CN112230084A - Track signal alternating current-direct current voltage acquisition system - Google Patents
Track signal alternating current-direct current voltage acquisition system Download PDFInfo
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Abstract
The invention discloses a track signal alternating current-direct current voltage acquisition system, which comprises a display unit, a programming switch and a peripheral circuit, wherein the display unit, the programming switch and the peripheral circuit are respectively in data interaction with an operation and control unit, the communication unit is in data interaction with the operation and control unit, an interface protection and communication unit is in data interaction with the communication unit, an analog signal acquisition unit, a gain adjustment unit, a signal conditioning unit, an A/D unit and the operation and control unit are sequentially in signal connection along a data transmission direction, the analog signal acquisition unit and the gain adjustment unit are respectively in signal connection with the operation and control unit along the data transmission direction, a signal channel diagnosis unit is in signal connection between the analog signal acquisition unit and the operation and control unit, and a switching value acquisition unit is used for transmitting. The invention collects and processes the AC and DC voltage in the track signal, realizes the collection of various voltage signal data in one system, and has the characteristics of high precision, low temperature drift, high reliability, flexible configuration, convenient installation and debugging, and the like.
Description
Technical Field
The invention relates to the field of track circuit electrical monitoring, in particular to a track signal alternating current-direct current voltage acquisition system.
Background
The demand of the intelligent comprehensive collector for the alternating current and direct current voltage of the track signal centralized monitoring and maintenance support system is urgent, the traditional alternating current and direct current voltage collector is only designed facing a collection object, and a collector needs to be newly added to remove productization aiming at the alternating current and direct current voltage collection object under a track signal scene, so that great troubles are caused for purchasing, engineering implementation and later maintenance work. The transmission bandwidth capability of the traditional alternating current and direct current voltage collector is a bottleneck, the friendly interaction between the collector and an upper computer is limited, the overall design is lacked, and particularly, the simplicity of application and maintenance on site is not brought by fully considering the intelligent requirement.
Disclosure of Invention
The invention aims to solve the technical problems that the track signal acquisition and detection device is a dispersed component, has different respective measuring ranges and different precision ranges, is difficult to integrate and is inconvenient to use, and aims to provide a track signal alternating current and direct current voltage acquisition system which solves the problem of uniform acquisition and collection of the alternating current and direct current voltage of the track signal.
The invention is realized by the following technical scheme:
a rail signal alternating current-direct current voltage acquisition system comprises a display unit, a programming switch, a peripheral circuit, a signal conditioning unit, a gain adjustment unit, an analog signal acquisition unit, an A/D unit, a signal channel diagnosis unit, a switching value acquisition unit, an operation and control unit, a communication unit and an interface protection unit; the display unit, the programming switch and the peripheral circuit are respectively in data interaction with the operation and control unit, the communication unit is in data interaction with the operation and control unit, the interface protection is in data interaction with the communication unit, the analog signal acquisition unit, the gain adjustment unit, the signal conditioning unit, the A/D unit and the operation and control unit are sequentially in signal connection along a data transmission direction, the analog signal acquisition unit and the gain adjustment unit are respectively in signal connection with the operation and control unit along the data transmission direction, the signal channel diagnosis unit is in signal connection between the analog signal acquisition unit and the operation and control unit, and the switching value acquisition unit is used for transmitting data to the operation and control unit.
A track signal alternating current and direct current voltage acquisition system is a basic function module in a signal centralized monitoring system. The on-line monitoring of various signals is realized by adopting photoelectric coupling and electromagnetic isolation technology, a professional MCU, a programmable self-adaptive circuit and self-diagnosis technology, and the self-diagnosis coverage rate of a key circuit reaches 50%. The device has the characteristics of high precision, low temperature drift, high reliability, flexible configuration, convenience in installation and debugging and the like. The invention collects and processes the AC and DC voltage in the track signal in a unified way, and realizes the collection and processing of various voltage signal data in one system. The module address is remotely configured through the configuration tool, the address code is not required to be manually set, the address code is automatically identified, the address information is displayed in real time, and remote configuration modification is supported.
