A 100 kVAr APFC panel is an automatic power factor correction panel with a nominal reactive-power compensation capacity of 100 kilovolt-amperes reactive. It switches capacitor steps in or out as electrical demand changes, helping a facility manage its power factor and reduce avoidable reactive-power flow. To select one correctly, first establish the load’s measured compensation requirement, then confirm system voltage, frequency, switching arrangement, harmonic conditions, and installation requirements. The 100 kVAr rating is a starting point—not a substitute for load data or an engineering review.
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This guide is intended for electrical contractors, panel builders, consultants, plant engineers, and procurement teams evaluating a 100 kVAr APFC panel. It is useful when preparing a new installation, replacing existing power-factor correction equipment, or comparing supplier quotations. It is not a substitute for a site-specific design, especially where nonlinear loads, frequent load changes, or unusual electrical conditions are present. The final selection should be checked against the facility’s electrical design requirements and applicable local rules.
Many AC loads, including motors and transformers, draw reactive power as part of their operation. Capacitor banks supply reactive power locally, which can reduce the reactive component drawn from the supply when correctly selected and controlled. An APFC controller monitors electrical conditions, commonly including power factor, and commands switching devices to connect or disconnect capacitor steps. This automatic operation is intended to keep compensation closer to changing demand than a permanently connected capacitor bank.
The 100 kVAr figure describes the panel’s nominal total compensation capacity under its specified operating conditions. It does not mean that the panel continuously supplies exactly 100 kVAr: the controller may use only some steps, and delivered capacitor output can vary with operating voltage and other design factors. A supplier should state the conditions and component ratings used for the quoted capacity. Confirm whether the rating refers to the complete assembled panel and how the steps are arranged.
Start by checking the system’s nominal voltage, frequency, phase arrangement, and available fault level against the proposed panel design. As an example of a rating that must be confirmed, an installation operating at 400 V and 50 Hz requires equipment specified for those conditions; do not assume that a panel configured for another voltage or frequency is interchangeable. The supplier should identify capacitor ratings, switching-device ratings, controller functions, and required protective devices in the quotation or technical datasheet.
Ask how the 100 kVAr total is divided into steps. A configuration with smaller increments can generally make finer adjustments to changing loads, while larger increments may be adequate for steadier demand; the appropriate arrangement depends on the load profile and control requirements. For instance, a panel might be specified with 10 steps of 10 kVAr, but this is only an illustrative configuration, not a universal recommendation. Request the actual step schedule and confirm how the controller responds at low load.
Before selecting standard capacitors, assess whether the facility has significant nonlinear loads, such as variable-speed drives, UPS systems, or other power-electronic equipment. Harmonic conditions may affect capacitor-bank suitability and can make a detuned design worth evaluating. A detuned panel typically includes series reactors selected as part of the system design; it should not be specified by assumption or by choosing a generic reactor value without engineering assessment. Share available harmonic measurements or load information with the panel supplier.
Also check the switching method, protection arrangement, enclosure, cable entry, ventilation, and intended installation location. The panel must fit the site’s environmental and maintenance requirements, and clearances and heat management should be considered during installation. Clarify whether the proposed solution is intended for frequent switching and whether the switching equipment is appropriate for the expected operating pattern. These details can affect suitability even when two quotations show the same nominal kVAr rating.
A 100 kVAr APFC panel may be considered in commercial or industrial facilities where the measured reactive-power requirement is in a suitable range and varies enough to benefit from automatic step control. Potential applications include workshops, production sites, pumping systems, and buildings with groups of inductive loads. These examples do not establish that 100 kVAr is appropriate for every facility in those categories. The actual decision depends on load demand, operating schedule, existing correction, and the electrical system configuration.
A common preliminary sizing method uses active power and the change from the present to the desired power factor. The approximate relationship is Qc = P × (tan φ₁ − tan φ₂), where Qc is the required compensation in kVAr, P is active power in kW, and φ₁ and φ₂ correspond to the initial and target power-factor angles. For illustration, a 100 kW load moving from a 0.80 power factor to a 0.95 power factor requires roughly 42 kVAr by this simplified calculation. This is an example for explaining the method, not a site-specific design result.
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Use actual operating data where possible, rather than relying only on equipment nameplate totals. Review load variation across operating shifts, seasonal conditions, and periods when production is stopped or reduced. Existing capacitors must be included in the assessment so the new panel does not duplicate compensation. A qualified engineer should verify the estimate, particularly where the supply has substantial harmonics or the measured power factor changes rapidly.
Provide the supplier with the nominal system voltage and frequency, the required total capacity, and the preferred or required power-factor target. Include available measurements of kW, kVAr, power factor, load variation, and harmonic distortion, along with details of existing correction equipment. State the installation location, enclosure expectations, cable-entry preference, and any project-specific drawings or control requirements. More complete inputs help suppliers assess the proposed design and identify information that still needs confirmation.
Compare quotations on equivalent technical scope, not just the headline capacity or price. Check the number and rating of steps, capacitor and switching-device specifications, controller functions, protection, enclosure, detuning provisions, and included documentation. Ask which items are included in the panel supply and which are excluded, such as installation, commissioning, or site measurements. Record any assumptions and deviations so that procurement and engineering teams can review them consistently.
The price of a 100 kVAr APFC panel depends on its electrical ratings, step arrangement, switching method, capacitor and protection selection, enclosure, and whether harmonic mitigation is required. Customization, documentation, inspection requirements, and delivery destination may also affect a quotation. Because these factors vary by project and supplier, request a project-specific offer rather than relying on a generic price range. Compare the stated scope and technical assumptions alongside the commercial terms.
Minimum order quantity and lead time are supplier- and configuration-dependent, and should be confirmed in writing for the requested design. Ask whether the quoted schedule begins after drawing approval, receipt of required technical information, or another agreed milestone. If the project has a delivery deadline, state it early and request confirmation of the applicable production and shipping assumptions. Do not treat an indicative schedule as a guaranteed delivery commitment.
Choose a supplier that can review the stated application and provide a clear technical configuration for the required capacity. Ask for a datasheet, step schedule, component information, drawings where applicable, and a list of project assumptions. Confirm how technical questions, design changes, inspection requests, and after-sales support are handled. These checks help buyers evaluate whether the offer is transparent and aligned with the project’s needs.
SINAVA supplies power quality products and can discuss 100 kVAr APFC panel requirements for transformer and industrial applications. Share your electrical system details, load profile, harmonic information, and project requirements so the proposed configuration can be assessed against the intended use. Where information is not yet available, identify the open points in the inquiry and ask what measurements or documents would support selection. Final ratings and configuration should be confirmed for the specific installation.
A 100 kVAr APFC panel is suitable only when its nominal capacity and design match the facility’s measured reactive-power demand, electrical ratings, load behavior, and harmonic conditions. Begin with site data, estimate the compensation requirement, and then compare step arrangements, protection, switching, enclosure, and any detuned option. Confirm that quotations clearly distinguish included equipment from services or work outside the supply scope. This approach answers the central selection question: choose 100 kVAr when verified project requirements support that capacity, not simply because it is a common rating.
To evaluate a panel for your project, prepare the system voltage and frequency, load and power-factor measurements, harmonic information if available, site conditions, and delivery requirements. Send these details to SINAVA for a technical and commercial discussion of the configuration, documentation, and support needed for your application.
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