CN108169569B - Rail-to-drain network transition resistance monitoring system and control method thereof - Google Patents
Rail-to-drain network transition resistance monitoring system and control method thereof Download PDFInfo
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention discloses a rail-to-drain network transition resistance monitoring system and a control method thereof, wherein the monitoring system is as follows: the intelligent control module is connected with the microcomputer management system through an Ethernet interface, receives the instruction of the microcomputer management system, and uploads error information and monitoring results to the microcomputer management system; the intelligent control module is connected with the steel rail potential limiting device through a communication cable and receives the running state information of the steel rail potential limiting device; the intelligent control module is connected with a drainage branch switch in the drainage cabinet through a communication cable, and controls the drainage branch to be kept off during monitoring; the intelligent control module is connected with the power supply module through a communication cable, receives current data and controls the on-off of the power supply module; the intelligent control module is connected with the high-precision measuring module through a communication cable, receives voltage data, calculates, displays, uploads and stores the transition resistance of the steel rail to the drainage network according to current and voltage. The invention has accurate monitoring, simple operation, high reliability and easy maintenance.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a rail-to-drain network transition resistance monitoring system and a control method thereof.
Background
The urban rail transit is usually powered by a DC power supply system which is not grounded in a floating way, and the steel rail is used as a reflux path of train current. Because the rail itself has longitudinal resistance, and the rail is installed on the ground through the fastener, a certain transition resistance exists to the ground, when current flows, the rail generates voltage to the ground, namely rail potential. The excessive rail potential threatens personnel safety, and due to the existence of transition resistance of the rail to the drainage network, part of current flowing through the rail leaks into the ground to become stray current. Stray currents have an electrolytic form of corrosion effect on the metal structure surrounding the rail and, in severe cases, can have disastrous consequences.
The transition resistance of the rail pair drainage network of the line is checked regularly, and protective measures are taken when the transition resistance is too low, so that the method is an effective scheme for limiting the potential and the stray current of the rail. At present, the transition resistance of the steel rail to the drainage network is detected by sampling by a manual method, and the following defects exist: sampling presence randomness; the manual wiring and reading have larger errors; the manpower consumption is big, and the detection cycle is long.
Disclosure of Invention
The invention aims to solve the technical problem of providing a rail-to-drainage network transition resistance monitoring system and a control method thereof, which realize automatic monitoring of rail-to-drainage network transition resistance, and have the characteristics of accurate monitoring, simple operation, high reliability, easy maintenance, integration into the existing stray current monitoring system and drainage cabinet and the like, and ensure the safe operation of a subway system.
In order to solve the technical problems, the invention adopts the following technical scheme:
a rail-to-drain network transition resistance monitoring system comprises an intelligent control module, a power supply module and a high-precision measurement module;
the intelligent control module is connected with the microcomputer management system through an Ethernet interface, receives the instruction of the microcomputer management system, and uploads error information and monitoring results to the microcomputer management system; the intelligent control module is connected with a steel rail potential limiting device (OVPD) through a communication cable and receives the running state information of the steel rail potential limiting device; the intelligent control module is connected with a drainage branch switch in the drainage cabinet through a communication cable, and controls the drainage branch to be kept off during monitoring; the intelligent control module is connected with the power supply module through a communication cable, receives current data and controls the on-off of the power supply module; the intelligent control module is connected with the high-precision measurement module through a communication cable and receives voltage data; the intelligent control module calculates, displays, uploads and stores the transition resistance of the steel rail to the drainage network according to the current and the voltage;
forming a monitoring section by using the track section with the traction as the midpoint, wherein the length of the monitoring section is between 1km and 4km; the middle position and the left end and the right end of the monitoring section are respectively provided with a high-precision measuring module; the high-precision measuring module is arranged beside the steel rail and is provided with 6 paths of measuring channels, the channels 1-2 are used for measuring the pressure drop of the steel rail to the drainage network, and the channels 3-6 are used for measuring the longitudinal 10m pressure drop of the steel rail; the high-precision measurement module uploads voltage data to the intelligent control module through the communication cable.
Further, the power supply module is integrated in the drainage cabinet, the positive electrode of the power supply module is connected with the direct current negative busbar of the traction station, and the negative electrode of the power supply module is connected with the drainage network terminal in the drainage cabinet; the power supply module has a constant current function, and is integrated with a high-precision closed-loop Hall current sensor for monitoring output current.
