EPS emergency power supply
classification and principle:
The EPS emergency power supply is English Emergency Power Supply abbreviation, is the modern
architecture safety control facility important constituent. The
ordinary circumstances is took the fire prevention or the production
the power source which uses in the emergency case. For example
in place person and so on high-rise construction, market, hospital
many, natural photosources limited, once appears the fire or the
electrical network receives destroys, the photosource vanishes a
blackness, brings the consequence will be inconceivable.
Simultaneously the fire pump, the emergency channel can because
of lack the power source to be unable to work, finally caused the fire
troop to be unable to display the rescue work, so aggravated the
disaster degree. If has the emergency power supply, will be able
to reduce the enormous loss, therefore emergency power supply to
modern society's safe display more and more vital role.
At present EPS uses the control mode and the control method are
different, brings the load in view of EPS to be allowed to induce
three kinds: One is mainly uses in the emergency lighting and
emergency lighting EPS; Two, besides emergency lighting,
emergency lighting, but also has applies to mix load and so on the air
conditioning, elevator, volume curtain gate, exhaust air blower, water
pump three-phase series EPS; Three is directly to electric motor
power supply frequency conversion series EPS.
The EPS emergency electric power supply system basic
structure composition may divide: 1st, the city electricity
bypass channel, 2, the inversion power source power supply channel 3, mutually throws the switching device 4,
?the /Y insulating transformer. As a result of EPS in view of
different load therefore system frame chart also different:
Lighting load EPS system diagram
When city electricity power supply normal, the city
electricity power source the power supply channel which composes after
the EPS exchange bypass and the change-over switch, as well as the
insulating transformer to user's each kind of emergency load power
supply. By now the user load used the power source was comes
from the electrical network city electricity power source, therefore
this time EPS could bring each resistance, 电容?and the inductive
load. When the city electricity power failure or the ultra time
limit, EPS in the very short time, completed from has exchanged the
bypass to supply power to the inversion battery power supply cut
operation, simultaneously started the contravariant unit thrust
build-up. The user load use power source is the process
insulating transformer EPS inversion power source. After city
electricity rehabilitation, EPS to inversion execution automatic pass
machine operation, and completes from the inversion battery power
supply to the exchange bypass power supply cut.
Mix load EPS system diagram
Mix load EPS generally is suitable with the load quite
complex situation, for instance guesthouse, hospital, large-scale
market and so on.
The electrical machinery special-purpose EPS power supply system
mainly is for the electrical machinery class load design, is widely
applied to the high efficiency electric motor load, for instance
elevator. Fire pump, large-scale air blower and so on.
EPS and UPS main difference
Mentioned EPS inevitably could think of UPS,
because EPS and UPS had the certain same spot in the application
aspect, therefore could have some confusions regarding this, here
simple introduction EPS and UPS main difference:
Using goal different: UPS besides provides the
uninterrupted power supply, but also had both the improvement city
electricity quality function, but EPS then mainly solves in the
emergency case emergency power supply question, request and fire
linkage. UPS power supply request cut time very short very short
(0 - 10ms), EPS then relative quite is wide (10-500ms). UPS
unimpededly maintains the intelligence transmission primarily to want
the goal, EPS to guard against the significant disaster accident
primarily to want the goal. EPS voltage degree of distortion THD
request in linear load next <1%, non-linear load next <3% But
UPS then <5%.
Reaches the EPS special-purpose frequency changer
parameter:
Reached the frequency changer mainly to take on the
contravariant function in EPS, reached the frequency changer main
increase automatic torque in view of EPS profession particular to
compensate, the torque compensates the limit, starts and so on the
parameter exceptionally again, satisfied the EPS customer the demand.
The automatic torque compensates originally is for promotes the
electric motor 大负?stage the torque to establish. Its
principle is when the electric motor 负载?increases, the
frequency changer basis establishes automatically promotes the
frequency changer the output voltage, counterbalances the excitation
which or in the partial counterbalances electric motor stator winding
resistance 电压降落 creates to be insufficient. In the EPS
application, the electric motor stator ohmic drop may approximately
correspond for from the frequency changer output knife net load entire
output process line loss. Through adjusts this parameter to be
allowed better suppression system 轻载 time voltage magnification
with heavy load time 电压降落.
The torque compensates the limit parameter is compensates the
gain coordination through the automatic torque to be allowed to
realize even more conforms to the EPS operational factor curve.
In EPS system because has the transformer as well as the filter
electric capacity and so on the middle link, from the frequency
changer knife load line 电压降落 and between the load current
relations certainly is not the ordinary electric motor winding
电压降落 and the stator current relations. Following chart:
Starts the parameter exceptionally again in the EPS
system application, the user hoped the frequency changer can the
maximum limit guarantee have the power output, namely under any
unusual condition, so long as the abnormal state promptly vanishes,
then can the self-recovery knife running status. Regarding this
reached the frequency changer to start number of times 2 with to start
the number of times regression time exceptionally again 2 to stipulate
exceptionally again did not include oc in view of the driver, ov, occ,
ocn, ocd as well as the BB all unusual conditions regression
parameter. In other words, after the user established started
parameter 2 exceptionally again, no matter occurred any exceptionally,
so long as has not damaged the frequency changer, after the frequency
changer all was allowed again the unusual condition to relieve the
self-recovery to the running status.
Conclusion:
Reached the EPS special-purpose frequency changer true
realization guest to make the service, completely developed according
to the EPS profession technical characteristic, has met the EPS
profession customer need. Reached the frequency changer and the
higher natural price ratio has received user's high praise by its
strict quality control.
Author synopsis:
In Liu Yuangang reached the electricity to pass
limited liability company Engineer AMD product place |
