Multi-channel lightning current continuous monitoring device

Abstract

The technical problem to be solved by the utility model is to provide a multi-channel lightning current continuous monitoring device, which can monitor a plurality of channels at the same time and store and analyze sampling data only when the lightning current is triggered, thereby saving storage space and energy consumption and being convenient for workers to check. The device comprises four residual current monitoring sensors CH1 to CH4, four lightning current monitoring sensors CH5 to CH8, two switching signal sensors CH9 and CH10, four amplification circuits 1, four follower circuits, an eight-channel ADC chip, an ARM MCU chip, a lightning current trigger circuit, a wireless communication module, a display screen, an EEPROM storage chip, a power supply, a relay 1 and a relay 2. Residual current and lightning current can be monitored at the same time, on-off is controlled through the two relays connected through switching signals according to whether monitoring data is in a normal range or not, and on-off conditions of the relays are displayed through the arranged display screen.

Description

Technical Field

[0001] The utility model relates to the technical field of online monitoring, in particular to a multi-channel lightning current continuous monitoring device. Background Art

[0002] my country has a vast territory, a large mileage of power transmission and distribution lines, complex crossing environments, and lightning strikes occur in mountains, hills, and plains. Overhead transmission lines are located in the wilderness, with long lines, and are easily struck by lightning, which may cause power outages, fires, equipment damage, and other impacts. Therefore, it is necessary to monitor lightning current signals, issue warnings in a timely manner, and take measures. Online monitoring of lightning current is based on Rogowski coil sensor technology to accurately restore the peak value, polarity, and energy of lightning strikes. It can monitor the peak value, polarity, energy, and lightning strike time and number of lightning currents of multiple channels online, and communicate and alarm in time after the lightning strike occurs. The present invention uses a flexible Rogowski coil to detect lightning current data, and converts the current signal into a low-voltage signal through a current measuring transformer. After being processed by an electronic circuit, the measured current can be truly reproduced. In current engineering applications, lightning current monitoring devices are mostly sampled at intervals, and in nature, it is a low-probability event for transmission lines to be struck by lightning. Therefore, it is very likely that transmission lines will be struck by lightning, but there is no timely monitoring, communication, or alarm, resulting in increased losses. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a multi-channel lightning current continuous monitoring device, which can monitor multiple channels at the same time and only save and analyze sampled data when the lightning current is triggered, thus saving storage space and energy consumption and being convenient for staff to view.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: a multi-channel lightning current continuous monitoring device, including four residual current monitoring sensors CH1-CH4, four lightning current monitoring sensors CH5-CH8, two switch signal sensors CH9 and CH10, four amplifier circuits 1, four follower circuits, eight-channel ADC chips, ARM MCU chips, lightning current trigger circuits, wireless communication modules, display screens, EEPROM storage chips, power supplies, relays 1 and 2, wherein the power supplies are electrically connected to various electrical components to provide electrical energy for the electrical components to enable them to work normally;

[0005] The output ends of the residual current monitoring sensors CH1 to CH4 are respectively connected to the input ends of four amplifier circuits 1, and the output ends of the four amplifier circuits 1 are respectively connected to four sampling channels of the ADC chip, and the ADC chip is connected to the ARM MCU chip;

[0006] The output ends of the four lightning current monitoring sensors CH5 to CH8 are respectively connected to the input ends of four follower circuits, and the output ends of the four follower circuits are respectively connected to the remaining four sampling channels of the ADC chip;

[0007] The output ends of the four lightning current monitoring sensors CH5-CH8 are respectively connected to the lightning current trigger circuit, and the lightning current trigger circuit is connected to the ARM MCU chip;

[0008] The output ends of the two switch signal sensors CH9 and CH10 are connected to the input ends of relay 1 and relay 2 respectively, and the output ends of relay 1 and relay 2 are connected to the ARM MCU chip respectively;

[0009] The wireless communication module, display screen and EEPROM storage chip are respectively connected to the ARM MCU chip.

[0010] Furthermore, the lightning current trigger circuit includes four amplifying circuits 2, four-channel bidirectional optocoupler-phototransistors, and four-channel logic gates;

[0011] The four amplifying circuits 2 are respectively connected to the ARM MCU chip;

[0012] The output ends of the four lightning current monitoring sensors CH5~CH8 are respectively connected to the input ends of four amplifier circuits 2, the output ends of the four amplifier circuits 2 are respectively connected to the four input channels of the bidirectional optocoupler-phototransistor, the four output channels of the bidirectional optocoupler-phototransistor are respectively connected to the four input channels of the logic gate, and the output end of the logic gate is connected to the ARM MCU chip.

