CN106080207B - Hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive - Google Patents

Hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive Download PDF

Info

Publication number
CN106080207B
CN106080207B CN201610529982.2A CN201610529982A CN106080207B CN 106080207 B CN106080207 B CN 106080207B CN 201610529982 A CN201610529982 A CN 201610529982A CN 106080207 B CN106080207 B CN 106080207B
Authority
CN
China
Prior art keywords
voltage
phase
output
amplitude
threshold
Prior art date
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.)
Active
Application number
CN201610529982.2A
Other languages
Chinese (zh)
Other versions
CN106080207A (en
Inventor
蔡志伟
杨曦亮
肖桦
陆璐
李哲
李斌
杜欣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CRRC Dalian Co Ltd
Original Assignee
CNR Dalian Locomotive and Rolling Stock Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CNR Dalian Locomotive and Rolling Stock Co Ltd filed Critical CNR Dalian Locomotive and Rolling Stock Co Ltd
Priority to CN201610529982.2A priority Critical patent/CN106080207B/en
Priority to PCT/CN2016/104651 priority patent/WO2018006516A1/en
Publication of CN106080207A publication Critical patent/CN106080207A/en
Application granted granted Critical
Publication of CN106080207B publication Critical patent/CN106080207B/en
Priority to ZA2018/04062A priority patent/ZA201804062B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
    • 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
    • H02H7/10—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 converters; for rectifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Inverter Devices (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The friendship orthogonal circuit ground guard method of the present invention, setting electric current threshold value Δ I, voltage threshold Δ U1、ΔU2、ΔU3, when vector I amplitude is higher than current threshold Δ I, if a phase voltage amplitude of output inverter output is less than voltage threshold Δ U1And other two-phase voltage phase differences then judge that this mutually has an one point earth, the connection of cut-out output inverter and main circuit intermediate DC link when being 60 °；If the phase voltage amplitude U of output inverter output1、U2、U3All higher than voltage threshold Δ U2, and voltage-to-ground is all negative or positive, then judges positive or negative bus P or the N ground connection of intermediate DC link, disconnect contactless contactor BKR, the connection of eliminating rectifier and AC power；If inverter output has two-phase voltage all higher than voltage threshold Δ U3, then the other phase ground connection of exchange input side, switching off AC power are judged.Cost can be reduced, rapid grounding diagnosis and positioning is realized, pinpoints the problems in advance, effective protection equipment.

