FTU with lightning arrester or insulator leakage current monitoring function

Abstract

The utility model provides an FTU with a lightning arrester or insulator leakage current monitoring function, comprising a current sensor connected with a lightning arrester or an insulator, the current sensor is electrically connected with a signal processing circuit, the signal processing circuit is electrically connected with a control module, and the control module is electrically connected with the lightning arrester or the insulator. The control module is electrically connected with the telemetering module, the remote control module, the power supply module, the remote signaling module and the image sensor, the remote signaling module is electrically connected with the router, and the router is electrically connected with the server and the work station. According to the utility model, the leakage current of a lightning arrester or an insulator can be monitored, the three-remote function of the FTU is integrated, maintenance personnel can conveniently know the field condition by collecting the field image information of a power transmission line, all monitoring and control information is sent to the router through a wireless network, and the monitoring and control functions of the power transmission line are greatly improved. And finally, remote monitoring is realized through the server and the work station, so that the safety of the power transmission line and the inspection efficiency are improved.

Description

Technical Field

[0001] The utility model and the technical field of power distribution monitoring specifically relate to an FTU with a lightning arrester or insulator leakage current monitoring function. Background Art

[0002] Insulators are devices installed between conductors of different potentials or between conductors and grounded components, which can withstand voltage and mechanical stress. There are many types of insulators with different shapes. Although the structures and appearances of different types of insulators are quite different, they are all composed of two major parts: insulating parts and connecting fittings. Insulators are usually made of glass or ceramics, and play an important role in supporting conductors and preventing current from returning to the ground in overhead transmission lines. When the humidity of the on-site environment changes, there is too much dirt on the surface of the insulator, the insulator is covered with ice, and the zero-value insulator is present, the leakage current of the insulator will increase. Insulator leakage current generally does not cause serious electrical fires, but it will cause equipment failures and safety hazards, and may further cause serious consequences such as fires and explosions. If the discharge of insulators is not discovered and controlled in time, it may cause irreparable losses.

[0003] Lightning arrester is an important device used to protect the power system. It is mainly used to protect various electrical equipment and key equipment such as cables, transformers, relays in the power system from damage caused by overvoltage such as lightning strikes and voltage spikes. When the arrester is not working normally, that is, when it is under normal working voltage, a small current value called "leakage current" will appear. Leakage current refers to the weak current caused by defects in the microstructure of the material or ion pollution when the arrester is not powered or discharged. Under normal circumstances, the leakage current of the arrester should be less than 0.5 milliamperes (mA), which is required by national standards and industry specifications. If the leakage current of the arrester exceeds 0.5mA, it indicates a series of problems such as aperture pollution, surface moisture, aging of the protective layer, and damage to the insulation structure. The protective effect of the arrester will be seriously affected, which may cause damage to the power system and related equipment.

[0004] How to effectively monitor the leakage current of lightning arresters or insulators and take measures to reduce or avoid the above-mentioned adverse effects is a key link in improving the safe and stable operation of the power grid. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a FTU with a lightning arrester or insulator leakage current monitoring function to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] An FTU with a lightning arrester or insulator leakage current monitoring function comprises: a current sensor connected to the lightning arrester or insulator, the current sensor is electrically connected to a signal processing circuit, the signal processing circuit is electrically connected to a control module, the control module is electrically connected to a telemetry module, a remote control module, a power module, a remote signaling module, and an image sensor, the remote signaling module is electrically connected to a router, and the router is electrically connected to a server and a workstation.

[0008] Preferably, the current sensor adopts a split-type current transformer.

[0009] Preferably, the telemetry module is an ATT7022B power collection chip.

[0010] Preferably, the signal processing circuit includes a resistor adopting circuit, an RC filtering circuit and an operational amplifier circuit which are connected in sequence.

[0011] Preferably, the remote control module is a 433M wireless radio frequency chip.

[0012] Preferably, the control module is an MSP430 series single chip microcomputer.

[0013] Preferably, the power supply module is a low-voltage DC regulated power supply.

[0014] Preferably, the remote signal module is a 4G / 5G module, a LORA module or a NB-IoT module.

[0015] Preferably, the workstation is an industrial computer.

[0016] Preferably, the image sensor is a camera with a night vision function.

[0017] The beneficial effects of the above technical solution of the utility model are as follows:

[0018] The utility model can monitor the leakage current of the arrester or insulator, and integrate the "three remote" functions of FTU. At the same time, it is convenient for maintenance personnel to understand the on-site conditions by collecting on-site image information of the transmission line. All monitoring and control information is sent to the router through the wireless network, and finally remote monitoring is realized through the server and workstation, thereby improving the safety of the transmission line and the efficiency of inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall principle block diagram of the FTU with arrester or insulator leakage current monitoring function of the utility model;

[0020] Figure 2 The utility model is a signal processing circuit schematic diagram of the FTU with the function of monitoring the leakage current of the lightning arrester or insulator. DETAILED DESCRIPTION

[0021] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, an FTU with a lightning arrester or insulator leakage current monitoring function is characterized in that it includes: a current sensor 3 connected to the lightning arrester 1 or the insulator 2, the current sensor 3 is electrically connected to the signal processing circuit 5, the signal processing circuit 5 is electrically connected to the control module 7, the control module 7 is electrically connected to the telemetry module 4, the remote control module 6, the power module 8, the remote signal module 9, and the image sensor 10, the remote signal module 9 is electrically connected to the router 12, and the router 12 is electrically connected to the server 11 and the workstation 13.

