> Enterprise's process control system, the upscale
precision instrument, the computer network, the financial processing
system is more and more high to the electric power supply quality
request, the UPS (UPS) obtains the widespread application.
Article introduction true on-line UPS and general UPS product
difference; The single-phase modern age high frequency machine
compares with the true on-line UPS technology as well as uses 逐波
limits flows technical UPS and the traditional PWM control UPS
difference.
Is more and more high along with petroleum chemical industry
each installment to the electric power supply quality requirement, the
UPS starts to apply to certain chemical chemical fiber important
installments, like this, both has satisfied the power supply
reliability request, and practically improved the power supply
quality, strengthened the system antijamming ability, deeply user's
favour. But, UPS in market variety many, whether has the user
bought the genuine goods at reasonable prices to be true on-line
controls UPS as well as whether the practical solution power supply
system existence several kind of forms disturbances: Namely the
power source severance, the voltage drop, the surge voltage, the noise
voltage, the voltage transient, has pressed, owes the pressure, the
peak voltage, waits for each installment technical personnel strictly
to distinguish. According to the related technical organization
statistics, the electric power supply reliability reaches 9919 %,
possibly produces 825 min power cut,99199 every year % to have 25 min
power cut, even if reaches 991999 %, also can have 5 min power cut.
An American authoritative magazine once made in 1996 counts,5
min the power cut, will cause several million US dollars losses to the
financial system, the loss greatly surpasses average person's
imagination, demonstrated after the incomplete statistics material,
the equipment damaged 4513 % to come from the power source sudden
stop, obviously its hazardous nature was specially big.
1 on-line UPS and general UPS product difference
True on-line UPS refers to UPS the main working part
Inverter inversion to occupy for a long time the work running status,
it to composes this part electronic component as well as the active
status all has the strict special request, also the construction cost
relative is also higher, but it may in the environment bad local work.
Somewhat supplies goods business on-line -like, on-line reserve,
the on-line interaction type and so on, generally said is on-line UPS.
This kind of product may be supposed to use in the trade class
to calculate place and so on engine room, but it to power supply
quality requirement higher, thus its construction cost is lower,
deeply is welcome some users. This kind of product
characteristic is: The request power line voltage between 200 ~
240 V, can achieve the constant voltage function, once the voltage
deviation surpasses this scope, then the working condition must
transform to by the battery power supply, battery long-term
The charge, the electric discharge work, causes the
battery damage, the life 减短, the about 2 ~ 3 years must trade the
battery. This kind of typical representative for uses Deltec
three ports electric circuits UPS, its constant voltage best scope is
220V ±10 %, also only can solve 5 kind of power supplies problems.
The author believed that, it is only suitable for the general
place, respectively produces the equipment regarding the
petrochemistry enterprise to have discretely to use. Because its
output wave shape most is the square-wave, to the essential equipment
said the reliability can reduce, simultaneously because this kind of
UPS work frequency low, dynamic performance worse, moreover the
inversion is works in the short time, power and radiation design
content smaller, the is more true than on-line UPS reliability to have
to lower a lot, therefore absolutely cannot be able the accuracy
control output voltage and the frequency places on a par with true
on-line UPS.
2 single-phase modern ages high frequency machine and true
on-line UPS technology comparison table 1
Single-phase modern age high frequency machine and true
on-line UPS technology ratio
.
3 逐波 limits flows technical UPS and traditional PWM
controls UPS the difference
Ministry of Chemical Industry introduces the
acetaldehyde installment has 逐波 limits flows technical UPS, this
equipment because has uniquely overloads by the pulse and
short-circuits the preservation technology, namely PUISE BY PUISE,
protects ability Canada
Strong, enhanced the equipment movement reliability.
The PWM technology severs the power flow and the control
occupies the spatial ratio method
Transforms the power, it works in 20kHz under ~ 200kHz
turn-on frequency. This kind of technical characteristic is the
electric circuit simple, is easy to control, therefore in the low
power variable current technology, the PWM technology occupies the
dominant status. Its shortcoming is, after the turn-on frequency
increase, the switch loses can increase, mainly is the power
transformer leaks the feeling to cause shuts off the loss, it can
affect the power source the reliability. More prominent is as a
result of its itself limitation, overloads when the phylogeny or
short-circuits, through transformer examination electric current, when
examines has been to flows or the big electric current time is longer,
the control system is unable in the extremely short time to make the
judgement, so the malignancy circulation, after wants when to send out
several pulses only then really to examine the big electric current,
but the inversion power tube extremely has the possibility in to burn
out in this time, see Figure 1.
Ministry of Chemical Industry uses 20kVA UPS, has, the perfect
overload outstanding with short-circuits the protection function, this
system besides uses 16 high performances monolithic integrated
circuits to strengthen the real-time fast examination and the control,
but also succeeds in the 20kHz level using PULS BY the PULSE 逐波
pulse limits flows the technology, guaranteed the single pulse
short-circuit current in the IGBT permission scope, also most greatly
the short-circuit current does not surpass the single pulse electric
current to limit by the pulse flows the side
The document, enables UPS automatically to have
short-circuits the protection function, overloads or the load impact
to the short time has the automatic resistance, namely overloads
besides the long time does not need to transfer the bypass, more
importantly effectively safeguards
The inversion is safe, chart 2, chart 3 is its schematic
diagram.
4 subtotals
A. or short-circuits the time in the overload, t1
examines first to surpass the guard wire pulse signal, enters the
actuation board Enable reaction rate to be very quick, CPU counts
Delta t1 = t1 - t0b1 to enter the second stage, Delta t1 = t3 - t2
approximately several ms level, also duplicates examines has been to
flows or short-circuits the signal, duplicates the first process once
more, the signal input actuation board, Enable CPU accumulates once
more.
C. so passes through 5 round, may determine this time has flowed
or short-circuits the value to surpass the guard wire stipulation
value, IGBT shuts off UPS, the equipment transfers the bypass to
supply power,5 times of processes in 20 ms.
D1 because the inversion has flowed either the short-circuit
current examination uses the Hall part or the resistance, also
original side directly examines in the inversion, thus examines
Measured the speed is extremely quick, therefore when
really has been occurring flows or short-circuits surpasses the
hypothesis protection value, promptly shuts off the inversion power
tube, implements the effective protection to UPS, may meet the user
actual needs, has solved the technical question which formerly
existed.
E1 regarding the enterprise process control system, the upscale
precision instrument, the computer network, the financial processing
system in selects time UPS must be especially prudent. The
author suggested the engineers and technicians select genuine on-line
line type UPS only then to guarantee the equipment peaceful, steady,
long, is full, superiorly moves, high speed continues for the
petrochemistry enterprise to develop provides the reliable guarantee.
5 conclusions
Through this project development, in the conventional
acrylic fiber experimental spinning installment, acquires the few
essential equipment, according to this project determination craft
route, the mixed mode, the proportion of mixture, increases into a
quota to have the far infrared radiative ceramics particle, after may
spin generating to conform to the spinning and weaving to process the
request to have the far infrared radiation function acrylic fiber
textile fiber. And its craft route and the Shanghai
petrification joint-stock company acrylic fiber department industry
big production system extremely approaches, to transplants has the
instruction significance to the industry big production, is playing
the vital role to the big production adjustment product structure.
Also has provided the direction for the experimental installment
transformation.
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