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Hunan Hentg Power Electric Technology Co., Ltd.
HENTG Power is an ISO9001 certified transformer manufacturer specializing in reliable, high-performance solutions for global power systems since 2011.With an 100,000 m² factory, over 250 skilled workers, more than 30 senior engineers, and 10+ professional testing engineers, HENTG Power is dedicated to delivering high-quality transformer solutions with strong production capacity 20000+ units/year.Our products comply with GB 20052-2024 and IEC 60076 standards, and are widely used in global markets ...
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No. of Employees:
250+
Annual Sales:
100000000+
Year Established:
2011
Export p.c:
70%
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THE BEST SERVICE!
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+86-15074989773
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quality Oil Immersed Transformer & Dry Type Transformer factory

Copper Winding Single Phase Pole Mounted Transformer Oil Immersed 167 KVA IP23 Video

Copper Winding Single Phase Pole Mounted Transformer Oil Immersed 167 KVA IP23

Frequency: 50Hz, 60Hz

Phase: Single Phase

Application: Distribution System

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167 Kva Pad Mounted Transformer Variable Step Up Down Single Phase Transformer Video

167 Kva Pad Mounted Transformer Variable Step Up Down Single Phase Transformer

Type: Distribution Transformer

Material: Copper, 100% Copper

Frequency: 50Hz, 60Hz

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Outdoor Copper Electrical Power Transformer 35KVA Oil Immersed Three Phase IP54 Level Video

Outdoor Copper Electrical Power Transformer 35KVA Oil Immersed Three Phase IP54 Level

Type: Power Transformer, Oil-filled Power Transformer

Material: Aluminum, Copper Winding

Frequency: 50Hz, 60Hz

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MV HV Electrical Dry Type Distribution Transformer Three Phase 160kva 200kva 250kva Video

MV HV Electrical Dry Type Distribution Transformer Three Phase 160kva 200kva 250kva

