CN111443268A - Power system pollution flashover detection circuit based on ultrahigh frequency electromagnetic wave - Google Patents
Power system pollution flashover detection circuit based on ultrahigh frequency electromagnetic wave Download PDFInfo
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- CN111443268A CN111443268A CN202010429348.8A CN202010429348A CN111443268A CN 111443268 A CN111443268 A CN 111443268A CN 202010429348 A CN202010429348 A CN 202010429348A CN 111443268 A CN111443268 A CN 111443268A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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Abstract
The invention discloses a pollution flashover detection circuit of a power system based on ultrahigh frequency electromagnetic waves, which belongs to the technical field of power, and comprises an antenna, a high-frequency amplifier, a filter circuit, a detection circuit, an A/D conversion module and a core chip, and solves the technical problem of realizing the detection of a polluted insulator by adopting the ultrahigh frequency electromagnetic waves.
Description
Technical Field
The invention belongs to the technical field of electric power, and relates to a pollution flashover detection circuit of an electric power system based on ultrahigh frequency electromagnetic waves.
Background
The safety and stability of power systems are becoming more and more important in modern society, and insulators are important components of power systems, and the reliability of insulators is directly related to the safety and stability of power systems. The electric power accident has various reasons, and among the accidents caused by natural reasons, the accident caused by the pollution of the electric power insulator is called a pollution flashover accident, and generally causes a large-area electric power accident, and the loss is multiple times of the loss of other accidents. The pollution of the current atmospheric environment is aggravated, and pollution flashover accidents frequently occur. The pollution flashover has various reasons, on one hand, because the insulator is exposed in the air, the pollution resistance is poor; on the other hand, due to climate, the fog weather appears frequently, causing pollution flashover accidents. Therefore, insulation detection is an important subject of power expert research at home and abroad.
In recent years, many researchers have studied the problem of electromagnetic wave pollution detection. The Queensland university of science and technology carries out research on the influence of voltage harmonics on the state evaluation of the insulator, the state of the insulator is evaluated by adopting a method for observing the voltage harmonics, and the defect of voltage distortion is solved by providing a unique index based on a crest factor based on a simulation result. The relation between a polluted insulator and leakage current is researched at the university of Boston in America, the pollution level of the insulator is detected on line through the relation between the leakage current and a solid insulator, and the problem of the measurement precision of the insulation resistance is solved. The professor of Xian traffic university summer long street provides an insulator pollution degree detection method based on a hyperspectral imaging technology, the hyperspectral imaging technology is adopted to realize insulator pollution degree detection [1], feasibility of the hyperspectral imaging technology in insulator external insulation detection is proved, and the method has a wide application prospect. The Song high institute of electrical power saving science of Jiangsu provides a laser-induced breakdown spectroscopy method for surface pollution of insulators, and the laser-induced breakdown spectroscopy method is adopted to realize non-contact measurement of the surface pollution of the insulators, so that the method becomes one of important methods for detecting the pollution degree of the insulators. The research on the flashover characteristic of the polluted insulator realized by the short tail lightning pulse waveform is carried out by the Heng New teaching of Huazhong university of science and technology, the pollution flashover degree of the insulator is realized by adopting the short tail lightning pulse waveform method for detecting the insulator, and the influence of the prestress alternating voltage on the insulator is very small. An on-line detection system for the insulator pollution of the high-voltage transmission line is researched by professor coke shangxin of the university of western-ampere rational engineering, and the method for predicting the insulator pollution flashover by utilizing an expert analysis system realizes the prediction of the insulator pollution flashover and perfects the expert analysis system.
In the traditional technology, the anti-interference capability under a high-voltage environment is poor; the field detection is inconvenient and the safety is not high; the interference causes certain errors and insufficient precision.
