Verfahren, Vorrichtung und System zur Erkennung von Endstrom in einem Stromwandler

Details

Veröffentlichungs-Nr.

EP4790431

Anmeldetag

3. Februar 2026

Veröffentlichung

12. August 2026

Rechtsraum

EP

IPC

G01R19/165

Abstract

The present disclosure relates to field of electrical engineering that discloses method, tail current detection unit and an Intelligent Electronic Device (IED) comprising the tail current detection unit for detecting tail current in CT. The tail current detection device obtains real-time current values of current flowing. Further, tail current detection unit determines instant time constant (K<t>). Thereafter, tail current detection unit determines deviation value (ΔK<t>) by using pair of consecutive time constants. Furthermore, tail current detection unit compares deviation value (ΔK<t>) with predefined deviation threshold. Thereafter, based on comparison, tail current detection unit performs one of, incrementing counter each time when deviation value (ΔK<t>) is less than predefined deviation threshold in consecutive time instances and resetting counter to zero when deviation value (ΔK<t>) is greater than predefined deviation threshold. Finally, tail current detection unit detects presence of tail current in CT when counter exceeds predefined count threshold. Present disclosure provides advantage of avoiding false alarms due to tail current.

Anmelder

Firma

ABB Schweiz AG

Land

🇨🇭 Schweiz

Fachgebiete