Optimization Design on Shielding Electrodes for PLC Reactor in UHV Indoor DC yard

PLC (Power Line Carrier) reactor is a tower-type filter equipment in indoor DC yard consisting of segmental grading ring, supporting insulators, flange, winding coil and so on. Comparing with outside DC yard, indoor DC yard has stricter requirements to uniform electric field for shielding device, due to the compact layout of filter equipment and grounding potential of roof and wall. So, it is necessary to analyze the characteristic of potential and electric field distribution of grading ring of PLC reactor. In this paper, an original ±1100kV indoor DC yard model is built and analyzed with finite element method. The parametric modeling method is used to calculate the surface electric field distribution on the surface of PLC reactor with different structure parameters of grading ring. According to the calculation results, the structure parameters were adjusted and adopted spindle-type arrangement of grading ring. After the optimization, the maximum surface field strength of the grading ring meet the control value 1.2kV/mm. The calculation results could provide valuable references for the design of UHVDC PLC reactor.