Epcos Square Cap PFC Capacitors
While the electrical energy is getting more scarce and expensive in the developing countries, the need for power factor improvement by installing capacitors is well understood by the users.
The improved power factor means:
• Reduced line losses
• Improved voltage profile
• Reduced system current
• Reduced cable sizes
• Optimum usage of transformer
• Monetary saving.
We are pleased to offer an all New SquareCap Series of Power Factor Correction Capacitors with enhanced performance. It helps you to achieve better economy by selecting an application specific capacitor type.
The SquareCap Capacitor series is now available in three designs viz.
ENDC : EPCOS Normal Duty Capacitor for normal inductive linear loads.
EHDLL : EPCOS Heavy Duty Long Life Capacitor for loads exhibiting some amount of non-linearity, presence of harmonics, medium size industries.
ESHDC: EPCOS Super Heavy Duty Capacitor for non-linear arduous and fluctuating loads and systems containing higher degree of harmonics.
SquareCap PFC Capacitors are ISI approved and comply with IS 13340 and latest IEC specifications.
Basic Construction of the Capacitor
1.Film
The three layer Metalized (Silver-Zinc -Alluminium) Polypropylene Film (MPP) with heavy edge is manufactured in-house on the latest technology machines. This gives advantages of higher stability obtained from Zinc and longer shelf life obtained from Alluminium. Heavy edge construction of the film provides a better bonding between electrode and metal endspray (scooping), thereby enabling an increase in current carrying capacity and ensuring better withstanding to the electro-mechanical stress that occurs due to switching surges
2. Winding
The basic single phase capacitors are wound on computer controlled automatic winding machines and impregenated with polyurethane resin (dry technology). Thus ionisation and carona discharge are eliminated resulting in capacitors with highly stable characteristics and long life.
3. Safety Systems
A) Burst proof safety device -To prevent the capacitor from bursting in case of permanent breakdown caused by very high voltage in repetitive peaks and which can not be "self - healed" by the selfregenerative property, the capacitor is provided with a safety switchingdevice, which disconnects the capacitor from the power source. When the internal pressure increases to an unsafe level it produces expansion of the bellow and snapping of the inner connection to the supply terminal, thereby cutting off the supply and avoiding possible bursting. (See Fig. A)
B) Self-healing property - if the dielectric breakdown strength is exceeded locally at weak points, at pores or impurities in the dielectric, a dielectric breakdown occurs. The energy released by the arc discharge in the breakdown channel is sufficient to totally evaporated the thin metal coating in the vicinity of the channel. The rapid expansion of the plasma in the breakdown channel causes it to cool within few microseconds, thus quenching the discharge. This results in formation of insulated region around the faulty area thus the capacitor regains its full operation ability.
C) Due to polyurethane resin filling and non use of oil or PCB there is no risk of fire caused by spurting or leaking oil. In ecologically sensitive applications this design (dry) is a must.
4. Modular Construction
Single units in excess of 6KVAr are made up of the required number of basic single phase modules. These are housed in a single metallic container and are connected to the three terminals which are brought out through the terminal block. This construction enables easy and inexpensive repair at site and also considerably saves on spares inventory cost.
5. Inductor coil
For rating of 6KVAr and above each single phase capacitor module is provided with an inductor coil to control the inrush current to the capacitor, particularly in case of parallel switching and automatic control applications. This feature ensures long-term stability of KVAr output and extended life.
6. Discharge Resistor
All capacitors are provided with discharge resistors in order to discharge the capacitor to voltage less than 50Volts within one minute of disconnecting the supply. However, all capacitor terminals must be properly discharged before handling them.
EPCOS Super Heavy Duty Capacitor (Double Dielectric Type)
These capacitors meet the demands of heavy duty industrial loads. These loads are of the type, rectifiers, arc or induction furnaces, large rolling mills, cement factories, textile spinning mills, welding divisions etc. The basic reason which makes these loads arduous in nature is that, each load gives rise to high over current or higher over voltage in an irregular manner. Rectifier load or arc furnace generates harmonic voltages which would impose continuous and severe over current on capacitors.
In order to build up the correct degree of protection, a capacitor needs to be given a higher over current and also higher surge voltage withstand capacity. This dual consideration has been taken into account to evolve a different construction of capacitors. This design of the capacitors has been evolved keeping in mind the basic simplicity of construction of primary MPP cell and its superiority in the capital and operating costs. The new design retains all these features and still raises by about a factor of two, over current as also the surge voltage withstand capacity making it a real Super Heavy Duty Capacitor.
Unit ratings are available from 1 to 50KVAr.
Phase Cap Capacitor Phase Cap Capacitor
A hi-tech capacitor with Stud Mounting Cylindrical construction with inert gas impregnated winding having very good KVAr to volume ratio.
Specification :
• Conformance to Standards IEC 831-1/96, IEC 831-2/95, and VDE 560-46 3/95.
Range:
• Phase Cap : Single units from 5 to 60 KVAr. . Voltage: 230v to 690v.
• Wind Cap : for critical applications like windmill. Available in single units from 5 to 36 KVAr.
• Voltage: 690v and 800v.
Features:
• Manufactured using patented wave cut technology multilayer MPP film with Heavy Edge.
• Self healing property.
• Low energy consumption.
• Capable of withstanding high inrush current.
• Dry type - freedom from oil leakage.
• Explosion proof feature using pressure sensitive mechanical interrupter.
• Compact size arid light weight.
PhiCap Capacitor
Stud mounting cylindrical type Having very good KVAr to volume ratio.
Specification :
• Conformance to Standards IEC 60831-1 and 2/96, IS 13340.
Range :
• Single units up to 25 KVAr.
• Voltage : 220v to 525v.
Available in two designs:
• Normal Duty for linear inductive loads.
• Heavy Duty for non linear load (Up to 15 KVAr).
Features:
• Manufactured using multi-layer MPP film with Heavy Edge.
• Self healing property.
• Low energy consumption.
• Dry type-freedom from oil leakage.
• Explosion proof feature using pressure sensitive mechanical Interrupter.
Square Cap Capacitor Square Cap Capacitor
Rectangular box type. Self standing units. Modular construction with sheet metal enclosure.
Specification :
• Conformance to Standards
• IEC 831-1 and 2, IS 13340.
Range:
• Single unit from 1 to 50 KVAr.
Available in three designs:
• ENDC: EPCOS Normal Duty Capacitor for normal inductive linear loads.
• EHDLL: EPCOS Heavy Duty Long Life Capacitor for loads exhibiting some amount of non-linearity, presence of harmonics, medium size industries.
• ESHDC: EPCOS Super Heavy Duty Capacitor for non-linear arduous and fluctuating loads with higher degree of harmonics.
Features:
• Manufactured using multi layer MPP film with Heavy Edge.
• Self healing property.
• Low energy consumption.
• Dry type-freedom from oil leakage.
• Explosion proof feature for individual cell using pressure sensitive mechanical interrupter.
• Simplified modular construction using hermitically sealed single phase basic capacitor cells.
• Easy and quick reparability at site.
• Inductor coil per cell for 6 KVAr and above to dampen inrush current.