Research on Mechanism and Eliminstion of Ferroresonance in Distribution Networks

Ferroresonance over-voltage is an internal over-voltage distribution network often . In order to monitor the power generation and substation bus voltage to ground , usually in the bus connected voltage transformers, voltage transformers , the primary winding received more star neutral point directly to ground . The voltage transformer the excitation impedance and system capacitance to ground of the non-linear resonant circuit is formed . Different circuit parameters and external excitation conditions , may produce a divide- and -frequency or high-frequency ferroresonance . Over-voltage and over-current resonance , seriously affecting the operation of the system security . Therefore fully understand the mechanism of ferromagnetic resonance , ferromagnetic resonance overvoltage model simulation is particularly important . 35kV and 10kV system based on MATLAB simulation platform , the establishment of a model of electromagnetic voltage transformer neutral point grounding system ferroresonance 35kV and 10kV distribution network model . During the simulation , the PT module MATLAB platform simulation experiments to get good results . The simulation of actual line simplification and related harmonic elimination measures . Verify the the 4PT wiring can suppress the occurrence of ferroresonance good . Made subject appear a Power Bureau the Shiqiaopu station and the new soap station the PT high pressure side fuse blown . Suppress the ferromagnetic resonance , the current low-frequency low-frequency resonance caused by ferromagnetic resonance oversaturated and verified 4PT wiring inhibition overcurrent and overvoltage .