Flexible Rogowski Coil And Its Application On Monitoring Of Electrical Equipment Insulation

In recent years, with the increasing voltage level of power system and the increase in capacity, The requirements of insulation performance for electrical equipment is more stronger, Electrical equipment insulation is good or bad, will directly affect the power system whether normal operation, So for electrical equipment insulation detection is particularly important, For electrical equipment insulation detection can timely find the defect of the operation electrical equipment, Timely treatment and prevent unnecessary loss caused by power outages, Transformer in insulation testing is an indispensable measuring equipment, The traditional electromagnetic current transformer exposed many defects, such as flammable and explosive, secondary side can’t open, measurement range small and band narrow, etc. And because of its electronic current transformer has the traditional electromagnetic current transformer do not have advantages, such as good insulating property, the price is low, no saturation, wide measurement range, wide frequency band and so on, it has become the first choice of renewal the traditional electronic current transformer.In this paper, introduce the working principle of the flexible Rogowski coil, Characteristics of structure and analysis of the working state, Discussed the flexible coil production process defects and the requirements of make ideal coil, According to the flexible coil can’t batch production or meet the structure of the component characteristics, this paper puts forward to PCB board type Rogowski coil design, based on the printed circuit board design new structure of the coil, its structure is simple and have good anti-interference ability, Rogowski coil used to measurement of signal output is the differential signal, need integrator for its reduction, by comparing the advantages and disadvantages of the analog integrator, digital integrator and electronic chip combined integrator, at last for the type of the electronic chip integrator design, it succeeded in the realization of the integral function. The type of can be move PCB Rogowski coil to solve the defects of the flexible coil production process and structure bring error. Finally use the design of PCB board type Rogowski coil and integrator measurement the charged conductor and electrical equipment insulation testing, the results ideal, it can satisfy the requirements of0.5%measure precision.