Disclosure of Invention
The invention aims to provide a power system pollution flashover detection circuit based on ultrahigh frequency electromagnetic waves, and solves the technical problem of realizing detection of polluted insulators by adopting the ultrahigh frequency electromagnetic waves.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power system pollution flashover detection circuit based on ultrahigh frequency electromagnetic waves comprises an antenna, a high frequency amplifier, a filter circuit, a detection circuit, an A/D conversion module and a core chip, wherein the antenna circuit is used for acquiring ultrahigh frequency electromagnetic wave partial discharge signals of a pollution insulator;
the antenna is connected with the high-frequency amplifier, the high-frequency amplifier is connected with the detection circuit, the detection circuit is connected with the filter circuit, the filter circuit is connected with the A/D conversion module, and the A/D conversion module is connected with the core chip;
the high-frequency amplifier is used for amplifying the ultrahigh frequency electromagnetic wave partial discharge signal received by the antenna to generate an amplified ultrahigh frequency electromagnetic wave partial discharge signal;
the detection circuit comprises a peak detection circuit, a low-frequency envelope detection circuit and a high-frequency envelope detection circuit, wherein the peak detection circuit is used for reducing the frequency of the amplified ultrahigh-frequency electromagnetic wave partial discharge signal and outputting a low-frequency envelope detection signal;
the filter circuit is used for filtering interference clutter in the low-frequency envelope detection signal;
the A/D conversion module is used for converting the low-frequency envelope detection signal into a digital signal;
the core chip is used for storing the digital signals converted by the A/D conversion module and communicating with the upper computer through a serial port.
Preferably, the antenna is a directional antenna for detecting ultra-high frequency electromagnetic waves with a frequency between 200MHz and 2 GHz.
Preferably, the high-frequency amplifier includes a low-noise amplifier U1, a resistor R122, a capacitor C100, a capacitor C102, an inductor L101, a capacitor C101, a resistor R101, an inductor L102, a capacitor C103, an inductor L and a capacitor C103, a pin 1 of the low-noise amplifier U1 is connected to the positive electrode of the antenna through the capacitor C100 and the inductor L connected in series, the negative electrode of the antenna is connected to the ground, the positive electrode of the antenna is also connected to the ground through the resistor R122, a connection node between the inductor L101 and the capacitor C100 is also connected to the ground through the capacitor C102, a pin 2 of the low-noise amplifier U1 is connected to the ground, a pin 3 of the low-noise amplifier U1 is connected to a 3V power supply, a pin 3 of the low-noise amplifier U1 is also connected to the ground through the capacitor C101, a pin 6 of the low-noise amplifier U1 is connected to the ground, a pin 6 of the low-noise amplifier U1 is also connected to the ground through the capacitor C103, a pin 4 and a pin 6 of the low-noise amplifier U1 are connected to the inductor R101, a pin 58L, and another end of the inductor R102 is connected to the high-frequency amplifier U L, and another end of the high-noise amplifier.
Preferably, the filter circuit comprises a resistor RS, a capacitor C21, a capacitor C22, a capacitor C23, an inductor L21, an inductor L22 and a resistor R21, one end of the resistor RS is connected with the peak detection circuit, the resistor RS and the capacitor C21 form a low-pass filter, the capacitor C22, the capacitor C23, the inductor L21, the inductor L22 and the resistor R21 form a high-pass filter, a pin 2 of the capacitor C21 is connected with a pin 1 of the inductor L1, and a pin 2 of the capacitor C23 is an output end of the filter circuit.
Preferably, the peak detector circuit comprises an amplifier U2, an amplifier U3, a diode D1, a resistor R1, a triode Q1 and a resistor R4, a resistor R2, a resistor R3, a capacitor C1, a resistor R5 and a capacitor C2, wherein the positive input end of an amplifier U2 is connected with the output end of the high-frequency amplifier, the negative input end of the amplifier U2 is connected with one end of a resistor R3 through a capacitor C1, the other end of the resistor R3 is connected with the output end of an amplifier U3, the output end of the amplifier U2 is connected with the positive electrode of a diode D1, the negative electrode of a diode D1 is connected with the positive input end of an amplifier U3, the negative input end of an amplifier U3 is connected with the output end of an amplifier U3, the collector of a triode Q1 is connected with the negative input end of an amplifier U2 through a resistor R1, the emitter of the triode D2 is connected with the output end of the amplifier U4, the base of a triode Q1 is connected with;
the positive input end of the amplifier U3 is also connected with the ground wire through a resistor R5 and a capacitor C2 which are connected in parallel;
the output end of the amplifier U3 is connected with the output end of the filter circuit, and the output end of the filter circuit is connected with the A/D conversion module.
Preferably, the model of the low noise amplifier U1 is mu PC8211TK, the models of the amplifier U2 and the amplifier U3 are uA741, the model of the A/D conversion module is AD7655, and the model of the core chip is L PC 2138.
