Distributed hidden danger discharge acquisition circuit

Abstract

The invention relates to the technical field of electric power operation and maintenance, and discloses a distributed hidden danger discharge acquisition circuit which comprises a sensor used for signal acquisition, the sensor is electrically connected with a preprocessing unit used for amplifying and filtering signals, and the preprocessing unit is electrically connected with a peak holding circuit used for converting transient discharge waveforms into stable signals. The output end of the peak holding circuit is electrically connected with an ADC acquisition circuit. According to the invention, the dependence on a high-speed ADC and a real-time processing unit is reduced, and the cost is obviously optimized while the system keeps good monitoring performance.

Description

Technical Field

[0001] This invention relates to the field of power operation and maintenance technology, specifically to a distributed hidden danger discharge acquisition circuit. Background Technology

[0002] With the comprehensive development of power operation and maintenance management, the demand for early anomaly monitoring is increasing compared to post-fault location. Distributed hidden discharge monitoring provides an important technical means for line operation and maintenance by capturing and analyzing hidden discharge phenomena in cables in real time. Its core value lies in shifting from "passive repair" to "proactive prevention and control," significantly improving the reliability and economy of the power grid. For line operation and maintenance, distributed hidden discharge monitoring is like performing a "dynamic electrocardiogram" on power cables, continuously assessing their "health status." It makes operation and maintenance work more proactive, precise, and efficient, and is an indispensable technical pillar for ensuring the safe, stable, and economical operation of the power grid.

[0003] Currently, identifying potential electrical discharges faces three major technical challenges: First, the signal amplitude generated by the discharge is extremely small, making acquisition difficult and resulting in a scarcity of usable effective waveforms. Second, its key frequency components often overlap with electromagnetic noise frequencies in the operating environment, causing difficulties in identification and frequent false alarms. To address these issues, existing technologies have proposed high-sensitivity acquisition schemes. However, these schemes significantly increase the power consumption of monitoring equipment, impose stringent requirements on the stability of on-site power supply, and drive up overall costs. Currently, most mainstream monitoring circuits employ a scheme of directly acquiring the signal after amplification, which generally suffers from low acquisition efficiency, poor power consumption control, and high system costs. Summary of the Invention

[0004] The purpose of this invention is to provide a distributed hidden discharge acquisition circuit that reduces the reliance on high-speed ADCs and real-time processing units, while maintaining good monitoring performance and achieving significant cost optimization.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The present invention discloses a distributed hidden discharge acquisition circuit, including a sensor for signal acquisition, the sensor being electrically connected to a preprocessing unit for signal amplification and filtering, the preprocessing unit being electrically connected to a peak hold circuit for converting transient discharge waveforms into stable signals, and the output terminal of the peak hold circuit being electrically connected to an ADC acquisition circuit.

[0006] Furthermore, the preprocessing unit includes a first signal amplification circuit and a second signal amplification circuit for signal amplification. The input terminal of the first signal amplification circuit is electrically connected to the sensor, and the output terminal of the second signal amplification circuit is electrically connected to the input terminal of the peak hold circuit. A bandpass filter circuit for filtering is connected between the first signal amplification circuit and the second signal amplification circuit. The input terminal of the bandpass filter circuit is electrically connected to the output terminal of the first signal amplification circuit, and the output terminal of the bandpass filter circuit is electrically connected to the input terminal of the second signal amplification circuit.

[0007] Furthermore, the sensor is a high-frequency weak signal coil sensor with frequency selectivity.

[0008] Furthermore, both the first signal amplification circuit and the second signal amplification circuit include a dedicated RF amplifier chip.

[0009] Furthermore, the ADC acquisition is electrically connected to a main control circuit for data processing, the main control circuit is electrically connected to a power control circuit for controlling the power supply, the power control circuit is electrically connected to a corresponding controlled power supply circuit, and the output terminal of the power supply circuit is electrically connected to the power input terminal of the preprocessing unit and the peak hold circuit, respectively.

