CN110797839A - Leakage protection method for urban rail transit power supply system - Google Patents
Leakage protection method for urban rail transit power supply system Download PDFInfo
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- CN110797839A CN110797839A CN201911080080.5A CN201911080080A CN110797839A CN 110797839 A CN110797839 A CN 110797839A CN 201911080080 A CN201911080080 A CN 201911080080A CN 110797839 A CN110797839 A CN 110797839A
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- power supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
Abstract
The invention provides an electric leakage protection method of an urban rail transit power supply system, which comprises the following steps: a voltage judgment protection device is arranged between a power supply negative electrode and a grounding wire of each power supply area of the power supply system; the voltage judgment protection device is used for monitoring the voltage between the power supply cathode and the power connection wire, sending alarm information when the voltage exceeds a preset value, and tripping the current power supply area after preset time; detecting the current magnitude of a positive bus and a negative bus corresponding to the positive bus which are used for connecting up and down in each power supply area in real time; obtaining a difference current value between the current of the positive bus and the current of the corresponding negative bus according to the current; and when the alarm information is received, judging the power supply area with electric leakage according to the difference current value. The method can accurately and quickly locate the leakage area, and is convenient to search and repair; meanwhile, the normal power supply area can be quickly recovered, so that the operation of other areas is not influenced.
Description
Technical Field
The invention relates to the technical field of rail transit transportation, in particular to a leakage protection method of an urban rail transit power supply system.
Background
At present, compared with the traditional subway power supply mode, the direct-current traction power supply system for the light rail and magnetic suspension rail traffic has the advantage that the negative electrode does not flow back through the traveling rail, but additionally flows back through the negative electrode rail. The light rail runs through the rubber wheels, the magnetic suspension train runs in a suspension mode, so that the light rail and the magnetic suspension train are relatively insulated from the ground, and the electric leakage condition is difficult to avoid along with the increase of time. At present, aiming at the situation, when the urban rail transit line has a ground leakage fault, the protection device is judged in a voltage mode, so that the whole line tripping is caused, the operation is influenced, and meanwhile, the troubleshooting work is greatly disturbed because the fault section cannot be determined. At present, a related leakage protection method which can quickly position a leakage interval and is convenient to overhaul is lacked.
Disclosure of Invention
Based on the leakage protection method, when leakage faults occur in different areas, the leakage areas can be accurately and quickly positioned, and the leakage protection method is convenient to search and repair; meanwhile, the operation of a power supply area is quickly recovered, so that the operation of the train can be quickly recovered when the train meets the electric leakage condition.
In order to achieve the purpose, the invention adopts the following technical scheme:
a leakage protection method of an urban rail transit power supply system comprises the following steps:
a voltage judgment protection device is arranged between a power supply negative electrode and a grounding wire of each power supply area of the power supply system; the voltage judgment protection device is used for monitoring the voltage between the power supply cathode and the power connection wire, sending alarm information when the voltage exceeds a preset value, and tripping the current power supply area after preset time;
detecting the current magnitude of a positive bus and a negative bus corresponding to the positive bus which are used for connecting up and down in each power supply area in real time; obtaining a difference current value between the current of the positive bus and the current of the corresponding negative bus according to the current;
and when the alarm information is received, judging the power supply area with electric leakage according to the difference current value.
The method is further improved by the following steps:
when the alarm information is received, the step of judging the power supply area with electric leakage according to the difference current value further comprises the following steps:
when the alarm information is received, obtaining the positive and negative distribution conditions of the difference current value of each power supply area according to the difference current value;
in all power supply regions, when all the differential current values in the region are positive or all negative, the region is a leakage region.
In the above method, preferably, the step of, when all the differential current values in the region are positive or negative in all the power supply regions, determining that the region is a leakage region includes:
in all power supply areas, all differential current values in the areas are positive, and the areas are leakage areas without train operation;
when all the differential current values in the area are negative, the area is a leakage area when the train operates.
