CN109387680B - Urban rail traction power supply system and urban electric power main transformer direct-current magnetic bias synchronous monitoring system - Google Patents
Urban rail traction power supply system and urban electric power main transformer direct-current magnetic bias synchronous monitoring system Download PDFInfo
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Abstract
The invention discloses an urban rail traction power supply system and an urban electric power main transformer direct current magnetic bias synchronous monitoring system, which monitors the problem of urban electric power main transformer direct current magnetic bias caused by urban rail stray current, and the system comprises: the whole synchronous monitoring system is divided into three subsystems, namely an urban rail drainage network current monitoring subsystem, an electric main transformer neutral point current monitoring subsystem and a comprehensive analysis subsystem; the hardware of the urban rail drainage network current monitoring subsystem is composed of a Hall sensor, a signal conditioning board, a data acquisition card, a GPRS wireless transmission module and an industrial personal computer in sequence; the hardware of the electric power main transformer neutral point current monitoring subsystem is composed of a Hall current sensor, a signal conditioning board, a data acquisition card and an industrial personal computer in sequence.
Description
Technical Field
The invention relates to the field of on-line monitoring of equipment, in particular to a synchronous monitoring system for an urban rail traction power supply system and an urban electric power main transformer direct-current magnetic bias.
Background
In recent years, urban rail transit has been developed rapidly in China, and in 2016, a total of 133 urban rail transit lines are opened in 30 cities in the continental region of China, and the total length of the operation lines reaches 4152.8 km. The urban rail traction power supply system generally adopts a direct current power supply mode, and a subway train draws current from a contact net (or a third rail) and realizes reflux through a steel rail. However, as the subway steel rail is difficult to be completely insulated from the ground, a part of current leaks into the ground to form underground stray current, and the ground potential distortion is caused along with the characteristics of large-scale and high-density running of urban rail trains and networking, superposition and increase of the underground stray current, so that the influence on the main transformer of urban electric power is generated and the influence is shown by the direct-current magnetic biasing phenomenon.
In the past cognition, the direct current magnetic biasing phenomenon of a transformer is mainly caused by a high-voltage direct current transmission system or a geomagnetic induction current, the direct current magnetic biasing phenomenon of a main power transformer caused by urban rail stray current is discovered and valued in recent years, and a monitoring device is not available for monitoring the phenomenon, so that an urban rail traction power supply system and an urban main power transformer direct current magnetic biasing synchronous monitoring system are needed, and the direct current magnetic biasing phenomenon of the main power transformer caused by the urban rail stray current is monitored and analyzed.
Disclosure of Invention
The invention aims to provide a synchronous monitoring system for direct current magnetic biasing of an urban rail traction power supply system and an urban electric power main transformer, which has the advantages of low implementation cost, accurate and reliable information acquisition, realization of wireless data transmission of a system part, convenience for arrangement and recovery of the monitoring system and no influence on normal operation of an urban power grid and urban rail transit.
The whole synchronous monitoring system is divided into three subsystems, namely an urban rail drainage network current monitoring subsystem, an electric main transformer neutral point current monitoring subsystem and a comprehensive analysis subsystem; the hardware of the urban rail drainage network current monitoring subsystem is composed of a Hall sensor, a signal conditioning board, a data acquisition card, a GPRS wireless transmission module and an industrial personal computer in sequence; the hardware of the power main transformer neutral point current monitoring subsystem is composed of a Hall current sensor, a signal conditioning board, a data acquisition card and an industrial personal computer in sequence; the hardware of the synchronous comprehensive analysis subsystem is composed of a background server. The industrial personal computers in the electric power main transformer neutral point current monitoring subsystem and the urban rail drainage network current monitoring subsystem are provided with GPS time service modules, and the GPS system is utilized to provide a unified clock signal for the whole system to acquire each path of signal.
The technical scheme adopted by the invention for realizing the second purpose is that the functions of an urban rail traction power supply system and an urban electric main transformer direct-current magnetic bias synchronous monitoring system are applied as follows.
