diesel engine over-speed relay
induction-ring type high-speed relay
electrodynamic type high speed impedance relay
high speed directional overcurrent relay
high speed distance relay
high speed step-out relay
high-speed impedance relay
multi-zone high-speed distance relay
Conversion speed speed -governing
base speed of an adjustable-speed motor
fast-speed (high-speed) railway
HIGH SPEED AND SUPER-HIGH SPEED GRINDING
high-speed cruise speed