I. Nature of the corona phenomenon: Why must high-voltage power systems pay attention to Corona?
Corona Discharge is an invisible but devastating physical phenomenon in high-voltage power systems.When the electric field strength on the surface of the wire exceeds the breakdown strength of the air (about 3 kV/mm at standard atmospheric pressure), the air molecules are ionized, producing a blue-violet glow, ozone, ultraviolet rays, and accompanied by a harsh “bang” sound.This phenomenon is common in AC systems above 1 kV, and the higher the voltage level, the more violent the corona.
1.1 Three hazards of corona discharge
1.2 In which scenarios does the corona occur at high frequencies?
- VFD : PWM waveform produces dv/dt pulses up to 10 kV/μs, causing reflected overvoltage at the winding end
- High voltage transformer : winding head end above voltage class 10 kV, 35 kV, 110 kV
- High-voltage motors : large motor stator windings with voltage levels of 6 kV and 10 kV
- Wind power generation : double feed asynchronous generator rotor slip ring brush area
- High-speed rail traction motor : frequent start/braking, sharp change in electrical stress
- Reactor, transformer : continuous high voltage operation
1.3 Corona versus Partial Discharge (PD)
Corona is a special form of Partial Discharge (PD).PD includes internal discharge (insulating internal air gap), surface discharge (insulating surface), corona discharge (gas medium).In the enameled wire application, corona discharge mainly occurs on the surface of the wire or the interface between the paint film and air , so the corona resistance of the enameled wire paint film is the highest.
II. International standard system for corona-resistant enameled wires: IEC/NEMA/ASTM
2.1 IEC 60317 series (Europe/Asia mainstream)
IEC 60317 is a series of standards issued by the International Electrotechnical Commission for enameled wires.Key components related to corona resistance include:
| Standard Number | Name | Film Type | Temperature Rating |
|---|---|---|---|
| IEC 60317-0-1 | General requirements | All | All |
| IEC 60317-8 | Polyesterimide Enameled Round Copper Wire | PEI | 180°C (Class H) |
| IEC 60317-13 | Polyester Enameled Round Copper Wire | PE | 155°C (Class F) |
| IEC 60317-15 | Polyesterimide Enameled Round Aluminum Wire | PEI-Al | 180°C (Class H) |
| IEC 60317-42 | Corona-resistant enamelled round copper wire | PEI + corona-resistant coating | 180°C |
| IEC 60317-56 | Corona-resistant enameled round copper wire (high frequency) | PI + corona-resistant coating | 220°C |
2.2 NEMA MW 1000 (North American market)
NEMA MW 1000-2018 Magnet Wire classifies enameled round copper wires by temperature class and film type.Corona-resistant enameled wires are often categorized as:
- MW 35-C : Corona-Resistant Polyesterimide
- MW 36-A : Corona-Resistant Polyamide-imide
- MW 38-C : Corona-Resistant Polyimide
2.3 GB/T 6109 (China National Standard)
GB/T 6109 is equivalent to IEC 60317 series.Among them, the parts related to corona resistance:
- GB/T 6109.20-2008: Grade 155 polyamideimide enameled copper round wire
- GB/T 6109.22-2008: 240 grade polyimide enameled copper round wire
2.4 ASTM D2275/D1868 (Corona Resistance Test Method)
- ASTM D2275 : Standard Test Method for Voltage Endurance of Film-Insulated Round Magnet Wire
- ASTM D1868 : Standard Test Method for Detection and Measurement of Partial Discharge (Corona) Pulses
2.5 Key Certification Bodies
| Certification Body | Logo | Key Markets | Corona Resistance Testing Standards |
|---|---|---|---|
| UL (US Underwriters Laboratory) | UL | North America | UL 1446/UL 1581 |
| VDE | VDE | Europe | VDE0470/DIN EN 60317 |
| TÜV (Technical Supervisory Association of Germany) | TÜV | Europe/Global | TÜV 2 PfG 1160 |
| CCC (China Compulsory Certification) | CCC | China | GB/T 6109 |
| CSA (Canadian Standards Association) | CSA | Canada | CSA C22.2 No. 0 |
III. Core components of corona-resistant paint films: nano-inorganic fillers and polymer matrices
3.1 Double-layer structure design of paint film
Modern corona-resistant enameled wires are usually “double-layer” or “gradient”:
| Layer | Composition | Thickness | Action |
|---|---|---|---|
| Inner layer (substrate) | PEI/Pai/PI | 30-50 μm | Provides mechanical strength, adhesion and base insulation |
| Outer layer (corona-resistant layer) | Matrix + nano TiO ₂/Al ₂ O ²/SiO ₂ | 5-15 μm | Absorbs corona energy, blocks high-energy electrons |
3.2 Common nano-fillers and their mechanisms of action
| Filler type | Particle size | Content | Mechanism of action | Typical application |
|---|---|---|---|---|
| Nano TiO ₂ | 20-50 nm | 5-15 wt % | High dielectric constant (~ 100), dispersed electric field | Inverter motor |
| Nano Al ₂ O ² | 30-80 nm | 8-20 wt % | High thermal conductivity (30 W/m · K), reduced discharge point temperature rise | High voltage motors |
| Nano-SiO ₂ | 10-30 nm | 3-10 wt % | Adsorption of ozone to prevent degradation of paint film | High voltage transformer |
| Boron nitride (BN) | 50-100 nm | 5-12 wt % | Ultra-high thermal conductivity (60 W/m · K), high insulation | High-end inverter motor |
