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, and each current corresponding to the applied voltage is drawn in a coordinate system (the voltage is in the vertical coordinate and the current is in the horizontal coordinate), the curve formed is called the volt ampere characteristic curve. Measuring the volt ampere characteristic mainly checks the quality of the CT iron core, and determines whether the winding of the transformer has defects such as inter turn short circuits by distinguishing the saturation degree of the iron core magnetization.
The volt ampere characteristic (also known as excitation characteristic) of current transformers is one of the most important handover tests. It is also listed as a necessary test item in accordance with the national standard GB50150-2016, 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 such as CTP-1000C variable frequency volt ampere characteristic tester, which is suitable for transformer calibration in power research institutes; Factory calibration conducted by the transformer manufacturer; 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 regulating control boxes, and high current conductors. It uses extremely simple testing wiring and operation to achieve current transformer calibration, greatly reducing work intensity and improving work efficiency, thus facilitating on-site transformer calibration work.
Product characteristics:
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, and other tests of various PT electromagnetic units.
2. On site calibration of current transformers does not require standard current transformers, current transformers, load boxes, voltage regulating control boxes, and high current conductors. It uses extremely simple testing wiring and operation to achieve current transformer calibration, greatly reducing work intensity and improving work efficiency, making it convenient for on-site transformer calibration work.
3. It can accurately measure the CT transformation ratio difference and angle difference, and can measure the 0.2S level current transformer with a transformation ratio measurement range of 1-40000.
4. Based on the advanced frequency conversion method to test the CT/PT volt ampere characteristic curve and 10% error curve, the output is only 180V AC voltage and 12Arms (36A peak) AC current, but it can handle 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 security factor (FS), secondary time constant (Ts), remanence coefficient (Kr), saturated and unsaturated inductance.
6. The test meets various transformer standards such as GB1208 (IEC60044-1), GB16847 (IEC60044-6), GB1207, and automatically selects which standard to test based on the type and level of the transformer.
7. The testing is simple and convenient, with one click to complete CT direct resistance, excitation, transformer ratio, and polarity testing. In addition to load testing, all other CT tests are conducted using the same wiring method.
8. The full Chinese motion graphics interface can complete wiring and set parameters without referring to the manual: dynamic display parameter setting, and automatically display its relevant parameters according to the currently selected test item; Dynamically display the help wiring diagram, displaying 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.
