CN205829132U - A kind of LCU protection circuit of electric locomotive - Google Patents
A kind of LCU protection circuit of electric locomotive Download PDFInfo
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- CN205829132U CN205829132U CN201620820303.2U CN201620820303U CN205829132U CN 205829132 U CN205829132 U CN 205829132U CN 201620820303 U CN201620820303 U CN 201620820303U CN 205829132 U CN205829132 U CN 205829132U
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Abstract
This utility model is related to protection of circuit field; disclose the LCU protection circuit of a kind of electric locomotive; one termination LCU (15) of described LCU protection circuit; the auxiliary winding of another termination main transformer (1); the auxiliary winding of described main transformer (1) connects auxiliary circuit (2); thus described auxiliary winding can carry alternating current to this auxiliary circuit (2), described LCU protection circuit include control switch module (5), protective unit and first diode branch (3) of series connection.The alternating current power supply that the technique scheme that this utility model provides can prevent main transformer from exporting scurries into LCU so that it is scaling loss occurs, improves the functional reliability of LCU protection circuit.
Description
Technical field
This utility model relates to a kind of protection circuit, in particular it relates to the LCU protection circuit of a kind of electric locomotive.
Background technology
The primary side winding of the main transformer of electric locomotive (such as SS4B type electric locomotive) is passed through and primary side winding series connection
Main circuit breaker is connected with contact net, and its auxiliary winding is connected with auxiliary circuit, for powering for auxiliary circuit.In order to auxiliary electricity
Road carries out ground protection, is provided with auxiliary ground protection circuit between auxiliary winding and the auxiliary circuit of main transformer.This auxiliary ground connection
Protection circuit belongs to electrical source protecting equipment, and it includes logic control element, and (Logical Control Unit is hereinafter referred to as
LCU) and LCU protection circuit, LCU exportable 110V unidirectional current, is used for detecting auxiliary circuit to auxiliary circuit through LCU protection circuit
Whether having earth point, when auxiliary circuit has earth point, LCU disconnects main circuit breaker, makes main transformer stop as auxiliary circuit and supplies
Electricity, plays ground protection effect.
Under contact net rated voltage 25KV, the auxiliary winding rated voltage of main transformer is AC399.86V, due to railway
Contact net net voltage fluctuation is big, actual contact net net press excursion between 22-29KV, the auxiliary winding of corresponding main transformer
The alternating voltage of output fluctuates between 380V-470V, and owing to existing LCU protecting circuit designed is unreasonable, reliability is poor,
Under long-term work state, its diode branch easily produces breakdown accident, and once diode branch punctures, main transformer
Auxiliary winding output High Level AC Voltage will directly scurry into LCU, by scaling loss such as the power panel in LCU, plug and circuits, lead
Cause whole locomotive and lose pull strength, cause locomotive to rescue, have a strong impact on the safe operation of locomotive, and change and repair LCU cost
Higher, simultaneously need to the substantial amounts of time, cause locomotive inspection and repair workload to increase, locomotive efficiency reduces.
Utility model content
The purpose of this utility model is to provide the LCU protection circuit of a kind of electric locomotive, is used for preventing main transformer from exporting
Alternating current power supply scurry into LCU so that it is occur scaling loss.
To achieve these goals, this utility model provides the LCU protection circuit of a kind of electric locomotive.Described LCU protects
One termination LCU of circuit, the auxiliary winding of another termination main transformer, the auxiliary winding of described main transformer connects auxiliary electricity
Road, thus described auxiliary winding can carry alternating current to this auxiliary circuit, described LCU protection circuit includes that the control of series connection is opened
Close module, protective unit and the first diode branch, described control switch module for when described auxiliary circuit ground connection to
Described LCU transmits auxiliary ground signalling, and described first diode branch is scurried into for the alternating current stoping described main transformer to export
Described LCU, described protective unit is for stoping described main transformer defeated when described first diode branch generation breakdown fault
Described LCU scurried into by the alternating current gone out.
Preferably, described protective unit includes protection switch, one end of described protection switch and described control switch module
Connecting, the other end is connected with described LCU, and described protection switch can occur to disconnect when overload or short circuit by the circuit at place.
Preferably, described protective unit includes the second diode branch and protection switch, described second diode branch
Negative electrode is connected with described first diode branch, and its anode is connected with one end of described control switch module, described protection switch
One end be connected with described LCU, its other end is connected with the other end of described control switch module, and described protection switch can be
The circuit at place occurs to disconnect when overload or short circuit.
Preferably, described control switch module includes auxiliary grounding relay and switch module diode branch, described auxiliary connects
Ground relay includes first coil and the first normally opened auxiliary contact, and described first coil is with described switch module diode branch also
Connection and one end of this first coil are connected with one end of described first normally opened auxiliary contact, and the other end is with described protection switch even
Connect, the other end ground connection of described first normally opened auxiliary contact；The anode of described switch module diode branch is first normal with described
Opening auxiliary contact to connect, its negative electrode is connected with described protection switch.
