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Portable Calibrator for DC Circuit Breakers.

Authors
Paice-DA
Source
NTIS: PB 297-732 :43 pages
Link
NIOSHTIC No.
10001204
Abstract
A portable calibrator to check the trip setting of DC circuit breakers within an accuracy of +/-5 pct was developed for the Bureau of Mines. The calibrator operates from a 300-volt DC trolley wire to provide controlled current pulses of 120 msec duration and continuously adjustable from 1,400 to 3,600 a. These current pulses enable a breaker DC trip current to be determined and subject the contacts to full current rating. The equipment is simple to use and weighs 86 lb. Connections are made with protected, clamp-on leads that are separately connected and weigh about 22 lb. An accurate calibration procedure takes less than 5 min to complete.
Publication Date
19780101
Document Type
CP; Final Contract Report;
Fiscal Year
1978
NTIS Accession No.
PB-297732
NTIS Price
A04
Identifying No.
OFR 73-79
NIOSH Division
PRC;
Source Name
NTIS: PB 297-732
Performing Organization
Westinghouse Electric Corp.
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division