methods for reduction of effects in a mehrphasigen network with the operation of a single cycle, a wechselstromsteller with a steuerwinkel asked rl load

摘要

A resistive and inductive load (1) is supplied from two lines (L2,L3) of a three-phase network (N) via an AC limiter (T). The load current (iL) and voltage (u) are measured (4) and their peak values used to obtain (5) the load phase angle (phi L) and reference power (SBEZ). Active power (P) and fundamental frequency reactive power (Q50) are found by table lookup (7,6) and applied to control (8-10) the in-phase compensating capacitor (KC) and out-of-phase symmetrising capacitor (SC) and inductor (SL). USE/ADVANTAGE - Esp. against imu impulsive loading by single-phase resistance welders. Inductive and capacitive corrections are performed with practically no delay.