Preferably, described switch module diode branch includes the diode that at least two is connected.
Preferably, described LCU protection circuit also includes that current-limiting protection unit, described auxiliary grounding relay also include that first is normal
Closing auxiliary contact, one end of described current-limiting protection unit is connected with the first diode branch, and the other end is connected with auxiliary circuit, with
The electric current of first coil can be flowed through in auxiliary circuit ground connection limit；Described first normally closed auxiliary contact and described current-limiting protection
Unit is in parallel.
Preferably, described LCU protection circuit also includes audio alert unit and switchs teamwork with described protection
Auxiliary contact, described auxiliary contact is connected with audio alert unit and is formed audio alert branch road, one end of this audio alert branch road
Ground connection, another terminates the outfan of described LCU；During described protection switch Guan Bi, described auxiliary contact disconnects, described protection switch
During disconnection, described auxiliary contact closes.
Preferably, described LCU protection circuit also includes auxiliary reclay and switchs the auxiliary of teamwork with described protection
Help contact；Described auxiliary reclay includes auxiliary reclay coil, normally closed interlock unit and normally open contact unit；Described auxiliary is touched
Head and auxiliary reclay coils connected in series formation contact coils connected in series branch road, one end ground connection of this contact coils connected in series branch road, another
Terminating the outfan of described LCU, described normally closed interlock unit is serially connected between control switch module and the first diode branch；
Described normally open contact unit include normally opened auxiliary contact A and normally opened auxiliary contact B, described normally opened auxiliary contact A with
The series connection of diode branch A forms contact Diode series branch road, and one end of this contact Diode series branch road is with the described 1st
The negative electrode of pole pipe branch road connects, and the other end connects with normally closed interlock unit and the connection end controlling switch module；Described normally opened auxiliary
Help contact B and protection switch in parallel；LCU scurried into by the alternating current that described diode branch A can stop main transformer to export.
Preferably, described protective unit includes the second diode branch, and the negative electrode of described second diode branch is with described
First diode branch connects, and its anode is connected with described control switch module.
Preferably, described control switch module includes auxiliary grounding relay and switch module diode branch, described auxiliary connects
Ground relay includes first coil and the first normally opened auxiliary contact, and described first coil is with described switch module diode branch also
Connection, one end of described first coil is connected with one end of described first normally opened auxiliary contact, and the other end is connected with LCU, and described the
The other end ground connection of one normally opened auxiliary contact；The anode of described switch module diode branch and described first normally opened auxiliary contact
Connecting, its negative electrode is connected with described LCU.
Preferably, described LCU protection circuit also includes fault isolator, and described fault isolator can be at auxiliary electricity
When road occurs the earth fault that can not get rid of, cut off described LCU protection circuit.
The technical scheme that this utility model provides has the advantages that
The LCU protection circuit that this utility model provides includes control switch module, protective unit and the one or two of series connection
Pole pipe branch road, described protective unit can stop described main transformer defeated when described first diode branch generation breakdown fault
Described LCU scurried into by the alternating current gone out, it is therefore possible to prevent LCU and line thereof described in the alternating current power supply scaling loss of described main transformer output
Road, improves security and stability and the operation efficiency of electric locomotive that electric locomotive runs, greatly reduces locomotive operation
This.
Other features and advantages of the utility model will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to offer and is further appreciated by of the present utility model, and constitutes a part for description, with following
Detailed description of the invention be used for explaining this utility model together, but be not intended that restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram of this utility model wherein LCU protection circuit that an embodiment provides；
Fig. 2 is the schematic diagram of the LCU protection circuit that another embodiment of this utility model provides；
Fig. 3 is the schematic diagram of the LCU protection circuit that the another embodiment of this utility model provides；
Fig. 4 is the schematic diagram of the LCU protection circuit that this utility model another embodiment provides；
Description of reference numerals
1-main transformer；2-auxiliary circuit；3-the first diode branch；4-the second diode branch；5-controls switching molding
Block；6-diode；7-switch module diode branch；8-diode；The normally opened auxiliary contact of 9-first；10-first coil；11-
Protection switch；12-auxiliary contact A；13-audio alert unit；14-auxiliary contact B；15-LCU；16-auxiliary reclay coil；
17-normally opened auxiliary contact B；18-normally closed interlock unit；19-normally closed auxiliary contact A；20-normally closed auxiliary contact B；21-is normally opened auxiliary
Help contact A；22-diode branch A；23-resistance；The normally closed auxiliary contact of 24-first；25-electric capacity；26-fault isolator；
27-current-limiting protection unit.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.It should be appreciated that herein
Described detailed description of the invention is merely to illustrate and explains this utility model, is not limited to this utility model.
