CN2769889Y - Leakage current detecting device for electric locomotive power supply system - Google Patents
Leakage current detecting device for electric locomotive power supply system Download PDFInfo
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- CN2769889Y CN2769889Y CN 200520005571 CN200520005571U CN2769889Y CN 2769889 Y CN2769889 Y CN 2769889Y CN 200520005571 CN200520005571 CN 200520005571 CN 200520005571 U CN200520005571 U CN 200520005571U CN 2769889 Y CN2769889 Y CN 2769889Y
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- leakage current
- current detection
- power supply
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Abstract
The utility model relates to a power supply system detection device, which is used for detecting the leakage current of a power supply system of an electric locomotive. The part between an inverter circuit and a high voltage transformer of the utility model is connected with a leakage current detection circuit for detecting the leakage current existing in the operational process of the electric locomotive, and the conditions of the leakage current is prompted by an early-warning circuit which is connected to the leakage current detection circuit, so that the leakage current condition detection and the fault prompt of the power supply system of the electric locomotive can be achieved effectively and quantificationally in time under the condition that the normal operation of the electric locomotive is not influenced. Therefore, the utility model has the advantages of convenient operation and accurate detection results. Simultaneously, the between the leakage current detection circuit and an output end of the inverter circuit is provided with a pantograph detection circuit which can detect the current state of a pantograph in time, so that device damage resulting from detecting the leakage current in the state of boosting the pantograph is avoided and the leakage current conditions in the power supply system of the electric locomotive can be more accurately judged.
Description
Technical field
The utility model relates to a kind of electric power system pick-up unit, is a kind of electric locomotive power supply system leak current detection device specifically.
Technical background
Existing electric locomotive high voltage supply system is installed in outside the car, long-term infringement through weather extremes such as wind-engaging, sand, rain, snow, be easy to cause the high voltage supply system decreasing insulating, more serious situation can cause the high voltage supply system short circuit, as can not in time finding this fault and handling, then can make locomotive failure expansion even make whole contact net for power supplying paralysis, have a strong impact on the normal order of traffic safety and transportation by railroad, cause very big economic loss to country.
Existing detection electric locomotive high voltage supply system leakage current, generally adopt following two kinds of equipment:
1, by withstand voltage instrument system is applied the voltage that is higher than the normal voltage 2-3 of system times and detects, and have following shortcoming with this method:
A. this test method has certain destructiveness to system;
B. can only newly make or overhaul after locomotive on test;
C. can only qualitatively judge.
2, vehicle-mounted insulation detects, and has following shortcoming:
A. can only qualitatively judge high voltage supply system ground connection;
B. it is many to test required staff;
C. voltage transformer (VT) there is certain destructiveness.
The utility model content
The utility model has overcome above-mentioned shortcoming, and a kind of electric locomotive power supply system leak current detection device accurate, visual result that detects is provided.
The technical scheme in the invention for solving the technical problem is: a kind of electric locomotive power supply system leak current detection device, comprise an inverter circuit, also comprise a leakage current detection circuit that is used to detect the electric locomotive leakage current, an early warning circuit and a power circuit of the steady operation power supply being provided for the each several part circuit that the leakage current situation is carried out early warning, the DC110V power supply links to each other with described inverter circuit, and be connected to described power circuit simultaneously, the output of inverter circuit and described high-voltage mutual inductor, leakage current detection circuit links to each other simultaneously, described leakage current detection circuit also connects described early warning circuit simultaneously, and described power circuit connects leakage current detection circuit respectively, early warning circuit.
Also can comprise a pantograph testing circuit that is used to detect the current pantograph state of electric locomotive in the described device, be connected between the output terminal and leakage current detection circuit of described inverter circuit, and link to each other with described power circuit simultaneously.
Described warning circuit can comprise that one is used for the display circuit of display working condition and leakage current situation, a voice warning circuit that is used for by voice suggestion leakage current situation.
Described leakage current detection circuit can be socketed in output terminal with described inverter circuit by a current transformer.
Described device also can comprise a power-supplying circuit that is used to cut off supply line, and described power-supplying circuit directly links to each other with described leakage current detection circuit.
