Application Scope
The rated power of SMW1(DW45) Series Intelligent All-Purpose Type
Circuit Breaker(referred to as circuit breaker hereinafter)is kind
of breaker with AC 50Hz,400V,or 690V,and its rated current is
400-6300A.It is mainly used in power distribution network to
allocate electric power and protect the line and supply equipment
against overload,under voltage,short circuit,single phase grounding
fault,etc.The core part of the circuit breaker adopts intelligent
type dropout device,which bears accurate alternative protection
performance and can avoid unnecessary power failure,thus improve
the reliability of power supply.
Structure Character
The product has two types of structure,namely,fixed type,which is
mainly composed of contactor part,intelligent drop-out
device,manual operation mechanism,electric operation
mechanism,electric operation mechanism and drawer base.
The circuit breaker is placed in three-D pattern and is
characterized by its tight structure and small volume.The contactor
part is sealed in the insulation bottom plate,and contactors of
every phase are separated with insulation board,hence several
little chambers;while the intelligent dropout device,the
manual-operation mechanism,and the electric operation mechanism are
arranged before it in good order and form independent unit
respectively.In case one of the units is damaged,it can be
dismounted wholly to fix a new one.Among which:
1.Contactor part:AS one-step contactor is adopted,operating
strength of the contactor is reduced because of the omitting of arc
contactor transfer process,and the breaking process of
short-circuit current is therefore accelerated.In order to reduce
the electric repelling force among contactors and improve the
electric stability of the contactor part,the contactor part adopts
multi-way parallel connection.Welding connects the contactor,soft
joint and bus bar,seeing that it can reduce contact resistance and
decrease power consumption.
2.Arc extinguish chamber:the wall of arc extinguish chamber is made
of compressed insulation material,and arc extinguish fence is
mounted in the chamber to enable the electric arc blow upward into
the chamber.
3.Base:contactor and arc extinguish system are both placed between
the upper and lower base,which are made of compressed insulation
materials with high intensity and excellent electric
performance.Every phase is designed into independent small
chamber,and the contactor is mounted on the insulation support,thus
short circuit among phases is not likely to happen,and the gas
generated when breaking the short-circuit current won't eject
downward.The design can ensure reliable breaking when wire is
lowery input.
4.Operation mechanism:Operation mechanism is made of two
types,manual operation type and dynamo-driven type,which are both
fixed on the insulation base and are at are at front side of the
circuit breaker.The operation mechanism adopts free drop-out
mechanism that changes four-pole into five-pole.To meet the
requirement of auto control,the mechanism is designed into the type
of presorted energy.In the operation of the circuit breaker,the
mechanism is always in the state and position of presorted
energy,and once closing order is received,the circuit breaker can
close instantly.Release the mechanism is always in the state and
position of presorted energy,and once closing order is received,the
circuit breaker can close instantly. Release of the pressorted
energy can be performed with manual-releasing button or releasing
electromagnet, and remote control may also be adopted.
5. Functions of intelligent type drop-out device are as
follows:(1)protection against overload long time-relay counter time
limit, short time-relay counter time limit, and instant operation,
etc; it can be set by users according to practical requirement;
(2)Protection against grounding fault; (3)overload alarm;
(4)testing; (5)load monitor; (6)display; (7)auto checkout; (8)MCR
function; (9)thermo-analogue; (10)contactor wear indication;
(11)fault record; (12)intelligent dropout device has L
type(economic type), M type(ordinary type),and H type(with
communication port type).
