Patent · US Expired

Method of monitoring a tap selector

US6124726A · kind A · utility

21Cited by

3References

10Claims

0Family size

Assignee

MASCHINENFABRIK REINHAUSEN GMBH · DE

Inventors

Dieter Dohnal · Lappersdorf, DE
Manfred Stadelmayer · Wenzenbach, DE
Karsten Viereck · Teisendorf, DE

Key dates

Filing date	Oct 7, 1998
Grant date	Sep 26, 2000
Priority date	—
Expiry date	Oct 7, 2018

Classification

Technology area (CPC H)Electricity
CPC primaryH01H2009/0061
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A tap selector for a power transformer switchable under load is monitored by detecting the effective values of current and voltage of the drive motor of the tap changer. The power is calculated and from that the instantaneous torque and the latter is compared with setpoint values either of the torque and position of the tap selector or in terms of characteristic segments of the torque versus time graph with normalized segments of a setpoint graph so that, with serious deviation an immediate shutdown of tap selector operations is ensured or information can be generated as to trends or the need for maintenance.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.