DAHU electrical specializes in the production of 0.5-40.5kv transformers. It has cooperated with many national power bureaus for 10 years and exported to foreign markets. If
there is any quality problem within the warranty period, it can be replaced free of charge.
Accuracy Ratings:
According to the IEEE C57.13 standard, the accuracy ratings for PTs and VTs require a constant allowable range of error over the range of 90% to 110% of rated voltage
. The accuracy class defines the maximum ratio deviation over the specified load range. A PT or VT is considered to have an accuracy class of 0.3 if the maximum ratio error is ±0.3% over the standard load range
.
JDZ10-10 type voltage transformer:
This is a voltage transformer for indoor use with an accuracy class of 0.5 for 10kV systems. Its ratio is 11000/110V, rated frequency is 50Hz and rated capacity is 50VA
The rated capacity is 50VA.
GFJDZ1053-10 high accuracy indoor voltage transformer:
This product is used for metering and relay protection of 12kV and below circuits, characterized by high accuracy
.
Indoor resin insulated PT/VT:
Medium voltage indoor PT/VTs are cast in epoxy resin and designed for high accuracy medium voltage measurements up to 36kV.
.
Application of Accuracy Class:
For PT, if the accuracy class is 0.3WXMYZ, it will maintain 0.3 accuracy class from 0VA to 200VA (Z load).The accuracy of PT varies linearly with load. At the factory, accuracy is recorded at zero and full load, and this data is available from the manufacturer on request
.
Selection of Accuracy Rating:
Modern digital meters and wattmeters have very low loads and the accuracy of the VT/PT can be improved by selecting a VT with a lower full load. For example, if 0.3WXM (35VA) is used instead of 0.3WXMYZ (200VA), the actual load of 15VA will be in the middle of the accuracy graph, with a ratio correction factor (RCF) close to 1 and a phase angle error close to zero
.
This information provides an overview of the accuracy classes and associated technical parameters of PT/VTs used in indoor voltage measurement instruments. Accuracy rating is an important consideration when selecting and applying voltage transformers, and it directly affects the accuracy and reliability of voltage measurements.
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Accuracy Ratings:
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