A control method of a rail-to-drain network transition resistance monitoring system comprises the following steps:
step 1: the intelligent control module performs address coding on each high-precision measurement module in the monitoring section in advance, records channel and position information of the high-precision measurement module and the length of the monitoring section, and establishes a database to store various information and monitoring data; the monitoring instruction is issued to the intelligent control module through the microcomputer management system or issued through a monitoring switch on the intelligent control module; monitoring is carried out after the train is stopped;
step 2: after receiving the monitoring instruction, the intelligent control module firstly receives the running state of the steel rail potential limiting device in the monitoring section, if the steel rail potential limiting device is closed, the intelligent control module stops monitoring, relevant information is displayed on a screen, and the relevant information is uploaded to the microcomputer management system; if no rail potential limiting device is closed, the intelligent control module uploads a' monitoring signal to the microcomputer management system, and after the microcomputer management system receives the signal, the intelligent control modules of other track sections are locked and do not respond to the monitoring instruction;
step 3: before the power supply module is controlled to output current, the power supply module measures current noise, the high-precision measuring module measures voltage noise, and the voltage noise is uploaded to the intelligent control module; the intelligent control module judges whether the monitoring section has faults or electric interference according to the variation amplitude of the current noise and the voltage noise, if so, the intelligent control module stops monitoring, and displays and uploads relevant information;
step 4: if no fault and no electrical interference exist, after the noise measurement is finished, the intelligent control module controls the power supply module to output constant current between the steel rail and the drainage network, the power supply module measures the current, the high-precision measurement module measures the voltage, and the voltage is uploaded to the intelligent control module; the intelligent control module calculates the transition resistance of the steel rail to the drainage network by using real-time current and voltage, and displays, saves and uploads the current, the voltage and the real-time calculation result;
the intelligent control module calculates the transition resistance of the steel rail to the drainage network by using real-time current and voltage, and the concrete calculation method comprises the following steps:
resistance R of single steel rail 10m in longitudinal direction l_10m Unit mΩ
In the formula, U k To monitor the 10m pressure drop in the longitudinal direction of the rail in the middle of the section, U koff For the corresponding 10m pressure drop noise in the longitudinal direction of the steel rail, k=1 to 4 represents 4 paths of the high-precision measuring module of one row for measuring the 10m pressure drop of the steel rail, k=5 to 8 represents 4 paths of the high-precision measuring module of the other row for measuring the 10m pressure drop of the steel rail, I is the total current injected into the monitoring section by the power supply module, and is measured by the power supply module;
monitoring section steel rail to drainage network transition resistance R g Unit Ω
In the formula, U Pi To monitor the pressure drop of the rail in the middle of the section to the drainage network, U Pioff The noise is reduced for the corresponding rail-to-drain network; u (U) APi To monitor the pressure drop of the rail at one end of the section to the drainage network, U APioff The noise is reduced for the corresponding rail-to-drain network; u (U) BPi To monitor the pressure drop of the steel rail at the other end of the section to the drainage network, U BPioff The noise is reduced for the corresponding rail-to-drain network; i=1 to 2 represents 2 paths of the high-precision measuring module of one row for measuring the pressure drop of the steel rail to the drainage network, and i=3 to 4 represents 2 paths of the high-precision measuring module of the other row for measuring the pressure drop of the steel rail to the drainage network;U Aj to monitor the 10m pressure drop in the longitudinal direction of the rail at one end of the section, U Ajoff The noise is the longitudinal 10m pressure drop of the corresponding steel rail; u (U) Bj To monitor the longitudinal 10m pressure drop of the rail at the other end of the section, U Bjoff The noise is the longitudinal 10m pressure drop of the corresponding steel rail; j=1 to 2 represents 2 paths of the high-precision measuring module of one row for measuring the 10m pressure drop of the steel rail in the longitudinal direction, and j=3 to 4 represents 2 paths of the high-precision measuring module of the other row for measuring the 10m pressure drop of the steel rail in the longitudinal direction;
1km rail-to-drain network transition resistor R g_1km Units of omega/km
R g_1km ＝R g ×L
In the formula, L is the length of the monitoring section, and is measured in advance and stored in the intelligent control module;
step 5: after the measurement of the current and the voltage is finished, the intelligent control module controls the power supply module to be turned off, and the monitoring end signal is uploaded to the microcomputer management system, and after the microcomputer management system receives the signal, the other intelligent control modules are unlocked.
