Indoor HV SF6 Ring Main Unit

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Feature: A. It consists of switch compartment, fuse compartment, operating mechanism compartment and cable compartment(bottom frame). B. The switch compartment consists of function circuit (including earthing switch and load switch) and busbar among the circuits. C. The load switch adopts air blast structure, which enhances the arc extinction capacity, but won't affect the insulation of phase to phase and phase to earth. Besides both of moving contact and static contact have arc contacts, which increase the breaking times. D. Both of fuse switch and load switch compartment consist of the protection circuit of transformer. The HV current limiting fuse is fitted in the epoxy casting insulating closure. When the fuse melts, then firing pin will bounces out, next the load switch opens. E. Operating mechanism compartment is on the right side of the RMU. Item Uint Parameter Rated voltage KV 40.5 Lightning impulse withstand voltage(peak value) Phase to earth & phase to phase KV 185 Isolating distance KV 215 1min Power frequency withstand voltage Phase to earth, phase to phase KV 95 Isolating distance KV 118 Load switch Rated current A 630 Rated short time withstand current (2s) KA 20 Rated short time withstand current(peak value) KA 50 Rated short circuit making current (peak value) KA 50 Mechanical endurance Times 5000 Busbar side of earthing switch Rated short time withstand current(2s) KA 20 Rated peak withstand current(peak value) KA 50 Rated short circuit making current (peak value) KA 50 Mechanical endurance Times 2000 Earthing circuit Rated short time withstand current(2s) KA 17.4 Rated peak withstand current(value) KA 43.5 Fuse Rated current A 50 Rated short circuit breaking current KA 31.5 Protection degree Main circuit (load switch, earthing switch) IP5X Fuse, cable connecting piece IP4X Fuse compartment, mechanism compartment

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Ningbo Tianan (Group) Co.,Ltd

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