Switchgear Partial Discharge Ultrasonic Detection Technology And TEV Analysis And Field Application

In our substation,35 KV or 35 KV voltage switch equipment is usually used,so whether these voltage devices can work properly determines the safety and efficiency of power supply in our country.After a long period of work,the electrical equipment will become hot,the power supply efficiency will be reduced,and the insulation strength will be weakened,which will lead to the partial discharge of the electrical equipment,and may eventually cause damage to the equipment and can not supply power properly.In recent years,a number of electrical equipment has been partially discharged,leading to casualties and damage to power supply equipment.To prevent this failure from occurring again,it is important to study partial discharge.All along,the industry is to take preventive principles,regular,regular equipment for partial discharge testing.Although this method reduces the partial discharge to a great extent,there are still some shortcomings.The problem is that the interval between the two checks is too long,and the machine is likely to produce partial discharge faults at the intervals of the two checks,resulting in damage to the machine.Therefore,it is necessary to use better detection measures to prevent the partial discharge of equipment.Transient voltage and ultrasonic are two new methods of discharge detection.This paper first explains the reasons for the discharge of the switch box,and introduces several forms of the discharge,and then explains the concepts of transient earth voltage and ultrasonic discharge detection.Two kinds of inspection measures are discussed in detail from the following aspects: inspection process,inspection,test data analysis,defect diagnosis and inspection test.With its solid high voltage switchgear maintenance experience,selects several thorough analysis in the usual common phenomenon.It is pointed out that different method for detecting accuracy and limitations of different types of PD,and pointed out by the combination of TEV and ultrasonic acoustic electric combined positioning method,has a high positioning accuracy to determine the PD,and found a lot of problems to solve.Finally,some points of view on the discharge of high voltage switchgear are put forward.