Frequency: 50Hz, 60Hz

Phase: Three

Coil Number: Multi Winding, Two Windings, Three Windings, Single Winding

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WHAT CUSTOMERS SAYS
China Mobile
We have been working with this transformer supplier for five years. It is worthy of long-term trust.
Sinopec
Their engineering team tailored a solution for us that greatly improved system efficiency.
People's Bank of China
We attach great importance to product quality and delivery time. This transformer manufacturer has very professional packaging and logistics.
China Telecom
We have been cooperating for 3 years. The technical feedback is fast and the cooperation is very pleasant.
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What happens when a power transformer fails?
What happens when a power transformer fails?
When a power transformer fails, the situation can be very serious, with consequences ranging from damage to the equipment itself to the paralysis of the entire power grid, and even safety incidents such as fire or explosion. Exactly what happens depends on the type of fault, its severity, the design of the transformer, and how quickly the protective devices can operate. Here are some possible scenarios: Abnormal phenomena (observable signs): Overheating: A large amount of heat is generated locally at the fault point, causing the oil temperature or winding temperature to rise sharply. The thermometer or thermal imager will alarm. Abnormal sound: Strong "buzzing", "crackling", "bursting" or even "roaring" sounds are heard inside. This is caused by strong electromagnetic vibrations caused by arc discharge, insulation material rupture, loose core or severe overcurrent. Abnormal oil level change: Gas generated by internal faults or large amounts of gas generated by high-temperature decomposition of insulating oil by arcs may cause abnormal oil level increase (increased pressure) or decrease (leakage). Oil spray or oil leakage: A sharp increase in internal pressure may cause the pressure relief valve to spray oil, or oil tanks, pipes, radiators and other parts may rupture and leak oil due to overheating, pressure or mechanical stress. Smoke and fire: High temperature and arcs may ignite insulating oil or solid insulating materials, causing the transformer to smoke or even catch fire. Gas generation: Insulating oil decomposes under high temperature and arcing to produce gases such as hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide, etc. (Dissolved gas analysis/DGA is an important fault diagnosis method). Large amounts of gas accumulation may cause a sudden increase in pressure. Shell deformation or rupture: In extreme cases, huge internal pressure or arc energy may cause the transformer tank to swell, deform or even burst. Internal damage: Winding failure: Turn-to-turn short circuit: The insulation between adjacent turns in the same winding is damaged, forming a short-circuit loop and causing local overheating. Interlayer short circuit: The insulation between winding layers is damaged. Phase-to-phase short circuit: The insulation between different phase windings is broken. Winding short circuit to ground: The insulation between the winding and the core or tank (ground) is broken. Winding open circuit: The wire is broken or the connection point is unsoldered. Winding deformation/displacement: The huge short-circuit electromotive force causes the winding to mechanically deform, loosen or even collapse. Core failure: Core multi-point grounding: The core should be designed to have only one reliable grounding point. If there is an additional grounding point, a circulating current will be formed, causing local overheating or even melting of the core. Short circuit between core pieces: Damage to the insulating paint leads to short circuit between pieces, resulting in increased eddy current loss and overheating. Insulation system failure: Aging, moisture, and breakdown of solid insulation (cardboard, stays, etc.). Aging, moisture, contamination, carbonization, and decreased breakdown strength of insulating oil. Tap switch failure: Poor contact, contact erosion, insulation breakdown, mechanical jamming, or drive mechanism failure. Bushing failure: Flashover, dirty discharge, internal moisture or cracking leading to breakdown, or seal failure and oil leakage. Cooling system failure: Radiator blockage, fan/oil pump stoppage, cooling pipeline leakage, resulting in poor heat dissipation, temperature increase, accelerated insulation aging or failure. Impact on electrical system: Relay protection action: Transformers are equipped with multiple protections (differential protection, gas protection, overcurrent protection, pressure release protection, temperature protection, etc.). When a fault occurs, the relevant protection devices will quickly detect the abnormality (current imbalance, gas generation, pressure increase, excessive temperature) and act: Trip: Disconnect the circuit breaker connected to the transformer and isolate the faulty transformer from the power grid. This is the most critical link, aimed at preventing the accident from expanding. Alarm: Send out sound and light signals or remote alarm information. Voltage fluctuation or drop: The fault itself or the protection tripping will cause the bus voltage connected to the transformer to drop or fluctuate instantly, affecting the power supply quality of downstream users. Power supply interruption: If the faulty transformer is a key node in the power supply chain, its tripping will cause a large-scale power outage in the area it supplies power. System stability issues: The tripping of a large main transformer fault may disrupt the power balance and stability of the power grid, and in severe cases may cause a larger-scale power outage or even system collapse (cascading failure). Short-circuit current shock: A short-circuit fault inside the transformer will generate a huge short-circuit current, which will not only cause devastating damage to the transformer itself, but also cause huge electromotive force and thermal stress shock to the busbars, switchgear, lines, etc. connected to it. Safety risks: Fire and explosion: The sprayed high-temperature flammable insulating oil is very likely to cause a fire when it encounters air or electric arc. In a confined space, the oil-gas mixture may explode. This is the most dangerous situation. Toxic substance release: Burning insulating oil and insulating materials will release toxic smoke and gas. Equipment damage splash: Explosion or oil tank rupture may cause high-temperature oil, debris, and parts to splash, causing harm to personnel and nearby equipment. Environmental pollution: Large amounts of insulating oil leakage will pollute soil and water sources.
