What should be considered when lifting the transformer oil tank?

What should be considered when lifting the transformer oil tank? For transformers with flat covers, when conducting maintenance on the body, it is essential to use lifting equipment with a capacity greater than the weight of the body to hoist it for inspection. To facilitate user maintenance without large lifting equipment, for bodies weighing 15 to 25 tons, the oil tank is usually designed as a bell jar tank. Even in large transformers, the upper oil tank typically weighs around 15 tons. When maintaining transformers with bell jar tanks, only the upper oil tank needs to be lifted. It is crucial to note that if the transformer core in the […]

How does coastal environment affect the operation of transformers? In coastal areas, the air contains salt spray, which impacts the creepage of bushings and leads to metal corrosion. To express the required leakage ratio for bushings, an equivalent salt density can be used, and the corresponding values are listed in the leakage ratio. Equivalent salt density refers to the equivalent amount of sodium chloride in the deposited contaminants on the insulation surface of the bushing. Dissolving all the deposited contaminants on the insulation surface of the bushing and the equivalent salt density of sodium chloride in the same volume of distilled water results in substances with the same volume conductivity.

How does environmental pollution affect the operation of transformers? Pollution can impact the surface discharge strength and surface paint of bushings, and it’s possible to choose bushings with a certain leakage ratio based on different pollution levels. According to national standards, there are several leakage ratios available for selection: Level 0: 14.8mm/kV Level I: 16mm/kV, equivalent to a composite salt density of 0.05mg/cm² Level B: 20mm/kV, equivalent to a composite salt density of 0.1mg/cm² Level III: 25mm/kV, equivalent to a composite salt density of 0.2mg/cm² Level IV: 31mm/kV, equivalent to a composite salt density of 0.4mg/cm² Leakage ratio refers to the ratio of the minimum nominal surface creepage distance of

The Role of Single Point Grounding of Iron Core and the Anomaly of Multiple Point Groundings In the electrical and electronic industry, the application of ground protection is very important. Iron core single point grounding is the most commonly used ground protection method, which requires a special grounding bar and appropriate grounding resistance to be connected to the neutral point of the transformer. Its role is to prevent the short circuit of equipment, improve the safety performance, reduce the electromagnetic radiation, and prevent the electromagnetic interference from outside. In addition, it can also reduce the neutral current, reduce the harmonic interference generated by other loads and make the current more

Causes and Measures of Winding Short Circuit The winding short circuit will cause serious damage to the motor and other electrical equipment. In order to prevent the occurrence of winding short circuit accidents and ensure the safe operation of electric motor, it is necessary to understand the causes and corresponding preventive measures in depth. First of all, the main causes of winding short circuit accidents are mainly divided into two categories. One is due to the internal insulation failure of the winding, such as insulation aging and cracking; the other is due to the short circuit between the turns of the winding. The former may be caused by the quality

Types and Characteristics of Commonly Used Insulation Materials Insulation materials play an important role in the electrical and electronic industry. With the development of industry, various types of insulation materials have emerged. Here we list the types and characteristics of the most common insulation materials. 1. Polyvinyl Chloride (PVC): PVC is a kind of general purpose plastic insulation material. It has excellent mechanical properties, good chemical stability and surface hardness, and should be avoided lacquer and acid. It has good fire resistance and electrical insulation properties and is suitable for dry, wet, and corrosive environments. 2. Polyurethane foam: it has a light texture and can be made into various rigid

What is the relationship between transformer insulation level and temperature rise standard？ Insulation level and temperature rise: The insulation level of a transformer refers to the maximum allowable temperature rise, which is the heat resistance level of the insulation material used in the transformer. The temperature rise, on the other hand, refers to the temperature difference between the inside of the transformer and its surrounding environment. The insulation level of transformers is classified into different levels, such as A, E, B, F, and H. Each insulation level corresponds to a different maximum allowable temperature rise limit. For example, the A-level insulation winding temperature rise limit is 60K, the E-level insulation

What is the difference between foil winding and wire winding in transformers? Foil winding refers to the winding made by winding aluminum foil or copper foil, and one turn is one layer. Foil winding is suitable for low voltage, high current transformer.Wire winding means winding with one or more wires in circles, mainly used for transformers with rated current below 200Ampere.Foil winding is convenient to make, high efficiency, stronger short-circuit resistance, and less loss. However, the height of the coil is limited by the height of the foil, and a special foil winding machine is required.Wire winding is relatively complex to make, but the cost of the conductor material is

What is the differences between Shell-Type and Core-Type Transformers Transformers are essential devices in the transmission and distribution of electrical power. They are used to step up or step down voltage levels as required in various applications. The two most common types of transformers are the shell-type and core-type transformers. The primary difference between these two types of transformers is the arrangement of the primary and secondary coils. In a shell-type transformer, the primary and secondary coils are wound on a central magnetic core, while in a core-type transformer, the primary and secondary coils surround a central magnetic core. One of the advantages of shell-type transformers is that they can

The Reason behind Laminating Silicon Steel Sheets in Power Transformers Silicon steel sheets are widely used in the manufacturing of power transformers due to their low magnetic losses. These sheets are made by rolling steel into thin sheets and then laminating them to reduce eddy current losses. The process of laminating silicon steel sheets is done by stacking them one on top of the other, creating a laminated core. But what is the reason behind laminating these sheets? The main reason behind laminating silicon steel sheets is to reduce eddy current losses. When an alternating current flows through a conductor, eddy currents are induced in the conductor. These eddy currents