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TRIP
Level
detector
I_A
I_B
I_C
BLOCK
PICKUP
Blocking
logic
ENA_MULT
t
Timer
t
Directional
calculation
V_A_AB
V_B_BC
V_C_CA
Phase
selection
logic
I
2
V
2
V
1
NON_DIR
GUID-92621351-8DF2-4606-A043-F79C018C12A4 V2 EN
Figure 112:
Functional module diagram
Directional calculation
The directional calculation compares the current phasors to the polarizing phasor. A
suitable polarization quantity can be selected from the different polarization quantities,
which are the positive sequence voltage, negative sequence voltage, self-polarizing
(faulted) voltage and cross-polarizing voltages (healthy voltages). The polarizing method
is defined with the
Pol quantity
setting.
Table 235:
Polarizing quantities
Polarizing quantity
Description
Pos. seq. volt
Positive sequence voltage
Neg. seq. volt
Negative sequence voltage
Self pol
Self polarization
Cross pol
Cross polarization
The directional operation can be selected with the
Directional mode
setting. The user can
select either "Non-directional", "Forward" or "Reverse" operation. By setting the value of
Allow Non Dir
to "True", the non-directional operation is allowed when the directional
information is invalid.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
233
Technical Manual
Содержание Relion 615 series
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