Method and a data processing system for the determination of the excitation conditions, that a remote reserve protection system for means - and high-voltage lines

摘要

A process for the determination of the excitation condition, that a remote reserve protection system for means - and high-voltage lines with the following steps:– Measurement of the conductor currents i_R, i_S and i_T,– Calculation of the fundamental component the conductor current i_R(t), i_S(t) and i_T(t) at the point in time t,– Calculation of the symmetrical components of the co-rotating system current i₁(t) and against the system current i₂(t),– Formation of the protection criteriaa) difference value, with t₀ + Δt as a change in δi₁ in the co-rotating system,b) difference value, with t₀ + Δt as a change in δi₂ in the negative phase-sequence andc) ratio δk_|21| = Δi₂/Δi₁,in the case ofΔi₁ ≥ Δi₁, Δi₂ ≥ Δi₂ and δk_|21| ≥ Δk_|21|, wherein δl₁, Δi₂ and δk_|21| Adjustment values are, and to avoid erroneous excitation by overcoupling of voltage asymmetry in the starting value δi₂ larger than the maximum value of the current i against system_{2 - Nb} in normal operation must be,the excitation condition, that for the reserve protection system (4) is satisfied, the reserve protection system (4) of a delayed trigger signal to the outputs associated power switches..