CN205283114U - Stray current suppression device that power supply system revealed in return circuit among subway tunnel of city - Google Patents
Stray current suppression device that power supply system revealed in return circuit among subway tunnel of city Download PDFInfo
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- CN205283114U CN205283114U CN201521060426.2U CN201521060426U CN205283114U CN 205283114 U CN205283114 U CN 205283114U CN 201521060426 U CN201521060426 U CN 201521060426U CN 205283114 U CN205283114 U CN 205283114U
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- 230000000452 restraining effect Effects 0.000 claims description 14
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Abstract
The utility model relates to a stray current suppression device that power supply system revealed in return circuit among subway tunnel of city, include: set up the first parallelly connected storage battery and the parallelly connected storage battery of second that walk between capable rail or backward flow rail and the tunnel body structure reinforcing bar in subway tunnel to and set up in the parallelly connected storage battery of subway traction substation 35kV400V transformer low voltage side 400V interchange each third of going up mutually of three -phase bus. The utility model provides a stray current suppression device that power supply system revealed in return circuit among subway tunnel of city to less fund input solves subway electric locomotive power supply major loop the stray current problem of revealing and the power consumption low voltage distribution system's that stands electromagnetism resonance problem, the stability, reliability and the security that are favorable to improving subway vehicle operation simultaneously.
Description
Technical field
This utility model relates to the stray electrical current restraining device that in a kind of urban subway tunnel, electric power system loop is revealed.
Background technology
In recent years, China is greatly developing each big and medium-sized cities the track traffic based on subway, and development speed is very rapid, and subway transportation is about to become the rapid transit mode that city is main. Meanwhile, the power supply of track traffic and actuation techniques are also fast-developing. " urban track traffic DC traction power-supply system " (GB/T10411 2005) of national standardization administration committee issue in 2005 regulation to DC power-supply system: positive pole adopts overhead contact line, negative pole backflow adopts return current rail or rail. Tractive power supply system positive pole many employings contact net of actual direct current 1500V at present, contact net and return current rail and structure rail are netted installing framework over the ground and are revealed protection, and substation ground net is connected with support, cable shield. Tunnel body structure reinforcing bars and grounded screen, return current rail, rail are all not connected to, but tunnel body structure reinforcing bars and buried pipeline are still caused serious corrosion by the stray electrical current revealed in electric power system. Meanwhile, the scattering that the electromagnetic field that underground engines produces produces on metallic object in tunnel, not only severely impact the electromagnetic environment in tunnel, but also can scatter in urban district, ground from tunnel body structure reinforcing bars. The increase put into operation along with subway line and the prolongation of mileage open to traffic, the electromagnetic environment in city proper is in the trend gone from bad to worse. Certainly, electrical network medium-high frequency electric pulse day by day seriously all adopt different transformer connections and earth point all different from direct current transportation, high ferro motor-car and subway, but the impact of electromagnetic field that the electromagnetic environment in the city proper of the subway that put into operation is produced by underground engines load largely.
If all of underground metalliferous framework and grounded screen are directly connected to, again can too much electromagnetic wave absorption. For Fuzhou City, in urban district and suburb nearby is without integrated mill; Subway build up the metal frame body maximum by forming Fuzhou City. Electromagnetic wave in urban district will be absorbed by subway metal object, simultaneously after energy accumulation also can scattering, if now by all subway metal frames directly and grounded screen connection can aggravate electromagnetic concentration. And grounded screen is connected with AC transformer neutral point, the electromagnetic energy that DC power-supply system is launched can be caused directly to reflux AC, the AC-DC coupling resonance produced in various degree is worsened electromagnetic environment further. But, if subway tunnel body structure reinforcing bars is not connected with grounded screen and is individually present, then the energy accumulated cannot discharge; In tunnel, not only produce scatter echo, and scattering electromagnetic wave can be produced from underground and enter urban district. And, traction become once, Secondary Winding all have earth point according to railway technology code, very easily the high-frequency DC pulse electromagnetic wave of electrical network is introduced subway, be also easy to the incoming electrical network of electric pulse EMR electromagnetic resonance produced by the commutator powered to electric locomotive. Therefore, electric power supply system for subway and electrical network are properly isolated from is necessary. " being applied to the suppression resonance circuit of urban track traffic tractive power supply system " utility model patent of application in 2014, have been proposed for this isolation technology scheme, but for current self-existent subway tunnel body structure reinforcing bars, there is certain excessive resistance between earthed system and rail (return current rail) and the performance that occurs the process of mutual Leakage Current, tunnel body structure reinforcing bars to be directly connected to grounded screen or rail judge and adopt be connected through a constant impedance or all have problems through the judgement of high pass filter connected mode performance.
