H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 3/00 (2006.01) G01R 23/02 (2006.01) H02H 1/00 (2006.01) H02H 1/04 (2006.01) H02H 3/12 (2006.01)
Patent
CA 2452378
The system (10) obtains the three phase voltages on the power line VA, VB and VC, either from a local primary (14) or local alternative source (16). The selected local source voltages (14, 16) are then applied through switches (20, 28), respectively, which are normally closed but are open in the event that the associated pole of each voltage phase is open. The voltages from the closed switches (20, 28) are applied to a calculating circuit (40) which produces a composite of the three voltages in accordance with a preselected formula. The composite voltage output is then normalized (44) and applied to a conventional frequency determination (estimating) circuit (46). This output (FREQ. OUTPUT) is an accurate system frequency for use by the protective relay.
Le système (10) obtient des tensions de trois phases dans la ligne de transport de force V¿A?, V¿B? et V¿C?, à partir d'une source locale primaire (14) ou d'une source locale primaire alternative (16). Les tensions de source locale (14, 16) sont ensuite appliquées à travers des commutateurs (20, 28), respectivement, qui sont normalement fermés mais sont ouverts s'il se trouve que le pole associé de chaque phase de tension est ouvert. Les tensions des commutateurs fermés (20, 28) sont appliquées à un circuit de calcul (40) qui produit un composé des trois tensions conformément à la formule présélectionnée. La sortie de tension composite est ensuite normalisée (44) et appliquée à un circuit conventionnel de détermination (d'estimation) de fréquence (46). Cette sortie (FREQ. OUTPUT) constitue une fréquence de système précise pouvant être utilisée par le relais de protection.
Benmouyal Gabriel
Guzman-Casillas Armando
Benmouyal Gabriel
Ridout & Maybee Llp
Schweitzer Engineering Laboratories Inc.
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