CN212543370U - Suppression device for power supply cable to track circuit harmonic space induction interference - Google Patents
Suppression device for power supply cable to track circuit harmonic space induction interference Download PDFInfo
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- CN212543370U CN212543370U CN202022200888.7U CN202022200888U CN212543370U CN 212543370 U CN212543370 U CN 212543370U CN 202022200888 U CN202022200888 U CN 202022200888U CN 212543370 U CN212543370 U CN 212543370U
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Abstract
The application discloses suppression device of power supply cable to track circuit harmonic space induction interference, the device is applied to the transformer substation of the traction power supply system of railway system, subregion institute or switching station, include a filter circuit specifically AT least, set up a filter circuit respectively between the contact wire of power supply arm and rail and between positive feeder and rail promptly under AT power supply mode, set up a filter circuit between the contact wire of power supply arm and rail under direct power supply mode, can filter the higher harmonic in the traction power supply system through filter circuit, just so can not transmit to the power supply cable and cause the space induction interference to the track circuit, thereby avoided producing the influence to the normal work of signal equipment.
Description
Technical Field
The application relates to the technical field of railways, in particular to a suppression device for harmonic space induction interference of a power supply cable to a track circuit.
Background
With the progress of power electronic technology, the AC-DC-AC technology based on fully-controlled devices such as GTO, IGBT, IGCT and the like is widely applied to electric locomotives and motor train units, the power factor is close to 1, the current quality is also improved, and the harmonic current in low frequency bands of 3, 5, 7 and the like is remarkably reduced.
However, in practice, the applicant of the present application has found that higher harmonics in higher frequency bands (e.g. 20 th order or more) increase while the low frequency band harmonic currents decrease. As shown in fig. 1, when the higher harmonics emitted by the locomotive propagate in the power cable, the higher harmonics may interfere with the transmission of the nearby track circuit signal, i.e. an induced electromotive force is generated in the signal cable, thereby causing the signal equipment to fail to work normally.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a device for suppressing the harmonic space induced interference of the power cable to the track circuit, so as to suppress the higher harmonics and avoid affecting the normal operation of the signal equipment.
In order to achieve the above object, the following solutions are proposed:
a suppression device for harmonic space induced interference of a power supply cable on a track circuit is applied to a substation, a subarea station or a switching station of a traction power supply system of a railway system, and comprises at least one passive filter circuit, wherein:
in an AT power supply mode, one passive filter circuit is connected between a contact line of a power supply arm and a terminal of a steel rail in parallel, and the other passive filter circuit is connected between a positive feeder line of the power supply arm and the steel rail in parallel;
in the direct power supply mode, the passive filter circuit is connected in parallel between the contact line of the power supply arm and the steel rail.
Optionally, the passive filter circuit is a third-order high-pass filter circuit.
Optionally, the third-order high-pass filter circuit includes a first capacitor, a third capacitor, a resistor, and a reactor, where:
one end of the first capacitor is connected with the contact line, and the other end of the first capacitor is respectively connected with one end of the third capacitor and one end of the reactor;
the other end of the third capacitor is connected with one end of the resistor;
the other end of the resistor is connected with the other end of the reactor and the steel rail respectively.
Optionally, the third-order high-pass filter circuit further includes a discharge coil, wherein:
the first discharge coil is connected in parallel with the first capacitor.
Optionally, the third-order high-pass filter circuit further includes a circuit breaker and a lightning arrester, wherein:
the circuit breaker is arranged on a connecting line for connecting the first capacitor and the contact line;
one end of the lightning arrester is connected with the lower end of the breaker, and the other end of the lightning arrester is grounded.
It can be seen from the above technical solutions that the present application discloses a device for suppressing spatial induced interference of a power supply cable to a harmonic of a track circuit, which is applied to a substation, a section station or a switching station of a traction power supply system of a railway system, and specifically includes AT least one filter circuit, i.e., a filter circuit is respectively disposed between a contact line and a steel rail of a power supply arm and between a positive feed line and a steel rail in an AT power supply mode, and a filter circuit is disposed between a contact line and a steel rail of a power supply arm in a direct power supply mode, so that higher harmonics in the traction power supply system can be filtered out by the filter circuit, and thus spatial induced interference to a signal cable by the power supply cable is not caused, thereby avoiding influence on normal operation of signal equipment.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of harmonic induced interference on a track circuit;
FIG. 2 is a schematic view of an installation of a restraint device according to an embodiment of the present application;
FIG. 3 is a schematic view of another restraint device of the disclosed embodiment;
FIG. 4 is a schematic view of an alternative restraint device according to an embodiment of the present application;
FIG. 5 is a circuit diagram of a filter circuit according to an embodiment of the present application;
FIG. 6 is a circuit diagram of another filtering circuit according to an embodiment of the present application;
FIG. 7 is a circuit diagram of another filtering circuit according to an embodiment of the present application;
fig. 8 is a circuit diagram of another filter circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 2 is a schematic diagram illustrating an installation of a harmonic suppression device according to an embodiment of the present application.
