CN110161364A - AC transmission electric power locomotive major loop ground fault detection method - Google Patents
AC transmission electric power locomotive major loop ground fault detection method Download PDFInfo
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- 230000003137 locomotive effect Effects 0.000 title claims abstract description 17
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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
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Abstract
The present invention relates to AC transmission electric power locomotive Earth Fault Detections, specially AC transmission electric power locomotive major loop ground fault detection method.It solves to build defect and deficiency existing for analog circuit progress major loop ground breakdown judge by high-speed hardware sample circuit or using hardware.The voltage signal U1 between node between the DC side both end voltage signal U of real-time detection four-quadrant rectification module of the present invention and the DC side positive terminal and resistance R2 and resistance R3 of four-quadrant rectification module, and the situation of change according to signal difference 0.5*U-U1 within a certain period of time, realize the detection of AC transmission electric power locomotive traction convertor major loop ground, can be realized intermediate dc side it is positive and negative ground connection and exchange the judgement for flanking earth fault, and it can be further in four-quadrant side A phase terminal, four-quadrant side X phase terminal, inverter side U phase, judge which is mutually grounded in inverter side V phase and inverter side W phase.
Description
Technical field
The present invention relates to AC transmission electric power locomotive Earth Fault Detection, specially AC transmission electric power locomotive major loop is connect
Earth fault detection method.
Background technique
In recent years, as China railways continue to develop, electric locomotive has become main force's vehicle of railway transportation, this is just right
More stringent requirements are proposed for its safe and reliable operation, and the detection and protection of major loop ground failure are that Electric Locomotive circuit is protected
One important content of shield.Locomotive due to vibration, friction, pollution, cable aging etc., will cause a certain circuit during transportation
Ground fault occurs for link, if carrying out malfunction elimination processing not in time, may cause the serious consequence of short circuit.
AC transmission electric power locomotive major loop topology is given in Fig. 1, includes four macroplates, pre-charge module, four in figure
Quadrant rectification module, copped wave module, inverter module, wherein pre-charge module includes pre-charge contactor K11, pre-charge resistance
R0, main contactor K1, four-quadrant rectification module include the list of input current monitoring device A1, g1, g2, g3, g4 switching tube composition
Phase full-bridge circuit, copped wave module include chopping switching tube g5, copped wave resistance R4, backward dioded D1, chopper current monitoring device
A2, inverter module include the three-phase inverting circuit of g6, g7, g8, g9, g10, g11 switching tube composition, and M is threephase asynchronous,
C1 and C3 is DC side Support Capacitor, and R1 is slow play resistance, and U is DC bus-bar voltage monitoring device, and resistance R2 resistance value is equal to R3,
The both ends that resistance R2 and R3 are connected on DC loop constitute ground resistance monitoring circuit, and C2 simultaneously is used to absorb spuious at the both ends R2
Inductance uses the voltage signal at the both ends R2 of ground voltage detection device U1 detection as the signal source of breakdown judge.
The prior art builds analog circuit progress major loop ground event by high-speed hardware sample circuit or using hardware
Barrier judgement, there are following defect or deficiencies: firstly, increasing the design cost of detection circuit;Secondly, only direct current is distinguished in judgement
Flank with exchange flank ground, cannot distinguish between specifically which of input side or outlet side and be mutually grounded.
Summary of the invention
The present invention solves to build analog circuit progress major loop ground by high-speed hardware sample circuit or using hardware
Defect and deficiency existing for breakdown judge provide a kind of AC transmission electric power locomotive major loop ground fault detection method.
