Strain signal acquisition card of main transformer, signal acquisition method, equipment and medium

Abstract

The invention relates to a strain signal acquisition card, a signal acquisition method, equipment and a medium of a main transformer, and the strain signal acquisition card can effectively meet the related requirements of a strain monitoring scene in the transportation process (the root of a sleeve) of the main transformer in a station through a constant current source module, a plurality of strain gauge interfaces, a plurality of signal conditioning modules and a signal conversion module. Strain real-time signal data of related measuring points (mainly the root of a sleeve) in the transportation process in a main transformer station are provided in real time, meanwhile, the acquisition card is easy to install, deploy, upgrade and maintain, has high reliability and low cost, and has the capacity of locally storing data and uploading the data to a cloud terminal online.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid operation and maintenance, and in particular to a strain signal acquisition card, a signal acquisition method, a device and a medium for a main transformer. Background Art

[0002] Through the systematic implementation of the (bushing root) strain monitoring work for the simulated full-installation transportation of the main equipment of the UHV converter station, a large amount of test data and results have been obtained. However, the actual UHV main transformer full-installation transportation process is not completely consistent with the simulated working conditions, and with the extensive use of full-installation transportation technology in UHV converter stations, it is urgent to develop a universal and easy-to-deploy UHV main transformer full-installation transportation bushing root strain monitoring device and platform to ensure that the substation can quickly and efficiently obtain the (bushing root) strain signal of the main transformer during the full-installation transportation process, thereby guiding the smooth and safe full-installation transportation process of the UHV main transformer.

[0003] The current strain signal data acquisition card has the following problems:

[0004] The existing multi-channel data acquisition system (number of channels, power consumption, size, etc.) does not fully meet the requirements of the signal acquisition card for the strain monitoring scenario of the root of the transport bushing in the main transformer station. Summary of the invention

[0005] In order to solve the problem that the multi-channel data acquisition system in the prior art is not fully adapted to the strain monitoring scenario of the root of the transport casing in the main transformer station, the present invention provides a strain signal acquisition card for the main transformer, the strain signal acquisition card comprising: a constant current source module, a plurality of strain gauge interfaces, a plurality of signal conditioning modules and a signal conversion module, each strain gauge interface is connected to an external strain gauge for collecting strain signals, and the output end of the signal conversion module is connected to an external signal receiving device;

[0006] The constant current source module is respectively connected to the power interface of each strain gauge interface; the signal interface of each strain gauge interface is connected to the input end of the signal conditioning module corresponding to each strain gauge interface; the output end of each signal conditioning module is respectively connected to the input end of the signal conversion module;

[0007] The constant current source module is used to provide a constant current to the external strain gauge through the power interface of the strain gauge interface;

[0008] The signal conditioning module is used to receive and condition the strain signal collected by the external strain gauge;

[0009] The signal conversion module is used to convert the conditioned strain signal from an analog signal to a digital signal, and send the strain signal converted into a digital signal to an external signal receiving device.

[0010] Optionally, the signal conditioning module includes: an AC coupling operational amplifier circuit, a low-pass filter circuit and a voltage follower circuit;

[0011] The input end of the AC coupling operational amplifier circuit is connected to the signal interface of the strain gauge interface, and the output end of the AC coupling operational amplifier circuit is connected to the input end of the low-pass filter circuit; the output end of the low-pass filter circuit is connected to the input end of the voltage follower circuit; the output end of the voltage follower circuit is connected to the input end of the signal conversion module;

[0012] The AC coupling operational amplifier circuit is used to receive the strain signal collected by the external strain gauge through the signal interface of the strain gauge interface, and perform AC coupling amplification processing on the received strain signal;

[0013] The low-pass filter circuit is used to filter the strain signal after AC coupling amplification processing;

[0014] The voltage follower circuit is used to isolate the strain signal in the signal conditioning module from the strain signal in the signal conversion module.

