CN202524057U - Earth fault protection device of locomotive auxiliary power system and electric locomotive - Google Patents
Earth fault protection device of locomotive auxiliary power system and electric locomotive Download PDFInfo
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- CN202524057U CN202524057U CN2012201326688U CN201220132668U CN202524057U CN 202524057 U CN202524057 U CN 202524057U CN 2012201326688 U CN2012201326688 U CN 2012201326688U CN 201220132668 U CN201220132668 U CN 201220132668U CN 202524057 U CN202524057 U CN 202524057U
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Abstract
The utility model provides an earth fault protection device of a locomotive auxiliary power system and an electric locomotive. The earth fault protection device comprises a control unit, a power supply unit and a load, which are orderly connected with each other. The load is grounded through a grounding circuit. The earth fault protection device also comprises a current transformer, a sampling resistor and a voltage sensor. The primary winding input terminal of the current transformer is connected with the grounding circuit. The sampling resistor is connected with the two ends of the secondary winding output terminal of the current transformer. The voltage sensor is connected with the two ends of the sampling resistor and is used for collecting a voltage across the sampling resistor and outputting a voltage signal as an earth fault signal to the control unit, so that the control unit controls the power supply unit to stop running. The electric locomotive comprises a locomotive body and the above earth fault protection device of the locomotive auxiliary power system. Due to the adoption of the earth fault protection device, as long as an earth fault occurs to a load, the earth fault of the load can be timely detected. Therefore, the safe operation of the auxiliary power system is ensured.
Description
Technical field
The utility model relates to Electrical Control Technology, relates in particular to a kind of locomotive secondary power system earth-fault protection and electric locomotive.
Background technology
In the electric power system of electric locomotive; Comprise main power source system and secondary power system; The main power source system is used for voltage source to the pulling equipment of electric locomotive being provided; Secondary power system is used for voltage source to the assistant load of electric locomotive being provided, and assistant load is often referred to the various blower fans that are arranged in the electric locomotive, oil pump, air compressor, air-conditioning etc.
Mainly comprise DC power supply, control unit, current transformer and transformer etc. in the secondary power system; Control unit is used to generate the control signal to current transformer; Running status with the control current transformer; Current transformer is transformed into three-phase alternating-current supply according to the control signal that control unit generates with DC power supply, and offers assistant load through transformer after with the three-phase alternating-current supply step-down, with the power supply as assistant load.
For making the secondary power system safe operation; In secondary power system, be provided with ground fault protection circuit usually; Existing ground fault protection circuit mainly comprises current-limiting resistance and relay; Current-limiting resistance is series in the ground path between load and the ground, and the coil of relay and this current-limiting resistance constitute current circuit, and the output contact of relay links to each other with control unit.
When assistant load generation earth fault, will there be earth current to flow through in the ground path, this earth current flows through the current circuit of current-limiting resistance and relay coil formation; At this moment; The coil of relay gets electric, and the output contact action of relay produces ground signalling to send control unit to; The control current transformer quit work after control unit received this ground signalling, and whole secondary power system is protected.
Above-mentioned ground fault protection circuit, it is longer to get electric blanking time to output contact action from relay coil, needs the time of hundreds of millisecond usually; If because of assistant load earth fault makes in the ground path electric current bigger, assistant load and current transformer etc. might damage before the protection action is carried out, and therefore cause fault to enlarge; And, because the existence of current-limiting resistance, when slight earth fault takes place in assistant load; The electric current that flows through in the ground path is less, and coil is failure to actuate in the relay, and assistant load continues operation with pending fault; Therefore, fault is further enlarged.
The utility model content
The utility model provides a kind of locomotive secondary power system earth-fault protection and electric locomotive, with timely detection load earth fault, so that power supply unit and load are protected.
First aspect of the utility model provides a kind of locomotive secondary power system earth-fault protection; Comprise the control unit, power supply unit and the load that connect successively; The operating state that said control unit is used to control power supply unit is to drive the operation of said load; And said load is through ground path ground connection, and this earth-fault protection also comprises:
Current transformer, a winding input terminal of said current transformer is connected in the said ground path;
Sampling resistor, said sampling resistor are connected in the secondary winding lead-out terminal two ends of said current transformer;
Voltage sensor is connected in said sampling resistor two ends, is used to gather voltage and output voltage signal on the said sampling resistor to send said control unit to as the earth fault signal, controls said power supply unit for said control unit and quits work.