The invention provides a power system pollution flashover detection circuit based on ultrahigh frequency electromagnetic waves, which solves the technical problem of realizing the detection of a polluted insulator by adopting the ultrahigh frequency electromagnetic waves.
Drawings
FIG. 1 is a block diagram of a circuit diagram of the present invention;
FIG. 2 is a circuit diagram of a high frequency amplifier of the present invention;
FIG. 3 is a circuit diagram of the detection circuit of the present invention;
FIG. 4 is a circuit diagram of a filter circuit of the present invention;
FIG. 5 is a diagram showing simulation test results of the detection circuit of the present invention.
Detailed Description
Under the wet condition, the leakage current of the polluted insulator can be gradually increased, and when the current density at a certain position is higher, the moisture is dried to form a dry area. At the moment, a large voltage drop occurs in the drying area, and air is possibly ionized to generate a discharge phenomenon, namely partial discharge. The leakage current of the polluted insulator has a very steep pulse rise and fall process in the process of partial discharge, and the rise time is at least ns grade, even less than ns.
The frequency spectrum characteristic of the discharge radiation electromagnetic wave has an obvious relation with the gradient of the discharge current source, and the larger the current pulse amplitude is, the stronger the capacity of radiating the electromagnetic wave is, and the larger the high-frequency component is. The partial discharge radiates electromagnetic waves having a very rich uhf component to the space. The invention receives the electromagnetic wave signals through the antenna, extracts the ultrahigh frequency component in the electromagnetic wave signals and analyzes the ultrahigh frequency component to obtain the related information of the partial discharge on the surface of the insulator.
The characteristics of the electromagnetic wave generated by the partial discharge pulse along the surface of the contaminated insulator are related to the geometry of the partial discharge source and the dielectric strength at the two ends of the arc. When the discharge arc is short, the partial discharge duration is short, and the high-frequency electromagnetic wave radiation is strong; when the insulating strength of two ends of the discharge arc is high, the discharge process is fast, the discharge pulse is steep, and the high-frequency electromagnetic wave radiation is strong.
Generally, an electromagnetic wave signal can be regarded as a spherical wave emitted from a point source, and it follows maxwell's basic equation of electromagnetic field as follows:
introducing motion vectors
And dynamic scalar bit
This equation can be converted to a dynamic bit equation:
in the formula, rho is a discharge excitation source; is the dielectric constant; mu is space magnetic conductivity;Cis the current density; then its solution is:
in which the electromagnetic wave generated by partial discharge is shown to follow at a velocity v
Directional propagation, as a function of time and space, where (x, y, z) is the target point, (x, y, z) is the source point, and r is the distance between the two points.
Through summarizing and concluding the experiment result of the partial discharge of the simulated pollution insulator, the waveform parameters of the partial discharge pulse of the pollution insulator can be approximately obtained: pulse rising edge time tr, pulse falling edge time td, 50% maximum amplitude pulse duration t 50%, 10% maximum amplitude pulse duration t 10%, and total pulse duration ttotal, wherein the rising edge and pulse width of the creeping discharge pulse waveform are both nanosecond-level time from each part of the discharge pulse, as shown in table 1, it can be seen that the local discharge of the filth insulator can radiate electromagnetic waves with very high frequency:
TABLE 1
According to the research result of the partial discharge current characteristic, the current pulse with steep waveform is formed when partial discharge occurs on the surface of the filthy insulator, and the current pulse for partial discharge along the surface of the filthy insulator is generally 10-9～10-7And the partial discharge pulse of the polluted insulator can generate ultrahigh frequency electromagnetic waves, and the characteristics of the electromagnetic waves generated by the partial discharge pulse are related to the geometric shape of a partial discharge power supply, the insulating strength at two ends of an electric arc and the like. Through the data analysis of table 1, the frequency of the electromagnetic wave radiated by the partial discharge pulse of the pollution insulator is generally between 200MHz and 2GHz, the heavier the insulator is, the more violent the partial discharge is, the larger the amplitude of the leakage current is, the larger the gradient is, the larger the high-frequency component is, and the electromagnetic wave signal which can be detected can be generated by the discharge pulse of the pollution insulator only by selecting a proper antenna.
