Penetration Strength Tester

This standard adopts the international standard.IEC 897(1987)"Method for Determining the Insulating Liquid Lightning Impulse Breakdown Voltage" Established. 

1 Subject Content and Applicability Scope 

    This standard specifies two testing methods, namely, MethodAAnd methodBInsufficient Chinese content provided for translation. Please provide the Chinese text to be translated. Electrical strength under standard lightning strike conditions in an electric field. 

    MethodA—— Step-by-Step Testing Method: Used to provide the breakdown voltage of insulation liquids under specific conditions, due to lightning impulse No Chinese content provided. Please provide the text to be translated. 

    MethodB——Sequential Test Method: A statistical testing 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 are:40Unfortunately, the provided text "℃时的粘" does not contain any English content and is likely a placeholder or incomplete information. Therefore, I am unable to translate it into English. Please provide a complete and coherent news content in Chinese for translation. Please provide the Chinese content that needs to be translated into American English.700mm2/s。 

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

    These two methods are primarily used for establishing standard procedures for determining the breakdown voltage of insulating liquids under lightning impulse. They both Can be used to evaluate the lightning strike resistance characteristics of insulating liquids, as well as changes in production processes, component composition, or oil sources. Variations in the breakdown voltage of lightning surge. 

2 Quote Standards 

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

    GB 7597 Petroleum for Power Use(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 effect of operating voltage or lightning surge 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 the insulating liquid under these conditions. 

    However, using a needle in the oil sample cup-Ball electrode experiments were conducted to obtain the breakdown voltage under impact and the actual insulation system. The relationship between the breakdown characteristics of insulating liquids and the unified medium still requires further investigation. 

3.2 The breakdown of insulating liquids is a complex phenomenon that remains unclear to this day. In summary, breakdown requires intense... No Chinese content provided for translation.(Flow Column)。 

    Due to the fact that breakdown voltage depends on factors such as voltage waveform, the duration of voltage application, and electric field distribution, therefore, to achieve Achieving comparable results. All these factors must be clearly defined and strictly controlled. Nevertheless, the conclusion... There may still be considerable dispersion, which can be attributed to the randomness associated with the pre-breakdown mechanism.