BS 142-2.3(1991) : 1991
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
ELECTRICAL PROTECTION RELAYS - REQUIREMENTS FOR THE PRINCIPAL FAMILIES OF PROTECTION RELAYS - SPECIFICATION FOR THERMAL ELECTRICAL RELAYS
Hardcopy , PDF
15-08-1997
English
01-01-1991
Committees responsible
National foreword
Specification
Section one. General
1 Scope and object
2 Definitions
Section two. Requirements
3 Standard values
4 Accuracy
Section three. Test methods
5 Tests related to operating characteristics and
accuracy
6 Tests for thermal requirements
Appendices
A Characteristic curves, cold curves
B Characteristic cures, hot curves
C Example for determining accuracy
Tables
1 Reference conditions and test tolerances of
influencing quantities and factors
2 Previous current values when measuring the effect of
influencing quantities
3 Standard reference conditions and test tolerances of
correcting quantities when measuring the effect of
influencing quantities
4 Standard values of the limits of the nominal ranges
of influencing quantities and factors
5 Standard values of the limits of the nominal range of
previous current values
6 Standard values of the limits of the nominal range of
correcting quantities
Figures
1 Test circuit for determining the minimum operating
current and the cold characteristic
2 Test circuit for determining the hot characteristics
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