[0015] Optionally, the AC coupling operational amplifier circuit comprises: an AC coupling operational amplifier, a first capacitor and a first resistor;

[0016] The negative input terminal of the AC coupling operational amplifier is connected to the output terminal of the AC coupling operational amplifier and the first end of the first resistor, the positive power supply terminal of the AC coupling operational amplifier is connected to the first end of the first capacitor, and the negative power supply terminal of the AC coupling operational amplifier and the second end of the first capacitor are grounded;

[0017] The positive input terminal of the AC coupling operational amplifier is connected to the signal interface of the strain gauge interface, and the second end of the first resistor is connected to the low-pass filter circuit.

[0018] Optionally, the low-pass filter circuit is a second-order Butterworth filter.

[0019] Optionally, the low-pass filter circuit comprises: a filter amplifier, a second capacitor, a third capacitor, a second resistor, a third resistor and a fourth resistor;

[0020] The positive input terminal of the filter amplifier is connected to the second resistor, the positive power supply terminal of the filter amplifier is connected to the second capacitor, the negative power supply terminal of the filter amplifier is connected to the third capacitor, the negative input terminal of the filter amplifier is connected to the first end of the third resistor, and the output terminal of the filter amplifier is connected to the first end of the fourth resistor;

[0021] The second end of the third resistor is connected to the AC coupling operational amplifier circuit, and the second end of the fourth resistor is connected to the voltage follower circuit.

[0022] Optionally, the voltage follower circuit comprises: a voltage follower amplifier and a fifth resistor;

[0023] The negative input terminal of the voltage follower amplifier is connected to the output terminal of the voltage follower amplifier and the first terminal of the fifth resistor;

[0024] The positive input terminal of the voltage follower amplifier is connected to the low-pass filter circuit, and the second end of the fifth resistor is connected to the input terminal of the signal conversion module.

[0025] Optionally, the signal conversion module includes: an analog-to-digital conversion chip, an output end of the analog-to-digital conversion chip is connected to an external signal receiving device;

[0026] The input end of the analog-to-digital conversion chip is connected to the output end of the signal conditioning module;

[0027] The analog-to-digital conversion chip is used to convert the strain signal processed by the signal conditioning module from an analog signal to a digital signal, and send the strain signal converted into a digital signal to an external signal receiving device.

[0028] Optionally, the signal conversion module further comprises: a data storage chip and a communication interface, wherein the communication interface is connected to an external signal receiving device;

[0029] The input end of the data storage chip is connected to the output end of the analog-to-digital conversion chip, and the output end of the data storage chip is connected to the communication interface;

[0030] The data storage chip is used to receive and store the strain signal converted into a digital signal sent by the analog-to-digital conversion chip, and send the strain signal converted into a digital signal to an external signal receiving device through the communication interface.

[0031] Optionally, the strain signal acquisition card further includes: a power module, an input end of the power module is connected to an external power supply device;

[0032] The output end of the power supply module is respectively connected to the constant current source module, the signal conditioning module and the signal conversion module;

[0033] The power supply module is used to supply power to the constant current source module, the signal conditioning module and the signal conversion module respectively.

[0034] Based on the same inventive concept, the present invention also provides a signal acquisition method, the method comprising:

[0035] Obtain the strain signal collected by the external strain gauge;

[0036] Conditioning the strain signal using an AC coupling operational amplifier circuit and a low-pass filter circuit;

[0037] converting the conditioned strain signal from an analog signal to a digital signal;

[0038] Stores and transmits strain signals converted into digital signals.

[0039] Based on the same inventive concept, the present application also provides a computing device, including: one or more processors;

[0040] a processor for executing one or more programs;

[0041] When the one or more programs are executed by the one or more processors, a signal acquisition method as described above is implemented.

[0042] Based on the same inventive concept, the present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed, a signal acquisition method as described above is implemented.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The present invention provides a strain signal acquisition card for a main transformer. The strain signal acquisition card can effectively meet the relevant requirements of the strain monitoring scene (the root of the bushing) during the transportation process of the main transformer station through a constant current source module, multiple strain gauge interfaces, multiple signal conditioning modules and a signal conversion module, and provide real-time strain signal data of relevant measuring points (mainly the root of the bushing) during the transportation process of the main transformer station. At the same time, the installation, deployment and upgrade maintenance of the acquisition card are simple, and the acquisition card has high reliability and low cost, and has the ability to store data locally and upload it online to a cloud terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of a strain signal acquisition card for a main transformer provided by the present invention;

