چکیده مقاله
Relays play an important role in protection systems Properly working protection devices result in clearing a fault or decreasing the effect of disturbances on power system The maloperation of relays can inversely worsen the problem and even deteriorate system stability Several cases of abnormal maloperation of the transformer differential protection are reported, which occurs when a type of transient current, such as lightning, is applied to the transformer involved power systems In order to ensure reliable operation, dynamic test as one of the most important test methods for evaluation of protection relays performance has been utilized With today’s modern test equipment, power system real conditions can easily be simulated By making a profile of the operation of the scheme, malfunctions can be foundfaster because it is easier to identify the changes in areas that don t operate the way they are expected The purpose of Dynamic test is to understand the accuracy of protection relay in critical conditions To reach the point, the survey has been done in a MiCOM P632 differential protection under a real current fault created by a powerful lightning current which happened to a high voltage station of BREC The relay causes a 230/63KV power transformer to be tripped wrongly In order to analyze the event, the test has been done by Vebko AMT105 in transient mode Finally, applying a comtrade file of the fault to Siemens 7UT613, has confir med the maloperation of MiCOM P632 differential relay
کلیدواژهها
نویسندگان
Mahmoud Hasani
Bakhtar Regional Electric Company
Rouhallah Davoud abadi
Bakhtar Regional Electric Company
Jafar Nosratian Ahour
Bakhtar Regional Electric Company
شیوه ارجاع
Hasani, Mahmoud and Davoud abadi, Rouhallah and Nosratian Ahour, Jafar,1398,Dynamic relay testing to evaluate Differential protection malfunctions,Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy,Tehran
ارائهشده در
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