High Temperature Voltage Breakdown (Air Heating) Tester

Meet the standard:

ASTM D149

IEC 60243-1

Product Introduction:

The High Temperature Voltage Breakdown (Air Heating) Tester operates by placing a test specimen of solid electrical insulating material between two electrodes inside a temperature-controlled oven or chamber. The chamber is heated to the specified test temperature, and a high voltage, typically AC or DC at power or specified frequencies, is applied across the electrodes. The voltage is increased at a controlled rate until the insulating material fails electrically, resulting in a breakdown (puncture). The voltage at which this breakdown occurs is recorded as the dielectric breakdown voltage. The heated air environment allows for testing materials in conditions where they are exposed to both high temperature and air, which can be relevant for surface flashover characteristics in addition to bulk breakdown strength. This type of testing is essential for selecting appropriate insulating materials, ensuring product quality, and predicting the performance and lifespan of electrical components operating at elevated temperatures in air.

The instrument is used for testing:

Solid electrical insulating materials (e.g., plastics, rubbers, films, laminates, ceramics, composites, papers) used in applications requiring thermal and electrical endurance in air.

Components or sub-assemblies incorporating solid insulating materials for high-temperature air environments.

Product Advantages:

Evaluates Performance in High-Temperature Air: Specifically designed to measure dielectric strength at elevated temperatures in an air environment, simulating real-world exposure conditions.

Provides Uniform Temperature: The heated air chamber ensures the test specimen is uniformly brought to the specified test temperature.

Standard Compliant: Designed to perform tests in accordance with 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 under defined temperature and air conditions.

Critical for Material Selection and Quality Control: Essential for choosing and verifying the quality of insulating materials used in high-temperature electrical applications exposed to air.

Versatile for Solid Materials: Can be used to test a range of solid electrical insulating materials in various forms.

Avoids Oil Immersion: Suitable for testing materials where oil immersion is not desirable or representative of the end application.

Product Features:

Based on typical High Temperature Voltage Breakdown Testers using air 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).

High-temperature oven or chamber with integrated electrode system designed for electrical testing.

Heating system integrated with the chamber for precise temperature control of the air.

Temperature control system with digital display and setting for the chamber temperature, typically including a temperature sensor near the test specimen.

Air circulation system within the chamber to ensure uniform temperature distribution.

Electrode system designed to hold the test specimen and apply voltage across it within the heated air environment, often with interchangeable electrodes for different material types and sizes.

Breakdown detection circuit that senses the sudden increase in current upon electrical failure of the insulating material and automatically shuts off the high voltage.

Voltage measurement system to accurately record the breakdown voltage at the point of failure.

Safety enclosure or cabinet with interlocks to protect the operator from high voltage and high temperatures.

Digital display for showing test voltage, breakdown voltage, temperature, and potentially current.

(Optional) Software for test control, data acquisition, and reporting.