Reliability is one of the most important aspects we should be focused on especially when it comes to Plant Maintenance. Frequent shutdowns in plant could be caused by poor maintenance management and lack of advance tools to keep the system running. For a plant working 24/7, most of the running equipments should be treated critically and monitored regularly. However, Redundant Systems are used to save the plant from shutdowns if failure occurs. Aside from back-up power we should always thought of back-up systems that will manually or automatically take over the operations in the event of fault or alarm. In this article, I will share with you the redundant systems that I have encountered by working in Maintenance Department and Engineering Design.
20/25 MVA Oil-filled Transformer Transformer is an electrical static machine whose aim is to increase and decrease an Alternative Voltage. Runs on magnetic affect, without any part being in motion. Usefulness of Transformers The transport of electrical energy at high voltage allows to convey less current in the lines (P = 3 V I cos ). For given amount of losses, transportation under limited current, allows to use conductors with lower cross sectional areas, i.e. cheaper! Also structures that can stand these conductors will be less restrictive because a lower cross sectional area also means a reduced weight. That is why it is cheaper to transform the voltage and use intermediate voltages, especially when distances become longer… The transformer also provides a galvanic insulation, i.e.. the primary and
Table of contents ONAN Cooling Method What are the types of Transformer Cooling method and their differences? Transformer always have losses thus, generates heat. It should be rectified with proper cooling system to avoid failure. Transformer can be classified in to two types which are Dry-type and Oil-immersed Type. For dry-type transformersAir Natural (AN)Air BlastFor oil-immersed tranformersOil Natural Air Natural (ONAN)Oil Natural Air Forced (ONAF)Oil Forced Air Forced (OFAF)Oil Forced Water Forced (OFWF) Cooling methods for Dry type Transformers Air Natural or Self air cooled transformer This cooling system is generally used in small type transformers upto 3MVA. It is when Transformer is being cooled by air. Example is when a control transformer is inside a control panel or installed in a control room with just