The signal input end transmits data to the analog signal acquisition unit, and the data of the signal input end comprises turnout indication voltage, power supply screen voltage, alternating current continuous track voltage, phase-sensitive track voltage, semi-self-closing voltage, inter-station contact voltage and disaster prevention voltage.
Furthermore, the data acquisition of the signal input end is in a centralized acquisition mode, and the signal input end adaptively identifies alternating current signals or direct current signals.
Furthermore, the acquisition system also comprises a power module, and the power module supplies power to the acquisition system.
Further, still include online upgrade module, online upgrade module carries out online upgrade through the CAN bus, specifically includes: the upper computer sends a fixed command, the bus module is switched to a program upgrading state, the module enters the program upgrading state, the upper computer sends a data packet of an upgrading version program to the module, the module returns verification information after receiving all the data packets, and after the upper computer confirms that the data received by the module is correct, the upper computer sends a module resetting command, and the module runs a new program.
Furthermore, the system also comprises an alarm function module, wherein the alarm function module comprises an MCU (microprogrammed control Unit) restart alarm, a collection channel failure alarm, a working voltage and current monitoring and a watchdog restart alarm.
Furthermore, MCU restart alarm and working voltage abnormal state self-checking alarm are realized by cold and hot start judgment and/or PVD detection, two pieces of nonvolatile memories are designed redundantly to store module system data, module internal data self-checking alarm and memory failure alarm are realized, a simulation acquisition channel applies standard signal source excitation through a fixed period, working power supply range monitoring realizes acquisition channel failure alarm and working power supply abnormal alarm, a special power supply management chip is adopted, module working voltage and current self-checking alarm is realized, watchdog reset detection, RAM mark data comparison and system reset state identification realize the watchdog restart alarm function. The coverage rate of all faults can be more than 40 percent by counting the number of the fault alarm information which can be realized.
Furthermore, receiving an instruction of an upper computer according to an agreed condition, judging whether a voltage acquisition channel carries out fault recording and broadcasting, selecting the main frequency 168M, enabling the AD sampling rate to be up to 1M/s at most, externally expanding the RAM of not less than 4M, realizing fault data storage of the 8-path voltage acquisition channel, adopting a floating data storage technology, updating data downwards, and transmitting the data according to an agreed protocol through a CAN bus. And each fault channel records two groups of waveforms, wherein the recording time of each group of waveforms is 60 seconds, and the data sampling period is 0.5 ms.
Further, the acquisition system includes a unique identification number in 18 decimal digits.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the on-line monitoring of various signals is realized by adopting photoelectric coupling and electromagnetic isolation technology, a professional MCU, a programmable self-adaptive circuit and self-diagnosis technology, and the self-diagnosis coverage rate of a key circuit reaches 50%. The device has the characteristics of high precision, low temperature drift, high reliability, flexible configuration, convenience in installation and debugging and the like. All parameters are uploaded through a CAN bus, and the patrol period meets the file requirements of 'technical conditions of railway signal centralized monitoring system' No. 709 of fortune base signal [ 2010 ].
Drawings
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 view of the acquisition system of the present invention;
FIG. 2 is a flowchart of an upgrade function implementation;
FIG. 3 is a schematic diagram of a functional configuration;
FIG. 4 is a customized reference model of a liquid crystal display;
FIG. 5 is a design flow of voltage acquisition;
fig. 6 is a schematic view of attribute configuration.
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.
Example 1
The embodiment 1 is a system for acquiring a track signal alternating current and direct current voltage, which, as shown in fig. 1, includes a display unit, a programming switch, a peripheral circuit, a signal conditioning unit, a gain adjusting unit, an analog signal acquisition unit, an a/D unit, a signal channel diagnosis unit, a switching value acquisition unit, an operation and control unit, a communication unit, and an interface protection; the display unit, the programming switch and the peripheral circuit are respectively in data interaction with the operation and control unit, the communication unit is in data interaction with the operation and control unit, the interface protection and communication unit is in data interaction with the communication unit, the analog signal acquisition unit, the gain adjustment unit, the signal conditioning unit, the A/D unit and the operation and control unit are sequentially in signal connection along the data transmission direction, the analog signal acquisition unit and the gain adjustment unit are respectively in signal connection with the operation and control unit along the data transmission direction, a signal channel diagnosis unit is in signal connection between the analog signal acquisition unit and the operation and control unit, and the switching value acquisition unit is used for transmitting data to the operation and control unit.
