Modelling and Validation of the Magnetizing Curve to Represent Saturated Core Reactor Using ATP Simulator

Abstract

This  paper  is  focused  on  the  proposal  and validation  of  a  procedure  to obtain  the  necessary  data  to  model the magnetization curve of saturated core reactors as required for the   voltage   regulator   device   constituted   by   a   parallel combination of an inductive saturated unit and a fixed capacitor bank.  The  methodology  to  model  the  nonlinear  device  is  based on  constructive  parameters  and  information  associated  to  the type of magnetic material utilized to build up the equipment. The results  are  expressed  in  terms  of  the  relationship  between  the core  flux  and  current  values  which  are  used  to  feed  the ATPDraw  time  domain  simulator.  Computational  studies  are then  carried  out  to  find  the  reactive  power  absorbed  by  the reactor  as  a  function  of  the  applied  voltage,  and  the  theoretical results are compared to three prototypes having different ratings. The    experimental    results    derived    from    7kVAr-0.22kV, 600kVAr-13.8kV and 3MVAr-34.5kV products are then utilized to  validate  the  saturation  curve  ATP  representation  through  a comparative  performance  analysis  of  the  absorbed  reactive power with the voltage variation.