Referring to Fig. 1-Fig. 4, this utility model embodiment one provides the LCU protection circuit of a kind of electric locomotive, described LCU
One termination LCU 15 of protection circuit, the auxiliary winding of another termination main transformer 1, the auxiliary winding of described main transformer 1 is even
Connecing auxiliary circuit 2, thus described auxiliary winding can carry alternating current to this auxiliary circuit 2, described LCU protection circuit is connected
Time, described LCU 15 can carry unidirectional current to detect described auxiliary circuit 2 through LCU protection circuit to described auxiliary circuit 2 and be
No ground connection.Described LCU protection circuit includes control switch module 5, protective unit and the first diode branch 3, the institute of series connection
State control switch module 5 for when described auxiliary circuit 2 ground connection to described LCU15 transmit auxiliary ground signalling, the described 1st
Pole pipe branch road 3 scurries into described LCU 15 for the alternating current stoping described main transformer 1 to export, and described protective unit is in institute
Stating the first diode branch 3 occurs the alternating current stoping described main transformer 1 to export during breakdown fault to scurry into described LCU 15.
The operation principle of the above-mentioned LCU protection circuit that this utility model embodiment one provides is as follows:
(rising bow refers to rise the pantograph of locomotive to electric locomotive rising bow, by the single-phase alternating current from contact net, such as
25KV single-phase alternating current, introduce locomotive main transformer) or run, LCU 15 export unidirectional current (following conventional with 110V
It is described as a example by detection unidirectional current) whether there is earth point through LCU protection circuit detection auxiliary circuit 2.When auxiliary circuit 2 is without connecing
During place, the power supply output loop of LCU 15 is off, the first diode branch 3 auxiliary winding to main transformer 1
The High Level AC Voltage of output blocks, and prevents this High Level AC Voltage from scurrying into and scaling loss LCU 15.When auxiliary circuit 2 has earth point
Time, in an ON state, the 110V unidirectional current that LCU 15 is exported by the first diode branch 3 enters the power supply output loop of LCU 15
Row conducting, controls switch module 5 and transmits auxiliary ground signalling to LCU 15, between the primary side winding and contact net of main transformer 1
Being serially connected with main circuit breaker, this main circuit breaker can be controlled by LCU 15, concrete, controls switch module 5 when LCU 15 receives
Control main circuit breaker tripping operation during auxiliary ground signalling to turn off, cut off the out-put supply of main transformer 1, thus play auxiliary ground protection and make
With.Owing to the first diode branch 3 is chronically under " resistance is handed over " " logical straight " duty, material is the most tired, when the one or two pole
There is mass defect or during close to service life in pipe branch road 3, and the first diode branch 3 will necessarily puncture, and this type of accident is difficult to pre-
Anti-.The LCU protection circuit that this utility model embodiment one provides is provided with protective unit, this protective unit and control switch module
5 and first diode branch 3 connect, for when there is breakdown fault in the first diode branch 3 stop main transformer 1 output
Alternating current passes through, it is therefore possible to prevent the alternating current of main transformer 1 output scurries into LCU 15, scaling loss LCU 15 machine line, improves
Security and stability that electric locomotive runs and the operation efficiency of electric locomotive, greatly reduce locomotive operation cost.
In this utility model embodiment one, the structure of protective unit can have multiple, below in conjunction with this utility model embodiment
Two the first structure providing protective unit, and combine this first structure the specific works principle of protective unit is said
Bright.
Referring to Fig. 1, this utility model embodiment two provides the LCU protection circuit of a kind of electric locomotive, and this LCU protects electricity
Lu Zhong, described protective unit includes protecting switch 11, one end of described protection switch 11 to be connected with described control switch module 5,
The other end is connected with described LCU 15, and described protection switch 11 can occur to disconnect when overload or short circuit by the circuit at place.?
During specific embodiment, protection switch 11 can be that one pole switchs automatically.It is that a kind of collection electromagnetic protection moves with heat that one pole switchs automatically
It is protected in the protection electrical equipment of one, there is overload and short-circuit protection function.In this utility model embodiment two, one pole switchs automatically
Action current can select as required, can be such as 10A, i.e. when flowing through electric current that this one pole switchs automatically more than 10A
Time, one pole automatically switchs and will automatically disconnect, thus cuts off LCU protection circuit, prevents the first diode branch 3 from breakdown fault occurring
Time, the High Level AC Voltage of main transformer 1 output is scurried into and scaling loss LCU 15.
Protective unit in this utility model embodiment one is in addition to can being the first structure above-mentioned, it is also possible to for following
The second structure, provide the second structure of protective unit below in conjunction with this utility model embodiment three, and combine this second
Plant structure the specific works principle of protective unit is illustrated.