The electric power system pollution flashover detection circuit based on the ultrahigh frequency electromagnetic wave as shown in fig. 1-5 comprises an antenna, a high frequency amplifier, a filter circuit, a detection circuit, an a/D conversion module and a core chip, wherein the antenna circuit is used for acquiring an ultrahigh frequency electromagnetic wave partial discharge signal of a pollution insulator;
the antenna is connected with the high-frequency amplifier, the high-frequency amplifier is connected with the detection circuit, the detection circuit is connected with the filter circuit, the filter circuit is connected with the A/D conversion module, and the A/D conversion module is connected with the core chip;
the high-frequency amplifier is used for amplifying the ultrahigh frequency electromagnetic wave partial discharge signal received by the antenna to generate an amplified ultrahigh frequency electromagnetic wave partial discharge signal;
the detection circuit comprises a peak detection circuit, a low-frequency envelope detection circuit and a high-frequency envelope detection circuit, wherein the peak detection circuit is used for reducing the frequency of the amplified ultrahigh-frequency electromagnetic wave partial discharge signal and outputting a low-frequency envelope detection signal;
the filter circuit is used for filtering interference clutter in the low-frequency envelope detection signal;
the A/D conversion module is used for converting the low-frequency envelope detection signal into a digital signal;
the core chip is used for storing the digital signals converted by the A/D conversion module and communicating with the upper computer through a serial port.
Preferably, the antenna is a directional antenna for detecting ultra-high frequency electromagnetic waves with a frequency between 200MHz and 2 GHz.
Preferably, the high-frequency amplifier includes a low-noise amplifier U1, a resistor R122, a capacitor C100, a capacitor C102, an inductor L101, a capacitor C101, a resistor R101, an inductor L102, a capacitor C103, an inductor L and a capacitor C103, a pin 1 of the low-noise amplifier U1 is connected to the positive electrode of the antenna through the capacitor C100 and the inductor L connected in series, the negative electrode of the antenna is connected to the ground, the positive electrode of the antenna is also connected to the ground through the resistor R122, a connection node between the inductor L101 and the capacitor C100 is also connected to the ground through the capacitor C102, a pin 2 of the low-noise amplifier U1 is connected to the ground, a pin 3 of the low-noise amplifier U1 is connected to a 3V power supply, a pin 3 of the low-noise amplifier U1 is also connected to the ground through the capacitor C101, a pin 6 of the low-noise amplifier U1 is connected to the ground, a pin 6 of the low-noise amplifier U1 is also connected to the ground through the capacitor C103, a pin 4 and a pin 6 of the low-noise amplifier U1 are connected to the inductor R101, a pin 58L, and another end of the inductor R102 is connected to the high-frequency amplifier U L, and another end of the high-noise amplifier.
The partial discharge intensity on the surface of the filthy insulator is not high, the power of electromagnetic waves radiated to space is low, and meanwhile, the electromagnetic waves are attenuated in the space propagation process, so that signals received by an antenna circuit are weak, the signals need to be amplified before signal processing, and the sensitivity of a detection system is improved.
The frequency band of the ultrahigh frequency electromagnetic wave signal generated by the partial discharge pulse on the surface of the dirty insulator is 200 MHz-2000 MHz, the central frequency is 1000MHz, the boundary frequency is about 300MHz and 1700MHz through analysis, and the range basically meets the requirement of the measured ultrahigh frequency electromagnetic wave signal. The invention thus employs a μ PC8211TK type low noise amplifier.
The mu PC8211TK type L NA is a relatively typical low-noise amplifier, and when the power supply ccV is 3.0, the typical noise coefficient NF of the amplifier is 1.3dB, so that the requirement of measuring electromagnetic wave signals generated by partial discharge on the surface of a dirty insulator is met.
When the power ccV is 3.0, the gain of the model L NA of μ PC8211T is typically 18.5dB, which meets the comprehensive requirements of the sensor.
The third-order intermodulation value of the mu PC8211TK is-12 dBm, and meets the dynamic range requirement of the detection system.
Preferably, the filter circuit comprises a resistor RS, a capacitor C21, a capacitor C22, a capacitor C23, an inductor L21, an inductor L22 and a resistor R21, one end of the resistor RS is connected with the peak detection circuit, the resistor RS and the capacitor C21 form a low-pass filter, the capacitor C22, the capacitor C23, the inductor L21, the inductor L22 and the resistor R21 form a high-pass filter, a pin 2 of the capacitor C21 is connected with a pin 1 of the inductor L1, and a pin 2 of the capacitor C23 is an output end of the filter circuit.