In the above method, preferably, after the step of determining the power supply region where the leakage occurs according to the difference current value, the method further includes:
and according to the obtained specific power supply area with electric leakage, carrying out trip operation on the corresponding area within preset time.
In the above method, preferably, after the step of determining the power supply region where the leakage occurs according to the difference current value, the method further includes:
and according to the obtained specific power supply area with the electric leakage, after the power supply area is tripped all the line, the normal power supply of other power supply areas except the power supply area with the electric leakage is recovered.
In the above method, preferably, before the step of detecting in real time the magnitude of current of the positive bus and the negative bus in each power supply area, the method further includes:
arranging a differential current sensor on a positive bus for connecting up and down and a negative bus corresponding to the positive bus; the differential current sensor is used for detecting a differential current value between the current of the positive bus and the current of the corresponding negative bus in real time.
In the above method, preferably, the voltage determination protection device includes:
a voltage relay and a protective resistor.
In the above method, preferably, the protection resistor is an adjustable resistor of 1 Ω to 10 Ω.
According to the scheme, the leakage protection method of the urban rail transit power supply system is different from the existing voltage protection mode. The current magnitude of the positive bus and the negative bus corresponding to the positive bus, which are used for connecting the uplink and the downlink in each power supply area, is detected, so that a difference current value between the current of the positive bus and the current of the negative bus corresponding to the positive bus is obtained, and the area condition can be judged according to the difference current value. When no electric leakage occurs, the differential current value is 0, when electric leakage occurs, if the train is not in operation, the fault area differential current value is positive, and if the train is in operation, the fault area differential current value is negative. By judging the magnitude and polarity of the differential current of all the power supply stations, only the power supply stations (fault sections) on two sides of the fault point have the same differential current polarity, and the power supply stations of the non-fault sections have different differential current (through current) polarities, so that the section of the fault point can be quickly determined.
The voltage judgment protection device arranged between the power supply negative electrode and the grounding wire can judge whether the area leaks electricity or not by detecting the voltage magnitude under the condition of electricity leakage, so that the area is tripped to protect under the condition of electricity leakage.
The fault area can be quickly positioned under the double protection and detection, the trip protection is pertinently carried out, the leakage area can be independently tripped in preset time, and the normal operation of other areas without leakage can be quickly recovered after the full-line trip. The influence of the electric leakage condition on the normal operation of the vehicle can be reduced, and meanwhile, the repairing work can be carried out on the fault section more quickly.
Drawings
FIG. 1 is a schematic diagram of a voltage-type ground leakage arrangement;
FIG. 2 is a schematic current flow diagram of a power supply system during no train traction according to an embodiment of the present invention;
fig. 3 is a schematic current flow diagram of a power supply system during train traction according to an embodiment of the invention.
Detailed Description
The technical solution of the present invention is further described with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3, an embodiment of the present invention will first describe a system for implementing the method.
The earth leakage protection devices on the market at present are all voltage detection type protection, and when an earth leakage fault occurs, all protection devices on the line can detect the existence of the leakage voltage (the voltages of parallel circuits are equal), so that the whole line can be tripped, and the fault section of the leakage cannot be determined.
The system of the embodiment introduces the judgment of the differential current, so that the leakage area can be accurately determined, but when a vehicle brakes on the line, the value of the differential current cannot be determined, so that the device of the embodiment introduces the judgment of the polarity of the differential current and the judgment of the polarity of the differential current in adjacent power supply stations, the misjudgment under the condition of vehicle braking is effectively solved, and the specific section of the fault point can be accurately distinguished. The specific principle is as follows:
A. voltage type earth leakage protection device principle description
See fig. 1. Fig. 1 is a schematic diagram of a voltage-type ground leakage device, and a small rectangle represents a ground leakage protection device, 64D for short, of each power supply station. When the positive pole of the track is short-circuited to the ground, a voltage can be generated between the ground and the negative pole, and when the voltage reaches a certain value, the 64D equipment can send out an alarm signal and simultaneously send out a tripping signal of a 211-214 circuit breaker.
