Subway stray current comprehensive monitoring method based on multi-source fusion

Abstract

The invention discloses a metro stray current comprehensive monitoring method based on multi-source fusion, and the method comprises the steps: through the voltage (VOVPD) of a rail potential limiting device (OVPD) at a power substation, the current (IOVPD) of the rail potential limiting device (OVPD), the current A (Isubstation 1) of a strong current busbar cable of the power substation, the current B (Isubstation 2) of the strong current busbar cable of the power substation, the current (ISCCS) of a current drainage net cable and the rail potential (Vrail) near the power substation, carrying out the comprehensive monitoring of the stray current of the metro; the multi-source synchronous signal acquisition is used for comprehensively judging the stray current leakage condition in the traction interval. The method comprises the following specific steps: (1) synchronously carrying out multi-source current and voltage signal monitoring in the metro traction interval; (2) synchronously processing multi-source current and voltage signal monitoring results in the metro traction interval; (3) according to the multi-source current and voltage signal monitoring result, calculating the total amplitude of the stray current in a single interval at each moment in the monitoring time period; and (4) calculating the total electric quantity of stray current leakage in the single traction interval in the monitoring time period. According to the method, the limitation that the stray current is judged by adopting a polarization potential single signal in a traditional method at present is avoided, the comprehensiveness, accuracy and reliability of monitoring can be remarkably improved, the limitation of a single source is overcome, and deep information mining is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to a stray current monitoring method, in particular to a subway stray current comprehensive monitoring method based on multi-source fusion. BACKGROUND

[0002] Subway stray current is a phenomenon of current leakage caused by the decline of track-ground insulation performance during the operation of subway DC traction system, which can cause irreversible and serious electrochemical corrosion damage to the surrounding third-party buried metal structure, seriously threatening the safety and reliability of the subway system. At present, the monitoring of subway stray current in the traction section mainly relies on the indirect judgment of the polarization potential of the theme reinforced concrete structure. If the polarization potential is higher than the standard value, it is determined that the stray current leakage in the section is out of limit, and the drainage cabinet needs to be opened for effective stray current drainage. However, the existing method can only qualitatively judge the stray current leakage in the section, and cannot accurately know the specific leakage amount of stray current, nor can it judge the leakage direction and specific leakage area positioning information, which is not conducive to the precise prevention and control of stray current.

[0003] In view of this, the present application provides a subway stray current comprehensive monitoring method based on multi-source fusion, which synchronously acquires multi-source information closely related to stray current leakage, including the voltage signal and current signal of the track potential limiting device (OVPD) at the substation, the strong current busbar cable current signal at the substation, the drainage network cable current signal, and the track potential signal near the substation, calculates the total amplitude of stray current in a single traction section at each time in the monitoring period and the total electric quantity of stray current leakage in a single traction section in the monitoring period, and realizes comprehensive monitoring of stray current. SUMMARY

[0004] In order to achieve the above purpose, the present application provides a subway stray current comprehensive monitoring method based on multi-source fusion, which realizes real-time monitoring of parameters closely related to stray current leakage.

[0005] The technical scheme implemented by the present application is as follows:

[0006] A subway stray current comprehensive monitoring method based on multi-source fusion mainly includes the following monitoring contents: the voltage (V OVPD ) and current (I OVPD ) of the track potential limiting device (OVPD) at the substation, the strong current busbar cable current (I substation1 ) and the strong current busbar cable current (I substation2 ) at the substation, the drainage network cable current (I SCCS ) and the track potential (V rail ) near the substation.

[0007] The steps include:

[0008] Step 1: Simultaneously check the voltage (V) of the track potential limiting device (OVPD) at the substation. OVPD ) and current (I) OVPD ), substation high-voltage busbar cable current (I substation1 ) and the current of the substation's high-voltage busbar cable (I substation2 ), Drainage network cable current ((I SCCS ) and track potential near the substation (V rail Monitoring of )

[0009] Step 2: Based on the monitoring period T = {t1, t2, ..., t...} i ,……,t n}, obtain the orbit potential limiting device (OVPD) voltage (V OVPD Monitoring results V OVPD ={V OVPD 1 V OVPD 2 ,……,V OVPD i ,……,V OVPD n} and current (I OVPD Monitoring Results I OVPD ={I OVPD 1 ,I OVPD 2 ,……,I OVPD i ,……,I OVPD n}, obtain the substation high-voltage busbar cable current (I substation1 ) and the current of the substation's high-voltage busbar cable (I substation2 Monitoring Results I substation1 ={I substation1 1 ,I substation1 2 ,……,I substation1 i ,……,I substation1 n},I substation2 ={I substation2 1 ,I substation2 2 ,……,I substation2 i ,……,I substation2 n}, obtain the drainage network cable current ((I SCCS Monitoring Results I SCCS ={I SCCS 1,I SCCS 2 ,……,I SCCS i ,……,I SCCS n}, obtain the track potential (V) near the substation rail Monitoring results V rail ={V rail 1 V rail 2 ,……,V rail i ,……,V rail n}

