High-voltage capacitance bridge automatic frequency locking device

Abstract

The invention relates to the technical field of electric power test equipment metering, and discloses a high-voltage capacitance bridge automatic frequency locking device which comprises a test power supply, the output end of the test power supply is electrically connected with a tested device and a standard capacitor, and the output end of the tested device is electrically connected with a current comparator. According to the invention, when a signal transmitted from a tested device is transmitted to a frequency detector through a current comparator, the frequency detector detects the transmitted frequency, then adjusts the unbalanced frequency through an unbalanced current regulator, and transmits the frequency adjusted by the unbalanced current regulator to a frequency selector. The frequency selector amplifies the frequency through the frequency amplifier and then transmits the amplified frequency to the balance current display device for display, and through the application of the automatic frequency locking amplification device, the situation that the safety of a whole power grid is affected due to the fact that some specific harmonic waves are damaged is avoided.

Description

technical field [0001] The invention relates to the technical field of electric power test equipment measurement, in particular to an automatic frequency locking device for a high-voltage capacitor bridge. Background technique [0002] The high-voltage capacitor bridge is a special AC bridge for measuring the dielectric loss tg value. When measuring, the entire line is formed into a bridge-shaped line, and a comparative measurement method is adopted, that is, an instrument that compares the measured value with a known quantity to determine the size of the measured value. The reason why the high-voltage bridge is called a special AC bridge is that in addition to the difference in structure and measurement requirements, the requirements for the test voltage and frequency are also different during measurement, so in general, the high-voltage bridge It is a special AC bridge. [0003] The high-voltage capacitor bridge is mainly used to measure the capacitance and dielectric lo...

AI Technical Summary

Problems solved by technology

[0003] The high-voltage capacitor bridge is mainly used to measure the capacitance and dielectric loss of various insulating materials (such as various insulating oils and insulating materials) and power capacitive equipment (such as transformers, transformers, capacitors, power cables, etc.) under power frequency and high voltage. factor, and judge the insulation level of insulating equipment through the dielectric loss factor, most of the power equipment will encounter many harmonic components in the actual operation process, and some specific harmonics will damage it, thus affecting the entire The safety of the grid For this reason, we propose an automatic frequency-locking device for high-voltage capacitor bridges

Images