1) The method comprises the following steps of (1) urban rail drainage network current signal acquisition and processing: an open-close type Hall current sensor is additionally arranged at a connecting cable of a drainage network in an urban rail transit line. The open-close type Hall sensor is installed without power failure operation, and normal operation of urban rail transit is not influenced. The method comprises the steps that a plurality of paths of urban rail drainage network current analog signals collected by an open-close type Hall sensor are input to a signal conditioning board, the signals are converted into available analog signals after being amplified in equal proportion, the analog signals are input to a data collection card, the available analog signals are converted into drainage network current digital signals with alternating current interference signals after being processed by a low-pass filter circuit, a temperature null shift correction circuit and an analog-to-digital conversion circuit, the digital signals are transmitted wirelessly by a GPRS wireless transmission and receiving module, finally the plurality of paths of drainage network current digital signals are converged into an industrial personal computer, the plurality of paths of drainage network current digital signals are stored by a hard disk arranged in the industrial personal computer for later-stage synchronous analysis with direct current component digital signals of a neutral point of an electric main transformer, and urban rail drainage network current signals are output in a local visualization mode by utilizing a VGA video output interface of the.
And a GPS time service module is configured on the industrial personal computer to carry out synchronous time service on each path of signal, so that the time synchronization of the current digital signals of each path of drainage network is ensured. The arrangement of a plurality of monitoring nodes needs to comprehensively consider the positions and distances between the traction transformer sections, and the arrangement principle is determined as follows: and finding the nearest urban rail line position to the geographical position of the electric power main transformer with the DC magnetic biasing phenomenon, taking the urban rail line position as a reference point, bidirectionally arranging urban rail drainage network current monitoring nodes from the reference point, and sequentially arranging the distance positions of the monitoring nodes from the reference point to be 500m and 1000m to form an urban rail drainage network current monitoring section in the range of 3000 m. If a plurality of urban rail lines exist near the electric main transformer with the DC magnetic biasing phenomenon, the plurality of urban rail lines are provided with monitoring nodes according to the same principle.
2) The acquisition and processing of neutral point direct current signals of the main transformer of the urban electric power: an open-close type Hall current sensor is additionally arranged on a neutral point grounding bar of a main transformer of urban electric power. The open-close type Hall sensor is installed without power failure operation, and the normal operation of the main transformer of the urban electric power is not influenced. The method comprises the steps of inputting a transformer neutral point current analog signal acquired by an open-close type Hall sensor into a signal conditioning board, converting the analog signal into a usable analog signal after equal-proportion amplification, inputting the analog signal into a data acquisition card, converting the usable analog signal into a transformer neutral point direct current digital signal for removing power frequency and high-order frequency alternating current components after low-pass filtering, temperature and zero drift correction and analog/digital conversion, transmitting the transformer neutral point direct current digital signal into an industrial personal computer, storing the transformer neutral point direct current digital signal by using a hard disk built in the industrial personal computer for later period synchronous analysis with an urban rail drainage network current digital signal, and realizing local visual output of the main transformer neutral point current signal and the direct current component signal of the urban electric power main transformer by using a VGA video output interface external display screen of the industrial personal computer.
In order to ensure that the current signals of the neutral points of the electric main transformers are synchronous with the current signals of the urban rail drainage networks, a GPS time service module is configured on the industrial personal computer to carry out synchronous time service on the current signals of the neutral points of the electric main transformers and the direct current component signals thereof.
The open-close type Hall sensor consists of a primary circuit, a magnetic gathering ring, a Hall device, a secondary coil, an amplifying circuit and the like, and works in a magnetic balance type working mode. Specifically, a magnetic field generated by the current of the neutral point of the transformer to be detected in the main loop at the magnetic gathering ring is compensated by a magnetic field generated by the current of the secondary coil, so that the Hall device is in a zero-magnetic-flux dynamic balance working state.
3) The influence analysis of the urban rail traction power supply system on the direct current magnetic biasing of the urban electric power main transformer: the technical difficulty of direct measurement of the stray current in the ground caused by urban rail operation is high, the current distribution in the urban rail bar current network is close to the distribution trend of the stray current in the ground, and the measurement difficulty is relatively low, so that the stray current distribution in the ground is obtained by measuring the urban rail bar current network current signal analysis. The method comprises the steps of collecting urban rail drainage network current signals measured by a plurality of monitoring nodes and electric power main transformer neutral point direct current signals to a background server, calculating the distribution rule of urban rail drainage network currents in a monitoring interval by utilizing monitoring data of the monitoring nodes, further deducing the distribution rule of underground stray currents in the monitoring interval, synchronously analyzing coupling urban electric power main transformer neutral point direct current component signals, researching the correlation between the underground stray current distribution and the urban electric power main transformer neutral point direct current, and evaluating the influence degree of the urban rail stray currents on the urban electric power main transformer direct current magnetic biasing phenomenon.
