Lightning arrester remote transmission meter with wireless and wired communication modes

Abstract

The utility model relates to a lightning arrester remote transmission meter, in particular to a lightning arrester remote transmission meter with wireless and wired communication modes. The remote transmission meter comprises a main control unit, a wireless communication module, a wired communication module and a power supply module. The input end of the main control unit is electrically connected with the grounding end of the lightning arrester to be monitored; the grounding end of the main control unit is grounded; the input ends of the wireless communication module and the wired communication module are electrically connected with the communication end of the main control unit respectively, and the output ends are electrically connected and in wireless communication connection with an external upper module respectively; the power supply module is electrically connected with the power supply end of the main control unit. According to the utility model, when the wired communication mode fails, the system can switch the communication mode with the failed remote transmission meter to the wireless mode, so that the communication reliability is provided.

Description

Technical Field

[0001] This utility model relates to a remote transmission meter for surge arresters, specifically a remote transmission meter for surge arresters with both wireless and wired communication methods. Background Technology

[0002] Currently, the remote transmission methods for monitoring data from surge arresters in power systems are divided into two types: wired and wireless. Wired communication mainly uses RS485 fieldbus for data transmission; wireless communication includes short-range wireless communication represented by LoRa / 2.4G and long-range wireless communication represented by NB-IoT / 4G (this latter method requires data transmission through the operator's network).

[0003] Currently, remote meters on the market use either wireless or wired methods for data transmission. However, the use of a single data transmission method results in lower reliability and limited application scope. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems of low reliability and limited application range of existing remote transmission meters due to their use of a single data transmission method, and to provide a surge arrester remote transmission meter with both wireless and wired communication methods.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A surge arrester remote meter with both wireless and wired communication capabilities is characterized by the following:

[0007] It includes a main control unit, a wireless communication module, a wired communication module, and a power supply module;

[0008] The input terminal of the main control unit is electrically connected to the grounding terminal of the surge arrester to be monitored, and is used to collect the leakage current and discharge current of the surge arrester in order to monitor the leakage current and the number of times the surge arrester operates; the grounding terminal of the main control unit is grounded.

[0009] The input terminals of the wireless communication module and the wired communication module are electrically connected to the communication terminal of the main control unit, and the output terminals are wirelessly and electrically connected to the external host module, respectively, to send the surge arrester leakage current and operation number information output by the main control unit to the host module.

[0010] The power supply module is electrically connected to the power supply terminal of the main control unit and the wired communication module, and is used to supply power to the main control unit and the wired communication module.

[0011] Furthermore, the power supply module includes a first power supply circuit, a second power supply circuit, a third power supply circuit, a fourth power supply circuit, a solar panel, and a battery;

[0012] The input terminal of the first power supply circuit is electrically connected to the grounding terminal of the surge arrester to be monitored, and the output terminal is electrically connected to the first power supply terminal of the main control unit, which is used to supply power to the main control unit by collecting the leakage current or discharge current of the surge arrester.

[0013] The input terminal of the second power supply circuit is electrically connected to the solar panel, and the output terminal is electrically connected to the second power supply terminal of the main control unit, so as to supply power to the main control unit through the electrical energy converted by the solar panel;

[0014] The input terminal of the third power supply circuit is electrically connected to the battery, and the output terminal is electrically connected to the third power supply terminal of the main control unit, so as to supply power to the main control unit through the electrical energy stored in the battery.

[0015] The input terminal of the fourth power supply circuit is electrically connected to an external power source, and the output terminal is electrically connected to the fourth power supply terminal of the main control unit and the wired communication module, respectively, so as to supply power to the main control unit and the wired communication module respectively through the power provided by the external power source.

[0016] Furthermore, the first power supply circuit includes a nonlinear zinc oxide resistor R1, a current-limiting resistor R2, a bidirectional diode T1, a rectifier bridge, a capacitor C1, a Zener diode D5, and a sampling resistor R3.

[0017] One end of the nonlinear zinc oxide resistor R1 and the current-limiting resistor R2 are both connected to the grounding terminal of the surge arrester. The other end of the current-limiting resistor R2 is simultaneously connected to one end of the bidirectional diode T1 and the high-end input of the rectifier bridge. The other end of the nonlinear zinc oxide resistor R1 is simultaneously grounded, and the other end of the bidirectional diode T1 is connected to the low-end input of the rectifier bridge.

