公开(公告)号：DE19645002A1

公开(公告)日：1998-05-07

申请号：DE19645002

申请日：1996-10-30

Applicant: ABB RESEARCH LTD

Inventor： PASCHEN ROLF PROF DR ING ,  FITTERER GERD DIPL ING ,  BOEHME HELMUT PROF DR ING ,  GRAEBER NORBERT DIPL ING

IPC: H02G7/20 ,  H02J3/00 ,  H02G7/00 ,  G05F7/00 ,  H01B11/06

Abstract: An overhead power line has at least one additional compensation loop. At least one conductor (7) of this/these loop(s) is parallel to, and near, the phase conductor nearest the ground and into this/these loop(s) is fed a compensation current whose phase and amplitude are adjusted relative to the phase angles and amplitudes in the three phase conductors so that its magnetic field works against that of the phase conductors. The compensation current is generated from a power supply (3) with a controller (5) connected with a magnetic field sensor (6). The compensation loop(s) has/have a series condenser(4). For a three phase system stacked one conductor above another, one conductor of the compensation loop(s) is above the uppermost phase conductor and the other is below the lowest phase conductor.

公开(公告)号：DE19634366A1

公开(公告)日：1998-03-05

申请号：DE19634366

申请日：1996-08-26

Applicant: ABB RESEARCH LTD

Inventor： BOEHME HELMUT PROF DR ING ,  BOERNER GUENTER DR ING ,  FANTANA NICOLAIE LAURENTIU DR ,  FLOCKERMANN DIRK DIPL ING ,  VOIGT BURKHARD

IPC: G01R31/34 ,  G01R19/00

Abstract: The method provides determination of characteristic electric and mechanical parameters of a three-phase current asynchronous motor using a run out search without using measurement means for rotation rate detection. At least the parameters rotation rate, rotation rate drop after a given measurement time, braking moment and braking power are determined. The three phase currents of the motor are detected during the free run operation. The run down search is initiated by switching the current in the natural zero crossing. During the measuring time, the clamp voltage amplitude and frequency are detected, digitised and stored. At least the rotation rate, the rotation rate decrease, the running rate, the braking moment and the braking power are calculated from the clamp voltage. Further parameters e.g. bearing and ventilator loss, as well as iron and friction loss, can be determined using motor specific models.