Fault indicator using lora communication

Abstract

The utility model provides a fault indicator using lora communication. The fault indicator comprises a control unit, and a permalloy power taking circuit, a Rogowski coil sampling circuit, a LoRA module circuit, an LED control circuit and other auxiliary circuits which are all in communication connection with the control unit. The other auxiliary circuits comprise a watchdog circuit, a turning circuit and an electric field sampling circuit, and the watchdog circuit, the turning circuit and the electric field sampling circuit are all in communication connection with the control unit. The fault indicator has the beneficial effects that the fault indicator selects the 255MESH lora module, and the self-routing function of the 255MESH lora module is utilized to enable the node to automatically calculate the routing, so that the dependence on the central node is reduced, and the flexibility and the reliability of the network are improved; the power consumption is reduced by applying multiple dormancy mechanisms, the system adapts to different application scenes, the communication distance can be greatly increased, the anti-interference capability is enhanced, and the system also has an expansion function and flexibility.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of fault indicator, especially a kind of fault indicator using lora communication. BACKGROUND

[0002] Fault indicator is crucial to the real-time monitoring of distribution line in power system, can find short circuit, grounding and other faults and line operating state in time, and indicate fault by local flip, flashing and other ways, simultaneously upload fault information wirelessly.However, current fault indicator has many problems.For example, the actual communication distance of existing 433 communication module (such as SX1212 and A7139) is short, only about 50 meters.

[0003] In the aspect of long-distance communication, existing technology faces challenges.For example, long-distance indicator is developed to meet the demand of Gansu region overhead external signal type remote fault indicator popularization and anti-fire project, but the transmission distance of A7129 chip used before is short, which cannot meet the communication distance requirement of more than 1km when used with FTU.

[0004] Existing fault indicator communication module and distance condition:

[0005] 433 communication module: A7139 wireless transceiver module used in high-precision fault indicator and SX1212 radio frequency module used in new shell prototype, although the theoretical communication distance is far, but the actual test is only about 50 meters.Such as SX1212 module working frequency band is 410-438MHz, transmitting current 35mA, receiving current 3mA, sleep current 4uA, maximum transmitting power 12.5dBm, receiving sensitivity -104dBm@1kbps, reference distance 1000m;A7139 chip open distance 1200m, but the actual use effect is not good, the main reason is that it belongs to self CPU control communication, which is not encapsulated protocol stack, and it is difficult to network interconnection.

[0006] Lora module: Lora is suitable for long-distance communication and large-scale connection scenarios, such as Internet of Things remote monitoring and smart city, its transmission range can reach 3 miles (4.7 kilometers) in urban area and more than 10 miles (16 kilometers) in rural area;ZigBee is suitable for short-distance communication and low-power application, such as smart home and industrial automation, transmission distance is 10-75m, which can continue to increase, working frequency band is 2.4GHz (global popular), 868MHz (Europe popular) and 915MHz (America popular), transmission rate is highest 250kbit / s, 20kbit / s and 40kbit / s respectively.

[0007] Background of the demand: The production center, in response to the demand for overhead signal-type remote fault indicators in Gansu Province and the decision made during the assessment of wildfire prevention projects, decided to develop a long-distance indicator. The existing A7129 chip, with its low power consumption characteristics, has a short transmission distance of only about 50 meters, which cannot meet the communication distance requirement of more than 1 kilometer when the indicator is used in conjunction with an FTU. Utility Model Content

[0008] In view of this, the present invention aims to provide a fault indicator using LoRa communication to solve at least one of the problems existing in the prior art.

[0009] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0010] A fault indicator using LoRA communication includes a control unit and a permalloy power supply circuit, a Rogowski coil sampling circuit, a LoRA module circuit, an LED control circuit, and other auxiliary circuits, all of which are communicatively connected to the control unit. The other auxiliary circuits include a watchdog circuit, a flip-card circuit, and an electric field sampling circuit, all of which are communicatively connected to the control unit.

[0011] Furthermore, the permalloy power-generating circuit includes several resistors, capacitors, diodes, and a chip HT. It uses permalloy power to induce AC power from the bus, which is then rectified, filtered, and converted into DC voltage to power the equipment.

[0012] Furthermore, the Rogowski coil sampling circuit includes several resistors, several capacitors, and three amplifiers, which are connected to the control unit via a three-stage amplifier circuit; wherein the three amplifiers amplify the signal by 49 times, 49 times, and 6 times, respectively.

[0013] Furthermore, the LoRA module circuit includes a resistor, a MOSFET, a capacitor, and an interface, with the resistor and capacitor both connected to the MOSFET.

[0014] Furthermore, the watchdog circuit includes resistor R35, capacitor C35, diode D4, diode D5, capacitor C19, capacitor C31, resistor R34, chip U4A, resistor R33, chip U4B, capacitor C30, and resistor R36. Resistor R35 is connected to diodes D4 and D5 through capacitor C35. Capacitor C19 is connected to +3.3V. Diode D5 is connected to one end of capacitor C31 and resistor R34. Both capacitor C31 and resistor R34 are connected to pins of chip U4A. Pins of chip U4A are also connected to resistor R33, chip U4B, and capacitor C30. Pins of chip U4B are also connected to resistors R33 and R36.

