Working principle, characteristics, and application analysis of dry-type test transformers

Dry type test transformers are widely used equipment in power systems and scientific research fields, mainly used for high-voltage testing and testing of insulation performance, DC withstand voltage, and leakage current of various electrical equipment. The following is a detailed analysis of its principle, characteristics, and applications:

1. Principle

The dry-type test transformer operates based on the principle of electromagnetic induction. When the input voltage (usually 200V or 400V) is connected to the matching control box, the input voltage is adjusted to the primary winding (low voltage) of the test transformer through an autotransformer regulator. By utilizing the principle of electromagnetic induction, an equal multiple of output high voltage can be obtained in the secondary winding (high voltage) according to its ratio to the number of turns in the primary winding, continuously adjustable from zero volts to the highest rated value. When conducting DC withstand voltage and leakage current tests, simply install the high-voltage silicon stack on the high-voltage output end to obtain DC high voltage, with an amplitude 1.414 times the power frequency high voltage value.

2. Characteristics

① High voltage output: Dry type test transformers can output high voltage to meet various high voltage testing and testing requirements.

Safe and reliable: equipped with zero protection device, residual voltage elimination device, high-voltage working sound and light alarm device, and overcurrent protection device to ensure safety and reliability during use.

② High insulation strength: weakened magnetic leakage, improved insulation strength and moisture-proof performance, and enhanced ability of transformers to withstand test short-circuit current shocks.

Compact structure: light weight, small size, beautiful appearance, stable performance, easy to use and carry, and no oil leakage.

③ Multi functional: suitable for testing the insulation performance, DC withstand voltage, and leakage current of various electrical equipment in power systems and power users on site. The wiring is simple and intuitive, and easy to use.

④ Strong customization: The operation part can be customized with overvoltage protection and overcurrent protection, which is a dual protection function.

3. Application

① Testing and maintenance of transmission lines: Dry type test transformers have high output power and can provide the required high voltage to meet the requirements of transmission line testing.

② Testing of power equipment and relay protection: For example, the relay protection equipment in substations needs to undergo regular calibration and testing. Dry type test transformers can provide the required high voltage and current to meet the requirements of these tests.

③ Laboratories and research fields: Researchers often need to conduct various electrical tests and research, such as high-voltage discharge, insulation strength testing, etc. Dry test transformers have high output power and adjustable output voltage, which can meet the needs of different tests.

In summary, dry-type test transformers are powerful, safe and reliable high-voltage testing and testing equipment, widely used in various aspects of the power system, as well as in laboratories and scientific research fields.

The ZC-501C series dry-type test transformer has the characteristics of light weight, small size, beautiful appearance, stable performance, and convenient use and portability. It is particularly suitable for on-site operation and is a new generation of AC/DC dual-purpose high-voltage test transformer in China. This series of dry-type test transformers is suitable for insulation performance testing of various electrical equipment in power systems and various power users, as well as high-voltage power supply in various voltage systems or devices with DC high voltage and small current of electrical products.

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