An online lightning arrester monitor powered by leakage current

Abstract

The purpose of the present invention is to provide an online lightning arrester monitor powered by leakage current, comprising a lightning arrester detection mechanism, the lightning arrester detection mechanism comprising a lightning arrester receiving rod and a lightning arrester detection box, the lightning arrester detection box is set as a cylindrical structure, the lightning arrester receiving rod is fixed to the upper end of the lightning arrester detection box by a rotating fixing device, the leakage output end in the lightning arrester detection box is connected to a lightning arrester detection counting system powered by leakage current through a conductive lead, the input end of the lightning arrester detection counting system is directly connected to the lightning arrester receiving rod to store energy, and then the detection circuit is used to sample the full current and negative current of the lightning arrester leakage current, and send them out wirelessly, which can effectively collect the number of lightning strikes, improve the collection accuracy, effectively improve the timeliness of detection, solve the problem of dependence on external power supply, and effectively extend the service life with strong reliability.

Description

Technical Field

[0001] The invention relates to the field of power transmission and transformation information collection, and mainly relates to an arrester online monitor powered by leakage current. Background Art

[0002] With the development of social and economic life, people have relatively high requirements for electricity consumption, especially in the distribution and transmission applications of substations. However, in the current distribution and transmission, the most important thing to pay attention to is to avoid the impact of electric shock. Electric shock has a great impact on transmission. Therefore, in actual transmission, it is necessary to install lightning protection devices in the transmission and substation lines, and count the number of lightning strikes. However, at this stage, lightning strike counters have been widely used in several power lines. With the continuous development of the power grid, line inspection work has become more and more arduous and the risk factor is higher. Therefore, there is an urgent need for an online monitoring system for lightning arresters that can automatically wipe and send relevant data. However, it is currently mostly achieved by battery power supply or solar power supply. On the one hand, it leads to a substantial increase in costs, and during the use period, the corresponding accessories need to be replaced, which is relatively complicated and costly.

[0003] Therefore, an online monitor for lightning arresters powered by leakage current is provided. By improving the traditional lightning strike counting detection system, a supercapacitor is used to collect the leakage current of the lightning arrester to store the energy, and then the full current and negative current of the leakage current of the lightning arrester are sampled by a detection circuit, and sent wirelessly. It can effectively collect the number of lightning strikes, improve the collection accuracy, and effectively improve the timeliness of detection. At the same time, charging with leakage current can solve the problem of dependence on external power supply, and can also effectively extend the service life and have high reliability. This has become a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide an arrester online monitor powered by leakage current. By improving the traditional lightning strike counting detection system, a super capacitor is used to collect the arrester leakage current to store energy, and then the full current and negative current of the arrester leakage current are sampled by a detection circuit and sent wirelessly. The number of lightning strikes can be effectively collected to improve the collection accuracy and the timeliness of detection. At the same time, charging by leakage current can solve the problem of dependence on external power supply, and can effectively extend the service life and have strong reliability.

[0005] In order to solve the technical problems described in the background technology, the present invention adopts the following technical solutions:

[0006] A lightning arrester online monitor powered by leakage current comprises a lightning arrester detection mechanism, wherein the lightning arrester detection mechanism comprises a lightning arrester receiving rod and a lightning arrester detection box, wherein the lightning arrester detection box is configured as a cylindrical structure, wherein the lightning arrester receiving rod is fixed to the upper end of the lightning arrester detection box by a rotating fixing device, wherein the leakage output end in the lightning arrester detection box is connected to a lightning arrester detection counting system powered by leakage current by a conductive lead, and wherein the input end of the lightning arrester detection counting system is directly connected to the lightning arrester receiving rod.

[0007] Preferably, the rotating fixing device includes a connecting block and a rotating shaft, one end of the connecting block is vertically fixed to the top of the lightning protection detection box, and the other end of the connecting block is connected to the lightning protection receiving rod through the rotating shaft. By arranging a rotatable rotating device on the top of the lightning protection detection box to fix the lightning protection receiving rod, the lightning protection receiving rod can be effectively adjusted in all directions, and any position can be effectively adjusted and fixed, thereby effectively improving the adaptability strength of the lightning protection receiving rod.