Description

Hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive
Technical field
The present invention relates to one kind to hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive, belongs to locomotive technology Field.
Background technology
The characteristics of handing over orthogonal electric driving vehicle main circuit is high voltage, high current.During utilization, main circuit may be by It is grounded in cable aging, vibration friction etc..Earth fault is possible to influence the normal work of main circuit, or even produces very Big short circuit current, make locomotive transmission system part scaling loss, accident of locomotive defect is resulted even in when serious.Therefore, timely, accurate, Promptly earth point is judged and positioned extremely important.
Prior art is roughly divided into active inspection to hand over the ground detection device of orthogonal circuit to provide many technical schemes Survey and passive detection two ways.But the general volume of active ground detection device of prior art is bigger, structure is more multiple Miscellaneous, maintenance cost is high.Not only its relay contact can produce malfunction alarm, and its direct current control because of the vibration of locomotive operation Loop ground connection processed is also possible to produce electromagnetic interference to other control circuits of locomotive.And passive earthing detection dress of the prior art Do not need external input signal although putting, only by exchange the change of lateral circuit and main circuit positive and negative busbar voltage-to-ground waveform come Earth fault is judged whether, improves anti-interference, but protection " dead band " be present, and must be in a high voltage state Earth fault could be detected.
To overcome disadvantages mentioned above, No. 201210405663.2 Chinese patent applications《Locomotive traction and accessory system integration Earth protective device》Give a different scheme：At least two series resistances are connected on to the positive pole and negative pole of DC link Between, the resistor coupled in parallel of voltage sensor and one one termination negative or positive electrode, the other end ground connection of the resistance should by detection Ohmically voltage judges earth point.But in this scenario, the selection of the quantity and resistance of series resistance will determine to aid in The insulation against ground voltage of load especially auxiliary motor, if series resistance breaks down, it will have a strong impact on assistant load Operating voltage, reduce the reliability of locomotive operation.
The content of the invention
The purpose of the present invention is exactly to overcome the deficiency of above-mentioned prior art, there is provided a kind of simple in construction, safe and reliable, quick The friendship orthogonal circuit ground guard method of Accurate Diagnosis positioning and diesel generating set, locomotive.
The object of the present invention is achieved like this：One kind hand over orthogonal circuit ground guard method, it is characterised in that take as Lower step：
A. setting electric current threshold value Δ I, voltage threshold Δ U1、ΔU2、ΔU3；
B. the phase current I of collection exchange input sidea、Ib、IcAnd the phase voltage U of output inverter outputa1、Ub1、Uc1；
C. phase current I is calculateda、Ib、IcVector I, output inverter output phase voltage amplitude U1、U2、U3And voltage Phase difference θab、Δθbc、Δθca；
D. when vector I amplitude is less than current threshold Δ I, if the phase voltage amplitude U of output inverter output1、U2、 U3Both greater than voltage threshold Δ U1And voltage phase difference Δ θab、Δθbc、ΔθcaAll be 120 °, then the exchange input side of circuit, in Between DC link and exchange outlet side it is no ground；
E. when vector I amplitude is higher than current threshold Δ I, if the A phase voltage amplitudes of output inverter output are less than Voltage threshold Δ U1And voltage phase difference Δ θbcFor 60 ° when, then judge that A phases have an one point earth, cut-out output inverter and main electricity The connection of road intermediate DC link；The B phase voltages amplitude of output is less than voltage threshold Δ U1And the phase difference θ of C, A phase voltageca For 60 ° when, then judge that B phases have an one point earth, the connection of cut-out output inverter and main circuit intermediate DC link；The C of output Phase voltage amplitude is less than voltage threshold Δ U1And the phase difference θ of A, B phase voltageabFor 60 ° when, then judge C phases have one point earth, Cut off the connection of output inverter and main circuit intermediate DC link；
F. when vector I amplitude is higher than current threshold Δ I, if the phase voltage amplitude U of output inverter output1、U2、 U3All higher than voltage threshold Δ U2, and voltage-to-ground is all negative, then judges the positive bus-bar P ground connection of intermediate DC link, disconnect Contactless contactor BKR, the connection of eliminating rectifier and AC power；
G. when vector I amplitude is higher than current threshold Δ I, if A, B, C phase voltage of output inverter output are whole Higher than voltage threshold Δ U2, and voltage-to-ground is all just, then judges the negative busbar N ground connection of intermediate DC link, disconnect contactor Switch BKR, the connection of eliminating rectifier and AC power；
H. when vector I amplitude is higher than current threshold Δ I, if B, C phase voltage of inverter output are all higher than electricity Press threshold value Δ U3, then judge that exchange input side A phases are grounded, switching off AC power；If A, C phase voltage of inverter output are all high In voltage threshold Δ U3, then judge that exchange input side B phases are grounded, switching off AC power；If A, B phase voltage of inverter output are complete Portion is higher than voltage threshold Δ U3, then judge that exchange input side C phases are grounded, switching off AC power.
A kind of diesel generating set, it is characterised in that use above-mentioned friendship orthogonal circuit ground guard method.
A kind of railway locomotive, it is characterised in that use above-mentioned friendship orthogonal circuit ground guard method.
Technical scheme utilizes main circuit input side rectifier Current Mutual Inductance without Special grounding detection means Device, output inverter outlet side voltage transformer can hand over orthogonal main circuit grounding to be oriented detection in locomotive.Inspection can be saved Measurement equipment, reduce maintenance workload, reduce cost, quick diagnosis and positioning when realizing main circuit grounding, improve locomotive can By property, pinpoint the problems in advance, prevent problem from expanding, effective protection equipment.
