CN106841807B - Method and system for measuring transition resistance between subway running rail and ground in real time - Google Patents
Method and system for measuring transition resistance between subway running rail and ground in real time Download PDFInfo
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- CN106841807B CN106841807B CN201611141622.1A CN201611141622A CN106841807B CN 106841807 B CN106841807 B CN 106841807B CN 201611141622 A CN201611141622 A CN 201611141622A CN 106841807 B CN106841807 B CN 106841807B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a method for measuring the transition resistance between a subway running rail and the ground in real time, which comprises the following steps: the first device receives a command of starting working, measures the pressure drop V0 on the steel rail with the length of q at the first position, and judges whether the pressure drop is greater than a preset value V or not; if the voltage is greater than the preset value V, sending a sampling command to the second device, measuring the pressure drop V2 on the steel rail with the length q at the second position, and sending the sampling data V2 to the first device; simultaneously, the first device measures the pressure drop V1 on the steel rail with the length of q at the first position, and reads the sampling data V2 sent by the second device; judging whether V2 is larger than a preset value V or not and whether the directions of the voltage drop V1 and V2 are the same or not; if the two are satisfied simultaneously, the first device calculates the transition resistance Rg of the steel rail and stores the transition resistance Rg. The invention also provides a system for measuring the transition resistance between the subway running rail and the ground, which has the advantages of simple structure, low cost, high reliability and convenient construction, and is widely applied to the field of detection of the transition resistance.
Description
Technical Field
The invention relates to detection of transition resistance, in particular to a method and a system for measuring the transition resistance between a subway running rail and the ground in real time.
Background
The power supply system of the subway supplies power through overhead lines, locomotives, traveling rails and backflow buses. The running rails are directly installed on the ground, and the transition resistance between the running rails and the ground directly represents the insulation condition and determines the magnitude of transition current.
The measurement of the transition resistance of the subway in the prior art adopts a ground resistance measuring instrument for measurement, the form of the measurement is off-line detection, the measurement precision is low, the workload is large, the subway locomotive needs to stop running, the measurement can be carried out only when the whole machine is powered off, the detection structure is complex, more equipment needs to be matched, the reliability is low, the input quantity of the measurement is required to be large, the cost is high due to the fact that the number of devices is large, and the engineering implementation is inconvenient, so that improvement is necessary.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method and a system for measuring the transition resistance between a subway running rail and the ground in real time.
The technical scheme adopted by the invention is as follows:
the invention provides a method for measuring the transition resistance between a subway running rail and the ground in real time, which comprises the following steps:
the first device receives a command of starting working, measures the pressure drop V0 on the steel rail with the length of q at the first position, and judges whether V0 is greater than a preset pressure drop value V;
if the pressure drop V0 is not greater than the preset value V, returning to the previous step and continuing to measure;
if the pressure drop V0 is greater than a preset value V, sending a sampling command to a second device;
after receiving the sampling command, the second device measures the pressure drop V2 on the steel rail with the length of q at the second position, and sends the sampling data V2 to the first device;
simultaneously, the first device measures the pressure drop V1 on the steel rail with the length of q at the first position again, and reads the sampling data V2 sent by the second device within the preset time;
the first device judges whether the sampling data V2 sent by the second device is larger than a preset value V or not and whether the directions of the voltage drop V1 and the voltage drop V2 are the same or not;
if the two can not be satisfied at the same time, returning to the first step for re-measurement;
if the two are satisfied simultaneously, the first device calculates the transition resistance Rg of the steel rail and stores the transition resistance Rg.
Further, the preset voltage drop value V is influenced by the resistivity of the steel rail, the length of the steel rail and the current of the steel rail.
Further, the formula of the first device for calculating the transition resistance Rg of the steel rail is as follows
Further, the preset time is 1 s.
Further, the first device and the second device are located at different positions for operation.
Further, when the length q of the steel rail is 10m, the preset pressure drop value V is 30 mv.