One of the technical difficulties of synchronous coupling analysis is that time synchronization is achieved between each monitoring node in a drainage network current monitoring subsystem and an urban electric main transformer neutral point direct current monitoring subsystem, a GPS synchronous time service system is adopted in the system to achieve time synchronization of the subsystems, a GPS time service module is additionally arranged on industrial personal computers in the electric main transformer neutral point current monitoring subsystem and the drainage network monitoring subsystem, and the GPS system is used for providing a unified clock signal for the whole system to collect signals.
Compared with the prior art, the invention has the beneficial effects that.
The technical content is novel. The synchronous monitoring of the urban rail stray current and the neutral point direct current of the main transformer of the electric power is realized.
And secondly, the field implementation is simple. The measuring device is an open-close type Hall current sensor, is arranged at the cable connection part of the urban rail drainage grid and the neutral point grounding bar of the urban electric main transformer, and does not influence the normal operation of the urban rail and the urban power grid. Meanwhile, wireless measurement is partially realized, and arrangement and recovery of the device are facilitated.
And thirdly, the data information is rich. The method is used for monitoring the direct current magnetic biasing phenomenon of the main power transformer possibly caused by the stray current of the urban rail, so that the method not only comprises the current data of the neutral point of the main power transformer, but also comprises the distribution information of the stray current of the urban rail, and the influence degree of the stray current of the urban rail on the direct current magnetic biasing phenomenon of the main power transformer of the urban circuit is evaluated by comprehensive monitoring.
Fourthly, the system expansibility is high. In the design process, factors such as later-stage further development and the like are considered, and a data communication interface is reserved on the industrial personal computer platform, so that data support can be provided for inhibition of later-stage main current magnetic biasing of the electric main transformer and the like.
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The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
In the drawings:
FIG. 1 is a schematic overall flow diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
Fig. 1 shows that, according to a specific embodiment of the present invention, an urban rail traction power supply system and an urban electric power main transformer dc magnetic bias synchronous monitoring system are composed of:
the whole synchronous monitoring system is divided into three subsystems, namely a power main transformer neutral point current monitoring subsystem 1, an urban rail drainage grid current monitoring subsystem 2 and a comprehensive analysis subsystem 3; the hardware of the urban rail drainage network current monitoring subsystem 2 consists of a Hall sensor 17/18, a signal conditioning board 19/20, a data acquisition card 21/25, a GPRS wireless transmission module 29/30 and an industrial personal computer 31 in sequence; the hardware of the electric power main transformer neutral point current monitoring subsystem 1 is composed of a Hall current sensor 5, a signal conditioning board 6, a data acquisition card 7 and an industrial personal computer in sequence 11; the hardware of the synchronous comprehensive analysis subsystem 3 is composed of a background server 36.
The system is composed of an urban rail traction power supply system and an urban electric main transformer mainstream magnetic bias synchronous monitoring system, and can realize the following functions.
1) The method comprises the following steps of (1) urban rail drainage network current signal acquisition and processing: an open-close type Hall current sensor 17/18 is additionally arranged at the connecting cable of the drainage network in the urban rail transit line. The open-close type Hall sensor is installed without power failure operation, and normal operation of urban rail transit is not influenced. The multi-channel city rail drainage network current analog signals collected by the open-close type Hall sensor are input to the signal conditioning board 19/20, and are converted into usable analog signals after being amplified in equal proportion, the analog signal is input into a data acquisition 21/25 card and is processed by a low-pass filter circuit 22/26, a temperature null shift correction circuit 23/27 and an analog-to-digital conversion circuit 24/28 to become a drainage network current digital signal for removing alternating current interference signals, the digital signals are transmitted by GPRS wireless transmission 29/30 and a receiving module 32, finally, the multi-channel drainage network current digital signals are converged into the industrial personal computer 31, the multi-channel drainage network current digital signals are stored by a built-in hard disk 35 of the industrial personal computer 31 for later period and synchronous analysis with the power main transformer neutral point direct current component digital signals, and local visual output of the urban rail drainage network current signals is realized by an external display screen of a VGA video output interface of the industrial personal computer. The industrial personal computer is provided with a GPS time service module 34 to carry out synchronous time service on each path of signal, and the time synchronization of the current digital signal of each path of drainage network is ensured.