[0046] Figure 2 Based on Figure 1 A schematic diagram of a strain signal acquisition card for a main transformer provided by the illustrated embodiment;

[0047] Figure 3 A schematic diagram of a signal conditioning module provided by the present invention;

[0048] Figure 4 Based on Figure 1 A schematic diagram of another strain signal acquisition card for a main transformer provided by the illustrated embodiment;

[0049] Figure 5 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0050] Figure 6 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0051] Figure 7 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0052] Figure 8 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0053] Fig. 9 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0054] Fig.10 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0055] Fig.11 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0056] Fig.12 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0057] Fig.13 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0058] Fig.14 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0059] Fig.15 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0060] Fig.16 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0061] Fig.17One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0062] Fig.18 One of the schematic diagrams of a strain signal acquisition card for in-station transportation of a main transformer substation provided by the present invention;

[0063] Fig.19 A block diagram of a computer device provided by the present invention. DETAILED DESCRIPTION

[0064] Embodiment 1:

[0065] Figure 1 A schematic diagram of a strain signal acquisition card for a main transformer provided by the present invention is shown in FIG. Figure 1 As shown, the strain signal acquisition card may include: a constant current source module 101, a plurality of strain gauge interfaces 102, a plurality of signal conditioning modules 103 and a signal conversion module 104, each strain gauge interface 102 may be connected to an external strain gauge for collecting strain signals, and the output end of the signal conversion module 104 may be connected to an external signal receiving device; the constant current source module 101 is respectively connected to the power interface of each strain gauge interface 102; the signal interface of each strain gauge interface 102 may be connected to the input end of the signal conditioning module 103 corresponding to each strain gauge interface 102; the output end of each signal conditioning module 103 is respectively connected to the input end of the signal conversion module 104; the constant current source module 101 may be used to provide a constant current to the external strain gauge through the power interface of the strain gauge interface 102; the signal conditioning module 103 may be used to receive and condition the strain signal collected by the external strain gauge; the signal conversion module 104 may be used to convert the conditioned strain signal from an analog signal to a digital signal, and send the strain signal converted into a digital signal to an external signal receiving device.

[0066] The constant current source module 101 can provide a stable constant current for the external strain gauge to ensure the stability and consistency of the strain signal obtained by each signal conditioning module 103 through the signal interface of the strain gauge interface 102 .

[0067] The working principle of the signal acquisition card is that the constant current source module 101 provides a stable constant current to the external strain gauge through the power interface of the strain gauge interface 102. When subjected to stress or stress deformation, the external strain gauge collects the strain signal by changing the resistance. The external strain gauge outputs the collected strain signal. The signal conditioning module 103 receives the strain signal output by the external strain gauge through the strain gauge interface 102 and conditions the received strain signal. The signal conversion module 104 converts the conditioned strain signal from an analog signal to a digital signal.

[0068] Figure 2 Based on Figure 1 The embodiment shown is a schematic diagram of a strain signal acquisition card for a main transformer, as shown in FIG. Figure 2 As shown, the signal conditioning module 103 may include: an AC coupling operational amplifier circuit 1031, a low-pass filter circuit 1032 and a voltage follower circuit 1033; the input end of the AC coupling operational amplifier circuit 1031 may be connected to the signal interface of the strain gauge interface 102, the output end of the AC coupling operational amplifier circuit 1031 may be connected to the input end of the low-pass filter circuit 1032; the output end of the low-pass filter circuit 1032 may be connected to the input end of the voltage follower circuit 1033; the output end of the voltage follower circuit 103 ... low-pass filter circuit 1032 may be connected to the input end of the voltage follower circuit 1033; the output end of the low-pass filter circuit 1032 may be connected to the input end of the voltage follower circuit 1033; the output end of the low-pass filter circuit 1032 may be connected to the input The output end can be connected to the input end of the signal conversion module 104; the AC coupling operational amplifier circuit 1031 can be used to receive the strain signal collected by the external strain gauge through the signal interface of the strain gauge interface 102, and perform AC coupling amplification processing on the received strain signal; the low-pass filter circuit 1032 can be used to filter the strain signal after the AC coupling amplification processing; the voltage tracking circuit 1033 can be used to isolate the strain signal in the signal conditioning module 103 and the strain signal in the signal conversion module 104.

