ABB 615 series Technical Manual page 469

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1MAC059074-MB A
615 series ANSI
Technical Manual
PROT_ACTIVE
ENABLE OPERATION
(from Fail safe function)
BLOCK_LS
I_DIFF
(from Differential calculation)
I_BIAS
(from Differential calculation)
RSTD2H_LOC
(from Inrush detector)
RSTD2H_REM
(from Inrush detector)
End section 1
Slope section 2
End section 2
Slope section 3
Low trip value
GUID-02958DCF-AC09-4D58-B5B4-2016691C7DC2 V1 EN
Figure 222:
Operation logic of the stabilized low stage
The stabilization affects the operation of the function.
Id/Ir
High trip value
TRIP
AREA (LS)
Slope
section 2
(S2)
Low trip value
I
d_lim
End section 1 (B1)
GUID-193E5367-5910-4F1E-A6B1-7D5E8A35C94C V1 EN
Figure 223:
Operating characteristics of the protection. (LS) stands for the low stage
and (HS) for the high stage.
The slope of the operating characteristic curve of the differential function varies in the
different sections of the range:
Section 1 where 0.0 < I
tripping is constant. The value of the differential current is the same as the basic
setting (Low trip value) selected for the function. The basic setting allows the
Charact.
I
I
bias
Operating curve type
Trip delay time
Reset delay time
Minimum operate
time
Time multiplier
TRIP
AREA (LS &HS)
Slope
section 3
(S3)
End section 2 (B2)
/I
< End section 1. The differential current required for
b
r
Protection functions
Timer
OPR_LS_LOC
t
t
STR_LS_LOC
TRIP AREA (HS)
NON-TRIP AREA (LS)
NON-TRIP
AREA (LS & HS)
Section 4
Ib/Ir
463

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