CN212845727U - Power system pollution flashover detection circuit based on ultrahigh frequency electromagnetic wave - Google Patents
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Abstract
The utility model discloses a power system pollution flashover detection circuitry based on hyperfrequency electromagnetic wave belongs to the power technology field, including antenna, high frequency amplifier, filter circuit, detection circuitry, AD conversion module and core chip, solved the technical problem that adopts hyperfrequency electromagnetic wave to realize filthy insulator detection, the utility model discloses to filthy insulator partial discharge detection, on the basis of analysis filthy insulator partial discharge characteristic, propose to adopt filthy insulator based on hyperfrequency electromagnetic wave to detect, the detection accuracy is high, and the practicality is high, the strong operability also has better stability simultaneously, has compensatied voltage detection method and has operated inconveniently, probably harms personal safety and detects the defect that the precision is not enough.
Description
Technical Field
The utility model belongs to the technical field of electric power, a electric power system pollution flashover detection circuitry based on hyperfrequency electromagnetic wave is related to.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a power system pollution flashover detection circuitry based on hyperfrequency electromagnetic wave has solved the technical problem who adopts hyperfrequency electromagnetic wave to realize filthy insulator detection.
In order to achieve the above purpose, the utility model 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 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 L102, a capacitor C103, an inductor L105 and a capacitor C103, wherein a pin 1 of the low-noise amplifier U1 is connected with the positive electrode of the antenna through the capacitor C100 and the inductor L101 which are connected in series, the negative electrode of the antenna is connected with the ground wire, the positive electrode of the antenna is also connected with the ground wire through the resistor R122, the connection node of the inductor L101 and the capacitor C100 is also connected with the ground wire through the capacitor C102, a pin 2 of the low-noise amplifier U1 is connected with the ground wire, a pin 3 of the low-noise amplifier U1 is connected with a 3V power supply, a pin 3 of the low-noise amplifier U1 is also connected with the ground wire through the capacitor C101, a pin 6 of the low-noise amplifier U1 is connected with a 3V power supply, a pin of the low-noise amplifier U1 is also connected with the, the resistor R101 and the inductor L102 are connected in parallel, a pin 4 of the low noise amplifier U1 is connected with one end of the inductor L103, the other end of the inductor L103 is connected with one end of the capacitor C105, and the other end of the capacitor C105 is an output end of the high frequency amplifier.
Preferably, the filter circuit includes 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 to 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 to 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 PC8211 TK; the type of the amplifier U2 and the type of the amplifier U3 are both uA 741; the model of the A/D conversion module is AD 7655; the model of the core chip is LPC 2138.
A power system pollution flashover detection circuitry based on hyperfrequency electromagnetic wave, solved and adopted hyperfrequency electromagnetic wave to realize the technical problem that filthy insulator detected, the utility model discloses to filthy insulator partial discharge detect, on the basis of analysis filthy insulator partial discharge characteristic, propose to adopt filthy insulator based on hyperfrequency electromagnetic wave to detect, detection accuracy is high, the practicality is high, the strong operability also has better stability simultaneously, has compensatied voltage detection method and has operated inconveniently, probably harms personal safety and detects the defect that the precision is not enough.
Drawings
Fig. 1 is a block diagram of a circuit diagram of the present invention;
fig. 2 is a circuit diagram of the 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 schematic diagram of a simulation test result 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 utility model discloses an antenna received these electromagnetic wave signals, drawed wherein super high frequency component and carried out the analysis, obtained insulator surface partial discharge's relevant information.
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; ε is a dielectric constant; mu is space magnetic conductivity; deltaCIs the current density; then its solution is:
the electromagnetic wave generated by partial discharge is shown to propagate with a velocity v along the direction r 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. By analyzing the data in table 1, it is,the frequency of electromagnetic waves radiated by partial discharge pulses of the contaminated insulator is generally between 200MHz and 2GHz, the heavier the insulator is, the more violent the partial discharge is, the larger the amplitude of leakage current is, the larger the gradient is, the larger the high-frequency component is, and the discharge pulses of the contaminated insulator can generate electromagnetic wave signals which can be detected 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 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 L102, a capacitor C103, an inductor L105 and a capacitor C103, wherein a pin 1 of the low-noise amplifier U1 is connected with the positive electrode of the antenna through the capacitor C100 and the inductor L101 which are connected in series, the negative electrode of the antenna is connected with the ground wire, the positive electrode of the antenna is also connected with the ground wire through the resistor R122, the connection node of the inductor L101 and the capacitor C100 is also connected with the ground wire through the capacitor C102, a pin 2 of the low-noise amplifier U1 is connected with the ground wire, a pin 3 of the low-noise amplifier U1 is connected with a 3V power supply, a pin 3 of the low-noise amplifier U1 is also connected with the ground wire through the capacitor C101, a pin 6 of the low-noise amplifier U1 is connected with a 3V power supply, a pin of the low-noise amplifier U1 is also connected with the, the resistor R101 and the inductor L102 are connected in parallel, a pin 4 of the low noise amplifier U1 is connected with one end of the inductor L103, the other end of the inductor L103 is connected with one end of the capacitor C105, and the other end of the capacitor C105 is an output end of the high frequency 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. Therefore, the utility model adopts the mu PC8211TK type low noise amplifier.
