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1. CA1244084 - PORTABLE TESTER AND RELATED METHOD FOR DETERMINING THE PRIMARY WINDING TO SECONDARY WINDING CURRENT RATIO OF AN IN-SERVICE CURRENT TRANSFORMER

Office Canada
Application Number 507818
Application Date 29.04.1986
Publication Number 1244084
Publication Date 01.11.1988
Grant Number
Grant Date 01.11.1988
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
G01R 7/00
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
7Instruments capable of converting two or more currents or voltages into a single mechanical displacement
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
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 IN-SERVICE CURRENT TRANSFORMER
(FR) APPAREIL D'ESSAI PORTATIF ET METHODE CONNEXE POUR DETERMINER LE RAPPORT COURANT SECONDAIRE-COURANT PRIMAIRE D'UN TRANSFORMATEUR DE COURANT EN SERVICE
Abstract
(EN)
ABSTRACT OF THE INVENTION A portable tester for determining the primary winding to secondary winding current ratio of a current transformer while that transformer is in service, including a current probe having a split core positionable around an active power line supplying current to the transformer, an AC to DC converter to convert the AC output of that probe to a first DC signal, another AC to DC converter for converting the secondary output of the current transformer under test to a second DC signal, and a ratio meter for converting the first and second DC signal into a visual dis- play of the ratio of those signals. A mechanism is provided for assuring proper location of the decimal point on the ratio meter. Polarity and burden testing is also provided.