KR101359414B1 - The integrated single phase power supply system for electric railway - Google Patents

Abstract

The present invention relates to a power supply system for supplying power to an electric railway and more specifically, to an integrated single-phase power supply system for an electric railway for converting three-phase main power into two-phase main power of a T-phase and an M-phase by a Scott transformer, converting one phase among the T-phase or the M-phase converted into the two-phase into the other single phase, integrating the converted single-phase power with existing single-phase power, and supplying the integrated single-phase power to an electric railway track. The integrated single-phase power supply system for an electric railway for converting three-phase main power into two-phase main power of a T-phase and an M-phase by a Scott transformer, converting one phase among the T-phase or the M-phase converted into the two-phase into the other single phase, and supplying the integrated single-phase power to an electric railway track comprises a first transformer and a second transformer which convert a voltage of input power into a predetermined voltage value and are connected to a T-phase power track and an M-phase power track, respectively; a first sensor and a second sensor which measure a current value and a voltage value of each phase for the T-phase and the M-phase, respectively; a single-phase power converter which converts and outputs one phase among the M-phase or the T-phase into the other single phase for supplying power to the electric railway track; a controller which controls the single-phase conversion operation of the single-phase power converter by receiving signals of the first sensor and the second sensor; and a control power unit which supplies power to the controller. [Reference numerals] (AA) T phase; (BB) M phase; (CC) First sensor unit; (DD) First transformer; (EE) First power breaker; (FF) First switch; (GG) DC converter unit; (HH) Inverter unit; (II) Second switch; (JJ) Second power breaker; (KK) Second transformer; (LL) Control unit; (MM) Control power unit; (NN) Conversion unit relay; (OO) Second sensor unit; (PP,QQ) Breaker; (RR) Line breaker

Description

The Integrated Single Phase Power Supply System for Electric Railway

The present invention relates to a power supply system for supplying power to an electric railway, and more particularly, a three-phase main power source is converted into two phases of a T phase and an M phase by a Scott transformer, and the T phase or The present invention relates to an electric railway single-phase integrated feeding system for converting any one phase of the M phase into another single phase, integrating the converted single phase power with the existing single phase power, and then supplying the integrated single phase power to the electric railway line.

Conventional power devices can operate well even when the voltage, current and frequency fluctuate in a relatively wide range. However, since many power devices used in recent industrial sites have many electronic devices for controlling, variations in frequency and voltage etc. There is an increasing number of cases that cause a malfunction by reacting very sensitively to, and accordingly, power compensation problems in various power devices or power systems are gradually increasing.

This problem of power compensation is no exception for electric railways. In the electric power feeding system of the conventional electric railway, as shown in FIG. 1, the three-phase main power is converted into two-phase power of M phase and T phase through a Scott transformer, and the converted M-phase and T-phase power is converted into an electric railway line. Each line section to be configured is supplied separately, and the separation line of the M-phase and T-phase meets each other, there is an insulation section according to the phase change of the power supplied. As such, the phase of power supplied to each section is different, resulting in voltage unbalance due to the load difference in each section. The vehicle load of electric railways continues to increase due to shortening the driving interval of each vehicle, speeding up, and increasing traction. As a result, more current flows in the feeder line, which causes a large voltage drop.The voltage drop not only impedes the normal operation of the electric railway, but also causes voltage unbalance on the three-phase power supply. Since the voltage of one phase is lowered and the voltage of another phase is increased to cause damage by low voltage and high voltage at the same time, damage occurs not only in terms of energy consumption but also in terms of device life.

As a solution to this problem, voltage compensation has been performed by installing a power capacitor, but this is a mechanical switching method, which causes a slow response time and a transient phenomenon. A thyristor is used as a high-speed switch and is a passive element capacitor. Inverter type reactive power compensator such as static var compensator (SVC) or STATCOM (STATIC compensator) has been developed as a power compensator that quickly and accurately compensates reactive power of power system by connecting to the reactor and reactor. In this case, since the DC capacitor for energy storage must be provided separately, there is a problem in that the increase of the equipment and the manufacturing cost rise, and there is a problem that the voltage unbalance due to the supply of the line section of the two-phase power source cannot be solved fundamentally.

