Individual Capacitor Bank

Product Specifications

Technical details and manufacturing context for Individual Capacitor Bank

Definition

An individual capacitor bank is a self-contained electrical component that forms part of a larger capacitor bank array. It consists of multiple capacitors connected in series and/or parallel configurations, housed within a protective enclosure with necessary switching, protection, and monitoring devices. Within the array, each individual bank operates independently or in coordination with others to regulate power factor, improve voltage stability, and reduce energy losses in electrical distribution systems. The bank is designed for indoor or outdoor installation, with a degree of protection ranging from IP54 to IP65 depending on environmental requirements. It is available in rated voltages of 400–480 V AC, frequencies of 50–60 Hz, and reactive power ratings from 5 to 100 kvar. Capacitance tolerance is -5% to +10%, dissipation factor is ≤0.002, and insulation resistance is ≥1000 MΩ. Operating temperature ranges from -40°C to 85°C, with derating above 70°C, and humidity range is 0–95% RH (non-condensing). The dielectric material is metallized polypropylene film (MKP). Weight varies from 10 to 50 kg, and dimensions range from 300×500×200 mm to 600×800×400 mm (W×H×D). These values are reference ranges; actual specifications must be confirmed with the manufacturer for specific models. The bank complies with IEC 60871-1 for capacitors and IEC 60529 for enclosure protection. It is essential to verify model-specific parameters and standards with the legal manufacturer or supplier before procurement.

Working Principle

The individual capacitor bank stores electrical energy in an electrostatic field between its conductive plates separated by a dielectric material. When connected to an AC power system, it draws current that counteracts the lagging current from inductive loads, thereby improving the power factor. Each bank can be switched on or off independently based on system requirements to provide graduated reactive power compensation. The bank's internal configuration of series and parallel capacitors determines its effective capacitance and voltage rating. Switching operations must consider transient currents and voltages to avoid damage. Proper selection of rated voltage, frequency, and reactive power ensures compatibility with the system. Monitoring devices track parameters such as temperature and current to detect abnormal conditions. Regular inspection of insulation resistance and dissipation factor helps identify degradation. Failure modes include dielectric breakdown, short circuits, or open circuits, which may require bank replacement. The bank operates within specified temperature and humidity limits; exceeding these can reduce lifespan. Coordination with other banks in the array allows precise control of reactive power output.

Common Materials

Aluminum electrolytic capacitors, Polypropylene film capacitors, Steel enclosure, Copper busbars, Ceramic insulators

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	400–480 V AC	Must match system voltage; higher voltage increases cost.IEC 60871-1
Rated Frequency	50–60 Hz	Standard grid frequencies.IEC 60871-1
Rated Reactive Power	5–100 kvar	Total reactive power compensation capacity.IEC 60871-1
Capacitance Tolerance	-5–+10 %	Ensures balanced loading among units.IEC 60871-1
Dissipation Factor	≤0.002	Lower losses improve efficiency.IEC 60871-1
Insulation Resistance	≥1000 MΩ	Minimum between terminals and case.IEC 60871-1
Operating Temperature	-40–85 °C	Ambient range; derating above 70°C.IEC 60871-1
Humidity Range	0–95 % RH	Non-condensing.IEC 60871-1
Degree of Protection	IP54–IP65	Higher IP for outdoor or dusty environments.IEC 60529
Dielectric Material	MKP	Metallized polypropylene film.IEC 60871-1
Weight	10–50 kg	Depends on kvar rating and enclosure.
Dimensions (W×H×D)	300×500×200–600×800×400 mm	Varies with rating and enclosure.

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

Components / BOM

Capacitor Elements Part
Store electrical energy through electrostatic charge separation

Material: Aluminum/polypropylene/paper dielectric
Discharge Resistors Part
Safely discharge stored energy when bank is disconnected

Material: Ceramic/metal alloy
Protective Fuses Part
Isolate faulty capacitor elements to prevent cascade failure

Material: Silver/silver alloy
Switching Contactor
Connect/disconnect the bank from the power system

Material: Copper contacts, steel enclosure
Enclosure Part
Protect internal components from environmental factors

Material: Galvanized steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Capacitor Bank Array

View system integration details

Manufacturers of Individual Capacitor Bank

Manufacturer profiles associated with Individual Capacitor Bank.

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Frequently Asked Questions

What is the typical voltage range for an individual capacitor bank?

The rated voltage is typically 400–480 V AC, but it must match the system voltage. Higher voltage ratings increase cost. Always confirm the exact voltage requirement with the manufacturer.

How do I select the correct reactive power rating (kvar) for my system?

The required kvar depends on the reactive power demand of your inductive loads. You can calculate it from the power factor improvement needed. The bank is available in ratings from 5 to 100 kvar; choose one that meets your compensation needs.

What is the significance of the dissipation factor?

The dissipation factor indicates energy losses in the capacitor. A lower value (≤0.002) means higher efficiency. It is a key parameter for evaluating capacitor quality and performance.

Can the capacitor bank be used outdoors?

Yes, but the degree of protection (IP rating) must be suitable. The available range is IP54 to IP65. For outdoor or dusty environments, a higher IP rating is recommended. Verify the enclosure rating with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar (sealed units), altitude up to 5000m
other spec:	Humidity: 5-95% non-condensing, Vibration: 5-2000 Hz at 10g max, Dielectric withstand: 2.5-3.0 kV RMS
temperature:	-40°C to +85°C (operating), -55°C to +105°C (storage)

Product Specifications

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