[0010] Step 3: Obtain the total amplitude I of stray current in a single traction section at various times during the monitoring period. stray ={I stray 1 ,I stray 2 ,……,I stray i ,……,I stray n The calculation method is as follows:

[0011]

[0012] Among them, I stray i For t i The total amplitude of stray current in a single traction section at a given time, I traction i For t i The amplitude of the traction current in a single traction section at any given time, I substation1 i and I substation2 i For t i At any given moment, the amplitude of the high-voltage busbar current of two substations within a single traction section, I SCCS i For t i The amplitude of the drain network cable current in a single traction section at any given time, I OVPD i For t i The amplitude of the OVPD current at the substation within a single traction section at any given time;

[0013] Step 4: Obtain the total stray current leakage charge Qstray within a single traction section during the monitoring period. The calculation method is as follows:

[0014]

[0015] Further technical solutions: the voltage (V OVPD ) and current (I OVPD ) monitoring method of the track potential limiting device (OVPD) is:

[0016] I. The non-contact intelligent sensor is arranged at the current signal introduction of the track potential limiting device (OVPD), a test cable introduces a test signal into a collection card, the collection card converts an analog signal into a digital signal and transmits the digital signal to an upper computer, and the upper computer completes continuous collection and storage of the signal, the upper computer is configured to be powered by a separate power supply and has a storage function.

[0017] II. The test cable is connected in parallel at both ends of the voltage monitoring module of the track potential limiting device (OVPD), the test cable introduces a test signal into a signal transmitter, the signal transmitter completes filtering and noise elimination of hardware, converts the signal into a signal collection range of a collection card, and transmits the signal to the collection card, the collection card converts an analog signal into a digital signal and sends the digital signal to an upper computer, and the upper computer completes continuous collection and storage of the signal, the upper computer is configured to be powered by a separate power supply and has a storage function, and the upper computer is configured in a double-path mode.

[0018] Further technical solutions: the current (I substation1 ) and current (I substation2 ) monitoring method of the strong electric cable of the transformer substation busbar is:

[0019] The non-contact intelligent sensor is arranged at the return current loop of the transformer substation busbar and the steel rail return current loop of the transformer substation respectively, the non-contact intelligent sensor is sequentially connected with a signal transmitter, a collection card and an upper computer through a test cable, the upper computer is configured to be powered by a separate power supply and has a storage function, the collection card converts an analog signal into a digital signal and transmits the digital signal to the upper computer, and the upper computer completes continuous collection and storage of the current signal.

[0020] Further technical solutions: the current (I SCCS ) monitoring method of the drain cable is:

[0021] The non-contact intelligent sensor is arranged at the expansion joint connecting cable, the non-contact intelligent sensor is sequentially connected with a mobile collection device and an upper computer through a test cable, the upper computer is configured to be powered by a separate power supply and has a storage function, the collection card converts an analog signal into a digital signal and transmits the digital signal to the upper computer, and the upper computer completes continuous collection and storage of the current signal.

[0022] Further technical solutions: the track potential (V rail ) monitoring method is:

[0023] Adopt at least one hundred meters one big interval step point mode, two to three points are stepped once, so as to find out the concentrated section of track potential high and the approximate distribution trend of track potential as soon as possible, select track measurement points A, B, C... N, and automatically collect and record the ground voltage of A, B, C... N points by using the computer automatic data acquisition system, and the common reference ground potential of each measurement point is configured as structural steel bar.

[0024] The beneficial effects of the present application are:

[0025] The present application provides a kind of metro stray current comprehensive monitoring method based on multi-source fusion, can realize the real-time monitoring of parameter closely related with metro stray current leakage, and calculate the distribution of stray current with time in traction section and total leakage power, effectively overcome the limitation of single source, improve the comprehensiveness, accuracy and reliability of stray current monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A kind of metro stray current comprehensive monitoring method based on multi-source fusion process chart provided by the present application;

[0027] Figure 2 The voltage (V OVPD ) and current (I OVPD ) monitoring method schematic diagram of the OVPD of substation track potential limiting device (OVPD) provided by the present application;

[0028] Figure 3 The current (I substation1 ) and current (I substation2 ) monitoring method schematic diagram of the strong power busbar cable of substation provided by the present application;

[0029] Figure 4 The drain net cable current (I SCCS ) monitoring method schematic diagram provided by the present application;