In addition, due to the existence of an insulation section at the point where the M-phase and T-phase separation lines meet each other, in the process of passing through the insulation section during operation of the electric railway vehicle, the notch of the Pantograph is turned on. There is inconvenience in driving operation such as On), Off, etc., and it increases the driver's fatigue while driving, which acts as a risk factor for safe operation of electric railway vehicle, and the electric railway when entering and passing the insulation section. Decelerating and accelerating the vehicle has a problem of significantly increasing the power consumption and running time.

Accordingly, the present invention has been made to solve the above-described problems, in the conventional electric power supply system of the electric railway, voltage drop phenomenon generated by supplying power to each line section by separating the power of each phase of the T phase and M phase and In addition to improving power imbalance,

It is possible to remove the insulation section at the point where the M-phase and T-phase separation lines meet each other, eliminating the difficulty of driving operation in the process of passing the insulation section during the operation of the electric railway vehicle, and all the sections except for the station stop are the same. It allows you to drive electric rail cars at speed, which greatly reduces power consumption and vehicle running time.

In addition, when single-phase power is supplied to the entire line section, when an accident current occurs on the feeder line for each section, it is possible to easily identify the point of occurrence of the accident current so that recovery actions can be promptly performed. It is possible to prevent the occurrence of the second accident due to the propagation of the fault current by quickly disconnecting the feed line adjacent to the point of occurrence of the fault, and even if the fault current break is failed due to the malfunction of the nearest breaker at the point of the fault current occurrence. In the next breaker, it is possible to cut the propagation of accident current quickly so that the feeder line can be operated more stably.

In order to solve the above problems, in one embodiment of the present invention, a three-phase main power source is converted into two phases of a T phase and an M phase by a Scott transformer, and any one phase of the T phase or the M phase converted to the two phases is changed. In an electric railway single phase integrated power feeding system which converts and integrates into another single phase to supply electric railway lines, the input voltage is transformed into a predetermined voltage value and connected to the T phase power line and the M phase power line, respectively. A first transformer unit and a second transformer unit; A first sensor unit and a second sensor unit measuring current and voltage values of respective phases for the T-phase and M-phase power supplies, respectively; Single phase power conversion unit for converting any one phase of the M phase or T phase to another single phase to supply electric power to the electric railway line; A control unit which receives a signal from the first sensor unit and the second sensor unit to control the single phase conversion operation of the single phase power conversion unit; And a control power supply unit for supplying power to the control unit.

In the electric railway single-phase integrated power feeding system of one embodiment of the present invention, the single-phase power conversion unit includes: a first opening / closing switch for opening and closing an input power supply; A DC converter unit converting AC power passing through the first opening / closing switch into DC power; An inverter unit which receives the DC power passing through the DC converter unit, receives an operation signal from the controller, converts the output voltage integrated with the existing single-phase power source into an AC power source, and transmits the converted AC voltage; And a second opening / closing switch for opening and closing the output of the output voltage transmitted from the inverter unit.

Preferably, the first power circuit breaker to block the power of any one of the M phase or T phase input to the single-phase power converter, and the other single-phase power of the M-phase or T-phase through the single-phase power converter And a second power circuit breaker to block the converted single-phase power output from the single-phase power converter to be supplied to the outside. The control unit may be configured to open and close the first power circuit breaker and the second power circuit breaker. To control,

More preferably, by receiving a signal from the first sensor unit and the second sensor unit to determine the occurrence of accidents in the power line of the M phase and T phase, and outputs a determination signal for the occurrence of the accident to the controller And a conversion unit relay for opening and closing the first power breaker and the second power breaker.

More preferably, the communication unit for receiving the output signal of the first sensor unit and the second sensor unit received by the control unit, the output signal output by the control unit to the outside, and transmits to the central control room: Can be.

The apparatus may further include a plurality of line blocking units formed at predetermined intervals in each of the feedline sections between the plurality of substations provided on the feedline line integrally supplied to the single-phase power supply of either T-phase or M-phase. Is configured to, the line breaker, a line breaker for blocking the power supply of the feed line; And a line relay configured to detect an occurrence of an accident current on an adjacent feeder line connected to the line breaker and to open and close the line breaker.

Preferably, the line relay of the line breaker senses the line breaker opening and closing state of the other line breaker respectively provided at the front and the rear of the feed line, and according to the line breaker opening state of the other line breaker. Can open and close the breaker,

More preferably, the line relay of the line breaker may be formed of an impedance relay.

