High Temperature Voltage Breakdown (Oil Heating) Tester

Meet the standard:

ASTM D149

IEC 60243-1

ASTM D877

ASTM D1816

Product Introduction:

The High Temperature Voltage Breakdown (Oil Heating) Tester operates by immersing a sample of the electrical insulating material and the test electrodes in a temperature-controlled oil bath. The oil serves two primary purposes: to uniformly heat the sample to the specified test temperature and to act as a surrounding dielectric medium to prevent surface flashover around the edges of the sample during the high voltage test. A high voltage, typically at power frequency (e.g., 50 or 60 Hz), is applied across the electrodes and increased at a controlled rate until the insulating material breaks down, allowing a sudden flow of current. The voltage level at the point of breakdown is recorded as the dielectric breakdown voltage. This test provides essential data on how well an insulating material maintains its electrical integrity under thermal stress, which is a critical factor in designing reliable high-temperature electrical systems.

The instrument is used for testing:

Solid electrical insulating materials (e.g., polymers, ceramics, composites, laminates, films, papers)

Insulating liquids (e.g., transformer oil, cable oil) - Note: While the core function is for solid materials, the oil bath mechanism is also used for heated liquid dielectric testing.

Components or sub-assemblies incorporating insulating materials designed for high-temperature use.

Product Advantages:

Evaluates Performance Under Thermal Stress: Specifically designed to measure dielectric strength at elevated temperatures, simulating real-world operating conditions for high-temperature applications.

Uniform Temperature Control: The oil bath provides uniform heating of the test specimen, ensuring the entire sample is at the specified test temperature.

Prevents Surface Flashover: The insulating oil acts as a dielectric medium surrounding the sample, helping to prevent flashover and ensuring the breakdown occurs through the bulk of the material as intended by standards like ASTM D149.

Standard Compliant: Designed to perform tests according to relevant international and national standards for dielectric breakdown testing at high temperatures.

Objective and Quantitative Results: Provides a numerical value for the voltage breakdown strength at a specific temperature.

Critical for Material Selection and Quality Control: Essential for choosing appropriate insulating materials for high-temperature electrical applications and verifying their quality.

Versatile for Various Materials: Can be used to test a range of solid insulating materials and liquids.

Product Features:

Based on typical High Temperature Voltage Breakdown Testers using oil heating:

High voltage source capable of generating AC voltage (and sometimes DC) up to a specified maximum test voltage.

Voltage control system that allows the voltage to be increased at a controlled, uniform rate as specified by test standards (e.g., V/s).

Oil bath (tank) constructed from appropriate materials capable of safely containing insulating oil at high temperatures.

Heating system integrated with the oil bath for precise temperature control of the insulating oil.

Temperature control system with digital display and setting for the oil bath temperature, typically including a temperature sensor immersed in the oil near the sample.

Electrode system designed to hold the test specimen and apply voltage across it while immersed in the oil bath, often with interchangeable electrodes for different sample types and sizes.

Breakdown detection circuit that senses the sudden increase in current when the insulating material fails and automatically shuts off the high voltage.