Compared with the prior art, the invention has the beneficial effects that: the power supply module is integrated in the existing drainage cabinet, a cabinet body is not added, the number of newly added wires is small, and the space and the cost are saved; the high-precision measuring module measures current and voltage data on site, and the data are uploaded to the intelligent control module through the communication cable, so that the accuracy of the current and voltage data is ensured; by receiving the on-off signal, the OVPD in the monitoring section is ensured to be in an off state, and by measuring current noise and voltage noise, the monitoring section is ensured to have no faults and electrical interference, and the reliability of a monitoring result is ensured; the microcomputer management system is connected with each intelligent control module through the Ethernet, so that the sectional, full-coverage and remote monitoring of the transition resistance of the full-line steel rail to the drainage network are realized.
Drawings
Fig. 1 is a topological structure diagram of the present invention.
Fig. 2 is a communication schematic of the present invention.
Fig. 3 is a schematic diagram of the power module installation of the present invention.
FIG. 4 is a schematic diagram of the high-precision measurement module according to the present invention.
Fig. 5 is a schematic diagram of the monitoring data of the present invention.
Fig. 6 is a control flow diagram of the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1, a rail-to-drain network transition resistance monitoring system comprises an intelligent control module, a high-precision measurement module and a power supply module; the intelligent control module is connected with the microcomputer management system through an Ethernet interface; the intelligent control module is connected with the power supply module and a drainage branch of the drainage cabinet through communication cables to control the on-off of the power supply module and the drainage branch; the intelligent control module is connected with the high-precision measurement module and the OVPD through communication cables; the intelligent control module performs address coding on the high-precision measurement module and the OVPD in advance, records the installation position and the length information of the monitoring section, records the length of the monitoring section, and establishes a database to store and manage various information and monitoring data.
As shown in fig. 2, the track section with the midpoint of the traction constitutes a monitoring section, and the length of the monitoring section is not less than 1km and not more than 4km; the power supply module is arranged in the drainage cabinet, provides constant current for the monitoring section, is integrated with a high-precision closed-loop Hall current sensor, measures the output current of the power supply module and uploads the output current to the intelligent control module; the high-precision measuring module is arranged beside the upper and lower steel rails at the middle part and two ends of the monitoring section and is used for measuring the voltage data of the upper and lower steel rails; the power supply module, the high-precision measurement module and the OVPD in the monitoring section are all connected to the intelligent control module through communication cables and are in data communication with the intelligent control module; the intelligent control module is connected with the microcomputer management system through the Ethernet, receives instructions issued by the microcomputer management system, or uploads error information and monitoring results to the microcomputer management system.
The monitoring instruction can be issued to the intelligent control module by the microcomputer management system or issued by a monitoring switch on the intelligent control module; after receiving the monitoring instruction, the intelligent control module sends 'monitoring information' to the microcomputer management system; after receiving the information, the microcomputer management system can lock other intelligent control modules and does not respond to the monitoring instruction; the monitoring can be finished through a monitoring switch on a microcomputer management system or an intelligent control module, or the monitoring time can be preset, and the monitoring can be automatically started and finished.
After receiving the monitoring instruction, the intelligent control module receives state information sent by the traction station and the OVPDs of each station in the monitoring section through the communication cable, and if the monitoring section is closed, the intelligent control module does not perform any monitoring operation, displays error information on a screen and sends the error information to the microcomputer management system; during monitoring, the intelligent control module controls the drainage branch to keep the off state until the monitoring is finished.
As shown in fig. 3, the power supply module is integrated in the traction station drainage cabinet, the positive electrode of the power supply module is connected with the traction station direct current negative busbar, and the negative electrode of the power supply module is connected with the drainage network terminal in the drainage cabinet; the power supply module has a constant current function and can provide constant current for the monitoring section; the positive electrode lead-out wire of the power supply module is provided with a high-precision closed-loop Hall current sensor which is used for monitoring the total current injected by the power supply module; the switching signal of the power supply module is K 1 The switch signal of the drainage branch is K 2 0 represents off, 1 represents on; k (K) 1 、K 2 Is connected to the intelligent control module through a communication cable.
