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Transformer faults can be divided into internal faults and external faults.Transformer internal faults refer to the faults that occur in the transformer oil tank, including phase-to-phase short circuit of each winding, inter-turn short circuit of winding, short circuit fault between winding and iron core, single-phase grounding fault of single-phase winding or lead-out wire passing through the shell, winding disconnection fault, etc. Transformer external faults refer to various faults that occur on the external insulating bushing of the transformer oil tank and its lead-out wires, including single-phase grounding short-circuits and phase-to-phase short-circuits between lead-out wires caused by flashover or broken insulating bushings.

Electrical Technology Q&A (1.1)What is the basic content of Kirchhoff's law?2. What is skin effect?3. What are the concepts and characteristics of parallel resonance?4. How are eddies created? What is eddy current loss?5.What is the transition process? What causes the transition process?6. What is the superposition principle?

This paper analyzes the harm and cause of unbalance of three-phase load of distribution transformer, and puts forward some measures to solve the unbalance.  

In the past year, I thank all new and old customers for their trust and support in CANWIN. As the Chinese Lunar New Year approaches，CANWIN wishes all new and old customers good luck, good health and happy family! In the new year, we will continue to bring more and better transformers and intelligent equipment and better pre-sale and after-sales services to new and old customers at home and abroad, and create more value for the society! Let's work together for a better future!

The power loss of the transformer is divided into iron loss and copper loss. Iron loss is also called no-load loss, which is its fixed loss. It is actually the loss generated by the iron core (also called iron core loss, and copper loss is also called load loss).

A new breakthrough in UHV technology! Successful test of new generation a million volt transformer.On Oct. 28, TBEA (20.730, -0.94, -4.34%) was informed that the new generation of direct outlet 1000kV AC extra-high voltage transformer produced by TBEA recently passed all the tests at one time, and TBEA became the first company in China to pass all the tests of the new generation of megavolt transformer at one time.In order to meet the high reliability of high-altitude equipment, TBEA set up a special research group and passed the product development at one time after many special demonstrations and guidance from the State Grid and industry experts.The product adopts a new direct outlet device for the first time and fixes it on the body, avoiding the risks brought by the process of disassembling and reassembling on site after the test of indirect outlet device; adopts a new coil insulation structure for the first time to further improve the insulation characteristics, short-circuit resistance, temperature rise distribution and workshop production process of the product, especially to meet the requirements of transformer temperature rise in high altitude areas; adopts a new oil tank explosion-proof design concept for the first time, significantly improving the transformer's explosion-proof performance. With the application of these new technologies, the technical performance of the new generation of mega-voltage transformers surpasses that of its predecessors, reducing the total loss by more than 80kW and significantly improving the energy efficiency level of the products.The successful test of the new generation of million volt transformer not only improves the safety and stability of China's AC transformer operation in high altitude areas, but also plays a very important role in the consumption of clean energy and ensuring the stable operation of the power grid.Source: China Science and Technology NetworkCANWIN also the equipment supplier for TBEA ，If you have demand for CRGO cutting machine and slitting line and transformers, welcome to contact us.

1. What are the consequences of different connection groups for parallel operation of transformers?Answer: When transformers of different connection groups are operated in parallel, the secondary circuit will generate voltage difference due to different secondary side voltages of transformers Δ U2, because the total phase difference in transformer connection is a multiple of 30 ° Δ The value of U2 is large. If the phase angle difference of the secondary side of the parallel transformer is 30 °, Δ The U2 value is 51.76% of the rated voltage. If the short-circuit voltage Uk of the transformer is 5.5%, the equalizing current can reach 4.7 times of the rated current, which may burn the transformer.A large phase difference produces a large equalizing current, which is not allowed. Therefore, transformers of different groups cannot operate in parallel.

Gas protection is the main protection for transformer internal faults. It can act sensitively to transformer inter-turn and inter-layer short circuits, iron core faults, internal bushing faults, internal winding disconnection, insulation deterioration and oil level drop. When a fault occurs inside the oil-immersed transformer, the arc will decompose the insulating material and generate a large amount of gas, which flows from the oil tank to the oil pillow, and its intensity varies with the severity of the fault, reflecting the air flow and oil flow The action protection is called gas protection, also called gas protection. During the operation of the transformer, due to internal faults, sometimes we cannot identify and take measures in time, which is easy to cause some accidents. After the protection of the gas relay, the occurrence of similar incidents can be avoided to a certain extent.

Why was Edison alone and not a team of people who invented the electric light bulb?Why was Tesla the only one who discovered electricity and not a team?Why did Coulomb discover the effects of magnetic fields alone and not a team?Because only a very few people can endure loneliness and devote themselves to research without seeking for them, companies that truly have the ability to invent and create often have nothing to do with the company's business scale and the number of R&D personnel, but only with the obsession of team members and years of years. It's all about perseverance!It's harvest season again, good morning everyone!This is the CANWIN equipment manufacturing site. Multiple shear-stacking integrated iron core machining centers are being manufactured in small batches!To know more, Click https://www.canwindg.comEmail: info@canwinsg.com WhatsApp:+8613702282846 #spacertypehighspeedslittingline #transformercore #cuttolengthline #cuttolength #cuttolengthlinemachine #siliconsteelsheetcutting #cuttolengthlinemachinesupplier #drytypetransformermanufacturers #Distributiontransformer #oilimmersedtransformersupplier #cuttolengthlinemanufacturers #transformercore #SlittingLineManufacturer #canwin #automaticallystackedmachine #spacertypeslittingline #highspeedslittingline

CAWIN Automatic Equipment Manufacturing Co., Ltd. is a supplier of State Grid, China Southern Power Grid, and a professional manufacturer of high-end electrical equipment in China. The main business is electrical intelligent equipment manufacturing, power equipment production customization, high-end intelligent transformer production line series equipment, various dry-type transformers with high performance requirements, and electrical materials trade. The dry-type transformers produced by CANWIN have reasonable design and simple structure. It has the advantages of simple operation, high safety, high sensitivity, low loss, low noise, energy saving and environmental protection. Best-selling at home and abroad, well received.

At present, all countries in the world generally adopt the transformer core shearing distribution mode, which is also a relatively advanced industrial chain service mode that my country has been paying attention to and learning from. In recent years, with the development of my country's intelligent manufacturing technology, the progress of transformer core intelligent manufacturing technology and the outbreak of new coronary pneumonia have further promoted this progress.

1. Winding failureThere are mainly inter-turn short circuit, winding grounding, phase-to-phase short circuit, wire breakage and joint welding. The reasons for these failures are as follows:① During manufacture or maintenance, local insulation is damaged, leaving defects;② Due to poor heat dissipation or long-term overload during operation, sundries fall into the windings, causing the temperature to be too high and the insulation to age;③ The manufacturing process is poor, the pressing is not tight, the mechanical strength cannot withstand short-circuit impact, and the winding is deformed and the insulation is damaged.