IEPE signal data acquisition card for monitoring transportation vibration in main transformer station

Abstract

The invention provides an IEPE signal data acquisition card for monitoring transportation vibration in a main transformer station, which is installed in the main transformer station and comprises an IEPE sensor unit, a signal conditioning circuit, a data acquisition circuit and a communication interface module which are connected in sequence, the IEPE sensor unit comprises at least one acceleration sensor; the signal conditioning circuit comprises an IEPE interface circuit and a filter circuit which are connected with each other. The data acquisition circuit comprises an ADC acquisition module and an FPGA main control circuit connected with the ADC acquisition module; the IEPE interface circuit is used for being connected with an IEPE sensor unit; related requirements of a vibration monitoring scene in a transportation process in a main transformer station can be effectively met; in addition, a low-cost and high-availability scheme can be provided for related equipment users, the autonomous controllable degree of related hardware is improved, the cost of signal acquisition is reduced, and possibility is provided for large-scale deployment of related technologies.

Description

Technical Field

[0001] The invention relates to the field of sensor electronic circuits, and in particular to an IEPE signal data acquisition card for transport vibration monitoring in a main transformer station. Background Art

[0002] During the transportation of the main transformer in the station, the main transformer will be subjected to various vibrations and shocks, which may cause damage to the insulation, coils, cores and other key components of the main transformer, affecting the safe operation of the main transformer. In order to monitor the vibration of the main transformer in real time during transportation, a high-precision and high-reliability vibration monitoring data acquisition device is required. However, the transportation environment in the main transformer station is harsh, with strong electromagnetic interference, high and low temperature alternation, etc., which puts high demands on the anti-interference ability and environmental adaptability of the vibration monitoring data acquisition device. At the same time, the vibration frequency range of the main transformer during transportation is wide and the amplitude is large, which also places high demands on the measurement range and sensitivity of the vibration monitoring data acquisition device. How to achieve high-precision and high-reliability acquisition of wide-band and large-amplitude vibration signals under the harsh transportation environment of the main transformer station is a technical problem that needs to be solved urgently.

[0003] China Electric Power Research Institute has carried out vibration monitoring work for simulated full-installation transportation of main equipment in UHV converter stations, and obtained a large amount of test data and results. However, the actual full-installation transportation process of UHV main transformers 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 multi-point vibration monitoring device and platform for full-installation transportation of UHV main transformers to ensure that substation operation and maintenance personnel can quickly and efficiently obtain the vibration conditions of the main transformer during full-installation transportation, thereby guiding the smooth and safe full-installation transportation process of UHV main transformers.

[0004] The current IEPE signal data acquisition card has the following problems: 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 main transformer station transportation vibration monitoring scenario; and the existing multi-channel data acquisition system is imported equipment with high cost; the system update, maintenance and upgrade cannot be achieved independently, which greatly limits the large-scale promotion and application of related technologies; In view of the above problems, the existing IEPE signal data acquisition card is difficult to meet the main transformer station transportation vibration monitoring requirements. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an IEPE signal data acquisition card for transport vibration monitoring in a main transformer station, comprising: an IEPE sensor unit, a signal conditioning circuit, a data acquisition circuit and a communication interface module connected in sequence;

[0006] The IEPE sensor unit includes at least one acceleration sensor for collecting vibration signals; the signal conditioning circuit includes an IEPE interface circuit and a filter circuit connected to each other; the data acquisition circuit includes an ADC acquisition module and an FPGA main control circuit connected to the ADC acquisition module;

[0007] The IEPE interface circuit is used to connect to the IEPE sensor unit; the ADC acquisition module is used to convert analog signals into digital signals and process them; and the communication interface module is connected to the cloud terminal for communication.

[0008] Preferably, the IEPE sensor unit includes a capacitive acceleration sensor or a chip-type three-axis accelerometer which serve as a primary and a backup for each other.

[0009] Preferably, the capacitive acceleration sensor adopts AKE390B-02; and the chip-type three-axis accelerometer adopts ADXL354.

