Section 4
1MAC050144-MB C
Protection functions
220
615 series ANSI
Technical Manual
4.1.13.4
Operation Principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
The operation of the phase undercurrent protection can be described with a module
diagram. All the modules in the diagram are explained in the next sections.
Figure 104:
Functional module diagram
Level detector 1
The IED does not accept the
Pickup value
to be smaller than
Current block value
.
This module compares the phase currents (RMS value) to the
Pickup value
setting. The
Operation mode
setting can be used to select the "Three Phase" or "Single Phase" mode.
If in the "Three Phase" mode all the phase current values are less than the value of the
Pickup value
setting, the condition is detected and an enabling signal is sent to the timer.
This signal is disabled after one or several phase currents have exceeded the set
Pickup
value
value of the element.
If in the "Single Phase" mode any of the phase current values are less than the value of the
Pickup value
setting, the condition is detected and an enabling signal is sent to the timer.
This signal is disabled after all the phase currents have exceeded the set
Pickup value
value
of the element.
The IED does not accept the Pickup value to be smaller than Current block
value.
Содержание 615 Series ANSI
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