CN109572490B - Method and device for obtaining accurate time of train in-out joint type electric phase splitting - Google Patents
Method and device for obtaining accurate time of train in-out joint type electric phase splitting Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for acquiring the accurate electric phase splitting time of a train in and out joint, which adopt different differential signal source application and configuration methods to realize the judgment function of the lap joint time, can reliably obtain the lap joint time, judge and obtain the short circuit time through electric conduction, are more reliable and quicker than the judgment based on the geometric shape, can realize the function without adopting a special industrial sensor or other specially manufactured universal devices, have high cost performance and are easy to popularize and apply. The microsecond-level quick judgment and the given electric signal can be directly used as a starting signal for the working state conversion of power electronic and other power converter devices or used as other starting signals.
Description
Technical Field
The embodiment of the invention relates to the technical field of traction power supply of an electrified railway contact network, in particular to a method and a device for acquiring accurate time of an articulated electric phase separation of a train in and out.
Background
An electrified railway contact net is an overhead power grid for providing power for train operation, and is in contact with a pantograph on a train in a high-speed movement process in a relatively parallel sliding mode, and current and power conduction is realized through proper pressure between the pantograph and the net (contact line). In order to overcome the influence of natural temperature change on the internal tension and the geometric parallel position state of the overhead contact line, an anchor section joint structure is adopted, and one of the structural characteristics is that the parallel section of two horizontal contact wires which can be simultaneously contacted by a pantograph is arranged. Therefore, on the premise that the anchor sections are separated from each other mechanically and isolated from each other electrically in a segmented manner, continuous forward electric energy is obtained by instantaneously and transversely lapping the parallel sections at the same time through the pantograph of the train, namely lapping two electrified contact net suspension working branches. The anchor segment joint parallel segments of a general catenary are parallel in a plan view, and are seen as cross segments or equal-height segments from the upper side of the vertical plane, as in the structure of fig. 2. It should be noted that, because the pantograph of the train running at a high speed normally keeps moving forward under the conditions of the continuous vibration amplitude (approximately different from 20 to 200 mm) and the continuous lifting pressure (approximately in the range of 50 to 300N) under the influence of various factors, the time for lapping or the starting time and the ending time of lapping are randomly changed when the pantograph passes through a parallel section in actual work; in the prior art, a method for obtaining a parallel section moment of a train pantograph lapped contact network anchor section joint through a specific static geometry current situation is adopted, a static equal-height section which takes a structural center of the anchor section joint as an axial direction and extends from two sides under a static situation can be changed into a dynamic equal-height range (a large amount) of the parallel section as shown in fig. 1 under a dynamic situation. If the maximum allowable lifting amount of 200mm is calculated when the overhead line system runs at 350km/h, the distance difference of the parallel sections can be 10m (more than 2 times) for the anchor section joint of the overhead line system in the standard design. If the overlap time is obtained by using the position of the parallel segment of the static geometrical dimension as the actual dynamic origin-destination calculation, the absolute error of the time is more than 100 ms.
According to a single-phase power frequency alternating current power supply system adopted by an electrified railway in China, an isolation region of neutral electric phase splitting of about 200-900 m exists every 30-60 km, and the isolation region is called electric phase splitting. Under the condition of high-speed operation, the electric phase splitting of the contact network usually adopts an anchor section articulated structure, a neutral section which is intentionally not communicated with a power supply with two ends and runs through is formed in the middle of the two anchor section articulated structures, namely a so-called middle dead zone or neutral section, so that a pantograph which runs at high speed can smoothly pass through in a contact manner, and meanwhile, the safety isolation between electric energy flows with different phases at two ends of the neutral zone is kept.
In order to solve the limitation problem of the application of the electrified railway train in the power failure passing through the neutral section, aiming at some defects of the ground mechanical switch automatic switching passing through the neutral section technology (an electroless dead zone exists, so that the problems of overvoltage and overcurrent impact and the like are still brought to the train), in recent years, researches on the ground electronic switch based automatic switching passing through the neutral section technology are also carried out by related mechanisms, and the researches comprise the researches on schemes of an electrified railway ground electric neutral section continuous power supply system or an electrified railway ground electric neutral section flexible power supply system and the like. In the schemes, the position of the train, the moment when the pantograph of the train passes through and simultaneously laps or leaves the parallel section double-branch lead and the length of lapping duration are required to be judged and used as the basis for controlling the process or judging and starting the control strategy. If used as a control signal based on an ac-dc-ac power converter, a fast response of at least the cycle stage is required.
