Price of AC/DC voltage withstand tester

1YDJPrice of AC/DC voltage withstand testerOverview:

Inflatable test transformer is a testing equipment used for power equipment detection and preventive testing. With the development of China's power industry, the voltage level requirements for test transformers are becoming increasingly high, and traditional oil immersed test transformers are increasingly unable to meet the requirements of on-site work in terms of volume, weight, and performance.

With the progress of basic scientific research in China, the application of new materials and processes has pushed the new medium sulfur hexafluoride gas into the field of power equipment applications. Due to its excellent insulation and arc extinguishing properties, as well as non flammability, sulfur hexafluoride gas has been widely used as a new insulation medium.

After years of effort, our company has successfully developed an inflatable test transformer. Compared with traditional oil immersed lightweight test transformers, this series of products reduces weight by 20% -60% (depending on voltage and capacity level), and has no oil pollution. The voltage level of a single inflatable test transformer can reach 300KV. Due to the use of new production processes, the technical performance of the product has been greatly improved, making it particularly suitable for on-site work and frequent mobile working conditions.

2、 Structure:

1. The design concept, material selection, and manufacturing process of the YDJ series products are all brand new. Therefore, not only is it small in size, light in weight, and beautiful in appearance, but all technical indicators meet the requirements of DL/T848.2-2004 standard. The YDQ series products are made of high-quality cold-rolled DQ-151 oriented silicon steel sheets stacked into multi-stage cylindrical frame shaped iron cores, which are directly and continuously wound with QZ type wires on a specially designed high-strength insulation cylinder to form high-voltage tower coils. The outer shell is of appropriate size and filled with SF6 gas.

2. The difference between YDQ (JZ) products and YDQ products lies in the clever installation of a high-voltage rectifier silicon stack inside a high-voltage sleeve, which can be transformed into a high-voltage AC output or a high-voltage DC output through the insertion and extraction of a short-circuit rod.

3. The difference between YDQ (C) products and YDQ products lies in the internal structure of the casing.

4、 Working principle:

The operation box of the zero position interlocking device with overcurrent automatic tripping and sudden pressure prevention is used to input the power supply. The voltage is regulated by an autotransformer and input into the primary winding of the YDQ inflatable AC test transformer. According to the principle of electromagnetic induction, the secondary (high voltage) winding can obtain the same multiple of voltage amplitude - power frequency high voltage by the ratio of its turns to the primary winding. This power frequency high voltage can be rectified by a high-voltage silicon stack and filtered by a stabilizing capacitor to obtain a DC high voltage, with an amplitude twice the effective value of the power frequency high voltage.

7YDJPrice of AC/DC voltage withstand testerOperation test method:

1. Connect the wires as shown in the diagram and check if the internal gas pressure indicated by the pressure gauge is normal (≥ 0.3MPA)

2. Insert the short-circuit rod into hole J during AC withstand voltage testing, conduct a DC leakage test, and remove the short-circuit rod.

3. Current limiting resistor configuration: Power frequency withstand voltage of 0.3-1 ohms per volt, DC withstand voltage of 5-10 ohms per volt, generally not required for testing.

4. Remove the lead wires, sleeves, and body dirt of the test sample, and use shielding measures if necessary.

5. The preparation work and safety measures are ready, and the equipment will be air tested once.

6. Connect the test sample and use shielded wires for DC testing to eliminate stray leaks.

7. Turn on the power supply, and the green light for the power instruction of the control box (cabinet) will turn on.

8. Press the start button, and the start indicator light will turn on.

9. For the control box, power it evenly clockwise and watch the voltmeter reach the rated voltage value.

10. Continuously regulate the withstand voltage time and monitor the ammeter reading.

11. When the withstand voltage time is up, pay attention to the KV meter and quickly and uniformly drop to zero.

12. After conducting the experiment shown in Figure 2, discharge through a resistor using a discharge rod, and then discharge directly to the ground.

13. After the high-voltage part may be discharged one by one by the charging parts, the high-voltage leads may be changed or removed, and all leads will terminate the test at this point.