News Details

 1. Overview of SBF Voltage Transformer Multiplier Frequency AC Withstand Voltage Test Set

      The induced withstand voltage test for 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 for inter-turn, inter-layer, inter-section, and inter-phase insulation of transformer windings is a key item in transformer insulation testing. Due to the particularity of longitudinal insulation testing, 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.

      This device is designed and manufactured to meet the above requirements. It has been proven by extensive user experience that it is simple to operate, reliable in performance, and can effectively meet the needs of induced withstand voltage testing for transformers and instrument transformers.

2. Working Principle of SBF Voltage Transformer Multiplier Frequency AC Withstand Voltage Test Set

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 configuration. Because the voltage applied to the primary windings is relatively high, the iron core saturates, and the magnetic flux in 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 a 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 of SBF Voltage Transformer Multiplier Frequency AC Withstand Voltage Test Set

4. Usage of SBF Voltage Transformer Multiplier Frequency AC Withstand Voltage Test Set

      The SBF Voltage Transformer Multiplier Frequency AC Withstand Voltage Test Set is a split-type device. It consists of a triple frequency generator and a triple frequency control unit, and is equipped with overvoltage protection, ammeter, triple frequency output, and voltmeter for monitoring and ease of use. The connection method between the terminals on the control unit panel and the main unit is shown in the figure below:

  (Press