ABSTRACT
Protective relaying is applied to power system components to separate the faulted equipment from the rest of the system so that the system can continue to function, to limit damage to faulted equipment, to minimize the possibility of fire, and to ensure personnel safety. The shunt capacitor banks are built using individual units connected in a seriesparallel combination. Capacitor bank protection is provided against the following conditions [1-4]:
1. Overcurrent due to faults 2. Transient overvoltages 3. Overcurrents due to individual capacitor failure 4. Continuous capacitor unit overvoltage 5. Discharge of capacitor unit overvoltage 6. Inrush current during switching 7. Arc-over within the capacitor bank 8. Lightning
Table 15.1 identifies the types of faults in shunt capacitor banks and the protection methods. Capacitor overcurrent
protection, which is obtained through fuses, is outlined in Chapter 16. Overall fault protection is performed through the use of circuit breakers as discussed in Chapter 17. Surge protection, which is achieved through surge arresters, is presented in Chapter 18. Protective relaying arrangements are discussed in this chapter.
