Device and method for measuring voltage of noncontact charge induced high-voltage transmission line

Abstract

The invention discloses a device and a method for measuring voltage of a noncontact charge induced high-voltage transmission line, and relates to an electronic sensor in the field of intelligent power grids. The device comprises a voltage testing sensor; the voltage testing sensor comprises an electric field sensor, a voltage correcting sensor, a data processing module and a signal output module, wherein the electric field sensor is used for acquiring electric field signals around the transmission line, the data processing module is used for receiving the electric field signals and converting the electric field signals into voltage signals, and the signal output module is used for receiving the voltage signals, processing the voltage signals and outputting the processed voltage signals to a display; and the electric field sensor comprises two hemispherical shell types electrodes and a measurement capacitor placed in a cavity formed by two hemispherical shells, and two polar plates of the measurement capacitor are connected with the hemispherical shell types electrodes respectively. Because the acquired signals are digitally transmitted, the precision is improved, the measuring range is wide, and saturation is not caused; and because the sensors are single-pole noncontact sensors, the installation is simple, the detachment is convenient, the volume is small, and great convenience is brought to construction and maintenance of the power grids.

Description

technical field [0001] The invention relates to electronic sensors in the field of smart grids, in particular to an active electronic unipolar voltage sensor and a voltage measurement method. Background technique [0002] The development of modern power system is characterized by large capacity, high voltage, miniaturization, digitization and automation of transmission and distribution systems. With the continuous increase of grid voltage, the volume of traditional transformers is getting larger and larger, the insulation structure is becoming more and more complex, and the difficulty of manufacturing is also increasing. At the same time, problems such as hysteresis, magnetic saturation, secondary non-open circuit, low linearity, and small static and dynamic accuracy ranges in traditional transformers have become increasingly prominent, which can no longer provide guarantee for the development of power systems. Since the output of the traditional transformer is an analog si...

AI Technical Summary

Problems solved by technology

With the continuous increase of grid voltage, the volume of traditional transformers is getting larger and larger, the insulation structure is becoming more and more complex, and the difficulty of manufacturing is also increasing.

At the same time, problems such as hysteresis, magnetic saturation, secondary non-open circuit, low linearity, and small static and dynamic accuracy ranges in traditional transformers have become increasingly prominent, which can no longer provide guarantee for the development of power systems.

Since the output of the traditional transformer is an analog signal, it cannot provide the required digital signal for the automation of the power transmission and distribution system, so it has become a problem that must be solved in the digital substation.

In addition, traditional electromagnetic current and voltage transformers are large in size, complex in structure, easy to saturate the iron core, poor in reliability, low in integration and digitization, and require high insulation performance

A lot of inconvenience, it is difficult to meet the current requirements of smart grid construction based on the Internet of Things

Images