As shown in fig. 4, the high-precision measuring module is arranged beside the steel rail and is provided with 6 paths of measuring channels; the error of the channels 1-2 is not more than 0.1V, and the channels are used for monitoring the pressure drop of the upward and downward steel rails to the drainage network; the error of the channels 3-6 is not more than 0.1mV, and the channels are used for monitoring the longitudinal 10m pressure drop of the up-and-down steel rail; the high-precision measuring module is arranged near the traction station, and the channels 3-4 and the channels 5-6 are respectively arranged at two sides of the return line; the high-precision measuring modules arranged at the two ends of the monitoring section are not connected with the channels 3-4 or the channels 5-6.
As shown in FIG. 5, the 10m longitudinal pressure drop U of the rail at one end of the monitoring section was measured A1 ～U A4 (mV), and rail to drain network pressure drop U PA1 ～U PA4 (V); measuring 10m longitudinal pressure drop U of steel rail at the other end of monitoring section B1 ～U B4 (mV), and rail pair rowPressure drop U of flow net PB1 ～U PB4 (V); measuring 10m longitudinal pressure drop U of steel rail in middle part of monitoring section 1 ～U 8 (mV) rail to drain pressure drop U P1 ～U P4 (V); measuring the total current I injected into the monitoring section by the power supply module; the length of the monitoring section is L (km).
As shown in fig. 6, after receiving the monitoring command, if the monitoring section OVPD and the drainage branch are in the off state, the intelligent control module firstly measures the 10m longitudinal pressure drop noise U of the rail at one end of the monitoring section under the condition of no power on A1off ～U A4off (mV), and rail-to-drain network drop noise U PA1off ～U PA4off (V) monitoring the noise U of 10m pressure drop in the longitudinal direction of the rail at the other end of the section B1off ～U B4off (mV), and rail-to-drain network drop noise U PB1off ～U PB4off (V) monitoring the longitudinal 10m pressure drop noise U of the rail in the middle of the section 1off ～U 8off Rail-to-drain network voltage drop noise U P1off ～U P4off (V) and Current noise I off And stored in a database. In the measuring process, the intelligent control module judges whether the monitoring section has faults or electric interference according to the magnitude of the noise fluctuation amplitude (the difference between the maximum value and the minimum value); if the following conditions are satisfied: the fluctuation amplitude of the current noise is larger than 0.2A, the fluctuation amplitude of the voltage drop noise of one or more steel rails in the longitudinal direction of 10m is larger than 0.1mV, the fluctuation amplitude of the voltage drop noise of one or more steel rails on the drainage network is larger than 0.1V, the fault or the electric interference of the monitoring section is indicated, and at the moment, the intelligent control module displays error information on a screen and sends the error information to the microcomputer management system, and meanwhile, the monitoring operation is stopped; the measuring time of the noise can be set according to the actual condition of the site; if the monitoring section is free from electrical interference, after the noise measurement and recording are completed, the intelligent control module calculates the average value of each noise in the whole measurement time respectively to serve as the noise of each monitoring amount.
After successfully acquiring noise, the intelligent control module controls the power supply module to inject constant direct current into the monitoring section, after waiting for a certain time and the current is stable, the high-precision measurement module measures monitoring data, the intelligent control module receives the monitoring data and calculates the transition resistance of the steel rail to the drainage network in real time, and the calculation method comprises the following steps:
10m longitudinal resistance of single steel rail
Monitoring section steel rail to drainage network transition resistance
1km rail-to-drain network transition resistor
R g_1km ＝R g ×L(Ω/km)。
The intelligent control module stores the monitoring data and the real-time calculation result in a database, displays the monitoring data and the real-time calculation result on a screen and uploads the monitoring data and the real-time calculation result to the microcomputer management system; after the monitoring is finished, the intelligent control module controls the power supply module to be turned off, the real-time monitoring result of the transition resistance of the steel rail to the drainage network is averaged, the averaged value is saved, displayed and uploaded as a final monitoring result, meanwhile, the monitoring finishing information is uploaded to the microcomputer management system, and the microcomputer management system enables other intelligent control modules to be unlocked.