2025-02-06
What is the structure of a transformer?
What is the structure of a transformer?
Understanding Transformer Structure: Key Components and Design Explained Body:Transformers play a vital role in power distribution, and their internal structure determines their performance and reliability. A standard transformer consists of the following main components: Core: Made of laminated silicon steel sheets to reduce energy loss and provide a magnetic path. Windings (primary and secondary): Copper or aluminum coils that transfer energy through electromagnetic induction. Insulation: Prevents electrical faults and ensures safe operation. Oil Tank: Usually contains oil (oil-immersed transformers) to dissipate heat and protect internal parts. Oil Conservator and Vent (Oil-immersed Transformers): Maintains oil level and prevents moisture intrusion. Cooling System: Air or oil-based system used to control heat. Bushing: Insulated terminals for external electrical connections. Understanding these components helps engineers and maintenance teams ensure optimal operation and life of the transformer.
2025-07-18
What factors should be considered when selecting a transformer?
What factors should be considered when selecting a transformer?
1. Voltage level: Determined according to the input and output voltage requirements of the actual application scenario, it needs to match the grid voltage and the rated voltage of the electrical equipment, including the voltage values of the primary and secondary sides, such as the common 10kV/400V, etc.2. Capacity: Select according to the power demand of the load, considering the active power and reactive power of the load, generally in kilovolt-amperes (kVA), and need to meet the maximum power demand of the load, and appropriately reserve a certain margin to cope with possible load growth.3. Winding form: Commonly used are single-phase and three-phase windings. Single-phase is suitable for occasions with low power and single-phase loads, and three-phase is used for three-phase power supply and high power loads. In addition, there are special multi-winding transformers that can meet systems with multiple voltage output requirements.4. Core material: Mainly silicon steel sheet and amorphous alloy materials. Silicon steel sheet core is widely used and has good magnetic conductivity and cost performance; amorphous alloy core has lower iron loss, can effectively reduce energy consumption, and is suitable for occasions with high energy saving requirements.5. Cooling method: including oil-immersed self-cooling, oil-immersed air cooling, dry self-cooling, dry air cooling, etc. The oil-immersed type has good heat dissipation effect and large capacity, but the maintenance is relatively complicated; the dry type is more environmentally friendly, safe, and simple to maintain. It is often used in places with high requirements for fire prevention and explosion prevention.6. Short-circuit impedance: Short-circuit impedance affects the short-circuit current and voltage fluctuation of the transformer. Generally speaking, the short-circuit impedance is large and the short-circuit current is small, but the voltage change rate may be large. It is necessary to select a suitable short-circuit impedance value according to the stability of the system and the short-circuit capacity requirements.7. Insulation level: Determined according to the use environment and voltage level, it must be able to withstand the influence of factors such as overvoltage and insulation aging in the system to ensure the safe operation of the transformer, including the selection of insulation materials and the design of insulation structure.8. Overload capacity: Consider the possible short-term overload of the load, and select a transformer with appropriate overload capacity to ensure that it will not be quickly damaged when overloaded. Transformers of different types and designs have different overload capacities.9. Volume and weight: Due to the limitations of installation space and transportation conditions, in places with limited space, such as box-type substations, small distribution rooms, etc., it is necessary to choose transformers with small size and light weight, such as dry-type transformers or some specially designed compact transformers.10. Price and maintenance cost: Considering the purchase cost and the long-term maintenance cost, the prices of transformers of different brands, specifications and technical parameters vary greatly. At the same time, the maintenance costs of oil-immersed transformers and dry-type transformers are also different, and a comprehensive economic evaluation is required.
2025-02-19
What are four types of transformers?
What are four types of transformers?
Basic knowledge of electricity: Analysis of four common transformer types and their application scenarios Transformers are indispensable core equipment in modern power systems, used to regulate voltage, transmit energy, and ensure stable power supply. According to different functions and applications, transformers are mainly divided into the following four types: Power transformers: used in high-voltage transmission systems to connect power stations and transmission lines. Distribution transformers: installed in residential or industrial areas, responsible for reducing high voltage to usable low voltage. Autotransformer: has a structure with some coils shared, small size, high efficiency, suitable for limited space occasions. Instrument transformers: including current transformers and voltage transformers, used for measurement and protection systems. Mastering these basic knowledge will help to more reasonably select and apply transformers and improve the efficiency and safety of power systems.
2025-06-27
Iron loss and copper loss of transformer
Iron loss and copper loss of transformer
