Quick Answer
Power quality analyser calibration verifies voltage accuracy (1V–600 V AC), current accuracy (using calibrated CT/shunt), active power (W), reactive power (VAR), power factor (0–1), harmonic content (THD%), and frequency at 50 Hz — using a Fluke 6105A or equivalent power quality reference source.
Key Takeaways
- Power quality calibration covers: voltage, current, active power, reactive power, power factor, harmonics, frequency.
- Reference source: Fluke 6105A precision power quality standard or Omicron CMC test set.
- BEE (Bureau of Energy Efficiency) energy audits require NABL-calibrated power quality analysers.
- NABL calibration certificate includes power factor and harmonic distortion accuracy.
- Prism calibrates Fluke 435, 437, 1760; Hioki 3197; Chauvin Arnoux CA8335 and similar.
Power Quality Parameters Calibrated
| Parameter | Unit | Test Points | Typical Uncertainty |
|---|---|---|---|
| Voltage (AC) | V | 100 V, 230 V, 400 V, 600 V | ±0.1% of reading |
| Current (AC) | A | 0.1 A, 1 A, 10 A, 100 A | ±0.1% of reading |
| Active Power | W, kW | At unity PF, 0.8 PF lag | ±0.2% of reading |
| Reactive Power | VAR, kVAR | At 0.6 PF (θ=53°) | ±0.3% of reading |
| Power Factor | — | 0.5, 0.7, 0.85, 0.95, 1.0 | ±0.005 PF |
| Frequency | Hz | 50 Hz, 49.5 Hz, 50.5 Hz | ±0.01 Hz |
| Harmonics THD | % | 5th, 7th, 11th, 13th harmonics | ±1% THD |
Power Quality Calibration for BEE Energy Audits
The Bureau of Energy Efficiency (BEE) Perform, Achieve and Trade (PAT) scheme requires designated consumers (DCs) to submit energy audit data measured with calibrated instruments. BEE-empanelled energy auditors are required to use NABL-calibrated power quality analysers, energy meters, and flow meters for audit measurements. Prism provides NABL calibration certificates accepted by BEE for energy audit submissions.
Frequently Asked Questions
Is NABL calibration of power analysers required for BEE audits?
Yes. BEE guidelines for energy audits (and PAT scheme data submission) specify that measurement instruments must be calibrated. NABL accreditation is the accepted standard in India for calibration.
Does Prism calibrate three-phase power quality analysers?
Yes. Prism calibrates 3-phase power quality analysers for balanced and unbalanced load conditions, including unbalance factor, negative sequence voltage, and 3-phase reactive power.
Can Prism calibrate energy meters (kWh meters)?
Yes. Prism calibrates single-phase and three-phase energy meters (electromechanical and electronic) used for industrial energy monitoring. Calibration per IS 1248, IS 13779.
How often should power quality analysers be calibrated?
Annual NABL calibration is standard. Instruments used for legal-for-trade energy metering should be calibrated every 6 months.
What is THD and why must it be calibrated?
THD (Total Harmonic Distortion) measures the harmonic content of voltage or current waveforms. Accuracy of THD measurement depends on the analyser's frequency response and filter characteristics — both verified during NABL calibration.
Written by
Er. Parthiv Kinariwala
Managing Director · Prism Calibration Centre · NABL CC-2480 · Ahmedabad
Er. Parthiv Kinariwala founded Prism Calibration Centre in 2004 and has over 20 years of hands-on experience in calibration engineering, NABL accreditation, and industrial compliance. His team performs 10,000+ calibrations annually from the Vatva GIDC laboratory, serving 5000+ industries across Gujarat.
Prism Calibration Centre — Vatva GIDC, Ahmedabad
Prism Calibration Centre
F-101, Rudraksh Complex 2, Phase 3, GIDC Vatva, Near Jasoda Nagar Cross Road, Ahmedabad — 382445, Gujarat, India
Phone: +91 98245 26444
Email: info@prismcalibration.com
NABL: CC-2480 · ISO/IEC 17025:2017
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