Tackling Underground Core Processes: Taiyuan Heavy TZ390ET Powers a Southwest Hy

November 07,2026

Underground cavern construction has always faced a practical contradiction: cable-powered long-hour operation saves money, but a tens-of-meters short repositioning means disconnecting and reconnecting couplings, reeling cables and moving the distribution box—time and labor consuming; fuel machines are flexible but cannot cope with cavern exhaust, and long-term fuel cost stays high.

At an underground cavern site of a large Southwest hydropower project, this problem found a pragmatic solution. Upgraded to user needs, the Taiyuan Heavy TZ390ET cable-powered excavator adds a battery power module on top of its original cable drive, letting one machine deliver both 'lower cost on long-hour operation' and 'flexible short-distance mobility', earning high recognition on site.

With cable mode as the core operating form and a 109 kWh battery module as scenario supplement, it precisely solves the high-frequency pain points of cable machines—no redundant design, only answers to real front-line needs:

Effortless short repositioning: switching work faces in the same area or shifting stations runs on battery power autonomously; a full charge supports 1–2 km of travel with no need to dismantle the power line, smoothing the process handover.

No cabling for sporadic work: short jobs like edge trimming or temporary muck removal need no temporary cable, so the machine moves in to fill gaps anytime, saving cabling labor and material cost.

Backup for emergencies: on sudden power outage or line maintenance, the battery can support a safe shift or finish the job, avoiding schedule delays.

Engineered for the hydropower underground environment, the machine itself is specially adapted to be a 'mainstay' that can take root in the cavern for the long haul:

Zero emissions underground: pure-electric drive with no exhaust lowers the cavern ventilation load, improves the in-tunnel working environment, and meets green-construction controls.

Stable output on long shifts: under continuous supply the power stays steady with no drop-off, enabling high-intensity, reliable work even under heavy loads.

High fit for narrow sections: the body and controls are optimized for cavern scenarios, turning and maneuvering flexibly in tight spaces while handling both large earthwork and fine rock-face trimming without frequent machine changes.

Plateau underground environments are damp and dusty with complex movement lines, so reliability and safety are the baseline. The whole-machine motor and high-voltage supply system are fitted with full insulation protection and leakage cut-off safeguards for the special in-cavern environment; key structures are reinforced to endure long, high-intensity work and reduce downtime for maintenance.

This successful hydropower application is another proof of Taiyuan Heavy upgrading products around user scenarios and needs. Rooted in front-line construction and optimizing against real user pain points, Taiyuan Heavy will keep deepening its presence across more construction scenarios and fields, delivering solutions with stronger fit and better cost performance for key projects.

Source : www.51cm.org

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