Alternating current-direct current double-current system rail vehicle test line contact network
By designing the AC-DC dual-current rail vehicle test line contact network, and using phase-divided insulators and contact switches, safe switching between AC and DC power supply is achieved, solving the problem of safe switching of electric power supply in rail transit systems.
Patent Information
- Application Number
- CN202421640210.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-11
AI Technical Summary
In the rail transit system, how to simulate and ensure the safe switching of AC and DC power supply, especially during the test drive.
A contact network for test-driven vehicles with AC and DC dual-current rail vehicles is designed. The contact network bus is divided into AC and DC switching sections, neutral sections, electrically-free sections and AC sections through phase separation insulators and phase separation isolators, and a contact switch is set to realize power supply of full AC, full DC and AC and DC conversion types.
It realizes safe switching of AC and DC power supply in the test line, ensuring the safety and stability of the power supply of the rail transit system.
Smart Images
Figure CN222756449U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of dual-current power supply rail transportation, in particular to an AC / DC dual-current rail vehicle test line contact network. Background Art
[0002] Urban rail transit in the urban transportation network generally has a short line length, concentrated passenger flow, and dense station layout. It generally adopts 750V or 1500V DC traction power supply system, which generally has high investment, high maintenance cost, and low operating speed (generally 80-100km / h). With the rapid development of urbanization, more and more cities have passengers living in the suburbs and working in the city, and this part of the population is growing. Under this circumstance, this part of the population has put forward new demands for transportation: fast and direct, so suburban railway lines came into being. Suburban railway lines are generally long, with large station spacing and few controlled factors. They mainly use 27.5kV / 50Hz AC traction power supply system, which generally has low investment, low maintenance cost, high operating speed (generally 120-160km / h), and can achieve fast arrival. Therefore, there are dual-current lines with DC power supply in the urban area and AC power supply in the suburbs.
[0003] Before the official operation of rail transit, it is necessary to conduct power-on debugging. Since the formal contact network structure is considered to be complete and is affected by many factors, it is necessary to build a separate contact network for debugging. During the construction process, it is necessary to consider the debugging function for targeted construction. The object that needs to be debugged in this application is the contact network with AC / DC hybrid power supply. It is necessary to consider the DC power supply part, the AC power supply part in the dual-current line, and the transition zone between the two power supply systems. Therefore, the key problem to be solved in this application is: how to simulate and ensure the safe switching of AC and DC power supplies. Utility Model Content
[0004] The utility model aims to provide an AC / DC dual-current rail vehicle test line contact network to ensure safe switching of AC and DC power supplies in the test contact network.
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an AC / DC dual-current rail vehicle test line overhead contact network, including an overhead contact network busbar, on which four phase-splitting insulators are installed, and the four phase-splitting isolators divide the overhead contact network busbar into an AC / DC switching section, a first neutral section, a non-powered section, a second neutral section and an AC section in sequence, the AC / DC switching section is connected to a DC power supply and an AC power supply, the DC power supply and the overhead contact network busbar are connected to a DC access switch, the AC power supply and the overhead contact network busbar are connected to an AC access switch, the phase-splitting isolator between the AC / DC switching section and the first neutral section is connected in parallel with a first contact switch, and the phase-splitting isolator between the second neutral section and the AC section is connected in parallel with a second contact switch.
[0006] The principles and advantages of this solution are:
[0007] The state process of the contact network in the AC / DC switching section of the test line:
[0008] In AC state: the AC grid-connected switch is in the closed position, the DC grid-connected switch is in the open position, and the first contact switch and the second contact switch are in the closed position.
[0009] In DC state: the AC grid-connected switch is in the open position, the DC grid-connected switch is in the closed position, and the first contact switch and the second contact switch are in the open position.
[0010] When the AC state is switched to DC: the first step is to turn on the AC access switch; the second step is to turn on the first contact switch and the second contact switch; the third step is to fully discharge the AC / DC switching section contact network; the fourth step is to close the DC access switch after the discharge is completed.
[0011] When the DC state is switched to AC: the first step is to open the DC grid-connected switch; the second step is to fully discharge the contact network of the AC / DC switching section; the third step is to close the first contact switch and the second contact switch; the fourth step is to close the AC grid-connected switch.