[0010] Compared with the prior art, the beneficial effects of the present invention are: In practical applications, signals are acquired by a sensor coil, amplified and filtered by a preprocessing unit, and then output to a peak hold circuit. The peak hold circuit converts the high-frequency discharge pulse signal into a slowly varying voltage signal with a longer duration, thereby reducing the requirement for the ADC sampling frequency. Data acquisition is performed using an ADC with a lower sampling rate, which significantly reduces the power consumption of the sampling system while ensuring signal integrity. This invention reduces the dependence on high-speed ADCs and real-time processing units, and the system achieves significant cost optimization while maintaining good monitoring performance. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a circuit structure block diagram of the present invention; Figure 2 This is a circuit schematic diagram of the preprocessing unit of the present invention; Figure 3This is a circuit schematic diagram of the peak hold circuit of the present invention; Figure 4 This is a circuit diagram of the conditioning circuit of the present invention; Figure 5 This is a circuit diagram of the power supply circuit of the present invention. Detailed Implementation

[0013] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0014] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the layers related to the present invention and are not drawn according to the actual number, shape and size of the layers in the actual implementation. In the actual implementation, the form, number and proportion of each layer can be arbitrarily changed, and the layer layout may also be more complex.

[0015] Numerous details are explored in the following description to provide a more thorough explanation of embodiments of the invention; however, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details.

[0016] Please see Figures 1 to 5 A distributed hazardous discharge acquisition circuit includes a sensor for signal acquisition, the sensor being electrically connected to a preprocessing unit for signal amplification and filtering, the preprocessing unit being electrically connected to a peak hold circuit for converting transient discharge waveforms into stable signals, and the output of the peak hold circuit being electrically connected to an ADC acquisition circuit.

[0017] In practical applications, signals are acquired by a sensor coil, amplified and filtered by a preprocessing unit, and then output to a peak hold circuit. The peak hold circuit converts the high-frequency discharge pulse signal into a slowly varying voltage signal with a longer duration, thereby reducing the requirement for the ADC sampling frequency. Data acquisition is performed using an ADC with a lower sampling rate, which significantly reduces the power consumption of the sampling system while ensuring signal integrity. This invention reduces the dependence on high-speed ADCs and real-time processing units, and the system achieves significant cost optimization while maintaining good monitoring performance.

[0018] Please see Figure 2The preprocessing unit includes a first signal amplification circuit and a second signal amplification circuit for signal amplification. The input terminal of the first signal amplification circuit is electrically connected to the sensor, and the output terminal of the second signal amplification circuit is electrically connected to the input terminal of the peak hold circuit. A bandpass filter circuit for filtering is connected between the first signal amplification circuit and the second signal amplification circuit. The input terminal of the bandpass filter circuit is electrically connected to the output terminal of the first signal amplification circuit, and the output terminal of the bandpass filter circuit is electrically connected to the input terminal of the second signal amplification circuit.

[0019] The high-frequency weak signal is amplified by the first signal amplification circuit and the second signal amplification circuit. A bandpass filter circuit is added between the two amplification circuits to remove interference signals.

[0020] Since the discharge signal detected by the sensor is usually very weak, it needs to be amplified by a large factor to meet the acquisition requirements. Therefore, the signal is amplified step by step through the first signal amplification circuit and the second signal amplification circuit to obtain the required gain. At the same time, a bandpass signal is added between the first signal amplification circuit and the second signal amplification circuit. Since the signal is weak and the signal-to-noise ratio is low, the signal is amplified first and then filtered to reduce the noise from drowning out the useful signal. After being amplified by the first signal amplification circuit and filtered to extract the useful signal, it is amplified again by the second signal amplification circuit. The output signal is connected to the peak hold circuit.

[0021] The sensor is a high-frequency weak signal coil sensor with frequency selectivity.

[0022] After the sensor coil acquires the waveform, the signal is amplified by the first and second signal amplification circuits, and then filtered out by a bandpass filter circuit to remove interference from other unwanted frequencies. Because the sensor itself has frequency selectivity, the signal amplitude in non-target frequency bands is low. After passing through the bandpass filter circuit, the target frequency signal is effectively preserved, while interference components are further attenuated, thus significantly improving the anti-interference capability.

