Train power supply assembly
阅读说明：本技术 列车供电组件 (Train power supply assembly ) 是由 于保华 常城 彭旭 于 2021-11-04 设计创作，主要内容包括：本公开涉及一种列车供电组件,包括：变压器,具有初级绕组和次级绕组,初级绕组与铁路接触网连接,次级绕组具有第一输出端和第二输出端；供电电路,包括：供电支路,包括第一开关和车端连接器,第一开关具有第一接线端、第二接线端、开关信号输出端和第一控制端,第一接线端与第一输出端连接,第二接线端与车端连接器连接,车端连接器用于向列车输出电流；回流支路的一端连接第二输出端,另一端接地；滤波组件,具有第一电阻和第一电容组,第一电容组具有至少两个相互串联的第一电容,第一电阻的第一端与第一接线端连接,第一电阻的第二端与第一电容的第一端连接,第一电容组的第二端接地。该列车供电组件可以单线供电,并能够向列车输出交流电。(The present disclosure relates to a train power supply assembly, including: the transformer is provided with a primary winding and a secondary winding, the primary winding is connected with a railway contact network, and the secondary winding is provided with a first output end and a second output end; a power supply circuit comprising: the power supply branch comprises a first switch and a vehicle-side connector, the first switch is provided with a first wiring end, a second wiring end, a switch signal output end and a first control end, the first wiring end is connected with the first output end, the second wiring end is connected with the vehicle-side connector, and the vehicle-side connector is used for outputting current to a train; one end of the backflow branch is connected with the second output end, and the other end of the backflow branch is grounded; the filter component is provided with a first resistor and a first capacitor bank, the first capacitor bank is provided with at least two first capacitors which are connected in series, the first end of the first resistor is connected with the first terminal, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor bank is grounded. The train power supply assembly can be powered by a single wire and can output alternating current to a train.)
1. A train power supply assembly, comprising:
a transformer having a primary winding and a secondary winding, the primary winding being connected to a railroad catenary, the secondary winding having a first output and a second output;
a power supply circuit, the power supply circuit comprising:
the power supply branch comprises a first switch and a train end connector, the first switch is provided with a first wiring end, a second wiring end, a switch signal output end and a first control end, the first wiring end is connected with the first output end, the second wiring end is connected with the train end connector, and the train end connector is used for outputting current to the train;
one end of the backflow branch is connected with the second output end, and the other end of the backflow branch is grounded;
the filter assembly is provided with a first resistor and a first capacitor bank, the first capacitor bank is provided with at least two first capacitors which are connected in series, the first end of the first resistor is connected with the first terminal, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor bank is grounded.
2. The train power supply assembly of claim 1 wherein the filter assembly further comprises:
the second capacitor bank is provided with at least two second capacitors which are connected in series, the first end of the second resistor is connected with the first end of the first resistor, the second end of the second resistor is connected with the first end of the second capacitor bank, the second end of the second capacitor bank is connected with the second end of the first capacitor bank, and the second end of the first resistor is connected with the second end of the second resistor.
3. The train power supply assembly of claim 1,
the power supply branch further comprises: a first isolation switch having a third terminal and a fourth terminal, the third terminal connected to the first output terminal, the fourth terminal connected to the first terminal and to a first end of the first resistor;
the return branch includes: a second isolation switch having a fifth terminal and a sixth terminal, the fifth terminal connected to the second output terminal, the sixth terminal connected to the second terminal of the first capacitor bank.
4. The train power supply assembly of claim 3, wherein the first and second isolation switches are the same isolation switch, the isolation switch having a first connection end, a second connection end, a third connection end, and a fourth connection end, the first connection end being connected to the first output end, the second connection end being connected to the first connection end and to the first end of the first resistor, the third connection end being connected to the second output end, and the fourth connection end being connected to the second end of the first capacitor bank.
5. The train power supply assembly of claim 1 further comprising a voltage transformer located at the primary winding; the power supply circuit further includes:
a first end of the current transformer is connected with a second end of the first capacitor bank and the sixth terminal, and a second end of the current transformer is grounded;
the kilowatt-hour meter, the kilowatt-hour meter has first input, second input and third input, first input with current transformer's first end is connected, the second input with current transformer's second end is connected, the third input with voltage transformer connects.
