CAPACITORS
Low Voltage Capacitors
LT –All-PP Capacitor unit: Capacitor units are manufactured in the range of 5KVAr to 200KVAr in the voltage range of 110 V to 1000Volts. Capacitor banks (220 Volts to 440V / 1000V) are formed by series parallel combination of these units connected in various formations depending upon customer’s requirement / applications and applicable protection schemes. Bare capacitor units are used inside the automatic PF correction panels. Capacitors are type tested as per IEC / ISS (IS-13585/1994) in CRPI /ERDA Laboratory
Photograph Of Bank
LT Bank: Typical arrangement shown for LT capacitor bank is floor mounting type cubicle arrangement with IP-42 protection class completely enclosed used in chemical industries / paper industries. This design offer complete enclosure for all the live parts like, terminals, bus bar, cable termination chamber.
LV Capacitor Bank with SFU and Ammeter
LT Bank in cubicle with switchgears: Typical arrangement for LT banks supplied to BEST Bombay. These are small LT Capacitor panel shaped arrangement are fitted with switching device along with LT capacitors. There is provision for current monitoring by ampere meter provided on the panel. Back-up protection can be provided by external HRC fuses A/W switch unit.
Product Range
LT All-PP Capacitor unit: Capacitor units are manufactured in the range of 5KVAr to 200KVAr in the voltage range of 110 V to 1000Volts. Capacitor banks 230 to 1000 Volts are formed by series parallel combination of these units connected in various formations depending upon customer’s requirement / applications and applicable protection schemes. Bare capacitor units are used inside the automatic PF correction panels. Capacitors are type tested as per IEC / ISS (IS-13585/1994) in CPRI /ERDA labs.
| Parameter | Parameter | ||
|---|---|---|---|
| Power | 2.0 to 200 KVAr | Case shape | Steel / Reactangular |
| Rated Voltage-Un | 230 to 1000 Volts AC | Terminal | Stud terminal with Steatite bushings |
| Frequency | 50/60 Hz | Mounting & grounding | Self standing with mounting bracket |
| Intush Current | I - 300 times Raed Current | Enclosure | IP41, optionally IP54 |
| Temperature category | -40 to +650C | No. of switching operations per annum | 7500 Nos |
| Losses: Dielectric in W/KVAr Total in W/KVAr |
>0.2 >0.5 |
ISI Marking (440V) | Yes |
| Max. Humidity | 95% | Test Voltage | 2.15 x Un |
| Safety | Internal High Rupturing Capacity HRC Fuses | Hidden Losses | Nil ++ |
| Impregnation | Non PCB Oil* | Type Testing | CPRI / ERDA / UCL |
| Useful life | 1,50,000 hours | Type Testing | CPRI / ERDA / UCL |
| Cooling | Natural |
* Non PCB Oil Provides Better Cooling.
** All PP capacitor does not require inrush suppression coils which are used in MPP design capacitors. Coils contribute heavy power losses (2 to 4 Watts / Kvar) in MPP Capacitors
Applications
- PF Corrections
- Automatic PF Control Systems
- Motor Compensation
- Tuned Filters & De-Tuned Filters
- Uninterruptible Power Supplies (UPS)
- Wind Mills
- Rolling Mills
- Furnace Duty
- AC Power Electronics
Special Features of SLDT (Single Layer Double Thick) Design over Double layer APP design
- Electrical strength:
38% higher than mixed dielectric. 71% higher than 2 thin layer All PP design / double dielectric heavy duty, designs. - Dielectric losses (heat generation): 60% lower than mixed dielectric.
- Pin holes in polypropylene 25% less than mixed dielectric having 8-micron film, used in mixed dielectric. 66% less than 6 micron PP used in 2 layer all PP design / double dielectric design. In case of rare fault in 11.9 micron PP direct short element gets eliminated in factory testing at manufacturers works, whereas in mixed dielectric & 2-layer design even with one layer having fault capacitor work for few days only.
Life tested for 1000 hours at 1.2 times rated voltage & at 50 Degree C ambient.
LV Capacitors are manufactured in same machines, which are used, for HV capacitors and hence very high standards of process are maintained for all capacitors of LV range.
More than Two Million-KVAr capacitors with SLDT, All PP dielectric design are in operation in India and abroad.
Design / Technology
Universal Cables Ltd (UCL) entered into manufacturing of capacitors in the year 1967 under the technical collaboration with “Toshiba” of Japan. In the year 1977 we initiated Mixed dielectric (MD) technology capacitors in India with the General Electric of USA. As a continuous development process, we come up with the revolutionary technology of All-PP Capacitors with another technological tie-up with GE-USA in the year 1985.
For the continuous up-gradation in manufacturing process, UCL has one of the most modern plant in the Country. Cleanliness in our winding section is maintained as per US federal standards. Dust particles of 0.5 micron and above are limited to 100 particles on the winding machine and 1000 particle level in the room.
UCL is one of the few companies having its own R & D department to experiment with new raw materials and processes. Through R & D UCL were the first to develop successful technology of single layer double thick All-PP Capacitor in LT range.
- Plant fully equipped with raw material and process testing laboratory.
- Capacitor elements winding through fully automatic /computerized machines in ultra clean and humidity controlled conditions as per international standards.
Capacitors are type tested as per IEC / ISS (IS-13925) in CRPI Laboratory at Bangalore (NABL accredited, laboratory of Govt of India)