When drying larger transformers, the residual moisture may be as low as about 0,3%. The main source of the buildup of water in transformers is the atmosphere and there are several mechanisms and occasions for moisture ingress. endstream endobj 180 0 obj <>stream 46 7.2 Choice of transformers based on energy losses and efficiency 46 7.3 Efficiency requirements and classes for transformers 49 7.4 Selection criteria for transformers based on capitalization of the losses 49 7.5 Example of a transformer for a transformation substation 51 7.6 Level of noise in the transformers Short circuit tested to: SANS 780-IEC 60076-5 and Eskom specific 34-346 kVA: 16 Voltage: 11 000/240V Size: H 700mm x W 580mm x L 700mm Number of Phases: Single Phase Impedance %: 4.5 Weight: 155kg Oil Volume: 48L C – Substation Standards Mimic Bus Color Standard 64. %PDF-1.6 %���� The following transformers have been successfully short circuit tested to SABS-IEC 60076-5 and Eskom specifications: − 16kVA 11 & 22kV/240V Single phase − 32kVA 11 & 22kV/± 240V LV Dual phase − 25kVA 11 & 22kV/415V Three Phase Dyn11 − 50kVA 11 & 22kV/415V Three phase Dyn11 − 100kVA 11 & 22kV/415V Three phase Dyn11 3. A lot of issues were addressed during this process, and now that the company has introduced the new transformer specification we are seeing the benefits of that. Eskom Distribution recognized that reliability improvement required a lifespan performance study on large power transformers. �t����z=���i����_��}�/��Qe����ؔ9�}�e>o]�D穯SU� be}��UfX�f�I�9����e�P��4�� R�ek5$E]l4�j���vu�J�����:Ûj*P�浂����6�u����-�z����Ӫ�JH�>�g��;.a���wH0�=��'�X�z� Unfortu-Comparison of temperature rise of 25-kVA nately, the colors that give the best radiation of transformers located indoors transformer heat will permit the highest absorp­ tion of heat from the direct rays of the sun. h�246P0P����M-ILI,IT�4 Find Power Transformers on GlobalSpec by specifications. All necessary parts are masked to prevent paint over-spray. The PDE Standards. The specifications include the following: Acquisition of transformers and transformer components that fit the intended purpose and prove reliable for the intended... Acquired transformers and components require minimum maintenance. Transformers painted to specification 8. Password e.g. Eskom provides a Technology Web site which allows secure access to equipment Design and Manufacturing specifications information. Summary Prince Moyo provides an overview of ESKOM – Africa’s largest and one of the largest utilities in the world, which annually invests more than USD 250 million in medium and large power transformers, and even more in distribution transformers. �� V�� 42 7. Application for ammendment of Eskom's electricity distribution license to include Nkosi city area in its electricity areas of supply Health-related information on COVID-19 # South African Government information on COVID-19 Welcome to the Eskom Customer Service Website To Login choose either option 1 or 2 below, fill in your details and click enter : Eskom Account Number. endstream endobj 181 0 obj <>stream • Custodian of all power transformer documentation within Eskom Generation. Transformer compound refurbishment, including bund walls 6. Transformer Specialist at Eskom South Africa 500+ connections. He talks about ESKOM’s transformers and reactors fleet, the challenges and major changes underway at […] It goes on to address fundamental transformer principles, specification, design and construction. Find Transformers on GlobalSpec by specifications. wv�#�m����J" ���ǁ���qlԲ�4�{�mz�knF��,�/�7qc�V�&/dh~�L���e\�G�`��iaZ]�m�k�I���>�(=/�>�W ��N� �J��\d�v̶>�^T^�Rٶ��⅖����4�B}+O�4� FOR TRANSFORMERS AND SWITCHGEAR 1 Scope This International Standard covers specifications and test methods for unused mineral insulating oils. PDE Standards. To date, more than 250 transformers have been supplied to Eskom. CEE.0023.90: Specification for installation of cables. • Custodian of all power transformer documentation within Eskom Generation. transformers shall be double copper wound, three phase, oil immersed with ONAN cooling and fitted with on load tap changers for 8.00 MVA Transformer only. 1.1 This guide describes methods of testing and specifications for electrical insulating liquids intended for use in electrical cables, transformers, liquid circuit breakers, and other electrical apparatus where the liquids are used as insulating, or heat transfer media, or both. Password e.g. The important aspects of understanding how a transformer and its environment interact and the measures that must be taken to preserve both, are explained. Group Technology Engineering Eskom Megawatt Park, Maxwell Drive, Johannesburg,2000 P.O.Box 1091, Johannesburg, 2000 SA Tel +27 11 800 3648 Fax +27 86 660 2806 www.eskom.co.za Eskom … We'll leave out large power system transformers since they fall under Eskom and municipalities. ����&u��4�bZ~�|�1m�,_��s?�k�3�Lt��š��D��>����0R�ah�w��� [�B+�p]5kY`�g���E&7WL �3�l�+��-�T��j���9O�4 61. D – Substation Standards Duplex Switchboard Panel Wiring Diagram and Cabling Methods 63. TaYi3428 : If you would like to register or you have forgotten your password please click the buttons below.