9.3
Voltage based inverse definite minimum time
characteristics
9.3.1
IDMT curves for overvoltage protection
In inverse-time modes, the operate time depends on the momentary value of the
voltage, the higher the voltage, the faster the operate time. The operate time
calculation or integration starts immediately when the voltage exceeds the set value of
the
Start value
setting and the
START
output is activated.
The
OPERATE
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 operate time
setting defines the minimum operate time for the IDMT
mode, that is, it is possible to limit the IDMT based operate time for not becoming too
short. For example:
1MRS757454 D
Section 9
General function block features
611 series
475
Technical Manual
Summary of Contents for Relion 611 Series
Page 1: ... RELION PROTECTION AND CONTROL 611 series Technical Manual ...
Page 2: ......
Page 22: ...16 ...
Page 30: ...24 ...
Page 308: ...302 ...
Page 400: ...394 ...
Page 506: ...500 ...
Page 516: ...510 ...
Page 522: ...516 ...
Page 528: ...522 ...
Page 533: ...527 ...
Page 534: ......
Page 535: ......