Siemens Reyrolle 7SR46 - 81 HBL2 2 Nd Harmonic Block;Inrush Restraint

81HBL2 2
nd
Harmonic Block/Inrush Restraint
81HBL2 Inrush setting (ratio of 2
nd
harmonic current
to fundamental component current)
0.10 ⋅ I to 0.50 ⋅ I
Where I = I
2
/I
1
81HBL2 Inrush release block 0.30 ⋅ I
s
to 20 ⋅ I
s
Element basic operate time (t
basic
) Picks up before operation of any protection element
due to magnetic-inrush current
Reset time Operates until drop-off of any protection element due
to magnetic inrush current
2
nd
harmonic measurement accuracy is affected by the selected specific CT. Minimum 2
nd
harmonic current is
15% ⋅ I
smin
.
CT Type I
s
Range I
smin
Minimum 2
nd
Harmonic
CT01 8 A to 28 A 8 A 1.2 A
CT02 16 A to 56 A 16 A 2.4 A
CT03 32 A to 112 A 32 A 4.8 A
CT04 64 A to 224 A 64 A 9.6 A
CT05 128 A to 448 A 128 A 19.2 A
CT06 256 A to 896 A 256 A 38.4 A
4.7
Technical Data
4.7 81HBL2 2
nd
Harmonic Block/Inrush Restraint
68 Reyrolle, 7SR46 Device, Manual
C53000-G7040-C103-1, Edition 10.2022