INDUSTRY COMPONENT

Capacitor Units

Capacitor units are passive electrical components that store and release electrical energy in power capacitor banks for industrial applications.

Component Specifications

Definition
Capacitor units are fundamental components within power capacitor banks, designed to store electrical energy in an electrostatic field between conductive plates separated by a dielectric material. They are engineered to provide reactive power compensation, power factor correction, voltage stabilization, and harmonic filtering in industrial electrical systems. These units operate by accumulating charge when connected to a power source and releasing it when required, helping to improve energy efficiency and system reliability.
Working Principle
Capacitor units function based on the principle of capacitance, where electrical energy is stored in an electrostatic field created between two conductive plates (electrodes) separated by a dielectric insulator. When voltage is applied, positive and negative charges accumulate on the respective plates, creating an electric field. The stored energy is proportional to the capacitance value (measured in farads) and the square of the applied voltage. In AC systems, they continuously charge and discharge, providing reactive power to offset inductive loads.
Materials
Electrodes: Aluminum or metallized polypropylene film; Dielectric: Polypropylene film, paper impregnated with dielectric fluid, or ceramic; Encapsulation: Epoxy resin, polyurethane, or metal casing; Terminals: Copper or aluminum with tin or silver plating; Internal connections: Aluminum or copper foil; Insulation: Polyester film or paper.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Lifetime100,000 hours at rated conditions
Frequency50 Hz or 60 Hz
Tolerance±5% to ±10%
Capacitance1 μF to 1000 μF
Rated Voltage230 V to 15 kV
Temperature Range-40°C to +85°C
Dissipation Factor<0.001

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
IEC 60831, UL 810, DIN EN 60831

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Dielectric breakdown from overvoltage
  • Thermal runaway due to excessive current or poor cooling
  • Short circuits from internal faults
  • Fire hazard if failed catastrophically
  • Environmental contamination from dielectric fluids
FMEA Triads
Trigger: Overvoltage exceeding rated limits
Failure: Dielectric breakdown leading to short circuit
Mitigation: Install overvoltage protection devices (e.g., surge arresters), use units with higher voltage ratings, and implement voltage monitoring systems.
Trigger: Inadequate cooling or high ambient temperature
Failure: Thermal runaway causing overheating and potential fire
Mitigation: Ensure proper ventilation, use cooling fans or heat sinks, monitor temperature with sensors, and select units rated for the operating environment.
Trigger: Harmonic distortion in the power supply
Failure: Premature aging and reduced lifespan due to excessive stress
Mitigation: Install harmonic filters, use capacitors designed for harmonic-rich environments, and conduct regular power quality analysis.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Capacitance tolerance within ±5% to ±10% as per IEC 60831; voltage tolerance must not exceed 110% of rated voltage continuously.
Test Method
Testing includes capacitance measurement using LCR meters, dielectric withstand test (high-pot test) per IEC 60831, dissipation factor measurement, and thermal cycling tests to ensure reliability under operational conditions.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Capacitor Units

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

ZHIYUE GROUP CO. LTD
Zhejiang, CN
Founded 19916800 square meters
ISO9001 CCC CE TSE
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What is the primary function of a capacitor unit in a power capacitor bank?

The primary function is to store and release electrical energy to provide reactive power compensation, which improves power factor, reduces energy losses, and stabilizes voltage in industrial electrical systems.

How do capacitor units differ from batteries?

Capacitor units store energy electrostatically in an electric field and can charge/discharge rapidly, while batteries store energy chemically and provide longer-term energy storage but with slower charge/discharge cycles.

What are common failure modes of capacitor units?

Common failures include dielectric breakdown due to overvoltage, thermal runaway from excessive heat, electrolyte drying in wet types, and terminal corrosion, often mitigated through proper sizing, cooling, and protective circuits.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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