A track signal alternating current and direct current voltage acquisition system is a basic function module in a signal centralized monitoring system. The on-line monitoring of various signals is realized by adopting photoelectric coupling and electromagnetic isolation technology, a professional MCU, a programmable self-adaptive circuit and self-diagnosis technology, and the self-diagnosis coverage rate of a key circuit reaches 50%. The device has the characteristics of high precision, low temperature drift, high reliability, flexible configuration, convenience in installation and debugging and the like. All parameters are uploaded through a CAN bus, and the patrol period meets the file requirements of 'technical conditions of railway signal centralized monitoring system' No. 709 of fortune base signal [ 2010 ].
And (3) address configuration, namely, the module address is remotely configured through a configuration tool, the collection module is installed in a centralized manner without manually setting an address code, the address code is automatically identified, the address information is displayed in real time, and remote configuration modification is supported.
The centralized installation collection modules are powered on and then actively send identification ID codes to the communication extension set, and the communication extension set sends all the collection modules hung down to the station set together with CAN channel coding information. And the station software carries out address allocation on each ID code according to the address allocation strategy, establishes an ID code and address corresponding table and issues the corresponding table to the interface extension. And the interface extension completes address distribution of each acquisition module. And after receiving the address, each module completes the configuration of the address and displays the address.
The centralized installation acquisition module provides an address setting command and supports the upper computer to remotely configure the module address through a configuration tool.
The working state indicator lamp is provided with 1 power supply LED lamp and represents the power supply state of the power supply. If the power supply supplies power normally, the LED lamp is on normally, and if the power supply supplies power abnormally, the LED lamp is off. The LED lamp needs to be green in color.
And each state indication of the module is realized by adopting a low-power consumption control circuit and a high-brightness LED device, and the indicator lamp is arranged on a front panel of the shell. The function of the indicator light is detailed in table 1.
TABLE 1 functional description table of working status indicator lamp
And function configuration, namely remotely configuring the module to realize the function type through a configuration tool. And receiving the function type configuration data transmitted by the upper computer through the CAN bus according to the agreed communication protocol. And the MCU completes function type switching according to the configuration data. The storage and power-off saving of the function type configuration information is implemented using an external non-volatile memory, as shown in fig. 3.
And (3) evaluating the voltage measurement range, wherein the voltage acquisition test range is 0-500VDC/AC, and the evaluation system adopts the concept of relative error, namely, the range gear is taken as a reference value, and the relative error relative to the range gear is +/-1%. The index is evaluated within the full test range.
Voltage measurement range: 0-500 VDC/AC.
Frequency: DC, 20-65 Hz, and the frequency shift is 450-3000 Hz.
When the voltage measurement range of the range gear position value is 50% -120%, the reference error relative to the range gear position is +/-0.5%.
When the voltage is measured in the voltage measuring range of 5-50% of the range gear value, the reference error relative to the range gear is +/-1%.
And the online upgrading function module has the capability of upgrading the module program online through the CAN bus. IAP (In-application programming) technology is used. And the upper computer finishes the on-line upgrading of the curing program according to the communication protocol through the CAN bus. The power supply of the module or the shell of the module is not required to be disconnected in the whole process. As shown in fig. 2.
And the display function is used for displaying the module address, the function type and the like. Meanwhile, the display module needs to be provided with a lighted switch, the key is turned on, and the display module is turned off when the key is formally turned on.
