CN110783985B - Diesel locomotive and intermediate direct current loop isolation system and method thereof - Google Patents
Diesel locomotive and intermediate direct current loop isolation system and method thereof Download PDFInfo
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- CN110783985B CN110783985B CN201911070368.4A CN201911070368A CN110783985B CN 110783985 B CN110783985 B CN 110783985B CN 201911070368 A CN201911070368 A CN 201911070368A CN 110783985 B CN110783985 B CN 110783985B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C5/00—Locomotives or motor railcars with IC engines or gas turbines
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Abstract
The invention discloses an internal combustion locomotive and an intermediate direct current loop isolation system and method thereof. By connecting the braking resistor to the intermediate dc link via the switching circuit, the braking resistor consumes the high voltage on the intermediate dc link when the switching circuit is switched on. When the intermediate direct current loop needs to be isolated, the isolating switch can be automatically operated by a microcomputer, passively operated or manually operated by a person to perform discharging operation, the discharging speed is high, and the operation can be completed within 1 second. The control loop of the resistance braking contactor is incorporated into the normally closed contact of the travel switch of the high-voltage electric room door, so that the safety of maintainers entering the high-voltage room is ensured.
Description
Technical Field
The invention relates to the technical field of diesel locomotives, in particular to a diesel locomotive and an intermediate direct current loop isolation system and method thereof.
Background
The middle direct-current loop of the alternating-current transmission diesel locomotive is provided with the supporting capacitor, the middle direct-current loop has high voltage when the locomotive runs, and the high voltage of the middle direct-current loop cannot disappear immediately due to the existence of the supporting capacitor when the locomotive stops running and the main generator stops generating.
The prior art solution is shown in fig. 1, in which a relatively large (about 100k Ω) resistor R2 is connected in parallel to the intermediate dc link, and this resistor is connected in parallel to the intermediate dc link at all times whether the locomotive is operating or not. When the main generator stops generating electricity, the intermediate direct current circuit is discharged through the resistor.
However, in practical operation, the resistor is large in resistance and low in power, so that the resistor needs a long time to reduce the intermediate direct-current high-voltage to the safe voltage, the efficiency is low, and the potential safety hazard still exists in the period of time.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention provides an internal combustion locomotive and an intermediate direct current circuit isolation system and method thereof.
On one hand, the intermediate direct current loop isolation system of the diesel locomotive disclosed by the embodiment of the invention comprises a switch circuit, a brake resistor and a switch control circuit, wherein,
the brake resistor is connected to the intermediate direct current loop through the switch circuit, and the switch control circuit controls the switch circuit to be switched on and off.
Further, the resistance value of the brake resistor is equal to the square of the maximum voltage value of the intermediate direct current loop divided by the locomotive brake power.
Further, the switch control circuit comprises an operating platform isolating switch arranged on an operating platform of the locomotive, when the operating platform is isolated and closed, the switch circuit is conducted, and the brake resistor is electrified.
Further, the switch control circuit comprises a door lock travel switch installed on the cabinet door of the high-voltage electric room, when the cabinet door of the electric room is opened, the door lock travel switch is closed, the switch circuit is conducted, and the brake resistor is electrified.
Further, the switch control circuit comprises a locomotive microcomputer control circuit controlled by a locomotive microcomputer, when the locomotive microcomputer control circuit is closed, the switch circuit is conducted, and the brake resistor is electrified.
Further, the switching circuit is a resistance braking contactor.
On the other hand, the embodiment of the invention also discloses the diesel locomotive which comprises the intermediate direct current circuit isolation system of the diesel locomotive.
In a third aspect, the embodiment of the invention also discloses a method for isolating the intermediate direct current loop of the diesel locomotive, which comprises the steps of connecting a brake resistor on the intermediate direct current loop through a switching circuit, and consuming high voltage on the intermediate direct current loop by the brake resistor when the switching circuit is conducted.
Further, the resistance value of the brake resistor is equal to the square of the maximum voltage value of the intermediate direct current loop divided by the locomotive brake power.