[0010] Preferably, the ADC acquisition module includes 4 BNC interfaces, each of the BNC interfaces is correspondingly connected to one of the acceleration sensors, and the sampling accuracy of the ADC acquisition module is 24 bits.

[0011] Preferably, the signal conditioning circuit further comprises a constant current source module which is sequentially connected to the IEPE interface circuit and the filter circuit.

[0012] Preferably, the signal filtering circuit comprises a low-pass filter.

[0013] Preferably, the FPGA main control circuit includes an FPGA chip and a storage chip that are connected to each other.

[0014] Preferably, the FPGA chip model is PGL25G; the storage chip is GD25Q127C.

[0015] Preferably, the signal filtering circuit comprises an AC coupling circuit, an operational amplifier circuit, a second-order Butterworth low-pass filter and a voltage follower circuit which are connected in sequence.

[0016] Preferably, the acquisition card further comprises: a power supply module, and the power supply module is connected to the FPGA main control circuit, the communication interface module, the constant current source module and the filter circuit.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present application provides an IEPE signal data acquisition card for transport vibration monitoring in a main transformer station, which is installed in the main transformer station and includes: an IEPE sensor unit, a signal conditioning circuit, a data acquisition circuit and a communication interface module connected in sequence; the IEPE sensor unit includes at least one acceleration sensor; the signal conditioning circuit includes an IEPE interface circuit and a filter circuit connected to each other; the data acquisition circuit includes an ADC acquisition module and an FPGA main control circuit connected to the ADC acquisition module; the IEPE interface circuit is used to connect to the IEPE sensor unit; and can provide real-time IEPE sensor signal data of relevant measuring points during transportation in the main transformer station in real time;

[0019] 2. The IEPE signal data acquisition card for transport vibration monitoring in the main transformer station provided by this application is simple to install, deploy, upgrade and maintain, and has high reliability;

[0020] 3. The IEPE signal data acquisition card for transport vibration monitoring in the main transformer station provided by this application uses domestically produced chips, which reduces the cost to the greatest extent;

[0021] 4. The data acquisition circuit in the IEPE signal data acquisition card for transport vibration monitoring in the main transformer station provided by the present application has the function of local data storage;

[0022] 5. The communication interface module in the IEPE signal data acquisition card for transport vibration monitoring in the main transformer station provided by the present application is connected to the cloud terminal for communication and has the ability to upload online to the cloud terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an IEPE signal data acquisition card for in-station transportation of a main transformer substation of the present invention;

[0024] Figure 2 This is the schematic diagram of the signal conditioning circuit;

[0025] Figure 3 It is the schematic diagram of the amplifier circuit and ADC circuit-1;

[0026] Figure 4 It is the schematic diagram of the amplifier circuit and ADC circuit-2;

[0027] Figure 5 Design the schematic diagram for the FPGA main control circuit;

[0028] Figure 6 It is the external interface circuit schematic diagram-1;

[0029] Figure 7 This is the external interface circuit schematic diagram-2. DETAILED DESCRIPTION

[0030] In order to ensure that the basic functions and performance requirements of the IEPE signal data acquisition card used for in-station transportation of the main transformer substation are met, and at the same time, it can be promoted in a low-cost manner, an IEPE signal data acquisition card for in-station transportation vibration monitoring of the main transformer and a hardware design scheme for the main transformer vibration monitor are proposed. The patent application of the present invention takes the hardware design of the IEPE signal data acquisition card as the starting point. By using domestic FPGA chips and other components, it can not only effectively meet the relevant requirements of the vibration monitoring scenario during the in-station transportation of the main transformer; it can also provide low-cost and high-availability solutions for users of related equipment, while improving the degree of autonomy and controllability of related hardware, reducing the cost of signal acquisition, and providing the possibility for large-scale deployment of related technologies. In order to better understand the present invention, the contents of the present invention are further explained below in conjunction with the drawings and examples in the specification.