The present invention is achieved by the following technical scheme: AC transmission electric power locomotive major loop ground fault detection side
Method, major loop include the four-quadrant rectification module being made of switching tube g1-g4, the inverter module being made of switching tube g6-g11,
The ac input end of four-quadrant rectification module is zero line A and zero line side X;It will be whole as one after resistance R2, resistance R3 series connection
Body is connected in parallel on the DC side both ends of four-quadrant rectification module, and wherein the resistance value of resistance R2 and resistance R3 are equal, resistance R2 and resistance
Node ground connection between R3, and in one voltage sensor U1 of the two sides of resistance R2 parallel connection, in the straight of four-quadrant rectification module
Flow side both ends shunt voltage sensor U;The DC side both end voltage signal U and four-quadrant of real-time detection four-quadrant rectification module are whole
The voltage signal U1 between node between the DC side positive terminal and resistance R2 and resistance R3 of flow module, and calculate 0.5*U with
Voltage difference si 0.5*U-U1 between U1;
Difference signal 0.5*U-U1 is always more than within a certain period of time equal to -0.1*U and is less than or equal to 0.1*U, and judgement is led back
Ground fault does not occur for road;
Difference signal 0.5*U-U1 is always more than 0.4*U within a certain period of time, is determining the DC side of four-quadrant rectification module just
Extreme ground fault;
Difference signal 0.5*U-U1 is always less than -0.4*U within a certain period of time, determines the DC side cathode of four-quadrant rectification module
Terminate earth fault;
Difference signal 0.5*U-U1 is being less than -0.4*U and is being greater than between 0.4*U alternately change with impulse form within a certain period of time
Change, is then determined as that exchange flanks earth fault;
The further control wave of detection (a upper left side for four-quadrant rectification module) switching tube g1, and with the control of switching tube g1
The phase of pulse signal is compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determines that four-quadrant rectifies mould
The zero line A ground fault of block;
The further control wave of detection (four-quadrant rectification module upper right) switching tube g3, and with the control of switching tube g3
The phase of pulse signal is compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determines that four-quadrant rectifies mould
The zero line side X ground fault of block;
The further control wave of detection (a upper left side for inverter module) switching tube g6, and believed with the control pulse of switching tube g6
Number phase be compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determine inverter side U phase ground fault;
The further control wave of detection (inverter module upper in) switching tube g8, and with the pulse signal phase of switching tube g8
Position is compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determines inverter side V phase ground fault;
The further control wave of detection (inverter module upper right) switching tube g10, and with the pulse signal of switching tube g10
Phase be compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determine inverter side W phase ground fault.
The DC side both end voltage signal U of real-time detection four-quadrant rectification module of the present invention and four-quadrant rectification module it is straight
The voltage signal U1 between the node between side positive terminal and resistance R2 and resistance R3 is flowed, and is existed according to signal difference 0.5*U-U1
Situation of change in certain time is realized the detection of AC transmission electric power locomotive traction convertor major loop ground, be can be realized
Between DC side it is positive and negative ground connection and exchange the judgement for flanking earth fault.And it after being determined as that exchange flanks earth fault, further examines
The pulse signal for surveying four-quadrant side and inverter side, with the control wave of four-quadrant side and inverter side and signal difference 0.5*U-
The phase of U1 is compared, can four-quadrant side A phase terminal, four-quadrant side X phase terminal, inverter side U phase, inverter side V phase and
Judge which is mutually grounded in inverter side W phase.The present invention realizes simply, efficiently solves the prior art and samples by high-speed hardware
Circuit builds the deficiency that analog circuit carries out ground connection judgement using hardware, can be applied in engineering practice.
Detailed description of the invention
Fig. 1 is the circuit diagram of AC transmission electric power locomotive major loop of the present invention.
Specific embodiment
AC transmission electric power locomotive major loop ground fault detection method, major loop include being made of switching tube g1-g4
Four-quadrant rectification module, the inverter module being made of switching tube g6-g11, the ac input end of four-quadrant rectification module are firewire
Hold A and zero line side X;The DC side two of four-quadrant rectification module will be connected in parallel on as a whole after resistance R2, resistance R3 series connection
End, wherein the resistance value of resistance R2 and resistance R3 are equal, the node ground connection between resistance R2 and resistance R3, and the two of resistance R2
One voltage sensor U1 of side parallel connection, in the DC side both ends shunt voltage sensor U of four-quadrant rectification module;Real-time detection four
The DC side both end voltage signal U of quadrant rectification module and the DC side positive terminal of four-quadrant rectification module and resistance R2 and resistance
Voltage signal U1 between node between R3, and calculate the voltage difference si 0.5*U-U1 between 0.5*U and U1;
Difference signal 0.5*U-U1 is always more than within a certain period of time equal to -0.1*U and is less than or equal to 0.1*U, and judgement is led back
Ground fault does not occur for road;
Difference signal 0.5*U-U1 is always more than 0.4*U within a certain period of time, is determining the DC side of four-quadrant rectification module just
Extreme ground fault;
Difference signal 0.5*U-U1 is always less than -0.4*U within a certain period of time, determines the DC side cathode of four-quadrant rectification module
Terminate earth fault;
Difference signal 0.5*U-U1 is being less than -0.4*U and is being greater than between 0.4*U alternately change with impulse form within a certain period of time
Change, is then determined as that exchange flanks earth fault;
The further control wave of detection (a upper left side for four-quadrant rectification module) switching tube g1, and with the control of switching tube g1
The phase of pulse signal is compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determines that four-quadrant rectifies mould
The zero line A ground fault of block;
The further control wave of detection (four-quadrant rectification module upper right) switching tube g3, and with the control of switching tube g3
The phase of pulse signal is compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determines that four-quadrant rectifies mould
The zero line side X ground fault of block;
The further control wave of detection (a upper left side for inverter module) switching tube g6, and believed with the control pulse of switching tube g6
Number phase be compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determine inverter side U phase ground fault;
The further control wave of detection (inverter module upper in) switching tube g8, and with the pulse signal phase of switching tube g8
Position is compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determines inverter side V phase ground fault;
The further control wave of detection (inverter module upper right) switching tube g10, and with the pulse signal of switching tube g10
Phase be compared with the phase of difference signal 0.5*U-U1, if phase coincidence, determine inverter side W phase ground fault.