3.3 Why are “inorganic fillers” resistant to corona?
The high-energy electron energy generated by corona discharge is about 2-10 eV, which is much higher than the C-C bond and C-H bond energy (3-5 eV) of organic paint film molecules.In pure organic paint films, these bonds are broken directly, resulting in degradation of the paint film.
Corona-resistant mechanism of nano-inorganic fillers :
1. Dispersion electric field : TiO ₂ with high dielectric constant forms “microelectrodes” in the paint film, so that the originally concentrated electric field is dispersed into multiple micro-regions
2. Absorption of energy : The bond energy (> 10 eV) of inorganic materials is much higher than that of organic materials and can absorb high-energy electron energy without degradation
3. Heat conduction and heat dissipation : The high thermal conductivity of Al ₂ O ² and BN quickly takes away the heat from the discharge point to avoid local overheating.
4. Blocking path : Inorganic particles form a “maze structure” in the paint film to extend the discharge path
IV. ASTM D2275 Voltage Durability Test: Core Assessment of Corona Resistance
4.1 Test principle
ASTM D2275 is the core test method for corona-resistant enameled wires.The principle is: Take a sample of enameled wire, apply a power frequency AC voltage (usually 1.2-3 kV) higher than the rated operating voltage, and record the time required for the film to break down (short circuit).Corona life is measured in “hours” or “minutes”.
4.2 Test parameters
| Parameters | Typicals | Description |
|---|---|---|
| Test Voltage | 1.2-3.0 kV | Much higher than rated voltage, accelerated aging |
| Frequency | 50/60 Hz | Power Frequency |
| Temperature | 155-180°C | Simulated Actual Operating Temperature |
| Electrode form | Twisted Pair | IEC 60851-5 specification |
| Failure Criteria | Paint Film Breakdown (Short Circuit) | Sudden Current Increase |
| Typical lifetime | 50-500 h | Corona-resistant enameled wire |
4.3 Comparison with ASTM D2307 Aging Test
| Dimension | ASTM D2275 Corona Resistance | ASTM D2307 Thermal Aging |
|---|---|---|
| Main Stress | Voltage (electric field) | Temperature (thermal) |
| Failure Mechanism | Film Electrochemical Corrosion | Film Thermal Oxidative Degradation |
| Acceleration Conditions | High Voltage | High Temperature |
| Typical lifetime | 50-500 h | 1,000-20,000 h |
| Main Applications | Inverter Motors, High Voltage Motors | All Enameled Wires |
4.4 Interpretation of test results
- Life > 200 h : Excellent corona resistance for high-voltage motors, inverter motors
- Life 100-200 h : Good corona resistance for general industrial motors
- Lifetime 50-100 h : Basic corona resistance for low-voltage frequency conversion
- Lifetime < 50 h : Not recommended for corona environments
V. Corona resistance under PWM pulse voltage: special evaluation for variable frequency motors
5.1 Electrical stress characteristics of PWM waveforms
Modern frequency converters use PWM (pulse width modulation) technology, and the output voltage waveform is not a sine wave, but a high-frequency pulse sequence.The impact of this waveform on enameled wire insulation is much greater than the power frequency sine wave:
| Parameters | Power Frequency Sine | PWM Pulse |
|---|---|---|
| dv/dt | 0.01 kV/μs | 1-10 kV/μs |
| Peak voltage | 1.0 pu | 1.5-2.0 pu (voltage reflection) |
| Pulse Frequency | 50/60 Hz | 2-20 kHz |
| Harmonic content | Low | Rich (hundreds of harmonics) |
5.2 Voltage reflection and “overvoltage”
When the PWM pulse propagates in the winding, a voltage reflection occurs due to a mismatch between the winding inductance and the parasitic capacitance.Voltage reflection causes the actual voltage at the end of the winding (especially the first turn) to reach 2 times the DC bus voltage.This is why the first turn of the inverter motor winding is most susceptible to corona breakdown.
