ZGS11 Combined Transformer Series (American-Style Pad-Mounted Substation)

Overview

The ZGS11 combined transformer (American-style pad-mounted substation) brings the HV load-break switch, back-up fuses, transformer body and LV outgoing unit together in one fully sealed tank. It is small and compact and is used at load centres in urban networks, residential districts, hospitals, schools, airports and stations, reducing losses and improving supply quality.

Features

• Small size and a rational, compact structure.
• Fully sealed tank and fully insulated design for safe, reliable operation.
• High overload capability and excellent withstand against sudden short circuits.
• Suitable for both ring-main and radial (terminal) supply.
• Easy to operate, with reliable supply.
• Energy-efficient, with low losses.
• Good resistance to impulse stress.
• Cable connectors switch up to 200 A load current, with long mechanical and electrical life.

Technical specification

• Rated capacity: 100 to 1600 kVA.
• Rated voltage: 6 / 6.3 / 6.6 / 10 / 10.5 / 11 kV.
• Tapping range: ±5% or ±2×2.5%.
• Vector group: Dyn11.
• Power-frequency withstand voltage: 25 kV/1 min for the 6 kV class; 35 kV/1 min for the 10 kV class.
• Impulse voltage: BIL 60 kV for the 6 kV class; BIL 75 kV for the 10 kV class.
• Back-up fuse breaking capacity: 50 kA.
• Load-break switch: 300 A; short-time withstand current 12.5 kA for 2 s (ring main) and 16 kA for 1 s (terminal); peak withstand current 31.5 kA (ring main) and 40 kA (terminal).
• Ambient temperature: -20 °C to +40 °C; top-oil temperature below 85 °C.
• Noise level: 50 dB or less.