Disclosure of Invention
Embodiments of the present invention provide a method and apparatus for obtaining precise time of train entering and exiting articulated electrical phase separation that overcomes or at least partially solves the above-mentioned problems.
In a first aspect, an embodiment of the present invention provides a method for obtaining an accurate time of an articulated electrical phase separation of a train, including:
respectively sending a first characteristic signal and a second characteristic signal on different contact network leads of the electrically isolated parallel sections;
when the first characteristic signal is received on the overhead line system lead where the first characteristic signal is located, if the second characteristic signal is received at the same time, the moment when the second characteristic signal is received is judged to be the moment when the pantograph slide plate is conducted with the parallel section.
Preferably, the second characteristic signal is a 50Hz frequency characteristic signal, and the first characteristic signal is a 49Hz frequency characteristic signal or a 52Hz frequency characteristic signal.
Preferably, if the second characteristic signal is received at the same time, the method specifically includes:
if an input signal which is different from the first characteristic signal is received, judging whether the characteristic of the input signal is the same as the preset characteristic of a second characteristic signal or not, and judging that the second characteristic signal is received.
Preferably, the transmission device of the first characteristic signal is connected to a neutral catenary working leg of the articulated electrical phase separation of the anchor section, and the transmission device of the second characteristic signal is connected to a power supply side catenary working leg at a far end from the train entering direction.
Preferably, the method further comprises transmitting a third characteristic signal on a power supply side overhead line system working branch with the train running-out direction being a far end.
In a second aspect, an embodiment of the present invention provides an apparatus for obtaining accurate time of an articulated electrical phase separation of a train, including a first signal source, a second signal source, and a signal acquisition and analysis apparatus;
the first signal source and the second signal source are respectively connected with different electrically isolated parallel contact net conducting wires, the signal acquisition and analysis device is connected with the first signal source in an equipotential manner, and the signal acquisition and analysis device is connected with the contact net conducting wire connected with the second signal source;
the first signal source is used for sending a first characteristic signal, and the second signal source is used for sending a second characteristic signal;
and the signal acquisition and analysis device is used for receiving the first characteristic signal on the overhead line system lead where the first characteristic signal is located, and judging that the moment when the second characteristic signal is received is the moment when the pantograph slide plate is switched on the parallel section if the second characteristic signal is received at the same time.
Preferably, the second characteristic signal is a 50Hz frequency characteristic signal, and the first characteristic signal is a 49Hz frequency characteristic signal or a 52Hz frequency characteristic signal.
Preferably, the signal acquisition and analysis device is configured to, if an input signal different from the first characteristic signal is received, determine whether a characteristic of the input signal is the same as a characteristic of a preset second characteristic signal, and determine that the second characteristic signal is received.
Preferably, the first signal source is connected to a neutral contact net working branch of the anchor section articulated electric phase separation, and the second signal source is connected to a power supply side contact net working branch far away from the train driving direction position.
Preferably, the train protection device further comprises a third signal source connected to a working branch of a contact network at a power supply side with a far end in the train running-out direction, wherein the third signal source is used for sending a third characteristic signal; and the signal acquisition and analysis device is connected with a contact net work branch connected with a third signal source.
The embodiment of the invention provides a method and a device for acquiring the accurate electric phase splitting time of the in-out joint of a train, which adopt different differential signal source application and configuration methods to realize the judgment function of the lapping time, not only can reliably obtain the lapping time, but also judge and obtain the short-circuit time through electric conduction, and are more reliable and quicker than the judgment based on the geometric shape, the signal response time can reach the microsecond level, the error is also in the microsecond level. The microsecond-level quick judgment and the given electric signal can be directly used as a starting signal for the working state conversion of power electronic and other power converter devices or used as other starting signals.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a method for obtaining a time of a parallel section of an anchor section joint of a train pantograph overlapping catenary according to a static geometry current situation in the prior art;
FIG. 2 is a view of a parallel section of an anchor section joint of a contact net in the prior art;
FIG. 3 is a schematic diagram of a method for obtaining precise time of the electric phase separation of the train in and out joint according to the embodiment of the invention;
FIG. 4 is a schematic diagram of an apparatus for obtaining precise time of train entering and exiting articulated electrical phase separation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Because the pantograph of the train running at high speed normally keeps moving forward under the conditions of continuous vibration amplitude (approximately different from 20-200 mm) and continuous lifting pressure (approximately in the range of 50-300N) under the influence of various factors, the time for lapping or the starting time and the ending time of lapping are randomly changed when the pantograph passes through a parallel section in actual work.
