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Triple-Frequency Test Transformer Main Technical Parameters

Product Overview

The induced overvoltage test of transformers and instrument transformers is an important test to ensure that the quality of transformers meets national standards. The longitudinal insulation induced overvoltage test of transformer windings, including inter-turn, inter-layer, inter-section, and inter-phase insulation, is a key item in transformer insulation testing. Due to the special nature of the longitudinal insulation test, it is necessary to apply a frequency multiplier power supply device to increase the test voltage between windings, thereby achieving the purpose of the withstand voltage test.

It is designed and manufactured to meet the above requirements. After extensive use by users, it has been proven that it is simple to operate, reliable in performance, and can effectively meet the needs of induced overvoltage tests for transformers and instrument transformers.

Triple-Frequency Test Transformer Main Technical Parameters

Working Principle

It consists of three single-phase transformers. The working principle is shown in Figure 1.

     The primary windings of the three single-phase transformers are connected in a star configuration, and the secondary windings are connected in an open delta. Because the voltage applied to the primary winding is relatively high, the iron core saturates, and the magnetic flux of each single-phase transformer contains both fundamental frequency components and triple-frequency components. The open delta connection of the secondary windings cancels out the fundamental frequency components, thereby achieving triple-frequency voltage output at the open delta terminals. By connecting an external single-phase voltage regulator to the winding, the triple-frequency voltage can be adjusted.

Triple-Frequency Test Transformer Main Technical Parameters

Technical Parameters