[0013] Furthermore, the amplifier circuit 2 adopts a program-controlled amplifier circuit, and the program-controlled amplifier circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and an operational amplifier AMP;

[0014] One end of the resistor R3 is connected to the output end of the corresponding lightning current monitoring sensor, the other end of the resistor R3 is connected to the positive input end of the operational amplifier AMP, and the output end of the operational amplifier AMP is connected to the channel corresponding to the bidirectional optocoupler-phototransistor;

[0015] The left and right ends of the capacitor C1 are respectively connected to the negative input terminal and the output terminal of the operational amplifier AMP;

[0016] The left and right ends of the resistor R2 are respectively connected to the negative input terminal and the output terminal of the operational amplifier AMP;

[0017] The resistor R1 is a digital potentiometer, and the resistor R1 is connected to the ARM MCU chip via an SPI serial bus;

[0018] The high end of the resistor R1 is connected to the left end of the resistor R2, the low end of the resistor R1 is connected to the ground end, and the analog output end of the resistor R1 is connected to the left end of the resistor R2.

[0019] Furthermore, the ARM MCU chip is provided with an RS485 interface, a USB interface, and a TF memory card.

[0020] Furthermore, the ARM MCU chip adopts the STM32F4 series single-chip microcomputer.

[0021] Furthermore, the resistor R1 is a digital potentiometer of model AD8400.

[0022] Furthermore, the logic gate is a four-channel NAND gate.

[0023] Furthermore, the communication module is an EC200 communication module.

[0024] Furthermore, the display screen adopts an LCD touch display screen.

[0025] Beneficial effects of the utility model:

[0026] 1. This device has a total of 10 input signal channels, of which CH1~CH4 are residual current signal inputs, CH5~CH8 are lightning current signal inputs, and CH9~CH10 are switch signal inputs. Sampling is performed through the eight channels of the ADC chip, and the residual current and lightning current can be monitored simultaneously. The two relays connected by the switch signal are controlled to open and close according to whether the monitoring data is within the normal range, and the opening and closing status of the relays is displayed on the set display screen.

[0027] 2. The wireless communication module is set up to facilitate the transmission of collection and analysis results, remote setting of parameters, viewing of historical records, etc.; when the data is abnormal, the abnormal data is stored in the EEPROM storage chip, and the abnormal data information and alarm information are transmitted back through the wireless communication module; in addition, this device only saves and analyzes the sampling data when the lightning current is triggered, saving storage space and energy consumption, and making it easier for staff to view abnormal waveforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural block diagram of the multi-channel lightning current continuous monitoring device described in the utility model;

[0029] Figure 2 It is a schematic diagram of the lightning current triggering circuit described in the utility model;

[0030] Figure 3 It is a schematic diagram of the program-controlled amplifier circuit described in the utility model. DETAILED DESCRIPTION

[0031] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] It should be noted that the directions or positional relationships indicated by all directional indication terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" in the embodiments of the present application are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. They are only used to explain the relative positional relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0035] like Figure 1-3As shown, the multi-channel lightning current continuous monitoring device includes four residual current monitoring sensors CH1-CH4, four lightning current monitoring sensors CH5-CH8, two switch signal sensors CH9 and CH10, four amplifier circuits 1, four follower circuits, an eight-channel ADC chip, an ARM MCU chip, a lightning current trigger circuit, a wireless communication module, a display screen, an EEPROM storage chip, a power supply, a relay 1, and a relay 2;

[0036] The output ends of the residual current monitoring sensors CH1 to CH4 are respectively connected to the input ends of the four amplifier circuits 1, and the output ends of the four amplifier circuits 1 are respectively connected to the four sampling channels of the ADC chip. The output signals of the residual current sensors CH1 to CH4 are current signals. Since the output current of the residual current sensors CH1 to CH4 is small, generally 0 to 0.5 mA, a sampling resistor is used to convert it into a voltage signal, and then an amplifier circuit is used to convert it into -5 to +5 V, and finally enters the ADC chip for sampling. The ADC chip is connected to the ARM MCU chip, and the ARM MCU chip analyzes and processes the data information of the ADC chip channel to determine whether there is an abnormality;

[0037] The output ends of the lightning current monitoring sensors CH5 to CH8 are respectively connected to the input ends of the four follower circuits, that is, the output ends of the lightning current monitoring sensors CH5, CH6, CH7, and CH8 are respectively connected to the input ends of the four follower circuits, and the output ends of the four follower circuits are respectively connected to the remaining four sampling channels of the ADC chip. Since the output signals of the lightning current sensors CH5, CH6, CH7, and CH8 are -5 to +5V, there is no need for signal amplification. The corresponding follower circuits are connected to isolate the front and rear stage circuits, and then enter the ADC chip for sampling. The ARM MCU chip analyzes and processes the data information of the ADC chip channel to determine whether there is an abnormality;