Aforesaid locomotive secondary power system earth-fault protection wherein, also comprises:
Two voltage stabilizing didoes are parallel to said sampling resistor two ends after two said voltage stabilizing didoe inverse parallels.
Aforesaid locomotive secondary power system earth-fault protection wherein, also comprises:
Filter, the input of said filter links to each other with said ground path, and the output of said filter links to each other with a winding input terminal of said current transformer.
Aforesaid locomotive secondary power system earth-fault protection, wherein, said power supply unit comprises power supply, current transformer and the transformer that connects successively, wherein,
Said control unit links to each other with said current transformer, is used to generate the control signal to said current transformer, with the running status of controlling said current transformer to drive the operation of said load;
Be in series with reactor between said transformer outlet side and the said load, the two ends of said reactor are parallel with electric capacity.
Another aspect of the utility model provides a kind of electric locomotive; Comprise car body; This electric locomotive also comprises the locomotive secondary power system earth-fault protection that the utility model provides, and the power supply unit of said locomotive secondary power system earth-fault protection comprises transformer at least, and the center line of said transformer links to each other with said car body; Said load links to each other with said car body through earth lead, and the center line of said transformer, car body and said earth lead constitute ground path.
In the locomotive secondary power system earth-fault protection that the utility model provides; As long as load generation earth fault produces earth current in ground path, get final product output voltage signal as the earth fault signal; Quit work according to this earth fault signal controlling power supply unit for control unit; Power supply unit no longer provides working power for load, and load is with out of service, so that power supply unit and load are protected.The production process of this earth fault signal does not have the course of action of mechanical part, and just therefore the transmittance process of the signal of telecommunication, can not postpone, and can detect load earth fault timely, can ensure the safe operation of locomotive secondary power system.
Description of drawings
The structural representation of the locomotive secondary power system earth-fault protection that Fig. 1 is provided for the utility model embodiment;
The structural representation of the locomotive secondary power system earth-fault protection that Fig. 2 is provided for another embodiment of the utility model;
The structural representation of the locomotive secondary power system earth-fault protection that Fig. 3 is provided for the another embodiment of the utility model.
Embodiment
The structural representation of the locomotive secondary power system earth-fault protection that Fig. 1 is provided for the utility model embodiment; As shown in Figure 1; This earth-fault protection comprises control unit 10, power supply unit 11 and the load 12 that connects successively; The operating state that said control unit 10 is used to control power supply unit 11 to be driving the operation of load 12, and said load 12 is through ground path ground connection, and this earth-fault protection also comprises current transformer 13, sampling resistor 14 and voltage sensor 15; Wherein, current transformer 13 winding 131 input terminal is connected in the ground path to be measured; Sampling resistor 14 is connected in the secondary winding 132 lead-out terminal two ends of said current transformer 13; Voltage sensor 15 is connected in said sampling resistor 14 two ends; Be used to gather voltage and output voltage signal on the said sampling resistor 14 to send said control unit 10 to as the earth fault signal, quit work for the said power supply unit 11 of said control unit 10 controls.
Current transformer is made up of the iron core and the winding of closure usually, its umber of turn seldom, the secondary winding turn ratio is more.Current transformer is according to electromagnetic induction principle; When a winding has electric current to flow through; Secondary winding will produce induced current, and, can convert the bigger electric current of numerical value into numerical value less current through certain no-load voltage ratio through secondary winding through a winding.
Through the turn ratio of winding of current transformer and secondary winding is set; No-load voltage ratio just; May command flows through the current ratio of winding and secondary winding, is 400/5 current transformer like no-load voltage ratio, can be the electric current through secondary winding 5A to the current transitions through a winding 400A.
The current conversion that will flow through secondary winding in current transformer that act as of sampling resistor becomes voltage, and when a winding of current transformer had electric current to flow through, the secondary winding of current transformer had less induced current to flow through; And sampling resistor is connected in secondary winding lead-out terminal two ends; Sampling resistor and secondary winding form current circuit, will have induced current to flow through on the sampling resistor, therefore; On sampling resistor, produce pressure drop, just voltage.