Utility model patent content
The purpose of this utility model is in that to provide the stray electrical current restraining device that in a kind of urban subway tunnel, electric power system loop is revealed, to overcome the defect existed in prior art; This utility model simple in construction, it is easy to accomplish.
For achieving the above object, the technical solution of the utility model is: the stray electrical current restraining device that in a kind of urban subway tunnel, electric power system loop is revealed, including: rail or interval, return current rail direction are laid along subway tunnel battery assembly module and be arranged at the 3rd multiple-connected battery group in the metro traction electric substation 35kV/400V step down side 400V each phase of AC three-phase bus; The first multiple-connected battery group that described battery assembly module is arranged in subway tunnel between rail or return current rail and tunnel body structure reinforcing bars after including series connection and the second multiple-connected battery group.
In this utility model one embodiment, described first multiple-connected battery group, described second multiple-connected battery group and described 3rd multiple-connected battery group are 2V parallel connection lead-acid batteries.
In this utility model one embodiment, the positive pole of described first multiple-connected battery group is connected with the positive pole of described second multiple-connected battery group; The negative pole of described first multiple-connected battery group accesses rail or return current rail in described subway tunnel through the first isolating capacitor; The negative pole of described second multiple-connected battery group accesses described tunnel body structure reinforcing bars through the second isolating capacitor.
In this utility model one embodiment, one end of described first isolating capacitor is connected with the negative pole of described first multiple-connected battery group, and the other end accesses rail or return current rail in described subway tunnel through the first fuse and first exchange the two poles of the earth air switch successively; Described tunnel body structure reinforcing bars is accessed through the second fuse and second exchange the two poles of the earth air switch successively in one end of described second isolating capacitor, and the other end is connected with the negative pole of described second multiple-connected battery group.
In this utility model one embodiment, described first isolating capacitor adopts aluminium electrolutic capacitor; Described second isolation capacitance adopts ceramic capacitor or high frequency capacitor.
In this utility model one embodiment, the positive pole of described 3rd multiple-connected battery group accesses live wire by the 3rd isolating capacitor, and negative pole accesses zero line by the 4th isolating capacitor.
In this utility model one embodiment, described 3rd isolating capacitor accesses live wire through the 3rd fuse and the 3rd exchange the two poles of the earth air switch successively; Described 4th isolating capacitor accesses zero line through the 4th fuse and the 4th exchange the two poles of the earth air switch successively.
In this utility model one embodiment, described 3rd isolating capacitor adopts electrolysis condenser; Described 4th isolating capacitor adopts ceramic capacitor or high frequency capacitor.
Compared to prior art, this utility model has the advantages that the stray electrical current restraining device that in a kind of urban subway tunnel that this utility model is proposed, electric power system loop is revealed, subway distribution system reliability of operation and stability is improved with relatively low investment, original locomotive drive system is launched the collection of energy lost to tunnel and returns the power distribution network power supplying efficiency to improve, be of value to the life-span extending rail (return current rail) and structure reinforcing bars, grounded screen simultaneously. Solve the stray electrical current problem that subway electric locomotive main circuit power supply is revealed and the EMR electromagnetic resonance problem standing electricity consumption low-voltage distribution system with less fund input, be conducive to improving stability, reliability and the safety that railcar runs simultaneously.
Accompanying drawing explanation
Fig. 1 is underground engines electric power system connection diagram in this utility model.
Fig. 2 accesses the electric hookup between rail and tunnel structure reinforcing bar after two groups of multiple-connected battery group reversal connections in this utility model.
