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The insulated cylinder type test transformer (power frequency test transformer) is mainly used to test the insulation level of various insulating materials, insulation structures, and electrical products under power frequency voltage. It also serves as a partial discharge-free power frequency test power supply for transformers, mutual inductors, lightning arresters, and other test objects. It is widely used in electrical manufacturing departments, power operation departments, scientific research institutions, and universities. The insulated cylinder type test transformer adopts an epoxy cast cylinder shell with full insulation treatment, which improves insulation strength and output voltage. The maximum voltage level of a single device can reach 750kV. The insulated cylinder type test transformer has strong moisture resistance, effectively weakens magnetic flux leakage, and greatly increases the ability to withstand the impact of test short-circuit current.

The insulated cylinder type test transformer (power frequency test transformer) has passed the ministerial product appraisal, and its main technical performance is at the leading level in China, reaching the advanced level of similar international products. Currently, the single-unit voltage of insulated cylinder type transformers produced in China can reach 750kV. The 750kV insulated cylinder type test transformer has opened a new era for insulation test transformers, and has opened a new era for the use of insulated cylinder type test equipment outdoors at high altitudes in China and even internationally. It has achieved the "world's first" in three indicators: voltage level, altitude conditions, and appearance structure.

1. The complete set of equipment has strong compatibility, complete voltage and capacity series, and comprehensive functions; 2. Low impedance voltage, system impedance not greater than 5%, meeting the requirements for AC pollution tests;

3. Adopts fast electronic protection device with high reliability.

4. Adopts epoxy cast cylinder shell with full insulation treatment, improving insulation strength and output voltage. The maximum voltage level of a single device can reach 750KV.

5. Strong moisture resistance, effectively weakens magnetic flux leakage, and greatly increases the ability to withstand the impact of test short-circuit current.

The variable frequency series-parallel resonant test transformer uses the principle of series resonance. By adjusting the output frequency of the frequency conversion controller, the inductance L of the reactor in the circuit and the capacitance C of the test object resonate in series, and the resonant voltage is the voltage applied to the test object.

The variable frequency series-parallel resonant test transformer is widely used in electric power, metallurgy, petroleum, chemical, and other industries. It is suitable for capacitive test objects with large capacity and high voltage, such as generators, transformers, GIS, high-voltage cross-linked cables, mutual inductors, bushings, etc., for handover tests and preventive tests.

The variable frequency series-parallel resonant test transformer provides power supply through the frequency modulation controller. The test voltage is initially boosted by the excitation transformer, and then the high voltage is applied to the reactor L and the test object CX. By changing the output frequency of the frequency modulation controller, the circuit is in a series resonance state; adjust the output voltage of the frequency modulation controller to make the high voltage on the test object reach the required voltage value. The resonant frequency of the circuit depends on the capacitance CX of the test object and the inductance L of the reactor, and the resonant frequency.