The filter circuit realizes the functions of frequency selection, interference elimination and the like, and the invention designs the high-pass filter, because the frequency of electromagnetic wave signals generated by the interference of line corona and the like is generally less than 300MHz, the lower limit frequency of the filter is designed to be 300 MHz; because the ultrahigh frequency electromagnetic wave frequency domain of the partial discharge signal of the pollution insulator is very wide, the upper limit frequency of the filter is designed to be more than 2000 MHz.
The filter can be compounded by a simple L C circuit, and the invention designs a low-pass model firstly and then converts the low-pass into the high-pass.
Preferably, the peak detector circuit comprises an amplifier U2, an amplifier U3, a diode D1, a resistor R1, a triode Q1 and a resistor R4, a resistor R2, a resistor R3, a capacitor C1, a resistor R5 and a capacitor C2, wherein the positive input end of an amplifier U2 is connected with the output end of the high-frequency amplifier, the negative input end of the amplifier U2 is connected with one end of a resistor R3 through a capacitor C1, the other end of the resistor R3 is connected with the output end of an amplifier U3, the output end of the amplifier U2 is connected with the positive electrode of a diode D1, the negative electrode of a diode D1 is connected with the positive input end of an amplifier U3, the negative input end of an amplifier U3 is connected with the output end of an amplifier U3, the collector of a triode Q1 is connected with the negative input end of an amplifier U2 through a resistor R1, the emitter of the triode D2 is connected with the output end of the amplifier U4, the base of a triode Q1 is connected with;
the positive input end of the amplifier U3 is also connected with the ground wire through a resistor R5 and a capacitor C2 which are connected in parallel;
the output end of the amplifier U3 is connected with the output end of the filter circuit, and the output end of the filter circuit is connected with the A/D conversion module.
In the whole process of detecting the pollution flashover, the peak detection circuit is extremely important and is the key for improving the sensitivity, meanwhile, the circuit can extract the voltage peak value and reduce the frequency of an input signal of the A/D conversion, and a sampling holding circuit and an A/D conversion circuit can be designed more conveniently, so that the peak detection circuit is taken as a typical circuit to carry out simulation in the embodiment.
The peak detection circuit in the hardware circuit for detecting the pollution flashover is generally implemented by a diode D1 through EWB simulation software, but the diode D1 requires the input voltage to be much higher than the on-state voltage thereof to achieve the desired accuracy, so that an active feedback loop is added in the circuit to compensate the on-state voltage of the diode D1, namely, the resistor R1, the transistor Q1 and the resistor R4. Diode D1 can provide a rectifying function and can provide an average value. Resistor R5 is connected in parallel with capacitor C2 to provide low pass filtering, one end of the high speed dual op-amp buffers the filtered signal and the other end provides a high impedance input and feedback node. And the resistor network forms a clamping circuit.
High speed dual op-amps are shown as amplifier U2 and amplifier U3 in fig. 3.
When the input is lower than the average value, the transistor Q1 generates a feedback channel in the forward operational amplifier, the diode D1 is cut off, and when the input is higher than the average value, the transistor Q1 is cut off, and the diode D1 is conducted. Therefore, the negative input tracking output of the operational amplifier is realized through feedback, and the effect of reducing the recovery time of the circuit is achieved. Of course, this purpose can also be realized by a structure of two signals, one signal is used as a control signal, and the other signal is used as an input signal.
Preferably, the model of the low noise amplifier U1 is mu PC8211TK, the models of the amplifier U2 and the amplifier U3 are uA741, the model of the A/D conversion module is AD7655, and the model of the core chip is L PC 2138.
The sampling and holding module is an analog quantity storage device in an analog quantity input channel of a computer system, is an intermediate link for connecting a sampler and an analog-to-digital converter, can hold the level of an input signal during the A/D conversion module, and tracks the change of the input signal after the A/D conversion module is finished. In order to ensure the conversion precision, an additional A/D conversion module is adopted to complete the corresponding function. Therefore, the invention selects an AD7655 chip with two functions of sampling, holding and AD conversion. The AD7655 is a fast, low power, single power, precision synchronous sampling 16-bit ADC.
The invention is also provided with a USB module, an L CD screen and a battery charging management circuit, wherein the USB module and the L CD screen are both connected with the core chip, and the battery charging management circuit charges the battery and supplies power to the electric power system pollution flashover detection circuit based on the ultrahigh frequency electromagnetic wave.