Fig. 3 installs lead-acid batteries electric hookup in parallel on station low pressure side 400V AC three-phase bus in this utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical solution of the utility model is specifically described.
As it is shown in figure 1, underground engines power adopts 1500V or 750V DC source inversion to be that three-phase alternating voltage is powered to alternating current motor, and the change of reverse frequency is adopted to regulate road speed. Except in traction substation, commutator produces harmonic wave, the inverter on locomotive is inevitably generated the electromagnetic field of upper frequency. Limited space in tunnel, electromagnetic wave is mainly injected in tunnel body and produces faradism at structure reinforcing bars, when being dispersed on metallic conductor nearby by Leakage Current towards periphery after accumulation energy on reinforcing bar. Rail (return current rail) is metal frame maximum on ground in tunnel, and the spuious distributed current major part of tunnel body structure reinforcing bars flows back to rail (return current rail) from underground; Sub-fraction electric current should be also had to flow into grounded screen in station and to be passed straight back to electric substation's AC. What is desired is that now and tunnel body structure reinforcing bars electric energy is more successfully sent rail (return current rail) back to reduce the electric current being back to AC, and " cistern " of high frequency electric energy is provided, in order to unnecessary energy will not produce the adverse influences such as scattering.
First with being connected on tunnel body structure reinforcing bars after 2V accumulator battery band isolating capacitor in parallel and returning between rail (return current rail). But, accumulator is band DC voltage after all, and in alternating current turn on process, DC voltage also can to a certain degree work; So will necessarily cause and be connected on side of the positive electrode metallic object and have the suspicion of " sacrificial anode ". Therefore, after further the positive pole of two groups of identical 2V parallel connection lead-acid batteries being connected with each other, two ends negative pole is drawn, be connected between tunnel body structure reinforcing bars and time rail (return current rail) through isolating capacitor with DC zero voltage. Now, mainly provide high-frequency ac passage, be mutually isolated with DC quantity, and be substantially free of conflict with the protection of existing frame currents and stray current drainage system. The Capacity Selection of accumulator battery, installation quantity and installation of how layouting in tunnel, and on measuring, protect and control the impact in loop, be required for carrying out selecting according to site specific and arranging.
This utility model provides the stray electrical current restraining device that in a kind of urban subway tunnel, electric power system loop is revealed, after the positive pole of two groups of identical 2V parallel connection lead-acid batteries is connected with each other, two ends negative pole is drawn, this two group storage batteries number of parallel is identical, and one end is connected to tunnel body structure reinforcing bars through isolating capacitor, the other end connects rail (return current rail) through isolating capacitor. Accumulator battery is connected by aluminium electrolutic capacitor isolation with rail (return current rail), and accumulator battery and tunnel body structure reinforcing bars are connected by the ceramic capacitor isolation close with cement constituent or other AC capacitor isolation adopting high frequency characteristics good. In tunnel, spacing at a certain distance installs the lead-acid batteries in parallel that many groups are identical.
Further, in the present embodiment, as shown in Figure 2, subway tunnel accesses through isolating capacitor after two groups of 2V multiple-connected battery group reversal connections of installing and is used for suppressing resonance electric hookup between rail and tunnel body structure reinforcing bars, wherein, lead-acid batteries 1 is identical with lead-acid batteries 2 cell parallel number. After the positive pole of two groups of identical 2V parallel connection lead-acid batteries groups is connected with each other, two ends negative pole is drawn, one end connects rail (return current rail) through isolating capacitor C1 and fuse F1 by air switch KK1, and the other end connects tunnel body structure reinforcing bars through isolating capacitor C2 and fuse F2 by air switch KK1. KK1 is exchange the two poles of the earth air switch. Accumulator battery is connected by aluminium electrolutic capacitor isolation with rail (return current rail), and accumulator battery and tunnel body structure reinforcing bars are connected by the ceramic capacitor isolation close with cement constituent or other capacitor isolation adopting high frequency characteristics good. In tunnel, the no-voltage lead-acid batteries through isolation that many groups are identical is installed at interval at a certain distance. In the present embodiment, it is preferred that accumulator battery should select same model with the product dispatched from the factory batch, to ensure good concordance.