[0012] The contact network of the test line has three types: full AC, full DC, and half AC and half DC, with a conversion section in the middle. By setting up a contact switch, full AC power supply type, full DC type and AC / DC conversion type can be realized. The AC / DC conversion area uses 4 phase-splitting insulators to isolate and form an isolated conversion area.
[0013] Furthermore, the overhead contact network busbar of the non-powered section includes a grounding branch, and a grounding switch is connected to the grounding branch. The non-powered section is kept in a non-current state through the grounding branch.
[0014] Furthermore, the length of the contact network busbar of the first neutral section and the second neutral section is greater than 25 meters, and the preferred length is 29 meters; the length of the contact network busbar of the non-powered section is 15 to 30 meters, and the preferred length is 20 meters.
[0015] Through actual experiments, considering the factors of running speed and circuit switching time, the length of the first neutral section and the second neutral section should be greater than 25 meters, preferably 29 meters, and the length of the contact network bus in the power zone is 15~30 meters; the preferred length is 20 meters, which ensures the smooth switching of AC and DC.
[0016] Furthermore, the contact network busbar is fixedly installed on the contact network support frame in a manner that a load-bearing cable, a contact wire, two reinforcing wires and an overhead ground wire are arranged in parallel and insulated from each other.
[0017] The test run overhead contact busbar simulates the actual operation overhead contact busbar, which can reduce the interference of other factors that migrate to the actual operation overhead contact busbar after the test run.
[0018] Furthermore, the DC network switch, AC network switch, first contact switch, second contact switch and grounding switch are all electric switches, which can be remotely controlled to improve the safety of the operation.
[0019] Furthermore, the overhead contact network busbar of the AC section is connected to a test branch cable entering the test overhead contact network; the overhead contact network busbar of the non-isolated conversion zone is powered by the test branch cable.
[0020] Finally, the contact network busbar of the AC section is connected with a branch cable entering the sub-district office. Connecting this section of AC cable to the sub-district office facilitates unified management and monitoring. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the structure of the contact network of the AC / DC dual-current rail vehicle test line. DETAILED DESCRIPTION
[0022] The reference numerals in the drawings of the specification include: phase isolator 1, overhead contact bus 2, test branch cable 3, DC access switch G1, AC access switch G2, first contact switch G3, grounding switch G4, second contact switch G5, substation electric switch G6.
[0023] The following is further described in detail through specific implementation methods:
[0024] The embodiment is basically as shown in the attached Figure 1 As shown: the contact network of the AC / DC dual-current rail vehicle test line includes a contact network busbar 2, on which four phase isolators 1 are installed. The four phase isolators 1 divide the contact network busbar 2 into an AC / DC switching section, a first neutral section, a non-powered section, a second neutral section and an AC section in sequence. The AC / DC switching section is connected to a DC power supply and an AC power supply. The DC power supply and the contact network busbar are connected to a DC access switch G1, and the AC power supply and the contact network busbar are connected to an AC access switch G2. The phase isolator 1 between the AC / DC switching section and the first neutral section is connected in parallel with a first contact switch G3, and the phase isolator between the second neutral section and the AC section is connected in parallel with a second contact switch G5. The contact network busbar of the non-powered section includes a grounding branch, and the grounding branch is connected to a grounding switch G4.
[0025] In AC state: the AC grid-connected switch G2 is in the closed position, the DC grid-connected switch G1 is in the open position, the first contact switch G3 and the second contact switch G5 are in the closed position, and the grounding switch G4 is in the open position.
[0026] In DC state: the AC grid-connected switch G2 is in the open position, the DC grid-connected switch G1 is in the closed position, the first contact switch G3 and the second contact switch G5 are in the open position, and the grounding switch G4 is in the closed position.
[0027] When the AC state is switched to DC: the first step is to open the AC grid-connected switch G2; the second step is to open the first contact switch G3 and the second contact switch G5; the third step is to fully discharge the AC / DC switching section contact network; the fourth step is to close the DC grid-connected switch G1 after the discharge is completed, and the grounding switch G4 is in the closed position.