[0023] Please see Figure 2 Both the first signal amplification circuit and the second signal amplification circuit include a dedicated RF amplifier chip.

[0024] Both the first and second signal amplification circuits include a dedicated RF amplifier chip, model BGU6104, which can amplify the weak high-frequency signals within the 40 MHz and 4 GHz frequency bands we require, effectively improving the efficiency of capturing and processing weak high-frequency signals.

[0025] Please see Figure 4A conditioning circuit for gain adjustment and isolation is connected between the peak hold circuit and the ADC acquisition circuit. The conditioning circuit includes a third signal amplification circuit whose input terminal is connected to the peak hold circuit. The third signal amplification circuit is used to adjust the signal gain before ADC acquisition. The output terminal of the third signal amplification circuit is connected to an emitter follower circuit for isolation. The output terminal of the emitter follower circuit is connected to the input terminal of the ADC acquisition circuit.

[0026] The conditioning circuit includes a third signal amplifier circuit and an emitter follower circuit. The third signal amplifier circuit can flexibly adjust the signal gain before ADC acquisition. The emitter follower circuit achieves isolation between the front and rear stage circuits through its high input impedance and low output impedance characteristics, eliminates the interference of load changes on the front stage circuit, and reduces the load effect of the rear stage circuit on the front stage circuit, thereby reducing the load effect and ensuring signal stability.

[0027] Please see Figure 1 The ADC acquisition is electrically connected to a main control circuit for data processing. The main control circuit is electrically connected to a power control circuit for controlling the power supply. The power control circuit is electrically connected to a corresponding controlled power supply circuit. The output terminal of the power supply circuit is electrically connected to the power input terminal of the preprocessing unit and the peak hold circuit, respectively.

[0028] Because the discharge of potential hazards is continuous and periodic, the main control circuit uses a power control circuit to periodically control the operation of the power supply circuit to trigger the acquisition signal. The power supply circuit is only activated by the main controller when needed; during non-acquisition periods, the acquisition circuit is powered off, further reducing overall power consumption.

[0029] In the above embodiments, although the invention has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. The embodiments of the invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims.

[0030] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A distributed hazard discharge acquisition circuit, characterized in that: The device includes a sensor for signal acquisition, the sensor being electrically connected to a preprocessing unit for signal amplification and filtering, the preprocessing unit being electrically connected to a peak hold circuit for converting transient discharge waveforms into stable signals, and the output of the peak hold circuit being electrically connected to an ADC acquisition circuit.

2. The distributed hidden danger discharge acquisition circuit according to claim 1, characterized in that, The preprocessing unit includes a first signal amplification circuit and a second signal amplification circuit for signal amplification. The input terminal of the first signal amplification circuit is electrically connected to the sensor, and the output terminal of the second signal amplification circuit is electrically connected to the input terminal of the peak hold circuit. A bandpass filter circuit for filtering is connected between the first signal amplification circuit and the second signal amplification circuit. The input terminal of the bandpass filter circuit is electrically connected to the output terminal of the first signal amplification circuit, and the output terminal of the bandpass filter circuit is electrically connected to the input terminal of the second signal amplification circuit.

3. The distributed hidden danger discharge acquisition circuit according to claim 2, characterized in that, The sensor is a high-frequency weak signal coil sensor with frequency selectivity.

4. The distributed hidden danger discharge acquisition circuit according to claim 2, characterized in that, Both the first signal amplification circuit and the second signal amplification circuit include a dedicated RF amplifier chip.

5. The distributed hidden danger discharge acquisition circuit according to claim 1, characterized in that, The ADC acquisition is electrically connected to a main control circuit for data processing. The main control circuit is electrically connected to a power control circuit for controlling the power supply. The power control circuit is electrically connected to a corresponding controlled power supply circuit. The output terminal of the power supply circuit is electrically connected to the power input terminal of the preprocessing unit and the peak hold circuit, respectively.

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