[0023] The current sensor 3 adopts an open-close current transformer to monitor the leakage current of the lightning arrester or the insulator without disassembling the lightning arrester or the insulator.

[0024] Telemetry module 4 is an ATT7022B power acquisition chip. The chip has a measurement accuracy of 0.2s and 0.5s for active and reactive power respectively. The electrical parameters that can be measured include active, reactive, apparent power, bidirectional active and four-corner limited reactive energy; voltage and current effective value; phase, frequency, etc. ATT7022B has the advantages of complete measurement parameters and perfect calibration power.

[0025] The signal processing circuit 5 includes a resistor circuit, an RC filter circuit and an operational amplifier circuit connected in sequence. Figure 2 As shown, because the leakage current is relatively small, generally only a few hundred mA, the leakage current signal amplitude is adjusted to the acceptable range of the control module through the signal processing circuit 5. As shown in the figure, the leakage current generates a voltage drop on the resistor RQ, which is filtered by the RC filter circuit composed of resistors R6Q, R6BQ and capacitor C7Q, and then amplified by the amplifier circuit based on the operational amplifier chip U1 (MC33072), and finally the current signal input to the control module is obtained.

[0026] The remote control module 6 is a 433MHz wireless radio chip. The transmission distance of the 433MHz wireless module is affected by many factors, including environment, weather, interference, etc. Under ideal conditions, that is, in an open environment without much interference, the communication distance of the 433MHz wireless module can reach more than 1000 meters.

[0027] The control module 7 is a MSP430 series single-chip microcomputer. The features of the MSP430 single-chip microcomputer mainly include:

[0028] Ultra-low power consumption: The MSP430 microcontroller has excellent low power consumption performance and is suitable for battery-powered devices that run for a long time. Easy to operate: The MSP430 microcontroller provides a wealth of peripheral interfaces and debugging functions, which is convenient for users to develop and test. Powerful computing power: The MSP430 microcontroller uses a 16-bit central processor to achieve efficient data processing. Wide operating voltage range: The MSP430 microcontroller can operate in the range of 1.8V to 3.6V, meeting the needs of various application scenarios.

[0029] The power module 8 is a low-voltage DC regulated power supply, which is used to convert the DC voltage required by each module of the FTU, such as 5V, 3.3V.

[0030] The remote signal module 9 is a 4G / 5G module, a LORA module or a NB-IoT module, which realizes the communication between the FTU terminal and the remote server and workstation, wherein the workstation 13 is an industrial computer and the image sensor 10 is a camera with night vision function.

[0031] The working principle of the utility model is:

[0032] The current sensor 3 uses an open-close current transformer to monitor the leakage current of the arrester or insulator without removing the arrester or insulator. The monitored leakage current signal is adjusted to an acceptable range for the control module through the signal processing circuit 5. At the same time, the image sensor is a camera with night vision function, which is installed on the transmission line tower for remote visualization and acquisition of lightning arrester or insulator image information to facilitate defect confirmation and analysis. The remote control module, telemetry module, and remote signaling module realize the corresponding "three remote" functions. All monitoring and control information are sent to the router through the wireless network, and finally remote monitoring is realized through the server and workstation.

[0033] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An FTU with a lightning arrester or insulator leakage current monitoring function, characterized in that: include: A current sensor connected to a lightning arrester or an insulator, the current sensor is electrically connected to a signal processing circuit, the signal processing circuit is electrically connected to a control module, the control module is electrically connected to a telemetry module, a remote control module, a power module, a remote signaling module, and an image sensor, the remote signaling module is electrically connected to a router, and the router is electrically connected to a server and a workstation.

2. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The current sensor adopts a split current transformer.

3. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The telemetry module is an ATT7022B power collection chip.

4. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The signal processing circuit includes a resistor adopting circuit, an RC filtering circuit and an operational amplifier circuit which are connected in sequence.

5. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The remote control module is a 433M wireless radio frequency chip.

6. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The control module is a MSP430 series single chip microcomputer.

7. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The power supply module is a low-voltage DC regulated power supply.

8. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The remote signal module is a 4G / 5G module, a LORA module or a NB-IoT module.

9. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The workstation is an industrial computer.

10. The FTU with arrester or insulator leakage current monitoring function according to claim 1, characterized in that: The image sensor is a camera with a night vision function.

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