Described leakage current detection circuit can comprise a main control chip that is used for whole device is totally controlled, two integrated transporting dischargings and peripheral circuit thereof.
Described power circuit can comprise a DC modular converter, regulator block and peripheral circuit thereof.
Described pantograph testing circuit can comprise a rectifier bridge, stabilivolt, photoelectrical coupler and peripheral circuit thereof.
Described voice warning circuit can be made of voice recording and playback ic, audio frequency power amplifier chip and loudspeaker and peripheral circuit.
In the described leakage current detection circuit, the output of described current transformer can be through a resistance, link to each other with the in-phase input end of first order amplifier behind the diode, while electric capacity, an electrochemical capacitor, another resistance, an end ground connection after second diode is in parallel, the other end also links to each other with the in-phase input end of described first order amplifier, the negative pole of electrochemical capacitor wherein, the positive terminal of second diode is an earth terminal, the inverting input of described first order integrated transporting discharging is connected with the output terminal of the voltage follower that is made of second level integrated transporting discharging, the output terminal of first order integrated transporting discharging links to each other with main control chip through the 3rd resistance, links to each other through the inverting input of a variable resistor with described second level integrated transporting discharging simultaneously.
The utility model is used for detecting the leakage current detection circuit that there is leakage current in the electric locomotive operational process by be connected with one between inverter circuit and high tension instrument transformer, and by being connected the early warning circuit prompting leakage current situation on the described leakage current detection circuit, can be implemented under the situation that does not influence the normal operation of electric locomotive, in time, effectively, quantitatively the leakage current situation of electric locomotive power supply system is detected with fault and point out, easy to operate, testing result is accurate, simultaneously, between the output terminal and leakage current detection circuit of described inverter circuit, be provided with a pantograph testing circuit, can in time detect current pantograph state, judge the leakage current situation in the electric locomotive power supply system more accurately.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model
Fig. 2 is circuit theory diagrams of the present utility model firsts
Fig. 3 is a circuit theory diagrams second portion of the present utility model
Embodiment
Be example with electric locomotive 25kV system below, elaborate technology contents of the present utility model.As shown in Figure 1, the utility model is made of inverter circuit, high-voltage mutual inductor, power circuit, leakage current detection circuit, pantograph testing circuit, voice warning circuit and display circuit.Wherein, the DC110V power supply links to each other with described inverter circuit, and be connected to described power circuit simultaneously, the output of inverter circuit links to each other with described high-voltage mutual inductor, company's pantograph testing circuit, and link to each other with leakage current detection circuit by mutual inductor L3 simultaneously, described leakage current detection circuit also connects described voice warning circuit and display circuit simultaneously, described power circuit connects leakage current detection circuit, pantograph testing circuit, voice warning circuit and display circuit respectively, and stable+5V working power is provided for the element in the each part mentioned above circuit.
Shown in Fig. 2,3, described inverter circuit comprises a copped wave controller U10, inverter controller U11, capacitor C 24～C29, a field effect transistor Q3～Q7, an inductance L 1 and a diode D12.The DC110V power supply is the filtering circuit through being made of capacitor C 24, C25, C26, L1 successively, the chopper circuit that constitutes by copped wave controller U10, field effect transistor Q3, the filtering once more that C27, C28, C29 constitute, the inverter control circuit that inverter controller U11 and field effect transistor Q4～Q7 constitutes links to each other with described high-voltage mutual inductor T2 with transformer T1 afterwards.This partial circuit becomes 50HZ, 100V pure sine wave AC power supplies with locomotive DC 110V power inverter, is connected to T2 limit of described high-voltage mutual inductor again, produces 25kV high-voltage power supply simulation locomotive work state on former limit.The circuit mutual inductor L3 of described leakage current detection circuit is socketed between described transformer T1 and the high-voltage mutual inductor T2.
Power circuit comprises a DC modular converter U3, regulator block U4 and peripheral circuit thereof, link to each other with the input end of described DC modular converter U3 after the resistance R 5 that described DC110V power supply process is connected in parallel, the filtering of C15, C16, output terminal has obtained stable DC12V, be connected to the input end of regulator block U4 again after the filtering through resistance R 2, capacitor C 3, C17, output terminal obtains a stable DC5V again after the filtering of capacitor C 7, C18, and supplies with element in the described each several part circuit as working power.