[0069] The low-pass filter circuit 1032 may be a second-order Butterworth filter, or a second-order low-pass filter or a Chebyshev filter.

[0070] It should be noted that the AC coupling operational amplifier circuit 1031 isolates the DC component in the strain signal received through the signal interface of the strain gauge interface 102, retains the AC component in the strain signal, performs AC coupling on the strain signal, and amplifies the strain signal after AC coupling. The low-pass filter circuit 1032 can filter the strain signal after AC coupling amplification by attenuating the high-frequency signal, so that the low-frequency signal is retained in the strain signal. The strain signal with the retained low-frequency signal is output through the voltage tracking circuit 1033, and the strain signal in the signal conditioning module 103 and the strain signal in the signal conversion module 104 are isolated to prevent the strain signal in the signal conditioning module 103 from being affected by the strain signal in the signal conversion module 104. The high-frequency signal and the low-frequency signal are determined according to the actual application scenario of the strain signal acquisition card. For example, if the application scenario of the strain signal acquisition card requires the acquisition signal frequency to be lower than 20kHz, the frequency less than 20kHz can be used as the low-frequency signal, and the frequency greater than or equal to 20kHz can be used as the high-frequency signal.

[0071] Figure 3 A schematic diagram of a signal conditioning module provided by the present invention is shown in FIG. Figure 3As shown, the AC coupling operational amplifier circuit 1031 may include: an AC coupling operational amplifier U1, a first capacitor C1 and a first resistor R1; the negative input terminal of the AC coupling operational amplifier U1 may be connected to the output terminal of the AC coupling operational amplifier U1 and the first end of the first resistor R1, the positive power supply terminal of the AC coupling operational amplifier U1 may be connected to the first end of the first capacitor C1, and the negative power supply terminal of the AC coupling operational amplifier U1 and the second end of the first capacitor C1 are grounded; the positive input terminal of the AC coupling operational amplifier U1 may be connected to the signal interface of the strain gauge interface 102, and the second end of the first resistor R1 may be connected to the low-pass filter circuit 1032.

[0072] The AC coupling operational amplifier circuit 1031 may further include: a pull-up resistor, a first end of the pull-up resistor connected to an external pull-up power supply, and a second end of the pull-up resistor connected to the output end of the AC coupling operational amplifier U1 and the first end of the first resistor R1.

[0073] Optionally, Figure 3 For example, the low-pass filter circuit 1032 may include: a filter amplifier U2, a second capacitor C2, a third capacitor C3, a second resistor R2, a third resistor R3 and a fourth resistor R4; the positive input terminal of the filter amplifier U2 can be connected to the second resistor R2, the positive power supply terminal of the filter amplifier U2 can be connected to the second capacitor C2, the negative power supply terminal of the filter amplifier U2 can be connected to the third capacitor C3, the negative input terminal of the filter amplifier U2 is connected to the first end of the third resistor R3, and the output terminal of the filter amplifier U2 can be connected to the first end of the fourth resistor; the second end of the third resistor R3 can be connected to the AC coupling operational amplifier circuit 1031, and the second end of the fourth resistor R4 can be connected to the voltage following circuit 1033.

[0074] Among them, the signal conditioning module 103 needs to suppress noise and interference within a certain frequency range, and use a suitable filter to perform anti-mixing filtering on the signal, thereby improving the signal-to-noise ratio of the circuit. The present invention uses a second-order Butterworth filter with stable performance and easy gain adjustment. A low-pass filter refers to a filter that allows low-frequency signals below a set cutoff frequency to pass and filters out signals that exceed the cutoff frequency. In order to make the filter characteristics closer to the ideal state, a second-order low-pass filter or a second-order Butterworth low-pass filter circuit is usually used.

[0075] Optionally, Figure 3For example, the voltage following circuit 1033 may include: a voltage following amplifier U3 and a fifth resistor; the negative input terminal of the voltage following amplifier U3 may be connected to the output terminal of the voltage following amplifier U3 and the first end of the fifth resistor R5; the positive input terminal of the voltage following amplifier U3 may be connected to the low-pass filter circuit 1032, and the second end of the fifth resistor R5 may be connected to the input terminal of the signal conversion module 104.

