The ProEnerga calibration laboratory, dedicated to verifying accuracy and calibrating high-voltage current, voltage, and combined instrument transformers, commenced operations in 2011. Its establishment was driven by the expectation that the number of instrument transformers requiring verification would increase as a result of modernization projects carried out by power utilities, including the replacement of existing transformers with new units whose accuracy must be verified in accordance with applicable regulations.
Expansion of Calibration Scope
Over time, there was an increasing demand for the calibration of medium- and low-voltage instrument transformers. In response to our clients’ expectations, we upgraded our laboratory with the necessary test equipment, enabling us to calibrate instrument transformers within the following ranges:
- 0.5 A up to 5000 A for current transformers (no voltage restriction),
- 0.44 kV up to 110 kV for voltage and combined instrument transformers.
Accreditation PCA AP166
Since 2016, we have held accreditation from the Polish Centre for Accreditation (PCA) for the calibration of current, voltage, and combined instrument transformers under accreditation number AP166.
Holding an accredited laboratory certificate places us among competent and reliable laboratories and requires us to continuously demonstrate personnel competence in the following areas:
- requirements of standards and regulations related to quality management systems,
- standards specifying requirements for instrument transformers,
- metrological requirements related to measurements and uncertainty estimation,
- criteria for conformity assessment.
In addition, accreditation obliges us to:
- proper supervision of measuring equipment – continuous monitoring of its performance, internal and external verification intervals, and full identification and traceability of calibration dates,
- demonstrating measurement traceability – systematic calibration of measuring instruments and reference standards at the Central Office of Measures,
- conducting internal comparisons (internal proficiency testing),
- participating in interlaboratory comparisons – benchmarking our results against those of the Central Office of Measures.