6. The train power supply assembly of claim 3,
the power supply branch further comprises: the first fuse is positioned between the first output end and the first isolating switch, one end of the first fuse is connected with the first output end, and the other end of the first fuse is connected with the third wiring end;
the return branch further comprises: the second fuse, the second fuse is located the second output with between the second isolator, just the one end of second fuse with the second output is connected, the other end of second fuse with the fifth wiring end is connected.
7. The train power supply assembly of claim 6, wherein the power branch further comprises:
the current sensor is provided with a current input end, a current output end and a current signal output end, the current input end is connected with the fourth wiring end, and the current output end is connected with the first wiring end and the first end of the first resistor;
a voltage sensor having a first voltage input, a second voltage input, and a voltage signal output, the first voltage input connected with the fourth terminal, the second voltage input connected with the sixth terminal.
8. The train power supply assembly of claim 7, further comprising:
a control module, control module has current signal input, voltage signal input, first state signal input, second state signal input, third state signal input and first control signal output, current signal input with current signal output connects, voltage signal input with voltage signal output connects, first state signal input with first fuse with the second fuse is connected, second state signal input with first isolator with second isolator connects, third state input with switch signal output connects, first control signal output with first control end connects.
9. The train power supply assembly of claim 8, further comprising:
and the input end of the power supply control relay is connected with the first control signal output end, and the output end of the power supply control relay is connected with the first control end.
10. The train power supply assembly of claim 9 wherein the train has a main off control loop including at least a first control switch for controlling the switching of the primary winding of the transformer, the control module further comprising: a second control signal output, the train power supply assembly further comprises:
and the input end of the main off control relay is connected with the second control signal output end, and the control output end of the main off control relay is at least connected with the first control switch so as to be used for controlling the opening and closing of the first control switch.
Technical Field
The utility model relates to a train manufacturing technology field especially relates to a train power supply subassembly.
Background
At present, trains in the field all adopt a two-wire power supply system, and train power supply components all adopt a mode that a train power supply cabinet is connected into a traction transformer winding, and power is supplied through a rectifying device in the cabinet to generate direct current so as to supply power to the trains.
Therefore, in order to meet the needs of a specific train, it is urgently needed to develop a train power supply assembly which can supply power by adopting a single line and can output alternating current to the train.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The train power supply assembly can adopt single-wire power supply and can output alternating current to a train.
The present disclosure provides a train power supply assembly, including:
a transformer having a primary winding and a secondary winding, the primary winding being connected to a railroad catenary, the secondary winding having a first output and a second output;
a power supply circuit, the power supply circuit comprising:
the power supply branch comprises a first switch and a train end connector, the first switch is provided with a first wiring end, a second wiring end, a switch signal output end and a first control end, the first wiring end is connected with the first output end, the second wiring end is connected with the train end connector, and the train end connector is used for outputting current to the train;
one end of the backflow branch is connected with the second output end, and the other end of the backflow branch is grounded;
the filter assembly is provided with a first resistor and a first capacitor bank, the first capacitor bank is provided with at least two first capacitors which are connected in series, the first end of the first resistor is connected with the first terminal, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor bank is grounded.
In an exemplary embodiment of the present disclosure, the filtering assembly further includes:
the second capacitor bank is provided with at least two second capacitors which are connected in series, the first end of the second resistor is connected with the first end of the first resistor, the second end of the second resistor is connected with the first end of the second capacitor bank, the second end of the second capacitor bank is connected with the second end of the first capacitor bank, and the second end of the first resistor is connected with the second end of the second resistor.
In an exemplary embodiment of the present disclosure, the power supply branch further includes: a first isolation switch having a third terminal and a fourth terminal, the third terminal connected to the first output terminal, the fourth terminal connected to the first terminal and to a first end of the first resistor;
the return branch includes: a second isolation switch having a fifth terminal and a sixth terminal, the fifth terminal connected to the second output terminal, the sixth terminal connected to the second terminal of the first capacitor bank.
In an exemplary embodiment of the disclosure, the first isolation switch and the second isolation switch are the same isolation switch, the isolation switch has a first connection end, a second connection end, a third connection end and a fourth connection end, the first connection end is connected to the first output end, the second connection end is connected to the first connection end and is connected to the first end of the first resistor, the third connection end is connected to the second output end, and the fourth connection end is connected to the second end of the first capacitor bank.
