Line parameter double-end testing system and method based on GPS synchronization

Abstract

The invention provides a line parameter double-end testing system and method based on GPS synchronization, and the system and method can effectively achieve the synchronous measurement of data parameters of head and tail ends of a power transmission line. The structure of the system comprises a head end machine and a tail end machine. The head end machine comprises a first CPU, a first GPS module, a testing power module, a first wiring conversion module, a first A / D conversion module, a first signal conditioning module, and a first voltage and current sensor. The tail end machine comprises a second CPU, a second GPS module, a second wiring conversion module, a second A / D conversion module, a second signal conditioning module, and a second voltage and current sensor. The method comprises the steps: testing power outputting, wiring reverse rotating operation, the transmission of time data and pulse per second through the GPS modules, data collection, data storage, and data calculation.

Description

technical field [0001] The invention relates to the technical field of transmission line parameter testing, in particular to a system and method for dual-terminal testing of line parameters based on GPS synchronization. Background technique [0002] Positive-sequence parameters and zero-sequence parameters of high-voltage transmission lines, as well as mutual impedance and coupling capacitance between lines are important system parameters of the power grid. Power system overvoltage calculation, latent supply current calculation, power flow and stability calculation, short-circuit current calculation and relay protection The basic parameters such as setting calculation are the basis for primary equipment check of UHV transmission system, dynamic simulation of relay protection and development of new principle relay protection, formulation of control measures for safe and stable operation, analysis and selection of operation mode, etc. The geographical environment along the UHV...

AI Technical Summary

Problems solved by technology

[0003] The density of the power grid is getting higher and higher, double-circuit or multi-circuit lines on the same tower have become the norm, the coupling between lines has reached an unprecedented level, and the power frequency interference current induced by electromagnetic coupling can reach 100A. The demand for high-reliability power supply makes It is becoming more and more difficult to reduce the interference level through power outages. In the traditional test method, the method of using power frequency power supply for testing can not eliminate the influence of interference on the test results. Using different frequency signals that deviate from power frequency interference (50Hz) to measure the line parameters, the method of separating useful inter-frequency test signals and interference signals in the frequency domain came into being

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