2) The acquisition and processing of neutral point direct current signals of the main transformer of the urban electric power: an open-close type Hall current sensor 5 is additionally arranged on a neutral point grounding bar of a main transformer of the urban electric power. The open-close type Hall sensor is installed without power failure operation, and the normal operation of the main transformer of the urban electric power is not influenced. The method comprises the steps of inputting a transformer neutral point current analog signal acquired by an open-close type Hall sensor into a signal conditioning board 6, converting the transformer neutral point current analog signal into a usable analog signal after equal-proportion amplification, inputting the analog signal into a data acquisition card 7, converting the usable analog signal into a transformer neutral point direct current digital signal for removing power frequency and high-order frequency alternating current components after low-pass filtering 8, temperature and zero drift correction 9 and analog/digital conversion 10 processing, transmitting the transformer neutral point direct current digital signal into an industrial personal computer 11, storing the transformer neutral point direct current component digital signal by using a hard disk 14 arranged in the industrial personal computer 11 for later period and synchronous analysis of an urban rail drainage network current digital signal, and realizing local visual output of the urban electric power neutral point current signal and the direct current component signal by using a VGA video output interface external display screen of the industrial personal computer. In order to ensure that the current signals of the neutral points of the power main transformers are synchronous with the current signals of the urban rail drainage networks, a GPS time service module 12 is configured on the industrial personal computer to carry out synchronous time service on the current signals of the neutral points of the power main transformers and the direct current component signals thereof.
3) The influence analysis of the urban rail traction power supply system on the direct current magnetic biasing of the urban electric power main transformer: the technical difficulty of direct measurement of the stray current in the ground caused by urban rail operation is high, the current distribution in the urban rail bar current network is close to the distribution trend of the stray current in the ground, and the measurement difficulty is relatively low, so that the stray current distribution in the ground is obtained by measuring the urban rail bar current network current signal analysis. The method comprises the steps of converging urban rail drainage network current signals and electric power main transformer neutral point direct current signals measured by a plurality of monitoring nodes to a background server 36, calculating the distribution rule of urban rail drainage network currents in a monitoring interval by utilizing monitoring data of the monitoring nodes, further deducing the distribution rule of stray currents in the monitoring interval, synchronously analyzing the coupling urban electric power main transformer neutral point direct current component signals, researching the correlation between the distribution of the stray currents in the ground and the urban electric power main transformer neutral point direct current, and evaluating the influence degree of the urban rail stray currents on the urban electric power main transformer direct current magnetic biasing phenomenon.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. The urban rail traction power supply system and the urban electric main transformer direct-current magnetic bias synchronous monitoring system are characterized by comprising three subsystems, namely an urban rail drainage network current monitoring subsystem, an electric main transformer neutral point current monitoring subsystem and a synchronous comprehensive analysis subsystem;
the hardware of the urban rail drainage network current monitoring subsystem is used for mutually transmitting data through a Hall sensor, a signal conditioning board, a data acquisition card, a GPRS wireless transmission module and an industrial personal computer;
the hardware of the electric main transformer neutral point current monitoring subsystem is subjected to data transmission by a Hall current sensor, a signal conditioning board, a data acquisition card and an industrial personal computer; the hardware of the synchronous comprehensive analysis subsystem provides communication data by a background server;
the industrial personal computers in the power main transformer neutral point current monitoring subsystem and the urban rail drainage network current monitoring subsystem are provided with GPS time service modules, and a GPS system is utilized to provide a unified clock signal for the whole system to collect signals of all paths;
the method comprises the steps that urban rail drainage network current signals measured by a plurality of monitoring nodes and electric power main transformer neutral point direct current signals are gathered to a background server, urban rail drainage network current distribution rules in monitoring intervals are obtained through calculation of monitoring data of the monitoring nodes, further, the distribution rules of stray currents in the ground in the monitoring intervals are deduced, coupling urban electric power main transformer neutral point direct current component signals are subjected to synchronous analysis, the correlation between the distribution of the stray currents in the ground and the urban electric power main transformer neutral point direct current is studied, and the degree of influence of the urban rail stray currents on the urban electric power main transformer direct current magnetic biasing phenomenon is evaluated.