Referring to Fig. 2, this utility model embodiment three provides the LCU protection circuit of a kind of electric locomotive, and this LCU protects electricity
Lu Zhong, described protective unit includes the second diode branch 4 and protection switch 11, the negative electrode of described second diode branch 4 with
Described first diode branch 3 connects, and its anode is connected with one end of described control switch module 5, described protection switch 11
One end is connected with described LCU 15, and its other end is connected with the other end of described control switch module 5, described protection switch 11 energy
Enough circuits at place occur to disconnect when overload or short circuit.The second structure of described protective unit is on the basis of the first structure
On add the second diode branch 4, when the first diode branch 3 occurs breakdown fault, by the second diode branch 4 to master
The High Level AC Voltage of transformator 1 output blocks, thus the High Level AC Voltage preventing main transformer 1 from exporting is scurried into and scaling loss
LCU15.When the first diode branch 3 and the second diode branch 4 all occur breakdown fault, by protection switch 11 cut-out LCU
Protection circuit, thus LCU 15 is protected.
In this utility model embodiment three, described second diode branch 4 can include a diode, it is also possible to includes
Two or more diodes, when the second diode branch 4 includes a diode, then this second diode branch 4
Negative electrode refer to the negative electrode of this diode, the anode of this second diode branch 4 refers to the anode of this diode；When second
When diode branch 4 includes multiple diode, the most the plurality of diode series aiding connection forms the second diode branch 4, and this is second years old
The negative electrode of diode that Diode series branch road two-end-point connects and anode are respectively as the negative electrode of the second diode branch 4 and sun
Pole.Such as, the anode that anode is diode 6 of Fig. 1 breaker in middle module diode branch 7, the moon of switch module diode branch 7
The extremely negative electrode of diode 8.It is anticipated that, in described second diode branch 4, the quantity of the diode of series connection is the most,
Its resistance friendship ability is the strongest, and reliability is the highest.
In this utility model embodiment one to embodiment three, the structure controlling switch module 5 can have multiple, is given below
Control the one of which structure of switch module 5, and combine its concrete structure its operation principle is illustrated.
Described control switch module 5 includes auxiliary grounding relay and switch module diode branch 7, described auxiliary ground connection relay
Device includes first coil 10 and the first normally opened auxiliary contact 9, and described first coil 10 is with described switch module diode branch 7 also
Connection and one end of this first coil 10 are connected with one end of described first normally opened auxiliary contact 9, the other end and described protection switch
11 connect, the other end ground connection (this ground refers to car body ground) of described first normally opened auxiliary contact 9；Described switch module diode
The anode of branch road 7 is connected with described first normally opened auxiliary contact 9, and its negative electrode is connected with described protection switch 11.
When auxiliary circuit 2 is unearthed, the power supply output loop of LCU 15 is off, and first coil 10 is obstructed
Electricity, the first normally opened auxiliary contact 9 disconnects.When auxiliary circuit 2 ground connection, the power supply output loop of LCU 15 is connected, first coil
10 energisings, the first normally opened auxiliary contact 9 closes, and when the first normally opened auxiliary contact 9 closes, the normally opened auxiliary contact linked with it is also
Can close, this normally opened auxiliary contact not shown in figure, this normally opened auxiliary contact is connected with LCU 15, thus LCU 15 can detect
Its closure signal, and judge whether auxiliary circuit occurs auxiliary earth fault according to its closure signal；LCU 15 has been internally integrated can
Control switch, this gate-controlled switch is connected with main circuit breaker, when LCU 15 judges that auxiliary circuit occurs auxiliary earth fault, can be by control
Make its internal gate-controlled switch and turn off to control main circuit breaker tripping operation, thus play auxiliary ground protection effect.It should be noted that
This normally opened auxiliary contact can be the normally opened auxiliary contact that auxiliary grounding relay carries.
The effect controlling to arrange in switch module 5 switch module diode branch 7 is: when there is auxiliary earth fault, the
Having electric current to flow through in one coil 10, the first normally opened auxiliary contact 9 closes, and first coil 10 two ends can produce induction electromotive force, by
Can be typically an inductance coil in first coil 10, so can produce bigger the most electric when first coil 10 power-off discharges
Other electric elements in LCU 15 and LCU 15 are produced backward voltage by pressure (induction electromotive force), when backward voltage is higher than electricity
During the breakdown reverse voltage of device element, will result in the damage of LCU 15 and other electric elements.In order to eliminate this overvoltage
Impact, in the two ends paralleling switch module diode branch 7 of first coil 10, can form fly-wheel diode discharge loop, pass through
The induction electric that the loop that switch module diode branch 7 and first coil 10 are constituted produces when first coil 10 power-off being discharged
Gesture consumes, thus protects the safety of LCU 15 and other electric elements.It addition, by the sun of switch module diode branch 7
Extremely connect with the connection end of first coil 10 and the first normally opened auxiliary contact 9, by the negative electrode of switch module diode branch 7 with the
The other end of one coil 10 connects, and can play the function of reversely cut-off, when preventing auxiliary earth fault, LCU 15 output
110V unidirectional current is short-circuited accident through the earth loop that switch module diode branch 7 is connected with the first normally opened auxiliary contact 9.