Brief description of the drawings
Fig. 1 is the friendship orthogonal diesel-electric locomotive main circuit principle schematic of the embodiment of the present invention.
Fig. 2 is the program flow diagram of the friendship orthogonal circuit ground guard method of the embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The friendship orthogonal diesel-electric locomotive main circuit principle schematic of the embodiment of the present invention is as shown in Figure 1.Use electricity Road simulation software MATLAB, which is established, hands over orthogonal diesel-electric locomotive main circuit model, is separately operable various one-point grounding fault shapes Condition：Under all ground connection situations, the amplitude of the three-phase current vector of generator output is IJD, it is contemplated that detection sensor essence Degree and antijamming capability, determine current threshold Δ I≤IJD；When output inverter outlet side has phase ground connection, the phase of Earth Phase Voltage magnitude is USCJD, it is contemplated that detection sensor precision and antijamming capability, determine voltage threshold Δ U1≥USCJD；In Between DC link positive bus-bar or negative busbar be grounded when, the three-phase voltage amplitude of output inverter outlet side is UZLJD, consider To detection sensor precision and antijamming capability, voltage threshold Δ U is determined2≤UZJD；There is one to connect in rectifier exchange input side During ground, B, C phase voltage or C, A phase voltage or A, B phase voltage of output inverter output are equal to USRJD, it is contemplated that detection sensing Device precision and antijamming capability, determine voltage threshold Δ U3≤USRJD。
Referring to the friendship orthogonal circuit ground detection method program flow diagram of the embodiment of the present invention shown in accompanying drawing 2.Program is entered Enter frame 2.1 to start to detect.Input side rectifier three-phase current I is gathered into frame 2.2a、Ib、Ic.It is inverse into the collection output of frame 2.3 Become the three-phase voltage U that device 1 exportsa1、Ub1、Uc1.Three-phase current I is calculated into frame 2.4a、Ib、IcVector I.Into frame 2.5 Calculate three-phase voltage Ua1、Ub1、Uc1Amplitude U1、U2、U3.U is calculated into frame 2.6a1And Ub1Phase difference θab.Into frame 2.7 Calculate Ub1And Uc1Phase difference θbc.U is calculated into frame 2.8c1And Ua1Phase difference θca.Judge vector I into frame 2.9 Amplitude whether be less than current threshold Δ I.If the condition of frame 2.9 meets, U is judged into frame 2.191、U2、U3Whether voltage threshold is more than It is worth Δ U1And phase difference θab、Δθbc、ΔθcaAll it is 120 °.If the condition of frame 2.19 meets, judge that Main Circuit of Diesel Locomotive is equal It is no ground, it is then back to main program；If the condition of frame 2.19 is unsatisfactory for, main program is returned.If the condition of frame 2.9 is unsatisfactory for, into frame 2.10 judge U1Whether voltage threshold Δ U is less than1And Ub1And Uc1Phase difference θbcFor 60 °.If the condition of frame 2.10 meets, enter Enter frame 2.21, judge that main circuit inverter outlet side A phases have one point earth, disconnect contactless contactor BKI, cut off output inverter With the connection of main circuit intermediate DC link, main program is then back to；If the condition of frame 2.10 is unsatisfactory for, U is judged into frame 2.112 Whether voltage threshold Δ U is less than1And Uc1And Ua1Phase difference θcaFor 60 °.If the condition of frame 2.11 meets, into frame 2.22, Judge that main circuit inverter outlet side B phases have one point earth, disconnect contactless contactor BKI, cut off output inverter and main circuit The connection of intermediate DC link, is then back to main program；If the condition of frame 2.11 is unsatisfactory for, U is judged into frame 2.123Whether it is less than Voltage threshold Δ U1And Ua1And Ub1Phase difference θabFor 60 °.If the condition of frame 2.12 meets, into frame 2.23, main electricity is judged Road inverter outlet side C phases have one point earth, disconnect contactless contactor BKI, cut off output inverter and main circuit intermediate dc The connection of link, is then back to main program；If the condition of frame 2.12 is unsatisfactory for, U is judged into frame 2.131、U2、U3Whether Δ is more than U2And it is all negative value.If the condition of frame 2.13 meets, into frame 2.24, judge the positive bus-bar P ground connection of main circuit DC link, break Open contactless contactor BKR, the connection of eliminating rectifier and main generator G, it is then back to main program；If the condition of frame 2.13 is discontented with Foot, judges U into frame 2.141、U2、U3Whether Δ U is more than2And be all on the occasion of.If the condition of frame 2.14 meets, into frame 2.25, Judge the negative busbar N ground connection of main circuit DC link, disconnect contactless contactor BKR, the company of eliminating rectifier and main generator G Connect, be then back to main program；If the condition of frame 2.14 is unsatisfactory for, main program is returned.B, C of inverter output are judged into frame 2.15 Whether phase voltage is all higher than voltage threshold Δ U3If the condition of frame 2.15 meets, into frame 2.26, exchange input side A is judged Mutually it is grounded, diesel generating set is shut down, and is then back to main program；If the condition of frame 2.15 is unsatisfactory for, into frame 2.16.In frame 2.16, judge A, C phase voltage of inverter output whether all higher than voltage threshold Δ U3If the condition of frame 2.16 meets, enter Enter frame 2.27, judge that exchange input side B phases are grounded, diesel generating set is shut down, and is then returned and is added main program；If the condition of frame 2.16 is not Meet, then into frame 2.17.In frame 2.17, judge A, B phase voltage of inverter output whether all higher than voltage threshold Δ U3, If the condition of frame 2.17 meets, into frame 2.28, judge that exchange input side C phases are grounded, diesel generating set is shut down, and is then back to Main program；If the condition of frame 2.17 is unsatisfactory for, main program is returned.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic； And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and Scope.

