VALVE  POSITIONER

VALVE POSITIONER CALIBRATION SET UP AND PROCEDURE / MAINT 1. INTRODUCTION OF VALVE POSITIONER The positioner  is  a  high-gain  plain  proportional  controller  which  measures  the  valve  stem position (to within 0.1 mm), Compares that measurement to its set point (the controller output signal),  and,  if  there  is  a  difference,  corrects  the  error  .The  open-loop  gain  …

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Physical and chemical properties of SF6 Gas Circuit Breaker

In an SF6 circuit breaker, sulphur hexafluoride gas is employed because the arc ending medium. The, sulphur hexafluoride gas (SF6) is an electronegative gas and has a strong tendency to absorb free electrons. The contacts of the breaker opened in a high-pressure flow sulphur hexafluoride (SF6) gas and an arc is struck between them.  1. FUTURE: SF6 circuit breaker has the following •Superior Interrupting capability: This breaker will with success interrupt …

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Transformer Routine Maintenance: maintenance is most importance of electrical equipment

The following chapters address routine maintenance, some processes area unit typically higher than and on the far side routine maintenance work to stay the transformer operational.  Transformer medical specialty needs specialized instrumentation and coaching. This experience isn’t expected to be maintained in each workplace. In some cases, it should be necessary to contact medical specialty specialists, either within or outside Reclamation, World Health Organization have the most recent instrumentation and up to date expertise. Shows the transformer condition assessment methodology, linking routine maintenance and diagnostics 1 Introduction to Reclamation Transformers Standards organizations like American National …

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Transformer cooling system

1.method of Cooling transformer cooling system is Increasing the cooling rate of a transformer will increase its capability. Cooling ways should not solely maintain a sufficiently low average temperature however should stop associate degree excessive temperature rise in any portion of the transformer. For this reason operating elements of enormous transformer are typically submerged in best …

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Importance of transformer bushing/polarity

1. Transformer Bushings In electric power, a bushing is a hollow electrical insulator that allows an electrical conductor to pass safely through a conducting barrier such as the case of a transformer or circuit breaker without making electrical contact with it. The two most typical kinds of bushings used on transformers as main lead entrances square measure solid ceramic ware bushings on smaller transformers and …

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Autotransformers

1. Autotransformers It is attainable to get electrical device action by suggests that of one coil, provided that there’s a “tap connection” somewhere on the winding. Transformers having only 1 winding area unit known as autotransformers, shown schematically in figure. An autotransformer has the standard core however only 1 winding, that is common to each the first and secondary circuits. The primary is usually the portion of the winding connected to the AC power supply. This transformer could also be wont to step voltage up or down. …

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