When it is implemented, difference signal 0.5*U-U1 is judged within a certain period of time, refer within 200 milliseconds have
In body embodiment, the control pulse period of detection switch pipe is 50 microseconds.
Claims (1)
1. a kind of AC transmission electric power locomotive major loop ground fault detection method, major loop includes being made of switching tube g1-g4
Four-quadrant rectification module, the inverter module being made of switching tube g6-g11, the ac input end of four-quadrant rectification module is fire
Line end A and zero line side X;The DC side of four-quadrant rectification module will be connected in parallel on as a whole after resistance R2, resistance R3 series connection
Both ends, wherein the resistance value of resistance R2 and resistance R3 are equal, the node ground connection between resistance R2 and resistance R3, and resistance R2's
One voltage sensor U1 of two sides parallel connection, in the DC side both ends shunt voltage sensor U of four-quadrant rectification module;Its feature exists
In the DC side both end voltage signal U of real-time detection four-quadrant rectification module and the DC side positive terminal of four-quadrant rectification module
Voltage signal U1 between node between resistance R2 and resistance R3, and calculate the voltage difference si between 0.5*U and U1
0.5*U-U1;
Difference signal 0.5*U-U1 is always more than within a certain period of time equal to -0.1*U and is less than or equal to 0.1*U, and judgement is led back
Ground fault does not occur for road;
Difference signal 0.5*U-U1 is always more than 0.4*U within a certain period of time, is determining the DC side of four-quadrant rectification module just
Extreme ground fault;
Difference signal 0.5*U-U1 is always less than -0.4*U within a certain period of time, determines the DC side cathode of four-quadrant rectification module
Terminate earth fault;
Difference signal 0.5*U-U1 is being less than -0.4*U and is being greater than between 0.4*U alternately change with impulse form within a certain period of time
Change, is then determined as that exchange flanks earth fault;
The control wave of further detection switch pipe g1, and believed with the phase of the control wave of switching tube g1 and difference
The phase of number 0.5*U-U1 is compared, if phase coincidence, determines the zero line A ground fault of four-quadrant rectification module;
The control wave of further detection switch pipe g3, and believed with the phase of the control wave of switching tube g3 and difference
The phase of number 0.5*U-U1 is compared, if phase coincidence, determines the zero line side X ground fault of four-quadrant rectification module;
The control wave of further detection switch pipe g6, and believed with the phase of the control wave of switching tube g6 and difference
The phase of number 0.5*U-U1 is compared, if phase coincidence, determines inverter side U phase ground fault;
The control wave of further detection switch pipe g8, and with the pulse signal phase of switching tube g8 and difference signal 0.5*
The phase of U-U1 is compared, if phase coincidence, determines inverter side V phase ground fault;
The control wave of further detection switch pipe g10, and with the phase and difference signal of the pulse signal of switching tube g10
The phase of 0.5*U-U1 is compared, if phase coincidence, determines inverter side W phase ground fault.
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Cited By (4)
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CN111766534A (en) * | 2020-06-07 | 2020-10-13 | 中车永济电机有限公司 | Traction converter ground fault detection method and device |
CN112731192A (en) * | 2020-12-14 | 2021-04-30 | 中车永济电机有限公司 | Protection method and test verification method for active power of locomotive traction converter |
CN114002615A (en) * | 2020-07-28 | 2022-02-01 | 株洲中车时代电气股份有限公司 | Method and device for diagnosing converter ground fault |
CN117970183A (en) * | 2024-03-29 | 2024-05-03 | 湖南大学 | Traction transmission system main loop ground fault diagnosis method |
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