In the present embodiment, Subway Line 1, Fuzhou City has 21 stations, if 11 35kV/DC1500V/400V draw blood pressure lowering mixing electric substation (traction substation and stepdown substation merge) and 13 35kV/400V stepdown substations. Substantially each station Nei Youyige electric substation, and in station, 35kV/400V transformator is selected in electricity consumption. The natural setting Tong Bu with substation ground net of grounded screen in station, if grounded screen in traction substation is considered as no-voltage reference point, then the direct current cathode voltage of rail (return current rail) is negative DC voltage value. Just because of the difference of DC potential, so rail (return current rail) can not be directly connected to tunnel body structure reinforcing bars or grounded screen. Analyzing theoretically, the stray electrical current that rail leaks out flows out from DC loop, it should balance in DC loop. So, the energy that tunnel body structure reinforcing bars absorbs sends rail (return current rail) as an electrical current back to, can play suppression locomotive and launch electromagnetic effect. Be equivalent to a locomotive drive motor induction coil being connected to capacitor in addition and equivalence can become a current-limiting reactor, if being connected from the original transition impedance in capacitive between rail (return current rail) with tunnel body structure reinforcing bars and developing into use accumulator battery connection, the inductance value being equivalent to this current-limiting reactor is changed from small to big. Now, on transition impedance, the total reactance value in shnt capacitor meeting increasing circuit naturally, is equivalent to current-limiting reactor and increases. But the more important thing is that accumulator battery has the effect absorbing dynamic resonance current energy, change the dynamic parameter in locomotive load wave process and make the state of original easily generation resonance be suppressed, thus resonance degree is greatly reduced. And grounded screen is connected with substation ground net in station, belong to the some of AC system, it should the unified technical measures considering to suppress resonance and absorption stray electrical current in ac circuit. So, it should installing one group of parallel connection 2V lead-acid batteries in each phase of 35kV/400V station local coordinate frame low-pressure side three-phase 400V, alternating current 220V phase voltage loop is accessed with after different capacitor isolation respectively in battery the two poles of the earth.
Further, in the present embodiment, each phase of electric substation 35kV/400V station local coordinate frame low-pressure side three-phase 400V is installed one group of parallel connection 2V lead-acid batteries, is mainly used in absorbing the resonance of the stray electrical current suppression station low-voltage distribution system simultaneously of grounded screen. Isolating capacitor hot side selects the capacitor that electrolysis condenser, neutral side Ceramics capacitor or altofrequency characteristic are good. In the present embodiment, it is preferred that accumulator battery should select same model with the product dispatched from the factory batch, to ensure good concordance. In equipment mounting technique, accumulator battery should be placed on the ground being covered with felt pad, and be as far as possible arranged on bottom and do not have on the ground of reinforcing bar; According to correlation technique regulatory requirements, the insulation resistance of accumulator is not less than 200k ��, and effective when having grounded screen in underground, the AC capacitor isolation that the capacitor accessing zero line must use high frequency characteristics good, and press 500V D.C. resistance more than 200k �� selection.
Further, in the present embodiment, as it is shown on figure 3, the metro traction electric substation station low pressure side 400V each phase of AC three-phase bus is installed one group of parallel connection lead-acid batteries suppress resonance electric hookup. Each phase of electric substation 35kV/400V station local coordinate frame low-pressure side three-phase 400V is installed one group of parallel connection 2V lead-acid batteries, is mainly used in absorbing the resonance of the stray electrical current suppression station low-voltage distribution system simultaneously of grounded screen. Isolating capacitor C3 hot side selects the capacitor that electrolysis condenser, isolating capacitor C4 neutral side Ceramics capacitor or altofrequency characteristic are good. Isolating capacitor C3 accesses live wire through fuse F3 and air switch KK2, and isolating capacitor C4 accesses live wire through fuse F4 and air switch KK2. In the present embodiment, it is preferred that in equipment mounting technique, accumulator battery should be placed on the ground being covered with felt pad, and be as far as possible arranged on bottom and do not have on the ground of reinforcing bar; According to correlation technique regulatory requirements, the insulation resistance of accumulator is not less than 200k ��, and effective when having grounded screen in underground, the AC capacitor isolation that the capacitor accessing zero line must use high frequency characteristics good, and press 500V D.C. resistance more than 200k �� selection.
