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1. AU1986058118 - Portable tester and related method for determining the primary winding to secondary winding current ratio of an inservice current transformer

Office Australia
Application Number 58118/86
Application Date 24.04.1986
Publication Number 1986058118
Publication Date 09.04.1987
Publication Kind A
IPC
G01R 31/06
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
02Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
06Testing of electric windings, e.g. for polarity
CPC
G01R 29/20
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
29Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
20Measuring number of turns; Measuring transformation ratio or coupling factor of windings
G01R 31/62
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
62Testing of transformers
G01R 35/02
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
35Testing or calibrating of apparatus covered by the preceding groups
02of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Applicants Special Instruments Laboratory, Inc.
Inventors Crawford, Tullus E.
Riley, Claude R Jr.
Priority Data 06728194 29.04.1985 US
Title
(EN) Portable tester and related method for determining the primary winding to secondary winding current ratio of an inservice current transformer
Abstract
(EN)
A portable tester for determining the primary winding (18) to secondary winding (22) current ratio of a current transformer (16) while that transformer is in service, including a current probe (40) having a split core positionable around an active power line (14) supplying current to the transformer, an AC to DC converter (44) to convert the AC output of that probe to a first DC signal, another AC to DC converter (56) for converting the secondary output of the current transformer under test to a second DC signal, and a ratio meter (46) for converting the first and second DC signals into a visual display of the ratio of those signals. A mechanism (42) is provided for assuring proper location of the decimal point on the ratio meter. Polarity and burden testing is also provided.