Distribution line breakage monitoring method and device based on voltage and current vectors
A technology of power distribution lines, voltage and current, applied in measuring devices, measuring electrical variables, measuring electricity and other directions, it can solve the problems of the current method that the signal is not necessarily obvious, easy to miss and misjudgment, and the influence of judgment accuracy.
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[0057] Principles of circuit analysis and disconnection judgment:
[0058] 1. Circuit analysis
[0059] Case 1: Three-phase three-wire Y-Y symmetrical circuit
[0060] Let the effective value of AB phase line voltage be U L , the phase angle is 0 degrees, and the impedance of each phase is Z a = Z b = Z c = Z, each phase-to-line voltage vector can be expressed as follows:
[0061]
[0062] The corresponding relationship between the phase-to-line voltage and the phase voltage is
[0063]
[0064] Then the A-phase line current is
[0065]
[0066] The B-phase line current is
[0067]
[0068] The B-phase line current is
[0069]
[0070] In this case, the phase difference of the voltage and current of the three-phase lines in all parts of the power grid is 120°. The circuit diagram and its voltage and current vectors such as figure 1 , figure 2 .
[0071] Case 2: Three-phase three-wire system Y-Y symmetrical circuit, B-phase load disconnection
[007...
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