In the electric railway single-phase integrated power supply system according to the present invention, a three-phase main power source is converted into two phases of T and M phases by a Scott transformer, and the other phase of any one of the T phase or M phases converted to the two phases is changed. It converts into single phase of and integrates the converted single phase power with the existing single phase power and supplies the integrated single phase power to the electric railway line.

Through this, it is possible to improve the voltage drop phenomenon and the power unbalance generated by separating the power supply for each line section by separating the power supply of each of the T phase and the M phase in the electric power supply system of the conventional electric railway, According to the phase difference of the phase, the insulation section at the point where the necessary separation line of M phase and T phase meet each other can be omitted, and the operation section in the process of passing the insulation section during the operation of the electric railway vehicle by omitting the insulation section. It is possible to solve the difficulties, and to operate electric railway vehicles at the same speed in all sections except for stop stations, which can increase the safety of electric railway operation and the efficiency of electric power use, and the single phase is fed to all line sections. It is possible to share the substation power capacity installed in all line sections, so that the solution is caused by the increase of load by partial line section. The capacity expansion of the substation can be minimized.

In addition, even when single-phase power is supplied to the entire line section, when an accident current occurs on the feeder line for each section, it is possible to easily identify the point of occurrence of the accident current so that recovery actions can be promptly performed and an accident current can be generated. Quickly cut off the feed line adjacent to the point to prevent the occurrence of secondary accidents due to the propagation of the fault current, and even if the fault current breaker fails due to the malfunction of the nearest breaker at the point of the fault current, the next adjacent breaker It is possible to cut off the propagation of accident current quickly in order to operate the electric feeder line more stably.

1 is a schematic configuration diagram showing a two-phase power supply system of an electric railway using a conventional Scott transformer;
2 is a schematic configuration diagram showing an electric railway single phase integrated power supply system according to the present invention; And
Figure 3 is a schematic configuration diagram showing a plurality of line breakers are provided in the electric railway single-phase integrated power supply system according to the present invention to prevent the spread of accident current propagation.

Hereinafter, embodiments of the present invention in which the above object can be specifically realized will be described with reference to the accompanying drawings. In describing the embodiments, the same names are denoted by the same reference numerals, and further description thereof will be omitted below.

2 is a schematic configuration diagram showing an electric railway single phase integrated power supply system 100 according to the present invention, and as shown in FIG. 2, the electric railway single phase integrated power supply system 100 according to the present invention is largely a Scott transformer. The first power supply unit and the second transformer connected to the T-phase power line and the M-phase power line, respectively, are provided with a power feeding system for converting three-phase main power into two phases of M and T phases to supply electric power to the electric railway. The first sensor unit and the second sensor unit for measuring the current value and the voltage value for each of the power line of each of the T phase and the M phase are provided. A single phase power converter 10 is provided to convert and integrate the other single phase to supply electric power. The single phase power converter 10 receives a signal from the first sensor unit and the second sensor unit. Of Is equipped with a control unit for controlling the conversion operation, the control power supply for supplying power to the control unit is provided.

The Scott transformer converts three-phase main power into two phases of M and T in a normal electric railway power supply system, and supplies power to the power line, wherein the first transformer and the second transformer are respectively provided in the present invention. As the input terminal and the output terminal of the electric railway single-phase integrated power supply system 100 according to the present invention, the voltage of the input power is converted into a predetermined voltage value by being connected to the power lines of the T phase and the M phase, respectively. In an embodiment, as shown in FIG. 2, the first transformer unit outputs the voltage input from the T phase by reducing the voltage to the single phase power converter 10, and the second transformer unit 10 outputs the single phase power converter 10. In step 1), the converted single-phase power source, that is, the converted M-phase power source, is boosted and integrated into the existing single-phase power source, that is, the existing M-phase power source output from the Scott transformer, and is supplied to a feed line of an electric railway.

The first sensor unit and the second sensor unit are connected to the power lines of the T phase and the M phase, respectively, to measure the current value and the voltage value of each phase in real time, and the current value can be measured using a CT (Current Transformer). Voltage value can be measured using PT (Potential Transformer). Through the first sensor unit and the second sensor unit it is possible to monitor the power state of the power line of the T-phase and M-phase.