Further, when the high-voltage electric room cabinet door is opened or closed, the switch circuit is controlled to be switched on or switched off through the high-voltage electric room cabinet door travel switch; and/or
The switch circuit is controlled to be switched off or switched on by manually controlling the isolating switch; and/or
The circuit is controlled by the microcomputer of the locomotive to be switched on or off.
By adopting the technical scheme, the invention at least has the following beneficial effects:
the invention utilizes the brake resistor to carry out rapid discharge of the intermediate direct current loop, when the intermediate direct current loop needs to be isolated, the discharge operation can be carried out through automatic operation of a microcomputer, passive operation or manual operation of an isolating switch, the discharge speed is high, and the discharge can be completed within 1 second. The control loop of the resistance braking contactor is incorporated into the normally closed contact of the travel switch of the high-voltage electric room door, so that the safety of maintainers entering the high-voltage room is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a prior art DC loop high voltage solution;
FIG. 2 is an intermediate DC circuit isolation system for a diesel locomotive in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a switch control circuit of an intermediate DC loop isolation system of a diesel locomotive according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an intermediate dc circuit isolation system of a diesel locomotive according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
Referring to fig. 2, 3 and 4, some embodiments of the invention disclose an intermediate dc circuit isolation system for a diesel locomotive, including a switching circuit 16, a braking resistor 17 and a switch control circuit 18, wherein the braking resistor 17 is connected to the intermediate dc circuit 13 through the switching circuit 16, and the switch control circuit 18 controls the switching circuit 16 to be turned on and off.
When the electric vehicle is used, the main generator 11, the three-phase rectifying device 12, the intermediate direct-current loop 13, the traction inverter 14 and the traction motor 15 are connected in series, the switching control circuit 18 is used for controlling the switching on and off of the switching circuit 16 and the intermediate direct-current loop 13, when discharging is required (such as the locomotive stops running and the main generator stops generating electricity), the switching control circuit 18 is used for controlling the switching circuit 16 to be switched on, at the moment, a resistance braking contactor control loop formed by the braking resistor 17 and the switching circuit 16 is switched on with the intermediate direct-current loop 13, and due to the fact that the resistance value of the braking resistor 17 is small and is about 1-4 omega, power is large, high voltage on the intermediate direct-current loop 13 can be quickly consumed on the braking resistor 17.
In the diesel locomotive and the intermediate direct current loop isolation system thereof disclosed by some embodiments of the invention, the resistance value of the brake resistor 17 is equal to the square of the maximum voltage value of the intermediate direct current loop divided by the locomotive brake power. That is, the resistance value of the brake resistor 17 is determined according to the braking power of the locomotive and the maximum voltage value of the dc circuit, so that the optimal discharging effect can be ensured.
In the diesel locomotive and the intermediate direct current circuit isolation system thereof disclosed by some embodiments of the invention, the switch control circuit 18 comprises an operating platform isolation switch 101 arranged on an operating platform of the locomotive, when the operating platform isolation switch 102 is closed, the switch circuit 16 is conducted, and the brake resistor 17 is electrified. When the driver operates the locomotive, the console disconnecting switch 102 is set to be a normally closed button switch, and when the driver presses the button switch, the console disconnecting switch is disconnected, so that the switching circuit 16 is disconnected, namely the coil 105 of the resistance braking contactor is powered off, and at the moment, the connection between the intermediate direct current loop 13 and the braking resistor 17 is disconnected through the main contact 106 of the resistance braking contactor; when the locomotive stops running, the button switch is pressed, the isolating switch of the control console recovers a normally closed state, the switch circuit is conducted, the coil of the resistance braking contactor is electrified, the middle direct current loop is conducted with the braking resistor, and the braking resistor 17 can consume high voltage on the middle direct current loop.
According to the diesel locomotive and the intermediate direct current circuit isolation system thereof disclosed by some embodiments of the invention, the switch control circuit 18 comprises a door lock travel switch 101 installed on a high-voltage electric room cabinet door, when the electric room cabinet door is opened, the door lock travel switch 101 is closed, the switch circuit 16 is conducted, and the brake resistor 17 is electrified. When the high-voltage electric room cabinet door is required to be opened for maintenance and other operations, the door lock travel switch 101 is triggered to be disconnected along with the opening of the cabinet door, the switch circuit 16 is connected, and the brake resistor 17 can consume the voltage on the intermediate direct-current loop 13, so that electric shock of workers is avoided.
