Research on the structure and safety of transformer bushing tap adapter

Abstract

Tap adapter is necessary in online monitoring of transformer bushings to induct current connected to bushing tap. In this paper， earthing structures of transformer bushings in one provincial power grid are investigated. Problems including signal induct， waterproof and durability， open circuit protection， convenience of disassembly and assembly in preventive test and compatibility are handled. Aiming at 3 major earthing structures， 3 types of interface adapters are designed and the safety of transformer bushing tap adapter are studied. The results show that dust-proof， water-proof and vibration resistance performances of the tap adapter meet the national standards； when the bushing tap is open， open circuit protection device of the bushing tap adapter can operate reliably under power frequency and lightning impulse voltage.

Keywords

• transformer bushing
• tap adapter
• tap earthing structure
• reliability