FIELD: electricity.
SUBSTANCE: surges of short circuits current are recorded and time between them is measured; at that since moment of short-circuit current surge occurrence at the first transformer delay time countdown is started for protection operation of the first bus section disconnect switch and if short-circuit current disappears when delay time is over then the fact of failure is stated for the first bus section neighbouring with disconnect switch, which is supplied from the first transformer and automatic reclosing of the first bus section disconnect switch is prohibited. If short-circuit current surge occurs at the second transformer, then since the moment of its occurrence delay time countdown is started for protection operation of the second bus section disconnect switch and if short-circuit current disappears when delay time is over then the fact of failure is stated for second bus section neighbouring with disconnect switch and automatic reclosing of the second bus section disconnect switch is prohibited.
EFFECT: functionality enhancement.
2 dwg