[0008] Preferably, two detachable fixed mounting blocks are provided at the top of the lightning protection detection box, fixing holes are provided on the two fixed mounting blocks, and an angle of 90 degrees is set between the two fixed mounting blocks. By using two fixed mounting blocks with an angle of 90 degrees, the stability strength of the lightning protection detection box when fixed can be effectively improved. By limiting the stress at the 90-degree angle, deformation and looseness caused by stress changes during installation can be effectively prevented.

[0009] Preferably, the lightning protection detection and counting system includes a main control chip system, a current type voltage transformer and a current detection chip. The lightning arrester leakage current of the lightning protection receiving rod is connected to the input end of the rectifier bridge through one side of the current type voltage transformer, and the output end of the rectifier bridge is connected to the lightning arrester leakage current output. The other side of the current type voltage transformer is connected to the positive input end of the peak follower circuit through the positive terminal = input end of the amplifier through the current detection chip, the input end of the second-order bandpass filter is connected to the negative terminal of the amplifier through resistor R6, and the output end of the second-order bandpass filter is connected to the positive input end of the peak follower circuit.

[0010] Preferably, one side of the rectifier bridge is connected to the input end of the lightning strike counter, the output end 2 of the lightning strike counter is electrically connected to the super energy storage capacitor, the super energy storage capacitor is connected to the voltage detection chip, and an ammeter P1 is provided between the lightning strike counter and the super energy storage capacitor.

[0011] Preferably, the main control chip system is a minimum system composed of a single chip, and the chip used in the main control chip system is an STM32L051C8T6 chip.

[0012] Preferably, the lightning protection detection and counting system is also provided with a 433MHz wireless module.

[0013] Preferably, the lightning protection detection and counting system further comprises a power supply circuit consisting of a data acquisition chip and a main control chip.

[0014] Preferably, the leakage current charging threshold of the lightning protection detection and counting system is 140 μA, and the lightning protection detection and counting system sends data on leakage current, resistive current, number of lightning strikes and ambient temperature 10 hours after the first charging, and thereafter sends data every 8 hours.

[0015] Technical principle: Since most transmission lines use AC transmission, the leakage current of the arrester is also 50Hz AC, and due to the equivalent capacitance of the arrester itself, there is a certain phase difference between the voltage phase applied to both ends of the arrester and the leakage current. The total current of the arrester is composed of resistive current and capacitive current. The ratio of the two is about 1 to 4 under normal circumstances. The leakage current is drawn from both ends of the zinc oxide valve through the lead wire and enters the rectifier bridge through the current type voltage transformer. The rectified current flows through the lightning strike counter and the ammeter head, and finally enters the supercapacitor to charge the supercapacitor. The current signal induced by the current type voltage transformer and the leakage current enters the sampling circuit. When the supercapacitor is charged to a certain voltage, the entire circuit starts to work, and the single-chip drive power chip supplies power to the sampling circuit. After the sampling circuit starts to work, the signal is filtered, amplified and sent to the single-chip ADC pin for sampling. After the sampling is completed, the single-chip turns off the power supply of the sampling circuit to save energy, and then performs relevant calculations, and collects the temperature and humidity data of the surrounding environment of the arrester. Finally, the microcontroller packages the acquired data on the arrester leakage current, the number of lightning strikes the arrester has experienced, and the ambient temperature and humidity data, and sends them out via a 433MHz wireless signal. After sending, the microcontroller enters stop mode to save energy. The entire system is in a state of uninterrupted power supply. When struck by lightning, the microcontroller will record it. After the specified wake-up time is reached, the microcontroller will enter the working state again to collect relevant data and then send it.

[0016] Through the above design, the power supply problem of the lightning arrester online monitor is solved, and the line patrol workers’ tower climbing operations are reduced through wireless transmission, thus reducing the risks.

[0017] The beneficial effects of the present invention are:

[0018] 1) By using supercapacitors to collect the arrester leakage current, the energy is stored, and then the detection circuit is used to sample the full current and negative current of the arrester leakage current, and sent wirelessly, it can effectively collect the number of lightning strikes, improve the collection accuracy, and effectively improve the timeliness of detection.

