1MAC050144-MB C
Section 11
General function block features
615 series ANSI
663
Technical Manual
11.3
Voltage based inverse definite minimum time
characteristics
11.3.1
IDMT curves for overvoltage protection
In inverse-time modes, the trip time depends on the momentary value of the voltage, the
higher the voltage, the faster the trip time. The trip time calculation or integration starts
immediately when the voltage exceeds the set value of the
Pickup value
setting and the
PICKUP
output is activated.
The
TRIP
output of the component is activated when the cumulative sum of the integrator
calculating the overvoltage situation exceeds the value set by the inverse time mode. The
set value depends on the selected curve type and the setting values used. The user
determines the curve scaling with the
Time multiplier
setting.
The
Minimum trip time
setting defines the minimum trip time for the IDMT mode, that is,
it is possible to limit the IDMT based trip time for not becoming too short. For example:
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
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Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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