Lightning arrester type insulation monitoring device

Abstract

The invention provides a lightning arrester type insulation monitoring device, which relates to the technical field of power grid insulation monitoring and comprises a signal acquisition module, a microprocessor board and a power supply for supplying power. The signal acquisition module is used for acquiring leakage current of the lightning arrester and transmitting the leakage current to the microprocessor board; the microprocessor board is used for processing leakage current data, finding out a fundamental wave part of resistive current from collected lightning arrester dew current, calculating a fundamental wave resistive current peak value and a capacitive current peak value through a fundamental wave method, inputting current and voltage, and extracting fundamental wave and resistive current fundamental wave peak values after digital filtering. According to the invention, the working condition of the lightning arrester is dynamically monitored mainly by measuring the leakage current and resistive current of the zinc oxide lightning arrester by using a fundamental wave method, so that pre-diagnosis and alarm can be effectively realized, fault disasters can be prevented, the loss can be reduced, the maintenance cost can be reduced, the fault rate can be reduced, and the equipment outage time can be shortened.

Description

Technical Field

[0001] The invention relates to the technical field of power grid insulation monitoring, in particular to a lightning arrester type insulation monitoring device. Background Art

[0002] In the power grid, high-voltage electrical equipment plays an irreplaceable role. If its insulation is degraded or defective, it may affect the normal operation of the power grid equipment and cause safety accidents. In the past, equipment maintenance and testing work was done during the operation of the power grid equipment, mostly through regular power outages, which easily affected the factory's power environment.

[0003] In order to solve the above problems, we propose a lightning arrester type insulation monitoring device to solve the above problems. Summary of the invention

[0004] In order to solve the problems in the background technology, the present invention provides a lightning arrester type insulation monitoring device.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A lightning arrester type insulation monitoring device includes a signal acquisition module, a microprocessor board and a power supply for power supply; The signal acquisition module is used to collect the leakage current of the lightning arrester and transmit it to the microprocessor board; The microprocessor board is used to process the leakage current data, find the fundamental wave part of the resistive current from the collected arrester leakage current, and calculate the fundamental wave resistive current peak value and capacitive current peak value by the fundamental wave method. The calculation formula is: ; Then, the input current and voltage are digitally filtered to extract the fundamental wave and the peak value of the fundamental wave of the resistor current; Then calculate the performance of the arrester by the projection method; The calculation formula is: ; Among them, in the direction of the voltage fundamental wave U1, the total current fundamental peak value Ix1p is expected to be Ir1p, and in the vertical direction it is expected to be Ic1p, and φ is the basic phase angle of current and voltage, including the selected compensation angle.

[0006] Preferably, the signal acquisition module includes a micro-current sensor, and the micro-current sensor is used to monitor and collect the leakage current of the lightning arrester grounding wire in real time.

[0007] Preferably, the microprocessor board is connected to an alarm module, and the alarm module is used for warning reminders.

[0008] Preferably, the microprocessor board is connected to a host computer communication, and the host computer communication is used to transmit information processed by the microprocessor board.

[0009] Preferably, the microprocessor board is connected to an operation panel and a display, the operation panel is used to manipulate data of the microprocessor board, and the display is used to display the data.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The monitoring device provided by the present invention mainly utilizes the fundamental wave method to measure the leakage current and resistive current of the zinc oxide lightning arrester to realize dynamic monitoring of the working condition of the lightning arrester, which can effectively pre-diagnose and alarm, prevent the occurrence of fault disasters, reduce losses, and at the same time reduce maintenance costs, reduce failure rates, and reduce equipment downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A flow chart of the system monitored by the present invention; Figure 2 It is a schematic diagram of the signal acquisition leakage current in the present invention. DETAILED DESCRIPTION

