CT-Link fault early warning system and early warning method based on high and low frequency vibration sensing array

Abstract

The invention provides a CT-Link fault early warning system and early warning method based on a high and low frequency vibration sensing array, and belongs to the technical field of equipment fault early warning. The early warning system comprises an acquisition unit and an electronic device in communication connection with the acquisition unit. The acquisition unit comprises a high-frequency vibration sensor, a low-frequency vibration sensor, a power supply module and a communication module; the high-frequency vibration sensor and the low-frequency vibration sensor are both fixedly arranged on CT-Link equipment to be detected; the high-frequency vibration sensor is used for acquiring vibration data of CT-Link equipment by acquiring acceleration data, and the low-frequency vibration sensor is used for acquiring inclination angle data of the CT-Link equipment by sensing a gravity vector; and the electronic equipment is used for evaluating a risk index of the equipment according to the vibration data and the inclination angle data, and sending out early warning information when the risk index exceeds a threshold value. According to the invention, high-frequency vibration and low-frequency inclination conditions of the equipment can be detected in real time for a long time, and early warning can be carried out on possible faults of the equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of equipment failure early warning, and in particular relates to a CT-Link fault early warning system and early warning method based on high and low frequency vibration sensor arrays. Background Art

[0002] In DC transmission systems, current transformers are the mainstream equipment for current measurement. Among them, CT-Link current transformers have been widely used due to their advantages such as good insulation, strong anti-electromagnetic ability, high precision, small size, light weight and wide frequency band.

[0003] In addition to the aging of internal lines, a large part of the causes of CT-Link device failures are due to external shocks and vibrations, which cause the interface or optical fiber of the CT-Link device to be damaged. Traditional troubleshooting often involves checking a series of devices on the link one by one after the CT-Link device has issued an alarm prompt such as invalid data. This is inefficient and cannot provide early warning to reduce the occurrence of failures.

[0004] Therefore, a method is needed to assess the risk of CT-Link equipment and provide early warning. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a CT-Link fault warning system and a warning method based on high and low frequency vibration sensor arrays in view of the deficiencies of the prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A CT-Link fault warning system based on a high and low frequency vibration sensor array comprises an acquisition unit and an electronic device in communication connection with the acquisition unit; the acquisition unit comprises a high frequency vibration sensor, a low frequency vibration sensor, a power module and a communication module; the high frequency vibration sensor and the low frequency vibration sensor are both fixedly arranged on a CT-Link device to be detected; the high frequency vibration sensor is used to obtain vibration data of the CT-Link device by acquiring acceleration data, and the low frequency vibration sensor is used to obtain inclination data of the CT-Link device by sensing a gravity vector; the electronic device is used to evaluate the risk index of the corresponding CT-Link device according to the vibration data and the inclination data, and to issue a warning message when the risk index exceeds a threshold.

[0007] Furthermore, the vibration data is a sampling sequence of a set of acceleration data; and the inclination data is the projection value of the gravity vector on the XYZ three axes at the current moment.

[0008] Furthermore, the high-frequency vibration sensor and the low-frequency vibration sensor are integrated into a sensor array.

[0009] Furthermore, the risk index is expressed as ,in is the weight coefficient of the tilt angle, is the weight coefficient of vibration amplitude, is the weight coefficient of the vibration frequency, D is the tilt angle of the CT-Link device, A is the vibration amplitude of the CT-Link device, and F is the vibration frequency of the CT-Link device. is the natural frequency of the CT-Link device.

[0010] Furthermore, the tilt angle ,in is the angle between the gravity vector and the XYZ axes at the current moment, It is the angle between the gravity vector and the XYZ axes in the initial state of the CT-Link device; , , , It is the projection value of the gravity vector collected by the low-frequency vibration sensor on the XYZ three axes.

[0011] Furthermore, the vibration amplitude and the vibration frequency are obtained by performing discrete Fourier transform on the vibration data.

