Line acoustic-magnetic intelligent diagnosis comprehensive monitoring device

Abstract

The utility model provides a line acoustic-magnetic intelligent diagnosis comprehensive monitoring device, which is applied to the technical field of power transmission line monitoring and comprises a solar energy storage module, a power management module, an ultrasonic signal acquisition module, a core processing module and a remote communication module, the power management module is connected with the solar energy storage module to form a power supply system; the ultrasonic signal acquisition module comprises an ultrasonic probe and a conditioning circuit, the ultrasonic probe is used for monitoring full-band ultrasonic signals, and the conditioning circuit is used for performing frequency selection on the acquired ultrasonic signals; the conditioning circuit comprises an amplifier U1 and an amplifier U2. Ultrasonic signals are collected in real time through the ultrasonic probe, the ultrasonic signals are amplified and subjected to frequency selection through the conditioning circuit, autonomous power supply and remote communication are achieved, and the accuracy of line monitoring and the sensitivity of signal monitoring are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power transmission line monitoring technical field, concretely relates to a line sound magnetism intelligent diagnosis comprehensive monitoring device. BACKGROUND

[0002] Power transmission and distribution network power line refers to the process that the electric energy generated by power plant is transmitted through power transmission line, then is transformed, distributed and controlled through the transformer substation, and finally is supplied to users. Power transmission usually adopts high-voltage alternating current (AC) or direct current (DC) transmission line to reduce power loss and transmission distance limit. These power transmission lines are usually composed of electric towers or cables, and can transmit electric energy from power plants to various geographical areas across hundreds to thousands of kilometers.

[0003] Power transmission and distribution network power lines are distributed throughout the country. Due to the influence of operating environment, device quality difference, external weather and other operating conditions, before the real fault occurs in the line, a small discharge signal will often start and gradually evolve into a real fault. For line monitoring problems, the following methods are mostly used in the prior art:

[0004] (1) Regularly check the line by portable device. This method not only occupies a large amount of human resources, but also has a large hysteresis, cannot realize real-time monitoring, and has safety hazards.

[0005] (2) Inject ultrasonic signal for detection after the line is powered off. This method requires that the line must be in a powered-off state, but the power transmission line cannot be powered off for a long time, and there is a problem of implementation difficulty. This method is suitable for injecting signal for fault positioning after the line is powered off due to fault, but is not suitable for line monitoring and early warning. INVENTION CONTENTS

[0006] In view of the above problems in the prior art, the purpose of the utility model is to provide a line sound magnetism intelligent diagnosis comprehensive monitoring device, which realizes autonomous power supply and remote communication by amplifying and selecting frequency of ultrasonic signal through an ultrasonic probe and a conditioning circuit, and improves the accuracy of line monitoring and the sensitivity of signal monitoring.

[0007] The utility model relates to a kind of line acoustic magnetic intelligent diagnosis comprehensive monitoring device, including solar energy storage module, power management module, ultrasonic signal acquisition module, core processing module and remote communication module, the core processing module is connected with ultrasonic signal acquisition module, remote communication module respectively, for realizing the collection of ultrasonic signal, data conversion and information transmission, the power management module is connected with solar energy storage module and forms power supply system, provides stable voltage for load;The ultrasonic signal acquisition module includes ultrasonic probe and conditioning circuit, and the ultrasonic probe is used to monitor full-band ultrasonic signal, and conditioning circuit is used to carry out frequency selection to the ultrasonic signal collected;The conditioning circuit includes amplifier U1 and amplifier U2, and the amplifier U1 is used for ultrasonic signal amplification, and the amplifier U2 is used for ultrasonic signal frequency selection.

[0008] Preferably, the amplifier U1 is connected with voltage division network and gain setting network, the voltage division network is used to adjust the size of input signal, and the gain setting network is used to adjust the amplification parameter of amplifier U1;The ultrasonic signal collected by the ultrasonic probe is accessed to conditioning circuit through VIN terminal point, and the ultrasonic signal is accessed to the positive input end of amplifier U1 after passing through voltage division network, the gain setting network is connected with the negative input end and feedback end of amplifier U1, and the output end of amplifier U1 is used to output amplified ultrasonic signal.