In an exemplary embodiment of the present disclosure, the train power supply assembly further comprises a voltage transformer, the voltage transformer being located at the primary winding; the power supply circuit further includes:
a first end of the current transformer is connected with a second end of the first capacitor bank and the sixth terminal, and a second end of the current transformer is grounded;
the kilowatt-hour meter, the kilowatt-hour meter has first input, second input and third input, first input with current transformer's first end is connected, the second input with current transformer's second end is connected, the third input with voltage transformer connects.
In an exemplary embodiment of the present disclosure, the power supply branch further includes: the first fuse is positioned between the first output end and the first isolating switch, one end of the first fuse is connected with the first output end, and the other end of the first fuse is connected with the third wiring end;
the return branch further comprises: the second fuse, the second fuse is located the second output with between the second isolator, just the one end of second fuse with the second output is connected, the other end of second fuse with the fifth wiring end is connected.
In an exemplary embodiment of the present disclosure, the power supply branch further includes:
the current sensor is provided with a current input end, a current output end and a current signal output end, the current input end is connected with the fourth wiring end, and the current output end is connected with the first wiring end and the first end of the first resistor;
a voltage sensor having a first voltage input, a second voltage input, and a voltage signal output, the first voltage input connected with the fourth terminal, the second voltage input connected with the sixth terminal.
In an exemplary embodiment of the present disclosure, the train power supply assembly further includes:
a control module, control module has current signal input, voltage signal input, first state signal input, second state signal input, third state signal input and first control signal output, current signal input with current signal output connects, voltage signal input with voltage signal output connects, first state signal input with first fuse with the second fuse is connected, second state signal input with first isolator with second isolator connects, third state input with switch signal output connects, first control signal output with first control end connects.
In an exemplary embodiment of the present disclosure, the train power supply assembly further includes:
and the input end of the power supply control relay is connected with the first control signal output end, and the output end of the power supply control relay is connected with the first control end.
In an exemplary embodiment of the present disclosure, the train has a main break control loop, the main break control loop at least includes a first control switch, the first control switch is used for controlling the on-off of the primary winding of the transformer, and the control module further includes: a second control signal output, the train power supply assembly further comprises:
and the input end of the main off control relay is connected with the second control signal output end, and the control output end of the main off control relay is at least connected with the first control switch so as to be used for controlling the opening and closing of the first control switch.
The technical scheme provided by the disclosure can achieve the following beneficial effects:
in the power supply circuit of train power supply subassembly that this disclosure provided, the power supply branch road can include first switch and end connector, can export alternating current to the train through this single line of power supply branch road when first switch opens to flow back through ground and rail through the backward flow branch road, thereby the purpose of single line power supply can be realized to this application.
Simultaneously, this application need not set up the rectifier cabinet for prior art to the train power supply subassembly of this disclosure can adapt to the specific demand that needs alternating current power supply. And, this disclosure is provided with the filtering subassembly to this disclosure can absorb and filter overvoltage and electric current, and then prevents that electric current or voltage are too big and cause the problem that the circuit of train takes place to damage.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 shows a circuit schematic of a train power supply assembly according to an exemplary embodiment of the present disclosure;
fig. 2 shows a circuit schematic of a train power supply assembly according to another exemplary embodiment of the present disclosure.
Description of reference numerals:
1. a transformer; 2. a power supply branch; 3. a reflux branch; 4. a filtering component; 5. a voltage transformer; 6. a control module; 7. a power supply control relay; 8. a master-slave control loop; 9. a main off control relay; 11. a primary winding; 12. a secondary winding; 21. a first switch; 22. a vehicle end connector; 23. an isolating switch; 24. a first fuse; 25. a current sensor; 26. a voltage sensor; 31. a current transformer; 31. an electric meter; 33. a second fuse; 41. a first resistor; 42. a first capacitor bank; 43. a second resistor; 44. a second capacitor bank; 71. a first diode; 72. a first zener diode; 81. a first control switch; 91. a second diode; 92. a second zener diode; 121. a first output terminal; 122. a second output terminal; 421. a first capacitor; 441. a second capacitance.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
Currently, the railway system of each country in the world is different, so that the train power supply mode of each country is different. For example: the power supply mode of railways in some countries is single line power supply and steel rail backflow; the power supply of railways in some countries is two-wire power and return. Alternatively, trains in some countries need to be supplied with dc power and trains in some countries need to be supplied with ac power. At present, in the field, each train power supply assembly can only be suitable for one railway system and one train power supply mode, and cannot be used in a mixed mode. Therefore, in order to meet the requirements of different railway systems and power supply modes, different train power supply assemblies have to be developed. The inventor of the present disclosure, through careful consideration, expends huge creative cost, develops a power supply mode of adopting single line power supply and rail backflow and supplying alternating current to a train, and develops a train power supply assembly suitable for the power supply mode.