[0076] Among them, the input impedance of the voltage follower 1033 is high and the output impedance is low, which is equivalent to opening the front-stage circuit, and its output voltage is not affected by the impedance of the rear stage, so that the front-stage circuit and the rear-stage circuit do not affect each other, and can play a role in buffering, isolation, and improving load capacity. The voltage follower 1033 can also include: a first diode, a second diode and a bypass capacitor, the cathode of the first diode is used as a free end to connect an external device, the anode of the first diode is connected to the cathode of the second diode, the second end of the fifth resistor R5, the input end of the signal conversion module 104 and the first end of the bypass capacitor, and the anode of the second diode and the second end of the bypass capacitor are grounded.

[0077] Figure 4 Based on Figure 1 The embodiment shown is a schematic diagram of another strain signal acquisition card for the main transformer, as shown in FIG. Figure 4 As shown, the signal conversion module 104 may include: an analog-to-digital conversion chip 1041, the output end of the analog-to-digital conversion chip 1041 is connected to an external signal receiving device; the input end of the analog-to-digital conversion chip 1041 can be connected to the output end of the signal conditioning module 103; the analog-to-digital conversion chip 1041 can be used to convert the strain signal processed by the signal conditioning module 103 from an analog signal to a digital signal, and send the strain signal converted into a digital signal to an external signal receiving device.

[0078] Among them, the analog-to-digital conversion chip 1041 can be an ADS series (such as ADS1248, ADS1240 or ADS1115, etc.), an AD series (such as AD7793, AD7606 or AD7616, etc.) or a CS series (such as CS1180, CS1231 or CS1242, etc.).

[0079] Optionally, Figure 4For example, the signal conversion module 104 may also include: a data storage chip 1042 and a communication interface 1043, the communication interface 1043 can be connected to an external signal receiving device; the input end of the data storage chip 1042 can be connected to the output end of the analog-to-digital conversion chip 1041, and the output end of the data storage chip 1042 can be connected to the communication interface 1043; the data storage chip 1043 can be used to receive and store the strain signal converted into a digital signal sent by the analog-to-digital conversion chip 1041, and send the strain signal converted into a digital signal to an external signal receiving device through the communication interface 1042.

[0080] Among them, the data storage chip 1042 can use GD25Q127C, can use PGL25G programmable logic device, and can also use GD25Q128D, GD25Q256D or W25Q128F, etc.

[0081] Optionally, the strain signal acquisition card may further include: a power supply module, the input end of the power supply module is connected to an external power supply device; the output end of the power supply module is respectively connected to the constant current source module 101, the signal conditioning module 103 and the signal conversion module 104; the power supply module is used to supply power to the constant current source module 101, the signal conditioning module 103 and the signal conversion module 104 respectively.

[0082] Embodiment 2:

[0083] The current strain signal data acquisition card has the following problems:

[0084] (1) Existing multi-channel data acquisition systems are mainly imported, and the core software and hardware development technology is not mastered. Subsequent system updates, maintenance and upgrades are subject to others and are costly, which greatly limits the large-scale promotion and application of related technologies;

[0085] (2) The existing multi-channel data acquisition system (number of channels, power consumption, size, etc.) does not fully meet the requirements of the signal acquisition card for the strain monitoring scenario of the root of the transport bushing in the main transformer station.

[0086] In view of the above problems, the existing strain signal data acquisition card is difficult to meet the requirements of strain monitoring of the root of the casing transported in the main transformer station. Therefore, it is necessary to develop a strain signal data acquisition card specifically for the transportation in the main transformer substation. The present invention takes the hardware design of the strain signal data acquisition card as the starting point, and by using domestic FPGA chips and other components, it reduces the cost of signal acquisition while improving the degree of autonomy and controllability of related hardware.

[0087] In order to ensure that the basic functions and performance requirements of the strain signal data acquisition card used for transportation within the main transformer substation are met, and at the same time, it can be promoted in a low-cost manner, the present invention proposes a hardware design scheme for the main transformer bushing root strain monitor to achieve the following purposes:

[0088] 1. It can provide real-time strain signal data of relevant measuring points (mainly the root of the bushing) during the transportation of the main transformer station;

[0089] 2. The system installation, deployment, upgrade and maintenance are simple and highly reliable;

[0090] 3. Low cost, with the ability to store data locally and upload it online to the cloud terminal.

