电压击穿试验仪的常规反映和允许条件之内的影响因素做出以下解释

This precision instrument company normal reactions to the breakdown voltage test apparatus and allow the influence factors of conditions within the following interpretation

The influence factors of breakdown voltage test:

Voltage waveform and time influence the voltage effect.

Breakdown test medium electrical effects: high pressure tend to put the samples in a certain medium （such as transformer oil）. Its purpose is to narrow the sample size to prevent flashover. But medium itself performance to belong to electric breakdown had significant effect on the material, but little effect mainly thermal breakdown of the materials. So the standard require oil breakdown voltage in VB > = 25 kv / 2.5 m

Specimen thickness effect on the dielectric strength, thickness and dielectric strength is not a linear relationship, usually the same material under different thickness measured dielectric strength is different, the thicker specimen measured slightly lower dielectric strength. Humidity impact: the resistance caused by the moisture in material to reduce, will reduce the breakdown voltage value.

Electrode chamfering: the influence of electric field intensity is much higher than the internal electrode edge and edge effect but very difficult to eliminate. In order to avoid the electrode edge into a right Angle, it is necessary to adopt certain chamfering r. Specified in the national standard r = 2.50 mm.

Materials under the effect of electric field, the initial material per unit time when internal heat is greater than the heat coming out of the medium, and medium temperature, temperature increase is a from fast to slow, slower if booster material breakdown happened at last larger thermal breakdown of the components.

More action time of impact due to heat accumulation and the breakdown voltage value decline with the increase of voltage effect time, thermal breakdown in the form of samples, basically breakdown strength also increase. The increase of pressure rise speed Therefore, general provisions sample breakdown voltage is lower than 20 kv booster when speed is 1.0 kv/s; Greater than or equal to 20 kv booster when speed is 2.0 kv/s. The effect of temperature: the temperature increase general dielectric strength reduced.

Tech support: Beijing all fine instrument equipment co., LTD