[0018] The high-end output of the rectifier bridge is connected to one end of both capacitor C1 and Zener diode D5. The other end of capacitor C1 and Zener diode D5 is connected to one end of sampling resistor R3 in the main control unit. The low-end output of the rectifier bridge is connected to the other end of sampling resistor R3.

[0019] Furthermore, the rectifier bridge includes diodes D1, D2, D3, and D4;

[0020] The anode of diode D1 and the cathode of diode D3 are simultaneously connected to one end of bidirectional diode T1. The cathode of diode D1 is connected to the cathode of diode D2, and is also connected to one end of capacitor C1 and Zener diode D5. The anode of diode D3 is connected to the anode of diode D4, and is also connected to the other end of sampling resistor R3. The cathode of diode D4 is connected to the anode of diode D2, and is also connected to the other end of bidirectional diode T1.

[0021] Furthermore, the first power supply circuit is integrated inside the main control unit.

[0022] Furthermore, the wireless communication module includes a LoRa communication chip and an antenna electrically connected to the LoRa communication chip;

[0023] The LoRa communication chip is electrically connected to the communication terminal of the main control unit via a serial port, and its power input terminal is electrically connected to the power output terminal of the main control unit; the antenna is wirelessly connected to the external host module.

[0024] Furthermore, the wired communication module includes an RS485 communication chip;

[0025] The input terminal of the RS485 communication chip is electrically connected to the communication terminal of the main control unit, the output terminal is electrically connected to the external host module through an RS485 communication cable, and the power supply terminal is electrically connected to the fourth power supply circuit.

[0026] Furthermore, the RS485 communication chip uses the MAX13485EESA chip.

[0027] The beneficial effects of this utility model are:

[0028] 1. This utility model provides a surge arrester remote transmission meter that simultaneously supports both wired and wireless communication methods. This meter offers at least two advantages: first, when the wired communication method fails, the system can switch the communication mode with the faulty remote transmission meter to wireless, thereby ensuring communication reliability; second, the same type of remote transmission meter can be used to achieve hybrid networking, such as monitoring surge arresters on wind farm transmission lines and surge arresters in wind turbine transformer substations, using wired communication for the surge arresters inside the transformer substations and wireless communication for the surge arresters on the transmission lines.

[0029] 2. This utility model provides four different power supply methods, which can meet the power supply needs of the remote meter in different working modes. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0031] Figure 2 This is a circuit diagram of the first power supply circuit in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, advantages, and features of this utility model clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of a surge arrester remote transmission meter with both wireless and wired communication methods. The advantages and features of this utility model will become clearer according to the following specific embodiments.

[0033] See Figure 1This embodiment describes a surge arrester remote meter with both wireless and wired communication methods, which mainly includes a main control unit, a wireless communication module, a wired communication module, and a power supply module.

[0034] The main control unit specifically adopts a low-power microprocessor, whose input terminal is electrically connected to the ground terminal of the surge arrester to be monitored. The main control unit collects the leakage current and discharge current of the surge arrester to monitor the leakage current and the number of times the surge arrester operates; the ground terminal of the main control unit is grounded.

[0035] Specifically, the power supply module includes a first power supply circuit, a second power supply circuit, a third power supply circuit, a fourth power supply circuit, a solar panel, and a battery.

[0036] The first power supply circuit is integrated inside the main control unit. See details below. Figure 2 The first power supply circuit includes a nonlinear zinc oxide resistor R1, a current-limiting resistor R2, a bidirectional diode T1, a rectifier bridge, a capacitor C1, a Zener diode D5, and a sampling resistor R3. One end of the nonlinear zinc oxide resistor R1 and the current-limiting resistor R2 serves as the input terminal of the first power supply circuit and is also connected to the ground terminal of the surge arrester. The other end of the current-limiting resistor R2 is connected to one end of the bidirectional diode T1 and the high-side input of the rectifier bridge. The other end of the nonlinear zinc oxide resistor R1 is grounded, and the other end of the bidirectional diode T1 is connected to the low-side input of the rectifier bridge. The high-side output of the rectifier bridge is connected to one end of the capacitor C1 and the Zener diode D5. The other end of the capacitor C1 and the Zener diode D5 is connected to one end of the sampling resistor R3 in the main control unit. The low-side output of the rectifier bridge is connected to the other end of the sampling resistor R3 in the main control unit. The main control unit is powered by collecting the leakage current or discharge current of the surge arrester.