2. The system of claim 1, wherein the collection and processing of the urban rail drainage network current signals in the urban rail drainage network current monitoring subsystem is performed by installing an open-close type Hall current sensor at a connecting cable of a drainage network in an urban rail transit line, inputting a plurality of current analog signals of the urban rail drainage network collected by the open-close type Hall sensor to a signal conditioning board, performing equal-proportion amplification processing to obtain usable analog signals, inputting the analog signals to a data acquisition card, performing low-pass filtering, temperature null shift correction and analog-to-digital conversion to obtain digital signals of the drainage network current without AC interference signals, transmitting the digital signals by GPRS wireless transmission and reception modules, and finally collecting the digital signals of the plurality of current drainage network current into an industrial personal computer, the method comprises the steps of storing a plurality of drainage network current digital signals by using a built-in hard disk of an industrial personal computer for later synchronous analysis with a direct current component digital signal of a neutral point of a main power transformer, realizing local visual output of the urban rail drainage network current signals by using a VGA video output interface of the industrial personal computer and an external display screen of the industrial personal computer, and ensuring time synchronization of the drainage network current digital signals of each path when the industrial personal computer is provided with a GPS time service module to carry out synchronous time service on the signals of each path.
3. The system of claim 1, wherein the subsystem for monitoring neutral point current of the main transformer is characterized in that an open-close Hall current sensor is additionally installed on a neutral point grounding bar of the main transformer, the analog signal of the neutral point current of the transformer collected by the open-close Hall sensor is input to a signal conditioning board, and is amplified in equal proportion to be converted into an available analog signal, the analog signal is input to a data acquisition card, and is converted into a digital signal of the neutral point direct current of the transformer for removing power frequency and high-order frequency alternating current components through low-pass filtering, temperature and null shift correction and analog/digital conversion, the digital signal of the neutral point direct current of the transformer is transmitted to the industrial personal computer, and a built-in hard disk is used for storing the digital signal of the current component of the industrial personal computer of the neutral point direct current of the transformer for later-stage synchronous analysis with the digital signal of the current of the urban rail drainage network, the method is characterized in that an industrial personal computer VGA video output interface is externally connected with a display screen to realize local visual output of a neutral point current signal and a direct current component signal of an urban power main transformer, and a GPS time service module is configured on the industrial personal computer to synchronously time service the neutral point current signal and the direct current component signal of each power main transformer in order to ensure that the current signal of the neutral point of the power main transformer is synchronous with the current signal of each urban rail drainage network.
4. The system for synchronously monitoring the urban rail traction power supply system and the urban electric main transformer direct-current magnetic bias according to claim 1, wherein a background server is arranged in the synchronous comprehensive analysis subsystem, and data processing, data storage and data display are performed through the background server.
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| CN110389250B (en) * | 2019-07-29 | 2021-06-15 | 武汉新电电气股份有限公司 | Device and method for early warning of DC magnetic bias event of transformer |
| CN111693892A (en) * | 2020-05-26 | 2020-09-22 | 广州市扬新技术研究有限责任公司 | Hall element-based method for realizing online monitoring of contact network leakage current |
| CN112415300B (en) * | 2020-10-25 | 2021-12-31 | 国网湖北省电力有限公司电力科学研究院 | Rail transit and transformer direct-current magnetic bias correlation analysis method |
| CN113709213A (en) * | 2021-08-03 | 2021-11-26 | 国网湖北省电力有限公司电力科学研究院 | DC magnetic bias live detection data synchronization method related to rail transit |
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| 长沙地铁轨道交通对交流电网的影响及治理措施的研究;刘味果等;《湖南电力》;20170228;全文 * |
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