Figure 276: Functional module diagram
Voltage detector
This module supervises voltage presence status value of a load switch or a circuit
breaker. The
Voltage selection setting is used for selecting the phase-to-earth or
phase-to-phase voltages for voltage detection, and the
Phase supervision setting
defines which phase or phases are monitored. The measured voltages are compared
with threshold settings.
If the measured voltage is larger than the limit value set by
V live value setting
and high voltage lasts longer than the time set by
V live time setting, the voltage
presence is interpreted as live. The corresponding phase specific output indicating
live situation is activated. Phase status is also reported to the phase selection logic
module.
Once the voltage is lower than setting
V live value, corresponding phase specific
output is deactivated and voltage live timer is reset.
If the measured voltage is lower than setting
V dead value and low voltage situation
lasts longer than the time set by
V dead time setting, the voltage presence is
interpreted as dead. The corresponding phase specific output indicating dead
situation is activated. Phase status is also reported to the phase selection logic
module.
Once the voltage is larger than setting
V dead value, the corresponding phase
specific output is deactivated and voltage dead timer is reset.
The
Relative hysteresis setting can be used for preventing unnecessary oscillations
if the input signal varies slightly above or below the threshold setting. After leaving
the hysteresis area, the start condition has to be fulfilled again and it is not
sufficient for the signal to only return back to the hysteresis area.
The activation of the
BLOCK
input deactivates all outputs and resets internal timers.
1MRS758755 C
Supervision functions
REC615 & RER615
Technical Manual
547
Содержание Relion REC615
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