Wireless high-precision synchronization on-site capacitive equipment online monitoring checking system and method

Abstract

The invention relates to a wireless high-precision synchronization on-site capacitive equipment online monitoring checking system and method. The checking system includes a voltage sampling device, achecking device, a signal coordinator, a current sampling sensor and two signal slave machines. The checking method includes the following steps: the voltage sampling device and the checking device are powered on to wirelessly and synchronously sample the phase difference (xi) between a voltage signal and a current signal; the checking device conditions the sampled current signal and inputs the current signal to a phase locked loop to trigger DA to output a datum signal; the phase difference (xi) is corrected to the initial phase of the signal output by DA, so as to get a datum voltage signalwhich is the same with a reference voltage signal in frequency and phase; DA adjusts the datum voltage signal according to the current amplitude and phase angle set by a human-computer interaction device, and outputs the datum voltage signal through a power amplifier; and finally, the datum voltage signal is injected into an online monitoring device sensor to verify whether an online monitoring device is qualified. The system and the method of the invention have the advantages of high signal synchronization accuracy, small error, convenience of check, and the like.

Description

technical field [0001] The invention relates to the field of on-line monitoring of electric power equipment, in particular to a wireless high-precision and synchronous on-site capacitive equipment on-line monitoring and verification system and method. Background technique [0002] When the high-voltage electrical equipment operating in the power grid has insulation defects caused by factors such as poor manufacturing, aging, and external damage, it will cause equipment failure or insulation accidents, which will seriously affect the normal operation of the power grid. In order to prevent such major safety accidents, the current traditional method is to regularly cut off the power for preventive tests and maintenance after the equipment is put into operation, so as to detect the insulation defects inside the equipment in time. However, the test conditions of the power failure preventive test are quite different from the operating state. The dielectric loss test is usually tes...

AI Technical Summary

Problems solved by technology

[0004] The existing wired way to take the PT voltage reference has the following problems: When the PT voltage device is far away from the capacitive equipment at the calibration point, a long signal line needs to be pulled, and the signal will be distorted and attenuated; when the calibration device is moved at different calibration points , it is necessary to manually receive and release the signal line, which wastes manpower and time, and the calibration efficiency is low

[0005] In addition, the existing wireless high-precision synchronization is mostly GPS plus radio frequency data transmission. The GPS antenna needs to be placed on the site, and it takes a certain period of time to perform synchronization after the positioning is successful, otherwise the error will be large

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