And the customized liquid crystal is used as a display module for displaying information such as equipment address, function type, fault code, fault signal path and the like. As shown in fig. 4. The display module is provided with a control switch, and the display can be turned on or off through the control switch. Pressing the control switch, starting display, and pressing the control switch for 3 seconds to close the display; after the display is started, if the closing action is not needed, the display module is automatically closed after 1 minute; the display areas of the display module and their functional descriptions are shown in table 2.
TABLE 2 display area and functional description thereof
Voltage acquisition, voltage module need possess 8 voltage acquisition passageways, and the module adopts the mode of concentrating the collection. The signal acquisition of 8 channels should be able to adaptively identify ac signals or dc signals. The operation rate needs to meet the requirement of simultaneously demodulating the low-frequency carrier frequency information of 8 paths of frequency shift voltage signals, the main frequencies of the 8 paths of frequency shift signals are independent respectively and can be set randomly, and the input impedance of frequency shift receiving needs to be 2M omega (needs to be a high-performance CPU). As shown in fig. 5.
The front-end protection circuit adopts combined protection devices such as a fuse, a thermistor and the like to realize circuit protection under abnormal input. When the input voltage exceeds 3 times of the rated input value and the current is more than 200mA, the high end and the low end of the input loop are disconnected, and the input loop is in an open circuit state. The current collected by the input loop is not more than 1mA, and the work of the monitored equipment is not influenced. The input loop adopts a high-resistance device, and the input resistance is greater than 2M omega. And a photoelectric isolation device is selected to realize signal isolation of the front end and the rear end, and the collected voltage signal passes through the circuit completely and nondestructively. The signal-to-noise ratio of the signal is improved through the gain control and signal conditioning circuit, the amplification factor is adjusted according to the amplitude of the field input signal so as to adapt to the range of the ADC to the maximum extent, and the detection precision of the voltage signal is improved. The control system adopts digital filtering and signal frequency spectrum algorithm to monitor AC signal and DC signal in self-adapting mode. And voltage acquisition adopts a fault self-diagnosis technology to realize self-diagnosis of each acquisition channel. The high-performance MCU is adopted to control the chip, the main frequency is 168MHz, the chip performance is 1.25DIMPS/MHz, the low-frequency carrier frequency information demodulation of 8 paths of frequency shift voltage signals can be realized simultaneously, the frequency shift voltage signals are acquired independently, the main frequency can be set independently, and the acquisition of other paths of frequency shift signals is not influenced.
Switching value acquisition, namely, for a voltage acquisition module, an 8-channel switching value input port is required; for a current acquisition module, a 9-channel switching value input port is required; for a module for power collection, a 3-channel switching value input port is required. The switching value level is 12V.
The switching value acquisition front end adopts transient suppression diodes, anti-surge resistors, anti-reverse elements and other protection devices, and has protection functions under the conditions of switching value signal over-limit, transient abnormal impact, field wiring misoperation and the like. The photoelectric isolation technology is adopted to realize the safe isolation and collection of the switching value signals, and the stable acquisition of the switching value signals is realized through the rear-end matching circuit. The switching value amplitude control is realized by adopting a threshold circuit, and the specific state judgment condition is shown in table 3.
TABLE 3
| Switching value voltage amplitude | Switching value state |
| VIN≥8.4V | High level |
| VIN≤3.6V | Low level of electricity |
The switching value acquisition is matched with the voltage acquisition, the current acquisition and the power acquisition. The number of sampling paths for a specific switching value is shown in table 4.
TABLE 4
| Type of acquisition | Number of collected |
| Voltage acquisition | |
| 8 | |
| |
9 |
| |
3 |
The CAN communication interface adopts a CAN bus, the communication protocol adopts a CAN2.0B protocol, and the baud rate is set to be 250 kbps.
A communication interface: optoelectronic isolation CAN bus interface, isolation withstand voltage grade: 2000VAC/1mA, 1 min.
Interface protection: specific indexes of the EMC protection circuit are shown in Table 5.
TABLE 5
The communication protocol is as follows: CAN2.0B.
Baud rate: 250 kbps.
Communication error rate: less than or equal to 1X 10-5。
Communication distance: less than or equal to 270 m.