In the said structure controlling switch module 5, switch module diode branch 7 can include a diode, also
Multiple diode can be included, in order to improve the reverse cut-off effect of switch module diode branch 7 further, it is preferred that institute
State the diode that switch module diode branch 7 includes that at least two is connected.Such as, the switch module diode branch 7 in Fig. 1
It is composed in series by diode 6 and diode 8.Under normal circumstances, diode 8 is devoted oneself to work, and the 110V blocking LCU 15 output is straight
Stream electricity, is prevented LCU 15 to be connected by the first normally opened auxiliary contact 9 and car body, when diode 8 punctures, throws diode 6
Enter work, block the 110V unidirectional current of LCU 15 output, so, the functional reliability of switch module diode branch 7 can be improved.
Refer to Fig. 3, when auxiliary circuit 2 ground connection, for the big electric current scaling loss first coil 10 preventing LCU 15 from exporting,
This utility model embodiment four provides the LCU protection circuit of a kind of electric locomotive, and this LCU protection circuit is in embodiment one to enforcement
On the basis of any one embodiment in example three, still further comprising current-limiting protection unit 27, meanwhile, auxiliary grounding relay also wraps
Including the first normally closed auxiliary contact 24, one end of described current-limiting protection unit 27 is connected with the first diode branch 3, and the other end is with auxiliary
Circuit 2 is helped to connect, can flow through the electric current of first coil 10 in auxiliary circuit 2 ground connection limit；Described first normally closed auxiliary
Contact 24 is in parallel with described current-limiting protection unit 27.When auxiliary circuit 2 is unearthed, the first normally closed auxiliary contact 24 closes, LCU
15 output 110V unidirectional currents detect auxiliary circuit 2 whether ground connection through the first normally closed auxiliary contact 24, when auxiliary circuit 2 ground connection,
First normally closed auxiliary contact 24 disconnects, and current-limiting protection unit 27 accesses, and limits the electric current flowing through first coil 10；Concrete, institute
Stating current-limiting protection unit 27 to be composed in parallel by resistance 23 and electric capacity 25, wherein, resistance 23 is current-limiting resistance, is used for limiting LCU
The electric current of protection circuit, electric capacity 25 is filter capacitor, can be when auxiliary circuit ground connection, to the interference electric current in LCU output electric current
It is filtered so that it is output electric current is more steady, so that the adhesive action of the normally open contact of auxiliary grounding relay more may be used
Lean on, improve the reliability of LCU protection circuit.
When LCU protection circuit occurred stream, in order to point out over current fault, this utility model embodiment five to staff
There is provided the LCU protection circuit of a kind of electric locomotive, any one enforcement in embodiment two to embodiment four of this LCU protection circuit
On the basis of example, still further comprise audio alert unit 13 and the auxiliary contact with described protection switch 11 teamworks
12,14, described auxiliary contact 12,14 is connected with audio alert unit 13 and is formed audio alert branch road, this audio alert branch road
One end ground connection, another terminates the outfan of described LCU 15；During described protection switch 11 Guan Bi, described auxiliary contact 12,14 breaks
Opening, during described protection switch 11 disconnection, described auxiliary contact 12,14 closes.Wherein, audio alert unit 13 can use buzzer
Or other phonetic alarm devices, by technique scheme, when there is not stream in LCU protection circuit, protection switch 11 Guan Bi, auxiliary
Helping contact 12,14 disconnect, and buzzer does not works；When LCU protection circuit occurred conductance to cause protection switch 11 disconnection, auxiliary is touched
12,14 Guan Bis, audio alert branch road is energized, and buzzer rings, and points out over current fault to staff.It should be noted that institute
Stating auxiliary contact 12,14 can be that one pole switchs two auxiliary contacts carried automatically.
Refer to Fig. 3, in order to improve the functional reliability of described LCU protection circuit further, prevent above-mentioned LCU protection electricity
Break down cisco unity malfunction on road, causes LCU 15 can not carry out auxiliary earthing detection, and this utility model embodiment six provides one
Plant the LCU protection circuit of electric locomotive, this LCU protection circuit basis of any one embodiment in embodiment two to embodiment five
On, still further comprise auxiliary reclay；Described auxiliary reclay includes auxiliary reclay coil 16, normally closed interlock unit 18 and
Normally open contact unit；When being embodied as, this auxiliary reclay such as can use JZ15-44Z type auxiliary reclay.
