Customers are best to visit their product manufacturers to inspect and check their products, production processes, factory inspection and other procedures, which can also make their hearts have a bottom.Lets talk about it in detail below!
The capacity level of the capacity transformer of the transformer
The optimal load rate (that is, the load rate when the highest efficiency) of the transformer is not in the rated state, but between 40%and 70%.The load rate is too high, and the loss of the star increases; on the other hand, due to the small capacity and grid of the transformer, and the load increases slightly, it is necessary to replace the large -capacity box change. Frequent contusion will inevitably increase investment and affect power supply.Select the transformer capacity, based on the existing load, and consider the load development appropriately. The voltage capacity can be determined according to the 5 -year power development plan.
Common misunderstandings for transformer purchases
1. As long as the products produced by prestigious manufacturers must not be inferior to inferior transformer manufacturers, due to brand, technology, funds, etc., have certain advantages in industry competition.However, it is for some products such as 110kV and 220kV voltage levels. Due to its high entry threshold, ordinary small power distribution manufacturers have no power to produce such products.However, for the 10kV -level transformer, any company can do it, and some small manufacturers are more advantageous than large enterprises due to factors, regions, and after -sales factors.For example, a transformer factory in Hubei won the bid in the bidding business of the Southern Power Grid in December 2011. However, in the sampling inspection of the products provided, most of its products are inferior products of semi -copper and semi -aluminum, resulting in the loss of them in the southEligible for the bidding of the power grid.
2. As long as the price is low, it is good to choose the quality and low price, but there is also the view of "cheap and no good goods".Therefore, it is advised that customers must not only consider the price when buying a transformer. We must choose multiple manufacturers for comparison. After multiple analysis, make a final decision.Another suggestion is that customers are best to visit their product manufacturers to inspect and check their products, production processes, factory inspection and other procedures, which can also have a bottom of their hearts.
3. In order to attract customers by the manufacturers verbally promised to attract customers, they make "lifelong maintenance", "one years replacement" and "absolute all copper" during the negotiation, but when buying productsThese commitments are written on the contract, causing the manufacturer after the product problem does not recognize the account, so you must write any promise in a written form, so as to fulfill the customers interests as much as possible.
How to maintain the transformer
1. When the temperature transformer runs, its coils and iron cores will cause copper and iron loss. These losses become thermal energy to increase the iron core and coil temperature of the transformer.If the temperature exceeds the allowable value for a long time, the insulation will gradually lose the elasticity of the machine and make the insulation.The temperature of each part is different when the transformer runs, and the temperature of the coil is the highest. The temperature of the iron core is lower than the temperature of the insulating oil than the temperature of the coil and the iron core.The upper oil temperature of the transformer is higher than the lower oil temperature.The allowable temperature in the transformer to be checked according to the upper oil temperature.In normal operation of the A -level insulation transformer, when the surrounding air temperature is up to 400C, the extreme working temperature of the transformer winding is 1050C.Because the temperature of the winding is 100c higher than the oil temperature, in order to prevent the oil quality from deteriorating, the upper oil temperature of the transformer does not exceed 950C. Under normal circumstances, in order to prevent the insulating oil from oxidation, the upper oil temperature should not exceed 850C.For transformers that use obsessive oil circulating water and cold, the upper oil temperature should not often exceed 750C.(The maximum allowable value of the upper oil temperature of this transformer is 800C)
2. Allows the temperature of the upper layer of oil during the operation of the transformer only, and it cannot ensure the safe operation of the transformer. It must also monitor the temperature difference between the upper oil temperature and cooling air -that is, the temperature rise.The difference between the temperature of the transformer and the surrounding air is called the temperature rise of the transformer.For the transformer of the A -level insulation, when the maximum temperature around is 400C, the national standard stipulates the temperature rise of 650C of the winding, and the temperature of the upper oil temperature allows 550C.As long as the transformers temperature is not exceeds the specified value, it can ensure that the transformer runs safely within the operating period specified under the rated load.(The transformer can run with a rated load for 20 years when the transformer runs normally)
3. When the reasonable capacity is running normally, the power load that the transformer can bear should be about 75-90% of the rated capacity of the transformer.

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