The LSY-10 three-phase integrated current transformer is a 10 kV indoor, epoxy resin cast, three-hole core-penetration unit integrating independent A/B/C phase CTs (with optional zero-sequence winding), suitable for 10 kV ring main units, gas-insulated switchgear, and pole-mounted switches. It is used for measuring three-phase currents, metering, and providing short-circuit and single-phase ground fault protection via zero-sequence current.
Main Parameters:
• Rated voltage: 10 kV (12/42/75 kV)
• Frequency: 50 Hz
• Primary current: 40–600 A (common ratios: 100/5, 200/5, 300/5, 400/5, 600/5)
• Secondary current: 5 A / 1 A
• Accuracy class: Metering 0.5/0.2S; Protection 10P10; Optional zero-sequence winding available (20/1 A)
• Rated output: 2.5/5/10 VA (cosφ = 0.8)
• Structure: Epoxy resin vacuum casting, flame-retardant housing, three independent core-penetration holes (one for each phase A/B/C)
