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——Case 03 / 07 · Power Plants & Substations
100 MW CFB unit with 6 kV withdrawable switchgear.
Huadian’s Neijiang Gaoba power plant — a 100 MW circulating fluidized bed demonstration unit on the Tuojiang riverside — fitted with 6 kV vacuum-breaker switchgear in withdrawable cabinets and full DCS integration.
A CFB demonstration unit on the Tuojiang riverside.
The Neijiang Gaoba power plant is operated by Huadian Sichuan Power Generation and sits in Lexian Town, Shizhong District, Neijiang, on the banks of the Tuojiang River. It traces its lineage to the original Neijiang General Power Plant, formed in 1993 by the merger of the Baima Power Plant and the Neijiang Electric Manufacturing and Repair Plant.
The site’s core asset is Gaoba unit 11 — a 100 MW coal-fired generating set owned in full by China Huadian Group. The unit uses circulating fluidized bed (CFB) combustion technology, which imposes its own startup, shutdown and transient load profiles on the connected medium-voltage switchgear. The MV switchgear delivered for this project is designed around those specific duties, at the 6 kV level, using vacuum breakers in withdrawable hand-truck cabinets with full DCS integration and complete protection schemes.
What this project demanded.
CFB thermal duty and a generation-critical profile drove the MV switchgear specification.
CFB (circulating fluidized bed) thermal duty
6 kV medium-voltage switchgear
Vacuum breakers in withdrawable cabinets
Full DCS control integration
Five-prevention safety interlocks
Demonstration-grade reliability
What was delivered.
CFB-tuned withdrawable switchgear, matched protection scheme and full distributed control integration.
01
SWITCHGEAR6 kV Withdrawable Switchgear
Vacuum breakers are mounted in withdrawable hand-truck cabinets at the 6 kV level, designed for the thermal and transient duty profile of a circulating fluidized bed unit. Drawout construction allows breakers to be isolated, inspected and replaced without de-energising the entire switchboard.
02
PROTECTIONCFB-Tuned Protection Scheme
Protection relay settings and coordination curves are matched to the CFB unit’s startup, shutdown and load-transient profiles, so that protective trips during normal operating transitions are eliminated while genuine faults are cleared without delay.
03
DCS
DCS Integration
The switchgear is fully integrated with the plant’s distributed control system, allowing routine operation, metering, breaker state and alarms to be monitored and controlled from the central control room without manual intervention on the switchboard.
On-site photographs.
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