The pollution flashover detection function researched by the invention mainly comprises real-time detection, namely, under the condition that a circuit normally runs, a partial discharge signal of a pollution flashover insulator is collected. The anti-interference function can avoid most interference, and a lot of interference is removed through signal processing and data analysis, so that the anti-interference function is realized.
As shown in fig. 5, according to the simulation result of the present embodiment, for the peak detection signal input within 15MHz, the output result matches the input of the design, and it is in accordance with the expectation of the experiment; in the latter experiment, the error of the detection circuit can be kept within 10 percent, the requirement of system design is met, and the expected effect is achieved.
The invention provides a power system pollution flashover detection circuit based on ultrahigh frequency electromagnetic waves, which solves the technical problem of realizing the detection of a polluted insulator by adopting the ultrahigh frequency electromagnetic waves.
Claims (6)
1. A power system pollution flashover detection circuit based on ultrahigh frequency electromagnetic waves is characterized in that: the system comprises an antenna, a high-frequency amplifier, a filter circuit, a detection circuit, an A/D conversion module and a core chip, wherein the antenna circuit is used for acquiring an ultrahigh frequency electromagnetic wave partial discharge signal of a dirty insulator;
the antenna is connected with the high-frequency amplifier, the high-frequency amplifier is connected with the detection circuit, the detection circuit is connected with the filter circuit, the filter circuit is connected with the A/D conversion module, and the A/D conversion module is connected with the core chip;
the high-frequency amplifier is used for amplifying the ultrahigh frequency electromagnetic wave partial discharge signal received by the antenna to generate an amplified ultrahigh frequency electromagnetic wave partial discharge signal;
the detection circuit comprises a peak detection circuit, a low-frequency envelope detection circuit and a high-frequency envelope detection circuit, wherein the peak detection circuit is used for reducing the frequency of the amplified ultrahigh-frequency electromagnetic wave partial discharge signal and outputting a low-frequency envelope detection signal;
the filter circuit is used for filtering interference clutter in the low-frequency envelope detection signal;
the A/D conversion module is used for converting the low-frequency envelope detection signal into a digital signal;
the core chip is used for storing the digital signals converted by the A/D conversion module and communicating with the upper computer through a serial port.
2. The power system pollution flashover detection circuit based on the ultrahigh frequency electromagnetic wave as claimed in claim 1, characterized in that: the antenna is a directional antenna for detecting ultrahigh frequency electromagnetic waves with the frequency between 200MHz and 2 GHz.
3. The circuit for detecting the pollution flashover of the electric power system based on the ultrahigh frequency electromagnetic wave as claimed in claim 1, wherein the high frequency amplifier comprises a low noise amplifier U1, a resistor R122, a capacitor C100, a capacitor C102, an inductor L101, a capacitor C101, a resistor R101, an inductor L, a capacitor C103, an inductor L and a capacitor C103, wherein the pin 1 of the low noise amplifier U1 is connected with the positive electrode of the antenna through the capacitor C100 and the inductor L connected in series, the negative electrode of the antenna is connected with the ground, the positive electrode of the antenna is further connected with the ground through the resistor R122, the connection node of the inductor L and the capacitor C100 is further connected with the ground through the capacitor C102, the pin 2 of the low noise amplifier U1 is connected with the ground, the pin 3 of the low noise amplifier U1 is connected with the 3V power supply, the pin 3 of the low noise amplifier U1 is further connected with the ground through the capacitor C101, the pin 6 of the low noise amplifier U1 is connected with the 3V power supply, the pin 6 of the low noise amplifier U1 is further connected with the capacitor C103, the pin of the inductor R584 is connected with the high frequency amplifier U39103, and the other end of the inductor R102 is connected with the high noise amplifier U1, and the high frequency amplifier U39103 is connected with the high frequency amplifier U24.
4. The power system pollution flashover detection circuit based on the ultrahigh frequency electromagnetic wave as claimed in claim 3, wherein the filter circuit comprises a resistor RS, a capacitor C21, a capacitor C22, a capacitor C23, an inductor L21, an inductor L22 and a resistor R21, one end of the resistor RS is connected with a peak detection circuit, the resistor RS and the capacitor C21 form a low-pass filter, the capacitor C22, the capacitor C23, the inductor L21, the inductor L22 and the resistor R21 form a high-pass filter, a pin 2 of the capacitor C21 is connected with a pin 1 of the inductor L1, and a pin 2 of the capacitor C23 is an output end of the filter circuit.