[0009] Preferably, the output end of amplifier U1 is connected with filter network, and the filter network includes capacitor C5, capacitor C7, resistor R5 and resistor R6, capacitor C5, capacitor C7 and resistor R6 are connected in series, the common end of capacitor C5 and resistor R6 is connected with the output end of amplifier U1, the output end of amplifier U1 is connected with resistor R5, the other end of resistor R5 is grounded, the end of capacitor C5 away from resistor R6 is accessed to the IN+ pin of amplifier U2, the end of capacitor C7 away from resistor R6 is accessed to the IN- pin of amplifier U2, and the OUT pin of amplifier U2 is connected with capacitor C6 to output conditioned ultrasonic signal.

[0010] Preferably, the bandwidth range of the conditioned ultrasonic signal output by amplifier U2 is 20kHz to 500kHz.

[0011] Preferably, the solar energy storage module includes solar cell panel and battery BAT, and the battery management module is connected with solar cell panel and battery BAT respectively.

[0012] Preferably, the core processing module is used to convert ultrasonic analog signal transmitted by ultrasonic signal acquisition module into digital signal and store.

[0013] Preferably, the core processing module is used to control remote communication module, realizes the periodic report of ultrasonic signal sampling value and the report of burst over-limit value data and its waveform.

[0014] Preferably, the monitoring device is installed on a power transmission tower of the line to be monitored, and the ultrasonic probe looks up at the line to be monitored, the elevation angle of the ultrasonic probe looking up at the line is not more than 60 degrees, and the maximum straight-line distance between the ultrasonic probe and the line is not more than 30 meters.

[0015] The line acoustic and magnetic intelligent diagnosis comprehensive monitoring device has the advantages that: the ultrasonic signal is collected in real time by the ultrasonic probe, the ultrasonic signal is amplified and frequency-selected by the conditioning circuit, the ultrasonic signal collection module can effectively cope with high-frequency signal attenuation through corresponding parameter adjustment, and can accurately identify the ultrasonic signal caused by weak discharge within an installation distance of 30 meters, thereby improving the accuracy of line monitoring and the sensitivity of signal monitoring.

[0016] In addition, the monitoring device can realize self-power supply through cooperation of the solar energy storage module and the power management module, realize data storage and remote transmission through cooperation of the core processing module and the remote communication module, and is convenient for data management and remote monitoring, reduces consumption of human resources, solves the line hidden danger early warning problem, and guarantees safe operation of the line. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application, and are used together with the embodiments of the present application to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0018] Figure 1 is a structural schematic view of the present application;

[0019] Figure 2 is a circuit diagram of the conditioning circuit of the present application. DETAILED DESCRIPTION

[0020] When a discharge signal is generated in the line, the gas in the discharge area is ionized, instantaneous high temperature and high pressure are generated, the surrounding medium is rapidly expanded and contracted, and thus an acoustic wave is generated. Since the discharge process is very short and has high energy, the generated acoustic wave frequency is usually in the ultrasonic wave range (above 20 kHz), which is beyond the hearing range of human ears, and therefore it is necessary to utilize spatial ultrasonic monitoring technology to monitor the line fault in real time, so as to realize fault early warning.

[0021] Embodiment one

[0022] As Figure 1As shown, a line acoustic magnetic intelligent diagnosis comprehensive monitoring device is installed on the iron tower of a power transmission line. The monitoring device comprises a solar energy storage module, a power management module, an ultrasonic signal acquisition module, a core processing module and a remote communication module. The core processing module is connected with the ultrasonic signal acquisition module and the remote communication module, and is used for realizing the collection of ultrasonic signals, data conversion and information transmission. The power management module is connected with the solar energy storage module to form a power supply system, and provides stable voltage for the load. The line acoustic magnetic intelligent diagnosis comprehensive monitoring device can perform 7*24-hour ultrasonic monitoring on the hidden discharge of the line.

[0023] The solar energy storage module comprises a solar cell panel and a battery BAT, and the battery management module is connected with the solar cell panel and the battery BAT respectively. In order to ensure that the device can quickly store power in the case of two consecutive sunny days and can maintain uninterrupted operation in the case of more than 20 consecutive rainy days, two solar cell panels are arranged in the embodiment, and two batteries BAT are arranged correspondingly. The solar energy is collected by the solar cell panel, and the electrical energy is stored by the battery BAT. Figure 1 As shown, two solar cell panels are arranged in the embodiment, and two batteries BAT are arranged correspondingly. The solar energy is collected by the solar cell panel, and the electrical energy is stored by the battery BAT.

