CN105896466A - Ground protection device and ground protection method of train assistant system - Google Patents
Ground protection device and ground protection method of train assistant system Download PDFInfo
- Publication number
- CN105896466A CN105896466A CN201610366477.0A CN201610366477A CN105896466A CN 105896466 A CN105896466 A CN 105896466A CN 201610366477 A CN201610366477 A CN 201610366477A CN 105896466 A CN105896466 A CN 105896466A
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- China
- Prior art keywords
- aid system
- train
- residual current
- earth
- breaker
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/267—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires
Landscapes
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The invention relates to a ground protection device and ground protection method of a train assistant system. The ground protection device comprises a zero sequence current sensor and a residual current monitoring relay, wherein a main wire and a neutral line which are connected with a load both pass through an opening of an annular iron core of the zero sequence current sensor, and the residual current monitoring relay is connected to a secondary winding of the annular iron core. The ground protection method is a method based on the above ground protection device. The ground protection device has the advantages of simplicity and compactness in structure, high sensitivity, high reliability and the like.
Description
Technical field
Present invention relates generally to rail traffic vehicles field, refer in particular to a kind of train aid system earth protective device and earthing protecting method.
Background technology
Train aid system is the important component part of rail vehicle, mainly it is made up of auxiliary transformer, subordinate inverter, wave filter, AC load, charger, DC load etc., provides power supply for equipment such as the traction control of train, network control, control for brake, illumination, air compressor, signals of communication.Therefore, the safety and stability of train aid system has extremely important effect for safe train operation and normal work.Inside the factor that had an impact aid system normally works, occurring that ground connection situation is the most also is to affect one of maximum situation, it can affect aid system and normally work, and makes train be not normally functioning, and line insulation also can be caused the when of serious to destroy harm equipment and personal safety.Therefore train aid system is carried out reliable ground protection to be particularly important.
Aid system earthing detection mode conventional in track field at present is: detects certain some current potential by ground detection device measurement circuitry insulation resistance value and resistor network and judges whether ground connection occur.The earth fault of aid system causes mainly due to the insulation of electrical equipment or wire, directly contact with steel structure of car body is " dead ground connection ", nuditing wire part by air to steel construction discharge or insulant surface to steel construction creepage be " swinging earth ", no matter " dead ground connection " or " swinging earth ", will produce leakage current, etching apparatus also destroys insulation.If more than 2 ground connection occur, it would be possible to causing short trouble and burning apparatus or wire, so sensitivity reliably grounded detection device must be installed in train aid system, otherwise the safety and stability of train aid system will be difficult to ensure that.
In existing field of track traffic, conventional train aid system earthing protecting method mainly has following several:
(1) by ground detection device measurement circuitry insulation resistance value, to judge whether ground connection.The program requires that auxiliary transformer neutral point forms high resistance grounding by electric capacity, and property point accesses ground detection device from which, calculates the insulation resistance value of circuit by sending DC pulse, to judge state of insulation.When the insulation resistance value detected is less than setting valve, protection device action, faulty line is isolated.Due to auxiliary transformer neutral point high resistance grounding, in actual moving process, floating easily occurs in auxiliary transformer secondary side neutral point potential, and causes phase voltage lifting, impacts load supplying stability, simultaneously when there is single-phase earthing, load equipment is easily made to bear overvoltage risk.
(2) between three-phase line and ground, access resistor network, judge whether that earth fault occurs by detecting certain some current potential.If there is a certain phase ground connection, by earthing detection voltage sensor senses resistor network neutral point voltage-to-ground, as aid system earthing detection signal.When the voltage signal detected exceedes setting valve, protection device action, faulty line is isolated.Finding that in practice this ground detection device is big due to earth resistance, leakage current is little, and the signal closed loop of voltage sensor ratio is shallower thus there is the problem that control accuracy is the highest, causes ground protection the sensitiveest, the threshold value that the ground connection that is unfavorable for adjusting judges.Disturb simultaneously as voltage sensor is easily floated current potential by train, ground detection device misoperation easily occurs.
In sum, existing train aid system earthing protecting method has a following deficiency:
(1) often needing auxiliary transformer neutral point by high resistance grounding, in actual moving process, floating easily occurs in auxiliary transformer secondary survey neutral point potential, and causes phase voltage lifting, impacts load supplying stability.
(2) when there is single-phase earthing, load equipment is easily made to bear overvoltage risk.
(3) there is the problem that control accuracy is the highest.
(4) setting valve is difficult to adjustment, the easy misoperation of ground detection device.
Summary of the invention
The technical problem to be solved in the present invention is that the technical problem existed for prior art, and the present invention provides the high train aid system earth protective device of a kind of simple and compact for structure, sensitivity, reliability and earthing protecting method.
For solve above-mentioned technical problem, the present invention by the following technical solutions:
A kind of train aid system earth protective device; including zero sequence current sensor and residual current monitoring relay; the main traverse line of connection load and the neutral conductor both pass through the opening of the annular core of described zero sequence current sensor, and described residual current monitoring relay is connected to be positioned in the Secondary Winding of described annular core.
A kind of train aid system earthing protecting method, both passes through the main traverse line and the neutral conductor that connect load the opening of the annular core of zero sequence current sensor, is connected to residual current monitoring relay be positioned in the Secondary Winding of described annular core；If equipment is properly functioning, fault-free occurs, then the electric current summation flowed in and out is equal to zero；If it occur that insulation fault residual current reduces, then the summation of inflow current is more than the summation flowing out electric current；Residual current induces a secondary current in Secondary Winding.
Further improvement as the inventive method: in described residual current monitoring relay, residual current is calculated, when exceeding the trip threshold of setting, residual current monitoring relay generation action.
Further improvement as the inventive method: if measured residual current exceedes the drop-away value of setting, then starting the time delay of setting, the symbol of relay flashes.
Further improvement as the inventive method: coordinate with load earth leakage circuit-breaker; i.e. under loaded single phase Grounding; if there is the prime at branch road earth leakage circuit-breaker in single-phase earthing; then aid system earth leakage protective device reports and submits aid system earth fault, to control unit, control unit, auxiliary transformer neutral ground catalyst K is carried out jumper connection tentaculum protection；Train remains properly functioning, gets rid of earth fault in time putting maintenance afterwards in storage.
Further improvement as the inventive method: if single-phase earthing occurs the rear class at branch road earth leakage circuit-breaker; the earth leakage circuit-breaker of corresponding branch road is jumped disconnected immediately; in the case of corresponding branch circuit load does not affects traction; its earth leakage circuit-breaker is jumped motor-car of having no progeny and is continued to run, and aid system earth protective device is failure to actuate simultaneously.
Compared with prior art, it is an advantage of the current invention that:
The train aid system earth protective device of the present invention and earthing protecting method, including zero sequence current sensor and residual current monitoring relay, zero sequence current sensor is responsible for detection of electrical leakage, and carries out earth leakage protective by residual current monitoring relay.Detect circuit zero-sequence current by zero sequence current sensor, device is simple, sensitivity and reliability high.When earth fault occurs in three-phase line, zero sequence current sensor detects zero-sequence current, residual current monitoring relay respective switch action, and train control system detects the change of switch current potential, protects faulty line.
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of earth protective device of the present invention.
Fig. 2 is the schematic diagram that the present invention is applied to stand alone type auxiliary power supply system.
Fig. 3 is the schematic diagram that the present invention is applied to parallel auxiliary power supply system.
Fig. 4 is the principle schematic that the present invention carries out ground protection in concrete application example.
Fig. 5 is that the present invention coordinates the schematic diagram realizing cascade protection in concrete application example with load earth leakage circuit-breaker.
Detailed description of the invention
Below with reference to Figure of description and specific embodiment, the present invention is described in further details.
As shown in Figure 1; the train aid system earth protective device of the present invention; including zero sequence current sensor and residual current monitoring relay; the main traverse line of connection load and the neutral conductor both pass through the opening of the annular core of zero sequence current sensor, and residual current monitoring relay is connected to be positioned in the Secondary Winding of described annular core.
If equipment is properly functioning, fault-free occurs, then the electric current summation flowed in and out is equal to zero.In this case, the Secondary Winding of zero sequence current sensor there is no induced voltage.But, if it occur that insulation fault causes flowing out current reduction, then the summation of inflow current is more than the summation flowing out electric current.Residual current (difference current) induces a secondary current in Secondary Winding.In residual current monitoring relay, this electric current is calculated, on the one hand for showing the residual current of reality, on the other hand, when exceeding the trip threshold of setting, residual current monitoring relay generation action.
If measured residual current exceedes the drop-away value of setting, then starting the time delay of setting, the symbol of relevant relay flashes.After time delay; relevant changeover contact then changes its on off state (14 on off states in Fig. 1); there is earth fault by 14 conversion i.e. aid systems on off state being detected in train control system, and control system can carry out jumper connection tentaculum protection to aid system.
In actual moving process; separate type is had to power and two kinds of power supply modes of parallel power supply in view of train aid system; (it is parallel to as a example by one group of bus by two groups of aid systems with regard to separate type autonomous power supply system and parallel electric power system below; the protection scheme that actual aid system more than two parallel connection still can use the present invention to propose), respectively technical scheme is introduced.
As in figure 2 it is shown, when train aid system is stand alone type electric power system, and i.e. one AuCT stands alone as some groups of loads and is powered.Require time properly functioning that auxiliary transformer neutral ground catalyst K is kept closed, when there is a certain phase ground connection in three-phase system, fault phase constitutes a complete leakage current loop by auxiliary transformer neutral point, zero sequence current sensor detects leakage current, if leakage current exceedes residual current monitoring relay trip threshold, the changeover contact that residual current monitoring relay is relevant then changes its on off state, train control system i.e. reports aid system earth fault by 14 conversions on off state being detected, system can carry out jumper connection tentaculum protection to auxiliary transformer neutral ground catalyst K, bigger leakage current is continued to avoid the occurrence of.
As it is shown on figure 3, when train aid system is parallel electric power system, i.e. multiple stage AuCT output-parallel is powered for some groups of loads on same group of bus.Time properly functioning, it is desirable to each auxiliary transformer neutral ground catalyst K has and only one of which Guan Bi, and remaining all disconnects, to ensure the N line only one of which earth point of car load, will not form car body backflow affects residual current detection.Below as a example by two AuCT output-parallels are powered, parallel power supply aid system ground protection scheme is introduced.As it is shown on figure 3, pre-set K11 earthing contactor Guan Bi, K12 earthing contactor disconnects, and the setting of this catalyst can pass through networked control system of the train, to ensure the N line only one of which earth point of car load.When there is a certain phase ground connection in three-phase system, fault phase constitutes a complete leakage current loop by auxiliary transformer neutral point Guan Bi catalyst K11, zero sequence current sensor LH1 detects leakage current, if leakage current exceedes residual current monitoring relay trip threshold, the changeover contact that residual current monitoring relay is relevant then changes its on off state, train control system i.e. reports aid system earth fault by 14 conversions on off state being detected, system can carry out jumper connection tentaculum protection to auxiliary transformer neutral ground catalyst K11, bigger leakage current is continued to avoid the occurrence of.Every auxiliary change all adds earth leakage protective device in catalyst K1 rear end, two set earth leakage protective device monitoring system leakage currents simultaneously, can improve reliability and the redundancy of system earth protection.
When specifically applying, the fundamental block diagram of aid system ground protection of the present invention as shown in Figure 4:
When earth fault occur in three-phase power line, bus or load, earth fault passes through auxiliary transformer neutral ground catalyst, forms fault loop.Now, zero sequence current sensor detects leakage current, if leakage current exceedes residual current monitoring relay trip threshold, the changeover contact that residual current monitoring relay is relevant then changes its on off state, control unit detects the conversion of relevant switches state, reports and submits aid system earth fault and is shown at display unit.Control unit can carry out jumper connection tentaculum protection to auxiliary transformer neutral ground catalyst K simultaneously, continues bigger leakage current to avoid the occurrence of.Train remains properly functioning, gets rid of earth fault in time putting maintenance afterwards in storage.
Simultaneously; aid system ground protection of the present invention can also with load earth leakage circuit-breaker with the use of; as shown in Figure 5; under certain loaded single phase Grounding; if there is the prime at branch road earth leakage circuit-breaker in single-phase earthing; then aid system earth leakage protective device can report and submit aid system earth fault auxiliary transformer neutral ground catalyst K can be carried out jumper connection tentaculum protection to control unit, control unit, continue bigger leakage current to avoid the occurrence of.Train remains properly functioning, gets rid of earth fault in time putting maintenance afterwards in storage.
If single-phase earthing occurs the rear class at branch road earth leakage circuit-breaker, the earth leakage circuit-breaker of corresponding branch road can be jumped disconnected immediately, and in the case of corresponding branch circuit load does not affects traction, its earth leakage circuit-breaker is jumped motor-car of having no progeny and can be continued to run.Aid system earth protective device is failure to actuate simultaneously.
Below being only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment, and all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be regarded as protection scope of the present invention.
Claims (6)
1. a train aid system earth protective device; it is characterized in that; including zero sequence current sensor and residual current monitoring relay; the main traverse line of connection load and the neutral conductor both pass through the opening of the annular core of described zero sequence current sensor, and described residual current monitoring relay is connected to be positioned in the Secondary Winding of described annular core.
