User Manual 55User Manual 54
Overview
LI Protection
All power circuit breakers are equipped with a
replaceable smart unit. The smart unit is specially
designed to protect power systems and loads. It is
applicable to 50/60Hz power grids and mainly used
for power distribution and feeder protection, to
protect lines and power supplies from overload,
short circuit, ground-fault, current imbalance,
over-frequency, under-frequency, reverse power
and other faults. Due to the load monitoring,
demand protection and zone-selective interlocking,
the power grid can work reasonably. The smart unit
can also be used to measure the current, voltage,
power, frequency, electric energy, demand, harmon-
ics and other parameters of grid nodes, and record
and maintenance parameters such as the fault,
alarm, operation, maximum current history and
switch contact wear. When the power grid is subject
to communication networking, the controller can
be used as a remote terminal of the power automa-
tion network for remote metering, signaling, con-
trol, regulation etc. In addition, the controller sup-
ports multiple protocols to meet various network-
ing requirements.
Table of Models
M A H
2.0N
3.0N
4.0N
Table of Models
a
2: LI protection
3: LSI protection
4: LSIG protection
Design version
b
Protection type
Measurement type
Naming of Smart Unit
Smart Unit 2.0
3 . 0 A
a b c
LSI Protection
Smart Unit 3.0
LSIG Protection
Smart Unit 4.0
Profile of SUProfile of SU
c
Basic type M
Ammeter type A
Harmonics type H
Note: M type is LED display; A and H types are
LCD display.
Distinguish the design version of the smart unit. ā0ā means the
first version.
Smart Unit
C
M
Y
CM
MY
CY
CMY
K
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