A spare 120-ohm resistor is arranged in the module, and when the bus does not have the matching resistor, the matching resistor in the module can be connected.
The working power supply is self-protected under the conditions of overcurrent, overvoltage or reverse connection, and the module can continue to work normally after the power supply is recovered to be normal. The power supply port and the high-voltage signal acquisition port are both provided with fuses to prevent rear-end devices from being damaged due to overcurrent. The device for the power supply and the I/O port with high input impedance comprises a voltage dependent resistor, a TVS (transient overvoltage), a TSS (transient overvoltage/overcurrent) and the like, wherein the voltage dependent resistor, the TVS, the TSS and the like are designed for clamping and absorbing the transient overvoltage/overcurrent (surge) formed by braking of a high-power device of an induction lightning or power grid, and the I/O port with high input impedance is designed with a certain amount of high-power, high-insulation and voltage-resistant resistors, so that the voltage is reduced to be within the bearable range of.
And the tolerance of data fluctuation is high, when the monitoring signal is normal, the acquired data must be faithful to the actual situation on site, and the situation of sudden change, burr or pit drop caused by the module is not allowed. And under the condition of abnormal communication, the communication state of the communication extension is reflected in real time, and the upper computer judges and processes the communication state. The communication extension does not perform the operation of delay filling. For the software filtering method, the filtering parameters can be set.
And the communication extension records and reflects the communication state of the module in real time. When the communication is normal, the communication extension set does not process any output data and transmits the output data to the upper computer. When the communication is abnormal, the communication extension faithfully records abnormal information, such as the occurrence time, duration, error type and the like, and reports to the upper computer for processing. And if the output data of the product adopts a software filtering mode, a software filtering parameter configuration function is provided, and the filtering parameters are set through software of an upper computer.
Has 18 decimal unique identification numbers. The identification number should be stored in the ROM unit at the same time for subsequent re-reading. The unique identification number exists as a tracking number for asset management throughout the life cycle of the module. The unique identification number of the product is read only and cannot be modified. The unique identification number of the product realizes automatic backup of the unique identification number by adopting a double-region storage mode and a CRC (cyclic redundancy check) technology, and the storage reliability is improved.
The attributes of each functional item, including signal frequency, sampling rate, acquisition range, output multiplying power and the like, have settable capacity. The addition of the functional items does not change the main program of the collector. The module transmits the attribute configuration data of the functional items according to the appointed communication protocol through the CAN bus. And the external nonvolatile memory is adopted to realize the storage and power-off saving of the attribute configuration data of the functional items. The MCU completes the modification of the configuration data of the function items and executes data processing according to the configuration content. As shown in fig. 6.
In order to meet the requirements of future fault analysis, the voltage acquisition module has a fault recording and broadcasting function, each path of voltage can realize the fault recording function when needed, the voltage acquisition rate is greater than 0.5mS during recording, the recording time is greater than 60 seconds, and each path of voltage can record at least two groups of waveforms. This function requires the reservation of about 2000 x 2 x 60 x 8-4M RAM capacity.
And the MCU receives the instruction of the upper computer according to the appointed condition and judges whether the voltage acquisition channel carries out fault recording and broadcasting. The MCU selects main frequency 168M, the AD sampling rate can reach 1M/s at most, and the RAM with the sampling rate not less than 4M is expanded, so that fault data storage of 8 voltage acquisition channels is realized. And each fault channel records two groups of waveforms, wherein the recording time of each group of waveforms is 60 seconds, and the data sampling period is 0.5 ms. And updating the data downwards by adopting a floating data storage technology. And transmitting data according to a protocol in agreement through the CAN bus.
