电力系统振荡时，阻抗继电器误动作，原因是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69011' and id < 4466736 and id<>'4466736' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69011' and id > 4466736 and id<>'4466736' order by id asc limit 5