The single-phase power converter 10 receives power for one of the T-phase or M-phase and converts it into the other phase, and the voltage phase difference so that the converted single-phase power can be integrated with an unconverted existing single-phase power. And so on. Preferably, as shown in Figure 2, the single-phase power conversion unit 10 is passed through the first opening and closing switch and the first opening and closing switch for opening and closing the power supply received by receiving the opening and closing signal of the control unit The DC converter unit converts AC power into DC power, and receives the control signal of the control unit, receives the DC power passing through the DC converter unit, receives the operation signal from the control unit, and converts the phase power into an integrated single phase power source. And an inverter unit for converting and converting the converted single-phase power into AC power, and a second opening / closing switch for opening and closing the output of the output voltage transmitted from the inverter unit by receiving an opening / closing signal of the control unit. The opening and closing operation of the open / close switch and the second open / close switch may be configured to be performed at the same time.

The controller receives a current value and a voltage value for the T phase and the M phase in real time from the first sensor unit and the second sensor unit, respectively, and converts any one phase of the T phase or the M phase to the other single phase. To control the operation of the single-phase power conversion unit 10 to make, as an embodiment, as shown in FIG. 2, the first opening and closing switch to which the T-phase power is input to integrate the T-phase into the M-phase Is opened, and a control signal for phase-converting the T-phase to the M-phase is transmitted to the inverter section of the single-phase power converter 10.

That is, the control unit generates a single voltage that forms 90 ° with the M phase through the 90 ° phase delay filter using the PLL circuit, which is a well-known technique, and then converts the three phase voltage to 90 through Park's conversion. The phase angle is calculated by simulating the voltage on the stationary coordinate with the difference. The reference frequency of the M-phase line voltage is determined using the phase angle calculated using the PLL circuit, and a reference sine wave is output. Thereafter, a predetermined gain value is multiplied by a reference sine wave to form a reference line voltage value for the M-phase power line, and the controller obtains a difference between the formed reference line voltage and the measured line voltage and converts the control signal according to the single-phase power conversion unit ( The inverter unit 10 supplies the effective voltage to the M-phase power line. In this case, the control unit may include a pulse width modulation (PWM) circuit unit to transmit a gate signal according to the voltage value to be compensated to the inverter unit.

In addition, the control power supply unit serves to supply power to the control unit.

Preferably, a first power circuit breaker is disposed between the first transformer unit and the single-phase power converter 10, and a second power circuit breaker is disposed between the second transformer unit and the single-phase power converter 10 and the control unit. By controlling the opening and closing operation of the first power circuit breaker and the second power circuit breaker to cut off the power supply in case of an emergency such as M phase or T phase overvoltage or a line accident, and the first sensor unit The controller receives the signal from the second sensor unit and determines whether there is an accident on the power lines of the M phase and the T phase, and outputs a determination signal for the presence or absence of the accident to the controller. It is to be provided with a relay for opening and closing the.

That is, the relay receives the measured current value and the voltage value from the first sensor part and the second sensor part when the current value of the power line is 1.5 times or more of the rated current or when the voltage value is 80% or less of the rated voltage. The first power circuit breaker and the second power circuit breaker are operated to open the circuit to recognize the accident and protect the line and the power supply system.

In addition, the communication unit (not shown) is provided to receive the output signal received from the first sensor unit and the second sensor unit, and the output signal output by the control unit to the outside to transmit to the central control room electric railway With respect to the power supply system, the operator can monitor the electric railway single-phase integrated power supply system 100 according to the present invention even in the field as well as in a remote place.

Referring to the operation of the electric railway single-phase integrated power supply system 100 according to the present invention in more detail, the Scott transformer of the electric railway power supply system converts the main power supply of three phases of 154kV into two phases of M and T phases of 50kV Supplying power to the line, wherein the first transformer unit and the second transformer unit is connected to a power supply line of T phase and M phase, respectively, as an input terminal and an output terminal of the single phase converter 1, and the first transformer unit is a T phase power source. It is connected to the line and reduces the line voltage of 50kV to a predetermined voltage value and transfers it to the first power circuit breaker, and the first power source in a normal state other than an emergency such as a line accident such as a short circuit occurs in a power line of T phase or M phase. The circuit breaker is maintained in a closed state to energize power to the single-phase power conversion unit 10, and the control unit closes and energizes the first open / close switch and the second open / close switch of the single-phase power conversion unit 10. It is.