Because all 64D devices are connected in parallel on the negative pole, their detected drain voltages are equal (parallel circuit voltages are equal), so the utility breakers on all zones will open, resulting in a full line trip.
B. Differential current flow direction (no vehicle or vehicle in traction state)
See fig. 2. Fig. 2 is a schematic diagram of current flow directions of a power supply system during no train traction in the embodiment of the invention, wherein the flow directions of positive electrode-to-ground current, ground-to-negative electrode current and crossed positive electrode current flow directions of adjacent power supply stations are shown in fig. 2, and an ellipse represents a differential current sensor.
Under the condition that no vehicle exists on the track, when a leakage fault occurs, the positive current passes through the differential current sensor, the negative current returns to the grounding point (D1/D2/D3 grounding point) of the 64D device through the ground (D point), and then flows back to the negative electrode through the 64D device, the positive current is far larger than the negative current without passing through the differential current sensor, and the polarity of the differential current is positive.
C. Differential current flow direction description (in case of vehicle braking)
See fig. 3. Fig. 3 is a schematic current flow diagram of a power supply system during train traction according to an embodiment of the invention. The flow direction of the positive electrode-to-ground current, the flow direction of the ground-to-negative electrode current and the flow direction of the positive electrode current from the adjacent power supply station through are shown in fig. 3, and the ellipse represents the differential current sensor.
In the case of braking of a rail vehicle, when a leakage fault occurs, part of the positive current flows to the ground through a leakage point and then flows back to the 64D device, and part of the positive current flows to the negative electrode through the energy feeding and absorbing device. At this time, since the negative current I _2212 ═ I _64D1+ I _ enable 1 (or I _2214 ═ I _64D2+ I _ enable 2) is greater than the positive current, the differential current polarity is negative.
D. Description of logic decisions
By integrating the situations, the difference current magnitude and polarity of all the power supply stations are judged, only the power supply stations (fault sections) on two sides of the fault point have the same difference current polarity, and the power supply stations in the non-fault sections have different difference current (through current) polarities, so that the section of the fault point can be quickly determined, the circuit breaker in the fault section is tripped, and the normal operation of vehicles in other sections cannot be influenced.
Meanwhile, it is preferable that the differential current may be detected by a differential current sensor. The current difference of the positive bus and the negative bus can be detected simultaneously, and the detection is more accurate.
E. Description of the System
The whole grounding leakage protection device mainly comprises a voltage relay, a main control board, a differential current sensor and the like.
2.1 description of protection principle
2.1.1 Main Loop
The anti-reflux diode, the voltage relay, the protective resistor and the like are connected between the ground and the negative electrode, when a circuit is grounded or leaks electricity, the voltage relay acts, the action signal sends logic judgment to immediately protect the tripping action or delay and protect all the tripping actions, an early warning signal is sent under the condition of a certain voltage value, the tripping action is delayed and an alarm signal is sent after a preset protection value is reached, and the tripping action can be immediately protected if the voltage far exceeds the protection value. Thus, the power supply area can be well protected while the specific leakage area is rapidly searched. And the power supply can be rapidly checked and recovered after the leakage area is found.
According to the scheme, the leakage protection method of the urban rail transit power supply system is different from the existing voltage protection mode. The current magnitude of the positive bus and the negative bus corresponding to the positive bus, which are used for connecting the uplink and the downlink in each power supply area, is detected, so that a difference current value between the current of the positive bus and the current of the negative bus corresponding to the positive bus is obtained, and the area condition can be judged according to the difference current value. When no electric leakage occurs, the differential current value is 0, when electric leakage occurs, if the train is not in operation, the fault area differential current value is positive, and if the train is in operation, the fault area differential current value is negative. By judging the magnitude and polarity of the differential current of all the power supply stations, only the power supply stations (fault sections) on two sides of the fault point have the same differential current polarity, and the power supply stations of the non-fault sections have different differential current (through current) polarities, so that the section of the fault point can be quickly determined.
