CN114563733A - Alternating current leakage detection system and method supporting power supply mode conversion and vehicle - Google Patents
Alternating current leakage detection system and method supporting power supply mode conversion and vehicle Download PDFInfo
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- CN114563733A CN114563733A CN202210196868.8A CN202210196868A CN114563733A CN 114563733 A CN114563733 A CN 114563733A CN 202210196868 A CN202210196868 A CN 202210196868A CN 114563733 A CN114563733 A CN 114563733A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
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- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Emergency Protection Circuit Devices (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides an alternating current leakage detection system supporting power supply mode conversion, a method and a vehicle, wherein the system comprises an alternating current insulation detection device, a leakage current contactor, a leakage detection resistor, a circuit breaker and a controller, wherein the circuit breaker, the leakage current contactor and an alternating current leakage point detection device are sequentially connected in series and are connected between a neutral line and the vehicle; the leakage detection resistor is connected with the leakage current contactor in parallel; the alternating-current insulation detection device is used for detecting a vehicle leakage current value and sending an early warning/alarming signal to the controller, and the controller is used for controlling the leakage current contactor to be closed or opened according to the vehicle state so that the vehicle auxiliary power supply mode is a TT mode or an IT power supply mode; according to the invention, an isolation transformer is not required to be added, so that the design cost of the vehicle is reduced; when an electric leakage fault occurs, the power supply mode is automatically switched into an IT power supply mode, a fault load power supply does not need to be cut off, the influence on the operation order is reduced, and the vehicle availability is improved.
Description
Technical Field
The invention belongs to the technical field of alternating current leakage detection, and particularly relates to an alternating current leakage detection system and method supporting power supply mode conversion and a vehicle.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The auxiliary power supply system of the rail transit vehicle usually adopts TT or IT two power supply modes, the TT power supply mode can realize the AC220V power supply without adding an isolation transformer, and the TT power supply mode can realize the AC220V power supply without adding an isolation transformer. In the TT power supply mode, when the load leaks electricity, because the loop impedance is small, the continuous increase of the current can cause equipment burning loss and even vehicle ignition, a fault unit power supply must be immediately cut off, the vehicle power loss affects the driving order; in the IT power supply mode, when the load leaks electricity, the loop impedance is large, the leakage current is small, the power supply can be kept running without being cut off, the availability is high, but the continuous alarm of the leakage detection device is ensured. The conventional leakage detection system needs to be configured according to a power supply mode or an isolation transformer is added to realize power supply, so that the input equipment cost is high.
Disclosure of Invention
The invention aims to solve the problems and provides an alternating current leakage detection system and method supporting power supply mode conversion and a vehicle, and the system and method ensure that an auxiliary system works in a TT mode when the vehicle normally works, an isolation transformer is not required to be added, and the design cost of the vehicle is reduced; when the leakage fault occurs, the power supply mode is automatically switched to the IT power supply mode, the fault load power supply does not need to be cut off, the influence on the operation order is reduced, and the vehicle availability is improved.
According to some embodiments, the invention adopts the following technical scheme:
an alternating current leakage detection system supporting power supply mode conversion comprises an alternating current insulation detection device, a leakage current contactor, a leakage detection resistor, a circuit breaker and a controller, wherein:
the circuit breaker, the leakage current contactor and the alternating current leakage point detection device are sequentially connected in series and connected between the neutral line and the vehicle;
the leakage detection resistor is connected with the leakage current contactor in parallel;
the alternating-current insulation detection device is used for detecting a vehicle leakage current value and sending an early warning/alarming signal to the controller, and the controller is used for controlling the leakage current contactor to be closed or opened according to the vehicle state so that the vehicle auxiliary power supply mode is a TT mode or an IT power supply mode;
the leakage detection resistor is used for limiting leakage current within a certain range in an IT power supply mode.
As an alternative embodiment, the ac insulation detection device is configured to recover a drain contactor state, and different set current thresholds are configured according to the drain contactor state.
