ABB ACA 4,2525,5 ΜF3 3BHB020695R0010

Product Brief Introduction

High-energy density metallized polypropylene film DC-link capacitor assembly engineered exclusively for ABB medium voltage variable frequency drive power converter units. Stabilizes DC bus voltage, suppresses power grid harmonic distortion, and buffers transient power surges during motor acceleration/deceleration cycles in heavy industrial medium voltage drive systems.
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Description

Technical Specifications

  • Rated Capacitance: 4,2525.5 μF per integrated capacitor bank assembly
  • Dielectric Type: Biaxially oriented metallized polypropylene film (BOPP)
  • Nominal DC Operating Voltage Rating: 1,800 VDC continuous rated voltage
  • Maximum DC Surge Voltage Tolerance: 2,100 VDC short-duration transient surge
  • Rated Operating Frequency Range: 0 Hz to 6 kHz power converter switching frequency
  • Ambient Operating Temperature Range: -20 °C to +70 °C drive cabinet internal environment
  • Internal Discharge Resistor Value: 100 kΩ integrated passive discharge resistor network
  • Overpressure Disconnect Safety Rating: Internal pressure-activated circuit breakaway safety device

Functional Features

  1. Integrated passive discharge resistor network to eliminate residual DC voltage post power shutdown
  2. Internal overpressure mechanical safety disconnect to prevent thermal runaway failure
  3. Low equivalent series resistance (ESR) design minimizing internal power heat generation
  4. Self-healing metallized film dielectric to recover from minor internal dielectric breakdown events
  5. Integrated thermal temperature sensor interface for drive system overheat monitoring logic

Performance Parameters

  • Equivalent Series Resistance (ESR) at 1 kHz: ≤ 0.8 mΩ full assembly
  • Maximum continuous ripple current rating: 120 A RMS at +40 °C ambient temperature
  • Capacitance tolerance rating: ±3% of nominal 4,2525.5 μF value
  • Self-healing breakdown recovery voltage threshold: 1,950 VDC
  • Rated service life: 100,000 operating hours at maximum ripple current and +70 °C ambient
  • Temperature coefficient of capacitance: -0.03% per °C temperature rise

Material Composition

  • Capacitor winding core: Aluminum metallized polypropylene film dielectric layers
  • Assembly housing: Aluminum alloy extruded sealed metal casing
  • Internal impregnation medium: Environmentally friendly biodegradable dielectric mineral oil
  • Terminal busbars: Tinned oxygen-free high conductivity copper (OFHC)
  • Pressure safety membrane: Stainless steel rupture disc with mechanical trip linkage
  • External insulation barrier: Silicone rubber high-temperature insulation sheets

Structural Characteristics

  • Rectangular sealed aluminum monolithic housing assembly
  • Dual heavy-duty copper busbar terminals for DC positive/negative bus connection
  • Side-mounted NTC temperature sensor port for drive control system thermal monitoring
  • Bottom integrated mounting flanges with pre-drilled bolt holes for cabinet frame fixation
  • Internal segmented capacitor winding banks to distribute thermal load evenly across assembly

Working Principle

During medium voltage drive converter operation, AC grid power rectifies to DC voltage across the capacitor assembly DC bus terminals. The capacitor bank stores electrical energy to maintain stable DC bus voltage during rapid motor load fluctuations and absorb high-frequency switching ripple current generated by IGBT power switching modules. Integrated discharge resistors slowly drain stored electrical energy once drive input power is disconnected to eliminate hazardous residual high DC voltage. Internal temperature sensors transmit real-time housing temperature data to drive control boards to trigger overheat fault protection. Excess internal gas pressure generated by dielectric degradation activates the internal rupture disc safety disconnect to isolate the capacitor bank from the DC bus circuit permanently.

Core Advantages

  1. Ultra-low ESR design drastically reduces internal heat buildup under high ripple current loading
  2. Self-healing metallized film dielectric extends operational lifespan under transient voltage stress
  3. Integrated discharge circuit eliminates separate external discharge resistor hardware requirements
  4. Mechanical overpressure safety disconnect mitigates fire risk during catastrophic dielectric failure
  5. Factory-calibrated capacitance tolerance compatible with ABB medium voltage drive power control algorithms

Applicable Industries

Heavy mining conveyor drive systems, cement plant medium voltage motor drives, metal rolling mill power converters, bulk port crane medium voltage variable speed drives, hydroelectric power plant auxiliary motor control systems, oil & gas pumping station MV drives

Installation Requirements

  1. Mount assembly horizontally only on drive cabinet steel support frames using M10 high-tensile steel bolts
  2. Torque copper busbar terminal connection bolts to specified 60 N·m uniform torque value
  3. Maintain minimum 150 mm unobstructed vertical airflow clearance above capacitor housing
  4. Connect NTC temperature sensor wiring directly to ABB drive control board monitoring terminals
  5. All busbar insulation barriers must be reinstalled fully post wiring completion

Usage Precautions

  1. Never contact busbar terminals within 30 minutes of drive power shutdown to allow full residual voltage discharge
  2. Immediate drive system shutdown mandatory if control logic triggers capacitor overtemperature fault code
  3. Prohibit operation above +70 °C ambient cabinet temperature to prevent accelerated dielectric aging
  4. Mechanical impact or deformation to aluminum housing disables internal pressure safety protection mechanism
  5. Do not bypass internal discharge resistor network via external wiring modifications
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