[0091] refer to Figure 5-Figure 17 The present invention discloses a strain signal acquisition card for transportation within a main transformer substation, the acquisition card comprises a constant current source module, an interface for connecting to a strain gauge, a filter circuit, an ADC acquisition module, an FPGA and a communication interface connected in sequence, the acquisition card also comprises a power module, the power module is connected to the FPGA, the communication interface, the constant current source module and the filter circuit. The acquisition card provided by the present invention can conveniently connect the collected data to the data acquisition system chassis through a dedicated interface, and has the advantages of small size and convenient data transmission.

[0092] The design provides a strain signal acquisition card for transportation within the main transformer substation, which includes signal conditioning circuit, data acquisition circuit and communication module.

[0093] 1. Signal conditioning circuit. The signal conditioning circuit of the system provides the excitation source for the sensor and pre-processes the sensor signal. Its performance directly determines the overall measurement accuracy and system reliability of the data acquisition system. The sensor signal conditioning circuit designed by this patent has high reliability and universal performance. It is mainly composed of a constant current source, an AC coupling circuit, an operational amplifier circuit, a low-pass filter circuit, a voltage follower circuit, etc. (See the principle block diagram of the conditioning circuit for details.) Fig.18 ).

[0094] (1) AC coupling and operational amplifier circuit;

[0095] (2) Schematic diagram of low-pass filter circuit. The signal conditioning circuit needs to suppress noise and interference within a certain frequency range and use a suitable filter to perform anti-aliasing filtering on the signal, thereby improving the signal-to-noise ratio of the circuit. This patent uses a second-order Butterworth filter with stable performance and easy gain adjustment.

[0096] Among them, a low-pass filter refers to a filter that allows low-frequency signals below the set cutoff frequency to pass through and filters out signals that exceed the cutoff frequency. In order to make the filter characteristics closer to the ideal state, a second-order low-pass filter is usually used. Finally, the designed filter circuit is determined to be a second-order Butterworth low-pass filter circuit;

[0097] (3) Schematic diagram of voltage follower circuit. The voltage follower has high input impedance and low output impedance, which is equivalent to an open circuit for the previous stage circuit. Its output voltage is not affected by the impedance of the next stage circuit, so that the previous and next stage circuits do not affect each other, and can play the role of buffering, isolation, and improving load carrying capacity.

[0098] 2. Data acquisition circuit. This patent involves a strain signal acquisition card for in-station transportation of main transformer substations, which uses GD25Q127C as the data storage chip and PGL25G programmable logic device. It is a new low-power, low-cost FPGA product launched by Shenzhen Ziguang Tongchuang Electronics Co., Ltd. The FPGA main control circuit design schematic is attached. Figure 1 The performance parameters of the main control chip involved in this patent are as follows:

[0099] -Support input and output registers

[0100] -Support 48bit accumulator

[0101] -Support "Signed" and "Unsigned" data operations

[0102] ●Integrated memory controller hard core HMEMC

[0103] -Support DDR2, DDR3, LPDDR

[0104] - Single HMEMC supports x8, x16 data width

[0105] -Support standard AXI4 bus protocol

[0106] -Support DDR3 write leveling and DQS gate training

[0107] -DDR3 maximum speed up to 800Mbps

[0108] ●Integrated ADC hard core

[0109] -10-bit resolution, 1MSPS (independent ADC operation) sampling rate

[0110] - Up to 12 input channels

[0111] -Integrated temperature sensor

[0112] ●Rich clock resources

[0113] -Support 3 types of clock networks, flexible configuration

[0114] -Region-based global clock network

[0115] - Each zone has 4 zone clocks, supporting vertical cascading

[0116] - High-speed IO clock, support IO clock division

[0117] -Optional data address latch, output register

[0118] -Integrated multiple PLLs, each PLL supports up to 5 clock outputs

[0119] ●Flexible configuration

[0120] -Support multiple programming modes

[0121] -JTAG mode complies with IEEE1149 and IEEE1532 standards

[0122] -MasterSPI can select up to 8-bit data width, effectively improving programming speed