The present disclosure provides a train power supply assembly that not only can realize single line power supply, rail backward flow, can also supply alternating current to the train. Meanwhile, the train power supply unit can absorb and filter overvoltage and current, so that the circuit of the train is prevented from being damaged by the overlarge current and voltage.
As shown in fig. 1, the train power supply assembly may include a transformer 1 and a power supply circuit. The transformer 1 may have a primary winding 11 and a secondary winding 12, and the primary winding 11 may be connected to a railway catenary, which may provide an initial voltage for the train. In one embodiment of the present disclosure, the railway contact system may be a high-voltage cable overhead with respect to a rail, but is not limited thereto, and the form of the railway contact system is not limited to the above-mentioned overhead high-voltage cable, and may also be other forms, such as: it is also within the scope of the present disclosure that the power supply tracks are arranged parallel to the rails, and may be selected according to the actual needs.
The secondary winding 12 may have a first output terminal and a second output terminal. When the voltage provided by the railway contact network is greater than the voltage required by the train, the number of turns of the primary winding 11 of the transformer 1 can be greater than that of the secondary winding 12, so that the purpose of reducing the voltage is achieved; when the voltage provided by the railway contact system is less than the voltage required by the train, the number of turns of the primary winding 11 of the transformer 1 can be less than that of the secondary winding 12, so that the purpose of increasing the voltage is achieved. The first output terminal and the second output terminal may be respectively located at both ends of the secondary winding 12, but are not limited thereto.
In one embodiment of the present disclosure, the nominal capacity of the secondary winding 12 of the transformer 1 may be 864KVA, the nominal voltage may be AC3100V, the nominal current may be 279A, the leakage inductance may be 1.5mH, and the short-circuit resistance is 6%, and the secondary winding 12 of the transformer 1 may withstand 2 seconds of short-circuit current. The secondary winding 12 of the transformer 1 can thus provide 3000V of alternating current to the power supply circuit. Without being limited thereto, the nominal capacity, nominal voltage, nominal current, leakage inductance and short-circuit impedance of the secondary winding 12 of the transformer 1 may not be the above values, but may be other values, such as: when the power supply circuit needs 4000V AC, the nominal voltage of the transformer 1 may also be AC4000V, so that the above values can be set according to actual needs, which is within the protection scope of the present disclosure.
The supply circuit may include a supply branch 2, a return branch 3 and a filter assembly 4. The power supply branch 2 is used for supplying power to the train, and it can be understood that the power supply branch 2 is used for supplying power to each electrical appliance of the train. The supply branch 2 may comprise a first switch 21 and a vehicle end connector 22. The first switch 21 may have a first terminal, a second terminal, a switch signal output terminal, and a first control terminal, wherein the first terminal may be connected to the first output terminal, and the second terminal may be connected to the vehicle-side connector 22. When the first switch 21 is turned off, the power supply branch 2 is turned off, and the power supply branch 2 does not supply power to the train at this time; when the first switch 21 is closed, the power supply branch 2 is turned on, and the power supply branch 2 can supply power to the train.
In one embodiment of the present disclosure, the first switch 21 may be a contactor, which may have two sets of contacts, each set having one normally open contact and one normally closed contact. Wherein one group of the contacts is a main contact, and the other group of the contacts is a spare contact. When the main contact has a problem, the spare contact can be used, so that the damage of the contactor caused by the damage of a group of contacts can be prevented, and the abnormity of the power supply branch circuit 2 is further caused.
Further, the rated operating voltage of the first switch 21 may be AC3600V, the maximum operating voltage may be AC4000V, the AC maximum breaking current capacity may be (3600V)400A, the short-time withstand current may be 8KA, and the control voltage may be 110V. Without limitation, the rated operating voltage, the maximum ac breaking current capability, the short-time withstand current, and the control voltage of the first switch 21 may not be the above values, and may be set according to actual needs, which are all within the protection scope of the present disclosure.