[0028] When the DC state is switched to AC: the first step is to open the DC grid switch G1; the second step is to fully discharge the AC / DC switching section contact network; the third step is to close the first contact switch G3 and the second contact switch G5; the fourth step is to close the AC grid switch G2, and the grounding switch G4 is in the closed position.
[0029] The contact network of the test line has three types: full AC, full DC, and half AC and half DC, with a conversion section in the middle. By setting up a contact switch, full AC power supply type, full DC type and AC / DC conversion type can be realized. The AC / DC conversion area uses 4 phase-splitting insulators to isolate and form an isolated conversion area.
[0030] The length of the contact busbar 2 of the first neutral section and the second neutral section is greater than 25 meters, and the preferred length is 29 meters; the length of the contact busbar of the non-powered section is 15 to 30 meters, and the preferred length is 20 meters.
[0031] The contact network busbar 2 is fixedly installed on the contact network support frame in a manner that a load-bearing cable, a contact wire, two reinforcing wires and an overhead ground wire are arranged in parallel and insulated from each other.
[0032] The DC Internet switch G1, the AC Internet switch G2, the first contact switch G3, the second contact switch G5 and the grounding switch G4 are all electric switches, which can be remotely controlled to improve the safety of the operation.
[0033] The contact network busbar of the AC section is connected to a test branch cable 3 entering the test contact network; the test branch cable 3 is used to supply power to the contact network busbar in the non-isolated conversion area.
[0034] The AC section of the overhead line busbar is connected to the branch cable entering the sub-station, and the branch cable is disconnected by the sub-station electric switch G6. Connecting this section of AC cable to the sub-station facilitates unified management and monitoring.
[0035] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. AC / DC dual-current rail vehicle test line contact network, characterized by: It includes an overhead contact busbar, on which four phase-splitting insulators are installed. The four phase-splitting isolators divide the overhead contact busbar into an AC / DC switching section, a first neutral section, a non-powered section, a second neutral section and an AC section in sequence. The AC / DC switching section is connected to a DC power supply and an AC power supply. The DC power supply and the overhead contact busbar are connected to a DC access switch. The AC power supply and the overhead contact busbar are connected to an AC access switch. The phase-splitting isolator between the AC / DC switching section and the first neutral section is connected in parallel with a first contact switch. The phase-splitting isolator between the second neutral section and the AC section is connected in parallel with a second contact switch.
2. The AC / DC dual-current rail vehicle test line contact network according to claim 1, characterized in that: The overhead contact network busbar of the non-electric section includes a grounding branch, and a grounding switch is connected to the grounding branch.
3. The AC / DC dual-current rail vehicle test line contact network according to claim 1, characterized in that: The length of the contact network busbars of the first neutral section and the second neutral section is greater than 25 meters.
4. The AC / DC dual-current rail vehicle test line contact network according to claim 3, characterized in that: The length of the contact network busbar of the first neutral section and the second neutral section is 29 meters.
5. The AC / DC dual-current rail vehicle test line contact network according to claim 1, characterized in that: The length of the contact network busbar of the non-electric section is 15 to 30 meters.
6. The AC / DC dual-current rail vehicle test line contact network according to claim 5, characterized in that: The length of the overhead contact busbar of the non-electric section is 20 meters.
7. The AC / DC dual-current rail vehicle test line contact network according to claim 6, characterized in that: The contact network busbar is fixedly installed on a contact network support frame in a manner that a load-bearing cable, a contact wire, two reinforcing wires and an overhead ground wire are arranged in parallel and insulated from each other.
8. The AC / DC dual-current rail vehicle test line contact network according to claim 7, characterized in that: The DC network switch, AC network switch, first connecting switch, second connecting switch and grounding switch are all electric switches.
9. The AC / DC dual-current rail vehicle test line contact network according to claim 8, characterized in that: The contact network busbar of the AC section is connected with a test branch cable entering the test contact network.
10. The AC / DC dual-current rail vehicle test line contact network according to claim 9, characterized in that: The contact network busbar of the AC section is connected with a sub-district branch cable entering the sub-district, and the sub-district branch cable is connected with an electric switch of the sub-district.