[0030] Figure 5 The track potential (V rail ) monitoring method schematic diagram near substation provided by the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] As Figure 1The monitoring process is as follows: First, the multi-source current and voltage signals within the subway traction section are monitored synchronously. Second, the multi-source current and voltage signals within the subway traction section are processed synchronously. Third, the monitoring results of the multi-source current and voltage signals are summarized and calculated to determine the total amplitude of stray current in a single section at each moment during the monitoring period. Finally, the total leakage of stray current in a single section is calculated. The specific operation plan is as follows: The voltage (V) of the track potential limiting device (OVPD) at the substation is simultaneously monitored. OVPD ) and current (I) OVPD ), substation high-voltage busbar cable current (I substation1 ) and the current of the substation's high-voltage busbar cable (I substation2 ), Drainage network cable current ((I SCCS ) and track potential near the substation (V rail )monitor.

[0033] The steps include:

[0034] Step 1: Simultaneously check the voltage (V) of the track potential limiting device (OVPD) at the substation. OVPD ) and current (I) OVPD ), substation high-voltage busbar cable current (I substation1 ) and the current of the substation's high-voltage busbar cable (I substation2 ), Drainage network cable current ((I SCCS ) and track potential near the substation (V rail Monitoring of )

[0035] Step 2: Based on the monitoring period T = {t1, t2, ..., t...} i ,……,t n}, obtain the orbit potential limiting device (OVPD) voltage (V OVPD Monitoring results V OVPD ={V OVPD 1 V OVPD 2 ,……,V OVPD i ,……,V OVPD n} and current (I OVPD Monitoring Results I OVPD ={I OVPD 1 ,I OVPD 2 ,……,I OVPD i ,……,I OVPD n}, obtain the substation high-voltage busbar cable current (I substation1 ) and the current of the substation's high-voltage busbar cable (Isubstation2 ) monitoring result I substation1 = {I substation1 1 ,I substation1 2 ,……,I substation1 i ,……,I substation1 n},I substation2 = {I substation2 1 ,I substation2 2 ,……,I substation2 i ,……,I substation2 n}, obtain the cable current (I SCCS ) monitoring result I SCCS = {I SCCS 1 ,I SCCS 2 ,……,I SCCS i ,……,I SCCS n}, obtain the track potential (V rail ) monitoring result V rail = {V rail 1 ,V rail 2 ,……,V rail i ,……,V rail n}.

[0036] Step 3: obtain the total amplitude of the single traction section stray current at each time within the monitoring period I stray = {I stray 1 ,I stray 2 ,……,I stray i ,……,I stray n}, the calculation method is:

[0037]

[0038] wherein I stray i is the total amplitude of the stray current in the single traction section at t i time, I traction i is the total amplitude of the stray current in the single traction section at t iThe amplitude of the traction current in a single traction section at any given time, I substation1 i and I substation2 i For t i At any given moment, the amplitude of the high-voltage busbar current of two substations within a single traction section, I SCCS i For t i The amplitude of the drain network cable current in a single traction section at any given time, I OVPD i For t i The amplitude of the OVPD current at the substation within a single traction section at any given time;

[0039] Step 4: Obtain the total stray current leakage charge Qstray within a single traction section during the monitoring period. The calculation method is as follows:

[0040]

[0041] At this point, the total amount of stray current leakage can be obtained.

[0042] like Figure 2 The content shown is the voltage (V) of the orbital potential limiting device (OVPD). OVPD ) and current (I) OVPD The monitoring method is as follows:

[0043] 1. Place the non-contact intelligent sensor at the current signal inlet of the track potential limiting device (OVPD). The test cable introduces the test signal into the acquisition card. The acquisition card converts the analog signal into a digital signal and transmits it to the host computer. The host computer then performs continuous acquisition and storage of the signal. The host computer is equipped with a separate power supply and has a storage function.

[0044] 2. Connect the test cable in parallel across both ends of the track potential limiting device (OVPD) voltage monitoring module. The test cable introduces the test signal into the signal transmitter. The signal transmitter performs hardware filtering and noise reduction to convert the signal into the signal acquisition range of the acquisition card and transmits it to the acquisition card. The acquisition card converts the analog signal into a digital signal and sends it to the host computer. The host computer then performs continuous acquisition and storage of the signal. The host computer is configured with a separate power supply and has a storage function, and is configured in dual-channel mode.

[0045] like Figure 3 The content shown is the current (I) of the high-voltage busbar cable of the substation. substation1 ) and the current (I) of the substation power busbar cable substation2 The monitoring method is as follows:

[0046] Non-contact intelligent sensors are installed at the return circuit of the substation drain cabinet and the return circuit of the substation rail. The non-contact intelligent sensors are connected in sequence to a signal transmitter, a data acquisition card and a host computer via test cables. The host computer is equipped with a separate power supply and has a storage function. The data acquisition card converts the analog signal into a digital signal and transmits it to the host computer, which then completes the continuous acquisition and storage of the current signal.