[0015] Further, the card turning circuit includes three resistors, a MOS tube, a bridge circuit and two capacitors, the MOS tube is connected with the two resistors respectively, and the MOS tube is connected with the bridge circuit, the two capacitors and a resistor through a resistor respectively.

[0016] Further, the electric field sampling circuit includes two capacitors, three resistors and an IGBT device, the G electrode of the IGBT device is connected with the two resistors respectively, one of the resistors is also connected with one of the capacitors, the G electrode of the IGBT device is also connected with a resistor, and one end of the resistor is connected with one of the capacitors.

[0017] Compared with the prior art, the fault indicator using lora communication has the following advantages:

[0018] The fault indicator using lora communication has the following advantages: BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide further understanding of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0020] Figure 1 The fault indicator principle schematic diagram is described in the embodiments of the present application;

[0021] Figure 2 The control unit schematic diagram is described in the embodiments of the present application;

[0022] Figure 3 The permalloy power taking circuit schematic diagram is described in the embodiments of the present application;

[0023] Figure 4 The Rogowski coil sampling circuit schematic diagram is described in the embodiments of the present application;

[0024] Figure 5 The LoRA module circuit schematic diagram is described in the embodiments of the present application;

[0025] Figure 6 The watchdog circuit schematic diagram is described in the embodiments of the present application;

[0026] Figure 7 The card turning circuit schematic diagram is described in the embodiments of the present application;

[0027] Figure 8 The electric field sampling circuit schematic diagram is used for the embodiment of the utility model. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0029] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0031] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] As Figures 1 to 8 As shown in a kind of failure indicator using lora communication, including control unit and the other auxiliary circuit of permalloy power taking circuit, LoRa coil sampling circuit, LoRA module circuit, LED control circuit and being communicated connection with it;The other auxiliary circuit includes watchdog circuit, flip circuit and electric field sampling circuit, the watchdog circuit, flip circuit and electric field sampling circuit are all communicated connection with control unit, through the cooperative work of each part of failure indicator, realize the functions such as the failure monitoring of distribution line, alarm, data transmission and the stable operation of system.

[0033] The fault indicator selects 255MESH lora module, utilizes the self-routing function to let the node calculate the route by itself, reduces the dependence on the center node, improves the network flexibility and reliability, utilizes various sleep mechanisms to reduce the power consumption, adapts to different application scenes, can greatly improve the communication distance, enhances the anti-interference ability, and has expansion function and flexibility.

[0034] In a preferred embodiment of the utility model, the control unit: through comprehensive cost performance, low power consumption, function requirement and the like, selects STM32L431CBT6 master control chip as the indicator control unit.

[0035] In a preferred embodiment of the utility model, the slope alloy power taking circuit includes a plurality of resistors, capacitors, diodes and chip HT, adopts the slope alloy power taking mode, inducts alternating current electric energy from the bus, is rectified and filtered and power conversion into direct current voltage, and the equipment is powered, and when VCC is 3V, the relationship of current and power taking capacity is shown in the following table 1.

[0036] Table 1

[0037] Load current VCC line current 5A 1.8 mA 10A 5.7 mA 15A 7.1 mA 20A 9.05 mA 40A 12.6 mA 80A 15.8 mA 160A 18 mA 200A 18.6 mA 400A 20.9 mA 600A 23 mA

[0038] In a preferred embodiment of the utility model, the Rogowski coil sampling circuit includes a plurality of resistors, a plurality of capacitors and three amplifiers, is connected with the control unit through three amplifier circuits, specifically, the Rogowski coil collects current signals, enters the control unit MCU detection port after amplification, is used for large and small current detection, to ensure the current sampling accuracy.

[0039] Specifically, after the Rogowski coil input is lifted 1.25V and is amplified 49 times, enters the MCU detection port, is used for the detection signal of large current, after 49 times amplification, enters the MCU detection port again after 6 times amplification, is used for the detection signal of small current, to ensure the accuracy of current sampling.

[0040] In a preferred embodiment of the utility model, the LoRA module circuit includes a resistor, a MOS tube, a capacitor and an interface, the resistor and the capacitor are connected with the MOS tube, so that the LoRA module circuit power can be controlled by the mos tube to be turned on, to ensure that the power consumption of the module is always kept at a low level, for realizing long-distance wireless communication function.

[0041] In a preferred embodiment of the utility model, the watchdog circuit includes resistance R35, capacitor C35, diode D4, diode D5, capacitor C19, capacitor C31, resistance R34, chip U4A, resistance R33, chip U4B, capacitor C30 and resistance R36;The resistance R35 is connected with diode D4 and diode D5 through capacitor C35 respectively, capacitor C19 is connected with +3.3V, diode D5 is connected with capacitor C31 and one end of resistance R34 respectively, capacitor C31 and resistance R34 are both connected with the pin of chip U4A, the pin of chip U4A is also connected with resistance R33, chip U4B and capacitor C30 respectively, the pin of chip U4B is also connected with resistance R33 and resistance R36, and the system is restarted when the fault indicator has a problem, so that the reliable operation of the product is guaranteed.