[0019] 2) Using leakage current for charging can solve the problem of external power dependence, and can also effectively extend the service life and have strong reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a structural schematic diagram of an arrester online monitor powered by leakage current according to the present invention;

[0022] Figure 2 It is a structural schematic diagram of an arrester online monitor powered by leakage current according to the present invention;

[0023] Figure 3 This is a schematic diagram of the system circuit of an online lightning arrester monitor powered by leakage current according to the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below.

[0025] Please refer to Figure 1 , Figure 2 , Figure 3 , an arrester online monitor powered by leakage current, including an arrester detection mechanism, the arrester detection mechanism including a lightning receiving rod 4 and a lightning detection box 1, the lightning detection box 1 is set to a cylindrical structure, the lightning receiving rod 4 is fixed to the upper end of the lightning detection box 1 by a rotating fixing device, the leakage output end in the lightning detection box 1 is connected to a lightning detection counting system powered by leakage current through a conductive lead, and the input end of the lightning detection counting system is directly connected to the lightning receiving rod 4.

[0026] Furthermore, the rotating fixing device includes a connecting block 2 and a rotating shaft 3, one end of the connecting block 2 is vertically fixed to the top of the lightning protection detection box 1, and the other end of the connecting block 2 is connected to the lightning protection receiving rod 4 through the rotating shaft 3. By setting a rotatable rotating device on the top of the lightning protection detection box 1 to fix the lightning protection receiving rod 4, the lightning protection receiving rod 4 can be effectively adjusted in all directions, and any position can be effectively adjusted and fixed, thereby effectively improving the adaptability strength of the lightning protection receiving rod 4.

[0027] Furthermore, two detachable fixed mounting blocks 6 are provided at the top of the lightning protection detection box 1, and fixing holes 5 are provided on the two fixed mounting blocks 6, and an angle of 90 degrees is set between the two fixed mounting blocks 6. Through the two fixed mounting blocks 6 with an angle of 90 degrees, the stability strength of the lightning protection detection box 1 when fixed can be effectively improved, and the mutual limitation of stress at the 90-degree angle can effectively prevent deformation and loosening caused by stress changes during installation.

[0028] Furthermore, the lightning protection detection and counting system includes a main control chip system, a current-type voltage transformer and a current detection chip. The lightning arrester leakage current of the lightning protection receiving rod is connected to the input end of the rectifier bridge through one side of the current-type voltage transformer, and the output end of the rectifier bridge is connected to the lightning arrester leakage current output. The other side of the current-type voltage transformer is connected to the positive input end of the peak follower circuit through the positive terminal = input end of the amplifier through the current detection chip, the input end of the second-order bandpass filter is connected to the negative terminal of the amplifier through resistor R6, and the output end of the second-order bandpass filter is connected to the positive input end of the peak follower circuit.

[0029] Furthermore, one side of the rectifier bridge is connected to the input end of the lightning strike counter, the output end 2 of the lightning strike counter is electrically connected to the super energy storage capacitor, the super energy storage capacitor is connected to the voltage detection chip, and an ammeter P1 is provided between the lightning strike counter and the super energy storage capacitor.

[0030] Furthermore, the main control chip system is a minimum system composed of a single chip, and the chip used in the main control chip system is the STM32L051C8T6 chip.

[0031] Furthermore, the lightning protection detection and counting system is also provided with a 433MHz wireless module.

[0032] Furthermore, the lightning protection detection and counting system also includes a power supply circuit consisting of a data acquisition chip and a main control chip.

[0033] Furthermore, the leakage current charging threshold of the lightning protection detection and counting system is 140 μA, and the lightning protection detection and counting system sends data on leakage current, resistive current, number of lightning strikes and ambient temperature 10 hours after the first charging, and thereafter sends data every 8 hours.