[0047] like Figure 4 The content shown is the current of the drainage network cable ((I) SCCS The monitoring method is as follows:

[0048] A non-contact intelligent sensor is installed at the connection cable of the expansion joint. The non-contact intelligent sensor is connected to a mobile acquisition device and a host computer in sequence via a test cable. The host computer is equipped with a separate power supply and has a storage function. The acquisition card converts the analog signal into a digital signal and transmits it to the host computer, where the host computer continuously acquires and stores the paired current signals.

[0049] like Figure 5 The content shown is the orbital potential (V) rail The monitoring method is as follows:

[0050] Using a large-interval stepping method of at least 100 meters between points, two to three points are taken at a time to quickly identify concentrated sections with high track potential and the general distribution trend of track potential. Track measurement points A, B, C...N are selected, and the ground voltage of each point A, B, C...N is automatically collected and recorded using a computer automatic data acquisition system. The common reference ground potential of each measurement point is configured as structural reinforcement.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metro stray current comprehensive monitoring method based on multi-source fusion, characterized in that, The method comprises collecting data of voltage of the track potential limiting device, current of the track potential limiting device, cable current A of the strong current busbar of the substation, cable current B of the strong current busbar of the substation, cable current of the drainage network and track potential within a monitoring period, wherein the voltage of the track potential limiting device, the current of the track potential limiting device and the track potential are data of the substation; According to the collected data, the total amplitude I of the stray current in a single traction section during the monitoring period is obtained stray i The calculation formula is: Wherein, the I stray i The I i The I traction i The I i The I substation1 i The I i The I substation2 i The I i The I SCCS i The I i The I OVPD i The I i The I According to the calculation data, total stray current leakage Qstray within a single traction section within the monitoring period is obtained, and the calculation formula is: 2.The metro stray current comprehensive monitoring method based on multi-source fusion according to claim 1, wherein, The voltage of the track potential limiting device and the current monitoring method of the track potential limiting device are as follows: I. A non-contact intelligent sensor is arranged at a current signal introduction position of the track potential limiting device, a test cable introduces a test signal into a collection card, the collection card converts an analog signal into a digital signal and transmits the digital signal to an upper computer, and the upper computer completes continuous collection and storage of the signal, the upper computer is configured to be powered by a separate power supply and has a storage function. II. The test cable is connected in parallel at two ends of a voltage monitoring module of the track potential limiting device, the test cable introduces a test signal into a signal transmitter, the signal transmitter completes filtering and noise elimination of hardware, converts the signal into a signal collection range of the collection card and transmits the signal to the collection card, the collection card converts an analog signal into a digital signal and transmits the digital signal to the upper computer, and the upper computer completes continuous collection and storage of the signal, the upper computer is configured to be powered by a separate power supply and has a storage function, and the upper computer is configured in a double-path mode. 3.The metro stray current comprehensive monitoring method based on multi-source fusion according to claim 1, characterized in that, The cable current A of the strong current busbar of the substation and the cable current B of the strong current busbar of the substation are monitored by the following method: Non-contact intelligent sensors are arranged at a return loop of a drainage cabinet of the substation and a return loop of a steel rail of the substation respectively, the non-contact intelligent sensors are sequentially connected with a signal transmitter, a collection card and an upper computer through test cables, the upper computer is configured to be powered by a separate power supply and has a storage function, and the collection card converts an analog signal into a digital signal and transmits the digital signal to the upper computer, and the upper computer completes continuous collection and storage of the current signal.

4. The metro stray current comprehensive monitoring method based on multi-source fusion according to claim 1, characterized in that, The cable current of the drainage network is monitored by the following method: A non-contact intelligent sensor is arranged at a expansion joint connecting cable, the non-contact intelligent sensor is sequentially connected with a mobile collection device and an upper computer through a test cable, the upper computer is configured to be powered by a separate power supply and has a storage function, and the collection card converts an analog signal into a digital signal and transmits the digital signal to the upper computer, and the upper computer completes continuous collection and storage of the current signal.

5. The metro stray current comprehensive monitoring method based on multi-source fusion according to claim 1, characterized in that, The track potential monitoring method is as follows: At least one hundred meters of large-interval step points are adopted to find out a concentrated section of high track potential and a general distribution trend of the track potential as soon as possible, track measurement points A, B, C, …, N are selected, and a computer automatic data collection system is used to automatically collect and record voltages of the points A, B, C, …, N to the ground, and a common reference ground potential of the measurement points is configured as a structural steel bar.

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