On the other hand, the invention also provides a system for measuring the transition resistance between the subway running rail and the ground in real time, which comprises
The first module is used for executing the command that the first device receives the start of work, measuring the pressure drop V0 on the steel rail with the length q at the first position, and judging whether the V1 is greater than a preset pressure drop value V or not;
a second module, configured to perform, if the pressure drop V0 is not greater than the preset value V, returning to the previous step and continuing to measure; if the pressure drop V0 is greater than a preset value V, sending a sampling command to a second device;
the third module is used for measuring the pressure drop V2 on the steel rail with the length of q at the second position after the second device receives the sampling command, and sending the sampling data V2 to the first device; simultaneously, the first device measures the pressure drop V1 on the steel rail with the length of q at the first position again, and reads the sampling data V2 sent by the second device within the preset time;
the fourth module is used for executing the judgment of whether the sampling data V2 sent by the second device is larger than the preset value V or not and whether the directions of the voltage drop V1 and the voltage drop V2 are the same or not by the first device;
a fifth module, configured to perform the first re-measurement step if the two cannot be satisfied simultaneously; if the two are satisfied simultaneously, the first device calculates the transition resistance Rg of the steel rail and stores the transition resistance Rg.
The invention has the beneficial effects that: the invention provides a method and a system for measuring transition resistance between a subway running rail and the ground in real time. Judging whether a locomotive runs on the track by using the measured voltage, and judging whether the locomotive runs outside the area by using the voltage synchronously measured by the two devices; when the locomotive runs outside the area, calculating a transition resistance value by using the two measured voltage values through a system equivalent node method; compared with the existing system, the scheme has the advantages of simple structure, low cost, high reliability and convenient construction.
Drawings
The following further describes embodiments of the present invention with reference to the accompanying drawings:
FIG. 1 is a schematic view of a first embodiment of the present invention;
FIG. 2 is an equivalent schematic diagram of a first embodiment of the present invention;
fig. 3 is a flow chart of a method of a second embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Referring to fig. 1-2, a schematic diagram of an embodiment of the present invention is shown. When the locomotive does not reach the test steel rail, the measured voltage and current are different from those when the locomotive reaches the test steel rail, and the measured voltage is larger when the locomotive reaches the test steel rail. The measuring system is cooperatively measured by two devices which are arranged at different positions (can differ by 100 meters and the like), a device A control device B synchronously measures the voltage drop on a steel rail with the same distance, such as 10 meters, at the appropriate time with the device A, the measured value is sent to the device A, and the device A combines the data sent by the device B to calculate the transition resistance. Two cooperative measurement devices adopt CAN communication, one master and one slave, and synchronous measurement is carried out; the direction of the current measured by the two devices is used to determine whether the train is between the two measuring devices or outside the area.
The total stray current I3 can be measured to be I1-I2 according to the fact that the locomotive is outside the measuring area and the currents I1 and I2 can be measured simultaneously; meanwhile, knowing the resistivity of the steel rail, the transition resistance Rg ═ (I2/I3) × R can be obtained through conversion; i1, I2 the currents I1, I2 can be deduced from the resistivity of the rail by measuring the voltage drop over a length of 10m on the running rail.
The invention provides a method for measuring the transition resistance between a subway running rail and the ground in real time, which comprises the following steps:
the first device receives a command of starting working, measures the pressure drop V0 on the steel rail with the length of q at the first position, and judges whether V0 is greater than a preset pressure drop value V;
if the pressure drop V0 is not greater than the preset value V, returning to the previous step and continuing to measure;
if the pressure drop V0 is greater than a preset value V, sending a sampling command to a second device;
after receiving the sampling command, the second device measures the pressure drop V2 on the steel rail with the length of q at the second position, and sends the sampling data V2 to the first device;
simultaneously, the first device measures the pressure drop V1 on the steel rail with the length of q at the first position again, and reads the sampling data V2 sent by the second device within the preset time;
the first device judges whether the sampling data V2 sent by the second device is larger than a preset value V or not and whether the directions of the voltage drop V1 and the voltage drop V2 are the same or not;
if the two can not be satisfied at the same time, returning to the first step for re-measurement;
if the two are satisfied simultaneously, the first device calculates the transition resistance Rg of the steel rail and stores the transition resistance Rg.
