High-voltage hipot tester SBF

DCfor insulating oilAC

Overview
The SBF Triple-Frequency Induction HV Withstand Voltage Tester is a purpose-built high-voltage test set for induction withstand-voltage testing of high-voltage transformers, voltage transformers, motor windings and small transformers. It can also provide a short-duration 150 Hz power supply. The unit uses a three-core five-column magnetic structure designed for stable, reliable operation and to meet applicable national design standards.

Applications

• Frequency-doubling induction withstand-voltage tests for voltage transformers (commonly for 35–220 kV cascade voltage transformer testing).
• Phase-splitting frequency-doubling induction withstand-voltage tests for power transformers.
• Induction withstand-voltage testing of other coil-type electrical products and induction testing of motor windings and small transformers.

Technical parameters

• Input voltage: three-phase 380 V, 50 Hz.
• Output voltage (single-phase): 300 V, 500 V, 800 V, 1000 V at single-phase 150 Hz (for higher output voltages an external step-up transformer is required).
• Output capacity: 20% of product rated capacity.
• Harmonic distortion:
• No-load continuous operation time: ≤ 5 minutes.
• Duration of the test object under rated voltage: 40 seconds.

Key characteristics

• Three-core five-column transformer structure allowing simple operation and stable performance; core designed to operate at magnetic flux density above saturation to achieve required induction characteristics.
• Capable of induction testing on motor windings and small transformers.
• Can serve as a short-duration 150 Hz power supply for specific test requirements.

Standards and typical uses

• Designed with reference to national standards (referenced GB311-61 and Preventive Test Code for Electrical Equipment).
• Typical use: AC withstand-voltage testing of cascade voltage transformers (35–220 kV) and insulation strength assessment of main and secondary transformer windings.
• Operational note: higher output voltages require an external step-up transformer; the equipment is intended for short-duration 150 Hz supply and short rated-voltage test durations.