Penetration Voltage Tester

This standard references the adoption of international standards.IEC 897(1987)"Method for Determining the Dielectric Breakdown Voltage of Insulating Liquids" The company's news content is missing; therefore, no translation can be provided. 

1 Topic Content and Applicability Scope 

    This standard specifies two testing methods, namely, MethodAAnd methodBInsulation liquids are evaluated for their properties. Electrical strength withstand standard lightning strike in an electric field. 

    MethodA—— Stepwise Testing Method: Used to provide the breakdown voltage of insulation liquid under lightning impulse under specific conditions. No Chinese content provided. 

    MethodB——Sequential Test Method: A statistical test method used to examine insulating liquids under a specific condition Assumption of breakdown probability under the impact of lightning impulse voltage. 

    This standard applies to both used and unused insulating liquids. The tested insulating liquids are40℃ viscosity Dose should be lower than700mm2/s。 

    Two methods can utilize both positive and negative polarity impacts. However, these are used to determine the effect of chemical components on insulating liquids. When considering the effect of electrical impulse breakdown voltage, it is advisable to use negative polarity impulses. 

    These two methods are primarily used to establish standard procedures for evaluating the lightning impulse breakdown voltage of insulating liquids. They both Able to assess the insulating fluid's resistance to lightning surge characteristics, as well as changes in production processes, composition, or oil source. Varying breakdown voltage values due to lightning surge impacts. 

2 Cite Standard 

    GB 311.1～311.6 Insulation Coordination for High-Voltage Transmission and Transformation Equipment 

    GB 7597 Industrial Oil(Transformer oil, Turbine oil)Sampling Method 

3 Significance 

3.1 Insulating liquids used in electrical equipment may need to withstand transient voltages superimposed on the power frequency voltage during operation. The effects of operating voltage or lightning impulse voltage. 

    Transient voltages, whether unidirectional or oscillating, will inevitably result in either a positive or negative polarity. The transient voltage action process. Therefore, it is essential to understand the characteristics of insulating liquids under these conditions. 

    However, using a needle in the oil sample cup-Ball electrode experiments were conducted to obtain the impulse breakdown voltage and actual insulation system... The relationship between the breakdown properties of insulating liquids in transformers requires further work. 

3.2 The breakdown of insulating liquids is a complex phenomenon that has not been fully understood to this day. In summary, breakdown requires a stimulus... The propagation of emitted and pre-breakdown disturbances(Stream Column)。 

    Due to the fact that breakdown voltage depends on factors such as voltage waveform, the duration of voltage application, and the distribution of the electric field, therefore, in order to obtain Reaching comparable results requires clear and strict regulation of all these factors. Nevertheless, the conclusion... There may still be considerable dispersion, which can be attributed to the randomness of the pre-breakdown mechanism.