In the diesel locomotive and the intermediate direct current circuit isolation system thereof disclosed by some embodiments of the invention, the switch control circuit 18 comprises a locomotive microcomputer control circuit 103 controlled by a locomotive microcomputer 104, when the locomotive microcomputer control circuit 103 is closed, the switch circuit 16 is conducted, and the brake resistor 17 is powered. When the locomotive is subjected to resistance braking, the traction motor 15 converts the kinetic energy of the locomotive into three-phase alternating current, the three-phase alternating current is converted into direct current through the traction inverter 14 and is supplied to the intermediate direct current loop 13, and at the moment, the locomotive microcomputer control circuit 103 is conducted, so that the energy fed back by the traction motor 14 is consumed on the braking resistor 17.
The embodiment of the invention also discloses an isolation method of the intermediate direct current loop of the diesel locomotive, which comprises the step of connecting a brake resistor on the intermediate direct current loop through a switching circuit, wherein when the switching circuit is switched on, the brake resistor consumes high voltage on the intermediate direct current loop. The resistance value of the brake resistor is equal to the square of the maximum voltage value of the intermediate direct current loop divided by the locomotive brake power. When the cabinet door of the high-voltage electric room is opened or closed, the switch circuit is controlled to be switched on or switched off through the travel switch of the cabinet door of the high-voltage electric room; the switch circuit is controlled to be switched off or switched on by manually controlling the isolating switch; the circuit is controlled by the microcomputer of the locomotive to be switched on or off. The three control modes can be all arranged in parallel, any one of the three control modes can control the conduction of the brake resistor, and only one control mode can be arranged.
Example 1
As shown in fig. 2, 3 and 4, the switch control circuit of the present invention mainly comprises a door lock travel switch 101, a console isolation switch 102, a locomotive microcomputer control circuit 103, a locomotive microcomputer 104 and a resistance brake contactor coil 105.
The door lock travel switch 101, the console isolating switch 102 and the locomotive microcomputer control circuit 103 are connected in parallel, any one of the two is conducted, and the resistance brake contactor coil 105 is electrified. When the coil 105 of the resistor brake contactor is energized, the main contact 106 of the lower resistor brake contactor of fig. 4 is turned on, and the high voltage of the intermediate dc circuit 13 is rapidly consumed at the brake resistor 17.
The door lock travel switch 101 is mainly installed on a cabinet door of a high-voltage electric room and is a normally closed contact, and only when the cabinet door of the high-voltage electric room is closed, the contact of the door lock travel switch 101 is disconnected. When the cabinet door of the high-voltage electric room is opened, the coil 105 of the resistance braking contactor can be powered through the closing contact of the door lock travel switch 101, and at the moment, the main contact 106 of the resistance braking contactor shown in the lower figure 4 is conducted to rapidly consume high-voltage electricity on the middle direct-current loop on the braking resistor 17, so that people are prevented from entering the high-voltage electric room by mistake under the condition that the middle direct-current loop 13 is powered, and electric shock injury is caused. In addition, when someone opens high-voltage electric room cabinet door and carries out equipment overhaul in the room, middle direct current return circuit 13 is connected to the brake resistance through resistance braking contactor main contact 106 on the same, prevents that the driver's indoor personnel from not knowing, and the operation locomotive makes middle direct current return circuit 13 electrified to cause the injury to the maintainer.
The locomotive microcomputer control circuit 103 is mainly controlled by the locomotive microcomputer 104, when the locomotive is in a self-load or resistance braking working condition, the locomotive microcomputer 104 automatically controls the locomotive microcomputer control circuit 103 to be closed, and further controls the resistance braking contactor main contact 106 of the resistance braking contactor of the fig. 4 to be closed to connect the braking resistor 17 to the intermediate direct current link. During self-loading, the three-phase alternating current generated by the main generator 11 is rectified by the three-phase rectifying device 12 and then consumed on the braking resistor through the main contact 106KB of the resistor braking contactor; when the locomotive is braked by a resistor, three-phase alternating current generated by the traction motor 15 is rectified into direct current by the traction inverter 14, and is consumed on the brake resistor 17 through the main contact 106 of the resistor brake contactor.
