33kv Series Static Var Compensator Based On Mcr For Electric Arc Furnace - Chinaprice: contact company for price
Minimizing line loss
Increasing power transfer capability
Providing greater dynamic voltage control
Why choose SVC of MCR Type
High reliability: The SCR is installed in low voltage
circuit, not in main circuit, so, the withstanding voltage
is just 1% of main circuit voltage.
Low harmonic contents: THD is below of 5%, which comply with
related national criterion, if the multiple connections are
adopted, the THD can be reduced below of 1.2%.
Small dimension: the dimension of MCR is about 2/5 of TCR.
It can be able to connect in high voltage power grid, the
cost and floor space are reduced dramatically.
Fast response time(100~300ms), it can fully meet the demand
of dynamic reactive power compensation of power equipments.
No need of cooling devices, which reduce the fault rate,
maintenance cost and floor space.
The advantage of MCR-typed SVC
The MCR-typed SVC was based on traditional saturation
reactor technology; it was put forward by Russia scientists.
They introduced the concept of magnetic valve creatively to
just make the small section of iron core saturation, which
solved the high harmonic problems caused by traditional
saturation reactor, because all iron cores in traditional
saturation reactor are excessive saturation, then result in
nonlinear harmonic. At the same time, the SVC of MCR type
reduced the dimension, weight and noise of entire system; it
has many advantages, such as: low harmonics, fast response
time, high voltage withstanding level, stable operation,
small floor space and long service life. Therefore, the SVC
of MCR type is quickly spreading in Russia, Ukraine,
America, India, China and other countries. It plays a very
important role in improving power quality, decreasing
reactive power loss, stabilizing power grid voltage and
enhancing the reliability of power grid operation.Because
MCR-typed SVC adopted advanced micro-electronics technology,
it can regulate reactive power demand and compensation on
bus bar accurately:
The inductive reactive current in main circuit can be
adjusted through changing low voltage DC to regulate main
circuit impedance fast and smoothly, meanwhile, through
cooperating with capacitor bank paralleled in bus bar,
reactive power compensation demand can be realized on bus
bar, and dynamic response and improved power factor can
stabilize bus bar voltage.
Choosing reactor parameters properly connected in series
with capacitor bank, the compensation on fundamental wave
can be obtained, and the harmonic also can be filtered.
Because the SVC of MCR is free of frequent switching from
mechanical parts, then it avoids surge and over-voltage
impact caused by MSC, which enhances the reliability and the
service life of the equipment, as well, protects the other
The SVC of MCR type fully absorbed advantages and functions
of TCR-typed SVC by comparison; it solved the problems of
smooth regulation which can not be realized by MSC and TSC,
and also overcome some disadvantages of TCR-typed SVC.
Because the reactor is connected to high voltage main
circuit directly in series, it must stand extra high voltage
and ultra high voltage. At present, the highest voltage of
reactor in our country reach to 1000KV, and the maximum
capacity reach to 320MVar. The reactor also has over-load
function; it will not generate big damage to system except
heating, while, the thyristors in TCR-typed SVC is connected
to high voltage circuit directly, the over-voltage will
result in faults and break. So it is very stable for MCR-
typed SVC to operate under the high voltage circuit with
free of maintenance.
Frequently Asked Questions
A. The SVC of MCR type adopted iron core reactor, while TCR-
typed SVC adopted air-core reactor, if the loss of MCR-typed
SVC is higher than the loss of SVC with TCR typeC
At first appearance, it seems that the loss of MCR-typed SVC
is higher than the loss of SVC with TCR type because of its
iron core, but after respective loss analysis, we found:
Iron loss is lower compared with entire loss of SVC: the
entire loss of SVC is composed of iron loss, line loss
(copper line loss and aluminum line loss) and SCR heating
loss, the iron loss is not over 5% of entire loss; the iron
loss of ordinary transformer includes magnetic hysteresis
loss and eddy current loss, the magnetic hysteresis loss
takes up about 80%, while, the eddy current loss takes up
20%, because the working state of magnetically controlled
saturation reactor drifts off the zero flux point, it avoids
magnetic hysteresis loss, therefore, the iron loss of MCR is
just 30% of ordinary transformer iron loss, in addition,
iron loss is just 20% more of line loss, so, the iron loss
of MCR is very low.
The main loss of SVC are line loss and SCR heating loss, the
line loss of MCR and TCR is as below: First, TCR with air-
core adopted aluminum lines, MCR with iron core adopted
copper lines, the resistance of aluminum is bigger than the
resistance of copper, so the heat of aluminum is also
bigger. In addition, in terms of line length, we know from
the impedance formula of reactor: that the square of line
length is in inverse proportion to magnetic permeability of
medium under the same voltage and capacity. The magnetic
permeability of iron core is 2000~8000times of air magnetic
permeability, so the aluminum line of air-core reactor will
be many times of copper line of iron core reactor under the
same capacity (MCR also has a air gap, but it is very small
and just about several centimeters, and most of magnetic
circuits conduct in iron core ). The longer the aluminum
line is, the more the line loss is, in case the line loss
need to be decreased, the line cross section will be
increased, which will result in more investment, the cost
performance is very lower.
