Description：
Lightning: Transformer damaged by lightning strike, which is the mainly reason and occupied in 50% during the accident of damage . Faulty Arc ：Mechanism of faulty arc :1 the insulated tie (oil and solid) punctured by over-voltage and faulty arc occurs.2 energy transmission between oil and arc , which lead to temperature increasing surround arc At the same time , the oil in transformers vapour and became flammability gas in the form of plasma .3 with the increasing of pressure of bubble surround arc, a very concentrated partial phase change and prevention of expansion of gas by oil in transformer , they make the balance of pressure between gas and fluid.4 the wave of pressure created by pressure difference between gas and fluid ,transmits from arc to whole oil tank in speed of sou...
Description：
Lightning : solar energy and wind energy characterized as new energy, play an every important role in the development of energy and power industry . unfortunately the fan of wind system and the panel in solar system are easily attacked by the lightning.those devices of system will be damaged by the ground attack by the lightning strike directly or indirectly . Faulty Arc : there are some reasons such as joint loosening, bad connection , dampness wire, and rupture of insulation layer , those of all can create the faulty arc . Harmonic and three phase unbalance：Iron core with ferromagnetic saturation characteristics such as transformer ,and power electronic components based on the switching power supply equipment such as inverter, existed in the system of new energy . so that there...
Description：
Lightning: Oil&gas and petroleum industry characterized by traits such as flammability and explosive. So that the safety of electric and lightning protection are necessary for them . Reason :1 metal equipment and instruments including react power, frame , tank , instrument , pipeline, good conductor and cable are good conductor .2 Flammable and explosive semi-product and product placed in Production equipment on condition of high temperature and high pressure .3 Electronic equipment as DCS , UPS , PLC etc widely used in process of production, in that , integrated circuit is easily attacked by lightning. And it can’t afford the electrostatic voltage, specially for big scale modular equipment during the lightning strike . Arc fault : arc , electric spark , electricity leak,shor...
Description：
CFaulty arc: when welding machine and welding robot working , the faulty arc takes place in the circuit of power supply and disturb the power quality. meanwhile , arc with high heating energy often lead to fire accident.Harmonic and three phase unbalance : harmonic and three phase unbalance are existed in processing steps of stamping , welding , coating , assembling. Automotive industry need have a excellent power supply to maintain the process of production . it often being at risk of being interfered by poor quality power such as unstable ,harmonic , resonance and reactive power, also make equipment overheat and communication interference. 1 Stamping : automotive industry require the electrical or thermal conductivity of beryllium copper in areas such as many alloys with...
Description：
Lightning: Elevated line of rail transit is often easily attacked by lightning. And the cable transmission , steel structure , weak equipment ,and communication system are harmed by it.Faulty Arc: in the train , faulty arc caused by bad connection on the place of power supply cable , wring terminal ,and electrical components . faulty arc with high heating energy often leads to fire accident. Harmonic and three phase unbalance: 1 The rail transit power supply system is affected by the harmonics , which caused by the rectifier in the traction substation . in the rectifying device , there is the current AC formed rectangular wave. Power frequency and a high harmonic current create a synthesized waveform . and is an odd multiple of the fundamental frequency of the power . 2 The non...