Described auxiliary contact 12,14 is connected with auxiliary reclay coil 16 and is formed contact coils connected in series branch road, this contact line
One end ground connection of circle series arm, the outfan of the described LCU 15 of another termination, described normally closed interlock unit 18 is serially connected in control
Between switch module 5 and the first diode branch 3；Concrete, when protective unit includes the second diode branch 4, normally closed tactile
One end of head unit 18 is connected with controlling switch module 5, and the anode of the other end and the second diode branch 4 connects；When protection is single
When unit does not includes the second diode branch 4, one end of normally closed interlock unit 18 is connected with controlling switch module 5, the other end and the
The anode of one diode branch 3 connects.
Described normally open contact unit includes normally opened auxiliary contact A 21 and normally opened auxiliary contact B 17, and described normally opened auxiliary is touched
Head A 21 connects with diode branch A 22 and forms contact Diode series branch road, and one end of this contact Diode series branch road is same
The negative electrode of described first diode branch 3 connects, and the other end connects with normally closed interlock unit 18 and the connection end controlling switch module 5
Connect；Described normally opened auxiliary contact B 17 is in parallel with protection switch 11；
The anode of described diode branch A 22 is connected with normally opened auxiliary contact A 21, its negative electrode and the first diode branch
The negative electrode of 3 connects, and so, LCU 15 scurried into by the alternating current that described diode branch A 22 can stop main transformer 1 to export.
When LCU protection circuit normally works, described LCU 15 is by being touched by protection switch 11 first coils 10 are normally closed
Head unit 18 second diode branch 4 (when protective unit is without the second diode branch 4, deletes the second diode herein
Branch road 4) the first normally closed auxiliary contact of diode branch 3 first 24 (continues when not using above-mentioned current-limiting protection unit, auxiliary ground connection
When electrical equipment does not includes the first normally closed auxiliary contact 24, delete the first normally closed auxiliary contact 24 herein) the first circuit of forming is even
It is connected to auxiliary circuit 2, so that 110V unidirectional current can be carried to detect auxiliary circuit 2 whether ground connection to auxiliary circuit 2.When occurring two
Pole pipe breakdown fault, when causing the first above-mentioned circuit that stream occurred, protection switch 11 disconnection, auxiliary contact 12,14 Guan Bis, in
Between relay coil 16 electric, normally closed interlock unit 18 disconnects, and normally opened auxiliary contact A 21 and normally opened auxiliary contact B 17 closes,
LCU 15 is by by normally opened auxiliary contact B17 first coil 10 normally opened auxiliary contact A 21 diode branch A 22 the
One normally closed auxiliary contact 24 (does not include the first normally closed auxiliary contact when not using above-mentioned current-limiting protection unit, auxiliary grounding relay
When 24, delete the first normally closed auxiliary contact 24 herein) second circuit that forms is connected to auxiliary circuit 2, with can be to auxiliary
Circuit 2 carries 110V unidirectional current to detect auxiliary circuit 2 whether ground connection.The technical scheme that this utility model embodiment six provides,
Can be automatically switched on second circuit when the first circuit malfunctions, second circuit the auxiliary earthing detection of LCU 15 is provided
Loop, crew is not required to do any process, and locomotive can continue properly functioning, improves the functional reliability of LCU protection circuit.
In this utility model embodiment six, normally closed interlock unit 18 can include a normally closed auxiliary contact, it is also possible to bag
Include the normally closed auxiliary contact of more than one pair of parallel connection, in order to improve the functional reliability of auxiliary reclay, auxiliary reclay normal
Closing contact unit 18 to be composed in parallel by the normally closed auxiliary contact of at least two, the most in the diagram, normally closed interlock unit 18 is by often
Close auxiliary contact A 19 and normally closed auxiliary contact B 20 to compose in parallel, so, when one of them normally closed auxiliary contact loose contact
Time, another normally closed auxiliary contact connect power supply, to increase the reliability of LCU protection circuit.When LCU protection circuit occurred
During stream, normally closed auxiliary contact A 19 and normally closed auxiliary contact B 20 disconnects, and cuts off the High Level AC Voltage of main transformer 1 output, right
LCU 15 and LCU protection circuit is protected.
In this utility model embodiment six, diode branch A 22 in second circuit plays and the first diode branch 3
Identical " logical straight " " resistance is handed over " effect, this diode branch A 22 can include a diode, it is also possible to includes two or two
The diode of individual above series aiding connection, it is anticipated that, the quantity of the diode of series connection is the most, and its resistance friendship ability is the strongest, can
The highest by property.
Protective unit in this utility model embodiment one is except being the first structure aforesaid or the second structure
Outward, it is also possible to for the third structure, provide the third structure of described protective unit below in conjunction with this utility model embodiment seven,
And combine this third structure the operation principle of protective unit is illustrated.