Described leakage current detection circuit mainly comprises two integrated transporting discharging U1A, U5A, main control chip U2 and peripheral circuit thereof, the output of described current transformer L3 is through resistance R 1, in-phase input end with amplifier U1A behind the diode D1 links to each other, while capacitor C 1, electrochemical capacitor C9, resistance R 3, an end ground connection after diode D5 is in parallel, the other end wherein negative pole of electrochemical capacitor C9 that also links to each other with the in-phase input end of described amplifier U1A, the positive terminal of diode D5 is an earth terminal, the inverting input of described integrated transporting discharging U1A is connected with the output terminal of the voltage follower that is made of integrated transporting discharging U5A, the output terminal of integrated transporting discharging U1A links to each other with the RAN1 end of main control chip U2 through resistance R 4, links to each other with the inverting input of described integrated transporting discharging U5A through variable resistor R10 simultaneously.The RA3 end of described main control chip U2 links to each other with the base stage of a triode Q1 through a resistance R 51, the grounded emitter of described triode Q1, collector is through linking to each other with+12V power end behind the coil of relay K 1, two normally opened contacts of described relay K 1 link to each other with the control end of described copped wave controller U10, inverter controller U11 respectively, and the two ends of coil are parallel with a sustained diode 51 simultaneously; The RA4 of described main control chip U2, RA5, RA6 end are respectively by same circuit structure difference pilot relay K2, K8, K9, the normally opened contact of described relay K 2, K4 is connected between transformer T1 and the high-voltage mutual inductor T2, is connected in parallel between transformer T1 and the high-voltage mutual inductor T2 behind the normally opened contact of described relay K 3 and two self check resistance R 41, the R42.
Described pantograph testing circuit comprises the rectifier bridge BRIDGE1, stabilivolt D10, the photoelectrical coupler U6 that are made of four diodes, the output of transformer T1 in the described inverter circuit is connected to the input end of described rectifier bridge BRIDGE1 simultaneously, after the filtering of output terminal through capacitor C 22, resistance R 6, in parallel with resistance R 16, capacitor C 8 successively, again through being connected to the input end of photoelectrical coupler U6 behind the stabilivolt D10, the output terminal collector is connected to+the 5V power end, and emitter is connected to the RA2 end of main control chip U2.
Described display circuit mainly is made of display driver chip U9, four LED charactron D11 and eight buffer resistance R23～R30, three control end RB0, RB1, the RB2 of described display driver chip U9 link to each other with the corresponding end of described main control chip U2 respectively, and eight output drive ends link to each other with the control end of described charactron D11 through behind described eight resistance R 23～R30 respectively.
Described voice warning circuit is made of voice recording and playback ic U7, audio frequency power amplifier chip U8 and loudspeaker LS1 and peripheral circuit.Eight data terminals of described voice recording and playback ic U7 link to each other with eight analog to digital conversion output terminals A DD1～ADD8 of described main control chip respectively, control end RB7 links to each other with the corresponding end of described main control chip, serial output terminal SP+ links to each other with the corresponding input end of described audio frequency power amplifier chip U8, and the output terminal of described audio frequency power amplifier chip U8 connects and driving loudspeaker LS1.