[0034] Furthermore, since most transmission lines use AC transmission, the leakage current of the arrester is also 50Hz AC, and due to the equivalent capacitance of the arrester itself, there is a certain phase difference between the voltage phase applied to both ends of the arrester and the leakage current phase. The total current of the arrester is composed of resistive current and capacitive current. The ratio of the two is about 1 to 4 under normal circumstances. The leakage current is drawn from both ends of the zinc oxide valve plate through the lead wire and enters the rectifier bridge through the current type voltage transformer. The rectified current flows through the lightning strike counter and the ammeter head, and finally enters the supercapacitor to charge the supercapacitor. The current signal induced by the current type voltage transformer and the leakage current enters the sampling circuit. When the supercapacitor is charged to a certain voltage, the entire circuit starts to work, and the single-chip microcomputer drives the power supply chip to power the sampling circuit. After the sampling circuit starts to work, the signal is filtered, amplified and sent to the single-chip microcomputer ADC pin for sampling. After the sampling is completed, the single-chip microcomputer turns off the power supply of the sampling circuit to save energy, and then performs relevant calculations, while collecting the temperature and humidity data of the surrounding environment of the arrester. Finally, the microcontroller packages the acquired data on the arrester leakage current, the number of lightning strikes the arrester has experienced, and the ambient temperature and humidity data, and sends them out via a 433MHz wireless signal. After sending, the microcontroller enters stop mode to save energy. The entire system is in a state of uninterrupted power supply. When struck by lightning, the microcontroller will record it. After the specified wake-up time is reached, the microcontroller will enter the working state again to collect relevant data and then send it.

[0035] Through the above design, the power supply problem of the arrester online monitor is solved, and the line patrol workers are reduced to climb the tower through wireless transmission, which reduces the risk. The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that for ordinary technicians in this field, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above description is illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An arrester online monitor powered by leakage current, comprising an arrester detection mechanism, characterized in that: The lightning arrester detection mechanism includes a lightning receiving rod and a lightning detection box. The lightning detection box is set to a cylindrical structure. The lightning receiving rod is fixed to the upper end of the lightning detection box by a rotating fixing device. The leakage output end in the lightning detection box is connected to a lightning detection counting system that can be powered by leakage current through a conductive lead. The input end of the lightning detection counting system is directly connected to the lightning receiving rod. The rotating fixing device includes a connecting block and a rotating shaft. One end of the connecting block is vertically fixed to the top of the lightning detection box, and the other end of the connecting block is connected to the lightning receiving rod through a rotating shaft. The top of the lightning detection box is provided with two detachable fixed mounting blocks. The two The fixed mounting block is provided with a fixing hole, and the angle between the two fixed mounting blocks is set to 90 degrees. The lightning protection detection counting system includes a main control chip system, a current type voltage transformer and a current detection chip. The lightning arrester leakage current of the lightning protection receiving rod is connected to the input end of the rectifier bridge through one side of the current type voltage transformer, and the output end of the rectifier bridge is connected to the lightning arrester leakage current output. The other side of the current type voltage transformer is connected to the positive input end of the peak follower circuit through the positive terminal = input end of the amplifier through the current detection chip, the input end of the second-order bandpass filter is connected to the negative terminal of the amplifier through the resistor R6, and the output end of the second-order bandpass filter is connected to the positive input end of the peak follower circuit.

2. The arrester online monitor using leakage current power supply according to claim 1, characterized in that: One side of the rectifier bridge is connected to the input end of the lightning strike counter, the output end 2 of the lightning strike counter is electrically connected to the super energy storage capacitor, the super energy storage capacitor is connected to the voltage detection chip, and an ammeter P1 is provided between the lightning strike counter and the super energy storage capacitor.

3. The arrester online monitor powered by leakage current according to claim 1, characterized in that: The main control chip system is a minimum system composed of a single chip, and the chip used in the main control chip system is the STM32L051C8T6 chip.

4. The arrester online monitor powered by leakage current according to claim 1, characterized in that: The lightning protection detection and counting system is also provided with a 433MHz wireless module.

5. The arrester online monitor powered by leakage current according to claim 1, characterized in that: The lightning protection detection and counting system also includes a power supply circuit consisting of a collection chip and a main control chip.

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