[0012] A CT-Link fault warning method based on a high- and low-frequency vibration sensor array comprises: real-time acquisition of vibration data and inclination data of a CT-Link device; performing discrete Fourier transform on a sampling sequence of the vibration data to obtain a frequency domain sequence of the vibration data, and obtaining the vibration frequency and vibration amplitude of the CT-Link device according to the frequency domain sequence; obtaining the inclination angle of the CT-Link device according to the XYZ three-axis projection value of a gravity vector in the inclination data; obtaining a risk index according to the inclination angle, vibration frequency and vibration amplitude of the CT-Link device; and issuing a warning message if the risk index exceeds a set threshold.

[0013] Furthermore, the method for obtaining the frequency domain sequence of vibration data includes: sampling the sequence Perform N-point discrete Fourier transform to obtain the frequency domain sequence , , ; The sampling times corresponding to the data are ,in is the sampling frequency; frequency domain sequence The frequencies corresponding to the data are .

[0014] Furthermore, the method for obtaining the tilt angle of the CT-Link device includes: obtaining the projection value of the gravity vector on the XYZ axes at the current time t , then the angle between the gravity vector and the XYZ axes is expressed as , , , ; The tilt angle of the CT-Link device is , It is the angle between the gravity vector and the XYZ axes in the initial state of the CT-Link device.

[0015] Furthermore, the risk index is expressed as ,in is the weight coefficient of the tilt angle, is the weight coefficient of vibration amplitude, is the weight coefficient of the vibration frequency, D is the tilt angle of the CT-Link device, A is the vibration amplitude of the CT-Link device, and F is the vibration frequency of the CT-Link device. is the natural frequency of the CT-Link device.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes an early warning system and early warning method for CT-Link equipment failures caused by vibration and tilt, which can detect the high-frequency vibration and low-frequency tilt of the equipment in real time and for a long time, and warn of possible equipment failures, effectively improving the ability to predict and detect equipment failures. The present invention assesses the risk of failure in the environment where the equipment is located, giving managers the opportunity to prevent problems before they occur. At the same time, after the failure occurs, it effectively reminds maintenance personnel of the fault point, improves maintenance efficiency, and reduces production losses caused by equipment shutdowns required for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 : Schematic diagram of the present invention. DETAILED DESCRIPTION

[0019] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments and the accompanying drawings, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0020] Example 1: See Figure 1The purpose of this embodiment is to provide a CT-Link fault warning system based on high and low frequency vibration sensor arrays, including a collection unit and an electronic device connected to the collection unit for communication.

[0021] The acquisition unit includes a high-frequency vibration sensor, a low-frequency vibration sensor, a power module and a communication module. The high-frequency vibration sensor and the low-frequency vibration sensor are both fixedly arranged on the CT-Link device to be detected.

[0022] The high-frequency vibration sensor is used to obtain the vibration data of the CT-Link device by collecting acceleration data. Ideally, the high-frequency vibration sensor will output 0 when the CT-Link device is stationary, and the high-frequency vibration sensor will output the acceleration value of the current motion of the CT-Link device when the CT-Link device is vibrating, in units of .

[0023] The low-frequency vibration sensor is used to obtain the inclination data of the CT-Link device by sensing the gravity vector. The CT-Link device generally has a normal standard working state. When the device deviates from this state and tilts, the risk of many buckles and interfaces of the device loosening and falling off will increase. If the environmental vibration is superimposed at this time, the risk of failure will be even higher. The low-frequency vibration sensor itself has a three-dimensional Cartesian coordinate system, whose three axes are marked as XYZ. The low-frequency vibration sensor can obtain the projection value of the gravity vector on the XYZ three axes.

[0024] The high-frequency vibration sensor and the low-frequency vibration sensor are both electrically connected to the communication module, and are communicatively connected to the electronic device through the communication module; the power module provides power to the high-frequency vibration sensor, the low-frequency vibration sensor and the communication module.

