Relay and transformer protection method and system protection transformer having the same

摘要

Protection relay transformer (60) to protect a transformer (10) in a system in which the transformer (10) comprising a primary port and a secondary port is connected between a primary current transformer (20) and a transformer sidestream (30), the relay (60): a control module (63); and an input module (61) configured to input to the control module (63) having a voltage ratio transformer (10) and a current ratio between the primary current transformer (20) and the transformer secondary current (30) established by a user, the ratio of current indicative of a relationship between an input current transformer (10) and an output current transformer (10), wherein the control module (63) is configured to determine, in advance to avoid a malfunction of the protection relay transformer (60) when the system is operated, if the protection relay transformer (60) is correctly set by the user or not, calculating the value of a parameter K based on the following formula: formula ** ** wherein V1 is a primary voltage on the primary port of the transformer (10), V2 is a secondary voltage in the secondary port trans forming (10), I1 is the input current to the primary port of the transformer (10), and I2 is the output current leaving the secondary port of the transformer (10), and wherein the control module (63) is configured to determine that the transformer protection relay (60) is incorrectly set by the user when the K value is outside a predetermined range.