as the S&P 500 slipped toward the threshold that would trigger an initial “circuit breaker.” The S&P 500 SPX was down 4.6% near 4,200 in recent trade, after hitting a session low at 5,115.27 ...

Transient voltages and currents are caused by sudden changes within the electric power system. Opening or closing of a switch or circuit breaker causes a change in circuit configuration and the ...