5.3 Special requirements for enameled wires for inverter motors
- Thicker paint film : Grade 2 or Grade 3 (IEC 60317 paint film grade)
- Lower dielectric loss tangent (tan δ) : < 0.01 @ 1 kHz
- Higher corona life : > 100 h @ 2 kV, 50 Hz
- Smaller film defects : pinhole count < 5/100m
- More flexible paint film : resistant to bending cracks for high-speed winding
VI. Typical Application Cases: Engineering Practice of Corona Resistant Enameled Wire in 5 Major Areas
6.1 Case 1: New energy vehicle drive motor
A new energy vehicle manufacturer uses a 160 kW permanent magnet synchronous motor with an 800 V high-voltage platform.The original design used ordinary PEI enameled wire, and corona corrosion occurred after 3,000 hours of operation.Then switch to corona-resistant PEI enameled wire (nano TiO ₂ coating) and run for 20,000 hours without corona failure.
6.2 Case 2: High-speed rail traction motor
CRH380A high-speed rail traction motor power 600 kW, voltage 2.8 kV, frequency 200 Hz.Corona-resistant PI enameled wire according to IEC 60317-56 with an operating life of more than 20 years.
6.3 Case 3: Wind turbines
A 3 MW double-fed asynchronous wind turbine, the slip ring brush area uses corona-resistant enameled wires.Corona corrosion occurred in the ordinary enameled wire for 6 months, and the corona-resistant enameled wire was used for more than 5 years without abnormality.
6.4 Case 4: Industrial high-voltage motors
A chemical enterprise 6 kV high-voltage motor, 600 kW.The annual insulation failure rate decreased from 8% to 0.5% after switching to NEMA MW 35-C corona-resistant enameled wire.
6.5 Case 5: Photovoltaic inverter transformer
A 100 kW photovoltaic inverter high-frequency transformer with a frequency of 20 kHz and a voltage of 1.2 kV.After using corona-resistant PI enameled wire, the efficiency is maintained above 98.5% and the temperature rise is reduced by 15°C.
VII. 5 major engineering suggestions for the selection of corona-resistant enameled wires
7.1 Recommendation 1: Selection based on voltage level
| Operating Voltage | Recommended Corona Resistance Rating | Film Thickness | Standard |
|---|---|---|---|
| < 1 kV | No special corona resistance required | Grade 1 | IEC 60317-8/13 |
| 1-3 kV | Basic corona resistance | Grade 2 | IEC 60317-42/NEMA MW 35-C |
| 3-10 kV | Enhanced corona resistance | Grade 3 | IEC 60317-56/NEMA MW 36-A |
| > 10 kV | Top Corona Resistance | Grade 3 + Shielding | Customized Solutions |
7.2 Recommendation 2: Selection based on frequency and dv/dt
- 50/60 Hz power frequency : normal PEI enameled wire is enough
- PWM inverter (dv/dt > 1 kV/μs) : Corona resistant enameled wire must be used
- High frequency (> 1 kHz) : use low dielectric loss PI enameled wire
- UHF (> 100 kHz) : Consider Litz Wire
7.3 Recommendation 3: Selection based on temperature level
| Temperature Rating | Recommended Paint Film | Typical Applications |
|---|---|---|
| Class 130 (130°C) | PU + corona resistant coating | Small appliance motors |
| Class 155 (155°C) | PE + corona resistant coating | General industrial motors |
| Class 180 (180°C) | PEI + corona resistant coating (IEC 60317-42) | Frequency conversion motors, NEVs |
| Class 200 (200°C) | Pai + corona resistant coating | High voltage motors |
| Class 220 (220°C) | PI + corona resistant coating (IEC 60317-56) | Traction motors, rail transit |
7.4 Recommendation 4: Pay attention to the “four tolerances” of the paint film
- Corona resistance : ASTM D2275 lifetime > 100h
- Heat resistant : ASTM D2307 life > 20,000 h @ temperature class
- Pulse resistance : IEEE 1043/IEC 60851-5 pulse test
- Chemical resistance : Impregnation resistant paints, refrigerants, oils
7.5 Recommendation 5: Pay attention to the impact of manufacturing processes
- Paint uniformity : Paint film thickness tolerance < ± 2 μm
- Curing degree : Curing degree > 95% (DSC test)
- Pinhole control : number of pinholes < 5/100m (wet test)
- Adhesion : winding test without cracking (IEC 60851-3)
