Current Transformer Calibrator

The high-voltage electric energy metering devices of power plants and substations, as well as the electric energy metering devices of a large number of users, are related to the interests of power generation, transmission, power supply and users. In order to ensure accurate measurement, inspection must be carried out.

Our company's HMCT-H Current transformer calibrator is developed with high-end testing technology, large-scale electronic circuit design, and compliance with relevant national regulations. It solves the problems of high working intensity and cumbersome operation of the current transformer in the field verification. At the same time, the product has reliable performance and powerful functions.

1. HMCT-H Current transformer calibrator has the function of recursive method to measure current transformer error, which is convenient for on-site verification of metering devices.

2. On-site verification of current transformers does not require standard current transformers, current transformers, load boxes, voltage regulating control boxes and large current wires. Very simple test wiring and operation are used to achieve current transformer verification, which greatly reduces work Strength and work efficiency are improved, and it is convenient to carry out on-site verification of transformers.

3. The HMCT-H Current transformer calibrator has a standard voltage transformer equivalent to the same transformation ratio of the current transformer under test, and its accuracy can reach level 0.05, which can accurately measure the transformation ratio and ratio of the current transformer under test. No-load error. Then combine the test results of impedance and admittance to calculate the error of the transformer.

4. Adopt the different frequency power supply test close to the power frequency to prevent on-site power frequency electromagnetic radiation and series interference.

5. The measurement range is wide, ranging from 5A/5A to 31500A/5A or 5A/1A to 6300A/1A.

6. It has the function of testing the transformation ratio of current transformer and the internal resistance of the secondary winding.

7. It adopts 800×600 high-resolution large-screen TFT color LCD touch display, with a humanized interface and operation design, and the use of a touch screen to assist the operation makes the operation more convenient and faster.

8. Using precise software algorithms, the accuracy of measurement data is further improved.

9. Intelligently judge the status of external wiring, prompt wiring error, transformation ratio, polarity error, etc.

10. Automatically round up the test data and judge whether it is out of tolerance. The out-of-tolerance data is displayed in orange, and the out-of-tolerance is displayed in the lower right corner of the window. The data characteristics of the transformer are intuitive and clear.

11. The first in China to test the transformation ratio and polarity function of voltage transformers at the same time.

12. Directly issue on-site verification conclusions, qualified or out of tolerance.

13. The large-scale memory can store up to 1000 pieces of field test data.

14. Use the RS232 or USB interface to connect to the computer to print the data certificate.

15. The use of engineering plastic mold chassis is shock-proof and pressure-proof to ensure the safety of on-site operators and equipment.

1、Current transformer error measurement part

①The accuracy of the whole machine: 1/3 of the error limit of the measured current transformer

②Test Range：5A/5A~31500A/5A or 5A/1A~6300A/1A

Note: For a current transformer with a secondary current of 1A, the ratio can reach 31500A/1A through the equal-ampere-turn measurement method.

The test methods of other current transformer transformation ratios that are not in the table are as follows:

Use the equal-ampere-turn method to test the current transformer. For example, if you need to test a 1000A/5A transformer, please pass the test wire of the instrument through two turns of the current transformer under test, and then the current transformer test interface in the instrument The primary current output is 500A. This test method does not affect the validity of the transformer test data.

Similarly, other transformation ratios use the following processing methods:

③Working range of the measured current transformer： 1％～200％

④Secondary load：2.5VA～300VA 、COSφ＝0.1～1.0

⑤Accuracy range of tested current transformer：1.0、0.5、0.5S、0.2 and 0.2S

⑥Resistance and admittance measurement error ≤5.0％

Measuring range： R： 0.00Ω～20.0Ω

Y: 0.000mS～100.0mS

2、Voltage transformer calibrator part

Ratio test range：1KV-500kv

3、Instrument power consumption：20VA

4、Instrument accuracy level：0.05S level