[0024] Correspondingly, one battery management module is arranged for each of the two solar cell panels, which is used for managing the solar cell panel and the battery BAT. In addition, the outputs of the two battery management modules are hot backed up, so that if any one of the battery BATs has a problem, it will not affect the normal operation of the device.

[0025] The two battery management modules realize the normal supply of the power supply system. The two power management modules obtain energy from the two solar cell panels respectively, and correspondingly fill the battery BAT. The working logic of the power management module is as follows:

[0026] When the input power Pin is greater than the load power Pload, the power supply system preferentially supplies the load to run, and at this time the charging power Pc of the battery BAT is Pin-Pload. When the input power Pin is less than the load power Pload, the power supply system is in a discharging state, and at this time the charging power Pc of the battery BAT is Pload-Pin.

[0027] The ultrasonic signal acquisition module comprises an ultrasonic probe and a conditioning circuit. The ultrasonic probe is used for monitoring the ultrasonic signals of all frequency bands, and the conditioning circuit is used for controlling the bandwidth of the collected ultrasonic signals to be between 20 kHz and 500 kHz.

[0028] As shown in Figure 2 The conditioning circuit comprises an amplifier U1 and an amplifier U2. The amplifier U1 is used for amplifying the input weak signal and improving the signal amplitude, and the amplifier U2 is used for signal frequency selection.

[0029] As shown in Figure 2As shown, the ultrasonic signal collected by the ultrasonic probe is accessed to the conditioning circuit through the VIN terminal, enters the positive input terminal of the amplifier U1 after passing through the voltage division network formed by the resistor R1 and the resistor R2, and the gain setting network is further connected to the amplifier U1, the gain setting network is connected to the negative input terminal and the feedback terminal of the amplifier U1, and the gain setting network includes the resistor R3, the resistor R4 and the capacitor C4, which are used to adjust the gain parameter of the amplifier U1. The power supply terminal of the amplifier U1 is connected with the capacitor C2 and the capacitor C3 in parallel as decoupling capacitors for stable power supply.

[0030] The output terminal of the amplifier U1 is used to output the amplified ultrasonic signal, and the amplified ultrasonic signal is accessed to the amplifier U2 after passing through the filter network, wherein the filter network includes the capacitor C5, the capacitor C7, the resistor R5 and the resistor R6, the capacitor C5, the capacitor C7 and the resistor R6 are connected in series, the common terminal of the capacitor C5 and the resistor R6 is connected with the output terminal of the amplifier U1, the output terminal of the amplifier U1 is connected with the resistor R5, the other terminal of the resistor R5 is grounded, one terminal of the capacitor C5 away from the resistor R6 is accessed to the IN+ pin of the amplifier U2, one terminal of the capacitor C7 away from the resistor R6 is accessed to the IN- pin of the amplifier U2, and the OUT pin of the amplifier U2 outputs the conditioning signal after connecting the capacitor C6.

[0031] The conditioning circuit can eliminate the spatial attenuation of 30 meters for the processed ultrasonic data. The spatial attenuation calculation formula of the ultrasonic signal is as follows:

[0032] Absorption attenuation:

[0033]

[0034] Wherein, f is the frequency of the ultrasonic signal, T is the temperature, P is the air pressure, P0 is the standard reference air pressure, H is the humidity, H0 is the standard reference humidity, μ1 is the material constant related to the viscous absorption of oxygen and nitrogen, and μ2 is the material constant related to the modulation effect of water vapor on relaxation absorption.

[0035] Diffusion attenuation:

[0036]

[0037] Wherein, I0 is the initial sound intensity, and r is the propagation distance.

[0038] The core processing module is used for converting the ultrasonic analog signal transmitted by the ultrasonic signal acquisition module into a digital signal at a sampling speed of 12.5KHz / s, and synchronizing the digital signal with the phase of the power frequency current of the line. The core processing module is also used for performing amplitude and phase analysis on the data obtained by sampling in a power frequency cycle, obtaining the relationship between the maximum amplitude and the power frequency phase, and saving the data in the corresponding relationship. The core processing module is also used for controlling the remote communication module to realize periodic reporting of the sampling values and reporting of the burst out-of-limit value data and the waveform thereof.