VIII. FAQ: Common problems with corona-resistant enameled wires
8.1 How much is the price difference between corona-resistant enameled wire and regular enameled wire?
Generally, corona-resistant enameled wire is 30-100% more expensive than ordinary enameled wire.However, considering that the service life is prolonged, the failure rate is reduced, and the cost performance is much higher than that of ordinary enameled wire.
8.2 Can corona-resistant enameled wire replace ordinary enameled wire?
Yes, but the cost goes up.Unnecessary in low-voltage, low-frequency, corona-free applications.
8.3 Are the nanoparticles in the paint film environmentally friendly?
The mainstream TiO2, Al2O2 and SiO2 are non-toxic inorganic materials.Nanoparticles are present in the form of “embeddings” in the paint film and are not released.Dust protection during production is necessary.
8.4 How do I know if an enameled wire is truly “corona resistant”?
The most reliable method is to test the life of the paint film according to ASTM D2275, requiring the supplier to provide a test report.
8.5 What are the special requirements for the storage of corona-resistant enameled wires?
At room temperature, dry and out of direct sunlight.Shelf life is usually 12 months.It should be used as soon as possible after opening.
IX. Future Trends: Development Direction of Corona Resistant Enameled Wire Technology
9.1 Trend 1: Increasing voltage levels
With the development of the 800V platform for new energy vehicles, 25 kV traction for high-speed railways, and 1100 kV UHV for power grids, the voltage level of corona-resistant enameled wires is becoming more and more demanding.
9.2 Trend 2: High frequency with wide bandgap semiconductors
SiC and GaN power devices make the frequency converter switching frequency above 100 kHz, dv/dt > 50 kV/μs, posing an extreme challenge to enameled wire insulation.
9.3 Trend 3: New filler technology
- Graphene : Super high thermal conductivity, controllable electrical conductivity
- MXene 2D material : adjustable dielectric constant
- Boron nitride nanotubes (BNNTs) : ultra-high thermal conductivity + high insulation
9.4 Trend 4: Smart Manufacturing & Online Testing
- Online Corona Discharge Detection (PD Monitoring)
- AI Visual Inspection of Paint Film Thickness
- Digital traceability and full-life management
X. Conclusion: Corona-resistant enameled wire is the “invisible guardian” of high-voltage power systems
Although corona-resistant enameled wire accounts for only 1-3% of the total machine cost, it determines the life and reliability of motors, transformers, and inverters.In high-voltage power systems such as new energy vehicles, high-speed railways, wind power, photovoltaics, and ultra-high voltage, corona-resistant enameled wires are irreplaceable key materials.
When selecting models, the qualified products that comply with IEC 60317, NEMA MW 1000, and ASTM D2275 should be selected taking into account the voltage level, frequency, temperature, and application scenarios.Suppliers should provide complete test reports, certifications, and application cases to avoid “big breakdowns” due to “small savings”.
LP Winding Wire offers a full range of corona-resistant enameled wire products, including IEC 60317-42 (180°C PEI), IEC 60317-56 (220°C PI), NEMA MW 35-C, NEMA MW 36-A, NEMA MW 38-C, and more.All products are ASTM D2275, UL 1446, VDE, TÜV, CCC certified.For technical advice, sample testing, application design, please contact LP Winding Wire Sales Engineer.
