What is the difference between ASTM D1816 and IEC 60156?

Introduction

ASTM D1816 and IEC 60156 are two widely recognized standards used for testing the breakdown voltage of insulating oils. The breakdown voltage, also known as dielectric strength, is a critical parameter that determines the ability of an insulating oil to withstand high electric stress without breaking down.

ASTM D1816: Standard Test Method for Dielectric Breakdown Voltage of Insulating Oils Using VDE Electrodes

ASTM D1816 is a test method developed by the American Society for Testing and Materials (ASTM). It provides a standardized procedure to measure the dielectric breakdown voltage of insulating oils using VDE electrodes. The VDE electrodes consist of two flat metal disks with a gap between them. The oil sample is placed in the gap, and a voltage is gradually increased until the oil breaks down and sparks occur. The breakdown voltage is then recorded as the voltage at which breakdown occurs.

IEC 60156: Method for Determination of the Breakdown Voltage of Insulating Liquids

IEC 60156 is an international standard developed by the International Electrotechnical Commission (IEC). It specifies a similar method to ASTM D1816 for determining the breakdown voltage of insulating oils. However, IEC 60156 allows the use of various electrode configurations, such as needle electrodes, sphere gaps, and planar electrodes. This flexibility enables different laboratories to use the electrode configuration that best suits their testing needs.

Key Differences

While both ASTM D1816 and IEC 60156 serve the same purpose of measuring the breakdown voltage of insulating oils, there are some key differences between the two standards.

Firstly, ASTM D1816 specifies the use of VDE electrodes, while IEC 60156 allows for a wider range of electrode configurations. This gives IEC 60156 greater flexibility and adaptability in different testing environments.

Secondly, as ASTM D1816 is a standard developed by the American Society for Testing and Materials, it is primarily used and referenced in North America. On the other hand, IEC 60156 is an internationally recognized standard and is widely adopted in many countries worldwide.

Lastly, although the core principles and methodologies of both standards are similar, minor differences in test procedures and reporting requirements may exist. Laboratories should carefully follow the specific guidelines provided in each standard to ensure accurate and reliable results.

Conclusion

In summary, ASTM D1816 and IEC 60156 are two important standards for measuring the breakdown voltage of insulating oils. While ASTM D1816 specifies the use of VDE electrodes and is commonly used in North America, IEC 60156 allows for more electrode configuration options and has gained international recognition. Both standards have their merits and should be followed with precision to obtain accurate and comparable test results.