Magnewin Energy Pvt. Ltd.
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Low Inductance Capacitors


Energy Storage Capacitors


DC Capacitors

Our Range of Products

Voltage divider up to 1200 KV.

• Low Voltage Shunt Capacitors
  All Film-Foil NPCB Impregnated Type

• Medium Voltage Surge Capacitors
   / Banks up to 145 KV.

• Medium & High Voltage Surge Capacitors
  up to 50 Kv.

• Medium Frequency Water Cooled
   Capacitors. Up to 7200 KVAr.

• Medium Frequency Water Cooled

• Energy Storage & Pulse Discharge    Capacitors. Up to 100 Kj

• Low Inductance Capacitors
   Up to 20 nH.
Low Inductance Capacitors
Low Inductance Capacitors

Low Inductance Capacitors

General Information
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).
IEC 61071-2007
BIS 13666:1993 (Indian Std.) Energy Storage Capacitors.
Capacitors in accordance with other standards / against specifications can be manufactured upon request.
Low Inductance Capacitors
Low Inductance Capacitors
Low Inductance Capacitors
Energy Storage capacitors are classified into different categories depending on maximum peak current, repetition rate, working temperature, storage temperature, or inductance values.
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.)

Rated percentage voltage reversal The preferred values of voltage reversals are 20% to 800/0. (Voltage reversals against specific request can also be supplied.)
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.
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
Quality Management System ISO 9001

Safety Regulations
When installing the equipment, relevant IS recommendations shall be observed.

EDF (HN 54-S-05), CSA.

Temperature range
Capacitors are designed for operation
between -40°C to +55OC
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


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.

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.

Note: Product improvement is a continuous process. For the latest information and special applications, please contact us ..
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