The SCR of TCR is connected in series to high voltage main
circuit and wants high power capacity; it will generate
heavy heating, so the complex and expensive cooling devices
are inevitable, while, the SCR of MCR is working under the
low voltage and small power, it is no need of cooling
devices except that the capacity of MCR-typed SVC is over
50Mvar, air cooling devices are enough.
In conclusion, the loss of MCR-typed SVC is very low and
just about 1/2 of TCR-typed SVC.
B. The SVC of MCR type adopted saturation reactor with iron
core, does it generate big noiseC
No matter transformer or reactor, they both generate noise,
but the main reason of noise is not because of saturation
(but of course, the higher the magnetic density, the bigger
the noise, but it can be decreased or eliminated by
technique improvement), it depends on manufacturing process.
At present, the transformer technology in China is becoming
more and more advanced; the noise of big transformer is
decreased below 70db, it fully complies with State
Environmental Protection Standards. We cooperate with the
first-class transformer/reactor manufacturer to control the
reactor noise below 70db.
Application industrial fields
A complete set of SVC system can be used to generate
constantly varied inductive and capacitive reactive power
with fast response time. So far, SVC system has been
extensively used in electric power system and industrial
field such as:
Rolling mill, Electric arc furnace and ladle furnace,
Electric railway traction substation, Hoists and other heavy
industrial loads, Long distance power transmission, Wind
power plant and Secondary substation (66KV to 110KV) Etc.
- Posted By: Zhuhai Wanlida Electric Co., Ltd.
- Phone: 867563395623
- Address: Wanlida Relay Protection Industrial Park, No. 1 Te, Zhuhai, China
- Website: http://www.zhwld.com/en
Published date: August 23, 2013 -
- Business Description: Incorporated in 1991, Zhuhai Wanlida Electric Co., Ltd. (www.zhwld.com)
('the Company'), is located in Relay Protection Industrial Park, No.1
Technology Road, Science and Technology Innovation Coast, High tech
Zone, Zhuhai City, coving a land area of approximately 60 thousand
square meters (including Park 1 and Park2). The Company was listed for
equity financing on November 13, 2007 (equity securities abbreviated as:
Wanlida stock certificates, code: 002180), with a registered capital of
124,980,000 Yuan. The Company keeps on her aggressive 'production,
study, research and application' co operation with the famous academies
such as Tsinghua University, Chinese Academy of Sciences and Central
China University of Science and Technology and carries out relevant
technology innovation. It is a national high tech enterprise that deals
with specialized development, production and sales of substation
integrated automation systems and Medium voltage variable frequency
drives, Medium voltage magnetically controlled soft starters, Static
synchronous compensator(STATCOM/SVG), Static VAR compensator(SVC),
Active power filter(APF/AHF), Thyristor switched capacitor bank
(TSC/TSF), High voltage direct current light transmission systems etc
power electronic equipments. In addition, the Company is known as a
famous manufacturer and backbone enterprise of transformer substation
integrated automation and power electronic equipments fields in China,
and it also acts as fresh blood in the field of energy conservation and
Wanlida passed the ISO9001 quality system certification, ISO14001 Environment Management System Certification and OHSMS18001 Occupation Health &Safety Management System Certification; All products passed the test of sated authoritative inspection bureau. And it had been rated as 'National High and New Technology Enterprise', 'Enterprise Recommended by State Economic and Trade Commission for Reconstruction of Urban and Rural Electric Grids', 'Key Software Enterprise Covered by National Program', 'Excellent enterprise of China', 'First choice Manufacturer for Electric Framework Protocol Sponsored by CNPC', 'Excellent Enterprise of Guangdong Province', 'Optimum Good faith Enterprise of Guangdong Province', 'Contract honoring Enterprise of Guangdong Province', 'Top 10 Private Enterprises of Zhuhai City', and 'Enterprise with Grade AAA Bank Credit '.
Wanlida has a very strong R&D teamwork which has a population of over 100 with doctor's degree, postgraduate degree and bachelor's degree etc, and all of the products are designed strictly according to IEC standards; Wanlida has modern standard workshops, it brought advanced SMT production lines and wave soldering machines into company from abroad, and built the first class high voltage and big capacity power electronic equipments assembling and test platform, which is able to realize full load test and ensure that all of products have exquisite technics and reliable quality; At present, Wanlida covers all of domestic areas except Hongkong, Macau and Taiwan, and it also sells the products to Southeast Asia, Middle East, South America, Africa etc over 20 countries.
The Company aims to grow into the most dedicated electric automation enterprise in the world, and commits itself to building the aircraft carrier of power electronic energy efficiency products.
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