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Measuring voltage and current transformers used in commercial power account for current and voltage measurement, when the direct connection of the measuring device is not possible. Transformers are part of the measuring system and can increase the total error of the current and voltage measurement, introducing inaccuracies in the overall accounting of electric power. 

Such transformers at power facilities have a long service life (15-30 years) and failure to pass verification in a timely manner the measurement error may exceed the allowable limits in several times. The reasons for this may be the aging of material breach of the terms and electric modes.

If the error operation of the measuring current and voltage transformers are systematic, they must be taken into account in the calculation algorithms and AMR metering. 

Operated transformers are subject to mandatory initial and periodic calibration in accordance with the GOST 8.216-2011 8.217-2003 and GOST. 

Calibration in the laboratory requires the withdrawal of the transformer out of service for a period of from 2 to 4 weeks, which requires the organization of dismantling, shipping, and the availability of replacement fund.

Often, high-voltage measuring equipment is transportable, in this regard, there is a need to carry out on-site verification of their operation without dismantling and with a minimum of time, the output of these means of exploitation. these issues the decision is the organization of the verification of transformers at the site of operation with the help of a mobile calibration laboratory.


Phone:
 8 (0212) 360-622Raboty performed calibration skid Service Laboratory branch "Training Center" RUE "Vitebskenergo": 

1) Preparation for state checking of current transformers (primary current: from 1 to 4000 A; secondary current: 1A, 5A at nominal voltages of the primary windings is not higher than 110 kV) on site. Accuracy class transformers 0,2S below. 

2) Preparation for state checking voltage measuring transformers (nominal primary voltage 6; 6 / √3; 10; 10 / √3; 35; 35 / √3; 110; 110 / √3 kV rated secondary voltage: 100, 100 / √3 V) in the field. Accuracy class transformers and 0.5 below. 

Plotnikov, Dmitry Yuryevich

E mail-: pdj@vitebsk.energo.by