Further, in the present embodiment, when carrying out field apparatus erection, it is necessary to carry out the AC impedance frequency characteristic test between rail (return current rail) and tunnel body structure reinforcing bars. But subway line is usually constructed with more than tens kilometers, rail (return current rail) is connection completely, and tunnel body reinforcing bar is also be connected completely. Signal is added in capacity all wretched insufficiencies on rail (return current rail) and tunnel body reinforcing bar by the instrument of all test classes, just as finding that miniature instrument measured value is all seriously less than normal when measuring Power Plant Main Transformer insulation with Insulation Resistance Tester. And now network measures excessive resistance only 0.5 ����1.5 �� between grounded screen in tunnel, rail (return current rail) and tunnel body structure reinforcing bars three about technical data introduction with instrument for measuring DC resistance, it is clear that testing crew does not consider that the carrying load ability of test apparatus causes serious measurement error. If load voltage and electric current when utilizing locomotive operation carry out spectrum measurement, it is important to the difference between current between bad differentiation both positive and negative polarity flows into the ratio of tunnel body structure reinforcing bars, grounded screen and other metal pipe line. But, locomotive leaves when having, with a certain distance from station, the interlude being in two stations, and the ratio that affects of grounded screen and other metal pipe line reduces with regard to club. So, utilize the voltage difference between difference between current and negative pole and the tunnel body structure reinforcing bars between the chance spectrum analyzer test both positive and negative polarity of one group of locomotive trail run after subway maintenance, and the voltage of different frequency, electric current spectral line after subtracting each other with no load test value, are carried out analytical calculation and can draw the frequency characteristic of AC impedance. Owing to one part of current is leaked on other object, actual impedance frequency characteristic curve can be higher than these test data. It should be noted that whether test lead and instrument are disturbed during test. The traction substation ac impedance measurement becoming 400V power distribution network used also cannot carry out when power failure, three-phase voltage and electric current can only be tested equally when on-load with spectrum analyzer, and be analyzed calculating the frequency characteristic that can draw AC impedance by the voltage of different frequency, electric current spectral line. It should also be noted that whether test lead and instrument are disturbed during test. In tunnel, the no-voltage accumulator battery through isolation is installed at interval at a certain distance, and the place an order spacing distance of group storage battery capacity and different group storage battery groups of the accumulator battery total capacity controlled condition installed at whole piece subway line in theory has optimum. It is also contemplated that two groups of locomotives cross limit load when, the backflow nearby of Leakage Current. When single group storage battery capacity is enough to absorb two groups of locomotive Leakage Currents, when two cars meet at two group storage batteries middle, Leakage Current flow back into the shortest path of rail from tunnel body structure reinforcing bars.
It is above preferred embodiment of the present utility model, all changes made according to technical solutions of the utility model, when produced function is without departing from the scope of technical solutions of the utility model, belong to protection domain of the present utility model.
Claims (8)
1. the stray electrical current restraining device that in a urban subway tunnel, electric power system loop is revealed, it is characterized in that, including: rail or interval, return current rail direction are laid along subway tunnel battery assembly module and be arranged at the 3rd multiple-connected battery group in the metro traction electric substation 35kV/400V step down side 400V each phase of AC three-phase bus; The first multiple-connected battery group that described battery assembly module is arranged in subway tunnel between rail or return current rail and tunnel body structure reinforcing bars after including series connection and the second multiple-connected battery group.
2. the stray electrical current restraining device that in urban subway tunnel according to claim 1, electric power system loop is revealed, it is characterized in that, described first multiple-connected battery group, described second multiple-connected battery group and described 3rd multiple-connected battery group are 2V parallel connection lead-acid batteries.
