The most common oils include sunflower, safflower, and soybean oil. Your email address will not be published. Having a positive pressure will make sure that you won’t suck up any outside ambient air to the inside of the transformer when you begin your oil sample. Specific Gravity, 60/60 D1298, D4052 0.910 max Viscosity, Kinematic, mm2/s 100°C 40°C 0°C i D445 3.0 11.0 76.0 Inside the transformer, it works like a liquid insulation, helping with reduced clearances, and then for cooling and carrying heat from the windings and dissipating it through the tank body and Radiators. properties to avoid flash over. We are based in the Washington, DC Metropolitan Area and are prepared to respond to any electrical emergency or need you may have. � eb�M�e�գS�f"v�Z�c��Р|s�f,xma�`�|K�c�`�̩!d. Transformer oil keeps the transformer cool. Does the oil have a specific gravity >1 or <1. Transformer Oil is used for insulation and cooling of transformer. In this case it should not lose its You need to take your sample from the top. Relative Density (Specific Gravity) 15ºC: D1298-≤0.96-0.92: Viscosity (mm 2 /sec) D445: ISO 3104 : 100ºC ≤15 ≤15: 7.7 - 8.3: 40ºC ≤50 ≤50: 32 - 34: 0ºC ≤500-190: Visual Examination: D1524: IEC 62770 4.2.1: Bright and clear: clear, free from sediment and suspended matter: clear, light green: Biodegradation: OECD 301: readily biodegradable: readily biodegradable Filtering process can reduce the acidity of oil to a great extent, thereby improving viscosity, specific resistivity, ageing characteristics, etc., hence extending the life-span of the oil. Use your best judgement on whether or not to de-energize. 0000005684 00000 n The first attribute you may see when taking an oil sample, would be color of the transformer oil. 0000000959 00000 n the insulation strength considerably. �O�����eyn���V��ꗅ�5`_��a�T���P��������s'/����K/Xx5�3F���z�����l4�4��z����r� ���ޓqd������l~;z�V�z��ap>�� ϡ^����t�O�D|�`�_`��̦��B�gA�����1�N$�R%�!WХ�U���A)|����U-��U�m:�(�_������H���*K�,��d�������_�/��0��j���|`���O��$Z"��D��Mid�)D�{��'u�з��M@����ӝG���ڜX�%{nz��P�E�h���^��iX��Vy>����L���V���r����w�o switchgears and power factor capacitors. It also insulates the transformer and allows electrical components to be more compact than free air apparatus. So the higher the temperature, the more moisture content will be exposed in the oil sample. If the oil is heated, its specific weight decreases, and vise versa when the oil is cold. Secondly, The dielectric strength of transformer oil is also known as the breakdown voltage (BDV) of transformer oil. If the transformer is under a vacuum, you need to apply a nitrogen blanket to bring the pressure up to 0 psi or above 0 psi to a positive pressure. ... DENSITY/SPECIFIC GRAVITY 0.888 Temperature (°C): 15 (g/ml): ... specification This information relates only to the specific material designated and may {8�u��2]��\Tޞ�n���6I��� �6}�AS�Ua �4�g���p�61U��a��D��?������.�J��n�JL`��t_���,�,��ܾ/�l��Y��ܟ+��#�@?�b���zN$N��D�>��u��1h]6I���|���h@TMz #�C*K�T�lӣoGku8�s��*�A���-�Sǃ�n�MQf�'���=�a{�8~hS�2݊ s�=h�d��Oq*Yj./'�6 DZ�v(��Qv+Պ�|�NR�i��,=[�Fq0�\���X�\Κ�p��h)Amզ0J�T�릉�*]`p%���� L^ N�!^,��ςs���@j�q4�=��P�D����GF|�Laldi#�Mq��$4�k6.o��A�ne���Փ��#��i�\;ō�n��yb="܆eӥL�+����O���+��2~�e2��B�|lm�`��G�f�>"�❖ē��ś�K�U��;!�\/�T��WO�1�F���ul6�U�3��p�� }��Q�3(\�1�K8����f�䜢����S��l�m�|���Op�rTu��\-d�k@�$0��E��!.���MS|���H����Z����vȱ)��n�S%�{�*҄�|��-�|���̳$���[��Ԍ�0tO/�Z�rS�C� 0000000740 00000 n The entire process usually takes 5-8 hours depends on the size of transformer. There are endless variables to why you may choose one of the oil types over another. www.ecmweb.com is using a security service for protection against online attacks. Overheating will produce ethylene and methane (300°F) or hydrogen and methane (1,112°F). If the oil has a specific gravity >1, this means the oil will settle to the bottom and any water or moisture will sit on top. Transformer Oil – What is it, and why sample? 3. The specific gravity is of an insulating liquid is simply the ratio of the density of the fluid to the density of water.
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