Technical Specifications:
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Rated voltage: 3000 V DC
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Capacitance: 8 mF ±5% (metallized polypropylene film)
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Peak current: 1200 A (1 s)
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ESR: ≤3 mΩ @ 1 kHz
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Parasitic inductance: <15 nH (multilayer laminated busbar)
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Ripple: <2% at 30% bus fluctuation
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Cycle life: 500 charge/discharge per min
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Monitoring: Fiber-optic temperature sensor array
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Encapsulation: Blue epoxy, GL fire-class compliant
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Dimensions: 220×160×80 mm, ~2.5 kg (some revisions 18.5 kg with heatsink frame)
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Temp: –20 to +70 °C op, –40 to +85 °C storage
Features:
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Four-quadrant regen absorption
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Suppresses IGBT dv/dt spikes
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tanδ aging prediction capable in instrumented revisions
Working Principle:
Rectified MV bridge charges the film bank; during deceleration the bank absorbs regenerative current instead of overshooting the bus. Laminated busbar minimizes loop inductance, clamping voltage overshoot at IGBT turn-off.
Applications: Hot-strip rolling stands, azipod thrusters, mine hoists, MV VFD DC intermediate circuit.
Installation & Wiring:
Panel-mount with M12 busbar bolts (35 Nm); torque sequence cross-pattern; forced-air duct if ambient >55 °C; fiber link to drive control for thermal alarm.
Precautions:
Pre-charge through resistor before connecting to rectifier; never discharge with shorting bar without bleed resistor; replace whole bank if one cell tanδ drifts >0.5%; 3000 V DC is lethal—lockout/tagout mandatory.
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