The voltage judgment protection device arranged between the power supply negative electrode and the grounding wire can judge whether the area leaks electricity or not by detecting the voltage magnitude under the condition of electricity leakage, so that the area is tripped to protect under the condition of electricity leakage.
The fault area can be quickly positioned under the double protection and detection, the trip protection is pertinently carried out, the leakage area can be independently tripped in preset time, and the normal operation of other areas without leakage can be quickly recovered after the full-line trip. The influence of the electric leakage condition on the normal operation of the vehicle can be reduced, and meanwhile, the repairing work can be carried out on the fault section more quickly.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. An electric leakage protection method of an urban rail transit power supply system is characterized by comprising the following steps:
a voltage judgment protection device is arranged between a power supply negative electrode and a grounding wire of each power supply area of the power supply system; the voltage judgment protection device is used for monitoring the voltage between the power supply cathode and the power connection wire, sending alarm information when the voltage exceeds a preset value, and tripping the current power supply area after preset time;
detecting the current magnitude of a positive bus and a negative bus corresponding to the positive bus which are used for connecting up and down in each power supply area in real time; obtaining a difference current value between the current of the positive bus and the current of the corresponding negative bus according to the current;
and when the alarm information is received, judging the power supply area with electric leakage according to the difference current value.
2. The leakage protection method of the urban rail transit power supply system according to claim 1, wherein the step of judging the power supply area where leakage occurs according to the differential current value upon receiving the alarm information further comprises:
when the alarm information is received, obtaining the positive and negative distribution conditions of the difference current value of each power supply area according to the difference current value;
in all power supply regions, when all the differential current values in the region are positive or all negative, the region is a leakage region.
3. The leakage protection method for the urban rail transit power supply system according to claim 2, wherein the step of determining that the power supply area is a leakage area when all the differential current values in the power supply area are positive or negative comprises:
in all power supply areas, all differential current values in the areas are positive, and the areas are leakage areas without train operation;
when all the differential current values in the area are negative, the area is a leakage area when the train operates.
4. The leakage protection method for the urban rail transit power supply system according to claim 1, wherein after the step of determining the power supply region where leakage occurs according to the differential current value, the method further comprises:
and according to the obtained specific power supply area with electric leakage, carrying out trip operation on the corresponding area within preset time.
5. The leakage protection method for the urban rail transit power supply system according to claim 1, wherein after the step of determining the power supply region where leakage occurs according to the differential current value, the method further comprises:
and according to the obtained specific power supply area with the electric leakage, after the power supply area is tripped all the line, the normal power supply of other power supply areas except the power supply area with the electric leakage is recovered.
6. The leakage protection method for the urban rail transit power supply system according to claim 1, wherein before the step of detecting in real time the magnitude of current flowing in each power supply area between the positive bus and the negative bus corresponding to the positive bus, the method further comprises:
arranging a differential current sensor on a positive bus for connecting up and down and a negative bus corresponding to the positive bus; the differential current sensor is used for detecting a differential current value between the current of the positive bus and the current of the corresponding negative bus in real time.
7. The leakage protection method of the urban rail transit power supply system according to claim 1, wherein the voltage judgment protection device comprises:
a voltage relay and a protective resistor.
8. The leakage protection method of the urban rail transit power supply system according to claim 7, wherein the protection resistor is an adjustable resistor of 1 Ω -10 Ω.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911080080.5A CN110797839B (en) | 2019-11-07 | 2019-11-07 | Leakage protection method for urban rail transit power supply system |
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| CN201911080080.5A CN110797839B (en) | 2019-11-07 | 2019-11-07 | Leakage protection method for urban rail transit power supply system |
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| CN110797839B CN110797839B (en) | 2021-05-07 |
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2019
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