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. Failure of distribution transformers causes capital loss and loss of revenue to the nation. than 5) through-faults over the life of a transformer serving overhead feeders. 718 0 obj <>stream �;@�p7�:zx�&g4��������� ����/��%�ln���4����8��wڮ��-tz) RET615 is a member of ABB’s Relion® product family and part of its 615 endobj kYWsQT~��F��8�E��;�y�u���5��ԧ0�>�:q$=�}M/�r�B(.|�z�۲��t xref �Z�p�Go�1�1��JM�����pD�`4'B�Q(�p���Uk�pGW ��a�>��q� o���)w�hL��#^}*�O*A��M���� ���FԖH�f%���kP stream 0 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. 696 0 obj <> endobj 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. x�bbb�������8J� �q�h���(1� ��8�烅 0 N�� 0000058817 00000 n 0000038787 00000 n 0000002254 00000 n <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> ��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 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. ]�Y.w� endobj �� �B�S?� �`���eP��29��] �6�2p��`Y0W�e �x���0 HK20pVㆉ��D�l`p �,������i)���Jms�.���gk����/�| ur0���E/ !�G� 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 <. That means local overheating, arcing, decom-position of oil and release of gas. endobj Current differential relays are applied for transformers as main protection. Few of them are mentioned below. Dog leg curve - 10 times base current at 2 seconds. 0000002443 00000 n Distribution power transformers can be 0000002708 00000 n �S��J�0 ��C>O��S�Yo��u 0000005186 00000 n 0000003218 00000 n %PDF-1.5 <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 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. 1.1. 1 0 obj 0000038325 00000 n 0000001722 00000 n 4 RET615 TRANSFORMER PROTECTION AND CONTROL 1. Small distribution transformers for pole mounting. In regard to backup %PDF-1.4 %���� <> 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. used for a wide variety of applications. 3 0 obj One other advantage of newly designed Protection system of transformer is it having inbuilt thermal overload protection in distribution transformer. %%EOF �-`i�j(cx�����=��}�1���� 0000002841 00000 n 1.2. thermal overload. /� 2 0 obj 2.1 Maintenance of distribution transformers 2.2 Transformer protection 2.3 Protection of the transformer against faults occurring in the system 2.4 Short-circuits 2.5 High-voltage, high-frequency disturbances 2.6 Surge protection of transformers (1) Ordinary transformer measurement system generally detects a single transformer parameter, such as power, current, voltage, and phase. x�b```b``�``e``ga`@ 6v�n&V�F�1��|�)�wko�d5�^T|.�)��۷�)�o��LLR�À 4 0 obj transformers up to 1000 kVA (distribution transformers for 11kV and 33kV). Main curve - 25 times base current at 2 seconds. endobj endobj 1 0 obj <>/Metadata 6159 0 R/ViewerPreferences 6160 0 R>> A gas detector relay therefore detects a turn-to- … �U��/ߧ�+���M��a�iR�P���]�—k^���L�B�G�.��v�^���q]n���[޻�|$�2VQd�@n���|����^��=�V 0����G)���'`���W��>.

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