Pulse current sensor and surge wave recording lightning protection box manufactured by adopting same

Abstract

The invention provides a pulse current sensor and a surge wave recording lightning protection box manufactured by adopting the same. The pulse current sensor comprises a pair of oppositely arranged semi-arc magnetic cores, wherein an air gap is reserved between the two semi-arc magnetic cores; a nonmagnetic metallic conducting ring is sleeved outside the air gap, and an inner bore axial line of the nonmagnetic metallic conducting ring is in accordance with the magnetic lines of the semi-arc magnetic cores; coils are wound on the semi-arc magnetic cores, and output terminals are led from the coils. In the pulse current sensor, two nonmagnetic metallic conducting rings are arranged in two symmetric gaps of the two semi-arc magnetic cores; therefore, under the action of the two semi-arc magnetic cores, the pulse current sensor is free of magnetic circuit saturation, and the output accuracy and output range of the pulse current sensor are improved, which establishes a foundation for displaying a whole voltage oscillogram. By the adoption of the pulse current sensor, the test sensitivity is improved, and the measurement error is reduced.

Description

technical field [0001] The invention relates to a lightning protection box for recording surge waves, in particular to a lightning protection box capable of recording and querying the waveforms of lightning strike current and surge current. Background technique [0002] At present, the known lightning protection box is composed of a casing, terminal blocks, conductive connecting wires, electrodes, semiconductor chips, mechanical thermal tripping devices, indicating devices, counter devices, current peak display and installation fixtures. Its working principle is to be installed between the phase wire and the ground wire, the neutral wire and the ground wire of the power distribution system respectively. When a high-voltage surge wave or lightning wave occurs in the power distribution system and reaches the excitation of the semiconductor chip to conduct, the chip's own high resistance drops sharply to become a low-resistance conductor and discharges to the ground. At this ti...

AI Technical Summary

Problems solved by technology

However, with the improvement of power quality requirements for electrical equipment and electronic equipment, people must understand the surge clutter that appears on the power supply and signal lines, especially the width, shape, size, energy and time of occurrence of the waveform. In the process of lightning protection work, only the current peak value, time and times are displayed, and it is impossible to identify and distinguish what kind of surge wave or lightning wave the overvoltage is, which makes it impossible to correct the accident caused by the surge wave or lightning wave. analysis, it is impossible to show the magnitude of the energy of this process, and it is impossible to make a comprehensive assessment of the accident

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