As shown in fig. 2, the harmonic suppression device according to the present embodiment is applied to a railway system, and is specifically installed in a substation, a section station, an open/close station, or the like of a traction power supply system of the railway system. In particular, the higher harmonic suppression means comprise at least one passive filter circuit. For the present embodiment, the number of passive filter circuits is one or two.
When the railway system adopts an AT power supply mode, two passive filter circuits need to be selected, as shown in fig. 3, one end of one passive filter circuit is connected with a contact line of a power supply arm, and the other end of the passive filter circuit is connected with a contact point on a steel rail; one end of the other passive filter circuit is connected with the positive feeder of the power supply arm, and the other end of the other passive filter circuit is connected with a contact point on the steel rail.
The AT power supply mode is a power supply mode of electric traction, is also called as an autotransformer power supply mode, and is a power supply mode provided with an autotransformer and adopted by a single-phase power frequency alternating current electrified railway for improving power supply quality and reducing interference on communication.
The special equipment for AT power supply mainly has a positive feeder line parallel to the contact line and low impedance autotransformers arranged AT regular intervals. The positive feed line is a path for returning traction load to the substation, and the allowable current capacity of the positive feed line is equivalent to the allowable current capacity of the contact line. The turn ratio of the first winding to the second winding of the autotransformer is 2:1, one end of the autotransformer is connected with the contact line, the other end of the autotransformer is connected with the positive feeder, and the middle point of the autotransformer is connected with the neutral point of the steel rail or the choke transformer. The voltages to the ground of the contact line and the positive feeder line are equal, and the voltage between the contact line and the positive feeder line is 2 times of the voltage to the ground of the contact line and the positive feeder line.
When the railway system adopts a direct power supply mode, the requirement can be met only by one passive filter circuit, and as shown in fig. 4, one end of the passive filter circuit is connected with a contact line of a power supply arm, and the other end of the passive filter circuit is connected with a contact point on a steel rail.
The direct power supply mode is a traction network power supply mode with steel rails as main traction backflow paths. Two more common forms: one is a simple direct power supply mode (T-R mode) using steel rail as return conductor, and the other is a direct power supply mode (T-R-NF mode) with return line, in which a return line is added in the return system and is connected with the steel rail in parallel every 3-4 km.
The T-R-NF mode is slightly superior to the T-R mode in preventing the interference influence on the parallel approach communication lines. The interference effect is generally evaluated by the trailed net shading coefficient. The shielding coefficient is the ratio of the return component of the traction return flow to the total traction current.
The traction net in the direct power supply mode has simple structure, low manufacturing cost and convenient construction, operation and maintenance; in addition, the unit impedance of the traction network is small, and the voltage loss and the power loss of the traction network are small; however, the backflow component leaking into the ground through the transverse transition resistance between the rail and the ground is large, so that the ground potential of the steel rail is increased, and sometimes, a steel rail potential suppression measure needs to be taken to ensure safety.
No matter the AT power supply mode or the direct power supply mode is adopted, the neutral point of the choke transformer arranged on the steel rail is selected as the contact point on the steel rail.
Through the filter circuit connected in parallel between the contact line or the positive feeder and the steel rail, higher harmonics between the contact line and the steel rail and/or between the positive feeder and the steel rail can be filtered, and the filtered current frequency is higher harmonic current of 550-850 Hz and 1500-3000 Hz.
It can be seen from the above technical solutions that the present embodiment provides a higher harmonic suppression apparatus, which is applied to a substation, a section station or a switching station of a traction power supply system of a railway system, and specifically includes AT least one filter circuit, that is, a filter circuit is respectively disposed between a contact line of a power supply arm and a steel rail and between a positive feeder line and the steel rail in an AT power supply mode, and a filter circuit is disposed between the contact line of the power supply arm and the steel rail in a direct power supply mode, so that higher harmonics in the traction power supply system can be filtered by the filter circuit, and thus no space induced interference is caused to a track circuit by transmission to a power supply cable, thereby avoiding an influence on normal operation of signal equipment.
The passive filter circuit in this embodiment specifically uses a third-order high-pass filter circuit, and the third-order high-pass filter circuit includes a first capacitor C1, a third capacitor C3, a resistor R, and a reactor L, as shown in fig. 5.
One end of the first capacitor is connected with a contact line or a positive feeder line on the power supply arm, the other end of the first capacitor is connected with one end of the third capacitor and one end of the reactor respectively, the other end of the third capacitor is connected with one end of the resistor, the other end of the resistor is connected with the other end of the reactor, and the other end of the resistor is also connected with a terminal, namely, a steel rail of a railway system or a neutral point of a choke transformer arranged on the steel rail is connected.
