News Details

 I. Overview of SBF Voltage Transformer Frequency Multiplier AC Withstand Voltage Tester

      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 inter-phase insulation, is a crucial item in transformer insulation testing. Due to the specific nature of longitudinal insulation testing, it is necessary to apply a frequency multiplier power supply device to increase the test voltage across winding insulation, 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 feedback to be simple to operate, reliable in performance, and effectively meets the needs of induced withstand voltage testing for transformers and instrument transformers.

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

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 windings is relatively high, the iron core saturates, and the magnetic flux in each single-phase transformer contains both fundamental frequency components and third harmonic components. The open delta connection of the secondary windings cancels out the fundamental frequency components, thereby achieving a frequency multiplier voltage output at the open delta terminals. By connecting an external single-phase voltage regulator to the windings, the third harmonic voltage can be adjusted.

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

IV. Usage Instructions for SBF Voltage Transformer Frequency Multiplier AC Withstand Voltage Tester

      The SBF Voltage Transformer Frequency Multiplier AC Withstand Voltage Tester is a split-type device, consisting of a frequency multiplier generator and a frequency multiplier control unit. It is equipped with overvoltage protection, an ammeter, frequency multiplier output, and a 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