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ECØVAR is a product backed by 30
years of rich and dedicated experience of technocrats
who have worked on and excelled in application
engineering, design, manufacture and installation of
power capacitors & reactive power compensation equipment
for transmission networks upto 145 kV. This brochure
elaborates the details of our manufacturing technology,
material inputs fusing techniques, economics of
installation & operation, configuring options, with
relevant protection schemes and switching /
protection accessories that are within our current
engineering capabilities
HP Capacitors
Bank & Harmonic Filter Installations with Reactors
General
ECØVAR High Voltage Power
Capacitors are manufactures at our Sinnar Plant in
India, which is an ISO-9000 accredited facility & houses
a computer aided design, manufacturing, processing and
testing infrastructure that ensures all products
manufactured strictly comply with domestic and
international standards and perform to the highest
levels of safety reliability and life expectancy
Technology and
basic construction
Amongst most electrical products, Power Capacitors are
highly susceptible to premature failures if improperly
installed or if the application or load profiles are
non-linear or the system parameters are erratic. It is
therefore of utmost importance that capacitors are
designed to perform under such onerous conditions. Hence
material selection, quality inputs, design,
manufacturing and processing parameters assume critical
importance. High Voltage Power Capacitors
are manufactured from raw material inputs sourced from
the world's foremost manufacturers of plastic film
dielectrics, aluminum electrode foils, and electrical
insulating fluids. ECØVAR
Capacitors generally utilize the following raw
materials, unless special end use applications
necessitate use of alternative material : 
Dielectric: Electrical Grade Double-Side-Hazy Biaxial
Oriented Polypropylene Film.
Electrode : High Purity Soft Annealed Aluminum Foil.
Impregnate : Phenyl Xylyl Ethane (PXE), Non-PCB, Non
Toxic, Biodegradable.
Housing : Stainless Steel/Mild Steel Sheet.
Bushings : Soldered or Welded, Brown/Gray, Glazed
Porcelain Insulators.
Exterior finish: Etched Primer with Final Coats of Epoxy
Paint.
Power Loss
ECØVAR Power Capacitors are
uniquely designed to deliver optimum performance at very
economic operating cost, viz. power loss which are
limited to maximum of 0.12 Watts / kVAr on start-up and
0.1 Watts / kVAr after 500 hrs of operation. The
extremely low watt losses contribute significantly in
enhancing the capacitor life expectancy levels.
Fusing Techniques
INTERNAL FUSE DESIGN:
EC0VAR Capacitor units are generally provided with
internal fuses across each element for rendering
internal protection to the capacitor unit in case of a
fault occuring within the element winding. These fuses
are designed on the basis of stored energy principle and
coordinated to withstand all normal and some abnormal
system overloads and disturbances and to render overall
unit protection. (Refer to detailed internal fuse
technical write-up available on request.) EC0VAR
Capacitor units are also offered with option of
conventional external fuses (Expulsion type / HRC type)
depending on the unit kVAr rating as also application
and severity of protection required.
EXTERNAL FUSE DESIGN:
An expulsion fusing system as used for protecting
capacitors consists of three components which include
the fuse tube / barrel, the fuse link, and the ejector
spring. The proper operation of a fuse is dependent upon
these components working in close harmony with each
other. The illustrations alongside show the fuse
assembly operation & visual indications of the fuse in
fused and blown fuse position.
Proper assembly of the fusing system is critical to the
successful operation of the fusing system whereas
incorrect installation may result in severe damage to
the fuses, the capacitors, and / or capacitor bank.
|
PARAMETER OF COMPARISON |
EXTERNAL FUSING |
INTERNAL
FUSING |
| Fuse isolates only
the failed / faulty element |
No |
Yes |
| Capacitor unit is
isolated on fuse operation |
Yes |
No |
| Reduction in Bank
output after fuse operation |
Considerable |
Negligible |
| Reduction in unit
life after fuse operation |
Unpredictable |
Marginal |
| Bank with cells of
higher kVAr Out-put |
No |
Yes |
| Reliability of Fuse
co-ordination / unbalance protection |
Unpredictable |
Very Reliable |
| Case rupture
protection |
Yes |
No |
| Economy in cost of
installation |
No |
Yes |
| Space requirement
for installation |
Occupy More Space |
Occupy Less Space |
| Visual indication
of fuse operation |
Yes |
No |
| Terminal to case
insulation protection |
Yes |
No |
| Consistency in fuse
operation I protection |
No |
Yes |
| Fuse is subject to
routine electrical testing along with the unit |
No |
Yes |
| Fuse is protected
from environmental hazards |
No |
Yes |
| Cost of structural
steel & weight |
Higher |
Lower |
| Convenience of
assembly and connections |
Cumbersome |
Convenient |
| External electrical
clearances |
Are Less |
Are More |
| Unit replacement in
case of failure |
Convenient |
Cumbersome |
Types of Mounting
Capacitor banks can be offered with option of units
mounted horizontally or vertically, performance
parameters remaining the same in either case. However
for space saving, compactness, and better clearances in
case of moderately sized or larger rated outdoor
installations, horizontal mounting is recommended.
Internal or external fusing can be offered for both
types of mounting options. |
ECOVAR Power Capacitors (For medium & high voltage
networks upto 145 kv)