The DC converter receiving the reduced power converts AC power into DC power, and the controller which receives the current value and the voltage value of M phase from the second sensor part calculates a phase angle through a PLL circuit. As such, the control unit transmits a control signal for causing the inverter unit to output an output voltage corresponding to the compensation voltage, so that the inverter unit transfers an output voltage having AC power to the second transformer unit through the second power circuit breaker. The second transformer boosts the received voltage to energize the power line of the existing M phase, integrates the converted M phase power with the existing M phase power, and then feeds the power to the electric railway line.

Since there is no insulation section at the point where conventional T-phase and M-phase meet when the power is supplied to a single-phase power supply, there is a problem that the electric line is affected when an accident such as an overcurrent occurs in some lines. In the electric railway single phase integrated power supply system 100 according to the present invention, as shown in FIG. 3, a plurality of lines are blocked at predetermined intervals in each feed line section between a plurality of substations provided on the feed line and supplying single phase power. By providing the part 20, it is possible to quickly cut off the accident line in which an accident current is generated when an accident current is generated in some lines, and the overcurrent generated in the accident line is propagated along a nearby feed line to spread secondary damage. It becomes possible to prevent it.

3 is a schematic configuration diagram showing that a plurality of line breakers 20 are provided in the electric railway single-phase integrated power supply system 100 according to the present invention in order to prevent the propagation of an accident current. The line breaker 20 is a line breaker for disconnecting an accident section on a feed line by blocking the energization of the feed line as shown in FIG. 3, and an accident on an adjacent feed line connected to the line breaker. It may be configured to include a line relay 21 for detecting this when the current is generated and opening and closing the line breaker, the line relay 21 of the line breaker 20, the other is provided in front and rear on the feed line, respectively The line breaker opening and closing state of the line breaker 20 is sensed, and the line breaker of the line breaker 20 can be opened and closed according to the other line breaker opening and closing state.

In addition, the line relay 21 of the line breaker 20 is composed of an impedance relay having an electric current and a voltage as a monitoring element at the same time to determine the occurrence of an accident current by using only one of the current or voltage as a monitoring element. Compared with the conventional relay, it is possible to detect the occurrence of accident current more precisely and accurately.

Determining whether the line breakers of the front and rear line breakers adjacent to the line where the line relay 21 is installed may be opened or closed may be detected through an intercommunication network, but the line according to the impedance value of the accident current that cuts off the line breaker is controlled. The user sets the blocking operation time of the relay 21 step by step according to the line situation in which each line relay 21 is installed, and blocks the line breaker after the operation time of the line breaker according to the impedance value when an accident current occurs. Make it work.

For example, as illustrated in FIG. 3, when an accident current occurs at an accident point, the left and right line 1 relays 21 which are closest to the accident current occurrence point measure the lowest impedance and simultaneously The line is cut off at the earliest operation control time, and at this time, the line relay 21 on the right side of the accident point cuts the line breaker according to the operation control time to prevent the accident current from propagating in the direction of the right line. When the line relay 21 fails to cut off the line breaker due to an error, the next left line relay 21 measures a higher impedance value than the left line line relay 21. The operation control time is also longer than the left line 1 relay 21 and is delayed by the difference of the respective operation control time. By operating time, the left line 2 breaker is controlled to cut off the line, and as a result of the protection cooperation between the left side 1 and 2 line relay 21, the fault current is left 3 line relay 21 It is possible to prevent the radio waves from expanding to the provided line section.

By the above-described configuration, the electric railway single-phase integrated power supply system 100 according to the present invention is a single-phase power source converted by converting any one phase of T phase or M phase converted to two phases into another single phase. Can be integrated with existing unconverted single-phase power, and then the integrated single-phase power can be supplied to the electric railway lines.

Since single-phase power can be supplied to a vehicle of an electric railway, it is possible to improve voltage drop and power unbalance caused by supplying power for each line section by separating the power of each phase of a T-phase and M-phase in a conventional electric power feeding system. It is possible to omit the insulation section at the point where the separation lines of the M-phase and T-phase, which have been necessary according to the phase difference of the power supply conventionally supplied for each section, can be omitted, and the insulation section can be omitted during operation of the electric railway vehicle. It can solve the difficulty of driving operation in the process of passing the section, and can operate the electric railway vehicle at the same speed in all the driving sections except the stop station, thereby increasing the safety of electric railway operation and the efficiency of electric power use. The single phase is fed to all line sections so that the substation power capacity installed in all line sections can be shared. Therefore, it is possible to minimize the power capacity expansion of the substation according to the load increase by the partial line section.

