Internal and external fuses in power capacitor units differ in where the fuse is located and how they protect the bank from faults.
|
Features |
Internal fuses |
External fuse |
|
Where（Location） |
Inside the capacitor, connect to each capacitor elements |
Outside of the capacitor, connect with the overall capacitor bank |
|
Object of Protection |
single capacitor elements |
overall capacitor |
|
Action consequences |
cut-off the fault capacitor element, the overall capacitor bank continues to operate |
cut-off the overall capacitor, the whole power capacitor bank out of operation |
|
Application |
large capacitor bank, high voltage shunt capacitor bank |
backup protection for internal fuse, or medium voltage system. |
In general, fuse is a protective design that sacrifices the individual for the greater good the entire capacitor bank. It greatly enhance the operational reliability and service life of power capacitors by cut-off the individual faulty capacitor elements/capacitor bank, preventing the expansion of overall capacitor bank faults (such as explosion,fire etc.)