The system has a self-alarming function and mainly comprises an MCU (microprogrammed control Unit) restart alarm, a collection channel failure alarm, a module self working voltage and current monitoring, a watchdog restart alarm and the like. The number of self-fault alarms is required to reach more than 40 percent of the coverage rate of all faults. And MCU restart alarm and working voltage abnormal state self-checking alarm are realized by adopting methods such as cold and hot start judgment, PVD detection and the like. Two pieces of nonvolatile memories are designed in a redundancy mode to store module system data, and self-checking alarm of module internal data and memory failure alarm are achieved. The analog acquisition channel applies standard signal source excitation and working power supply range monitoring in a fixed period to realize acquisition channel failure alarm and working power supply abnormity alarm. And a special power management chip is adopted to realize module working voltage and current self-checking alarm. And the watchdog restarting alarm function is realized by watchdog reset detection, RAM mark data comparison and system reset state identification. The coverage rate of all faults can be more than 40 percent by counting the number of the fault alarm information which can be realized.
The power supply screen monitors to realize the monitoring of electric parameters such as power frequency voltage, current, power and the like of the three-phase four-wire system, can carry out logic judgment of instantaneous power failure, phase failure and wrong sequence, and stores an instantaneous power failure curve. Nearby installation, signal type: 50hz ac voltage/current. Monitoring the measuring range: voltage 0-300V (phase) and current 0-100A. Signal frequency: 40 to 65 Hz. Sampling period: 250 ms. Voltage: plus or minus 0.5 percent; current: plus or minus 1 percent; frequency: 0.1 Hz; phase angle: plus or minus 1 percent; power: plus or minus 1 percent. Logic standard: 1) instantaneous power failure: any phase voltage is lower than 65% of the rated value, the duration is between 40ms and 1000ms, and an instant power-off mark and a curve storage mark are set. 2) Phase loss: when a certain phase voltage is lower than 65% of a rated value and the duration time exceeds 1000ms, setting an open-phase mark; 3) and (3) staggering: when the included angle between any two phase voltages is < 120-30 degrees or >120 +30 degrees and the duration is more than 1.5s, the mark of the wrong sequence is placed. 4) And (4) curve storage: when any phase of the module is subjected to instantaneous power failure, a curve is recorded, the curve comprises the data of 0.5s of instantaneous power failure process before the instantaneous power failure occurs and 1s of data after the instantaneous power failure occurs, and one point is recorded every 10 ms. The module always stores the latest 4 sets of instantaneous power-off curves. 5) Mark removal: the marks of instantaneous power failure, phase failure and error sequence are automatically cleared after the normal state is recovered. The curve storage flag is cleared after the curve is read.
And acquiring the output voltage of the power supply screen, and acquiring the output voltage of 25Hz/50Hz and the direct-current output voltage. Centralized installation, monitoring signals: 25Hz/50HzAC voltage; a DC voltage. Monitoring the measuring range: see table 6 for details.
TABLE 6
| Measuring signals: voltage of | Range/V |
| AC380 | 0-500 |
| AC220 | 0-300 |
| AC110 | 0-200 |
| AC24 | 0-50 |
| AC12 | 0-30 |
| DC220 | 0-300 |
| DC24 | 0-50 |
| DC48 | 0-80 |
| DC12 | 0-30 |
| DC6 | 0-10 |
Signal frequency: 25Hz +/-3 Hz; 50Hz +/-10 Hz; and (6) DC.
Sampling period: 250 ms.
Acquisition precision: voltage: plus or minus 1 percent; frequency: 0.1 Hz.
And detecting the voltage and frequency of the phase-sensitive track circuit and an included angle between the seven-track signal and the voltage of the power supply screen. In a 25Hz phase sensitive track signal acquisition, the amplitude of a 50Hz interference signal is simultaneously detected. Digital filtering is adopted to realize signal separation of different frequencies, and a phase difference recursive algorithm is adopted to realize frequency and phase calculation. Centralized installation, monitoring signals: 25Hz ac voltage (including 50Hz interference signal), phase angle, frequency. Monitoring the measuring range: route 1: 0-110V; 2 nd to 8 th ways: 0 to 40V. Signal frequency: 25Hz + -3 Hz (containing a 50Hz interference signal). Sampling period: 500 ms. Acquisition precision: voltage: plus or minus 1 percent; frequency: 0.1 Hz; phase angle: plus or minus 1 percent.