The end connectors 22 may be connected to a train for outputting current to the train. The vehicle end connector 22 may have an input and an output. Wherein, the input end of the vehicle end connector 22 can be connected with the second terminal of the first switch 21; the output of the end connector 22 may be connected to a train, and it will be understood that the train may be provided with a power supply interface, which may be connected to each electrical appliance of the train, and the output of the end connector 22 may be connected to the power supply interface to output current to each electrical appliance of the train.
One end of the above-mentioned return branch 3 may be connected to the second output terminal, and the other end of the return branch 3 may be grounded. Here, the grounding is understood to mean that the return branch 3 may return to the ground or to return to the rail. Thus, the return branch 3 can return the rail.
The filter assembly 4 may have a first resistor 41 and a first capacitor bank 42. First capacitor bank 42 may have at least two first capacitors 421 connected in series, a first terminal of first resistor 41 may be connected to the first terminal, a second terminal of first resistor 41 may be connected to the first terminal of first capacitor bank 42, and a second terminal of first capacitor bank 42 may be grounded. This is disclosed through setting up filtering subassembly 4, can absorb and carry out the filtering with too big voltage and electric current to prevent that too big voltage and electric current from causing the influence to the circuit of train, and can guarantee that the electric current wave form of output is unanimous.
Further, in order to ensure the operational stability of the filter assembly 4, the filter assembly 4 may further be provided with a second resistor 43 and a second capacitor bank 44. The second capacitor bank 44 may have at least two second capacitors 441 connected in series, a first end of the second resistor 43 may be connected to a first end of the first resistor 41, a second end of the second resistor 43 may be connected to a first end of the second capacitor bank 44, a second end of the second capacitor bank 44 may be connected to a second end of the first capacitor bank 42, and a second end of the first resistor 41 may be connected to a second end of the second resistor 43. Therefore, when one of the resistors in the filter assembly 4 works abnormally, the other resistor can be applied to work, and the working stability of the filter assembly 4 can be further ensured. But not limited thereto, in order to further improve the working stability of the filter component 4, more resistors and capacitors may be further provided, and meanwhile, the overvoltage and current absorption and the filtering effect of the filter component 4 may be better by providing more resistors and capacitors, and the selection may be performed according to actual needs.
In one embodiment of the present disclosure, the resistance values of the first resistor 41 and the second resistor 43 may be 39 Ω, and the power may be 40W; the capacitance value of each of the first capacitor 421 and the second capacitor 441 may be 0.25uF, and the withstand voltage value may be 4000V. Without limitation, the resistance and power of the first resistor 41 and the second resistor 43 and the capacitance of each of the first capacitor 421 and the second capacitor 441 may be set to other values, which may be selected and changed according to actual needs, and this is within the scope of the present disclosure.
In one embodiment of the present disclosure, the power supply branch 2 may further include a first isolation switch, which may have a third terminal and a fourth terminal. Wherein the third terminal may be connected to the first output terminal and the fourth terminal may be connected to the first terminal. When the power supply branch 2 is provided with the first resistor 41, the fourth terminal is connected to the first terminal and also connected to the first terminal of the first resistor 41.
Further, the first isolation switch may be a manual switch, but is not limited thereto, and the first isolation switch may also be an automatic switch. When setting up first isolator in power supply branch 2 after, can break off power supply branch 2 through first isolator, also can consequently be convenient for the maintainer overhaul power supply branch 2 to prevent to cause the maintainer to appear the risk of electrocuting because power supply branch 2 is electrified.
In one embodiment of the present disclosure, the return leg 3 may further include a second isolation switch, which may have a fifth terminal and a sixth terminal. Wherein the fifth terminal may be connected to the second output terminal and the sixth terminal may be connected to the second terminal of first capacitor bank 42. The second isolation switch may also be a manual switch, but is not limited thereto, and the second isolation switch may also be an automatic switch. After backflow branch 3 sets up second isolator, can break off backflow branch 3 through second isolator, also can be convenient for the maintainer to overhaul backflow branch 3 consequently to prevent to cause the maintainer to appear the risk of electrocuting because backflow branch 3 is electrified.