[0123] -Support BPIx8 / x16, Serial slave, Parallel slave modes

[0124] -Support AES-256 bit stream encryption(2), support 64bit UID protection

[0125] -Support SEU error detection and correction

[0126] -Support multi-version bitstream fallback function

[0127] -Support watchdog timeout detection

[0128] -Support programming download

[0129] -Support online debugging

[0130] 3. Strain data acquisition refers to the acquisition of strain signals with built-in charge amplifiers or voltage amplifiers. IEPE sensor is a special sensor that integrates piezoelectric sensor with charge amplifier or voltage amplifier. It has excellent noise resistance and easy packaging, and analyzes and processes the collected data.

[0131] The strain signal acquisition card for in-station transportation of main transformer substations of the present invention can effectively meet the relevant requirements of the strain monitoring scenario (casing root) during in-station transportation of main transformers. It can provide low-cost and high-availability solutions for users of related equipment and make large-scale deployment of related technologies possible.

[0132] The present invention relates to a strain signal acquisition card for in-station transportation of a main transformer substation. The scheme is composed of an FPGA main control circuit, a signal conditioning circuit, a data acquisition circuit, a power management module and the like.

[0133] Among them, the conditioning circuit adopts AC coupling, low-pass filtering, operational amplification, voltage following and other means to greatly improve the signal-to-noise ratio of the signal, and further improves the reliability of the system and the accuracy of real-time monitoring data. The present invention relates to a strain signal acquisition card for in-station transportation of main transformer substations, which is directly equipped with constant current source excitation. A single strain signal acquisition card can simultaneously acquire strain signals of 8 strain gauges (a single-channel strain gauge requires 3 pins, a total of 24 pins), 24-bit ADC sampling accuracy, and a single-channel data rate of up to 512kSPS. The present invention relates to a strain signal acquisition card for in-station transportation of main transformer substations, including: the chip model of the FPGA is PGL25G, and the storage chip is GD25Q127C.

[0134] Embodiment 3:

[0135] Based on the same inventive concept, the present invention also provides a signal acquisition method, the method comprising:

[0136] Obtain the strain signal collected by the external strain gauge;

[0137] Conditioning the strain signal using an AC coupling operational amplifier circuit and a low-pass filter circuit;

[0138] converting the conditioned strain signal from an analog signal to a digital signal;

[0139] Stores and transmits strain signals converted into digital signals.

[0140] Embodiment 4:

[0141] Based on the same inventive concept, the present invention also provides a computer device, such as Fig.19 As shown, the computer device includes a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits, or other processors.

[0142] (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, and are suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of a signal acquisition method in the above embodiment.

[0143] Embodiment 5:

[0144] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a signal acquisition method in the above embodiment.

[0145] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0146] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0147] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0148] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0149] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A strain signal acquisition card for a main transformer, characterized in that: The strain signal acquisition card includes: a constant current source module, a plurality of strain gauge interfaces, a plurality of signal conditioning modules and a signal conversion module, each strain gauge interface is connected to an external strain gauge for collecting strain signals, and the output end of the signal conversion module is connected to an external signal receiving device; The constant current source module is respectively connected to the power interface of each strain gauge interface; the signal interface of each strain gauge interface is connected to the input end of the signal conditioning module corresponding to each strain gauge interface; the output end of each signal conditioning module is respectively connected to the input end of the signal conversion module; The constant current source module is used to provide a constant current to the external strain gauge through the power interface of the strain gauge interface; The signal conditioning module is used to receive and condition the strain signal collected by the external strain gauge; The signal conversion module is used to convert the conditioned strain signal from an analog signal to a digital signal, and send the strain signal converted into a digital signal to an external signal receiving device.