The centralized frequency shift monitoring realizes the monitoring of the interval frequency shift voltage and current signals of the intra-station code, centralized insulation and centralized insulation-free automatic block system at the transmitting end and the receiving end. According to the frequency domain analysis theory of the signal, the control system is combined with the frequency spectrum distribution characteristics of the centralized frequency shift signal to realize the separation of mixed signals of interval frequency shift, the self-adaptive identification of a single frequency shift signal, the demodulation of a low-frequency carrier frequency signal and the monitoring of other characteristic parameters.
The voltage is monitored, and the voltage is monitored,
monitoring contents by a sending end: the existing frequency shift, ZPW2000 and UM71 frequency shift sending boxes work output voltage. Monitoring signals: an alternating current signal. The carrier frequency has the frequency shift of 450 and 950Hz and other modes of 1650 and 2650 Hz. Modulating the low frequency 3-35 HZ. The frequency offset is the frequency shift of 55Hz and other systems of 11 Hz. And (4) centralized installation. Monitoring parameters: voltage amplitude, frequency, etc. Detection precision: voltage + -1.0%, frequency + -0.1 Hz. Monitoring the measuring range: 0-300V. Sampling period: 250 ms.
Monitoring contents by a receiving end: the input voltage of the existing frequency shift receiver is limited, and the input and output voltages of frequency shift receiving boxes such as ZPW2000 and UM71 are input and output. Monitoring signals: an alternating current signal. The carrier frequency has the frequency shift of 450 and 950Hz and other modes of 1650 and 2650 Hz. Modulating the low frequency 3-35 HZ. The frequency offset is the frequency shift of 55Hz and other systems of 11 Hz. . The installation mode is as follows: and (4) installing nearby. Monitoring parameters: voltage amplitude, frequency, etc. Monitoring precision: voltage + -1.0%, frequency + -0.1 Hz. Monitoring the measuring range: the existing frequency shift of 0-5V is applied to other systems with the track-in of 0-7V and the track-out of 0-3V. Sampling period: 250 ms.
Current monitoring, monitoring content: the output voltage of the frequency shift sending boxes such as ZPW2000 and UM71 is existed. Monitoring signals: an alternating current signal. The carrier frequency has the frequency shift of 450 and 950Hz and other modes of 1650 and 2650 Hz. Modulating the low frequency 3-35 HZ. The frequency offset is the frequency shift of 55Hz and other systems of 11 Hz. The installation form is as follows: and (4) installing nearby. Monitoring parameters: the magnitude of the current. Monitoring precision: voltage ± 1.0%. Monitoring the measuring range: 0-1A. Sampling period: 250 ms.
Monitoring the interface voltage at the boundary of the disaster prevention system and the train control system by monitoring disaster prevention and foreign matter invasion. Monitoring signals: a DC voltage. The installation mode is as follows: and (4) centralized installation. And (3) measuring precision: plus or minus 0.5 percent. Sampling period: 250 ms. Monitoring the measuring range: 0-40V.
The station-to-station voltage monitoring monitors direct-current voltage of an inter-station (inter-field) connection line and inter-field connection voltage. Monitoring signals: a DC voltage. The installation mode is as follows: and (4) centralized installation. And (3) measuring precision: plus or minus 0.5 percent. Sampling period: 250 ms. Monitoring the measuring range: 0- + -200V. Function 31: and (5) monitoring a shielding door.
The shielding door can be monitored. Monitoring signals: DC voltage, voltage curve data. Sampling rate: 250ms (voltage), 10ms (curve). Monitoring the measuring range: 0-150V. A curve storage logic.
(ii) overlap region, for KMJ, GMJ controls acquisition of voltage overlap region. The sampling rate is not more than 20ms, and the recording time zone KMJ is 0.5S before the rising edge to 1S after the rising edge. And (5) completing curve acquisition and autonomously sending data.
And secondly, instantaneous power off, setting D15 bit of the switching value in the state (PDKJ control voltage instantaneous power off flag bit) under the condition that the PDKJ control voltage instantaneous power off time interval is more than 150ms and less than 250 ms.
