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1. WO2015145110 - APPARATUS AND METHODS FOR MEASURING ELECTRICAL CURRENT

Publication Number WO/2015/145110
Publication Date 01.10.2015
International Application No. PCT/GB2015/050759
International Filing Date 16.03.2015
IPC
G01R 19/00 2006.1
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
19Arrangements for measuring currents or voltages or for indicating presence or sign thereof
G01R 27/26 2006.1
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
27Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
26Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants
G01R 31/02 2006.1
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
CPC
G01R 19/0023
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
19Arrangements for measuring currents or voltages or for indicating presence or sign thereof
0023Measuring currents or voltages from sources with high internal resistance by means of measuring circuits with high input impedance, e.g. OP-amplifiers
G01R 19/0092
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
19Arrangements for measuring currents or voltages or for indicating presence or sign thereof
0092measuring current only
G01R 27/02
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
27Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
G01R 27/2611
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
27Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
26Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; ; Measuring impedance or related variables
2611Measuring inductance
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
H03F 2200/261
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2200Indexing scheme relating to amplifiers
261Amplifier which being suitable for instrumentation applications
Applicants
  • VOLTECH INSTRUMENTS, LTD. [GB]/[GB]
Inventors
  • FORD, John Stewart
  • IND, Lionel
Agents
  • FORSYTHE, Dominic
Priority Data
1405332.625.03.2014GB
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) APPARATUS AND METHODS FOR MEASURING ELECTRICAL CURRENT
(FR) APPAREIL ET PROCÉDÉS DE MESURE DE COURANT ÉLECTRIQUE
Abstract
(EN) Methods and apparatus are disclosed for measuring an electrical current, particularly an AC electrical current, for example to measure a frequency response of a transformer. In a disclosed arrangement, a connection is made of a current input terminal for receiving a current to be measured to an input terminal of a differential amplifier via a portion of a resistive network. The resistive network holds the current input terminal at a ground voltage and the two input terminals of the amplifier at a common finite voltage above the ground voltage. The amplifier provides as output a measure of the current to be measured.
(FR) L'invention concerne des procédés et un appareil destinés à mesurer un courant électrique, en particulier un courant électrique alternatif, par exemple pour mesurer une réponse en fréquence d'un transformateur. Dans un agencement décrit, une connexion est établie d'une borne d'entrée de courant servant à recevoir un courant à mesurer vers une borne d'entrée d'un amplificateur différentiel via une partie d'un réseau résistif. Le réseau résistif maintient la borne d'entrée de courant à une tension de terre et les deux bornes d'entrée de l'amplificateur à une tension commune finie supérieure à la tension de terre. L'amplificateur délivre en sortie une mesure du courant à mesurer.
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