Any electrical equipment will suffer losses during long-term operation, and power transformers are no exception. The losses of power transformers are mainly divided into copper loss and iron loss. Definition and Principle Copper plays an important role in transformers. Copper wires are usually used in transformer windings. The "copper loss" in the transformer is the loss caused by the copper wires. The "copper loss" of the transformer is also called load loss. The so-called load loss is a variable loss, which is variable. When the transformer is running under load, there will be resistance when the current passes through the wire, resulting in resistance loss. According to Joule's law, this resistance will generate Joule heat when the current flows through it, and the greater the current, the greater the power loss. Therefore, the resistance loss is proportional to the square of the current and has nothing to do with the voltage. It is precisely because it changes with the current that the copper loss (load loss) is a variable loss, and it is also the main loss in the operation of the transformer. Influencing factors Current size: As mentioned above, copper loss is proportional to the square of the current, so the current size is the key factor affecting copper loss.Winding resistance: The resistance of the winding directly affects the copper loss. The larger the resistance, the higher the copper loss. Number of coil layers: The more coil layers there are, the longer the path for the current to flow in the winding, and the resistance will increase accordingly, resulting in increased copper loss. Switching frequency: The effect of switching frequency on transformer copper loss is directly related to the distributed parameters and load characteristics of the transformer. When the load characteristics and distributed parameters are inductive, the copper loss decreases with the increase of switching frequency; when they are capacitive, the copper loss increases with the increase of switching frequency. Temperature influence: Load loss is also affected by the temperature of the transformer. At the same time, the leakage flux caused by the load current will generate eddy current loss in the winding and stray loss in the metal part outside the winding. Calculation method There are two calculation formulas1. Formula based on rated current and resistance:Copper loss (unit: kW) = I² × Rc × ΔtWhere I is the rated current of the transformer, Rc is the resistance of the copper conductor, and Δt is the operating time of the transformer.2. Formula based on rated current and total copper resistance: Copper loss = I² × RWhere I represents the rated current of the transformer, and R represents the total copper resistance of the transformer. The total copper resistance R of the transformer can be calculated by the following formula: R = (R1 + R2) / 2Where R1 represents the primary copper resistance of the transformer, and R2 represents the secondary copper resistance of the transformer. Methods to reduce copper loss Increase the winding cross-sectional area of the transformer: reduce the conductor resistance, thereby effectively reducing the copper loss of the transformer. Use high-quality conductor materials: such as copper foil or aluminum foil to reduce winding resistance. Reduce the light-load operation time of the transformer: limit the proportion of the time when the transformer is light-loaded, which is conducive to reducing the copper loss of the transformer.
2025-04-09
Siemens to produce large power transformers in U.S. by 2027
Siemens to produce large power transformers in U.S. by 2027
Siemens Energy expects to start making large industrial power transformers in the U.S. in 2027 and could further expand its Charlotte plant if demand and import tariffs remain high, senior executives said. Siemens Energy, which gets more than a fifth of its sales in the U.S. and has about 12% of its roughly 100,000 employees in the U.S., has several plants making wind and gas turbines as well as grid components. Overall, more than 80% of so-called large power transformers (LPTs) -- bus-sized components needed to convert grid transmission voltage levels -- are currently imported into the U.S., said Tim Holt, a Siemens Energy board member. That’s why Siemens Energy is expanding its plant in Charlotte, North Carolina, with the first local LPTs expected to roll off the factory line in early 2027, Holt said, adding that there is plenty of room for further expansion if needed. The company expects total investment in the outdated U.S. grid to reach $2 trillion by 2050, as power demand is expected to surge thanks to data centers needed for artificial intelligence technology. “This time, we expect the boom cycle for grid expansion to be longer than the usual two to three years. The market is very optimistic now,” Holt, who runs Siemens Energy’s U.S. business, said at a company event. Maria Ferraro, finance chief at Siemens Energy, said the group was taking a medium- to long-term view on the U.S. market, where some companies are rethinking their footprint in the wake of U.S. President Donald Trump’s trade war. “Will we change our strategy or the way we approach the U.S.? I would say no, because we already have a long-term foundation there and it’s a key market for us,” Ferraro said. Siemens Energy said in May it expected U.S. import tariffs to reduce group net profit by less than 100 million euros ($117 million) in 2025 after Trump threatened to impose 50% tariffs on EU goods if no deal was reached by July 9. “Any significant change in tariffs would also mean we review our estimated impact,” Ferraro said.
2025-01-01
2025 China Power Transformer Overseas and Intelligent Manufacturing Technology Conference concluded successfully!
2025 China Power Transformer Overseas and Intelligent Manufacturing Technology Conference concluded successfully!
April 28-29, 2025 Wuxi, Jiangsu The "2025 China Power Transformer Overseas and Intelligent Manufacturing Technology Conference" hosted by Shanghai Mogen Enterprise Management Consulting Co., Ltd. was successfully held at Wuxi Xizhou Garden Hotel from April 28 to 29, 2025. This conference brings together top industry scholars, industry leaders, investment institutions and policy makers. It will conduct in-depth discussions on core areas such as transformer overseas expansion and intelligent manufacturing, injecting new impetus into the coordinated development of the power transformer industry. The technological progress and innovation of China's transformer industry cannot be separated from the continuous and in-depth exchanges and cooperation between enterprises and industry elites. As an important industry exchange event, the 2025 China Power Transformer Overseas and Intelligent Manufacturing Technology Conference not only played an important role in promoting industrial technology cooperation and exchanges, and transformer enterprises going overseas, but also effectively accelerated the supply and demand docking and cooperation process in the upstream and downstream of the transformer industry chain.
2024-12-28
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