In one embodiment of the present disclosure, the first and second isolation switches may be the same isolation switch 23, and the isolation switch 23 may have a first connection terminal, a second connection terminal, a third connection terminal, and a fourth connection terminal. The first connection terminal may be connected to the first output terminal, the second connection terminal may be connected to the first connection terminal, the second connection terminal may be connected to the first terminal of the first resistor 41, the third connection terminal may be connected to the second output terminal, and the fourth connection terminal may be connected to the second terminal of the first capacitor bank 42. Therefore, the power supply assembly of the train can be switched off and on only by controlling the on and off of one isolating switch 23.
The disconnector 23 is, for example, a main contact and an auxiliary contact. The number of poles of the main contacts of the isolating switch 23 may be two, the number of the main contacts may be two pairs, the rated voltage of the main contacts may be AC3100V, and the rated current of the main contacts may be 300A; the auxiliary contacts of the isolating switch 23 may be two groups, one group is a normally open contact, the other group is a normally closed contact, the rated voltage of the auxiliary contact may be DC110V, and the rated current of the auxiliary contact may be 1A. The above is merely an illustration of the isolation switch 23 by a specific example, but is not limited thereto, and the structure of the isolation switch 23 may be changed according to actual needs, which is within the protection scope of the present disclosure.
Further, when the disconnecting switch 23 is a manual switch, the disconnecting switch 23 may have a handle, and the main contact and the auxiliary contact of the disconnecting switch 23 may be controlled to be turned on or off by the handle. The handle may have a first position and a second position, wherein the first position may be a supply potential and the second position may be a ground potential. When the handle is at a power supply potential, the main contact is closed, and the train power supply assembly can work; when the handle is in the connection position, the main contact is disconnected, the train power supply assembly is disconnected to work, and the maintainer can safely overhaul the train power supply assembly.
In one embodiment of the present disclosure, the train power supply assembly may further include a voltage transformer 5, and the voltage transformer 5 may be located at the primary winding 11 to detect the voltage of the primary winding 11. The power supply circuit of the present disclosure may further include: a current transformer 31 and a watt-hour meter 32. Wherein the first terminal of the current transformer 31 may be connected to the second terminal of the first capacitor bank 42, and the first terminal of the current transformer 31 may be connected to the sixth terminal, and the second terminal of the circuit transformer may be grounded. The current transformer 31 can detect the current level in the power supply circuit.
The above-mentioned electrical meter 32 may have a first input, a second input and a third input. The first input terminal may be connected to a first terminal of the current transformer 31, the second input terminal may be connected to a second terminal of the current transformer 31, and the third input terminal may be connected to the voltage transformer 5. Through the electric meter 32, the electric energy consumed by the whole train can be accurately calculated through the voltage detected by the voltage transformer 5 and the current detected by the current transformer 31.
Further, the electric meter 32 may be provided with a data transmission port through which the electric energy data consumed by the train can be transmitted or downloaded from the electric meter 32 through a dedicated device.
Without limitation, the positions of the voltage transformer 5 and the current transformer 31 may be changed as required, for example: the voltage transformer 5 may also be located at the secondary winding 12, the first end of the current transformer 31 may also be connected to the first end of the first resistor 41, and the second end of the current transformer 31 may also be connected to the first terminal of the contactor, which are all within the protection scope of the present disclosure, and may be selected according to the arrangement position of the train power supply assembly actually required.
In one embodiment of the present disclosure, the power supply branch 2 may further include a first fuse 24, the first fuse 24 may be located between the first output terminal and the first isolation switch, and one end of the first fuse 24 may be connected with the first output terminal and the other end of the first fuse 24 may be connected with the third terminal. For example, the rated current of the first fuse 24 may be 279A, the rated voltage may be 3100V, and the short-circuit current may be 7905A. The short-circuit current of the first fuse 24 may be calculated by:wherein IFirst fuseK in the first fuse 24 in the present embodiment is the rated current of the first fuse 24First fuseThe values may be calculated as:it should be noted that the first fuse 24 is selected according to the principle IPower supply branch<IFirst fuse<iFirst fuseWherein, IPower supply branchFor the magnitude of the current, I, during operation of the supply branch 2First fuseIs the rated current, i, of the first fuse 24First fuseIs the short circuit current of the first fuse 24. The first fuse 24 can be selected as a function of the current of the operating supply branch 2, which current rating of the first fuse 24 is greater than or equal to 1.5 times.
