Phase relevant current differential protection method
A current differential and phase-related technology, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc. Problems such as current transformer malfunction, to achieve the effect of good reliability, strong resistance to transition resistance, and high safety
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[0035] Based on the new method of phase-related current differential protection proposed in the present invention, four implementation criteria and calculation methods are proposed: phase-related current differential protection criteria for full current, phase-related current differential protection criteria based on fault components, The phase-dependent current differential protection criterion based on the sequence component and the phase-dependent current differential protection criterion with variable slope.
[0036] 1. Criterion for full current phase-dependent current differential protection
[0037] The full current phase-dependent current differential protection criterion proposed by the present invention is as follows:
[0038]
[0039] where I m , I n respectively represent the current phasors collected and calculated on both sides of the current differential protection, for and the angle between, when angle ahead of is positive when the angle is . B...
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