If the maximum allowable lifting amount of 200mm is calculated when the overhead line system runs at 350km/h, the distance difference of the parallel sections can be 10m (more than 2 times) aiming at the standard designed overhead line system anchor section joint. If the overlap time is obtained by using the position of the parallel segment of the static geometrical dimension as the actual dynamic origin-destination calculation, the absolute error of the time is more than 100 ms.
In the prior art, a research about an automatic switching passing neutral section technology is that the position of a train, the moment when a pantograph of the train passes through and simultaneously laps or leaves a parallel section double-branch lead and the length of lapping duration are required to be judged as a basis for a control process or a judgment and starting control strategy. If used as a control signal based on an ac-dc-ac power converter, at least a fast response of the cycle stage is required,
because the position of the parallel section with the static geometric dimension is used as the actual dynamic origin-destination point to calculate and obtain the lapping time, and the error is larger, the embodiment of the invention realizes the function of judging the lapping time by adopting different application and configuration methods of differential signal sources, not only can reliably obtain the lapping time, but also judges and obtains the short-circuit time through electrical conduction, and judges and obtains the short-circuit time through electrical conduction, which is more reliable and quicker than the judgment based on the geometric shape. The following description and description will proceed with reference being made to various embodiments.
Fig. 3 is a method for obtaining accurate time of an articulated electrical phase separation of a train according to an embodiment of the present invention, including:
s1, respectively sending a first characteristic signal and a second characteristic signal on different contact net wires of the electrically isolated parallel section;
and S2, when the first characteristic signal is received on the overhead line system lead where the first characteristic signal is located, if the second characteristic signal is received at the same time, the moment when the second characteristic signal is received is judged to be the moment when the pantograph slide plate is conducted on the parallel section.
In this embodiment, the sending devices of the first characteristic signal and the second characteristic signal should be respectively connected to two different catenary wires of the electrically isolated parallel sections (i.e. the parallel section 1 and the parallel section 2 in fig. 2); the device capable of recognizing the first characteristic signal is connected to the contact system wire connected with the second characteristic signal. When different signals are sensed to be input and recognized to have the same inherent second characteristic signal as the inherent second characteristic signal stipulated in advance, the moment can be instantly judged to be the moment when the pantograph slide plate conducts the two parallel sections. The reason is that just because the pantograph slide plate is short-circuited with the parallel sections of the two branches at the moment, the second characteristic signal on the far-end working branch which is originally electrically separated is transmitted to the near-end contact net working branch loop where the first characteristic signal is located through the pantograph slide plate. By this determination, the moment is the moment when the pantograph is conducted on the two parallel segments simultaneously, the signal response time can reach a fast microsecond level, and the error is also in the microsecond level.
On the basis of the above embodiment, the second characteristic signal is a 50Hz frequency characteristic signal, and the first characteristic signal is a 49Hz frequency characteristic signal or a 52Hz frequency characteristic signal.
In this embodiment, the second characteristic signal is an inherent 50Hz frequency characteristic signal of a power frequency power supply in the standard of China, and the first characteristic signal should generate or be a signal different from the inherent characteristic of the signal source 1, such as an inherent 49Hz or 52Hz frequency characteristic signal (which is intentionally set to be different from the standard power frequency 50Hz), and serve as a small abnormal signal with a certain component superimposed in a large power supply system for electrified power supply, without affecting the quality of the power supply (still meeting the national standard).
On the basis of the foregoing embodiments, if the second characteristic signal is received at the same time, the method specifically includes:
if an input signal which is different from the first characteristic signal is received, judging whether the characteristic of the input signal is the same as the preset characteristic of a second characteristic signal or not, and judging that the second characteristic signal is received.
