Services

Low-voltage instrument transformers are produced for usage in low-voltage switchgears with rated current up to 3000 A. Transformers comply with ČSN regulations, international IEC standards and other foreign regulations. Naturally, they are approved by the Czech Metrology Institute as measuring equipment.

All produced transformators are tested using the most modern testing equipment such as TETTEX and OMICRON.

Verification of transformers for measurement (verification)

Our authorised metrology centre (AMS in Czech) ensures verification of transformers for current measurement. Authorisation has been issued by the Czech Office for Standards, Metrology and Testing (ÚNMZ in Czech) and our centre has been given the label of K128. This authorisation has also been approved by the Slovakian Office for Standards, Metrology and Testing. Standard verification includes transformers ranging from 1 A to 3 000 A for primary current and 5 A to 1 A for rated secondary current, possibly different. It is possible to verify transformers from other manufacturers as well.

This service includes:

• comparison with etalon measurement transformers by the differential method using the Tettex 2767 device (Tettex 2767 is an automatic instrument transformer test set which uses the differential method)
• Evaluation and recording the results by computing systems, eliminating the risk of an error made by personnel
• Issue of a certificate of verification 

Calibration of transformers for measurement

Our testing centre provides calibration of transformers for current measurement. Standard calibration includes transformers ranging from 1 A to 3 000 A for primary current and 5 A to 1 A for rated secondary current, possibly different.

This service includes:

• comparison with etalon measurement transformers by the differential method using the Tettex 2767 device (Tettex 2767 is an automatic instrument transformer test set which uses the differential method)
• Evaluation and recording the results by computing systems, eliminating the risk of an error made by personnel
• Issue of a calibration certificate

Other services

• Measurement of other parameters of current transformers on OMICRON testing equipment () (winding resistance, magnetic curve, exact determination of over-current numbers or factors, …) including issue of a testing protocol
• Isolation testing up to maximum voltage of 6 kV AC