Aiming at studying the inner electric field distribution of the operating cable joint and improving the performance of the insulation

the simulation research of electric field and temperature field of the power cable joint is carried out.On the basis of analysis of the inner thermal sources of cable joint

the formula which is based on distributed capacitance is deduced from the basic formula of dielectric loss

which is used for analyzing the coupling relationship between the electric field and temperature field.The electric and temperature field of the 110kV power cable joint is simulated by ANSYS software and the different distribution characteristics of the fields when the 110kV cable joint in various conditions such as normal condition

aged condition

or containing impure matters are analyzed.The studies show that in some cases

the aged insulation and the existence of the impure matter can cause the joint temperature increase

which could make the distribution characteristic of the inner electric field of the operating joint deviate from that of design.Under some worse conditions

it can result in thermal or electric breakdown of the products.