5. The power system pollution flashover detection circuit based on the ultrahigh frequency electromagnetic wave as claimed in claim 4, characterized in that: the peak detection circuit comprises an amplifier U2, an amplifier U3, a diode D1, a resistor R1, a triode Q1, a resistor R4, a resistor R2, a resistor R3, a capacitor C1, a resistor R5 and a capacitor C2, the positive input end of an amplifier U2 is connected with the output end of a high-frequency amplifier, the negative input end of the amplifier U2 is connected with one end of a resistor R3 through a capacitor C1, the other end of the resistor R3 is connected with the output end of an amplifier U3, the output end of the amplifier U2 is connected with the positive electrode of a diode D1, the negative electrode of the diode D1 is connected with the positive input end of an amplifier U3, the negative input end of the amplifier U3 is connected with the output end of an amplifier U3, the collector of a triode Q1 is connected with the negative input end of an amplifier U2 through a resistor R1, the emitter of the triode is connected with the output end of an amplifier U2, the base of the triode Q1 is connected with the output end of an amplifier U3;
the positive input end of the amplifier U3 is also connected with the ground wire through a resistor R5 and a capacitor C2 which are connected in parallel;
the output end of the amplifier U3 is connected with the output end of the filter circuit, and the output end of the filter circuit is connected with the A/D conversion module.
6. The power system pollution flashover detection circuit based on the ultrahigh frequency electromagnetic wave is characterized in that the model of the low noise amplifier U1 is mu PC8211TK, the models of the amplifier U2 and the amplifier U3 are uA741, the model of the A/D conversion module is AD7655, and the model of the core chip is L PC 2138.
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| CN113419149A (en) * | 2021-07-15 | 2021-09-21 | 贵州电网有限责任公司 | Fault insulator online detection device and detection method |
| CN113419150A (en) * | 2021-07-15 | 2021-09-21 | 贵州电网有限责任公司 | Fault insulator online detection device and detection method based on electromagnetic compounding |
| CN113504508A (en) * | 2021-04-13 | 2021-10-15 | 惠州市德赛西威智能交通技术研究院有限公司 | Method for improving radar low-frequency envelope and RCTA mirror image target detection |
| CN113740673A (en) * | 2021-07-15 | 2021-12-03 | 贵州电网有限责任公司 | Fault insulator online detection device and detection method based on magnetic array |
| CN114047374A (en) * | 2022-01-11 | 2022-02-15 | 华北电力大学 | GIS (geographic information system) hand window type VFTO (very fast transient overvoltage) sensing and triggering integrated measuring device |
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2020
- 2020-05-20 CN CN202010429348.8A patent/CN111443268A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113504508A (en) * | 2021-04-13 | 2021-10-15 | 惠州市德赛西威智能交通技术研究院有限公司 | Method for improving radar low-frequency envelope and RCTA mirror image target detection |
| CN113504508B (en) * | 2021-04-13 | 2023-11-17 | 惠州市德赛西威智能交通技术研究院有限公司 | Method for improving radar low-frequency envelope and RCTA mirror image target detection |
| CN113419149A (en) * | 2021-07-15 | 2021-09-21 | 贵州电网有限责任公司 | Fault insulator online detection device and detection method |
| CN113419150A (en) * | 2021-07-15 | 2021-09-21 | 贵州电网有限责任公司 | Fault insulator online detection device and detection method based on electromagnetic compounding |
| CN113740673A (en) * | 2021-07-15 | 2021-12-03 | 贵州电网有限责任公司 | Fault insulator online detection device and detection method based on magnetic array |
| CN113419149B (en) * | 2021-07-15 | 2022-07-01 | 贵州电网有限责任公司 | Fault insulator online detection device and detection method |
| CN113740673B (en) * | 2021-07-15 | 2024-05-03 | 贵州电网有限责任公司 | Fault insulator online detection device and detection method based on magnetic array |
| CN114047374A (en) * | 2022-01-11 | 2022-02-15 | 华北电力大学 | GIS (geographic information system) hand window type VFTO (very fast transient overvoltage) sensing and triggering integrated measuring device |
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