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Triple Frequency Test Transformer Product Overview

      The induced voltage withstand test for transformers and instrument transformers is an important test to ensure that transformer quality meets national standards. The longitudinal insulation induced voltage withstand test for inter-turn, inter-layer, inter-section, and inter-phase insulation of transformer windings is a crucial item in transformer insulation testing. Due to the particularity 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.

       The SBF triple frequency generator is designed and manufactured to meet the above requirements. It has been proven by extensive user use: its operation is simple, its performance is reliable, and it can effectively meet the needs of induced voltage withstand tests for transformers and instrument transformers.

2. Triple Frequency Test Transformer Working Principle

    This device consists of three single-phase transformers, and its 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 configuration. Because the voltage applied to the primary windings is relatively high, the iron core saturates, and the magnetic flux in each of the three single-phase transformers contains both fundamental frequency components and triple frequency components. The open delta connection of the secondary windings of the three single-phase transformers 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 windings, the triple frequency voltage can be adjusted.

3. Technical Parameters