Development and application of a 10 MHz digital system for current-zero measurements

Author

Damstra, G.C. ; Kertesz, V.

Author_Institution

NV Kema, Arnhem, Netherlands

Volume

142

Issue

2

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

125

Lastpage

132

Abstract

After a short historical review, the development of an accurate digital system is described that is intended for measurement of arc currents and voltages in the current-zero period of circuit breakers during high-power tests. Two channels with 12-bit resolution and 10 M samples per second can each store 4 K of data using 400 μs. The transmitting unit is battery operated near to the test object, free from ground. The receiving unit is at ground potential, coupled by an optic fibre synchronous link. As a current device, an M coil is applied to measure the derivative of the current. For the voltage device, a special capacitive divider has been developed. Results of current-zero tests in vacuum and SF₆ circuit breakers are presented and discussed

Keywords

analogue-digital conversion; digital instrumentation; electric current measurement; gas blast circuit breakers; switchgear testing; vacuum circuit breakers; voltage measurement; 10 MHz; 4 kbit; 400 mus; SF₆; SF₆ circuit breakers; arc currents; capacitive divider; circuit breakers; current-zero measurements; current-zero tests; derivative current; digital system; high-power tests; optic fibre synchronous link; receiving unit; transmitting unit; vacuum; voltages;

fLanguage

English

Journal_Title

Science, Measurement and Technology, IEE Proceedings -

Publisher

iet

ISSN

1350-2344

Type

jour

DOI

10.1049/ip-smt:19951441

Filename

376927