The course of work of present embodiment is as follows: detect to open when entering detected state when described device enters, power supply DC110V enters this device, one the tunnel enters inverter circuit, after boosting through the copped wave of wherein chopper circuit, again through D12, C27, C28, the filtering of C29, forming stable DC150V sends into by Q1, Q2, Q3, the full bridge inverter that Q4 constitutes, form AC100V through transformer T1, another road enters power circuit, through DC modular converter U3, DC110V is become stable DC12V, become DC5V through regulator block U4 then, the chip of supplying with in main control chip and other each circuit provides stable working power, main control chip U2 starts working, and, making relay K 4 adhesives by described main control chip U2 driving Q9 conducting, the loop is connected.When described pantograph testing circuit detects, as pantograph when rising arciform attitude, there is the 25kV high-tension electricity on the former limit of high voltage potential transformer T2, then time limit can produce the AC100V alternating current, through rectifier bridge BRIDGE1 rectification, again through C22, R6, R16, C8 filtering, and after the stabilivolt D10 voltage stabilizing, make photoelectrical coupler U6 conducting, then export RA2 and hold into high level, main control chip U2 detects the RA2 high level, drive display circuit, make the LED charactron show " Err ", drive the voice warning circuit detected state simultaneously, and forbid rising bow; As pantograph when falling arciform attitude, then the output terminal RA2 of pantograph testing circuit is a low level, main control chip U2 pilot relay K3 discharges, device prepares to carry out self check, main control chip U2 is by driving triode Q1 pilot relay K1 closure, promptly to copped wave controller U10, inverter controller U11 sends instruction, inverter circuit is started working, simultaneously by driving triode Q2 respectively, Q8 and difference pilot relay K2, K3 connects and detects resistance R 41, R42, main control chip U2 detects power supply and self duty by this part loop, normal as self check, then voice warning circuit prompting " self check is normal ", at this moment main control chip U2 pilot relay K3 discharges, disconnect the self check loop, and make relay K 4 adhesives, by driving inverter controller U11, through transformer T1, inductance L 2 produces AC100V, the 50Hz pure sine wave, produce the 25kV high-tension electricity through high voltage potential transformer T2 again, current transformer L3 senses current signal, send into main control chip U2 through the filtering of leakage current detection circuit with after amplifying, signal after main control chip U2 will be amplified by leakage current detection circuit carries out the A/D conversion, pass through calculation process then, drive display circuit and show leakage current value, drive voice warning circuit prompting leakage current value simultaneously.When leakage current during greater than 10mA, main control chip U2 release relay K2, K4 cut off load, drive display circuit simultaneously and show that the 25kV leakage current is " 9999 "; , drive display circuit and demonstrate the 25kV leakage current value during greater than 1mA as the high voltage supply system leakage current, voice warning circuit is pointed out out the value of leakage current overshoot, and " forbid rising bow, please overhaul "; , drive display circuit and demonstrate the 25kV leakage current value less than 1mA as the high voltage supply system leakage current, voice suggestion " insulation is good, can rise bow ".
Claims (9)
1, a kind of electric locomotive power supply system leak current detection device, comprise an inverter circuit, a high-voltage mutual inductor, it is characterized in that: also comprise a leakage current detection circuit that is used to detect the electric locomotive leakage current, an early warning circuit and a power circuit of the steady operation power supply being provided for the each several part circuit that the leakage current situation is carried out early warning, the DC110V power supply links to each other with described inverter circuit, and be connected to described power circuit simultaneously, the output of inverter circuit and described high-voltage mutual inductor, leakage current detection circuit links to each other simultaneously, described leakage current detection circuit also connects described early warning circuit simultaneously, and described power circuit connects leakage current detection circuit respectively, early warning circuit.
2, electric locomotive power supply system leak current detection device according to claim 1, it is characterized in that: also comprise a pantograph testing circuit that is used to detect the current pantograph state of electric locomotive in the described device, be connected between the output terminal and leakage current detection circuit of described inverter circuit, and link to each other with described power circuit simultaneously.
3, electric locomotive power supply system leak current detection device according to claim 1 and 2 is characterized in that: described warning circuit comprises that one is used for the display circuit of display working condition and leakage current situation, a voice warning circuit that is used for by voice suggestion leakage current situation.
4, electric locomotive power supply system leak current detection device according to claim 1 and 2 is characterized in that: described leakage current detection circuit is socketed in output terminal with described inverter circuit by a current transformer.
5, electric locomotive power supply system leak current detection device according to claim 4 is characterized in that: described leakage current detection circuit comprises a main control chip that is used for whole device is totally controlled, two integrated transporting dischargings and peripheral circuit thereof.
6, electric locomotive power supply system leak current detection device according to claim 1 and 2 is characterized in that: described power circuit comprises a DC modular converter, regulator block and peripheral circuit thereof.