In an alternative embodiment, the alternating current insulation detection device is used for sending an early warning signal to the controller when the detected leakage current exceeds a first set current threshold value and sending an alarm signal to the controller when the detected leakage current exceeds a second set current threshold value in the TT mode.
In an alternative embodiment, the ac insulation detection device is configured to send an alarm signal to the controller when the detected leakage current exceeds a third set current threshold in the IT mode.
As an alternative embodiment, the controller is configured to display the warning information through the display device when the warning signal is received, so as to prompt the staff for detection.
As an alternative embodiment, the controller is configured to control the leakage current contactor to be opened when the alarm signal is received, so that the vehicle auxiliary power supply mode is changed from the TT mode to the IT power supply mode.
In an alternative embodiment, the controller belongs to a vehicle network and communicates with a ground server through a communication network.
An alternating current leakage detection method supporting power supply mode conversion comprises the following steps:
the method comprises the steps that a vehicle state is obtained, and when a vehicle normally works, a leakage current contactor is controlled to be closed, so that the auxiliary power supply mode of the vehicle works in a TT mode;
the alternating current insulation detection device detects the leakage current value of the vehicle, compares the leakage current value with the corresponding set current threshold value, generates a corresponding early warning/alarm signal and sends the signal to the controller;
when the alternating-current insulation detection device generates an alarm signal, the leakage current contactor is controlled to be disconnected, and the vehicle leakage current returns to a neutral line through the leakage detection resistor, so that the vehicle auxiliary power supply mode is converted into an IT power supply mode;
and detecting the current leakage value of the leaky vehicle at the moment, comparing the current leakage value with the corresponding set current threshold value, generating a corresponding alarm signal and sending the alarm signal to the controller.
According to different auxiliary power supply modes of the vehicle, the single-phase insulation resistance value of the vehicle is automatically calculated and recorded based on the collected corresponding leakage current value.
A vehicle comprises or is connected with the alternating current leakage detection system supporting power supply mode conversion.
Compared with the prior art, the invention has the beneficial effects that:
the auxiliary power supply system can ensure that the auxiliary power supply system works in the TT mode when the vehicle works normally, an isolation transformer is not required to be added, and the design cost of the vehicle can be reduced;
when the leakage fault occurs, the power supply mode is automatically switched to the IT power supply mode, the fault load power supply does not need to be cut off, the influence on the operation order is reduced, and the vehicle availability is improved.
The alternating current leakage detection device can automatically identify the working mode (TT or IT) of the auxiliary system and calculate the impedance value of the line with poor insulation.
When the leakage current in the TT mode exceeds the corresponding threshold value, early warning or alarming is carried out, meanwhile, the leakage current contactor is controlled to be disconnected in time, the vehicle leakage current returns to the N line through the current limiting resistor, and the auxiliary power supply mode of the vehicle is converted from the TT mode to the IT power supply mode. At the moment, after the vehicle leakage current is limited by the current limiting resistor, the leakage current value is very small, and the equipment damage and the vehicle fire of the vehicle cannot be caused.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a system architecture according to at least one embodiment of the present invention;
FIG. 2 is a JDK state extraction diagram of at least one embodiment of the present invention;
FIG. 3 is a schematic diagram of leakage in TT mode of at least one embodiment of the present invention;
FIG. 4 is a schematic diagram of leakage current in IT mode according to at least one embodiment of the present disclosure.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The first embodiment is as follows:
the utility model provides a high-speed EMUs alternating current electric leakage detection system based on TT changes to IT power supply mode, realizes that the supplementary power supply mode of high-speed EMUs still possesses the leakage current detection function after changing to IT by TT, has guaranteed the operation safety of vehicle on the one hand, on the other hand can carry out real time monitoring to vehicle leakage current and insulation resistance.
As shown in fig. 1, the system includes an ac insulation detection device, a leakage current contactor JDK, a leakage detection resistor R, a circuit breaker JDN, and a vehicle network. Alternating current leakage point detection device detects the vehicle current leakage value and sends early warning and alarm signal for vehicle network, and vehicle network controls JDK and realizes alarm signal's bullet screen suggestion according to the vehicle state, and R resistance can be with the restriction of leakage current in certain extent.