2. The strain signal acquisition card according to claim 1, characterized in that: The signal conditioning module includes: an AC coupling operational amplifier circuit, a low-pass filter circuit and a voltage follower circuit; The input end of the AC coupling operational amplifier circuit is connected to the signal interface of the strain gauge interface, and the output end of the AC coupling operational amplifier circuit is connected to the input end of the low-pass filter circuit; the output end of the low-pass filter circuit is connected to the input end of the voltage follower circuit; the output end of the voltage follower circuit is connected to the input end of the signal conversion module; The AC coupling operational amplifier circuit is used to receive the strain signal collected by the external strain gauge through the signal interface of the strain gauge interface, and perform AC coupling amplification processing on the received strain signal; The low-pass filter circuit is used to filter the strain signal after AC coupling amplification processing; The voltage follower circuit is used to isolate the strain signal in the signal conditioning module from the strain signal in the signal conversion module.

3. The strain signal acquisition card according to claim 2, characterized in that: The AC coupling operational amplifier circuit comprises: an AC coupling operational amplifier, a first capacitor and a first resistor; The negative input terminal of the AC coupling operational amplifier is connected to the output terminal of the AC coupling operational amplifier and the first end of the first resistor, the positive power supply terminal of the AC coupling operational amplifier is connected to the first end of the first capacitor, and the negative power supply terminal of the AC coupling operational amplifier and the second end of the first capacitor are grounded; The positive input terminal of the AC coupling operational amplifier is connected to the signal interface of the strain gauge interface, and the second end of the first resistor is connected to the low-pass filter circuit.

4. The strain signal acquisition card according to claim 2, characterized in that: The low-pass filter circuit is a second-order Butterworth filter.

5. The strain signal acquisition card according to claim 4, characterized in that: The low-pass filter circuit comprises: a filter amplifier, a second capacitor, a third capacitor, a second resistor, a third resistor and a fourth resistor; The positive input terminal of the filter amplifier is connected to the second resistor, the positive power supply terminal of the filter amplifier is connected to the second capacitor, the negative power supply terminal of the filter amplifier is connected to the third capacitor, the negative input terminal of the filter amplifier is connected to the first end of the third resistor, and the output terminal of the filter amplifier is connected to the first end of the fourth resistor; The second end of the third resistor is connected to the AC coupling operational amplifier circuit, and the second end of the fourth resistor is connected to the voltage follower circuit.

6. The strain signal acquisition card according to claim 2, characterized in that: The voltage following circuit comprises: a voltage following amplifier and a fifth resistor; The negative input terminal of the voltage follower amplifier is connected to the output terminal of the voltage follower amplifier and the first terminal of the fifth resistor; The positive input terminal of the voltage follower amplifier is connected to the low-pass filter circuit, and the second end of the fifth resistor is connected to the input terminal of the signal conversion module.

7. The strain signal acquisition card according to any one of claims 1 to 6, characterized in that: The signal conversion module includes: an analog-to-digital conversion chip, the output end of which is connected to an external signal receiving device; The input end of the analog-to-digital conversion chip is connected to the output end of the signal conditioning module; The analog-to-digital conversion chip is used to convert the strain signal processed by the signal conditioning module from an analog signal to a digital signal, and send the strain signal converted into a digital signal to an external signal receiving device.

8. The strain signal acquisition card according to claim 7, characterized in that: The signal conversion module also includes: a data storage chip and a communication interface, wherein the communication interface is connected to an external signal receiving device; The input end of the data storage chip is connected to the output end of the analog-to-digital conversion chip, and the output end of the data storage chip is connected to the communication interface; The data storage chip is used to receive and store the strain signal converted into a digital signal sent by the analog-to-digital conversion chip, and send the strain signal converted into a digital signal to an external signal receiving device through the communication interface.

9. The strain signal acquisition card according to claim 1, characterized in that: The strain signal acquisition card further includes: a power module, an input end of which is connected to an external power supply device; The output end of the power supply module is respectively connected to the constant current source module, the signal conditioning module and the signal conversion module; The power supply module is used to supply power to the constant current source module, the signal conditioning module and the signal conversion module respectively.

10. A signal acquisition method, characterized in that: The method comprises: Obtain the strain signal collected by the external strain gauge; Conditioning the strain signal using an AC coupling operational amplifier circuit and a low-pass filter circuit; converting the conditioned strain signal from an analog signal to a digital signal; Stores and transmits strain signals converted into digital signals.

11. A computer device, characterized in that: include: one or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, the signal acquisition method according to claim 10 is implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the signal acquisition method as claimed in claim 10 is implemented.

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