In addition to the above embodiments, the transmission device of the first characteristic signal is connected to a neutral catenary working branch of the anchor section articulated electrical phase separation, and the transmission device of the second characteristic signal is connected to a power supply side catenary working branch at a far end from the train entering direction.
On the basis of the above embodiments, the method further includes transmitting a third characteristic signal on a power supply side overhead line system working branch with the train exit direction being a far end.
The second characteristic signal is connected to a power supply side contact net working support at the far end of the coming train direction (suitable for the condition that the train enters from the left side or suitable for the condition that the train leaves from the neutral zone and drives to the far side), and the first characteristic signal is connected to a neutral zone contact net working support of the anchor section articulated electric phase separation. The third characteristic signal is a working branch of a contact net at the other end connected to a certain power supply side, and is substantially reused (suitable for the situation that a train enters from the right side or the train exits from the neutral section to the right side).
By the method, the lap joint time can be reliably obtained, the short circuit time can be judged and obtained through electrical conduction, and the judgment is more reliable and quicker than the judgment based on the geometric shape. The microsecond-level quick judgment and the given electric signal can be directly used as a starting signal for the working state conversion of power electronic and other power converter devices or used as other starting signals.
Fig. 4 is a device for obtaining accurate time of train in-out joint type electrical phase splitting according to an embodiment of the present invention, which is based on the methods in the embodiments, and includes a first signal source (signal source 1 in fig. 4), a second signal source (signal source 2 in fig. 4), and a signal acquisition and analysis device;
the first signal source and the second signal source are respectively connected with different electrically isolated parallel contact net conducting wires, the signal acquisition and analysis device is connected with the first signal source in an equipotential manner, and the signal acquisition and analysis device is connected with the contact net conducting wire connected with the second signal source;
the first signal source is used for sending a first characteristic signal, and the second signal source is used for sending a second characteristic signal;
and the signal acquisition and analysis device is used for receiving the first characteristic signal on the overhead line system lead where the first characteristic signal is located, and judging that the moment when the second characteristic signal is received is the moment when the pantograph slide plate is switched on the parallel section if the second characteristic signal is received at the same time.
Specifically, in this embodiment, the first signal source and the second signal source should be connected to two different catenary wires of the electrically isolated parallel sections (i.e., the parallel section 1 and the parallel section 2 in fig. 4), respectively; the first signal source and the second signal source are signal sources or devices with different inherent characteristics, and can be signal sources with fixed characteristics or universal signal generators capable of emitting standard signals; the signal acquisition and analysis device is a signal acquisition and analysis device or analysis software which can identify the difference of different inherent characteristic signal sources; the first signal source and the second signal source are respectively connected to two different contact net wires of the parallel section which is electrically isolated; the signal acquisition and analysis device capable of identifying the second signal source is connected to the overhead line system wire connected with the first signal source. As shown in fig. 4, the second signal source is connected to a power supply side catenary working leg at a far end in the incoming direction (for the case where the train enters from the left side or for the case where the train leaves from the neutral section and leaves to the left side to a far side), and the first signal source is connected to a neutral catenary working leg of the articulated electrical phase separation.
The signal acquisition and analysis device is always connected with the first signal source and is simultaneously connected with a certain contact line in the parallel section of the contact line system, when the signal acquisition and analysis device senses that different signals are input and recognizes that the signals have the same characteristics with a second characteristic signal sent by a second signal source agreed in advance, the moment can be instantly judged to be the moment when the pantograph slide plate conducts the two parallel sections, and the inherent characteristics (such as a specific amplitude value, a certain frequency or other characteristics) of the first signal source are known. The reason is that just because the pantograph slide plate is short-circuited with the parallel sections of the two branches at the moment, the second signal source on the far-end working branch which is originally electrically separated is transmitted to the near-end contact net working branch loop where the first signal source is located through the pantograph slide plate. This determines that the current collector is conducting the two parallel segments at the same time.
On the basis of the above embodiments, the first characteristic signal is a 50Hz frequency characteristic signal, and the second characteristic signal is a 49Hz frequency characteristic signal or a 52Hz frequency characteristic signal.
