QBANK is available with internally fused, externally fused or fuseless capacitor units.
Internally Fused Bank
Internally fused banks have internal fuses as the current-limiting action. One fuse is connected in series with each element within the capacitor. They are designed and coordinated to isolate internal faults at the element level and allow continued operation of the remaining elements of that capacitor unit. This results in a very small part of the capacitor being disconnected; therefore, the capacitor and the bank remain in service. The designs are customized per customer specifications and generally include racks, capacitors, insulators, switches, unbalance protection scheme, current limitingreactors and more.
Advantagesof Internally Fused Banks:
- Cost effective
- 50 years of experience
- Utilizes large kvar size units
- Few live parts exposed
- Reduced installation and maintenance time and cost
- Proven reliability in the field
Externally Fused Bank
These open-stack substation banks utilize an external fuse (expulsion or current limiting) as a means of unit protection. The designs are customized per customer specifications and generally include racks, capacitors, insulators, fuses, elevation structures, switches, unbalance protection scheme, current limiting reactors and more.
Advantages Externally Fused Bank:
- Visual indication of blown fuses
- 70 years of experience
- Utilizes small kvar size units
Fuseless Bank
These open-stack substation banks utilize an unbalance protection scheme as the primary means of protection. As the name implies, there are no internal or external fuses on this design. The "string" configuration provides a very reliable and cost effective design for banks rated 35 kV and above.
Advantages Fuseless Bank:
- Cost effective
- Compact size
- Utilizes large kvar size units
- Few live parts exposed
- Reduced installation and maintenance time and cost
- Proven reliability in the field