[0038] The output ends of the lightning current monitoring sensors CH5 to CH8 are respectively connected to the lightning current trigger circuit, that is, the output ends of the lightning current monitoring sensors CH5, CH6, CH7, and CH8 are respectively connected to the lightning current trigger circuit, and the lightning current trigger circuit is connected to the ARM MCU chip. The lightning current trigger circuit is used to determine whether to save, analyze, and alarm the lightning current signal;

[0039] The output ends of the two switch signal sensors CH9 and CH10 are respectively connected to the input ends of relay 1 and relay 2, and the output ends of relay 1 and relay 2 are respectively connected to the ARM MCU chip. The ADC chip collects the monitoring data of each channel and transmits it to the ARM MCU chip. The ARM MCU chip analyzes and judges the data. The ARM MCU chip controls the disconnection of the relay connected to the switch signal sensor according to whether the data is within the normal range, and displays the disconnection status of the relay through the display screen;

[0040] The wireless communication module, display screen, and EEPROM storage chip are respectively connected to the ARM MCU chip, and the EEPROM is used for local storage of collected data, configuration parameters, etc.

[0041] like Figure 2 As shown, in this embodiment, the lightning current trigger circuit includes four amplifying circuits 2, four-channel bidirectional optocoupler-phototransistors, and four-channel logic gates;

[0042] The four amplifying circuits 2 are respectively connected to the ARM MCU chip;

[0043] The output ends of the four lightning current monitoring sensors CH5~CH8 are respectively connected to the input ends of the four amplifier circuits 2, and the output ends of the four amplifier circuits 2 are respectively connected to the four input channels of the bidirectional optocoupler-phototransistor, and the four output channels of the bidirectional optocoupler-phototransistor are respectively connected to the four input channels of the logic gate, and the output end of the logic gate is connected to the ARM MCU chip. The lightning current trigger circuit is used to determine whether to sample the lightning current. The output signals of the four lightning current monitoring sensors CH5~CH8 are amplified by the four amplifier circuits 2 and then connected to the four-channel bidirectional optocoupler-phototransistor, wherein the other end of the input end of the transistor is grounded, the collector of the output end of the transistor is connected to the logic gate, and the emitter is grounded; the conduction voltage drop of the light emitting diode in the optocoupler-phototransistor is 1.2V, and the gain of the amplifier circuit is set according to the actual situation. When there is no input or the input voltage is less than 100mV, the optocoupler-phototransistor is not turned on, and the logic gate outputs a low level. When the input voltage of any channel is greater than 100mV, the optocoupler-phototransistor corresponding to the channel is turned on, and the voltage of the corresponding input channel of the logic gate is pulled down, and the output is a high level.

[0044] like Figure 3 As shown, in this embodiment, as a preference, the amplifier circuit 2 adopts a program-controlled amplifier circuit, and the program-controlled amplifier circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and an operational amplifier AMP, wherein the resistor R2 is a feedback resistor;

[0045] One end of the resistor R3 is connected to the output end of the corresponding lightning current monitoring sensor, the other end of the resistor R3 is connected to the positive input end of the operational amplifier AMP, and the output end of the operational amplifier AMP is connected to the corresponding channel of the bidirectional optocoupler-phototransistor;

[0046] The left and right ends of the capacitor C1 are respectively connected to the negative input terminal and the output terminal of the operational amplifier AMP;

[0047] The left and right ends of the resistor R2 are respectively connected to the negative input terminal and the output terminal of the operational amplifier AMP;

[0048] The resistor R1 is a digital potentiometer, and the resistor R1 is connected to the ARM MCU chip via an SPI serial bus;

[0049] The high end of the resistor R1 is connected to the left end of the resistor R2, the low end of the resistor R1 is connected to the ground end, and the analog output end of the resistor R1 is connected to the left end of the resistor R2. The above circuit realizes a program-controllable integrator.

[0050] In this embodiment, as a preference, the ARM MCU chip is provided with an RS485 interface, a USB interface, and a TF memory card. Long-distance wired communication can be achieved through the RS485 interface. When the monitoring data is abnormal, information and alarms are sent through RS485 communication, and the normal transmission of data information is ensured in conjunction with the wireless communication module. The set USB interface can directly export test data, which is convenient for centralized analysis, viewing historical data, etc. The TF memory card can be used to copy data information for easy carrying.

[0051] In this embodiment, preferably, the ARM MCU chip adopts the STM32F4 series single-chip microcomputer. When the lightning current trigger circuit outputs a high level, the ARM MCU chip immediately reads and saves the sampling data of the ADC chip, issues a warning and displays it on the display screen.

[0052] In this embodiment, as a preference, the resistor R1 adopts a digital potentiometer of model AD8400, 256-bit resolution, and a nominal resistance of 1 kΩ to realize a programmable integrator. It may also be realized by using a digital potentiometer of other resistance values ​​and higher resolution.

