CNC machining, Molding, Metal parts, Die casting, Lead acid battery machine

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After Oil immersed transformer be installed, we should do testing works as follows: 1. Telemetry of insulation resistance: (1) Telemetry project, high pressure to low pressure and ground (shell), low pressure to high pressure and ground (shell) (2)Select 2500V megohm meter, the appearance of megohm meter should be good, complete shell, flexible shake handle, no long resistance pointer, no glass damage. (3) Open circuit test of megawatt-hour meter, separate two pens, shake the handle of megawatt-hour meter up to 120 y/min, the needle pointing to infinite (∞) is better. Short circuit test: shake the handle of megawatt-hour meter, overlap two than instantaneous, the needle pointing to “0” (zero), indicating that megawatt-hour meter is normal. (4) Qualified value: at 20℃+, the new transformer is not less than 450 MΩ, and the operation is not less than 300 MΩ. This value should not be reduced by 30% compared with the previous value. (5)Absorption ratio R60/R12 should be 1.3 tim...

Distribution Transformer Installation:   When   Distribution Transformer   is delivered to work place, what inspection works should be done before installing. Which inspection should be made before Distribution Transformer Installation? 1. Distribution Transformers will suffer great vibration after long-distance transportation, and need to be inspected. The inspection of transformer body is divided into suspension core and suspension cover. No matter the core or hoods, the contents of inspection are consistent. Inspection of suspension core should be completed within one working day to speed up the inspection process. 2. As an example of the hanging core inspection : (1) Transformer suspension core should be carried out indoors, if there should be a tent outdoors, to prevent rain, snow, fog, sand and other bad weather prohibition suspension core. (2) In winter, the temperature of suspension core should not be lower than zero, otherwise, the temperature of ...

In   Transformer tank   painting works, we will have the problems,such as:pin-holes,bubbling,orange skin,cracking etc. Today, we will analysis the defect reasons and how to solve the problems. Painting Sticky of Transformer Tank 1. Phenomenon: After drying, some or all of the adhesive marks occur on the coated transformer tank surface. 2. Reasons: (1) Too much slow-drying solvent is added to the paint, the solvent can not volatilize; (2) insufficient or no curing agent is added; (3) the oil tank coating surface is polluted; (4) the climate changes sharply during painting processes, painting in rainy season and high humidity; (5) the coating is too thick, the interval between layers is insufficient, the paint film is not dry. 3. Countermeasure: (1) Choose appropriate dry solvent, and do not excessively add; (2) add curing agent in proportion; (3) keep the coated surface free from pollution; (4) ensure good ventilation during construction in adverse ...