Claims (3)

1. one kind hands over orthogonal circuit ground guard method, it is characterised in that takes following steps：
A. setting electric current threshold value Δ I, voltage threshold Δ U1、ΔU2、ΔU3；
B. the phase current I of collection exchange input sidea、Ib、IcAnd the phase voltage U of output inverter outputa1、Ub1、Uc1；
C. phase current I is calculateda、Ib、IcVector I, output inverter output phase voltage amplitude U1、U2、U3And voltage-phase Poor Δ θab、Δθbc、Δθca；
D. when vector I amplitude is less than current threshold Δ I, if the phase voltage amplitude U of output inverter output1、U2、U3All More than voltage threshold Δ U1And voltage phase difference Δ θab、Δθbc、ΔθcaIt all it is 120 °, then the exchange input side of circuit, centre are straight Flow link and exchange outlet side is no ground；
E. when vector I amplitude is higher than current threshold Δ I, if the A phase voltages amplitude of output inverter output is less than voltage Threshold value Δ U1And voltage phase difference Δ θbcFor 60 ° when, then judge that A phases have an one point earth, cut-out output inverter with main circuit Between DC link connection；The B phase voltages amplitude of output is less than voltage threshold Δ U1And the phase difference θ of C, A phase voltagecaFor At 60 °, then judge that B phases have one point earth, the connection of cut-out output inverter and main circuit intermediate DC link；The C phases of output Voltage magnitude is less than voltage threshold Δ U1And the phase difference θ of A, B phase voltageabFor 60 ° when, then judge C phases have one point earth, cut The connection of disconnected output inverter and main circuit intermediate DC link；
F. when vector I amplitude is higher than current threshold Δ I, if the phase voltage amplitude U of output inverter output1、U2、U3Entirely Portion is higher than voltage threshold Δ U2, and voltage-to-ground is all negative, then judges the positive bus-bar P ground connection of intermediate DC link, disconnect contact Device switchs BKR, the connection of eliminating rectifier and AC power；
G. when vector I amplitude is higher than current threshold Δ I, if output inverter output A, B, C phase voltage all higher than Voltage threshold Δ U2, and voltage-to-ground is all just, then judges the negative busbar N ground connection of intermediate DC link, disconnect contactless contactor BKR, the connection of eliminating rectifier and AC power；
H. when vector I amplitude is higher than current threshold Δ I, if B, C phase voltage of inverter output are all higher than voltage threshold It is worth Δ U3, then judge that exchange input side A phases are grounded, switching off AC power；If A, C phase voltage of inverter output are all higher than electricity Press threshold value Δ U3, then judge that exchange input side B phases are grounded, switching off AC power；If A, B phase voltage of inverter output are all high In voltage threshold Δ U3, then judge that exchange input side C phases are grounded, switching off AC power.
2. a kind of diesel generating set, it is characterised in that using friendship orthogonal circuit ground guard method described in claim 1.
3. a kind of railway locomotive, it is characterised in that using friendship orthogonal circuit ground guard method described in claim 1.
CN201610529982.2A 2016-07-07 2016-07-07 Hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive Active CN106080207B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201610529982.2A CN106080207B (en) 2016-07-07 2016-07-07 Hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive
PCT/CN2016/104651 WO2018006516A1 (en) 2016-07-07 2016-11-04 Ac-dc-ac circuit grounding protection method, diesel generator set and locomotive
ZA2018/04062A ZA201804062B (en) 2016-07-07 2018-06-18 Ac-dc-ac circuit grounding protection method, diesel generator set and locomotive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610529982.2A CN106080207B (en) 2016-07-07 2016-07-07 Hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive

Publications (2)

Publication Number Publication Date
CN106080207A CN106080207A (en) 2016-11-09
CN106080207B true CN106080207B (en) 2018-03-13

Family

ID=57213099

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610529982.2A Active CN106080207B (en) 2016-07-07 2016-07-07 Hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive

Country Status (3)

Country Link
CN (1) CN106080207B (en)
WO (1) WO2018006516A1 (en)
ZA (1) ZA201804062B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110350483B (en) 2018-04-04 2022-03-08 台达电子工业股份有限公司 Power converter device with ground fault detection function and fault detection method
CN109532571B (en) * 2019-01-09 2023-05-02 西南交通大学 Three-phase power supply control system of electrified railway train