Voltage sensor can be gathered voltage and the output voltage signal on the sampling resistor; This voltage signal promptly can be used as fault-signal to send control unit to; Control unit quits work according to this earth fault signal may command power supply unit; Power supply unit no longer provides working power for load, and load is with out of service, so that power supply unit and load are protected.
The operation principle of present embodiment locomotive secondary power system earth-fault protection is:
Power supply unit in this device and load can be used as the part in the locomotive secondary power system, and power supply unit generally includes power supply, current transformer and transformer etc., and load can comprise various power consumption equipments, for example, and motor, air-conditioning and fan etc.Current transformer, sampling resistor and voltage sensor constitute ground fault detection circuit.
Load is through ground path ground connection; When load generation earth fault, will have earth current to flow through ground path, and a winding of current transformer is connected in the ground path; Therefore; This earth current winding of can flowing through a time at this moment, will produce less induced current in the secondary winding of current transformer.Because sampling resistor is connected in secondary winding lead-out terminal two ends, sampling resistor and secondary winding form current circuit, will have induced current to flow through on the sampling resistor; Therefore, on sampling resistor, produce pressure drop, just voltage; Utilize voltage sensor to gather voltage and output voltage signal on the sampling resistor; This voltage signal promptly can be used as fault-signal to send control unit to, and control unit quits work according to this earth fault signal may command power supply unit, and power supply unit no longer provides working power for load; Load is with out of service, so that power supply unit and load are protected.
Need to prove that in the present embodiment, the principle that current transformer is set is:
Because the earth current in the ground path to be measured might be very big; Possibly reach tens or the hundreds of ampere; And the receptible various signals of control unit are little electric current or small voltage signal, for example, are the current signal of several amperes or hundreds of milliampere; The voltage signal of several volts or hundreds of millivolt; Therefore, can not directly this earth current signal be offered control unit, and can convert numerical value less current into through certain no-load voltage ratio by the electric current that numerical value is bigger through secondary winding through a winding through current transformer is set; The induced current that makes the secondary winding of flowing through is some/one of a winding earth electric current of flowing through; Therefore, be little electric current through current transformer with the big current conversion in the ground path to be measured, and be fit to the voltage signal that control unit receives to export through the voltage on the voltage sensor sampling resistor.
Can know by technique scheme; In this locomotive secondary power system earth-fault protection; As long as load generation earth fault produces earth current in ground path, get final product output voltage signal as the earth fault signal; Quit work according to this earth fault signal controlling power supply unit for control unit, power supply unit and load are protected.The production process of this earth fault signal does not have the course of action of mechanical part, and just therefore the transmittance process of the signal of telecommunication, can not postpone, and can detect load earth fault timely, can ensure the safe operation of locomotive secondary power system.
The structural representation of the locomotive secondary power system earth-fault protection that Fig. 2 is provided for another embodiment of the utility model; As shown in Figure 2; On the basis of the foregoing description; Further, be parallel to said sampling resistor 14 two ends after also comprising 16, two said voltage stabilizing didoe 16 inverse parallels of two voltage stabilizing didoes in this earth-fault protection.
Voltage stabilizing didoe (being Zener diode again); This kind diode is a kind of very high-resistance semiconductor device that before critical reverse breakdown voltage, all has; On critical breakdown point; Backward resistance is reduced to a very little numerical value, and at this low-resistance region, electric current increase diode voltage then keeps constant in the diode.
Present embodiment promptly utilizes the above-mentioned characteristic of voltage stabilizing didoe, and the parallel voltage-stabilizing diode at the sampling resistor two ends, the earth current on flowing through winding of current transformer are during for very big impulse current; The mutual inductance electric current that produces on the secondary winding in current transformer also will be bigger; At this moment, voltage will be very high also on the sampling resistor, and voltage stabilizing didoe is parallelly connected with sampling resistor; The voltage at voltage stabilizing didoe two ends is the voltage on the sampling resistor; In case if the voltage at voltage stabilizing didoe two ends greater than its critical reverse breakdown voltage, then voltage stabilizing didoe is reversed puncture, absorbs the induced current on the secondary winding through voltage stabilizing didoe; And the voltage stabilizing didoe voltage; Be that voltage on the sampling resistor then keeps constant, still can gather voltage and output voltage signal on the sampling resistor as the earth fault signal through voltage sensor, and can be because of excessive damage voltage sensor of the voltage on the sampling resistor or control unit.
