1MDU07212-YN Rev. D Section 4
Protection and Control Function
REF601 / REJ601 / REM601 37
Application Manual
Where,
t = operate time in seconds
K = time multiplier
I = measured current value
Iset = set start current value
The slope of the time/current characteristics shall be determined by the
constants α and ß as indicated below:
Table 22: Values of constant α and β
Slope of the time/current curve set
4.14.3 ANSI C37.112 IDMT characteristic
The relationship between current and time for standard moderate inverse, normal
inverse, very inverse, extremely inverse complies with the ANSI C37.112
standards and can be expressed as follows:
Where:
Where,
t = operate time in seconds
K = time multiplier
I = measured current value
Iset = set start current value
The slope of the time/current characteristics shall be determined by the constants
and and as indicated below:
Table 23: Values of constant , and
Slope of the time/current curve set
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