| General Information |
| Scope |
| DC capacitors up to 150 Kv DC, energy
up to 20 kilojoules, and inductance as
low as 40 nH manufactured using
biaxially oriented hazy propylene film
as dielectric, aluminum foil as electrode
and impregnated with Non-PCB as
impregnant. These capacitors are
designed for use in Energy Storage and
discharge applications.
• with dead casing, open terminal
(2 bushings).
• with live casing, open terminal
(1 bushing). |
Standards
IEC 61071-2007
BIS 13666:1993 (Indian Std.) Energy
Storage Capacitors.
Capacitors in accordance with other
standards / against specifications can
be manufactured upon request. |
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Categories
Energy Storage capacitors are classified
into different categories depending on
maximum peak current, repetition rate,
working temperature, storage
temperature, or inductance values. |
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Classification Based on Max. Peak
Current
Max. Peak Current 25 kA.
Max. Peak Current 50 kA.
Max. Peak Current 200 kA.
Max. Peak Current 500 kA. |
Classification Based on Repetition
Rate
Repetition Rate A. Up to 5 PPM
Repetition Rate B. Up to 1 PPS
Repetition Rate c. Up to 10 PPS
Repetition Rate D Up to 100 PPS
Repetition Rate E. Over 100 PPS.
Classification Based on Temperature
Category L 0 to 45o C ambient.
Category H 0 to 50o C ambient.
Classification Based on Storage
Temperature
Category L 1 0 to 70o C ambient.
Category H1 0 to 50o C ambient.
Classification Based on Inductance
value
Category 1 15 to 60 nH
Category 2 61 to 150 nH
Category 3 above 150 nH
(Low Inductance Capacitors can also be supplied against specific requests.) |
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Rating
Rated percentage voltage reversal
The preferred values of voltage
reversals are 20% to 800/0.
(Voltage reversals against specific
request can also be supplied.) |
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Overload
The max. Permissible overload current
shall be 1.1 times the rated peak
discharge current at rated percentage
voltage reversal and rated voltage.
Where ....
I (peak) = K x UR x (C/L) 0.5 and K is a
constant depending on percentage
voltage reversal. |
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Electrical Tests
• Test for capacitance
• Voltage test between terminals
• Voltage test between terminals and
container
• Measurement of dissipation factor
• Measurement of Equivalent Series
Impedance (ESL)
• Measurement of Equivalent Series
• Resistance (ESR)
• Capacitor Discharge test
• D C Life test
• Life Expectancy / Endurance test
• Insulation Resistance Test
1. Between terminals
2. Between terminals and the
container
• Sealing test
• Charge / Discharge cycle test |
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Quality Management System ISO 9001
Safety Regulations
When installing the equipment,
relevant IS recommendations shall be
observed.
Qualifications
EDF (HN 54-S-05), CSA.
Temperature range
Capacitors are designed for operation
between -40°C to +55OC |
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Manufacturing and Quality Control
Imported bi-axially oriented double
hazy Polypropylene film and 99.9%
pure aluminum foil are used as
dielectric and electrode. Wrinkle free
winding of the elements is carried in a
Class 100 environment on a Semi-
Automatic winding machine with
edge and end folding of the aluminum
foil.
This is to eliminate over voltage stress
at the edges of the buried area of the
foil.
Each wound element is tested for DC
Overvoltage with stand and adequacy
of margins between AI foils and pin
holes.
Numbers of elements are
interconnected in series - parallel to
achieve the desired capacitance and
designed voltage rating of the
Capacitor.
The dry pack is wrapped with several
layers of high quality insulating paper
before inserting it into a pretreated /
sheet metal container grade SS 409 L
and the top lid is welded by semi-
automatic Pulsed TIG welding
machine.
Specially designed F G molded
bushings of desired creepage distance
and mechanical strength are fitted on
the lid in such a way that termination
is done to achieve desired inductance
The capacitors are then processed in a
PLC controlled autoclave for drying
and under heat @ 85°C and vacuum of
0.001 torr for a given period. After
confirming the quality of drying by
precision online monitoring
instruments, the capacitors are then
impregnated under vacuum with
highly purified and degassed Jarylec
C-101.
The capacitors are then subjected to
all routine tests in accordance to
IS 13666:1993 |
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Painting
After completion of electrical tests,
the capacitors are then loaded on a
overhead conveyorised painting
system.
The capacitors are first subjected to
sand blasting which ensure removal of
welding burrs, minor scratches etc.
making the surface perfect compatible
for painting. Thermal spray is also done
against specific orders. The capacitors
are then painted in a painting booth
with semi-automatic painting gun
with two coats of epoxy primer
followed by two coats of epoxy air
drying paint. The paint layers are tested at random
for adhesion to the surface of the
capacitor.
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Mounting
Capacitors may be mounted vertically
or horizontally as required.
Life Expectancy
Based on the state of art plant & machinery, quality of raw materials
used, manufacturing under strict
quality control and process using
precision on line instruments, and
elevated over voltage test results
under extreme temperatures,
capacitors are assured of minimum
20 years life. |
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Note: Product improvement is a continuous process. For the latest information and special applications, please contact us .. |