[0012] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows: Example: Refer to Figure 1-Figure 2 As shown, a lightning arrester type insulation monitoring device of this embodiment includes a signal acquisition module, a microprocessor board and a power supply for power supply; The signal acquisition module is used to collect the leakage current of the lightning arrester and transmit it to the microprocessor board; The microprocessor board is used to process the leakage current data, find the fundamental wave part of the resistive current from the collected arrester leakage current, and calculate the fundamental wave resistive current peak value and capacitive current peak value by the fundamental wave method. The calculation formula is: ; Then, the input current and voltage are digitally filtered to extract the fundamental wave and the peak value of the fundamental wave of the resistor current; Then calculate the performance of the arrester by the projection method; The calculation formula is: ; Among them, in the direction of the voltage fundamental wave U1, the total current fundamental peak value Ix1p is expected to be Ir1p, and in the vertical direction it is expected to be Ic1p, and φ is the basic phase angle of current and voltage, including the selected compensation angle.

[0013] In some examples, the signal acquisition module includes a micro-current sensor, which is used to monitor and collect leakage current of the lightning arrester grounding wire in real time.

[0014] In some examples, the microprocessor board is connected to an alarm module, and when the monitored value reaches a preset safety value, the alarm module is activated to issue a warning reminder.

[0015] In some examples, the microprocessor board is connected to a host computer communication, and the host computer communication is used to transmit information processed by the microprocessor board.

[0016] In some examples, the microprocessor board is connected to an operation panel and a display, the operation panel is used to manipulate data of the microprocessor board, and the display is used to display the data.

[0017] The working principle of the present invention is: The high-voltage zinc oxide arrester insulation online monitoring provided by the present invention mainly utilizes the fundamental wave method to measure the leakage current and resistive current of the zinc oxide arrester to realize dynamic monitoring of the working condition of the arrester.

[0018] The fundamental wave method uses digital filtering technology and analog filtering technology to find the fundamental wave part of the resistive current from the collected arrester leakage current, and judge the insulation condition of the arrester based on the resistive current. The main principle of the fundamental wave method analysis is: under the action of the sinusoidal voltage, only the fundamental wave current in the resistance current of the zinc oxide arrester does work and generates power consumption. In addition, regardless of the harmonic voltage, the resistive fundamental wave current is a constant value. Therefore, the full current is analyzed by digital harmonics, and the resistive current is decomposed in advance by the fundamental wave to obtain the fundamental wave of the resistive current. The working condition of the zinc oxide arrester is judged according to the change in the proportion of the fundamental wave of the resistive current, which plays a role in real-time monitoring.

[0019] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A lightning arrester type insulation monitoring device, characterized in that: It includes a signal acquisition module, a microprocessor board and a power supply for power supply; The signal acquisition module is used to collect the leakage current of the lightning arrester and transmit it to the microprocessor board; The microprocessor board is used to process the leakage current data, find the fundamental wave part of the resistive current from the collected arrester leakage current, and calculate the fundamental wave resistive current peak value and capacitive current peak value by the fundamental wave method. The calculation formula is: ; Then, the input current and voltage are digitally filtered to extract the fundamental wave and the peak value of the fundamental wave of the resistor current; Then calculate the performance of the arrester by the projection method; The calculation formula is: ; Among them, in the direction of the voltage fundamental wave U1, the total current fundamental peak value Ix1p is expected to be Ir1p, and in the vertical direction it is expected to be Ic1p, and φ is the basic phase angle of current and voltage, including the selected compensation angle.

2. A lightning arrester type insulation monitoring device according to claim 1, characterized in that: The signal acquisition module includes a micro-current sensor, which is used to monitor and collect the leakage current of the lightning arrester grounding wire in real time.

3. A lightning arrester type insulation monitoring device according to claim 2, characterized in that: The microprocessor board is connected to an alarm module, and the alarm module is used for warning and reminding.

4. A cable type insulation monitoring device according to claim 3, characterized in that: The microprocessor board is connected to a host computer communication, and the host computer communication is used to transmit information processed by the microprocessor board.

5. A cable type insulation monitoring device according to claim 4, characterized in that: The microprocessor board is connected to an operation panel and a display, wherein the operation panel is used to manipulate data on the microprocessor board, and the display is used to display the data.

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