1MAC050144-MB C
Section 11
General function block features
615 series ANSI
635
Technical Manual
Figure 339:
Trip time curves based on IDMT characteristic with the value of the
Minimum trip time
setting = 1 second
11.2.1.1
Standard inverse-time characteristics
For inverse-time operation, both IEC and ANSI/IEEE standardized inverse-time
characteristics are supported.
The trip times for the ANSI and IEC IDMT curves are defined with the coefficients A, B
and C.
The values of the coefficients can be calculated according to the formula:
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