[0031] Embodiment 1:

[0032] like Figure 1 As shown, the patent application of the present invention discloses an IEPE signal data acquisition card for transport vibration monitoring in a main transformer station, including an IEPE sensor unit, a signal conditioning circuit, a data acquisition circuit and a communication interface module connected in sequence; the acquisition card also includes a power module connected to the FPGA main control circuit, the communication interface module, the constant current source module and the filter circuit. The acquisition card provided by the patent of 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.

[0033] The design of the IEPE signal data acquisition card for transport vibration monitoring in the main transformer station in this application mainly includes sensor selection and the design and implementation of several parts such as signal conditioning circuit, data acquisition circuit, and communication interface module.

[0034] 1. Sensor selection.

[0035] By comparing the commonly used vibration monitoring sensors on the market, this application selects a solution of two acceleration sensors, one main and one backup, namely, an independent capacitive acceleration sensor (AKE390B-02, which can measure the horizontal X and Y directions and the vertical direction, and the sensor's measurement frequency range is 0.1-500Hz) and a chip-type three-axis accelerometer (ADXL354, which can measure the horizontal X and Y directions and the vertical direction). This design has the following advantages:

[0036] (1) This type of sensor is easy to use, flexible, and particularly suitable for field testing and online monitoring;

[0037] (2) High accuracy;

[0038] (3) High reliability. Since two sets of acceleration sensors are used, one active and one standby, the acceleration measurement data can be mutually verified. In addition, when one set of sensors fails to work or works abnormally, the measurement data of the other set of sensors can still be used to provide real-time signals of the vibration of the entire transport.

[0039] 2. Signal conditioning circuit.

[0040] 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 in this application has high reliability and general performance. It is mainly composed of a constant current source module, an IEPE interface circuit and a filter circuit;

[0041] The signal filtering circuit in the application includes an AC coupling circuit, an operational amplifier circuit, a low-pass filtering circuit and a voltage follower circuit connected in sequence (see the principle block diagram of the conditioning circuit for details). Figure 2 ).

[0042] (1) AC coupling and operational amplifier circuits, such as Figure 3 and Figure 4 As shown;

[0043] (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 low-pass filter to perform anti-aliasing filtering on the signal, thereby improving the signal-to-noise ratio of the circuit. This application uses a second-order Butterworth filter with stable performance and easy gain adjustment.

[0044] A low-pass filter is a filter that allows low-frequency signals below the set cutoff frequency to pass through but 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;

[0045] (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.

[0046] 3. Data acquisition circuit.

[0047] The IEPE signal data acquisition card of this application uses GD25Q127C as the data storage chip and PGL25G programmable logic device as the FPGA main control circuit (a new low-power, low-cost FPGA product launched by Shenzhen Ziguang Tongchuang Electronics Co., Ltd.). See the schematic diagram of the FPGA main control circuit design for details. Figure 5 The external interface circuit principle is as shown in Figure 6 and Figure 7 The performance parameters of the main control chip involved in this patent are as follows:

[0048] -Support input and output registers

[0049] -Support 48bit accumulator

[0050] -Support "Signed" and "Unsigned" data operations

[0051] ●Integrated storage controller hard core

[0052] HMEMC-Supports DDR2, DDR3, LPDDR

[0053] - Single HMEMC supports x8, x16 data width

[0054] -Support standard AXI4 bus protocol

[0055] -Support DDR3 write leveling and DQS gate training

[0056] -DDR3 maximum speed up to 800Mbps

[0057] ●Integrated ADC hard core

[0058] -10-bit resolution, 1MSPS (independent ADC operation) sampling rate

[0059] - Up to 12 input channels

[0060] -Integrated temperature sensor

[0061] ●Rich clock resources

[0062] -Support 3 types of clock networks, flexible configuration

[0063] -Region-based global clock network

[0064] - Each zone has 4 zone clocks, supporting vertical cascading

[0065] - High-speed IO clock, support IO clock division

[0066] -Optional data address latch, output register

[0067] -Integrated multiple PLLs, each PLL supports up to 5 clock outputs

[0068] ●Flexible configuration

[0069] -Support multiple programming modes

[0070] -JTAG mode complies with IEEE1149 and IEEE1532 standards

[0071] -MasterSPI can select up to 8-bit data width, effectively improving programming speed

