Application

JD6—Ⅲ phase and amplitude discrimination residual current-operated protective device (hereinafter referred to as protective device) combines with the low voltage circuit breaker or AC contactor to form the residual current operated protective device, it is used to protect the circuit against the earthing fault, prevent the equipment accident or electric fire for the earthing fault current, provide the indirect contact protection against the human electric shock, suitable for the safe operation of power grid.

JD6—Ⅲ protective device is our newly developed product, designed with the SCM control technology. It has functions like inverse time lag and primary reclosing functions as well as ideal time-delay characteristics, providing two gears of breaking time: 0.5s and 0.3s for user's selection. It is suitable for complex rural power grid and changeable climatic environment, with high rate of putting into use, especially, it is used for the primary general protection or secondary general protection of multi-class protection of powe grid. The product has conformed to the requirements of breaking time class difference stipulated as DL/ T4992001 Rural low-voltage Electric Power Technical Code.

Function characteristic

ThebreakingtimeisclassifiedastypeS,hastwoadjustablegears:0.5sand0.3s.Inthebreakingtimeof2I△ and5I△n,itpresentstheinversetimelagcharacteristics. Manyconnectionclassmaybeset(seemode),mainswitchesof connected,andthetransformersaregenerallyaccepted

ExcepttheconnectionclassDoruser'sspecialrequirement,thetrialpowersupplyisperformedonceafte startuporshutdownheprotectiondeviceeclusesautomaticallyafteropening2030sandhenputsntouse;he protectivedevice ,itislockedbyitself

Thefixedgearofresidualcurrentoperationvalueisadjustable,usercanselecttheproperoperationvalueaccordin tothecircuitorweatherconditions.Thesurfacehasthendicationofotalesidualcurrentvectorvalueofcircuit

ThestandardtypeprotectivedevicecanmakeACcontactorworkwithoutnoiseandsavetheenergy,thecontacto coilsof220Vand380Varegenerallyaccepted,itisveryconvenienttoconnect, the service life of contactor coil maybe prolonged. Due to the energy-saving efficiency, the investments for electricity expense of 1-2 years may be recovered.