Further, the return branch 3 may further include a second fuse 33, the second fuse 33 may be located between the second output terminal and the second isolation switch, one end of the second fuse 33 may be connected to the second output terminal, and the other end of the second fuse 33 may be connected to the fifth terminal. For example, the rated current of the second fuse 33 may be 279A, the rated voltage may be 3100V, and the short-circuit current may be 7905A. The short-circuit current of the second fuse 33 may be calculated by:wherein ISecond fuseFor the rated current of the second fuse 33, the K value in the second fuse 33 in this embodiment may be calculated by:it should be noted that the second fuse 33 is selected according to the principle that IPower supply branch<ISecond fuse<iSecond fuseWherein, IPower supply branchThe magnitude of the current when the return branch 3 is in operation,Isecond fuseIs the rated current, i, of the second fuse 33Second fuseIs a short-circuit current of the second fuse 33. The second fuse 33 can be selected as a function of the current of the return branch 3, which is usually greater than or equal to 1.5 times the rated current of the second fuse 33.
By providing the first fuse 24 in the power supply branch 2 and the second fuse 33 in the return branch 3, it is possible to prevent the train electrical equipment from being damaged due to an excessive current.
In one embodiment of the present disclosure, the power supply branch 2 may further include a current sensor 25 and a voltage sensor 26. The current sensor 25 may have, among other things, a current input, a current output, and a current signal output. The current input terminal may be connected to the fourth terminal, the current output terminal may be connected to the first terminal, and the current output terminal may be connected to the first terminal of the first resistor 41. By providing the current sensor 25, the current condition of the power supply branch 2 can be measured.
For example, the rated measurement current of the current sensor 25 may be 500a (rms), the rated measurement output current may be 125ma (rms), and the power supply voltage of the current sensor 25 may be + ± (15-24) V, but is not limited thereto, and the current sensor 25 with different parameters may be selected according to actual needs, and this is within the protection scope of the present disclosure.
The voltage sensor 26 may have a first voltage input, a second voltage input, and a voltage signal output. Wherein the first voltage input terminal may be connected to the fourth terminal and the second voltage input terminal may be connected to the sixth terminal. By providing the voltage sensor 26, the voltage condition of the power supply circuit can be measured.
For example, the rated measurement voltage of the current sensor 25 may be 4200V (rms), the rated measurement output current may be 70ma (rms), and the power supply voltage of the current sensor 25 may be ± 24V, but is not limited thereto, and the voltage sensor 26 with different parameters may be selected according to actual needs, and this is within the protection scope of the present disclosure.
In one embodiment of the present disclosure, the train power supply assembly may also include a control module 6, as shown in fig. 2. The control module 6 may have a current signal input, a voltage signal input, a first status signal input, a second status signal input, and a first control signal output. For example, the control module 6 may be a train network control unit, but is not limited thereto, and may also be other control modules 6, which are within the protection scope of the present disclosure.
Wherein the current signal input may be connected to the current signal output for receiving the current signal emitted by the current sensor 25. The voltage signal input may be connected to the voltage signal output for receiving a voltage signal emitted by the voltage sensor 26.
The first state signal input terminal may be connected to the first fuse 24 and the second fuse 33 for receiving state signals of the first fuse 24 and the second fuse 33. Further, the first fuse 24 may have a first state signal output terminal, and the second fuse 33 may have a second state signal output terminal. The first state signal input may be connected to the first state signal output and the second state signal output for receiving state signals of the first fuse 24 and the second fuse 33.
Further, a second status signal input may be connected to the first and second isolation switches for receiving status signals of the first and second isolation switches being open and closed. When the first isolating switch and the second isolating switch are the same isolating switch 23, the second state signal input end may be connected with the auxiliary contact of the isolating switch 23, so as to receive the on-off state signal of the isolating switch 23. Meanwhile, the auxiliary contacts are normally open and normally closed, so that the state signal can be prevented from being misreported in the mode.
The third state input may be connected to the switch signal output for receiving the on-off state of the first switch 21. The switch signal output terminal can be a standby contact of the contactor, and when the state is fed back, the standby contact of the first switch 21 is kept normally open and normally closed to prevent the false alarm of the state signal. Also, the first control signal output terminal may be connected to the first control terminal. When the control module 6 judges that the first switch 21 needs to be opened, an opening signal can be sent to the first control end through the first control signal output end, so that the first switch 21 is opened to cut off the circuit; when the control module 6 determines that the first switch 21 needs to be closed, a closing signal may be sent to the first control terminal through the first control signal output terminal, so that the first switch 21 is closed to turn on the circuit.