[0072] -Support BPIx8 / x16, Serialslave, Parallelslave modes

[0073] -Support AES-256 bit stream encryption(2), support 64bitUID protection

[0074] -Support SEU error detection and correction

[0075] -Support multi-version bitstream fallback function

[0076] -Support watchdog timeout detection

[0077] -Support programming download

[0078] -Support online debugging

[0079] 5. IEPE data acquisition refers to the acquisition of signals from an accelerometer (IEPE sensor) with a built-in charge amplifier or voltage amplifier. The IEPE sensor is a special sensor that integrates a piezoelectric sensor with a charge amplifier or voltage amplifier, and has excellent noise resistance and easy packaging. The acquisition card usually has a built-in constant current source and DC isolation circuit, which can directly drive the IEPE sensor and analyze and process the collected data. Figure 4 and Figure 5 shown.

[0080] IEPE data acquisition is widely used in acceleration detection, vibration detection, sound detection and other fields, such as bridge vibration monitoring, skyscraper vibration measurement, rail transit vibration detection, crane 3-axis vibration measurement, gantry crane monitoring, port lifting machinery, motor vibration, microphone audio measurement, wind power equipment vibration monitoring system, etc. When selecting IEPE data acquisition equipment, it is necessary to consider parameters such as the number of channels, sampling rate, accuracy, input range, etc. to meet specific application requirements. At the same time, it is also necessary to pay attention to the compatibility of the equipment to ensure that the selected equipment is compatible with the IEPE sensor used.

[0081] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0082] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0083] 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. An IEPE signal data acquisition card for transport vibration monitoring in main transformer stations, characterized in that: include: An IEPE sensor unit, a signal conditioning circuit, a data acquisition circuit and a communication interface module connected in sequence; The IEPE sensor unit includes at least one acceleration sensor for collecting vibration signals; the signal conditioning circuit includes an IEPE interface circuit and a filter circuit connected to each other; the data acquisition circuit includes an ADC acquisition module and an FPGA main control circuit connected to the ADC acquisition module; The IEPE interface circuit is used to connect to the IEPE sensor unit; the ADC acquisition module is used to convert analog signals into digital signals and process them; and the communication interface module is connected to the cloud terminal for communication.

2. The acquisition card according to claim 1, characterized in that: The IEPE sensor unit includes a capacitive acceleration sensor or a chip-type three-axis accelerometer which are mutually primary and backup.

3. The acquisition card as claimed in claim 2, characterized in that: The capacitive acceleration sensor adopts AKE390B-02; the chip-type three-axis accelerometer adopts ADXL354.

4. The acquisition card as claimed in claim 2, characterized in that: The ADC acquisition module includes 4 BNC interfaces, each of which is connected to a corresponding acceleration sensor, and the sampling accuracy of the ADC acquisition module is 24 bits.

5. The acquisition card as claimed in claim 1, characterized in that: The signal conditioning circuit also includes a constant current source module which is sequentially connected to the IEPE interface circuit and the filter circuit.

6. The device according to claim 1, characterized in that The signal filtering circuit includes a low pass filter.

7. The acquisition card as claimed in claim 1, characterized in that: The FPGA main control circuit includes an FPGA chip and a storage chip which are connected to each other.

8. The acquisition card as claimed in claim 7, characterized in that: The FPGA chip model is PGL25G; the memory chip is GD25Q127C.

9. The acquisition card as claimed in claim 1, characterized in that: The signal filtering circuit comprises an AC coupling circuit, an operational amplifier circuit, a second-order Butterworth low-pass filter and a voltage follower circuit which are connected in sequence.

10. The acquisition card according to claim 1, characterized in that: The acquisition card also includes: a power supply module, which is connected to the FPGA main control circuit, the communication interface module, the constant current source module and the filter circuit.

Images