Referring to Fig. 4, this utility model embodiment seven provides the LCU protection circuit of a kind of electric locomotive, and this LCU protects electricity
Lu Zhong, described protective unit includes the second diode branch 4, the negative electrode of described second diode branch 4 and described one or two pole
Pipe branch road 3 connects, and its anode is connected with described control switch module 5.So, there is breakdown fault when the first diode branch 3
Time, described second diode branch 4 devotes oneself to work, and the alternating current power supply preventing main transformer 1 from exporting is scurried into and scaling loss LCU 15.
In this utility model embodiment seven, the structure of described control switch module 5 and embodiment one to embodiment six are controlled
The structure of switch module 5 processed is essentially identical, particularly as follows:
Described control switch module 5 includes auxiliary grounding relay and switch module diode branch 7, described auxiliary ground connection relay
Device includes first coil 10 and the first normally opened auxiliary contact 9, and described first coil 10 is with described switch module diode branch 7 also
Connection, one end of described first coil 10 is connected with one end of described first normally opened auxiliary contact 9, and the other end is connected with LCU 15,
The other end ground connection of described first normally opened auxiliary contact 9；The anode of described switch module diode branch 7 is first normally opened with described
Auxiliary contact 9 connects, and its negative electrode is connected with described LCU 15.
In this utility model embodiment seven, the function controlling switch module 5 controls to open in embodiment one to embodiment six
The function closing module 5 is essentially identical, and here is omitted.
The earth fault can not got rid of to prevent auxiliary circuit 2 from occurring, this utility model embodiment eight provides a kind of electricity
The LCU protection circuit of power locomotive, the basis of this LCU protection circuit any one embodiment in embodiment one to embodiment seven
On, still further comprising fault isolator 26, one end of described fault isolator 26 connects auxiliary circuit 2, and the other end is even
Connect current-limiting protection unit (need specified otherwise, when LCU protection circuit does not includes flow-restriction, fault isolator 26
The other end connect the negative electrode of the first diode branch).When staff finds that auxiliary circuit 2 ground connection and earth point cannot be got rid of
Time, the most manual open failure disconnecting switch 26, cut off LCU protection circuit, now, locomotive does failure operation, it is desirable to staff
Look over one's shoulder the duty of each subsidiary engine in auxiliary circuit 2, it is ensured that safety.
Preferred implementation of the present utility model is described in detail above in association with accompanying drawing, but, this utility model does not limit
Detail in above-mentioned embodiment, in technology concept of the present utility model, can be to skill of the present utility model
Art scheme carries out multiple simple variant, and these simple variant belong to protection domain of the present utility model.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, at not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, this utility model is to respectively
Plant possible compound mode to illustrate the most separately.
Additionally, combination in any can also be carried out, as long as it is not disobeyed between various different embodiment of the present utility model
Carrying on the back thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (11)
1. a LCU protection circuit for electric locomotive, termination LCU (15) of described LCU protection circuit, another terminates main transformer pressure
The auxiliary winding of device (1), the auxiliary winding of described main transformer (1) connects auxiliary circuit (2), thus described auxiliary winding can
Alternating current is carried to this auxiliary circuit (2), it is characterised in that
Described LCU protection circuit includes control switch module (5), protective unit and first diode branch (3) of series connection,
Described control switch module (5) is for transmitting auxiliary ground signalling, institute when described auxiliary circuit (2) ground connection to described LCU (15)
State the alternating current that the first diode branch (3) is used for stoping described main transformer (1) to export and scurry into described LCU (15), described anti-
Protect unit for the exchange stoping described main transformer (1) to export when described first diode branch (3) occurs breakdown fault
Electricity scurries into described LCU (15).
The LCU protection circuit of electric locomotive the most according to claim 1, it is characterised in that
Described protective unit includes protection switch (11), one end of described protection switch (11) and described control switch module (5)
Connecting, the other end is connected with described LCU (15), and described protection switch (11) can circuit at place when occurring to transship or be short-circuit
Disconnect.
The LCU protection circuit of electric locomotive the most according to claim 1, it is characterised in that
Described protective unit includes the second diode branch (4) and protection switch (11), the moon of described second diode branch (4)
Pole is connected with described first diode branch (3), and its anode is connected with one end of described control switch module (5), described protection
One end of switch (11) is connected with described LCU (15), and its other end is connected with the other end of described control switch module (5), institute
State protection switch (11) can occur to disconnect when overload or short circuit by the circuit at place.
