Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Reexamination Certificate
2005-08-09
2005-08-09
Nolan, Jr., Charles H. (Department: 2854)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
C324S551000
Reexamination Certificate
active
06927562
ABSTRACT:
Measurement of power factor to diagnose the condition of high powered stand-off insulators, which include a roll of insulating material carrying an intermediate layer of conductor between layers of the insulating material around a central HV conductor in a hollow insulator body, is accomplished while the power system is subject to full voltage. Coupling means provides a capacitive voltage divider with a tap at a low voltage point on the conductor within the insulator structure. The divider with the coupling means is also provided with an external low voltage connector and a ground connector. A computer is connected to the external connections of the coupling means and contains software to convert a received analog signal to digital, and subject the digital signal to a fast Fourier transform analysis to produce an output signal representative of the power factor. The computer is arranged to calculate, process and store the bushing insulator power factor at periodic intervals. The invention also involves a method of measuring power factor in an insulation structure as described and then involving disconnecting high power from the HP equipment. A connection is made from a conductive capacitive layer at the low voltage end of the insulation roll in the bushing to a capacitive voltage divider in a bushing tap coupler to provide an output from the coupler on the order of household voltage when HV is reconnected to the equipment. Low voltage from the coupler to a further voltage divider circuit further reduces the voltage at the output to a level acceptable to a computer. The high power is then reconnected to the equipment so the computer voltage is available on demand at the output of the measuring equipment. The invention also provides a method of testing HV insulators as described by providing low voltage output across a passage divider from a tap to the conductive capacitive layer at the low voltage end of the conductor within the insulation roll within the bushing. The bushing tap coupler is connected to a voltage reduction circuit to reduce voltage to a level acceptable to a computer.
REFERENCES:
patent: 4419619 (1983-12-01), Jindrick et al.
patent: 4757263 (1988-07-01), Cummings et al.
patent: 4801937 (1989-01-01), Fernandes
patent: 5303164 (1994-04-01), Masson et al.
patent: 5539655 (1996-07-01), Sato
patent: 5640154 (1997-06-01), Meyer et al.
patent: 5652521 (1997-07-01), Meyer
patent: 6028430 (2000-02-01), Frielingsdorf
patent: 6141230 (2000-10-01), Sum
patent: 6177803 (2001-01-01), Train et al.
patent: 6433557 (2002-08-01), Rashkes et al.
patent: 2002/0074156 (2002-06-01), Forster
patent: 2002/0079903 (2002-06-01), Smith et al.
patent: 2002/0079906 (2002-06-01), Rashkes et al.
patent: 2004/0046531 (2004-03-01), Ferraro et al.
patent: 09182294 (1997-07-01), None
CEI/IEC 61010-1 (second edition 2001-2), pp. 1,3,5-6,9,19,39,43,45,61,65,67.
Anand Ramesh
Benach Jeffrey D.
Cimini Emidio
Heyneke Jan C.
Dann Dorfman Herrell and Skillman, P.C.
Nolan, Jr. Charles H.
On-Line Monitoring, Inc.
LandOfFree
Power factor/tan δtesting of high voltage bushings on... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power factor/tan δtesting of high voltage bushings on..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power factor/tan δtesting of high voltage bushings on... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3473097