Non-contacting-type power frequency voltage measuring device

Abstract

The invention discloses a non-contacting-type power frequency voltage measuring device. The problems that an existing measuring device is in electric contact with a tested electric cable, so that operation is not convenient, and potential safety hazards exist are mainly solved. The non-contacting-type power frequency voltage measuring device comprises a non-contacting-type measuring clamp (1), a difference charge amplifier (2), a rectifier filter (3), a gain regulator (4) and a meter head (5). The non-contacting-type measuring clamp (1) is based on the near field radiation principle, a near field radiation signal of the tested electric cable is formed by coupling in an electromagnetic coupling mode, the power frequency voltage effective value of the tested electric cable is measured through a circuit, and a non-contacting-type measuring process is completed. The device is not in electric contact with the tested electric cable and has the advantages of being simple in operation and complete, halting is of no need, the device can be used for system testing, debugging and fault diagnosis in the field of a distributed measuring and controlling system and an electric electronic system.

Description

technical field [0001] The invention belongs to the technical field of electromechanical devices, and relates to a test / non-contact voltage measuring device, which can be used for non-contact measurement of power frequency voltage. Background technique [0002] Power frequency voltage refers to the uniform standard voltage of the power industry and electrical equipment stipulated by the state. Power frequency voltage is one of the important contents of power frequency parameters of transmission lines, and its measurement is of great significance to the collection of power system parameters. Power frequency voltage measurement mainly uses electric pen and voltmeter. The electric pen has the advantages of simple circuit and low cost, but the measurement accuracy is low. The voltmeter has high measurement accuracy and has a user-friendly interface. Although electric pencils and voltmeters have many advantages, in some industrial applications, electric pencils and voltmeters ...

AI Technical Summary

Problems solved by technology

Although electric pencils and voltmeters have many advantages, in some industrial applications, electric pencils and voltmeters still cannot get rid of the limitations of their use, that is, there is an electrical connection between the power supply under test and the test device, so there are the following disadvantages:

[0003] First of all, there is electrical contact between the power supply under test and the test device. In some high-voltage situations, if the operation is wrong, it will cause damage to the equipment on the circuit under test and the tester;

[0004] Secondly, in some industrial occasions, since there is no exposure of the test point, the equipment needs to be powered off during the measurement, which will cause the system to temporarily stop working, which is not allowed in many industrial sites;

[0005] Finally, since the electric pen and voltmeter need to be in electrical contact with the conductor under test, the cable insulation layer needs to be destroyed for some measurements, which is not only inconvenient in operation, but also has potential safety hazards

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