4. according to the LCU protection circuit of the electric locomotive described in Claims 2 or 3, it is characterised in that described control switch module
(5) include auxiliary grounding relay and switch module diode branch (7), described auxiliary grounding relay include first coil (10) and
First normally opened auxiliary contact (9), described first coil (10) is in parallel with described switch module diode branch (7) and this First Line
One end of circle (10) is connected with one end of described first normally opened auxiliary contact (9), and the other end is connected with described protection switch (11),
The other end ground connection of described first normally opened auxiliary contact (9)；The anode and described first of described switch module diode branch (7)
Normally opened auxiliary contact (9) connects, and its negative electrode is connected with described protection switch (11).
The LCU protection circuit of electric locomotive the most according to claim 4, it is characterised in that
Described switch module diode branch (7) includes the diode that at least two is connected.
The LCU protection circuit of electric locomotive the most according to claim 5, it is characterised in that described LCU protection circuit is also wrapped
Including current-limiting protection unit (27), described auxiliary grounding relay also includes the first normally closed auxiliary contact (24), described current-limiting protection list
One end of unit (27) is connected with the first diode branch (3), and the other end is connected with auxiliary circuit (2), with can be at auxiliary circuit
(2) ground connection limit flows through the electric current of first coil (10)；Described first normally closed auxiliary contact (24) and described current-limiting protection list
Unit (27) is in parallel.
7. according to the LCU protection circuit of the electric locomotive described in Claims 2 or 3, it is characterised in that described LCU protection circuit
Also include audio alert unit (13) and the auxiliary contact (12,14) with described protection switch (11) teamwork, described auxiliary
Help contact (12,14) to connect with audio alert unit (13) and form audio alert branch road, one end ground connection of this audio alert branch road,
Another terminates the outfan of described LCU (15)；During described protection switch (11) Guan Bi, described auxiliary contact (12,14) disconnects, institute
When stating protection switch (11) disconnection, described auxiliary contact (12,14) closes.
8. according to the LCU protection circuit of the electric locomotive described in Claims 2 or 3, it is characterised in that described LCU protection circuit
Also include auxiliary reclay and the auxiliary contact (12,14) with described protection switch (11) teamwork；Described middle relay
Device includes auxiliary reclay coil (16), normally closed interlock unit (18) and normally open contact unit；
Described auxiliary contact (12,14) is connected with auxiliary reclay coil (16) and is formed contact coils connected in series branch road, this contact line
One end ground connection of circle series arm, the outfan of another the described LCU of termination (15), described normally closed interlock unit (18) is serially connected in control
Between switch module processed (5) and the first diode branch (3)；
Described normally open contact unit includes normally opened auxiliary contact A (21) and normally opened auxiliary contact B (17), described normally opened auxiliary contact
A (21) connects with diode branch A (22) and forms contact Diode series branch road, and one end of this contact Diode series branch road is same
The negative electrode of described first diode branch (3) connects, and the other end is with normally closed interlock unit (18) and the company controlling switch module (5)
Connect end to connect；Described normally opened auxiliary contact B (17) is in parallel with protection switch (11)；Described diode branch A (22) can stop
LCU scurried into by the alternating current that main transformer (1) exports.
The LCU protection circuit of electric locomotive the most according to claim 1, it is characterised in that
Described protective unit includes the second diode branch (4), the negative electrode and the described 1st of described second diode branch (4)
Pole pipe branch road (3) connects, and its anode is connected with described control switch module (5).
The LCU protection circuit of electric locomotive the most according to claim 9, it is characterised in that
Described control switch module (5) includes auxiliary grounding relay and switch module diode branch (7), described auxiliary ground connection relay
Device includes first coil (10) and the first normally opened auxiliary contact (9), described first coil (10) and described switch module diode
Branch road (7) is in parallel, and one end of described first coil (10) is connected with one end of described first normally opened auxiliary contact (9), the other end
It is connected with LCU (15), the other end ground connection of described first normally opened auxiliary contact (9)；Described switch module diode branch (7)
Anode is connected with described first normally opened auxiliary contact (9), and its negative electrode is connected with described LCU (15).
The LCU protection circuit of 11. electric locomotives according to claim 1, it is characterised in that described LCU protection circuit is also
Including fault isolator (26), the ground connection that described fault isolator (26) can not be able to be got rid of in auxiliary circuit (2) generation
During fault, cut off described LCU protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620820303.2U CN205829132U (en) | 2016-07-29 | 2016-07-29 | A kind of LCU protection circuit of electric locomotive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620820303.2U CN205829132U (en) | 2016-07-29 | 2016-07-29 | A kind of LCU protection circuit of electric locomotive |
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| CN205829132U true CN205829132U (en) | 2016-12-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038490A (en) * | 2018-07-05 | 2018-12-18 | 中车洛阳机车有限公司 | The auxiliary ground fault of locomotive quickly isolates device |
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2016
- 2016-07-29 CN CN201620820303.2U patent/CN205829132U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038490A (en) * | 2018-07-05 | 2018-12-18 | 中车洛阳机车有限公司 | The auxiliary ground fault of locomotive quickly isolates device |
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