2. a train aid system earthing protecting method, it is characterised in that the main traverse line and the neutral conductor that connect load are both passed through the opening of the annular core of zero sequence current sensor, is connected to residual current monitoring relay be positioned in the Secondary Winding of described annular core；If equipment is properly functioning, fault-free occurs, then the electric current summation flowed in and out is equal to zero；If it occur that insulation fault residual current reduces, then the summation of inflow current is more than the summation flowing out electric current；Residual current induces a secondary current in Secondary Winding.
Train aid system earthing protecting method the most according to claim 2, it is characterised in that in described residual current monitoring relay, residual current is calculated, when exceeding the trip threshold of setting, residual current monitoring relay generation action.
Train aid system earthing protecting method the most according to claim 3, it is characterised in that if measured residual current exceedes the drop-away value of setting, then starting the time delay of setting, the symbol of relay flashes.
5. according to the train aid system earthing protecting method described in Claims 2 or 3 or 4; it is characterized in that; coordinate with load earth leakage circuit-breaker; i.e. under loaded single phase Grounding; if there is the prime at branch road earth leakage circuit-breaker in single-phase earthing; then aid system earth leakage protective device reports and submits aid system earth fault, to control unit, control unit, auxiliary transformer neutral ground catalyst K is carried out jumper connection tentaculum protection；Train remains properly functioning, gets rid of earth fault in time putting maintenance afterwards in storage.
Train aid system earthing protecting method the most according to claim 5; it is characterized in that; if there is the rear class at branch road earth leakage circuit-breaker in single-phase earthing; the earth leakage circuit-breaker of corresponding branch road is jumped disconnected immediately; in the case of corresponding branch circuit load does not affects traction; its earth leakage circuit-breaker is jumped motor-car of having no progeny and is continued to run, and aid system earth protective device is failure to actuate simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610366477.0A CN105896466A (en) | 2016-05-30 | 2016-05-30 | Ground protection device and ground protection method of train assistant system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610366477.0A CN105896466A (en) | 2016-05-30 | 2016-05-30 | Ground protection device and ground protection method of train assistant system |
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| CN201610366477.0A Pending CN105896466A (en) | 2016-05-30 | 2016-05-30 | Ground protection device and ground protection method of train assistant system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067168A (en) * | 2018-08-24 | 2018-12-21 | 中车南京浦镇车辆有限公司 | A method of reducing rail vehicle subordinate inverter EMC electromagnetic interference |
| CN110275082A (en) * | 2018-03-16 | 2019-09-24 | 中车株洲电力机车研究所有限公司 | A kind of ground connection diagnostic method, system and the device of main circuit of converter |
| CN111342426A (en) * | 2018-12-19 | 2020-06-26 | 比亚迪股份有限公司 | Rail vehicle, control device of rail vehicle, leakage protection system, leakage protection method and leakage protection device |
| CN113690639A (en) * | 2020-05-19 | 2021-11-23 | 中车唐山机车车辆有限公司 | Rail train's ground system and rail train |
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| US5402299A (en) * | 1992-09-18 | 1995-03-28 | S&C Electric Company | Coordination arrangment for protective devices in electrical systems |
| CN101467322A (en) * | 2006-04-12 | 2009-06-24 | 深流技术有限公司 | Residual current device having voltage dependent and voltage independent modes of operation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110275082A (en) * | 2018-03-16 | 2019-09-24 | 中车株洲电力机车研究所有限公司 | A kind of ground connection diagnostic method, system and the device of main circuit of converter |
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| CN109067168A (en) * | 2018-08-24 | 2018-12-21 | 中车南京浦镇车辆有限公司 | A method of reducing rail vehicle subordinate inverter EMC electromagnetic interference |
| CN111342426A (en) * | 2018-12-19 | 2020-06-26 | 比亚迪股份有限公司 | Rail vehicle, control device of rail vehicle, leakage protection system, leakage protection method and leakage protection device |
| CN111342426B (en) * | 2018-12-19 | 2023-03-24 | 比亚迪股份有限公司 | Rail vehicle, control device of rail vehicle, leakage protection system, leakage protection method and leakage protection device |
| CN113690639A (en) * | 2020-05-19 | 2021-11-23 | 中车唐山机车车辆有限公司 | Rail train's ground system and rail train |
| CN113690639B (en) * | 2020-05-19 | 2022-09-23 | 中车唐山机车车辆有限公司 | Rail train's grounding system and rail train |
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Application publication date: 20160824 |