The necessity of testing the volt ampere characteristics of transformers

The volt ampere characteristic is the relationship between the voltage and current of the secondary winding of a current transformer. If the voltage is adjusted from small to large, the curve formed by plotting each current corresponding to the applied voltage in a coordinate system (voltage on the vertical axis, current on the horizontal axis) is called the volt ampere characteristic curve. Measuring the volt ampere characteristic is mainly to check the quality of the CT core, and to determine whether the winding of the transformer has defects such as inter turn short circuits by identifying the saturation degree of the core magnetization.

The volt ampere characteristic (also known as excitation characteristic) of current transformers is one of the most important handover tests for current transformers. It is listed as a necessary test item required by the GB50150-2016 national standard, along with the transformation ratio, angle difference, 10% error test, primary and secondary winding DC resistance, and power frequency withstand voltage test of current transformers.

Kvtester Electronics Technology Co.,Ltd. provides you with high-quality products CTA-1000C variable frequency volt ampere characteristic tester suitable for transformer calibration in power research institutes; The transformer manufacturer conducts factory calibration; Meet the preventive testing requirements of the power sector. On site calibration of current transformers does not require standard current transformers, current transformers, load boxes, voltage regulation control boxes, or high current wires. It uses extremely simple testing wiring and operation to achieve the calibration of current transformers, greatly reducing work intensity and improving work efficiency, making it convenient to carry out on-site transformer calibration work.

Product Features:

1. It has comprehensive functions and can meet the testing requirements of excitation characteristics (i.e. volt ampere characteristics), transformation ratio, polarity, secondary winding resistance, secondary load, ratio difference, and angle difference of various CTs (such as protection, metering, TP). It can also be used for testing excitation characteristics, transformation ratio, polarity, secondary winding resistance, ratio difference, etc. of various PT electromagnetic units.

2. On site calibration of current transformers does not require standard current transformers, current transformers, load boxes, voltage regulation control boxes, or high current wires. It uses extremely simple testing wiring and operation to achieve the calibration of current transformers, greatly reducing work intensity and improving work efficiency, making it convenient to carry out on-site transformer calibration work.

3. It can accurately measure CT ratio difference and angle difference, and can measure 0.2S-level current transformers with a ratio measurement range of 1-40000.

4. Based on advanced frequency conversion method to test CT/PT volt ampere characteristic curve and 10% error curve, the output voltage is only 180V AC voltage and 12Anms (peak value of 36A) AC current, but it can cope with CT testing with inflection points up to 60KV.

5. Automatically provide CT and PT parameters such as inflection point voltage/current, 10% (5%) error curve, accuracy limit factor (ALF), instrument safety factor (FS), quadratic time constant (Ts), remanence coefficient (Kr), saturated and unsaturated inductance.

6. Test to meet various transformer standards such as GB1208 (IEC60044-1), GB16847 (IEC60044-6), GB1207, etc., and automatically select which standard to test according to the type and level of transformer.

7. The testing is simple and convenient, with one click completion of CT direct resistance, excitation, transformation ratio, and polarity testing. In addition to load testing, all other CT tests use the same wiring method.

8. Full English dynamic graphical interface, no need to refer to the manual to complete wiring and parameter settings: dynamic display of parameter settings, automatically displaying relevant parameters based on the currently selected test project; Dynamically display the help wiring diagram, and display the corresponding wiring diagram based on the currently selected test project.

Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com