Rockwill shield machine box-type prefabricated substations are specialized power distribution units designed for shield tunneling machine applications. The internal structure is compact with a long and narrow layout that integrates high-voltage switchgear, transformers, and low-voltage distribution equipment into a single enclosure tailored to the spatial constraints of shield machine operations. The unit offers a protection grade of IP55, meeting the demanding requirements of harsh underground environments.
Key Features
Compact Form Factor ： Long and narrow enclosure design fits the structural layout of shield tunneling machines, optimizing space utilization within the tunnel cross-section.
Underground-Grade Protection： IP55 enclosure protection ensures reliable operation in harsh underground conditions with high dust concentration and moisture exposure.
Comprehensive Protection Functions ：Integrated detection and protection systems including overcurrent, earth fault, short-circuit, and temperature monitoring ensure safe and stable operation.
Customizable Configuration：Design and ratings can be tailored to match the electrical characteristics and spatial requirements of different shield machine types and tunneling projects.
Technical Parameters
Parameter
Value
Rated voltage (HV)
40.5 kV
Rated frequency
50 / 60 Hz
Rated normal current (HV)
630 A
Rated short-time withstand current (Ith)
25 kA / 3 s
Rated peak withstand current (Idyn)
63 kA
Low voltage side rated voltage
400 / 480 V
Transformer rated capacity
Up to 3000 kVA
Power frequency withstand voltage (PF)
95 kV
Lightning impulse withstand voltage (LI)
200 kV
Enclosure protection grade
IP55
Environmental Conditions
Parameter
Value
Environment
Underground tunnels with high dust and moisture
Installation
Skid-mounted, integrated with shield machine trailing gear
Main Categories: Medium and High Voltage Switchgear/Power and Distribution Transformers/Instrument Transformers and Sensors/Lightning Protection and Electrical Insulation/Substations and E-Houses/Electrical Panel and Controlgear
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