Anti-jamming measuring method for power transmission line zero-sequence capacitance based on harmonic component
A technology for transmission lines and zero-sequence capacitance, which is applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., and can solve the problems that the accuracy of zero-sequence capacitance theoretically calculated values cannot meet engineering requirements, etc.
Inactive Publication Date: 2012-01-18
WUHAN UNIV
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Problems solved by technology
Since the zero-sequence capacitance parameters of the transmission line are affected by many factors, the accuracy of the zero-sequence capacitance theoretical calculation value obtained by the formula calculation method cannot meet the engineering requirements
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[0053] The zero-sequence capacitance anti-interference measurement method of transmission line based on harmonic components of the present invention comprises the following steps:
[0054] (1) Obtain the current data and voltage data on the transmission line to be tested by the following methods:
[0055] Cut off the power of the transmission line to be tested, open the three phases at the end and short the three phases at the first end, and apply the single-phase AC voltage of the substation where the pressurization point of the transmission line is located at the first end of the transmission line to be tested, and the frequency of the pressurization source is industrial frequency Instead of different frequencies, the measurement wiring diagram is attached figure 1 shown. Using GPS time synchronization technology, the measurement system synchronously collects the zero-sequence voltage, zero-sequence current and zero-sequence voltage at the end of the transmission line to be...
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The invention discloses an anti-jamming measuring method for power transmission line zero-sequence capacitance based on harmonic component, which comprises the following specific steps of: shutting off a power transmission line to be measured, enabling the tail end of the line to be in open circuit and the head end of the line to be in three-phase short connection; boosting the power transmissionline to be measured by directly using a single-phase power frequency power supply of a transformer substation where a boosting point at the head end of the power transmission line to be measured is arranged; synchronously acquiring zero-sequence voltage and zero-sequence current at the head end of the power transmission line to be measured and zero-phase current at the tail end of the power transmission line to be measured; calculating the zero-sequence capacitance of the power transmission line to be measured by using the harmonic component according to the measured voltage data and current data; and converting the zero-sequence capacitance into zero-sequence capacitance of the power transmission line at power frequency. According to the method disclosed by the invention, the influence from the power frequency jamming is eliminated and the precision of the measuring result for the zero-sequence capacitance of the power transmission line is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of power system transmission line parameter measurement, and in particular relates to a transmission line zero-sequence capacitance anti-interference measurement method. Background technique [0002] With the development of the scale of the power system, there are more outgoing lines in power plants and substations, and more and more mutual inductance lines. [0003] The methods to determine the zero-sequence capacitance parameters of transmission lines include formula calculation method and power failure measurement method. Since the zero-sequence capacitance parameters of the transmission line are affected by many factors, the accuracy of the zero-sequence capacitance theoretical calculation value obtained by the formula calculation method cannot meet the engineering requirements. [0004] Before a new transmission line is put into operation, it is necessary to measure parameters such as the zero-sequence...
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IPC IPC(8): G01R27/26
Inventor 胡志坚
Owner WUHAN UNIV