3. the stray electrical current restraining device that in urban subway tunnel according to claim 1, electric power system loop is revealed, it is characterised in that the positive pole of described first multiple-connected battery group is connected with the positive pole of described second multiple-connected battery group; The negative pole of described first multiple-connected battery group accesses rail or return current rail in described subway tunnel through the first isolating capacitor; The negative pole of described second multiple-connected battery group accesses described tunnel body structure reinforcing bars through the second isolating capacitor.
4. the stray electrical current restraining device that in urban subway tunnel according to claim 3, electric power system loop is revealed, it is characterized in that, one end of described first isolating capacitor is connected with the negative pole of described first multiple-connected battery group, and the other end accesses rail or return current rail in described subway tunnel through the first fuse and first exchange the two poles of the earth air switch successively; Described tunnel body structure reinforcing bars is accessed through the second fuse and second exchange the two poles of the earth air switch successively in one end of described second isolating capacitor, and the other end is connected with the negative pole of described second multiple-connected battery group.
5. the stray electrical current restraining device that in urban subway tunnel according to claim 3, electric power system loop is revealed, it is characterised in that described first isolating capacitor adopts aluminium electrolutic capacitor; Described second isolation capacitance adopts ceramic capacitor or high frequency capacitor.
6. the stray electrical current restraining device that in urban subway tunnel according to claim 1, electric power system loop is revealed, it is characterized in that, the positive pole of described 3rd multiple-connected battery group accesses live wire by the 3rd isolating capacitor, and negative pole accesses zero line by the 4th isolating capacitor.
7. the stray electrical current restraining device that in urban subway tunnel according to claim 6, electric power system loop is revealed, it is characterised in that described 3rd isolating capacitor accesses live wire through the 3rd fuse and the 3rd exchange the two poles of the earth air switch successively; Described 4th isolating capacitor accesses zero line through the 4th fuse and the 4th exchange the two poles of the earth air switch successively.
8. the stray electrical current restraining device that in urban subway tunnel according to claim 6, electric power system loop is revealed, it is characterised in that described 3rd isolating capacitor adopts electrolysis condenser; Described 4th isolating capacitor adopts ceramic capacitor or high frequency capacitor.
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| CN201521060426.2U CN205283114U (en) | 2015-12-17 | 2015-12-17 | Stray current suppression device that power supply system revealed in return circuit among subway tunnel of city |
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| CN201521060426.2U CN205283114U (en) | 2015-12-17 | 2015-12-17 | Stray current suppression device that power supply system revealed in return circuit among subway tunnel of city |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576847A (en) * | 2017-09-07 | 2018-01-12 | 西南交通大学 | A kind of vehicular tractive power supply system impedance frequency characteristic measurement apparatus and its measuring method |
| CN109094427A (en) * | 2018-08-23 | 2018-12-28 | 南京铁道职业技术学院 | Metro stray current based on voltage compensation inhibits system and method |
| CN116047363A (en) * | 2023-04-03 | 2023-05-02 | 华东交通大学 | Method and system for monitoring stray current of rail train |
-
2015
- 2015-12-17 CN CN201521060426.2U patent/CN205283114U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576847A (en) * | 2017-09-07 | 2018-01-12 | 西南交通大学 | A kind of vehicular tractive power supply system impedance frequency characteristic measurement apparatus and its measuring method |
| CN107576847B (en) * | 2017-09-07 | 2024-04-26 | 西南交通大学 | Impedance frequency characteristic measuring device and measuring method for vehicle-mounted traction power supply system |
| CN109094427A (en) * | 2018-08-23 | 2018-12-28 | 南京铁道职业技术学院 | Metro stray current based on voltage compensation inhibits system and method |
| CN109094427B (en) * | 2018-08-23 | 2023-09-22 | 南京铁道职业技术学院 | Subway stray current suppression system and method based on voltage compensation |
| CN116047363A (en) * | 2023-04-03 | 2023-05-02 | 华东交通大学 | Method and system for monitoring stray current of rail train |
| CN116047363B (en) * | 2023-04-03 | 2023-08-18 | 华东交通大学 | Method and system for monitoring stray current of rail train |
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