Power Factor Perfection: How a Glass Plant Hit 0.999 PF at 11kV with Static Reactive Compensation

Introduction: When 0.987 Just Isn’t Good Enough

In industrial power management, the difference between a power factor of 0.987 and 0.999 might look small on paper — but on a monthly electricity bill, that gap can translate into real money, real penalties, and real inefficiency. This case study, presented by Envolta Systems Pvt. Ltd. and certified under the Schneider Electric EcoXpert Power Management programme, tells the story of a glass manufacturing facility in Vadodara, Gujarat that refused to settle for “good enough.” The plant set its sights on near-unity power factor at the 11 kV high-tension (HT) side and achieved a remarkable 0.999 lagging power factor, verified over more than a week of continuous operation.

The underlying story resonates far beyond the glass industry: it is about precision, reliability, and the kind of quiet, automated excellence that keeps heavy industry running smoothly. This blog unpacks the case study and explores why HT-level power factor correction is becoming a defining trend for energy-conscious manufacturers across India.

The Challenge: Diagnosing the Problem

The core ask was simple — improve the power factor from 0.987 to 0.999 at the 11 kV HT side — but the underlying issues were more nuanced. Glass production is an energy-intensive process involving large furnaces, motors, blowers, and compressors, many of which are inductive loads that drag power factor down.

High reactive power export was dragging the plant’s overall power factor down and triggering inefficiencies.

Power factor needed correction specifically at the 11 kV level, since utility incentives and penalties are calculated at the HT metering point.

The existing compensation system had limited accuracy and a slow response time, unable to keep pace with fluctuating industrial loads.

The client wanted a reliable, automatic, and maintenance-free solution that would not add to the plant’s operational workload.

The Solution: Static Reactive Power Compensation Referenced from HT

Envolta’s solution architecture is elegantly simple: power flows from the 11 kV HT side, through a transformer, down to the 415 V LT load. A Static Reactive Power Compensation (SRPC) system was installed at the LT side, but configured with a “Reference from HT Side” — ensuring that the correction applied actually moves the needle on the metric that matters to the utility.

Envolta conducted a detailed power quality study to calculate the exact reactive power injection required for near-unity PF at the 11 kV HT side.

The SRPC solution was installed at the LT side, configured to take its real-time reference signal from the HT side (11 kV).

Result: a power factor of 0.999 achieved at the 11 kV HT side.

The client independently verified an average PF of 0.999 (lagging) sustained over more than a week of continuous operation — not just a momentary peak reading.

The installed panels — cream-and-grey cabinets with a touchscreen HMI are operating on-site, with overhead cable trays framing a genuinely commissioned industrial installation rather than a rendering or stock image.

Key Benefits Achieved

PF fine-tuned at the HT side to 0.999 lagging.

Transformer losses reduced significantly.

PF incentives increased under utility tariff structures.

Load balanced across the distribution network.

ROI achieved in less than 12 months.

Client Testimony

“Envolta’s team understood our requirement precisely and delivered a solution that performed at the HT side exactly as promised.” — Maintenance Head, Leading Glass Manufacturing Facility,Gujarat.

Key Highlights

Power factor improved from 0.987 to 0.999 at the 11 kV HT side, verified over more than a week of continuous operation.

Industry: Glass Manufacturing, Vadodara, Gujarat — heavy inductive loads from furnaces, motors, and blowers.

Solution: a Static Reactive Power Compensation (SRPC) system at the LT side, referencing real-time data from the 11 kV HT side.

Certified under the Schneider Electric EcoXpert Power Management programme, adding third-party credibility.

Five tangible benefits: fine-tuned PF, reduced transformer losses, increased PF incentives, balanced load, and ROI under 12 months.

Conclusion: Small Numbers, Big Impact

By pairing a hard, verified number — 0.987 to 0.999 power factor at the 11 kV HT side — with clear visuals, an honest account of the original challenge, and a real photograph of the delivered solution, Envolta Systems and its glass manufacturing client have created content that speaks equally well to engineers, plant managers, and finance teams.For any industrial facility wrestling with reactive power penalties, ageing compensation equipment, or simply looking to squeeze more efficiency out of existing infrastructure, this case study offers a clear template: diagnose precisely, install intelligently, measure at the point that matters, and verify the results over time.

Facing similar power factor challenges? Contact Envolta Systems for a detailed power quality study: info@envoltasystems.com | +91 9825998879 | www.envoltasystems.com

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