Further, the preset voltage drop value V is influenced by the resistivity of the steel rail, the length of the steel rail and the current of the steel rail.
Further, the formula of the first device for calculating the transition resistance Rg of the steel rail is as follows
Further, the preset time is 1 s.
Further, the first device and the second device are located at different positions for operation.
Further, when the length q of the steel rail is 10m, the preset pressure drop value V is 30 mv.
On the other hand, the invention also provides a system for measuring the transition resistance between the subway running rail and the ground in real time, which comprises
The first module is used for executing the command that the first device receives the start of work, measuring the pressure drop V0 on the steel rail with the length q at the first position, and judging whether the V1 is greater than a preset pressure drop value V or not;
a second module, configured to perform, if the pressure drop V0 is not greater than the preset value V, returning to the previous step and continuing to measure; if the pressure drop V0 is greater than a preset value V, sending a sampling command to a second device;
the third module is used for measuring the pressure drop V2 on the steel rail with the length of q at the second position after the second device receives the sampling command, and sending the sampling data V2 to the first device; simultaneously, the first device measures the pressure drop V1 on the steel rail with the length of q at the first position again, and reads the sampling data V2 sent by the second device within the preset time;
the fourth module is used for executing the judgment of whether the sampling data V2 sent by the second device is larger than the preset value V or not and whether the directions of the voltage drop V1 and the voltage drop V2 are the same or not by the first device;
a fifth module, configured to perform the first re-measurement step if the two cannot be satisfied simultaneously; if the two are satisfied simultaneously, the first device calculates the transition resistance Rg of the steel rail and stores the transition resistance Rg.
Referring to fig. 3, a flow chart of a method according to a second embodiment of the present invention is shown.
The first device receives the starting signal and then starts to work;
measuring the voltage drop on a section of steel rail, such as the voltage drop V on a 10-meter steel rail;
if the pressure drop V is not more than 30mV, returning to the previous step;
if the voltage drop V is more than 30mV, sending a collecting command to a second device for sampling, receiving the sampling command by the second device, measuring the voltage drop V2 on the steel rail with the length of 10 meters, measuring the voltage drop V1 on the steel rail with the length of 10 meters by the first device again, measuring the voltage drop V2 on the steel rail with the length of 10 meters by the second device, sending data V2 to the first device, judging whether the data sent by the second device is overtime or not by the first device, and if the data sent by the second device is overtime, re-measuring the data; if not, the first device reads the sampling data V2 sent by the second device and judges whether V2 is more than 30mV and whether the directions of V1 and V2 are the same;
if V2 is greater than 30mV and V1 is in the same direction as V2, then the transition resistance Rg is calculated and stored.
The invention breaks through the traditional measuring mode (off-line mode) in the subway transition resistance measuring system, and indirectly measures the transition resistance between the subway running rail and the ground in real time by directly using the working current in the running rail of the subway locomotive as the driving current as the measuring driving source. Judging whether a locomotive runs on the track by using the measured voltage, and judging whether the locomotive runs outside the area by using the voltage synchronously measured by the two devices; when the locomotive runs outside the area, calculating a transition resistance value by using the two measured voltage values through a system equivalent node method; compared with the existing system, the scheme has the advantages of simple structure, low cost, high reliability and convenient construction.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A method for measuring transition resistance between a subway running rail and the ground in real time is characterized by comprising the following steps:
the first device receives a command of starting working, measures the pressure drop V0 on the steel rail with the length of q at the first position, and judges whether V0 is greater than a preset pressure drop value V;
if the pressure drop V0 is not greater than the preset pressure drop value V, returning to the previous step and continuing to measure;
if the pressure drop V0 is greater than a preset pressure drop value V, sending a sampling command to a second device;
after receiving the sampling command, the second device measures a pressure drop V2 on the steel rail with the length of q at the second position, and sends the pressure drop V2 to the first device;
simultaneously, the first device measures the pressure drop V1 on the steel rail with the length of q at the first position again, and reads the pressure drop V2 sent by the second device within a preset time;
the first device judges whether the voltage drop V2 sent by the second device is larger than a preset voltage drop value V or not and whether the directions of the voltage drops V1 and V2 are the same or not;
if the two can not be satisfied at the same time, returning to the first step for re-measurement;
if the two are met simultaneously, the first device calculates and stores the transition resistance Rg of the steel rail;
the preset voltage drop value V is influenced by the resistivity of the steel rail, the length of the steel rail and the current of the steel rail;
the formula of the first device for calculating the transition resistance Rg of the steel rail isR is the resistance of the steel rail.
