As a result, the cost of the control circuit is increased and the reliability is lowered. there was.

The present invention has been made to solve the problems of the conventional load power control circuit as described above, and by simplifying the circuit configuration to reduce the cost and to reduce the failure rate through a simple circuit configuration, ultimately to improve the reliability of driving the circuit. It is an object of the present invention to provide a DC power load power control circuit.

DC train load power control circuit of the present invention for achieving the above object is a plurality of rectifiers, a plurality of high-speed DC circuit breakers serially connected to the output terminal of the rectifier, a negative electrode connected to the rail, the rectifier and the negative electrode A breaker connected between the plurality of disconnectors, a positive wire connected to the output terminal of the high speed DC circuit breaker, a plurality of high speed DC circuit breakers for the feeder connected to the positive line, and the high speed DC circuit breaker for the feeder, A high speed DC circuit breaker for the bypass feeder for applying the output to the vehicle, and a plurality of lightning arresters branched to the output terminal of each of the high speed DC circuit breaker for the feeder connected to the ground terminal.

1 is a schematic diagram of a power supply system of a general DC train

2 is a block diagram of a load power control circuit according to the prior art

3 is a configuration diagram of a DC train load power control circuit according to an embodiment of the present invention

* Description of the symbols for the main parts of the drawings *

21: rail 22: negative electrode

23: positive pole REC: rectifier

DS_R: Disconnector HSCB_R: High Speed DC Circuit Breaker

HSCB_F: High speed DC circuit breaker for feeder DS_BY: Disconnector for bypass feeder

HSCB_BY: High Speed DC Circuit Breaker for Bypass Feeder

LA: Lightning Arrester

Hereinafter, a DC train load power control circuit of the present invention will be described with reference to the accompanying drawings.

First, the DC train load power control circuit of the present invention has a feature of simplifying the configuration of the control circuit by removing the feeder disconnector which is overlapped with the high speed DC circuit breaker for the feeder.

That is, by designing the rack in / rack out structure so that the high speed DC circuit breaker for the feeder can be completely separated from the converter as needed, the anode wire and the vehicle in the rack out state. Since the fault circuit including the circuit is electrically disconnected anyway, power is not supplied to the vehicle. Therefore, even if the feeder disconnector, which is connected in series to the conventional feeder DC circuit breaker, is removed, no safety problem occurs.

3 is a configuration diagram of a DC train load power control circuit according to a preferred embodiment of the present invention, the same reference numerals are used for the same components as in FIG.

As shown in FIG. 3, a high-speed DC circuit breaker HSCB_R1 and HSCB_R2 connected in series with the output terminals of the first and second rectifiers REC_1 and REC_2 and the first and second rectifiers REC_1 and REC_2. And the first and second disconnectors DS_R1 and DS_R2 connected between the negative electrode 22 connected to the rail 21 and the first and second rectifiers REC_1 and REC_2 and the negative electrode 22. ), An anode line 23 connected to the output terminal of the high speed DC circuit breaker HSCB_R1, HSCB_R2, and a plurality of high speed DC circuit breakers HSCB_F1 for the feeder connected to the anode line 23, HSCB_F2, HSCB_F3, HSCB_F4 When one of the high speed DC circuit breakers for the feeder fails, the output of the high speed DC circuit breakers HSCB_R1 and HSCB_R2 is selectively applied to the vehicle using the bypass disconnectors DS_B1, DS_B2, DS_B3, and DS_B4. High speed DC circuit breaker (HSCB_BY) for bypass feeder and HSCB_F1 (HSCB_F2) (HSCB_F3) (HSCB_F4) for feeder Consists of the branches in the output stage comprises a lightning arrester (LA_1) (LA_2) (LA_3) (LA_4) connected to the ground terminal.

When the load power control circuit of the present invention is used, the flow of power supplied to the vehicle under load passes through the rectifier (REC) → high speed DC circuit breaker (HSCB_R) → high speed DC circuit breaker (HSCB_F) for the feeder. The power supplied to the vehicle through the above flow is again flowed to the rectifier (REC) via the rail 21 → negative electrode 22 → disconnector DS_R.

At this time, if any one of the feeder high-speed DC circuit breaker is broken, the bypass feeder high-speed DC circuit breaker (HSCB_BY) immediately operates so that the power supply to the vehicle is not interrupted.

As an example, when HSCB_F2 breaks down in the high speed DC circuit breaker for feeder, the high speed DC circuit breaker HSCB_BY for bypass feeder operates immediately, and only DS_B2 in the bypass disconnectors DS_B1, DS_B2, DS_B3, and DS_B4. As a result, power is supplied to the vehicle through the rectifier (REC) → high speed DC circuit breaker (HSCB_R) → high speed DC circuit breaker (HSCB_BY) for bypass feeder (DS_B2).

At this time, the faulty high speed DC circuit breaker (HSCB_F2) for the feeder is in a rack out state, so it is completely insulated from the vehicle side, so another breaker is required between the vehicle and the high speed DC circuit breaker for the feeder. There is no.

As described above, the load power control device for DC train of the present invention has the following effects.

First, since the high-speed DC circuit breaker for a feeder in which a failure occurs becomes a rack out state, it is not necessary to install a disconnector between vehicles and the vehicle, and reliability can be improved by reducing the failure rate due to the decrease in the disconnector.

Second, it is possible to reduce the cost according to the circuit configuration by simplifying the configuration of the control circuit more, it is possible to improve the reliability by reducing the failure rate due to the simplified circuit configuration.

Claims (3)

Multiple rectifiers, A plurality of high speed DC circuit breakers serially connected to the output terminal of the rectifier; Negative electrode connected to the rail, A plurality of disconnectors connected between the rectifier and the negative electrode; A positive wire connected to an output terminal of the high speed DC circuit breaker; A high speed DC circuit breaker for a plurality of feeders connected to the anode line; A high speed DC circuit breaker for the bypass feeder for applying the output of the high speed DC circuit breaker to the vehicle when any one of the high speed DC circuit breakers for the feeder fails; And a plurality of lightning arresters branched to output ends of the high speed DC circuit breakers for feeders and connected to ground terminals. 2. The DC train load power control circuit according to claim 1, wherein a bypass disconnector corresponding to the feeder high speed DC circuit breaker is connected to an output terminal of the high speed DC circuit breaker for the bypass feeder. 3. The DC train load power according to claim 2, wherein the disconnector corresponding to the high speed DC circuit breaker for the feeder in which the failure occurs among the bypass disconnectors is operated to supply power to the vehicle through the operated disconnector. Control circuit.