[0053] In this embodiment, preferably, the logic gate is a four-channel NAND gate, the input is connected to a pull-up resistor, and the output is connected to a pull-down resistor.

[0054] In this embodiment, as a preference, the wireless communication module selects the EC200 communication module, which is compatible with 2G, 3G, and 4G networks, and is compatible with all networks of China Mobile, China Telecom, and China Unicom, and is used to transmit collection and analysis results, remotely set parameters, view historical records, etc.

[0055] Furthermore, the display screen adopts an LCD touch screen, specifically a capacitive touch screen with a resolution of 1024*768, which can be used for data display, user settings and other human-computer interaction operations.

[0056] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A multi-channel lightning current continuous monitoring device, characterized in that: It includes four residual current monitoring sensors CH1-CH4, four lightning current monitoring sensors CH5-CH8, two switch signal sensors CH9 and CH10, four amplifier circuits 1, four follower circuits, an eight-channel ADC chip, an ARM MCU chip, a lightning current trigger circuit, a wireless communication module, a display screen, an EEPROM storage chip, a power supply, a relay 1, and a relay 2; The output ends of the residual current monitoring sensors CH1 to CH4 are respectively connected to the input ends of four amplifier circuits 1, and the output ends of the four amplifier circuits 1 are respectively connected to four sampling channels of the ADC chip, and the ADC chip is connected to the ARM MCU chip; The output ends of the four lightning current monitoring sensors CH5 to CH8 are respectively connected to the input ends of four follower circuits, and the output ends of the four follower circuits are respectively connected to the remaining four sampling channels of the ADC chip; The output ends of the four lightning current monitoring sensors CH5-CH8 are respectively connected to the lightning current trigger circuit, and the lightning current trigger circuit is connected to the ARM MCU chip; The output ends of the two switch signal sensors CH9 and CH10 are connected to the input ends of relay 1 and relay 2 respectively, and the output ends of relay 1 and relay 2 are connected to the ARM MCU chip respectively; The wireless communication module, display screen and EEPROM storage chip are respectively connected to the ARM MCU chip.

2. A multi-channel lightning current continuous monitoring device according to claim 1, characterized in that: The lightning current trigger circuit includes four amplifying circuits 2, four-channel bidirectional optocoupler-phototransistors, and four-channel logic gates; The four amplifying circuits 2 are respectively connected to the ARM MCU chip; The output ends of the four lightning current monitoring sensors CH5~CH8 are respectively connected to the input ends of four amplifier circuits 2, the output ends of the four amplifier circuits 2 are respectively connected to the four input channels of the bidirectional optocoupler-phototransistor, the four output channels of the bidirectional optocoupler-phototransistor are respectively connected to the four input channels of the logic gate, and the output end of the logic gate is connected to the ARM MCU chip.

3. A multi-channel lightning current continuous monitoring device according to claim 2, characterized in that: The amplifier circuit 2 adopts a program-controlled amplifier circuit, which includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and an operational amplifier AMP; One end of the resistor R3 is connected to the output end of the corresponding lightning current monitoring sensor, the other end of the resistor R3 is connected to the positive input end of the operational amplifier AMP, and the output end of the operational amplifier AMP is connected to the channel corresponding to the bidirectional optocoupler-phototransistor; The left and right ends of the capacitor C1 are respectively connected to the negative input terminal and the output terminal of the operational amplifier AMP; The left and right ends of the resistor R2 are respectively connected to the negative input terminal and the output terminal of the operational amplifier AMP; The resistor R1 is a digital potentiometer, and the resistor R1 is connected to the ARM MCU chip via an SPI serial bus; The high end of the resistor R1 is connected to the left end of the resistor R2, the low end of the resistor R1 is connected to the ground end, and the analog output end of the resistor R1 is connected to the left end of the resistor R2.

4. A multi-channel lightning current continuous monitoring device according to claim 3, characterized in that: The ARM MCU chip is provided with an RS485 interface, a USB interface, and a TF memory card.

5. A multi-channel lightning current continuous monitoring device according to claim 4, characterized in that: The ARM MCU chip adopts the STM32F4 series single-chip microcomputer.

6. A multi-channel lightning current continuous monitoring device according to claim 5, characterized in that: The resistor R1 is a digital potentiometer of model AD8400.

7. A multi-channel lightning current continuous monitoring device according to claim 6, characterized in that: The logic gate adopts a four-channel NAND gate.

8. A multi-channel lightning current continuous monitoring device according to claim 7, characterized in that: The wireless communication module is an EC200 communication module.

9. A multi-channel lightning current continuous monitoring device according to claim 8, characterized in that: The display screen adopts an LCD touch display screen.

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