Power frequency electric field intensity measurement system under power transmission line

Abstract

The invention discloses a power frequency electric field intensity measurement system under a power transmission line. The power frequency electric field intensity measurement system comprises a spherical capacitive sensor, wherein two poles of the spherical capacitive sensor are respectively and correspondingly connected with two input ends of a pre-posing differential amplification circuit, andan output end of the pre-posing differential amplification circuit is connected with an input end of a controllable gain amplification circuit; and an output end of the controllable gain amplificationcircuit is connected with a single-chip microcomputer, and the single-chip microcomputer is connected with the display unit. The power frequency electric field intensity measurement system is simplein structure and low in cost, can effectively measure the power frequency electric field, gives visual numerical value display, timely reflects the current electric field intensity, reminds an operator to timely evacuate from areas such as areas where the electric field intensity exceeds the standard and the like are not suitable for long-time operation, enables the operator to take preventive measures, and guarantees the personal safety and normal operation of a power system.

Description

technical field [0001] The invention belongs to the technical field of power frequency electric field strength measurement for power transmission and transformation projects, and in particular relates to a power frequency electric field strength measurement system under power transmission lines. Background technique [0002] Because there is a power frequency electric field near the high-voltage transmission line, the power frequency electric field will induce dangerous voltage on the conductors. When people touch these conductors, an instantaneous surge current will be formed and flow through a certain part of the human body to cause an electric shock. Because the wire covers a wide area, has a large ground capacitance, and can gather enough energy to cause fatal damage to the human body. In recent years, with the continuous increase of the voltage level, the phenomenon of electrostatic induction has become more and more prominent. [0003] With the development of computer ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the existing problems of complex power frequency electric field measurement equipment and low measurement accuracy, the present invention proposes a power frequency electric field intensity measurement system under the transmission line, using a spherical capacitive sensor under the action of an alternating electric field, the metal electrode surface will be Induce the induced charge that changes at the same frequency as the electric field to be measured, and process the induced charge accordingly to obtain an electric field measurement signal that is proportional to the electric field to be measured, and calculate the electric field at the point to be measured according to the corresponding mathematical relationship Intensity, which enables the measurement of electric field strength around transmission lines

Images