When the vehicle normally works, the JDK is closed, and the auxiliary power supply system is in a TT working mode. The ac insulation detection device measures a leakage current of the vehicle. When the insulation of the auxiliary bus of the vehicle is normal, the bus has large resistance to the PE of the vehicle body, and the leakage current is very small; when the bus insulation is abnormal, the bus resistance to the vehicle body is reduced, and the leakage current ILeakage netContinuously increases when exceeding the set value I of the alternating current leakage detection devicePreparation ofOr INewspaperAnd when the alternating current leakage detection device is used, the alternating current leakage detection device sends out early warning and alarm signals to a vehicle network.
When the vehicle network receives the early warning signal, the early warning information is displayed through the display screen, and the driver and passengers of the vehicle are prompted to return to the warehouse for detection.
When the vehicle network receives the alarm signal, the vehicle network displays alarm information through a display screen on one hand, the JDK is controlled to be disconnected on the other hand, vehicle leakage current returns to an N line through a resistor R, and the auxiliary power supply mode of the vehicle is converted from the TT mode to the IT power supply mode. At the moment, after the vehicle leakage current is limited by the current limiting resistor R, the leakage current value is very small, and the equipment damage and the vehicle fire of the vehicle cannot be caused.
In order to realize detection and alarm of leakage current in the IT mode, the ac leakage detecting device still needs to recover the JDK state to the ac insulation detecting device, as shown in fig. 2. When the alternating-current insulation detection device detects that the JDK is closed, the auxiliary power supply system is in a TT working mode, and the electric leakage alarm threshold is ITT(ii) a When the JDK disconnection is detected, the auxiliary power supply system is in an IT working mode, and the electric leakage alarm threshold value is IIT(ii) a Therefore, leakage current alarm can be realized under TT and IT working modes, and the number of leakage currents can be recorded in real timeThe value is obtained.
In TT operation mode, as shown in fig. 3, since the insulation resistance is much smaller than the three-phase ground capacitive reactance,
Ileakage netIs approximately I5Insulation resistance:
R＝UN/Ileakage net(1)
UNThe rated voltage of single phase is generally 220V; I.C. ALeakage netMay be measured by a leakage detection device.
In the IT operating mode, the leakage current detection loop is as shown in fig. 4, the U, V, W, N line-to-ground capacitances are substantially the same, and are approximately C (which can be determined by the current vehicle test), JDK is off, and the R1 resistor is connected in series to the leakage current detection circuit, and is calculated by circuit analysis:
UNthe single-phase rated voltage is generally 220V; i isLeakage netMay be measured by a leakage detection device; r1Selecting a current-limiting resistor for design, wherein the current-limiting resistor is generally 3-10K; and C can be obtained by measurement of an LCR tester on the current vehicle and is solidified into calculation software.
The insulation detection device confirms a power supply mode (TT or IT) of the auxiliary power supply system by acquiring the JDK state, and when the insulation detection device works in the TT mode, the insulation detection device calculates an insulation resistance value by adopting a formula (1); when the device works in the IT mode, calculating the insulation resistance value by adopting a formula (2);
and the insulation detection calculation result is indicated on a display interface of the insulation detection device, or the insulation resistance value is displayed on a network monitoring screen through communication with a network, or even sent to a ground server through a vehicle body communication wireless network.
Example two:
a rail transit vehicle is provided with the detection system of the first embodiment.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. An alternating current leakage detection system supporting power supply mode conversion is characterized in that: including exchanging insulation detection device, leakage current contactor, electric leakage detection resistance, circuit breaker and controller, wherein:
the circuit breaker, the leakage current contactor and the alternating current leakage point detection device are sequentially connected in series and connected between the neutral line and the vehicle;
the leakage detection resistor is connected with the leakage current contactor in parallel;
the alternating-current insulation detection device is used for detecting a vehicle leakage current value and sending an early warning/alarming signal to the controller, and the controller is used for controlling the leakage current contactor to be closed or opened according to the vehicle state so that the vehicle auxiliary power supply mode is a TT mode or an IT power supply mode;
the leakage detection resistor is used for limiting leakage current within a certain range in an IT power supply mode.