In this embodiment, the second characteristic signal is an inherent 50Hz frequency characteristic signal of a power frequency power supply in the standard of China, and the first characteristic signal should generate or be a signal different from the inherent characteristic of the signal source 1, such as an inherent 49Hz or 52Hz frequency characteristic signal (which is intentionally set to be different from the standard power frequency 50Hz), and serve as a small abnormal signal with a certain component superimposed in a large power supply system for electrified power supply, without affecting the quality of the power supply (still meeting the national standard). The software analysis system of the corresponding signal acquisition terminal connected to the neutral zone in fig. 4 should have the function of identifying such different frequencies of the signal source (similar to that of a filter or other general devices, which can be identified), and determine whether the second characteristic signal at the remote end meets the predetermined natural frequency characteristic, in this example, whether a 50Hz power (signal) is input.
On the basis of the foregoing embodiments, the signal acquisition and analysis device is configured to, if an input signal different from the first characteristic signal is received, determine whether a characteristic of the input signal is the same as a characteristic of a preset second characteristic signal, and determine that the second characteristic signal is received.
In this embodiment, a signal collecting and analyzing device that is always connected to a first signal source and is simultaneously connected to a certain contact line in a parallel section of the catenary is known to have a certain inherent characteristic (for example, a signal source with a specific amplitude, a certain frequency, or other characteristics) of the current first signal source, and when the signal collecting and analyzing device senses that different signals are input and recognizes that the signals have the same characteristics as a second characteristic signal sent by a second signal source agreed in advance, it can be determined instantaneously that the moment is the moment when the pantograph slide plate switches on the two parallel sections. The reason is that just because the pantograph slide plate is short-circuited with the parallel sections of the two branches at the moment, the second signal source on the far-end working branch which is originally electrically separated is transmitted to the near-end contact net working branch loop where the first signal source is located through the pantograph slide plate. This determines that the current collector is conducting the two parallel segments at the same time.
On the basis of the above embodiments, the first signal source is connected to a neutral contact net work branch of the anchor section articulated electrical phase separation, and the second signal source is connected to a power supply side contact net work branch far from the train entrance direction position.
On the basis of the above embodiments, the train protection system further includes a third signal source (signal source 3 in fig. 4) connected to a working branch of a power supply side overhead line system of which the train exit direction is a far end, where the third signal source is used to send a third characteristic signal; and the signal acquisition and analysis device is connected with a contact net work branch connected with a third signal source.
As shown in fig. 4, the second signal source is connected to a power supply side catenary working leg at a far end in the incoming direction (for the case where the train enters from the left side or for the case where the train leaves from the neutral section and leaves to the left side to a far side), and the first signal source is connected to a neutral catenary working leg of the articulated electrical phase separation. The third signal source is a working branch of a contact net with the other end connected to a certain power supply side, and is substantially reused by the second signal source (the third signal source is suitable for the situation that a train enters from the right side or the train exits from a neutral section to the right side direction).
For trains running in one direction (the main railway in China is usually a multi-line railway, the upper line and the lower line of the main railway are usually separately run, and a one-way running mode is normally adopted), only one far-end signal is needed, namely, a characteristic signal can be generated at the far end in the incoming direction (the far end is in a relative relation, in the above example, when the first signal source of the acquisition system and the neutral section is defined as the near end). On the basis of the embodiment, the lapping time is judged by a lapping judgment method, and lapping time information is obtained quickly and reliably.
In summary, the method and the device for obtaining the accurate time of the articulated electrical phase splitting of the train in and out provided by the embodiment of the invention adopt different differential signal source application and configuration methods to realize the function of judging the lapping time, not only can reliably obtain the lapping time, but also judge and obtain the short-circuit time through electrical conduction, and are more reliable and quicker than the judgment based on the geometric shape. The microsecond-level quick judgment and the given electric signal have the signal response time reaching the quick microsecond level and the error being in the microsecond level, and can be directly used as a starting signal for the working state conversion of power electronic and other power current transformation devices or used as other starting signals.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A train in-out joint type electric phase separation accurate time obtaining method is characterized by comprising the following steps:
respectively sending a first characteristic signal and a second characteristic signal on different contact network leads of the electrically isolated parallel sections;
when the first characteristic signal is received on the overhead line system lead where the first characteristic signal is located, if the second characteristic signal is received at the same time, the moment when the second characteristic signal is received is judged to be the moment when the pantograph slide plate is conducted with the parallel section;
if the second characteristic signal is received at the same time, the method specifically includes:
if an input signal different from the first characteristic signal is received, judging whether the characteristic of the input signal is the same as the characteristic of a preset second characteristic signal or not, and judging that the second characteristic signal is received.