The mu PC8211TK type LNA is a relatively typical low noise amplifier, and when the starting power source 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 gain of the μ PC8211T LNA is 3.0 at power ccV, a typical measured value is 18.5dB, which meets the 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 includes 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 to 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 to 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, the utility model designs a high-pass filter, because the frequency of electromagnetic wave signals generated by the interference of corona and the like of a circuit 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 formed by simple LC circuit complex, the utility model discloses design low pass model earlier, then the low pass converts the high pass into.
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 PC8211 TK; the type of the amplifier U2 and the type of the amplifier U3 are both uA 741; the model of the A/D conversion module is AD 7655; the model of the core chip is LPC 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 utility model discloses select the AD7655 chip that has two kinds of functions of sample-and-hold and AD conversion. The AD7655 is a fast, low power, single power, precision synchronous sampling 16-bit ADC.
The utility model discloses still be equipped with USB module, LCD screen and battery charging management circuit, USB module and LCD screen all are connected with the core chip, and battery charging management circuit is battery charging and right a power system pollution flashover detection circuitry power supply based on hyperfrequency electromagnetic wave.
The utility model discloses the dirty sudden strain of a muscle detection function of research mainly includes real-time detection, under the condition of circuit normal operating promptly, gathers the partial discharge signal of dirty sudden strain of a muscle insulator. 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.
A power system pollution flashover detection circuitry based on hyperfrequency electromagnetic wave, solved and adopted hyperfrequency electromagnetic wave to realize the technical problem that filthy insulator detected, the utility model discloses to filthy insulator partial discharge detect, on the basis of analysis filthy insulator partial discharge characteristic, propose to adopt filthy insulator based on hyperfrequency electromagnetic wave to detect, detection accuracy is high, the practicality is high, the strong operability also has better stability simultaneously, has compensatied voltage detection method and has operated inconveniently, probably harms personal safety and detects the defect that the precision is not enough.
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 power system pollution flashover detection circuit based on the ultrahigh frequency electromagnetic wave as claimed in claim 1, characterized in that: 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 L102, a capacitor C103, an inductor L105 and a capacitor C103, wherein a pin 1 of the low-noise amplifier U1 is connected with the anode of the antenna through the capacitor C100 and the inductor L101 which are connected in series, the cathode of the antenna is connected with the ground wire, the anode of the antenna is also connected with the ground wire through the resistor R122, the connection node of the inductor L101 and the capacitor C100 is also connected with the ground wire through the capacitor C102, a pin 2 of the low-noise amplifier U1 is connected with the ground wire, a pin 3 of the low-noise amplifier U1 is connected with a 3V power supply, a pin 3 of the low-noise amplifier U1 is also connected with the ground wire through the capacitor C101, a pin 6 of the low-noise amplifier U1 is connected with the ground wire through the capacitor C103, a pin 6 of the low-noise amplifier U1 is also connected, the resistor R101 and the inductor L102 are connected in parallel, a pin 4 of the low noise amplifier U1 is connected with one end of the inductor L103, the other end of the inductor L103 is connected with one end of the capacitor C105, and the other end of the capacitor C105 is an output end of the high frequency amplifier.
4. The power system pollution flashover detection circuit based on the ultrahigh frequency electromagnetic wave as claimed in claim 3, characterized in that: 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 as claimed in claim 5, characterized in that: the model of the low noise amplifier U1 is mu PC8211 TK; the type of the amplifier U2 and the type of the amplifier U3 are both uA 741; the model of the A/D conversion module is AD 7655; the model of the core chip is LPC 2138.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113419151A (en) * | 2021-07-15 | 2021-09-21 | 贵州电网有限责任公司 | Portable fault insulator online detection device and detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113419151A (en) * | 2021-07-15 | 2021-09-21 | 贵州电网有限责任公司 | Portable fault insulator online detection device and detection method |
| CN113419151B (en) * | 2021-07-15 | 2022-07-01 | 贵州电网有限责任公司 | Portable fault insulator online detection device and detection method |
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