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江苏春晨电缆有限公司
江苏春晨电缆有限公司
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江苏春晨电缆有限公司专业生产EV-VV 充电桩电缆，聚氯乙烯绝缘聚氯乙烯护套电动汽车传导充电系统用电缆 ，
进入公司商铺 江苏春晨电缆有限公司专业生产EV-VV 充电桩电缆，聚氯乙烯绝缘聚氯乙烯护套电动汽车传导充电系统用电缆 ，
Firstly, under the DC voltage, the positive and negative corona electrodes gather the space charge near the tip electrode. In negative corona, when the electron impact ionization, electron is to drive away from the tip electrode space, and the formation of negative ions near the electrode surface gather odd-n ions, continue to strengthen the electric field, the positive ion is sucked into the electrode, at a pulse current, negative ion diffusion into the interstitial space. And then the next ionization and charged particle motion. So much so that there is a lot of pulse current. If the voltage continues to rise, the pulse frequency of corona current increases, increases into of glow discharge, voltage rise, negative streamer discharge, because its shape is also called plume discharge or brush discharge.
When the negative streamer discharge to continue to develop to the opposite electrode, will cause the spark discharge, the gap breakdown. Positive corona is the distribution of positive ions on the electrode tip near, but has been to space and electron repulsion, is sucked into the same electrode, repeat the formation of current pulse corona. The voltage continues to rise, emergence of streamer discharge and can lead to breakdown.
电晕放电的特征是伴有"嘶嘶"的响声，有时有微弱的辉光，当导体表面上有很小的*存在时，就会生电晕放电。电晕放电可能指向其他物体也可能不指向某一特定方向。电晕放电时，*附近的电场强度很强，*附近气体被电离，电荷可以离开导体;而远离*处场强急剧减弱，电离不*，因而只能建立起微小的电流。电晕放电的特征是伴"嘶嘶"的响声，有时有微弱的辉光。电晕放电可以是连续放电，也可以是连续脉冲放电，电晕放电的能量密度远小于火花放电的能量密度。在某些情况下，如果升高*导体的电位，电晕会发展成为通向另一物体的火花。 成品检验耐压试验时，一定将导体部位插入铜接头里，拧紧固定螺丝，使其牢牢固定于电缆头部，用棉布醮取*将绝缘外露部分仔细擦净，如果导体和高压部位接触不好也导致*电晕放电。在三根绝缘线芯做高压试验时，一定将绝缘介质分离开，防止电晕相互放电，在剥头时严格按照操作规程，用刨刀从电缆端部向里剥削半导电屏蔽层，剥取绝缘及导体屏蔽，剥削长度8.7/15KV及以下大于15cm，12/20KV~20/35KV为大于20cm，剥离厚度要求以刚好剥去绝缘半导电屏蔽层为宜，注意zui后收刀动作，根部应圆整，不准有尖角，剥离后的绝缘部分不允许有较深的刀痕或黑色半导电屏蔽层残屑。使用大终端时剥取绝缘和导
体屏蔽应使导体露出5cm为宜，小终端仅需剥去外屏蔽，表面不准有任何*。EV-VV 充电桩电缆
Corona discharge is characterized by a "hiss" sound, sometimes a faint glow, when the conductor surface has a very small tip, there will be a corona discharge. Corona discharge may point to other objects may not point to a specific direction. The corona discharge, the electric field strength near the tip of a strong, near the tip of the gas is ionized, the charge can leave the conductor; and away from the tip field of a sharp weakening of ionization is not complete, so we can only establish small currents. Corona discharge is characterized by a "hissing" sound and sometimes a faint glow. Corona discharge can be continuous discharge or continuous pulse discharge, and the energy density of corona discharge is much less than that of spark discharge. In some cases, if the potential of the tip conductor is increased, the corona will develop into a spark to another object. Test pressure test finished, a conductor copper joint parts insert, tighten the screws, which is firmly fixed on the cable head, the exposed part of the insulation carefully wipe with cotton dipped in anhydrous alcohol, if contact conductor and the high pressure part has not lead to corona discharge. Do pressure test in three insulating wire cores, a dielectric material is separated from each other to prevent corona discharge, the stripping head in strict accordance with the rules, from the end of the cable to use planes in the exploitation of semi conductive shielding layer, stripping insulation and conductor shielding, and the exploitation of the length of 8.7/15KV is greater than 15cm, 12/20KV~20/35KV more than 20cm, with just stripped insulated semi conductive shielding layer is suitable for stripping thickness requirements, pay attention to the final closing action, the root should be round, no sharp corners, insulating part is not allowed to have deep black marks or semi conductive shielding layer of debris after stripping. The use of large terminal stripping insulation and conductor shielding should make the conductor exposed to 5cm is appropriate, the small terminal only need to be stripped off the surface, the surface is not allowed to have any tip.
发生电晕,对于高电压电气设备，会逐渐破坏设备绝缘性能,电晕放电的空间电荷在一定条件下又有提高间隙击穿强度的作用。在做耐压试验时，要加强防范措施，防止电晕放电的发生，提高成品检验效率。
Corona, for high voltage electrical equipment, will gradually destroy the insulation performance of the device, the corona discharge space charge under certain conditions and improve the gap breakdown strength. In the pressure test, we should strengthen the preventive measures to prevent the occurrence of corona discharge, improve the efficiency of product inspection.
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