[0037] More specifically, the rectifier bridge includes diodes D1, D2, D3, and D4; the anode of diode D1 and the cathode of diode D3 are simultaneously connected to one end of bidirectional diode T1; the cathode of diode D1 is connected to the cathode of diode D2, and simultaneously connected to one end of capacitor C1 and Zener diode D5; the anode of diode D3 is connected to the anode of diode D4, and simultaneously connected to the other end of sampling resistor R3; the cathode of diode D4 is connected to the anode of diode D2, and simultaneously connected to the other end of bidirectional diode T1.

[0038] The input of the second power supply circuit is electrically connected to the solar panel, and the output is electrically connected to the second power supply terminal of the main control unit. The power supply is powered by the electrical energy converted by the solar panel. The input of the third power supply circuit is electrically connected to the battery (such as the high-energy battery ER14505), and the output is electrically connected to the third power supply terminal of the main control unit. The power supply is powered by the electrical energy stored in the battery. The input of the fourth power supply circuit is electrically connected to an external power source, and the output is electrically connected to the fourth power supply terminal of the main control unit and the wired communication module, respectively. The power supply is powered by the electrical energy provided by the external power source for both the main control unit and the wired communication module.

[0039] The second, third, and fourth power supply circuits not mentioned in this embodiment are all existing technologies and can be designed with reference to relevant literature.

[0040] The wireless communication module includes a LoRa communication chip and an antenna electrically connected to the LoRa communication chip. The LoRa communication chip is electrically connected to the communication terminal of the main control unit via a serial port, and its power input terminal is electrically connected to the power output terminal of the main control unit. The antenna is wirelessly connected to an external host module, and transmits the surge arrester leakage current and operation count information output by the main control unit to the host module via wireless communication.

[0041] The wired communication module includes an RS485 communication chip, specifically the MAX13485EESA chip. The input terminal of the RS485 communication chip is electrically connected to the communication terminal (USART pin of the microprocessor) of the main control unit, and the output terminal is electrically connected to an external host module via an RS485 communication cable. The surge arrester leakage current and operation count information output by the main control unit are transmitted to the host module via the RS485 communication cable. The power supply terminal of the RS485 communication chip is electrically connected to the fourth power supply circuit.

[0042] When only the third power supply circuit supplies power to the main control unit, the main control unit operates in a low-power sleep mode, periodically waking up to monitor leakage current and the number of actions. At this time, only data monitoring is performed; data transmission is not performed remotely.

[0043] When the first or second power supply circuit supplies power to the main control unit, and the fourth power supply circuit does not supply power, the main control unit operates in a low-power sleep mode, periodically waking up to monitor leakage current and the number of operations. Then, the main control unit supplies power to the wireless communication module, thus starting the wireless communication module. Next, it sends the data to be transmitted remotely to the wireless communication module via a serial port, and the wireless communication module sends the data to the host module. After transmission is complete, the main control unit cuts off the power supply to the wireless communication module, thus shutting it down. Finally, the main control unit enters sleep mode, waiting for the next wake-up.

[0044] When the fourth power supply circuit powers the main control unit and the wired communication module, the main control unit initially operates in low-power sleep mode. The USART pin connected to the fourth power supply circuit is set to fall-edge interrupt wake-up mode. When a message is transmitted on the RS485 communication cable, the level change during message transmission is transmitted to the USART pin of the main control unit through the wired communication module. After triggering an interrupt, the microprocessor of the main control unit switches to operating mode and starts the USART communication function on the pin connected to the wired communication module. Then, it monitors the leakage current and number of operations of the surge arrester and sends the monitoring data to the upper module through the wired and wireless communication modules. If, in operating mode, the main control unit does not receive any messages from the wired communication module for an extended period (e.g., 5 minutes), the main control unit returns to low-power mode.

