That means local overheating, arcing, decom-position of oil and release of gas. 1.1. 15.2 is self-protected. ��8�l��b5&��\���O8��@��_V¨�iG&7ӴÓ�L;"Y�*�K�D�LBK�\��,�D4z0͞�'�7�{��X�_YFPs��=���j�1��V,��a�y+XB�랬��\Χ��zxD����M켔��4=x����j/+bΩ��`K`!�Po���#Ζ�K8��f�2 %PDF-1.7 For transformers 10 MVA and above (Category III & IV) ,differential relay are commonly used to protect them. 718 0 obj <>stream Selection Guide ABB’s liquid filled Power Distribution Transformers range from 16 kVA upwards, with primary voltages up to 72.5 kV. 0000001722 00000 n 0000003140 00000 n �*�$�n�UU2]��T&���7����R.�tV��1����X� endobj 1 0 obj trailer 0000038325 00000 n 0000004936 00000 n 0000058817 00000 n Distribution power transformers can be Failure of distribution transformers causes capital loss and loss of revenue to the nation. 0000038574 00000 n %%EOF Few of them are mentioned below. In the case of a fault within the power transformer it is important to minimize tripping time in order to decrease the impact of thermal stress and electrodynamic forces. A gas detector relay therefore detects a turn-to- … used for a wide variety of applications. 0000007880 00000 n Principles are emphasized. distribution transformers[2]-[4]. RET615 is a member of ABB’s Relion® product family and part of its 615 �Z�p�Go�1�1��JM�����pD�`4'B�Q(�p���Uk�pGW ��a�>��q� o���)w�hL��#^}*�O*A��M���� ���FԖH�f%���kP 0000029510 00000 n 0000003218 00000 n In India the maximum distribution transformer is damaged due to overloading, but still there is no any smart protection is applied for it due to its high cost. 1.2. 4 0 obj Time at 50% of the maximum per-unit through fault current = 8 seconds. endobj d�_ef���#r�A�Ù���$M�t������ݳQ+v哣��j+jH0��.�m�+Hz���'��a����)6�� Q:���3����Q��$4��yMTef���ޱ�q��㼒�&�]��x��Е0)��Q�K���-s��J g1l�Qlv��}Q�����*3CB�Yc��fqI��G-@�NxH�0l�8T�jP�x���w��{����fjٖ���w �(���~�C];N%7;���N�~~}�s�3:y�p�ɴ���tu�m�+��j=���N�[��ȹ�1'�q�!�o;&�̹�E �)��1c���k�I�?�#G�j�ە�jY�zg7D��8��g������G9;y$�/8���=N9x�(8!a������1)��ǚ�*��. %���� 3 0 obj 0000003846 00000 n /� <<5C8EB33191BAB04D8050DB7590AD2B18>]>> 0 endobj A new protection method against Very Fast Transients (VFT) in the form of a series connected choke and its practical implementation for protecting distribution transformer is presented. Transformer Protection Application Guide This guide focuses primarily on application of protective relays for the protection of power transformers, with an emphasis on the most prevalent protection schemes and transformers. 0000003979 00000 n x�b```b``�``e``ga`@ 6v�n&V�F�1��|�)�wko�d5�^T|.�)��۷�)�o��LLR�À ASS Relays Power transformer protection AGO3-5005 E Page 6 The current in the short-circuited turns may be 50-100 times the rated current. 0000002254 00000 n endobj This specification applies to three-phase, 50-60 Hz, fully dead front, [select: pad-mounted distribution; substation] transformers. <> Power transformer protection varies with the application and transformer importance. endobj (1) Ordinary transformer measurement system generally detects a single transformer parameter, such as power, current, voltage, and phase. The ability of the 0000038787 00000 n �-`i�j(cx�����=��}�1���� @ЀEi�,T����l��$Q���M@���) �BF!ecc��͂��PW4 ,RC2������NB���J�@�-�׷ia .�Ve�g4`��� ���0��Ђ�3�V,��֘ԐŰa�sW{ ��A�7� �iJ@��L\�w&0 0000002708 00000 n The transformer primary 0000000772 00000 n 4 0 obj 0000005186 00000 n 696 23 kYWsQT~��F��8�E��;�y�u���5��ԧ0�>�:q$=�}M/�r�B(.|�z�۲��t ����Pu�b�e6�cӪ2�:�]㪷�ern/۰���+)1��n�ժ�1�A�҂^P��NV��H����Uһ}�nm��W&/�[c����ј��'G���#v���f��E�y ������|���ь�!,��5~��q��d6ϫ��c��)���������yY�. ]�Y.w� It is equipped with a lightning arrester, a weak-link or protective-link expulsion-type fuse (installed under oil in the trans-former tank), a secondary circuit breaker, and a warning light. Dog leg curve - 10 times base current at 2 seconds. ABB supplies the widest range of power distribution transformers, including specific designs for power centres, substations, networks and padmounts. transformers up to 1000 kVA (distribution transformers for 11kV and 33kV). stream Current differential relays are applied for transformers as main protection. 0000059069 00000 n One other advantage of newly designed Protection system of transformer is it having inbuilt thermal overload protection in distribution transformer. thermal overload. <> 4 RET615 TRANSFORMER PROTECTION AND CONTROL 1. x�bbb�������8J� �q�h���(1� ��8�烅 0 N�� <> 0000002841 00000 n 3 0 obj 2 0 obj Transformer performs a great job in the power system to change voltage and current level so proper protection for the transformer is important to maintain reliability in the system. 0000002443 00000 n The monitoring devices or systems which are presently used for monitoring distribution transformer exist some problems and deficiencies. startxref endstream endobj 697 0 obj <>/Outlines 228 0 R/Metadata 263 0 R/PieceInfo<>>>/Pages 260 0 R/PageLayout/OneColumn/OCProperties<>/OCGs[698 0 R]>>/StructTreeRoot 265 0 R/Type/Catalog/LastModified(D:20080504213056)/PageLabels 258 0 R>> endobj 698 0 obj <. <>>> than 5) through-faults over the life of a transformer serving overhead feeders. stream <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> ��,�E� @�@� protection used depends on the system element being protected and the system voltage level, and, even though there are no specific standards for the overall protection of distribution networks, some general indication of how these systems work can be made. �U��/ߧ�+���M��a�iR�P���]�—k^���L�B�G�.��v�^���q]n���[޻�|$�2VQd�@n���|����^��=�V 0����G)���'`���W��>. With the increasing loads, voltages and short-circuit duty of the distribution substation feeders, distribution over current protection has become more important today than it was even 10 years ago.