Research On Self-powered Technologies For Transformer Insulation Online Monitoring Sensor

With the rapid development of economy,the scale of the power system has been growed continuously.Especially after the construction of the smart grid,the requirements for the safety and reliability of the power system operation are getting higher and higher.Power transformer is one of core devices for power transmission and conversion in power systems.It will have a tremendous impact on social economy and people's lives.In order to monitoring the status of power transformer in real time,more and more monitoring devices are put into using,but stable and reliable power supply is the key to the effective operation of these devices.In this paper,we summarize the existing online power supply technology.According to the advantages and disadvantages of various energy supply methods,the inductive power supply is proposed.The current sensing energy supply coil is a current sensor that measuring high frequency signal.A separation circuit of a high frequency signal and a power frequency signal is designed to reduce the influence of the power frequency induced voltage on the high frequency measurement signal.Due to the low number of sensors in the measurement of high-frequency signals and the lower output voltage of the industrial frequency sensing,a voltage doubler rectifier circuit and an LC ?-type filter circuit are designed for this problem.In order to achieve the operating voltage of the on-line monitoring equipment,based on MAX5897 and LTC3108 designed positive and negative voltage DC-DC voltage regulate circuit.Using Multisim software to simulate the design circuits,the feasibility of the designed circuit was verified.Build an experimental platform in the laboratory to test the designed solution,basically meeting the expected requirements.When the power supply equipment is an active amplification filter with a power consumption of 0.059W,the working starting current is 118A.The starting current is so big,For this problem,microwave energy supply and solar panels are proposed and designed as auxiliary power supply methods.To prevent There are various types of energy supply circuits that have voltage disturbances.