News Details

Instrument SBF Voltage Transformer Multiplier Frequency AC Withstand Voltage Test Product Overview

      The induced withstand voltage test of transformers and instrument transformers is an important test to ensure that the quality of transformers meets national standards. The longitudinal insulation induced withstand voltage test of transformer windings, including inter-turn, inter-layer, inter-section, and phase-to-phase insulation, is an important item in transformer insulation tests. Due to the particularity of the longitudinal insulation test, it is necessary to apply a multiplier frequency 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. It has been proven by extensive user use: its operation is simple, performance is reliable, and it can well meet the needs of transformer and instrument transformer induced withstand voltage tests.

II. SBF Voltage Transformer Multiplier Frequency AC Withstand Voltage Tester Working Principle

It 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 winding is relatively high, the iron core saturates, and the magnetic flux 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 from the open delta. By connecting an external single-phase voltage regulator to the winding, the triple frequency voltage can be adjusted.

III. SBF Voltage Transformer Multiplier Frequency AC Withstand Voltage Tester Technical Parameters