FIELD: equipment of electrified railway roads.
SUBSTANCE: apparatus includes pickup of harmonic components of thrust electric current arranged in influencing contact circuit. Unit for processing signal includes n-link thrust electric current selector; first n-link unit of phase shifting members; first n-link unit of phase shift regulators; first n-link unit of scale amplifiers with scaling factors Ksc(comp) and mixing unit. Feedback circuit includes pickup for measuring harmonic components of compensating electric current of screening wire; n-link selector of compensating electric current; second unit of phase shifting members; second n-link unit of phase shift regulators; second n-link unit of scale amplifiers with scaling factors Ksc(m)selected according to relation Ksc(comp) - Ksc(m) = 1. Control inlet of controlled electric current source is connected with outlet of mixing unit. Said source is connected in series with grounded-end screening wire placed between contact circuit and line subjected to influence. Novelty is second feedback circuit including pickup for measuring harmonic components of induced noise; n-link noise selector and n-link unit for measuring amplitudes of harmonic components of noise for detecting their fluctuation in comparison with preset values.
EFFECT: improved protection of communication lines adjacent to thrust circuit due to correction of control algorithm according to real value of noise in adjacent communication line.
1 dwg, 1 ap