Claims

1. A remote meter for surge arresters with both wireless and wired communication capabilities, characterized in that: It includes a main control unit, a wireless communication module, a wired communication module, and a power supply module; The input terminal of the main control unit is electrically connected to the grounding terminal of the surge arrester to be monitored, and is used to collect the leakage current and discharge current of the surge arrester in order to monitor the leakage current and the number of times the surge arrester operates; the grounding terminal of the main control unit is grounded. The input terminals of the wireless communication module and the wired communication module are electrically connected to the communication terminal of the main control unit, and the output terminals are wirelessly and electrically connected to the external host module, respectively, to send the surge arrester leakage current and operation number information output by the main control unit to the host module. The power supply module includes a first power supply circuit, a second power supply circuit, a third power supply circuit, a fourth power supply circuit, a solar panel, and a battery; The input terminal of the first power supply circuit is electrically connected to the grounding terminal of the surge arrester to be monitored, and the output terminal is electrically connected to the first power supply terminal of the main control unit, which is used to supply power to the main control unit by collecting the leakage current or discharge current of the surge arrester. The input terminal of the second power supply circuit is electrically connected to the solar panel, and the output terminal is electrically connected to the second power supply terminal of the main control unit, so as to supply power to the main control unit through the electrical energy converted by the solar panel; The input terminal of the third power supply circuit is electrically connected to the battery, and the output terminal is electrically connected to the third power supply terminal of the main control unit, so as to supply power to the main control unit through the electrical energy stored in the battery. The input terminal of the fourth power supply circuit is electrically connected to an external power source, and the output terminal is electrically connected to the fourth power supply terminal of the main control unit and the wired communication module, respectively, so as to supply power to the main control unit and the wired communication module respectively through the power provided by the external power source.

2. A surge arrester remote meter with wireless and wired communication methods according to claim 1, characterized in that: The first power supply circuit includes a nonlinear zinc oxide resistor R1, a current-limiting resistor R2, a bidirectional diode T1, a rectifier bridge, a capacitor C1, and a Zener diode D5; One end of the nonlinear zinc oxide resistor R1 and the current-limiting resistor R2 are both connected to the grounding terminal of the surge arrester. The other end of the current-limiting resistor R2 is simultaneously connected to one end of the bidirectional diode T1 and the high-end input of the rectifier bridge. The other end of the nonlinear zinc oxide resistor R1 is simultaneously grounded, and the other end of the bidirectional diode T1 is connected to the low-end input of the rectifier bridge. The high-end output of the rectifier bridge is connected to one end of both capacitor C1 and Zener diode D5. The other end of capacitor C1 and Zener diode D5 is connected to one end of sampling resistor R3 in the main control unit. The low-end output of the rectifier bridge is connected to the other end of sampling resistor R3 in the main control unit.

3. A surge arrester remote meter with wireless and wired communication methods according to claim 2, characterized in that: The rectifier bridge includes diodes D1, D2, D3, and D4; The anode of diode D1 and the cathode of diode D3 are simultaneously connected to one end of bidirectional diode T1. The cathode of diode D1 is connected to the cathode of diode D2, and is also connected to one end of capacitor C1 and Zener diode D5. The anode of diode D3 is connected to the anode of diode D4, and is also connected to the other end of sampling resistor R3. The cathode of diode D4 is connected to the anode of diode D2, and is also connected to the other end of bidirectional diode T1.

4. A surge arrester remote meter with wireless and wired communication methods according to claim 3, characterized in that: The first power supply circuit is integrated inside the main control unit.

5. A surge arrester remote meter with wireless and wired communication methods according to any one of claims 1-4, characterized in that: The wireless communication module includes a LoRa communication chip and an antenna electrically connected to the LoRa communication chip. The Lora communication chip is electrically connected to the communication terminal of the main control unit via a serial port, and its power input terminal is electrically connected to the power output terminal of the main control unit; the antenna is wirelessly connected to the external host module.

6. A surge arrester remote meter with wireless and wired communication methods according to claim 5, characterized in that: The wired communication module includes an RS485 communication chip; The input terminal of the RS485 communication chip is electrically connected to the communication terminal of the main control unit, the output terminal is electrically connected to the external host module through an RS485 communication cable, and the power supply terminal is electrically connected to the fourth power supply circuit.

7. A surge arrester remote meter with wireless and wired communication methods according to claim 6, characterized in that: The RS485 communication chip used is the MAX13485EESA chip.

Images