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In AC circuit, there are three concepts of electric power: active power, reactive power and apparent power. KVA stands for apparent power, which includes reactive power and active power. KW stands for active power, and kVar stands for reactive power. The relation between kW and kVar and conversion there is a concept - power factor cos ф, active power kW=UIcos ф, reactive power kVar=UIsin ф, and apparent power kVA=UI(U is voltage, I is current).

The winding and iron core of the transformer are the main components for transmitting and transforming electromagnetic energy, and ensuring their safe operation is a problem that people are concerned about. Statistics show that the fault is caused by the iron core problem, accounting for the third place in the total transformer accident. The manufacturing department has paid attention to the defects of the transformer core, and has made technical improvements in the metal hose and stainless steel hose grounding monitoring of the iron core and ensuring a little grounding.

With the development of the power system in the direction of energy saving and intelligence, the quality, reliability and performance requirements of power transmission and distribution and control equipment are gradually improved. In order to adapt and meet market demand, manufacturers of power transmission and distribution and control equipment continue to improve Product structure, improving product performance, and strengthening independent R&D and exploration of new technologies, new industries, new formats, and new models. Its development presents the following trends:

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