Power Capacitor

SELECT AS WELL AS PROFESSIONAL ENGINEERS^TM

With vast knowledge and experience available in RAYA, we are capable of working out a technically and economically viable power factor solution for each type of installation.

Design and Specifications

Product Ranges:

The banks are equipped with Sheet metal enclosure, HRC Fuse for capacitor steps with fuse failure induction, Vacuum Contactor or Sf6 Circuit Breaker, Inrush current limiting reactor (inductor), Power capacitor units of single/three phase with internal element fuses, Control box with power factor controller and indications.

Automatic power factor correction banks are suitable for plants and installations where load on the power system is fluctuating. In this type of bank, the total KVAR is divided in to a number of stepsequal or unequal, depending on load conditions. The capacitor steps are switched in out through a contactor, controlled by a power factor controller. If a discharge coil (Voltage Transformer) is connected along with the step, the discharge time of capacitors get reduced to 10 seconds (otherwise it is 10 minutes). This would enable rapid reconnection of steps.

Automatic power factor correction banks

Product Ranges:

Fixed Capacitor Banks are used for permanent connection to network. There is variety of fixed banks with different types of enclosure/mounting rack, and equipments included.

Fixed Capacitor Banks

Normally, this type banks connected in parallel are used for systems up to 12KV where KVAR requirement is not high. Three phase units are not available above 12 KV, hence for higher voltage rating ranting and KVAR requirements, double star connected capacitor bank with single phase units, is used. With this combination, we are able to achieve any voltage level and KVAR output, which would give a technically and economically viable capacitor bank design.

Bank with single phase units are assembled to form, two-star connected banks(star groups)side, and two neutrals are then joined together through a nutral C.T. to have a common ungrounded neutral. Defect, if any occurs, in any of the star group, the unbalance current in the neutral is detected by the C.T. to initiate an alarm or a trip, before greater damage could occur. The number of capacitor unit in the bank, depends on the power rating (KVAR) of bank and system voltage. The number of units are in multiples of 3, however there is minimum 6 Nos in any case.

Bank with 3 phase units is assembled with 3 phase units 1 to 4 Nos. connected in parallel. Units are 3 phase internally star connected and thus the bank in totally is in single star configuration. Practically components required is depending upon customer requirements and power system type. Normally it is connected to network where highest voltage is 12KV, and KVAR is 50 to 1600 KVAR for 6.6KV system and up to 2400 KVAR incase the system voltage is 11KV. We can offer more power at higher voltage because Max. current rating for fuse is 315A.

Fixed 3 phase single star VS Automatic 3 phase double star

Also depending upon the mode of connection, there are two types of banks. First is connected which is suitable for voltages up to 6.6KV and other is connected bank assembled with minimum 6 Nos of single phase units, which is preferable for voltage 11KV and above.

power system network for power factor correction. This is assembly is designed as capacitor bank. Capacitor banks are eighter type or and are complete with equipments for protection against malfunctioning when connected to power system network.

There are a series of accessories and components which are assembled with MV/HV capacitor units to form a composite equipment, which functions effectively, when connected to

Capacitor Banks with Single/Three Phase Units

Power Capacitor Banks are available up to 36KV with ordered KVAR on request.