[0039] The remote communication module in the embodiment is a 4G module, which is used for remotely transmitting the sampled waveform, the calculated parameter value and other data, and receiving the instructions issued by the back end, so as to ensure that the device is online for a long time and is real-time synchronized.

[0040] In use, the line acoustic-magnetic intelligent diagnosis comprehensive monitoring device is installed on the iron tower of the power transmission line, and the ultrasonic probe is directed upward to the line with a maximum upward angle of not more than 60°, and the maximum straight-line distance of the ultrasonic probe from the line is not more than 30 meters.

[0041] The above only describes preferred embodiments of the present application and is not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments or equivalently replace some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A comprehensive monitoring device for line acoustic-magnetic intelligent diagnosis, characterized in that, It includes a solar energy storage module, a power management module, an ultrasonic signal acquisition module, a core processing module, and a remote communication module. The core processing module is connected to the ultrasonic signal acquisition module and the remote communication module respectively, and is used to realize the acquisition of ultrasonic signals, data conversion, and information transmission. The power management module is connected to the solar energy storage module to form a power supply system to provide a stable voltage for the load. The ultrasonic signal acquisition module includes an ultrasonic probe and a conditioning circuit. The ultrasonic probe is used to monitor ultrasonic signals across the entire frequency band, and the conditioning circuit is used to select the frequency of the acquired ultrasonic signals. The conditioning circuit includes amplifier U1 and amplifier U2. Amplifier U1 is used to amplify the ultrasonic signals, and amplifier U2 is used to select the frequency of the ultrasonic signals.

2. The integrated monitoring device for line acoustic-magnetic intelligent diagnosis according to claim 1, characterized in that, The amplifier U1 is connected to a voltage divider network and a gain setting network. The voltage divider network is used to adjust the magnitude of the input signal, and the gain setting network is used to adjust the amplification parameters of the amplifier U1. The ultrasonic signal acquired by the ultrasonic probe is connected to the conditioning circuit through the VIN terminal. After passing through the voltage divider network, the ultrasonic signal is connected to the positive input terminal of the amplifier U1. The gain setting network is connected to the negative input terminal and the feedback terminal of the amplifier U1. The output terminal of the amplifier U1 is used to output the amplified ultrasonic signal.

3. The integrated monitoring device for line acoustic-magnetic intelligent diagnosis according to claim 2, characterized in that, The output terminal of amplifier U1 is connected to a filter network, which includes capacitor C5, capacitor C7, resistor R5, and resistor R6. Capacitors C5, C7, and R6 are connected in series. The common terminal of capacitor C5 and resistor R6 is connected to the output terminal of amplifier U1. The output terminal of amplifier U1 is connected to resistor R5. The other end of resistor R5 is grounded. The end of capacitor C5 away from resistor R6 is connected to the IN+ pin of amplifier U2. The end of capacitor C7 away from resistor R6 is connected to the IN- pin of amplifier U2. The OUT pin of amplifier U2 is connected to capacitor C6 and outputs the conditioned ultrasonic signal.

4. The integrated monitoring device for line acoustic-magnetic intelligent diagnosis according to claim 1, characterized in that, The bandwidth of the conditioned ultrasonic signal output by the amplifier U2 ranges from 20kHz to 500kHz.

5. The integrated monitoring device for line acoustic-magnetic intelligent diagnosis according to claim 1, characterized in that, The solar energy storage module includes a solar panel and a battery BAT, and the power management module is connected to the solar panel and the battery BAT respectively.

6. The integrated monitoring device for line acoustic-magnetic intelligent diagnosis according to claim 1, characterized in that, The core processing module is used to convert the ultrasonic analog signals transmitted by the ultrasonic signal acquisition module into digital signals and store them.

7. The integrated monitoring device for line acoustic-magnetic intelligent diagnosis according to claim 1, characterized in that, The core processing module is used to control the remote communication module to realize the periodic reporting of ultrasonic signal sampling values ​​and the reporting of sudden out-of-limit data and their waveforms.

8. The integrated monitoring device for line acoustic-magnetic intelligent diagnosis according to claim 1, characterized in that, The monitoring device is installed on the transmission line tower of the line under test, with the ultrasonic probe looking upwards at the line under test. The angle of elevation of the ultrasonic probe to the line does not exceed 60°, and the maximum straight-line distance between the ultrasonic probe and the line does not exceed 30 meters.

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