Combined with the current development of the market, micro-current transformer application range is more and more extensive, at the same time its specification model is more and more abundant, with a higher cost performance, users can choose according to their needs.
There are also some precision micro-current transformers, including annular silicon steel or slope mo alloy Core optional, to meet the requirements of different users. In practical applications, this precision micro-current transformer can be used in some of the more special working situations.
Typically, the silicon steel core is suitable for medium precision, low cost requirements, current measurement and current relay, while the slope mo alloy core is suitable for high precision, small phase error requirements, for current, power and power monitoring equipment, the cost is relatively high. In production, the shell material of this series of miniature current transformers is made of PBT resin material, and the flame retardant grade reaches 94-v0. Internal insulation using epoxy resin sealing, and in line with environmental requirements. In practical application, what is the self-school confirmation method for the test device?
For the technical requirements of the product is: the difference between the same phase component is ± 0.01%, the orthogonal component difference ±0.5 within the division. Therefore, we should first choose the appropriate confirmation instrument, at the same time to ensure the environmental conditions of the test, usually requires a load resistance of 0 (ambient temperature of 10℃-35℃, relative humidity is not greater than 80%, the workplace around the absence of calibration work independent of the electromagnetic field).
Using the micro current transformer of the test machine as the current transformer under test, it is tested on the transformer test device, and the difference and angle difference of each point are recorded. After that, the data measured by the instrument should be compared with the actual test data of the micro current transformer provided by the manufacturer, and the difference between the same phase components is ± 0.01%, and the orthogonal component difference within ±0.5 is qualified. Keep in mind that the calibration cycle must not exceed one year and can be calibrated at any time if necessary, implemented by metering managers, and require relevant records.