Product Introduction

The TPSBF series induced withstand voltage test device (5kVA/360V 150Hz) is a lightweight voltage transformer induced withstand voltage test equipment, which utilizes the saturation characteristics of the magnetization curve of silicon steel sheet cores in the power frequency grid, and induces a zero-sequence third harmonic electromotive force in the secondary winding of the transformer connected in an open delta configuration.

The TPSBF series induced withstand voltage test device (5kVA/360V 150Hz) is one of the basic equipment for conducting multiple-frequency induced high voltage tests on small-capacity power transformers and cascade high-voltage potential transformers in power systems, power plants, substations, and power supply and distribution networks. It can also be used for multiple-frequency and multiple-voltage tests on various low-voltage electronic and instrument power transformers, inductor coils, and electrical appliance coils. Additionally, it can serve as a multiple-frequency power source with a power not exceeding 1 kilowatt for power supply or testing of certain special electrical equipment.

This product is a static frequency conversion device with low noise and small size, which can replace traditional frequency conversion units in high-voltage systems.

Working Principle

Three single-phase transformers have their primary windings connected in a star configuration and their secondary windings connected in an open delta configuration. When a symmetrical three-phase sinusoidal power supply is applied to the primary side and the voltage is raised to saturate the magnetic circuit of the iron core, the third harmonic component in the magnetic flux increases, correspondingly increasing the third harmonic voltage induced in the iron core coils. The 150 Hz (three times the power frequency) induced voltage output from the secondary side of the open delta generator serves as the test power supply voltage for the triple-frequency test.

When the triple-frequency generator is loaded (for example, with a JCC-220 type high-voltage cascade potential transformer), its current changes from inductive to capacitive. Due to the low power factor, the efficiency of the generator is relatively low, generally only about 20%. Therefore, a reactor can be connected to an idle winding of the test object for current compensation to improve the power factor of the entire test circuit.

Operating Environment

1. Working power supply: three-phase 380V/50Hz

2. Ambient temperature: -15℃ to 40℃

3. Altitude: not exceeding 1000m

Technical Specifications

1. Rated capacity: 5kVA

2. Input voltage: 380V

3. Input current: 22A

4. Output voltage: 360V

5. Output current: 14A

6. Output frequency: 150Hz