Claims (1)
1. A control method of a rail-to-drain network transition resistance monitoring system comprises an intelligent control module, a power supply module and a high-precision measurement module; the intelligent control module is connected with the microcomputer management system through an Ethernet interface, receives the instruction of the microcomputer management system, and uploads error information and monitoring results to the microcomputer management system; the intelligent control module is connected with the steel rail potential limiting device through a communication cable and receives the running state information of the steel rail potential limiting device; the intelligent control module is connected with a drainage branch switch in the drainage cabinet through a communication cable, and controls the drainage branch to be kept off during monitoring; the intelligent control module is connected with the power supply module through a communication cable, receives current data and controls the on-off of the power supply module; the intelligent control module is connected with the high-precision measurement module through a communication cable and receives voltage data; the intelligent control module calculates, displays, uploads and stores the transition resistance of the steel rail to the drainage network according to the current and the voltage; forming a monitoring section by using the track section with the traction as the midpoint, wherein the length of the monitoring section is between 1km and 4km; the middle position and the left end and the right end of the monitoring section are respectively provided with a high-precision measuring module; the high-precision measuring module is arranged beside the steel rail and is provided with 6 paths of measuring channels, the channels 1-2 are used for measuring the pressure drop of the steel rail to the drainage network, and the channels 3-6 are used for measuring the longitudinal 10m pressure drop of the steel rail; the high-precision measurement module uploads voltage data to the intelligent control module through the communication cable; the power supply module is integrated in the drainage cabinet, the positive electrode of the power supply module is connected with the direct current negative busbar of the traction station, and the negative electrode of the power supply module is connected with the drainage network terminal in the drainage cabinet; the power supply module has a constant current function, and is integrated with a high-precision closed-loop Hall current sensor for monitoring output current; the method is characterized by comprising the following steps of:
step 1: the intelligent control module performs address coding on each high-precision measurement module in the monitoring section in advance, records channel and position information of the high-precision measurement module and the length of the monitoring section, and establishes a database to store various information and monitoring data; the monitoring instruction is issued to the intelligent control module through the microcomputer management system or issued through a monitoring switch on the intelligent control module; monitoring is carried out after the train is stopped;
step 2: after receiving the monitoring instruction, the intelligent control module firstly receives the running state of the steel rail potential limiting device in the monitoring section, if the steel rail potential limiting device is closed, the intelligent control module stops monitoring, relevant information is displayed on a screen, and the relevant information is uploaded to the microcomputer management system; if no rail potential limiting device is closed, the intelligent control module uploads a' monitoring signal to the microcomputer management system, and after the microcomputer management system receives the signal, the intelligent control modules of other track sections are locked and do not respond to the monitoring instruction;
step 3: before the power supply module is controlled to output current, the power supply module measures current noise, the high-precision measuring module measures voltage noise, and the voltage noise is uploaded to the intelligent control module; the intelligent control module judges whether the monitoring section has faults or electric interference according to the variation amplitude of the current noise and the voltage noise, if so, the intelligent control module stops monitoring, and displays and uploads relevant information;
step 4: if no fault and no electrical interference exist, after the noise measurement is finished, the intelligent control module controls the power supply module to output constant current between the steel rail and the drainage network, the power supply module measures the current, the high-precision measurement module measures the voltage, and the voltage is uploaded to the intelligent control module; the intelligent control module calculates the transition resistance of the steel rail to the drainage network by using real-time current and voltage, and displays, saves and uploads the current, the voltage and the real-time calculation result;
step 5: after the monitoring is finished, the intelligent control module controls the power supply module to be turned off, and the monitoring finishing signal is uploaded to the microcomputer management system, and after the microcomputer management system receives the signal, the other intelligent control modules are unlocked.
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| CN114325472A (en) * | 2021-12-23 | 2022-04-12 | 徐州和纬信电科技有限公司 | Stray current monitoring system based on dynamic and static automatic switching measurement function |
| 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 |
| CN115840086B (en) * | 2023-02-16 | 2023-07-04 | 中铁电气化勘测设计研究院有限公司 | Urban rail transit steel rail insulation performance monitoring system |
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| CN206114776U (en) * | 2016-09-20 | 2017-04-19 | 中铁第一勘察设计院集团有限公司 | Urban rail transit rail ground transition resistance test system |
| CN106199201B (en) * | 2016-09-20 | 2023-06-27 | 中铁第一勘察设计院集团有限公司 | Urban rail transit rail-ground transition resistance test system and method thereof |
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