Study Of Interface Electric Trace Damage Regular Based On Discharge Light Signal

The cross-linked polyethylene table is largely used in the power transmission anddistribution network as its excellent electric property and mechanical behavior. Thefailure of the network often occurs at cable joint. It is a dielectric breakdownphenomena occurring at the interface between XLPE and silicon rubber. It is veryimportant to study the mechanism of fracture and discharging regular pattern.The discharge light is often found when discharging occur at interface. Thecarbonization at the interface after discharge occurring is conductor. The dischargelight and carbonization is the characteristic scalar to describe the interface insulationstate. This paper studies the reason for the interface insulation breakdown andcarbonization formative. It devise experiment platform. First, it collects dischargelight and carbonization pictures. Second, it uses the method of the image processingand the fractal dimension to study the pictures. Third, it analyses the characteristic ofthe distributive of the discharge light and the carbonization. Obtained results showthat the distributive of the discharge light is influenced by the distributive of thecarbonization.The discharging at interface is caused by electric-field strength. The dischargingoften occurs in the high electric-field area due to the asymmetry distribution of theelectric-field resulting in the part high electric-field. The distribution and lightintensity of the discharge light are closely related with the electric-field strength. Theelectron can strike molecule to produce electric charge. The photon can escape frompositive charge and negative charge compositing. The strengthener the part highelectric-field is, the larger the number of the photon is. It can be obtained for thedistribution of the electric-field by means of measuring the discharge lightdistribution.Carbonization can be found at interface after discharging. It can change thedistribution of the electric-field. The area with carbonization can weaken. The othercan strengthen. The number of photon can increase as the high electric-fieldstrengthener. The thin air gap can be found around carbonization. The electric-fieldcan be strengthener in the thin air gap due to the dielectric constant of the XLPE islarger than the air gap. Discharging can be formed in the air gap.The pressure and the silicone grease distribution can alter during the cable joint working. This paper designs a test-bed to study the phenomenon. The result show thatthe interface insulating property can be more strengthen by the pressure and thesilicone grease. The position of the discharge gallery is fixed after discharging.