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 (10)
1. A rail signal alternating current-direct current voltage acquisition system is characterized by comprising a display unit, a programming switch, a peripheral circuit, a signal conditioning unit, a gain adjusting unit, an analog signal acquisition unit, an A/D unit, a signal channel diagnosis unit, a switching value acquisition unit, an operation and control unit, a communication unit and interface protection;
the display unit, the programming switch and the peripheral circuit are respectively in data interaction with the operation and control unit, the communication unit is in data interaction with the operation and control unit, the interface protection is in data interaction with the communication unit, the analog signal acquisition unit, the gain adjustment unit, the signal conditioning unit, the A/D unit and the operation and control unit are sequentially in signal connection along a data transmission direction, the analog signal acquisition unit and the gain adjustment unit are respectively in signal connection with the operation and control unit along the data transmission direction, the signal channel diagnosis unit is in signal connection between the analog signal acquisition unit and the operation and control unit, and the switching value acquisition unit is used for transmitting data to the operation and control unit.
2. The system according to claim 1, further comprising a signal input terminal, wherein the signal input terminal transmits data to the analog signal acquisition unit, and the data at the signal input terminal comprises a switch indication voltage, a power panel voltage, an ac continuous rail voltage, a phase sensitive rail voltage, a semi-self-closing voltage, an inter-station contact voltage, and a disaster prevention voltage.
3. The system for collecting track signals alternating current and direct current voltages according to claim 2, wherein the data collection of the signal input end is a centralized collection mode, and the signal input end adaptively identifies alternating current signals or direct current signals.
4. The track signal AC/DC voltage acquisition system according to claim 1, further comprising a power module for powering the acquisition system.
5. The track signal alternating current-direct current voltage acquisition system according to claim 1, further comprising an online upgrade module, wherein the online upgrade module performs online upgrade through a CAN bus, and specifically comprises:
the upper computer sends a fixed command, the bus module is switched to a program upgrading state, the module enters the program upgrading state, the upper computer sends a data packet of an upgrading version program to the module, the module returns verification information after receiving all the data packets, and after the upper computer confirms that the data received by the module is correct, the upper computer sends a module resetting command, and the module runs a new program.
6. The system for acquiring the track signal alternating current and direct current voltage according to claim 1, further comprising an alarm function module, wherein the alarm function module comprises an MCU (microprogrammed control Unit) restart alarm, an acquisition channel failure alarm, a working voltage and current monitoring device and a watchdog restart alarm.
7. The rail signal alternating current-direct current voltage acquisition system according to claim 6, wherein a cold-hot start judgment and/or PVD detection is adopted to realize MCU restart alarm and working voltage abnormal state self-checking alarm, two nonvolatile memories are designed for redundancy to store module system data, module internal data self-checking alarm and memory failure alarm are realized, a standard signal source excitation is applied to an analog acquisition channel through a fixed period, working power supply range monitoring is realized to realize acquisition channel failure alarm and working power supply abnormal alarm, a special power supply management chip is adopted to realize module working voltage current self-checking alarm, watchdog reset detection, RAM mark data comparison and system reset state identification, and a watchdog restart alarm function is realized.
8. The system for acquiring the track signal alternating current and direct current voltage according to claim 1 is characterized in that an instruction of an upper computer is received according to an agreed condition, whether a voltage acquisition channel carries out fault recording and broadcasting is judged, main frequency 168M is selected, AD sampling rate CAN reach 1M/s at most, at least 4M of RAM is expanded, fault data storage of 8 paths of voltage acquisition channels is achieved, a floating data storage technology is adopted, data are updated downwards, and the data are transmitted according to an agreed protocol through a CAN bus.
9. The system according to claim 8, wherein each fault channel records two sets of waveforms, each set of waveforms records 60 seconds, and the data sampling period is 0.5 ms.
10. The track signal ac/dc voltage acquisition system of claim 1, wherein the acquisition system comprises an 18 digit decimal unique identification number.
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