7, electric locomotive power supply system leak current detection device according to claim 2 is characterized in that: described pantograph testing circuit comprises a rectifier bridge, stabilivolt, photoelectrical coupler and peripheral circuit thereof.
8, electric locomotive power supply system leak current detection device according to claim 3 is characterized in that: described voice warning circuit is made of voice recording and playback ic, audio frequency power amplifier chip and loudspeaker and peripheral circuit.
9, electric locomotive power supply system leak current detection device according to claim 5, it is characterized in that: in the described leakage current detection circuit, the output of described current transformer is through a resistance, link to each other with the in-phase input end of first order amplifier behind the diode, while electric capacity, an electrochemical capacitor, another resistance, an end ground connection after second diode is in parallel, the other end also links to each other with the in-phase input end of described first order amplifier, the negative pole of electrochemical capacitor wherein, the positive terminal of second diode is an earth terminal, the inverting input of described first order integrated transporting discharging is connected with the output terminal of the voltage follower that is made of second level integrated transporting discharging, the output terminal of first order integrated transporting discharging links to each other with main control chip through the 3rd resistance, links to each other through the inverting input of a variable resistor with described second level integrated transporting discharging simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520005571 CN2769889Y (en) | 2005-03-09 | 2005-03-09 | Leakage current detecting device for electric locomotive power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520005571 CN2769889Y (en) | 2005-03-09 | 2005-03-09 | Leakage current detecting device for electric locomotive power supply system |
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| Publication Number | Publication Date |
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| CN2769889Y true CN2769889Y (en) | 2006-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520005571 Expired - Fee Related CN2769889Y (en) | 2005-03-09 | 2005-03-09 | Leakage current detecting device for electric locomotive power supply system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488662B (en) * | 2008-01-16 | 2012-06-20 | 李尔公司 | System and method for fault isolation and leakage current detection |
| CN104029599A (en) * | 2014-05-19 | 2014-09-10 | 南京南车浦镇城轨车辆有限责任公司 | Protection device for automatic and rapid pantograph dropping of subway vehicle pantograph at low pressure |
| CN106597080A (en) * | 2016-12-31 | 2017-04-26 | 中车太原机车车辆有限公司 | Traction motor fixed shunt resistor current monitoring device and method for railroad locomotive |
| CN109228871A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Power supply system of train and its detection of electrical leakage recovery device, method and train |
| CN111060736A (en) * | 2019-12-13 | 2020-04-24 | 西安锐驰电器有限公司 | Vehicle-based live detection method for power transformation system |
| CN113071322A (en) * | 2021-04-08 | 2021-07-06 | 中车青岛四方机车车辆股份有限公司 | Control method and device of alternating current leakage detection device and railway vehicle |
-
2005
- 2005-03-09 CN CN 200520005571 patent/CN2769889Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488662B (en) * | 2008-01-16 | 2012-06-20 | 李尔公司 | System and method for fault isolation and leakage current detection |
| CN104029599A (en) * | 2014-05-19 | 2014-09-10 | 南京南车浦镇城轨车辆有限责任公司 | Protection device for automatic and rapid pantograph dropping of subway vehicle pantograph at low pressure |
| CN106597080A (en) * | 2016-12-31 | 2017-04-26 | 中车太原机车车辆有限公司 | Traction motor fixed shunt resistor current monitoring device and method for railroad locomotive |
| CN109228871A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Power supply system of train and its detection of electrical leakage recovery device, method and train |
| CN109228871B (en) * | 2017-07-10 | 2020-08-07 | 比亚迪股份有限公司 | Train power supply system, leakage detection and recovery device and method thereof, and train |
| CN111060736A (en) * | 2019-12-13 | 2020-04-24 | 西安锐驰电器有限公司 | Vehicle-based live detection method for power transformation system |
| CN113071322A (en) * | 2021-04-08 | 2021-07-06 | 中车青岛四方机车车辆股份有限公司 | Control method and device of alternating current leakage detection device and railway vehicle |
| CN113071322B (en) * | 2021-04-08 | 2022-04-26 | 中车青岛四方机车车辆股份有限公司 | Control method and device of alternating current leakage detection device and railway vehicle |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |