ETFA-IV current transformer

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The principle of a current transformer is based on the law of electromagnetic induction. A current transformer consists of a closed core and windings. It has a very small number of turns in its primary winding, which is connected in series with the circuit where the current is to be measured; as a result, the entire current flowing through the circuit passes through it. The secondary winding has a larger number of turns and is connected in series with the measuring instruments and protection circuits. When a current transformer is in operation, its secondary circuit remains closed at all times, so the impedance of the coils in the measuring instruments and protection circuits is very low. The operating condition of the current transformer is thus similar to that of a short circuit. The instrument can automatically calculate the error curve for any point on the CT, as well as various result parameters such as the CT transformation ratio and its difference. 1. Safe and convenient to operate: It is a fully computerized device equipped with an imported high-performance CPU, ensuring high reliability. After setting the test values as indicated by the interface, there is no need for manual contact with the device under test, eliminating the tedious tasks such as manual voltage adjustment, manual data recording, organization, and curve plotting. Fast, simple, and convenient. It requires no computer knowledge and is easy to master, keeping testers away from high-voltage circuits and ensuring their safety. 2. Comprehensive functions: It can test the CT’s volt-ampere characteristics, automatically generate 5% and 10% error curves, determine the transformation ratio and polarity, and also output high current for testing the CT’s secondary circuit. 3. High output capacity: The maximum output voltage during the volt-ampere characteristic test is 1000V, and the maximum current during the turns ratio test is 600A; the output capacity of the instrument is 5KVA. 4. Complete range of optional accessories: The accessories include an external voltage booster, an external current booster, and an external voltage regulator. The maximum voltage that can be achieved with an external voltage booster is 2000V/3A, while an external current booster can handle up to 1000A. The maximum output of an external voltage regulator is 1500V/20A. When using an external voltage booster, it is possible to conduct volt-ampere characteristic tests on current transformers of the 500KV class with a current of 1A. 5. Good user interface: It features a large 320*240 pixel grid-based Chinese character graphic interface; after the test is completed, the volt-ampere characteristic curve can be displayed directly. The graphics are clear and aesthetically pleasing, making them easy to analyze. It comes equipped with a built-in micro printer that allows for the printing of curves and test results at any time. 6. User-friendly human-machine interaction: The instrument uses a high-performance optoelectronic rotary mouse as the input device, offering simple and convenient operation as well as a long service life. 7. Large data storage capacity: The instrument is equipped with a built-in Flash memory that allows it to store a large amount of test data. The data remains intact even in the event of a power loss, and after on-site testing is completed, the test results can be viewed and printed indoors. 8. Multi-channel human-computer interaction: In addition to being controlled via a rotary mouse, the instrument can also be connected to a computer through its built-in RS232 communication interface, enabling communication between the PC and the instrument. Testers can use the computer to control the instrument for conducting tests or to upload test data from the instrument. The software available on the instrument’s PC is powerful, user-friendly, and simple to operate; it allows for the saving and printing of test results, as well as the export of test data in EXCEL format for further editing. 9. The test results are easy to handle: after the test, the voltage and current values corresponding to each point on the curve can be displayed using a cursor. Printing options include printing only the data, printing only the curve, or printing both at the same time; moreover, the printing interval for the data can be set according to actual needs, and the type and label of the data to be saved can also be determined as required. 10. Multiple power supply mode: The instrument’s power supply can adapt to AC220V and AC380V inputs. When the AC power supply input terminal is connected to an AC220V voltage, the AC voltage output ranges from 0 to 600V; when the input terminal is connected to an AC380V voltage, the AC voltage output ranges from 0 to 1000V. Users can make a choice based on their actual needs.