[0025] Preferably, the high-frequency vibration sensor and the low-frequency vibration sensor are integrated to form a sensor array, and the two are integrated into the same electronic component or the same circuit board, and share a communication link to communicate with the electronic device. Multiple acquisition units can communicate with the same electronic device, and the electronic device can obtain sensor data from multiple acquisition units.

[0026] The electronic device can be a server, a desktop computer, a portable computer, an embedded device, etc., and can be set locally or in the cloud. The electronic device is used to evaluate the risk index of the corresponding CT-Link device according to the sensor data of the acquisition unit, and to provide fault warning for the CT-Link. Specifically, the electronic device is used to execute the fault warning method of the embodiment.

[0027] Example 2: See Figure 1 The purpose of this embodiment is to provide a CT-Link fault warning method based on a high and low frequency vibration sensor array, which is implemented using the warning system of embodiment 1. The method includes: S1. Collect vibration data and inclination data of CT-Link equipment in real time.

[0028] High-frequency vibration sensors are used to collect vibration data of CT-Link equipment in real time, and low-frequency vibration sensors are used to collect inclination data of CT-Link equipment in real time.

[0029] S2. Perform discrete Fourier transform on the sampling sequence of the vibration data to obtain the frequency domain sequence of the vibration data, and obtain the vibration frequency and vibration amplitude of the CT-Link device according to the frequency domain sequence.

[0030] The vibration data collected by the high-frequency vibration sensor is a sampling sequence of acceleration data. The sampling sequence is a time domain sequence. By performing N-point discrete Fourier transform processing on the sampling sequence, the frequency domain sequence of the vibration data can be obtained. , , , , is the sampling sequence. The sampling times corresponding to the data are ,in is the sampling frequency; frequency domain sequence The frequency interval of adjacent data in is ,Right now The frequencies corresponding to the data are .

[0031] By analyzing the frequency domain sequence of vibration data, the main forced vibration frequency components of the CT-Link device in the environment can be obtained, from which the vibration frequency F and vibration amplitude A can be obtained.

[0032] S3. Obtain the tilt angle of the CT-Link device according to the XYZ three-axis projection value of the gravity vector in the tilt angle data.

[0033] The inclination data is the projection value of the gravity vector on the XYZ three axes. The inclination data (i.e. the three-axis projection value) at sampling time t is expressed as ; The angle between the gravity vector and the XYZ axes is expressed as ,but , , .

[0034] After the initial installation of the low frequency vibration sensor, first obtain the initial and corresponding .

[0035] The tilt data of the CT-Link device compared to the initial state is , , , , tilt angle .

[0036] S4. Obtain a risk index based on the tilt angle, vibration frequency, and vibration amplitude of the CT-Link device.

[0037] Risk Index ,in is the weight coefficient of the tilt angle, is the weight coefficient of vibration amplitude, is the weight coefficient of the vibration frequency, D is the tilt angle of the CT-Link device, A is the vibration amplitude of the CT-Link device, and F is the vibration frequency of the CT-Link device. is the natural frequency of the CT-Link device.

[0038] The risk index is proportional to the tilt angle and vibration amplitude. At the same time, the closer the vibration frequency of the equipment is to the natural frequency, the greater the risk of resonance. Therefore, the risk index is inversely proportional to the difference between the vibration frequency and the natural frequency.

[0039] The natural frequency of the CT-Link device is obtained through experiments after the initial installation of the device.

[0040] S5. If the risk index exceeds the set threshold, a warning message will be issued.

