PROBLEM TO BE SOLVED: To provide a protection relay which can further easily grasp a failure phenomenon by performing a normal protection operation without causing an unnecessary protection operation.SOLUTION: A protection relay comprises a protection region settling circuit for settling a G-B region which detects a failure by an admittance value of an AC-feeding circuit, and a change rate detection circuit which detects a rise of a change rate of the admittance value to a set value or larger. The protection relay also comprises an AND-gate which outputs an operation output to the relay when the admittance value is transited to the outside of the G-B region, or when the change rate of the admittance value reaches the set value or larger.SELECTED DRAWING: Figure 1
【課題】不要な保護動作を起こすことなく、正常な保護動作を行うことで、故障現象をより把握しやすくせしめる保護継電器を提供する。【解決手段】交流き電回路のアドミッタンス値により故障検出を行うG−B領域を整定する保護領域整定回路と、前記アドミッタンス値の変化率が設定値以上に上昇したことを検出する変化率検出回路とを備え、前記アドミッタンス値が前記G−B領域の外へ移行する、あるいは前記アドミッタンス値の変化率が設定値以上になったときに動作出力をリレーへ出力するアンドゲートとを備える。【選択図】図1
PROTECTION RELAY
保護継電器
2017-05-18
Patent
Elektronische Ressource
Japanisch
Relay protection circuit, generator and generator relay protection method
Europäisches Patentamt | 2021
|