The console isolation switch 102 is a normally closed button switch, and is disposed on the driver console, when the driver operates the vehicle, the button switch is pressed to power off the coil 105 of the resistance brake contactor, and at this time, the intermediate direct current link 13 and the brake resistor 17 are disconnected through the main contact 106 of the resistance brake contactor. When a maintenance worker enters an electric room for maintenance, the button is reset, the contact is recovered to be in a closed state, the middle direct current link is connected to resistance braking through the main contact 106 of the resistance braking contactor, high voltage electricity on the middle direct current loop 13 is rapidly consumed on the braking resistor 17, and meanwhile, the locomotive cannot be loaded and operated.
It should be particularly noted that the various components or steps in the above embodiments can be mutually intersected, replaced, added or deleted, and therefore, the combination formed by the reasonable permutation and combination conversion shall also belong to the protection scope of the present invention, and the protection scope of the present invention shall not be limited to the embodiments.
The above is an exemplary embodiment of the present disclosure, and the order of disclosure of the above embodiment of the present disclosure is only for description and does not represent the merits of the embodiment. It should be noted that the discussion of any embodiment above is exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to those examples, and that various changes and modifications may be made without departing from the scope, as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (6)
1. An intermediate direct current loop isolation system of a diesel locomotive is characterized by comprising a switch circuit, a brake resistor and a switch control circuit, wherein,
the brake resistor is connected to the intermediate direct current loop through the switch circuit, and the switch control circuit controls the switch circuit to be switched on and off;
the switch control circuit comprises an operation panel isolating switch arranged on an operation panel of the locomotive, the operation panel isolating switch is a normally closed button switch, when the operation panel is isolated and closed, the switch circuit is conducted, and the brake resistor is electrified;
the switch control circuit comprises a door lock travel switch arranged on a high-voltage electric room cabinet door, the door lock travel switch is a normally closed contact, when the electric room cabinet door is opened, the door lock travel switch is closed, the switch circuit is conducted, and the brake resistor is electrified;
the switch control circuit comprises a locomotive microcomputer control circuit controlled by a locomotive microcomputer, when the locomotive microcomputer control circuit is closed, the switch circuit is conducted, and the brake resistor is electrified.
2. The diesel locomotive intermediate dc circuit isolation system of claim 1, wherein the resistance value of the brake resistor is equal to the square of the maximum voltage value of the intermediate dc circuit divided by locomotive braking power.
3. The diesel locomotive intermediate dc circuit isolation system of claim 1, wherein the switching circuit is a resistive brake contactor.
4. An internal combustion locomotive, characterized in that it comprises an intermediate direct current circuit isolation system of any one of claims 1 to 3.
5. The method is characterized by comprising the steps that a brake resistor is connected to an intermediate direct current loop through a switching circuit, and when the switching circuit is conducted, the brake resistor consumes high voltage on the intermediate direct current loop;
when the high-voltage electric room cabinet door is opened or closed, the switch circuit is controlled to be switched on or switched off through the normally closed travel switch of the high-voltage electric room cabinet door; and/or
The normally closed isolating switch is manually controlled to control the switching-off or the switching-on of the switching circuit; and/or
The circuit is controlled by the microcomputer of the locomotive to be switched on or off.
6. The method of isolating an intermediate dc link for a diesel locomotive according to claim 5, wherein the resistance value of said brake resistor is equal to the square of the maximum voltage value of said intermediate dc link divided by the locomotive braking power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911070368.4A CN110783985B (en) | 2019-11-05 | 2019-11-05 | Diesel locomotive and intermediate direct current loop isolation system and method thereof |
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| CN201911070368.4A CN110783985B (en) | 2019-11-05 | 2019-11-05 | Diesel locomotive and intermediate direct current loop isolation system and method thereof |
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| CN110783985A CN110783985A (en) | 2020-02-11 |
| CN110783985B true CN110783985B (en) | 2022-03-11 |
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| CN113991628B (en) * | 2021-11-24 | 2023-05-02 | 中车大连机车车辆有限公司 | Emergency discharge control method for main and auxiliary integrated diesel locomotive |
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