[0041] When the risk index R is greater than the set threshold, an early warning message is issued. After receiving the early warning message, the equipment maintenance personnel will check the risks of the environment where the CT-Link equipment is located, including the vibration source and the reason for the equipment tilt, and take corresponding measures to reduce the probability of CT-Link equipment failure in the future. If a failure has already occurred, the equipment will be repaired.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A CT-Link fault warning system based on high and low frequency vibration sensor array, characterized in that: It includes a collection unit and an electronic device that is communicatively connected to the collection unit; The acquisition unit includes a high-frequency vibration sensor, a low-frequency vibration sensor, a power module and a communication module; the high-frequency vibration sensor and the low-frequency vibration sensor are both fixedly arranged on the CT-Link device to be detected; The high-frequency vibration sensor is used to obtain vibration data of the CT-Link device by collecting acceleration data, and the low-frequency vibration sensor is used to obtain inclination data of the CT-Link device by sensing the gravity vector; The electronic device is used to evaluate the risk index of the corresponding CT-Link device according to the vibration data and the inclination data, and to issue a warning message when the risk index exceeds a threshold value.

2. The CT-Link fault warning system based on high and low frequency vibration sensor array according to claim 1 is characterized in that: The vibration data is a sampling sequence of a set of acceleration data; the inclination data is the projection value of the gravity vector on the XYZ three axes at the current moment.

3. The CT-Link fault warning system based on high and low frequency vibration sensor array according to claim 1 is characterized in that: The high-frequency vibration sensor and the low-frequency vibration sensor are integrally arranged to form a sensor array.

4. The CT-Link fault warning system based on high and low frequency vibration sensor array according to claim 1 is characterized in that: The risk index is expressed as ,in is the weight coefficient of the tilt angle, is the weight coefficient of vibration amplitude, is the weight coefficient of the vibration frequency, D is the tilt angle of the CT-Link device, A is the vibration amplitude of the CT-Link device, and F is the vibration frequency of the CT-Link device. is the natural frequency of the CT-Link device.

5. The CT-Link fault warning system based on high and low frequency vibration sensor array according to claim 4 is characterized in that: The tilt angle ,in is the angle between the gravity vector and the XYZ axes at the current moment, It is the angle between the gravity vector and the XYZ axes in the initial state of the CT-Link device; , , , It is the projection value of the gravity vector collected by the low-frequency vibration sensor on the XYZ three axes.

6. The CT-Link fault warning system based on high and low frequency vibration sensor array according to claim 4 is characterized in that: The vibration amplitude and the vibration frequency are obtained by performing discrete Fourier transform on the vibration data.

7. A CT-Link fault warning method based on high and low frequency vibration sensor array, characterized in that: include: Collect vibration data and inclination data of CT-Link equipment in real time; Perform discrete Fourier transform on the sampling sequence of vibration data to obtain the frequency domain sequence of vibration data, and obtain the vibration frequency and vibration amplitude of the CT-Link device according to the frequency domain sequence; Obtain the tilt angle of the CT-Link device based on the XYZ three-axis projection value of the gravity vector in the tilt data; Obtain risk index based on the tilt angle, vibration frequency and vibration amplitude of the CT-Link device; If the risk index exceeds the set threshold, a warning message will be issued.

8. The CT-Link fault early warning method based on high and low frequency vibration sensor array according to claim 7 is characterized in that: The method for obtaining the frequency domain sequence of vibration data includes: Perform N-point discrete Fourier transform to obtain the frequency domain sequence , , ; The sampling times corresponding to the data are ,in is the sampling frequency; frequency domain sequence The frequencies corresponding to the data are .

9. The CT-Link fault early warning method based on high and low frequency vibration sensor array according to claim 7 is characterized in that: The method for obtaining the tilt angle of the CT-Link device includes: obtaining the projection value of the gravity vector on the XYZ axes at the current time t , then the angle between the gravity vector and the XYZ axes is expressed as , , , ; The tilt angle of the CT-Link device is , It is the angle between the gravity vector and the XYZ axes in the initial state of the CT-Link device.

10. The CT-Link fault early warning method based on high and low frequency vibration sensor array according to claim 7 is characterized in that: The risk index is expressed as ,in is the weight coefficient of the tilt angle, is the weight coefficient of vibration amplitude, is the weight coefficient of the vibration frequency, D is the tilt angle of the CT-Link device, A is the vibration amplitude of the CT-Link device, and F is the vibration frequency of the CT-Link device. is the natural frequency of the CT-Link device.

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