Design of a Digital Protective Relay of SF6 Density with Leakage Alarm Function
The insulation and arc quenching properties of SF6 gas depend on its density.SF6 leakage brings about not only decrease of SF6 gas density but also other hazards.At present,SF6 gas density detection mainly relies on mechanical re-lays which have many shortco mings,such as inaccurate reading,untimely alarm and so on.min In view of these shortco mings,this paper designs a digital relay of SF6 density capable of achieving on-line monitoring of SF6 gas density.The SF6 leakage min deter mination algorithm is proposed,which can realize SF6 leakage alarm function and facilitate avoiding grid accidents due to untimely discovery of SF6 leakage.
SF6 leakagedigital relay of densityleakage min deter mination