With the extensive use of the assembled capacitors

the fault of them increases gradually.In view of protective action example of the capacitor

it is found that insufficient differential protection sensitivity is existed in the capacitor throughout detailed analysis from such three aspects as inspection of primary equipment

setting calculation and differential voltage calculation.Finally

such measures as modifying protectionmode

improving the protection setting margin and reducing protection mal-operation are taken so to reduce the fault of the capacitor due to insufficient differential voltage protection sensitivity.