Grounding device shunt vector test method and device based on GPS second pulse

Abstract

The invention discloses a grounding device shunting vector testing method based on GPS pulse per second(PPS). The grounding device shunting vector testing method is characterized in that a PPS signal provided by a GPS artificial earth satellite is used to provide the same time marks for shunting vector measurement and signal output, and thereafter the phase difference between the measured shunting vector value and the signal output reference voltage value can be calculated synchronously, and therefore the shunting vector value can be calculated. The invention also discloses a grounding device shunting vector testing device. The extra reference voltage lead is not required, and the limitation and the obstruction of the on-site testing environment conditions such as the area of the to-be-tested grounding device and the existence of the barriers can be prevented, and in addition, the on-site electromagnetic interference capability is strong, and the shunting vector values of the inlet wires and the outlet wires can be accurately measured without dismounting various inlet wires and various outlet wires, and therefore the grounding impedance value of the grounding device can be acquired accurately, the transmission distance is long, the signal delay can be prevented, and the workload is small, and in addition, the on-site test and use can be simpler and more convenient.

Description

technical field [0001] The invention belongs to the field of grounding device state detection and evaluation, and relates to a grounding device shunt vector test method and its device, more specifically, a grounding device shunt vector test method and device based on GPS second pulse. Background technique [0002] Grounding impedance is an important index to evaluate the operation status of the grounding device, and it is of great significance for its accurate evaluation. However, since there are various incoming and outgoing lines in power plants and substations, the shunting effect of these incoming and outgoing lines will have a great impact on the grounding impedance test of the grounding device, resulting in the inability to accurately obtain the grounding impedance value of the grounding device during field testing, so it is very useful. It is necessary to accurately measure the shunt status of various incoming and outgoing lines on site in order to correct the groundi...

AI Technical Summary

Problems solved by technology

Although this method can measure the shunt phase shift to a certain extent, because the wireless frequency selection communication technology and its equipment are easily affected by the field test environment, it will not only affect the transmission quality of the wireless signal in the strong electric field interference environment on site, Moreover, in the case of encountering on-site obstacles, the effective distance of its transmission is limited.

For example, for some very large substations or converter stations, there may be areas that cannot be covered by wireless signals

At the same time, this method requires a series of delays from wireless signal transmission to signal reception. Simple software algorithm correction will also introduce certain errors, which will affect the test results.

In addition, this method generally requires additional corresponding wireless transmission units and special frequency-selective communication equipment, which will also affect the workload of on-site testers to a certain extent.

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