2. The method for obtaining the precise time for the articulated electrical phase separation of the train in and out of claim 1, wherein the second characteristic signal is a 50Hz frequency characteristic signal, and the first characteristic signal is a 49Hz frequency characteristic signal or a 52Hz frequency characteristic signal.
3. The method for obtaining the precise time of the train entering and exiting articulated electrical phase separation according to claim 1, wherein the sending device of the first characteristic signal is connected to a neutral contact net working branch of the articulated electrical phase separation of the anchor section, and the sending device of the second characteristic signal is connected to a certain power supply side contact net working branch far away from the train entering direction.
4. The method for obtaining the precise time for the articulated electrical phase splitting of the train in and out according to claim 3, further comprising sending a third characteristic signal on a working branch of a contact network on a power supply side with a far end in the train exiting direction.
5. A train in-out joint type electric phase separation accurate time acquisition device is characterized by comprising a first signal source, a second signal source and a signal acquisition and analysis device;
the first signal source and the second signal source are respectively connected with different electrically isolated parallel contact net conducting wires, the signal acquisition and analysis device is connected with the first signal source in an equipotential manner, and the signal acquisition and analysis device is connected with the contact net conducting wire connected with the second signal source;
the first signal source is used for sending a first characteristic signal, and the second signal source is used for sending a second characteristic signal;
the signal acquisition and analysis device is used for judging that the moment when the second characteristic signal is received is the moment when the pantograph slide plate is conducted on the parallel section if the second characteristic signal is received simultaneously when the first characteristic signal is received on the overhead line system lead wire where the first characteristic signal is located;
and the signal acquisition and analysis device is used for judging whether the characteristics of the input signal are the same as the characteristics of a preset second characteristic signal or not if the input signal different from the first characteristic signal is received, and judging that the second characteristic signal is received.
6. The train in-and-out joint type electric phase separation precise time obtaining device according to claim 5, wherein the second characteristic signal is a 50Hz frequency characteristic signal, and the first characteristic signal is a 49Hz frequency characteristic signal or a 52Hz frequency characteristic signal.
7. The device for obtaining the accurate time of the articulated electrical phase separation of the train in and out according to claim 5, wherein the first signal source is connected to a neutral contact net working branch of the articulated electrical phase separation of the anchor section, and the second signal source is connected to a certain power supply side contact net working branch far away from the train entering direction.
8. The train in-out joint type electric phase separation accurate time obtaining device according to claim 7, further comprising a third signal source connected to a working branch of a power supply side overhead line system at a far end in a train out direction, wherein the third signal source is used for sending a third characteristic signal; and the signal acquisition and analysis device is connected with a contact net work branch connected with a third signal source.
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| JP2004087178A (en) * | 2002-08-23 | 2004-03-18 | Hitachi Ltd | Direct current load switch, direct current feeder circuit for electric rail way and switching method of the same |
| CN103754135A (en) * | 2014-01-20 | 2014-04-30 | 唐山轨道客车有限责任公司 | Excessive phase control method and vehicle equipment |
| CN106183897A (en) * | 2016-09-23 | 2016-12-07 | 西南交通大学 | A kind of electric railway subregion institute's automatic neutral-section passing system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004087178A (en) * | 2002-08-23 | 2004-03-18 | Hitachi Ltd | Direct current load switch, direct current feeder circuit for electric rail way and switching method of the same |
| CN103754135A (en) * | 2014-01-20 | 2014-04-30 | 唐山轨道客车有限责任公司 | Excessive phase control method and vehicle equipment |
| CN106183897A (en) * | 2016-09-23 | 2016-12-07 | 西南交通大学 | A kind of electric railway subregion institute's automatic neutral-section passing system and control method thereof |
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