2. The ac leakage detection system supporting power supply mode switching according to claim 1, wherein: the alternating current insulation detection device is configured to recover a leakage current contactor state, and different set current thresholds are configured according to the leakage current contactor state.
3. An ac leakage detection system supporting power supply mode switching as claimed in claim 1 or 2, wherein: the alternating current insulation detection device is used for sending out an early warning signal to the controller when the detected leakage current exceeds a first set current threshold value in the TT mode, and sending out an alarm signal to the controller when the detected leakage current exceeds a second set current threshold value.
4. An ac leakage detection system supporting power supply mode switching as claimed in claim 1 or 2, wherein: and the alternating current insulation detection device is used for sending an alarm signal to the controller when the detected leakage current exceeds a third set current threshold value in an IT mode.
5. The ac leakage detection system supporting power supply mode switching according to claim 1, wherein: the controller is configured to display the warning information through the display device to prompt a worker to perform detection when the warning signal is received.
6. The ac leakage detection system supporting power supply mode switching according to claim 1, wherein: the controller is configured to control the leakage current contactor to be opened when the alarm signal is received, so that the auxiliary power supply mode of the vehicle is changed from the TT mode to the IT power supply mode.
7. The ac leakage detection system supporting power supply mode switching according to claim 1, wherein: the controller belongs to a vehicle network and is communicated with a ground server through a communication network.
8. An alternating current leakage detection method supporting power supply mode conversion is characterized in that: the method comprises the following steps:
the method comprises the steps that the state of a vehicle is obtained, and when the vehicle works normally, a leakage current contactor is controlled to be closed, so that the auxiliary power supply mode of the vehicle works in a TT mode;
the alternating current insulation detection device detects the leakage current value of the vehicle, compares the leakage current value with the corresponding set current threshold value, generates a corresponding early warning/alarm signal and sends the signal to the controller;
when the alternating-current insulation detection device generates an alarm signal, the leakage current contactor is controlled to be disconnected, and the vehicle leakage current returns to a neutral line through the leakage detection resistor, so that the vehicle auxiliary power supply mode is converted into an IT power supply mode;
and detecting the current leakage value of the leaky vehicle at the moment, comparing the current leakage value with the corresponding set current threshold value, generating a corresponding alarm signal and sending the alarm signal to the controller.
9. The method as claimed in claim 8, wherein the method comprises the following steps: and automatically calculating the single-phase insulation resistance value of the vehicle and recording the single-phase insulation resistance value based on the collected corresponding leakage current values according to different auxiliary power supply modes of the vehicle.
10. A vehicle, characterized by: an alternating current leakage detection system supporting power supply mode conversion according to any one of claims 1 to 7 is included or connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210196868.8A CN114563733A (en) | 2022-03-01 | 2022-03-01 | Alternating current leakage detection system and method supporting power supply mode conversion and vehicle |
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| CN202210196868.8A CN114563733A (en) | 2022-03-01 | 2022-03-01 | Alternating current leakage detection system and method supporting power supply mode conversion and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7480445B1 (en) | 2022-12-21 | 2024-05-10 | 一般財団法人関東電気保安協会 | Insulation monitoring device |
| JP7480444B1 (en) | 2022-12-21 | 2024-05-10 | 一般財団法人関東電気保安協会 | Insulation monitoring system and insulation monitoring method |
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2022
- 2022-03-01 CN CN202210196868.8A patent/CN114563733A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7480445B1 (en) | 2022-12-21 | 2024-05-10 | 一般財団法人関東電気保安協会 | Insulation monitoring device |
| JP7480444B1 (en) | 2022-12-21 | 2024-05-10 | 一般財団法人関東電気保安協会 | Insulation monitoring system and insulation monitoring method |
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