directional relay การใช้

• Directional relays and power relays with two input energizing quantities
• Electrical relays . part 12 : directional relays and power relays with two input energizing quantities
• The chongqing electric power load system was set up in 1992 , and by 1996 , a control center composed by novell network , six bi - directional relay transmit stations , 2 unilateral transmit stations and 1260 diversified terminals have been established , which covered areas managed by the former electric power bureau of chongqing . the system scope of the established electric power system was on the top place among the large and middle cities over the country
• Abstract : there are only two set values ( 30 , 45 ) for interior angle of the stimulated directional power relay as the protection in phase to phase short circuit fault . an accurate setting formula for interior angle of the microprocessor - based directional power relay as the protection in phase to phase short - circuit fault is proposed and analyzed , users can set as a calculation value or at least an optimum in the formula . therefore the operation sensitivity and reliability of the directional relay would be improved greatly . the opinion is new and practical