2. The method for measuring the transition resistance between the subway running rail and the ground in real time according to claim 1, wherein the method comprises the following steps: the preset time is 1 s.
3. The method for measuring the transition resistance between the subway running rail and the ground in real time according to claim 2, wherein the method comprises the following steps: the first device and the second device are located at different positions for working.
4. The method for measuring the transition resistance between the subway running rail and the ground in real time according to claim 3, wherein the method comprises the following steps: when the length q of the steel rail is 10m, the preset pressure drop value V is 30 mv.
5. A system for measuring the transition resistance between a subway running rail and the ground in real time is characterized by comprising
The first module is used for executing the command that the first device receives the start of work, measuring the pressure drop V0 on the steel rail with the length q at the first position, and judging whether the V1 is greater than a preset pressure drop value V or not;
the second module is used for returning to the previous step and continuing to measure if the pressure drop V0 is not greater than a preset pressure drop value V; if the pressure drop V0 is greater than a preset pressure drop value V, sending a sampling command to a second device;
the third module is used for measuring the pressure drop V2 on the steel rail with the length q at the second position after the second device receives the sampling command, and sending the pressure drop V2 to the first device; simultaneously, the first device measures the pressure drop V1 on the steel rail with the length of q at the first position again, and reads the pressure drop V2 sent by the second device within a preset time;
the fourth module is used for executing the judgment of whether the voltage drop V2 sent by the second device is larger than the preset voltage drop value V or not and whether the directions of the voltage drops V1 and V2 are the same or not by the first device;
a fifth module, configured to perform the first re-measurement step if the two cannot be satisfied simultaneously; if the two are met simultaneously, the first device calculates and stores the transition resistance Rg of the steel rail;
the preset voltage drop value V is influenced by the resistivity of the steel rail, the length of the steel rail and the current of the steel rail;
the formula of the first device for calculating the transition resistance Rg of the steel rail isR is the resistance of the steel rail.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611141622.1A CN106841807B (en) | 2016-12-12 | 2016-12-12 | Method and system for measuring transition resistance between subway running rail and ground in real time |
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| CN201611141622.1A CN106841807B (en) | 2016-12-12 | 2016-12-12 | Method and system for measuring transition resistance between subway running rail and ground in real time |
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| CN106841807B true CN106841807B (en) | 2019-12-24 |
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| CN110217136B (en) * | 2019-05-29 | 2020-09-11 | 北京城建信捷轨道交通工程咨询有限公司 | Method for protecting subway stray current and monitoring device |
| CN114966216B (en) * | 2022-08-01 | 2022-11-29 | 中铁电气化勘测设计研究院有限公司 | Steel rail longitudinal resistance and transition resistance measuring system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2475638Y (en) * | 2001-04-10 | 2002-02-06 | 中国矿业大学 | A metro transition resistance on-line monitoring device |
| CN102175597A (en) * | 2011-01-21 | 2011-09-07 | 中国矿业大学 | On-line monitoring method of metro stray current corrosion on-line monitoring system |
| CN106199201A (en) * | 2016-09-20 | 2016-12-07 | 中铁第勘察设计院集团有限公司 | Urban track traffic rail ground transition resistance test system and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2475638Y (en) * | 2001-04-10 | 2002-02-06 | 中国矿业大学 | A metro transition resistance on-line monitoring device |
| CN102175597A (en) * | 2011-01-21 | 2011-09-07 | 中国矿业大学 | On-line monitoring method of metro stray current corrosion on-line monitoring system |
| CN106199201A (en) * | 2016-09-20 | 2016-12-07 | 中铁第勘察设计院集团有限公司 | Urban track traffic rail ground transition resistance test system and method |
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