A grounding device GPS shunt phase shift testing method and system

Abstract

The invention discloses a GPS shunting phase-shifting test method for a grounding device. PPS second pulse synchronization signals are provided through a GPS artificial earth satellite. The method includes calculating the phase difference between injecting different frequency current signals, generating different frequency voltage drop and incoming and outgoing line configuration shunting and GPS second pulse signal rising edges, taking the different frequency voltage drop as reference, and realizing accurate measurement of shunting phase-shift of the grounding device. The invention discloses a GPS shunting phase-shifting test system for a grounding device. No extra referential voltage lead is needed, and the method and system are not limited and isolated by on-site test environmental conditions. The method and system have the advantages of strong anti-electromagnetic interference capability, long transmission distance, no signal delay and low workload, and are convenient to use in on-site tests.

Description

Technical field [0001] The invention belongs to the field of grounding device state detection and evaluation, and specifically relates to a GPS shunt phase shift test method for grounding devices. Background technique [0002] There are various incoming and outgoing wire structures in power plants and substations. The shunting effect of these incoming and outgoing wire structures makes it impossible to accurately obtain the ground impedance value of the grounding device during field testing. The traditional domestic and foreign measurement methods for the shunt of grounding devices are mainly to determine the shunt coefficient by measuring the shunt size on site, that is, to measure the shunt modulus of various outgoing wires such as overhead ground wires and cable outer sheaths through a clamp ammeter. Simple algebraic addition and subtraction, and then compared with the test injection current modulus to determine the size of the shunt coefficient. This method ignores the effec...

AI Technical Summary

Problems solved by technology

Although this method can measure the shunt phase shift, the effective distance of its transmission is limited because the wireless communication technology is easily affected by the field test environment, especially in the case of field obstacles.

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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