The parameter design method of the third-order high-pass filter is as follows:
c1+ C2 ═ C3 ═ C,
the reactive compensation capacity Q of the third-order high-pass filter and the tuning harmonic number n of the filterHTo determine a capacitance value C, where ω0As fundamental frequency:
selecting the frequency with the total reactance of the third-order high-pass filter being 0 as a tuning point of the filter, and calculating the inductance value L according to the following formula:
the resistance value R is calculated by the following formula, wherein qHFor the filter quality factor:
qH＝nHω0RC
in order to inhibit the space inductive interference of higher harmonics on a track circuit and a signal cable, considering that the higher harmonic interference inhibition frequency band is mainly a signal working frequency band (550-850 Hz and 1500-3000 Hz), the value range of C of a third-order high-pass filter is designed to be 1.252-4.174 uF, the value range of L is 0.0201-0.0669H, and the value range of R is 6.24-20.79 omega.
In addition, the third order high pass filter circuit also includes a discharge coil TV1, as shown in fig. 6. The discharge coil and the first capacitor are used for protecting the first capacitor.
Also, the passive filter circuit further includes a circuit breaker QF and a surge arrester F, as shown in fig. 7 and 8. The circuit breaker is arranged on a conductor for connecting one end of the first capacitor to a contact line/positive feeder, and thus opens in the presence of an overcurrent or overvoltage, acting as a protection for the capacitor, resistor and inductor.
One end of the lightning arrester is connected with the lower end of the circuit breaker, namely the connection point of the circuit breaker and the first capacitor, and the other end of the lightning arrester is grounded, so that the high current can be discharged under the condition that the contact line or the positive feeder line is struck by lightning, and the effect of protecting the capacitor, the resistor and the inductor under the contact line or the positive feeder line is achieved.
For the convenience of describing the connection situation of the suppression device for the harmonic space induced interference of the power supply cable to the track circuit in the railway system, the configuration of the suppression device is simplified, wherein only the core configuration of the suppression device provided by the embodiment of the present application is shown in the shown scene, and other details are not shown.
Example two
The present embodiment provides a power supply system for a railway system.
The power supply system is provided with the device for suppressing the harmonic space induced interference of the power supply cable on the track circuit provided by the previous embodiment. The suppression device is applied to a substation, a subarea station or a switching station of a traction power supply system of a railway system, and particularly comprises AT least one filter circuit, namely, the filter circuits are respectively arranged between a contact line and a steel rail of a power supply arm and between a positive feeder and the steel rail in an AT power supply mode, the filter circuit is arranged between the contact line and the steel rail of the power supply arm in a direct power supply mode, and higher harmonics on a loop between the contact line/the positive feeder and the steel rail can be filtered through the filter circuit, so that the interference on a signal cable can not be caused, and the influence on the normal work of signal equipment is avoided.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (5)
1. A suppression device of harmonic space induced interference of a power supply cable to a track circuit, applied to a substation, a subarea station or a switching station of a traction power supply system of a railway system, characterized in that the suppression device comprises at least one passive filter circuit, wherein:
in an AT power supply mode, one passive filter circuit is connected between a contact line of a power supply arm and a terminal of a steel rail in parallel, and the other passive filter circuit is connected between a positive feeder line of the power supply arm and the steel rail in parallel;
in the direct power supply mode, the passive filter circuit is connected in parallel between the contact line of the power supply arm and the steel rail.
2. The suppression apparatus of claim 1, wherein the passive filtering circuit is a third order high pass filtering circuit.
3. The suppression apparatus of claim 2, wherein the third order high pass filter circuit comprises a first capacitor, a third capacitor, a resistor, and a reactor, wherein:
one end of the first capacitor is connected with the contact line, and the other end of the first capacitor is respectively connected with one end of the third capacitor and one end of the reactor;
the other end of the third capacitor is connected with one end of the resistor;
the other end of the resistor is connected with the other end of the reactor and the steel rail respectively.
4. The suppression apparatus of claim 3, wherein the third order high pass filter circuit further comprises a discharge coil, wherein:
the discharge coil is connected in parallel with the first capacitor.
5. The suppression apparatus of claim 3, wherein the third order high pass filter circuit further comprises a circuit breaker and a lightning arrester, wherein:
the circuit breaker is arranged on a connecting line for connecting the first capacitor and the contact line;
one end of the lightning arrester is connected with the lower end of the breaker, and the other end of the lightning arrester is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022200888.7U CN212543370U (en) | 2020-09-29 | 2020-09-29 | Suppression device for power supply cable to track circuit harmonic space induction interference |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022200888.7U CN212543370U (en) | 2020-09-29 | 2020-09-29 | Suppression device for power supply cable to track circuit harmonic space induction interference |
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| CN212543370U true CN212543370U (en) | 2021-02-12 |
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| CN202022200888.7U Active CN212543370U (en) | 2020-09-29 | 2020-09-29 | Suppression device for power supply cable to track circuit harmonic space induction interference |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211123 Address after: 102613 No.456, langlongsi village, Huangcun Town, Daxing District, Beijing Patentee after: BEIJING RAILWAY SIGNAL Co.,Ltd. Address before: 102613 No.456, langlongsi village, Huangcun Town, Daxing District, Beijing Patentee before: Rail Transit Technology Research Institute of Tonghao (Beijing) Rail Industry Group Co.,Ltd. Patentee before: China Communications (Beijing) Railway Industry Group Co., Ltd |
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