Compensation Scheme for Single-Pole Switching on Untransposed Transmission Lines

A Modified Four-Legged Reactor Scheme was developed for high speed, single-pole reclosing on untransposed lines. The new scheme, together with the simple four-legged reactor bank, effectively reduces the secondary arc current and the recovery voltage. Equations were derived to determine optimum neutral reactor values. Efficiency of the compensation scheme and the optimization procedure were verified by an example. The modified four-legged reactor bank includes four switches whose operations are coordinated with the line breakers. Switch parameters and suggestions for neutral reactor protection are given.