What is IEC 60112?

IEC 60112 is an international standard that specifies the method for determining the electrical conductivity of solid insulating materials. It is used to assess the comparative tracking index (CTI) of these materials, which is an important factor in evaluating their safety and performance in electrical equipment. Understanding the principles and requirements of IEC 60112 can help manufacturers ensure the reliability and quality of their products.

Principles of IEC 60112

The IEC 60112 test involves subjecting a sample of the insulating material to a series of voltage impulses while it is immersed in a conducting electrolyte solution. The sample is exposed to different voltages for defined periods of time, and the conductivity of the solution is continuously measured. As the voltage increases, the risk of electric breakdown or tracking on the surface of the material also increases. The CTI value is determined by the time it takes for the electrical current to flow between two electrodes placed on the sample's surface. Higher CTI values indicate better electrical insulation properties and increased resistance to tracking.

Requirements for Testing

In order to comply with IEC 60112, the testing must be conducted under controlled temperature and humidity conditions. The standard specifies the dimensions and configuration of the sample as well as the properties of the electrolyte solution. The voltage waveform, including the duration and frequency of the impulses, is also defined. During the test, the leakage current is monitored, and if it exceeds the predetermined limit, the test is considered as failure.

Importance of IEC 60112

The CTI value determined by IEC 60112 testing provides valuable information to engineers and designers when selecting insulating materials for electrical equipment. It helps ensure that the materials used can withstand the expected electrical stresses and minimize the risk of malfunctions or accidents due to electrical breakdown or tracking. Compliance with IEC 60112 also assures customers and regulatory bodies that the manufacturer takes safety seriously and meets international standards.