In one embodiment of the present disclosure, the train power supply assembly of the present disclosure may have three operating conditions, which are: normal operating mode, fault operating mode and maintenance operating mode.
When the control module 6 detects that the states of the first fuse 24 and the second fuse 33 are normal and the state of the isolating switch 23 is at the power supply potential, it can be determined that the train power supply assembly is in a normal working condition. The train driver can send a first switch 21 closing instruction to the control module 6, and at this time, the first control signal output end sends a closing signal to the first control end, so that the first switch 21 is closed to conduct the power supply circuit. Further, the train driver can send an opening instruction of the first switch 21 to the control module 6, and at this time, the first control signal output end sends an opening signal to the first control end, so that the first switch 21 is opened to cut off the power supply circuit.
When the control module 6 detects that the first fuse 24 and/or the second fuse 33 are opened, or the detection values of the current sensor 25 and/or the voltage sensor 26 are abnormal, it may be considered that the train power supply assembly is in a fault condition, and the control module 6 may control the first switch 21 to be opened.
When the control module 6 detects that the isolating switch 23 is in an on-position, the maintenance working condition can be adopted, and the first switch 21 is not allowed to be closed at the moment so as to ensure the safety of maintenance personnel.
Further, the train power supply assembly may further include a power supply control relay 7. The power supply control relay 7 may have an input, an output and a control output. The input of the power supply control relay 7 may be connected to the first control signal output, and the control output of the power supply control relay 7 may be connected to the first control terminal. When the control module 6 sends an opening or closing signal to the first switch 21, the power supply control relay 7 may be controlled to be opened or opened first, so that the first switch 21 may be controlled to be opened or closed through the power supply control relay 7. Since the power supply control relay 7 is weak and the first switch 21 is strong, the purpose of controlling strong electricity can be achieved by controlling weak electricity, so that the opening or closing of the first switch 21 can be controlled more easily.
Further, the train power supply assembly may also have a first diode 71 and a first zener diode 72. Wherein an input terminal of the first diode 71 may be connected with a first control signal output terminal, and an output terminal of the first diode 71 may be connected with an input terminal of the power supply control relay 7 for filtering a signal emitted by the control module 6. One end of the first zener diode 72 may be connected to an input terminal of the power supply control relay 7, and the other end of the first zener diode 72 may be connected to an output terminal of the power supply control relay 7, so as to stabilize the voltage of the power supply control relay 7 and ensure the normal operation of the power supply control relay 7.
In one embodiment of the present disclosure, the train may have a master break control loop 8. The main break control loop 8 may comprise at least a first control switch 81, and the first control switch 81 may be used to control the make and break of the primary winding of the transformer 1. When the first control switch 81 is closed, the initial winding can be conducted at this time, and the power supply circuit can work; when the first control switch 81 is turned off, the initial winding is turned off, and the power supply circuit cannot operate.
Further, the control module 6 can also snap the second control signal output end. The train power supply assembly may also include a main off control relay 9. The main break control relay 9 may have an input, an output and a control output. The output of the main break control relay 9 may be connected with at least a first control switch 81 for controlling the opening and closing of the first control switch 81. Since the main off control relay 9 is weak current and the first control switch 81 is strong current, the purpose of controlling strong current can be achieved by controlling weak current, so that the opening or closing of the first control switch 81 can be controlled more easily.
When the control module 6 detects that the main open control loop 8 is open, i.e. the first control switch 81 is open, the first switch 21 may be controlled to be open. And when the train is in a fault working condition, the control module 6 can control the main break control loop 8 to be disconnected, and the first switch 21 is disconnected after one second delay, so that the power supply assembly of the train and the electric appliances on the train are not damaged.
Further, the train power supply assembly may also have a second diode 91 and a second zener diode 92. Wherein, the input end of the second diode 91 can be connected with the second control signal output end, and the control output end of the second diode 91 can be connected with the input end of the main-off control relay 9, so as to be used for filtering the signal sent by the control module 6. One end of the second zener diode 92 may be connected to the input end of the main off control relay 9, and the other end of the second zener diode 92 may be connected to the output end of the main off control relay 9, so as to stabilize the voltage of the main off control relay 9 and ensure the normal operation of the main off control relay 9.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.