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1411116A (en) * 2002-11-29 2003-04-16 清华大学 Generator stator single phase grounding protection method
JP2011217481A (en) * 2010-03-31 2011-10-27 Daihen Corp Ground fault direction detecting device
CN204347481U (en) * 2015-01-20 2015-05-20 北京东风机车电器厂 A kind of articulated truck alternating current drive system electric control device
CN104764978A (en) * 2015-03-26 2015-07-08 河海大学 Single-phase earth fault phase selection and transition resistance measurement method
CN104811025A (en) * 2015-05-06 2015-07-29 永济新时速电机电器有限责任公司 Auxiliary converter with multiple protections

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11164421A (en) * 1997-11-27 1999-06-18 Mitsubishi Electric Corp Ac-dc converter equipment
CN1250978C (en) * 2004-09-24 2006-04-12 北京交通大学 Passive earth detecting method and device for main circuit of ac-dc electric locomotive
US7643260B2 (en) * 2005-10-11 2010-01-05 Arris Group, Inc. System for EMI filter surge voltage clamping
US8159802B2 (en) * 2008-11-17 2012-04-17 Lockheed Martin Corporation 3-phase power factor corrected AC to DC filtered switching power supply
CN102466770A (en) * 2010-11-11 2012-05-23 株洲南车时代电气股份有限公司 Method and system for judging ground fault point of AC-DC-AC (Alternating Current-Direct Current-Alternating Current) electric locomotive
CN103770650B (en) * 2012-10-22 2016-08-31 中车大同电力机车有限公司 Locomotive traction and aid system Integral grounding protection device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1411116A (en) * 2002-11-29 2003-04-16 清华大学 Generator stator single phase grounding protection method
JP2011217481A (en) * 2010-03-31 2011-10-27 Daihen Corp Ground fault direction detecting device
CN204347481U (en) * 2015-01-20 2015-05-20 北京东风机车电器厂 A kind of articulated truck alternating current drive system electric control device
CN104764978A (en) * 2015-03-26 2015-07-08 河海大学 Single-phase earth fault phase selection and transition resistance measurement method
CN104811025A (en) * 2015-05-06 2015-07-29 永济新时速电机电器有限责任公司 Auxiliary converter with multiple protections

Also Published As

Publication number Publication date
ZA201804062B (en) 2019-04-24
WO2018006516A1 (en) 2018-01-11
CN106080207A (en) 2016-11-09

Similar Documents

Publication Publication Date Title
CN101609124B (en) Grounding detecting method of power supply system of train
CN102841284B (en) On-line insulated monitoring method for high voltage of electromobile
CN102590654B (en) Element and method for discriminating fault electrode of DC transmission line
CN103474980B (en) A kind of power distribution network single-phase ground protection method based on transient power direction
CN110703138B (en) Ground fault detection method and device for traction system of motor train unit
CN103795046A (en) Protection method and device of an electrical network for aircraft
Liu et al. An improved SSCB combining fault interruption and fault location functions for DC line short-circuit fault protection
CN107834511B (en) More secondary transformer secondary circuit short-circuit protective devices and method
CN110488135B (en) Grounding fault judgment method and positioning strategy for high-power permanent magnet direct-drive locomotive converter
CN107422185A (en) A kind of insulation resistance of DC system observation circuit, system and method
CN107979068B (en) A kind of anti-person electric shock control method of isolated neutral power distribution network
CN103323674A (en) Circuit and method for real-time detection of ground insulation impedance of photovoltaic grid-connected inverter
CN106199145A (en) Boats and ships AC system short circuit current direction determination process based on current changing rate
CN103683188B (en) The safety detection device of solar inverter
CN106080207B (en) Hand over the guard method of orthogonal circuit ground and diesel generating set, locomotive
CN104730407B (en) A kind of grounded inspection circuit
CN109444659A (en) Annular DC distribution net fault detection method based on voltage prediction
CN103926451A (en) Extracting method of reference voltage of dynamic voltage restorer in isolated neutral system
CN110171326A (en) Ground automatic neutral-section passing device and method
CN106159891A (en) DC drive Main Circuit of Diesel Locomotive earthing protecting method
CN1858953A (en) Protective method for zero sequence power direction based on local zero sequence compensation
CN203249968U (en) A real-time detecting circuit for detecting the earth insulation impedance of a photovoltaic grid-connected inverter
CN111864703B (en) Device and method for realizing direct-current networking of ship electric propulsion system
CN103770650B (en) Locomotive traction and aid system Integral grounding protection device
CN104931840B (en) A kind of transformer neutral point DC current restraining device tests system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant