Self-power-taking open-close type wireless current sensor

Abstract

The utility model belongs to the technical field of power monitoring and sensors, and provides a self-power-taking open-close type wireless current sensor, which comprises a shell, the shell comprises an upper half shell, a lower half shell and a main control shell, the upper half shell is rotatably connected to one side of the lower half shell, the other side of the upper half shell is fixedly provided with a buckle, and the main control shell is fixedly connected with the lower half shell. The upper half shell and the lower half shell are clamped with a clamping sleeve of the lower half shell, and a semicircular energy taking coil and a semicircular sampling coil are respectively arranged in the upper half shell and the lower half shell; the main control shell is connected with the lower half shell in a clamped mode, a current sampling module and a power module are arranged in the main control shell, the power module is connected with the energy taking coil, and the current sampling module is connected with the sampling coil. According to the overall structure, through the design of self-power-taking and the addition of a wireless function, self-power-supply is achieved so that the sensor can be suitable for more and wider use scenes, the characteristic effect of being portable, stored and carried is achieved through wireless, and the practicability of the sensor is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of power monitoring and sensor technology, specifically relating to a self-powered open-close wireless current sensor. Background Technology

[0002] Current transformers are sensors that enable secondary equipment such as measuring instruments and relay protection devices in power systems to obtain primary circuit current information. They are crucial electrical devices in power systems, performing the functions of isolation between high and low voltage systems and converting high-voltage quantities to low-voltage quantities. The proper functioning of the current transformer itself is of paramount importance to the safety of the power system and the normal operation of protection and measurement equipment. Currently, existing current sensors have many problems in practical applications: some sensors are inconvenient to install, requiring power outages and affecting the normal operation of the power system; some sensors have limited functionality, only detecting one parameter, either current or temperature; and some sensors have complex power supply methods, limiting their use in outdoor areas with inconvenient power supply, and their data transmission stability is poor, failing to meet the power system's requirements for real-time and accurate line monitoring. Utility Model Content

[0003] The technical problem this invention aims to solve is to provide a self-powered, switchable wireless current sensor for monitoring multiple parameters of lines with voltage levels of 10kV and below. It addresses the technical problems of existing technologies, such as installation during power outages, detection of only one parameter (current or temperature), and complex and limited power supply methods. By integrating the current sensor design, it achieves functional integration of a current transformer, power supply, measuring instrument, and communication terminal, significantly reducing the sensor's size and weight, simplifying the architecture of the power monitoring system, lowering equipment and installation costs, and reducing maintenance complexity.

[0004] To solve the above-mentioned technical problems, the present invention provides a self-powered openable wireless current sensor, including a housing, the housing comprising an upper half-shell, a lower half-shell and a main control housing, the upper half-shell being rotatably connected to one side of the lower half-shell, and a buckle being fixedly provided on the other side of the upper half-shell, engaging with the lower half-shell in a snap-fit ​​manner; a semi-annular energy harvesting coil and a sampling coil are respectively provided inside the upper half-shell and the lower half-shell.

[0005] The main control housing is engaged with the lower housing. The main control housing contains a current sampling module and a power supply module. The power supply module is connected to the energy harvesting coil via wires and supplies power to the current sampling module. The current sampling module is connected to the sampling coil.

[0006] The upper housing is provided with a spring clamp that moves between the upper and lower housings. The spring clamp includes a spring installed in the upper housing and a clamp. The spring is used to elastically drive the clamp to press against the surface of the cable to be tested.

[0007] A temperature sensor is installed inside the lower half of the housing. The temperature sensor is correspondingly installed with the spring clamp and is connected to the current sampling module.

[0008] The main control housing contains a wireless transmission module, which is connected to the current sampling module. The wireless transmission module is used to transmit the current and temperature information extracted by the sensor to the main control monitoring computer.

[0009] The main control housing is also equipped with a reserved communication interface for transmitting signals to the main control monitoring computer.

[0010] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0011] This invention features a separate upper and lower housing that is secured with snap-fit ​​fasteners, allowing the sensor to be installed and tested without power interruption. The energy-harvesting coils within the upper and lower housings enable the sensor to adapt to a wider range of scenarios. Additionally, the spring clamp ensures the temperature sensor is in close contact with the surface of the cable being tested, enabling more accurate temperature detection. The overall structure, through its self-powered design and the addition of wireless functionality, achieves self-powered operation for a wider range of applications. Furthermore, the wireless feature enhances portability and storage, further improving the sensor's practicality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0014] Figure 3 This is a side view of the present invention.

[0015] Figure 4 This is a schematic diagram of the spring clamp in this utility model;

[0016] Figure 5 This is the circuit diagram of the practical current acquisition module;

[0017] Figure 6 This is the circuit diagram of the practical wireless transmitter module.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Upper housing; 2. Lower housing; 3. Main control housing; 4. Power harvesting coil; 5. Sampling coil; 6. Buckle; 7. Spring clamp; 71. Spring; 72. Clamp; 8. Current sampling module; 9. Power supply module; 10. Wireless transmission module; 11. Temperature sensor. Detailed Implementation

[0020] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 1-3 As shown, an embodiment of this utility model provides a self-powered switching wireless current sensor for monitoring various parameters of lines with voltage levels of 10kV and below. The sensor includes a housing, which comprises an upper housing 1, a lower housing 2, and a main control housing 3. A semi-annular energy harvesting coil 4 and a sampling coil are respectively installed inside the upper housing 1 and the lower housing 2. The energy harvesting coil 4 supplies power to the power module 9, reducing the need for wires or energy storage units.

[0022] The upper housing 1 is rotatably connected to one side of the lower housing 2. A buckle 6 is fixedly provided on the other side of the upper housing 1 and engages with the lower housing 2. This allows the sensor to be securely installed on the power line without power interruption, through the opening and closing coil and the buckle. This installation method is applicable to different application scenarios and greatly improves construction efficiency.

[0023] like Figure 4 As shown, a spring clamp 7 is provided inside the upper housing 1, movable between the upper housing 1 and the lower housing 2. The spring clamp 7 includes a spring 71 and a clamp 72 installed inside the upper housing 1. The spring 71 is used to elastically drive the clamp 72 to press against the surface of the cable to be tested. A temperature sensor 11 is provided inside the lower housing 2, and the temperature sensor 11 is correspondingly arranged with the clamp 72. The spring clamp can be quickly installed without additional tools, is suitable for confined spaces or dense wire harness environments, has adjustable spring force to adapt to different wire diameters, and ensures measurement stability. When closed, the upper housing is pressed down, and the clamp is pressed tightly against the cable surface by the spring force, ensuring full coupling between the energy harvesting coil and the sampling coil and the cable.

[0024] The main control housing 3 is fixedly connected to the lower housing 2. The main control housing 3 houses a current sampling module 8, a power supply module 9, and a wireless transmission module 10. The power supply module 9 is connected to the energy harvesting coil 4 and supplies power to the current sampling module 8 and the wireless transmission module 10 via wires. Under normal circumstances, the power supply module draws power from a through-core wire to power the current sampling module. Additionally, this embodiment includes a lithium battery, which provides short-term emergency power when the power supply module fails to draw power. The current sampling module 8 is connected to the sampling coil and temperature sensor 10 to collect and process the current and temperature signals of the cable under test. It can operate stably under different environmental conditions, accurately collecting the current value of the main circuit and the temperature value of the monitoring point in real time.

[0025] The wireless transmission module 10 transmits the current information collected by the current sampling module 8 and the temperature information collected by the temperature sensor 11 to the main control and monitoring computer. In this embodiment, the wireless transmission module adopts a low-power, high-stability wireless communication protocol to ensure efficient and reliable data transmission between the sensor and the concentrator. The concentrator is equipped with an RS485 communication interface and supports the Modbus RTU communication protocol, which enables the concentrator to easily communicate with gateways, host computers, or other intelligent devices, thereby realizing remote data transmission and control. The adoption of this wireless communication method not only improves the flexibility of data transmission but also enhances the scalability of the system.

[0026] The working principle of this utility model is as follows:

[0027] During installation, open the sensor's hinged housing and align it with the target line with a voltage level of 10kV or below. Close the upper and lower housings around the line and secure them with the snap-fit ​​mechanism. Ensure the power-taking capacitor is electrically connected to the line. After installation, the sensor will automatically start drawing power and enter working mode.

[0028] During operation, the current sampling module and temperature sensor continuously collect data. The collected data is then transmitted to the concentrator by the wireless transmission module according to the set wireless communication protocol. Upon receiving the data, the concentrator transmits the data to the gateway, host computer, or other intelligent devices via the RS485 communication interface and Modbus RTU communication protocol. Users can view the line current and temperature data in real time through these devices, enabling remote monitoring and management of power lines. This invention is applicable to lines with voltage levels of 10kV and below. It features a snap-on live installation method, integrating the temperature sensor, current sampling, wireless transmission, and installation components into a single structure. It collects the main circuit current and monitoring point temperature, directly converting them into digital quantities, and communicates with the concentrator via wireless communication protocol. The concentrator has an RS485 communication interface and supports Modbus RTU communication protocol to communicate with the gateway, host computer, or other intelligent devices, enabling the forwarding of collected current and temperature values. Compared with existing product solutions, the size and weight are significantly reduced, achieving a completely new integrated design of the functions of four independent products: current transformer, power supply, measuring instrument, and communication terminal, resulting in a unified small intelligent sensor.

[0029] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A self-powered, switchable wireless current sensor, comprising a housing, characterized in that, The outer casing includes an upper shell, a lower shell, and a main control shell. The upper shell is rotatably connected to one side of the lower shell. A buckle is fixedly provided on the other side of the upper shell and engages with the lower shell. A semi-annular energy harvesting coil and a sampling coil are respectively provided inside the upper shell and the lower shell. The main control housing is engaged with the lower housing. The main control housing contains a current sampling module and a power supply module. The power supply module is connected to the energy harvesting coil via wires and supplies power to the current sampling module. The current sampling module is connected to the sampling coil.

2. The self-powered switching wireless current sensor according to claim 1, characterized in that, The upper housing is provided with a spring clamp that moves between the upper housing and the lower housing. The spring clamp includes a spring installed in the upper housing and a clamp. The spring is used to elastically drive the clamp to press against the surface of the cable to be tested.

3. The self-powered switching wireless current sensor according to claim 1, characterized in that, A temperature sensor is installed inside the lower half of the housing, and the temperature sensor is connected to the current sampling module.

4. The self-powered switching wireless current sensor according to claim 1, characterized in that, The main control housing contains a wireless transmission module, which is connected to the current sampling module.

5. The self-powered switching wireless current sensor according to claim 1, characterized in that, The main control housing is also provided with a reserved communication interface for transmitting signals to the main control monitoring computer.

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