Principle and Applications of Impulse Coil Testers

Introduction to Impulse Coils Tester
Impulse coil testers, also known as digital interturn insulation testers, are devices used for non-destructive electrical testing of coil-wound components. The operating principle involves applying the same pulse voltage to both a standard coil winding and the coil under test, then comparing their transient waveforms to evaluate the quality of the tested coil. Transient waveforms, or damped oscillation waveforms occurring within the coil, can be used to assess the inductance, quality factor, number of turns, and interturn short circuits of the winding. Additionally, in the presence of a core, the material differences can also be determined. The occurrence of corona discharge under high voltage pulses can be used to evaluate insulation deficiencies.

LISUN LS8815 Series Impulse Coils Tester
The LS8815 series impulse coil testers employ advanced, high-stability high-voltage impulse power sources, significantly improving testing accuracy. The instrument quantifies various waveform parameters using microcomputer technology, displaying and judging them through intuitive waveforms. This makes the device easy to operate, providing accurate judgments with a high degree of automation.

Working Principle
The LS8815 series testers utilize a high-voltage charged small capacitor (low testing energy) to form an RLC parallel resonance with the coil under test. By analyzing the damped oscillation waveforms using precise sampling and processing technology up to 100Msps (customizable to 200Msps), the testers can detect insulation issues within the coil (such as interturn short circuits, layer-to-layer short circuits, and reduced insulation performance). This enables manufacturers and users to more effectively control product quality.

Applications

The LS8815 series impulse coil testers are characterized by fast measurement speed and good waveform repeatability, making them widely applicable in the following fields:
• Motors: Assess the quality of motor windings to ensure reliable operation.
• Power Frequency Transformers: Test the interturn insulation of transformer windings.
• Relays: Evaluate the quality factor and insulation performance of relay coils.
• Switching Power Transformers: Inspect the winding quality of switching power transformers.
• Demagnetization Coils: Ensure good interturn insulation of demagnetization coils.
• Automation Testing Systems: The LS8815 series instruments can also be integrated into automated testing systems to significantly enhance testing efficiency.

Conclusion
Impulse coil testers, particularly the LS8815 series, utilize high-stability high-voltage impulse power sources and advanced sampling and analysis technology to quickly and accurately assess the quality and insulation performance of coil windings. They have broad application prospects in fields such as motors, transformers, and relays. Their efficient, accurate, and automated features make them an indispensable tool in modern electronic and electrical testing.

 

 

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