In addition, even when single-phase power is supplied to the entire line section, when an accident current occurs on the feeder line for each section, it is possible to easily identify the point of occurrence of the accident current so that recovery actions can be promptly performed and an accident current can be generated. Quickly cut off the feed line adjacent to the point to prevent the occurrence of secondary accidents due to the propagation of the fault current, and even if the fault current breaker fails due to the malfunction of the nearest breaker at the point of the fault current, the next adjacent breaker In this way, it is possible to block the propagation of accidental current quickly so that the electric railway feed line can be operated more stably.

It is to be understood by those skilled in the art that the present invention may be embodied in many other forms without departing from the spirit and scope of the invention,

Accordingly, the above-described embodiments are to be considered illustrative and not restrictive, and all embodiments within the scope of the appended claims and their equivalents are intended to be included within the scope of the present invention.

1: single phase inverter 10: single phase power converter
20: line breaker 21: line relay
100: Electric Railway Single Phase Integrated Feeding System

Claims (8)

The Scott transformer converts the main power of three phases into two phases of T and M phases, and converts any one of the T phase or M phases converted into two phases into the other single phase to integrate power into an electric railway line. In the electric railway single-phase integrated feeding system to supply,
A first transformer unit and a second transformer unit for converting the voltage of the input power source into a predetermined voltage value and connected to the T-phase power line and the M-phase power line, respectively;
A first sensor unit and a second sensor unit measuring current and voltage values of respective phases for the T-phase and M-phase power supplies, respectively;
Single phase power conversion unit for converting any one phase of the M phase or T phase to another single phase to supply electric power to the electric railway line;
A control unit which receives a signal from the first sensor unit and the second sensor unit to control the single phase conversion operation of the single phase power conversion unit; And
The electric railway single phase integrated power supply system, characterized in that it comprises a; control power supply for supplying power to the control unit.
The method of claim 1,
The single phase power conversion unit,
A first opening and closing switch for opening and closing an input power supply;
A DC converter unit converting AC power passing through the first opening / closing switch into DC power;
An inverter unit receiving the DC power passing through the DC converter unit, receiving an operation signal from the control unit, and converting an output voltage integrated with an existing single-phase power source into an AC power source and transmitting the same; And
And a second opening and closing switch for opening and closing the output of the output voltage transmitted from the inverter unit.
3. The method of claim 2,
A first power circuit breaker which blocks power of any one of an M phase and a T phase from being input to the single phase power converter; And a second power circuit breaker which blocks the single-phase power converted to the other one of the M phase and the T phase through the single phase power conversion unit from being output from the single phase power conversion unit and supplied to the outside. Composed,
The control unit is an electric railway single-phase integrated power supply system, characterized in that for controlling the opening and closing operation of the first power circuit breaker and the second power circuit breaker.
The method of claim 3, wherein
Receiving a signal from the first sensor unit and the second sensor unit to determine whether there is an accident in the power line of the M phase and T phase, and outputs a determination signal for the occurrence of the accident to the controller, the first power circuit breaker And a conversion unit relay configured to open and close the second power circuit breaker.
5. The method of claim 4,
And a communication unit for receiving an output signal of the first sensor unit and the second sensor unit, which are input by the control unit, and an output signal output by the control unit to the outside, and transmitting the received signal to a central control room. Electric railway single-phase integrated feeding system.
6. The method according to any one of claims 1 to 5,
And a plurality of line breakers formed at predetermined intervals in each feedline section between a plurality of substations provided on a feedline line integrated with a single-phase power source of either T-phase or M-phase. Become,

The line blocking unit,
A line breaker to cut off energization of the feed line; And
And a line relay configured to detect an occurrence of an accident current on an adjacent feeder line connected to the line breaker and to open and close the line breaker. 2.
The method according to claim 6,
The line relay of the line breaker,
Electric rail single phase integration, characterized in that for detecting the line breaker opening and closing state of the other line breaker provided on the front and rear on the feed line, and opening and closing the line breaker of the line breaker according to the line breaker open and close state of the other line breaker. Feeding system.
8. The method of claim 7,
The line relay of the line breaker, the electric railway single-phase integrated power supply system, characterized in that formed by an impedance relay (Impedance Relay).

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