In the present embodiment; The purpose that the voltage stabilizing didoe of two reverse parallel connections is set is; When earth current is an alternating current, and, when this earth current is very big impulse current; The mutual inductance electric current that secondary winding in current transformer produces also is bigger alternating current, and two voltage stabilizing didoes puncture so that voltage sensor and control unit are protected at the positive half period and the negative half-cycle of this alternating current respectively.
Can also comprise filter 17 in this earth-fault protection, the input of this filter 17 links to each other with said ground path, and the output of filter 17 links to each other with winding 131 input terminals of said current transformer 13.
Filter can be used for filtering ground path and produces the Harmonic Interference signal in the earth current; Keep the earth current signal; And then export to a winding of current transformer; Make last voltage signal more accurate, avoid receiving the interference of other signals, guarantee the stable operation of locomotive secondary power system through voltage sensor output.
The structural representation of the locomotive secondary power system earth-fault protection that Fig. 3 is provided for the another embodiment of the utility model; As shown in Figure 3; Power supply unit 11 in this earth-fault protection comprises power supply 111, current transformer 112 and the transformer 113 that connects successively, and wherein, said control unit 10 links to each other with said current transformer 112; Be used to generate control signal to said current transformer 112, with the running status of controlling said current transformer 112 to drive the operation of said load 12; Be in series with reactor 18 between said transformer 113 outlet sides and the said load 12, the two ends of said reactor 18 are parallel with electric capacity 19.
The locomotive secondary power system earth-fault protection of present embodiment, power supply unit comprises power supply, current transformer and transformer, wherein; Power supply can be DC power supply or AC power; Control unit is used to produce the control signal to current transformer, and the control current transformer carries out processing such as rectification or inversion to the voltage of power supply output, transformer the voltage of current transformer output is boosted or step-down after export to load; Think that load provides suitable driving voltage, drive load running.
This instance only provides a kind of concrete structure of power supply unit, and power supply unit also can be other forms, and it is said to be not limited to present embodiment.
And, be provided with reactor in the earth-fault protection of present embodiment, utilize the inhibitory action of reactor to transient current; Can reduce to produce the percussion of earth current to load because of the load faulty ground path; And when power supply unit or load etc. was short-circuited, reactor can also play the increase short-circuit impedance; Limit the effect of short circuit current in the whole locomotive secondary power system circuit, improve the stability of locomotive secondary power system operation.
Reactor is the device that is perception, and the reactive power component is increased, for this reason, and shunt capacitance on reactor, the reactive power component that causes with compensation reactor perception inductance.
The utility model embodiment also provides a kind of electric locomotive; This locomotive comprises car body; Also comprise the locomotive secondary power system earth-fault protection that the utility model embodiment provides, the power supply unit of said locomotive secondary power system earth-fault protection comprises transformer at least, and the center line of said transformer links to each other with said car body; Said load links to each other with said car body through earth lead, and the center line of said transformer, car body and said earth lead constitute ground path.
The locomotive secondary power system earth-fault protection that this electric locomotive adopts the utility model embodiment to provide, earth-fault protection can be applicable in the locomotive secondary power system secondary power system for to the electric power system of (comprising various blower fans, oil pump, air compressor and air-conditioning etc.) of the assistant load as load in the electric locomotive.
The center line of transformer, car body and earth lead constitute ground path, because car body links to each other with the earth, the car body current potential is zero, and load shell and car body equipotential, the current potential of load shell also is zero, therefore, has guaranteed personnel's safety in the locomotive.
The earth-fault protection that the electric locomotive that present embodiment provides adopts the utility model embodiment to provide; When the load generation earth fault in the locomotive; Can detect load earth fault timely; Ensure the safe operation of whole locomotive secondary power system, therefore, for the safe operation of electric locomotive is given security.
What should explain at last is: above each embodiment is only in order to the technical scheme of explanation the utility model, but not to its restriction; Although the utility model has been carried out detailed explanation with reference to aforementioned each embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, perhaps to wherein part or all technical characteristic are equal to replacement; And these are revised or replacement, do not make the scope of each embodiment technical scheme of essence disengaging the utility model of relevant art scheme.