[0042] In a preferred embodiment of the utility model, the card turning circuit includes three resistors, an MOS tube, a bridge circuit and two capacitors, the MOS tube is connected with two resistors respectively, the MOS tube is connected with the bridge circuit, two capacitors and a resistor through a resistor respectively, in actual use, the bridge card turning circuit is adopted, the normal operation of card turning is guaranteed, and the fault indication function is realized.

[0043] In a preferred embodiment of the utility model, the electric field sampling circuit includes two capacitors, three resistors and an IGBT device, the G pole of the IGBT device is connected with two resistors respectively, one of the resistors is also connected with a capacitor, the G pole of the IGBT device is also connected with a resistor, one end of a resistor is connected with a capacitor, and the electric field sampling circuit can effectively detect the electric field intensity.

[0044] In a preferred embodiment of the utility model, the main control chip is connected with each circuit.

[0045] 1.Permalloy power supply circuit: provides power support for the entire system, the output DC voltage is connected to the main control chip STM32L431CBT6, ensures the normal work of the chip, and also powers other circuit modules, and is the energy source for the operation of the entire system.

[0046] 2.Rogowski coil sampling circuit: the current signal collected by the Rogowski coil enters the AD detection port of the main control chip after processing, so that the main control chip can obtain current information, which is used to realize the monitoring of the current of the power distribution line, so as to perform subsequent fault judgment and other operations.

[0047] 3.LoRA module circuit: connected with the main control chip through a specific interface, the main control chip controls the power of the Lora module to be turned on, and interacts with the Lora module, realizes the long-distance wireless communication function, and transmits the collected fault information and other data to the forwarding station or receives the control instruction.

[0048] 4. Other auxiliary circuits

[0049] 1) watchdog circuit: connected with the main control chip, real-time monitoring software running state, when the software problem or run, send reset signal to the main control chip, make the system restart, ensure the reliable operation of the product.

[0050] 2) flip circuit: receiving the control signal of the main control chip, according to the fault state, flip the card operation, realize the intuitive indication of the fault, tell the line fault situation to the operation and maintenance personnel.

[0051] 3) electric field sampling circuit: the detected electric field intensity signal is transmitted to the main control chip, and the main control chip can obtain the related environmental information according to the signal, assist in judging the line state or carrying out other related operations.

[0052] It should be noted that the present application only improves the structure of the detection tool, and does not improve the control program, and the control program and electrical devices involved are prior art.

[0053] The above only describes the preferred embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fault indicator using LoRa communication, characterized in that: It includes a control unit and a permalloy power supply circuit, a Rogowski coil sampling circuit, a LoRA module circuit, an LED control circuit, and other auxiliary circuits, all of which are communicatively connected to the control unit. The other auxiliary circuits include a watchdog circuit, a flip-card circuit, and an electric field sampling circuit, all of which are communicatively connected to the control unit.

2. A fault indicator using LoRa communication according to claim 1, characterized in that: The permalloy power supply circuit includes several resistors, capacitors, diodes, and a chip HT. It uses permalloy to draw AC power from the bus, which is then rectified, filtered, and converted into DC voltage to power the equipment.

3. A fault indicator using LoRa communication according to claim 1, characterized in that: The Rogowski coil sampling circuit includes several resistors, several capacitors, and three amplifiers, which are connected to the control unit via a three-stage amplifier circuit; the three amplifiers amplify the signal by 49 times, 49 times, and 6 times, respectively.

4. A fault indicator using LoRa communication according to claim 1, characterized in that: The LoRA module circuit includes a resistor, a MOSFET, a capacitor, and an interface. The resistor and capacitor are both connected to the MOSFET.

5. A fault indicator using LoRa communication according to claim 1, characterized in that: The watchdog circuit includes resistor R35, capacitor C35, diode D4, diode D5, capacitor C19, capacitor C31, resistor R34, chip U4A, resistor R33, chip U4B, capacitor C30, and resistor R36. Resistor R35 is connected to diodes D4 and D5 through capacitor C35. Capacitor C19 is connected to +3.3V. Diode D5 is connected to one end of capacitor C31 and resistor R34. Both capacitor C31 and resistor R34 are connected to pins of chip U4A. Pins of chip U4A are also connected to resistor R33, chip U4B, and capacitor C30. Pins of chip U4B are also connected to resistors R33 and R36.

6. A fault indicator using LoRa communication according to claim 1, characterized in that: The flip-card circuit includes three resistors, one MOSFET, a bridge circuit, and two capacitors. The MOSFET is connected to two resistors, and the MOSFET is connected to the bridge circuit, two capacitors, and one resistor through a resistor.

7. A fault indicator using LoRa communication according to claim 1, characterized in that: The electric field sampling circuit includes two capacitors, three resistors, and an IGBT device. The gate (G) of the IGBT device is connected to two resistors, one of which is also connected to a capacitor. The gate (G) of the IGBT device is also connected to a resistor, and one end of the resistor is connected to a capacitor.

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