The primary weakness of the shunt capacitor units is that their reactive power generation is relative to the square of the voltage, and accordingly when the voltage is low and the electrical system needs them most, they are delivering the least amount of the reactive power. The capacitor unit is the essential element of a shunt capacitor bank.
The guide covers applications that range from simple capacitor unit utilization to complex capacitor bank situations. Scope: This guide applies to the use of 50 Hz and 60 Hz shunt power capacitors rated 2400 Vac and above, and assemblies of such capacitors.
Scope: This guide applies to the use of 50 Hz and 60 Hz shunt power capacitors rated 2400 Vac and above, and assemblies of such capacitors. Included are guidelines for the application, protection, and ratings of equipment for the improved safety and reliability in the utilization of shunt power capacitors.
The shunt capacitor element can be made for a comparatively high voltage since the external fuse can clear a high-voltage fault. Application of capacitor elements with the greatest possible voltage rating will lead to shunt capacitive unit with the lowest number of series groups.
If the shunt capacitor bank is balanced and the system voltage is balanced, the neutral voltage will be zero. A variation in any phase of the shunt capacitor bank will lead to neutral or zero sequence voltage.
The protection of shunt capacitor bank includes: a) protection against internal bank faults and faults that occur inside the capacitor unit; and, b) protection of the bank against system disturbances. Section 2 of the paper describes the capacitor unit and how they are connected for different bank configurations.