Claims (5)
1. locomotive secondary power system earth-fault protection; Comprise the control unit, power supply unit and the load that connect successively; The operating state that said control unit is used to control power supply unit is to drive the operation of said load; And said load is characterized in that through ground path ground connection this earth-fault protection also comprises:
Current transformer, a winding input terminal of said current transformer is connected in the said ground path;
Sampling resistor, said sampling resistor are connected in the secondary winding lead-out terminal two ends of said current transformer;
Voltage sensor is connected in said sampling resistor two ends, is used to gather voltage and output voltage signal on the said sampling resistor to send said control unit to as the earth fault signal, controls said power supply unit for said control unit and quits work.
2. locomotive secondary power system earth-fault protection according to claim 1 is characterized in that, also comprises:
Two voltage stabilizing didoes are parallel to said sampling resistor two ends after two said voltage stabilizing didoe inverse parallels.
3. locomotive secondary power system earth-fault protection according to claim 1 and 2 is characterized in that, also comprises:
Filter, the input of said filter links to each other with said ground path, and the output of said filter links to each other with a winding input terminal of said current transformer.
4. locomotive secondary power system earth-fault protection according to claim 1 and 2 is characterized in that: said power supply unit comprises power supply, current transformer and the transformer that connects successively, wherein,
Said control unit links to each other with said current transformer, is used to generate the control signal to said current transformer, with the running status of controlling said current transformer to drive the operation of said load;
Be in series with reactor between said transformer outlet side and the said load, the two ends of said reactor are parallel with electric capacity.
5. electric locomotive; Comprise car body, it is characterized in that, also comprise the arbitrary described locomotive secondary power system earth-fault protection of claim 1-4; The power supply unit of said locomotive secondary power system earth-fault protection comprises transformer at least; The center line of said transformer links to each other with said car body, and said load links to each other with said car body through earth lead, and the center line of said transformer, car body and said earth lead constitute ground path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201326688U CN202524057U (en) | 2012-03-31 | 2012-03-31 | Earth fault protection device of locomotive auxiliary power system and electric locomotive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201326688U CN202524057U (en) | 2012-03-31 | 2012-03-31 | Earth fault protection device of locomotive auxiliary power system and electric locomotive |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368128A (en) * | 2012-03-31 | 2013-10-23 | 永济新时速电机电器有限责任公司 | Ground fault protection device for locomotive auxiliary power system and electric locomotive |
| CN105075050A (en) * | 2013-02-26 | 2015-11-18 | 卡特彼勒公司 | Ground fault protection systems and methods |
| CN112867928A (en) * | 2018-07-17 | 2021-05-28 | 哈勃股份有限公司 | Voltage collector for power distribution system device |
| CN113505900A (en) * | 2021-07-11 | 2021-10-15 | 中国国家铁路集团有限公司 | Motor train unit auxiliary converter module digital maintenance platform and method |
-
2012
- 2012-03-31 CN CN2012201326688U patent/CN202524057U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368128A (en) * | 2012-03-31 | 2013-10-23 | 永济新时速电机电器有限责任公司 | Ground fault protection device for locomotive auxiliary power system and electric locomotive |
| CN103368128B (en) * | 2012-03-31 | 2016-08-10 | 永济新时速电机电器有限责任公司 | Locomotive secondary power system earth-fault protection and electric locomotive |
| CN105075050A (en) * | 2013-02-26 | 2015-11-18 | 卡特彼勒公司 | Ground fault protection systems and methods |
| CN105075050B (en) * | 2013-02-26 | 2017-03-22 | 卡特彼勒公司 | Ground fault protection systems and methods |
| CN112867928A (en) * | 2018-07-17 | 2021-05-28 | 哈勃股份有限公司 | Voltage collector for power distribution system device |
| CN113505900A (en) * | 2021-07-11 | 2021-10-15 | 中国国家铁路集团有限公司 | Motor train unit auxiliary converter module digital maintenance platform and method |
| CN113505900B (en) * | 2021-07-11 | 2023-12-01 | 中国国家铁路集团有限公司 | Digital maintenance platform and method for auxiliary converter module of motor train unit |
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Granted publication date: 20121107 Termination date: 20170331 |
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| CF01 | Termination of patent right due to non-payment of annual fee |