XI. Deep Analysis: The Physical Mechanism of Corona Discharge
11.1 Townsend Ionization
The essence of corona discharge is an electron avalanche in a gas.When the electric field strength exceeds the critical value (about 3 kV/mm in air), a small number of high-energy electrons impinge on the air molecules, causing them to ionize to produce new electrons.The new electrons continue to impact, forming an “electronic avalanche”.The avalanche produced blue-violet glow, ultraviolet radiation, and ozone.
11.2 Surface charge accumulated on the surface of the paint film
When the enameled wire is working at AC voltage, the charge accumulated on the surface of the paint film produces the following effects:
– Charge injection : The metal electrode (copper conductor) injects electrons into the paint film through a quantum tunneling effect
– Charge migration : electrons migrate to the surface of the paint film under the action of an electric field
– Charge accumulation : reverse electric field distortion primary electric field distribution generated by surface charge
– Discharge trigger : When the surface electric field reaches the critical value, the trigger surface discharges
11.3 Relationship between corona energy density and film life
Studies have shown that the corona life of paint films is inversely proportional to the energy density of the corona:
L = K/(E ^ n)
where L is lifetime, E is electric field strength, and K and n are constants.This means:
– 1x more electric field strength and 2-5x less lifetime
– 1x thicker film, 2-3x longer life
This is why thick paint films (Grade 2/3) must be used for high pressure applications.
XII. Production process and quality control of corona-resistant enameled wire
12.1 Key Control Points for the Painting Process
| Process parameters | Typical values | Control accuracy | Impact on corona resistance |
|---|---|---|---|
| Lacquer Viscosity | 50-200 mPa · s | ± 5% | Affects film thickness uniformity |
| Number of paint tracks | 4-12 tracks | ± 1 track | Determining the number of layers and total thickness of the paint film |
| Baking temperature | 350-450°C | ± 5°C | Affects cure |
| Baking time | 10-30 s/lane | ± 1 s | Affects cross-linking density |
| Linear Speed | 50-200 m/min | ± 2 m/min | Affects film thickness |
| Nanofiller dispersion | Uniform | Particle size < 100 nm | Corona resistance determined |
12.2 Online Quality Control
The modern corona-resistant enameled wire production line is equipped with a number of online quality controls:
– Paint film thickness online measurement : laser thickness gauge, accuracy ± 0.5 μm
– Pinhole online detection : High pressure wet electrode, pinhole > 0.05 mm alarm
– OD on-line measurement : Laser OD meter, accuracy ± 0.001 mm
– DC resistance on-line measurement : four-end method, accuracy 0.1%
12.3 Factory Quality Control
Each batch of corona-resistant enameled wire should pass the following tests before leaving the factory:
| Test Items | Criteria | Sampling Ratio | Eligibility Criteria |
|---|---|---|---|
| Breakdown Voltage | IEC 60851-5 | 100% | > Specified |
| Film continuity (pinholes) | IEC 60851-4 | 100% | < 5 pcs/100m |
| Corona Life Resistance | ASTM D2275 | Batch Sampling | > 100 h |
| Flexibility (Winding) | IEC 60851-3 | Batch Sampling | No Cracking |
| Thermal shock | IEC 60851-6 | Batch sampling | No cracking |
| Temperature Rating | ASTM D2307 | Model Year | 20,000 h |
XIII. Main international corona-resistant enameled wire suppliers
13.1 Top global brands
| Brands | HQ | Representative Products | Strengths |
|---|---|---|---|
| Essex Furukawa | USA/Japan | Magnet Wire HR200, HR240 | Global production, automotive certification |
| Sumitomo Electric | Japan | Excel-insul, e-3W | High-end inverter motors, rail transit |
| Hitachi Metals | Japan | CL-CABLE, F-CLASS | New Energy Vehicles, Wind Power |
| LS Cable | South Korea | Corona-Resistant Wire | High Voltage Motors, Industrial Applications |
| Superior Essex | United States | Thermal Class 200/240 | North American Dominance |
| Rea Magnet Wire | United States | Enamel Bond, Corona-X | Customized Solutions |
| LP Winding Wire | China | LNPU Series | Cost-effective, Customizable |
13.2 Top 5 Evaluation Elements for Selection of Suppliers
- Quality Certification : ISO 9001, IATF 16949 (Automotive), AS9100 (Aviation)
- Product Certification : UL, VDE, TÜV, CCC, CSA
- Test capability : own laboratory + third-party test report
- Application Experience : Similar Application Cases, Reference Customers
- Technical response : Fae support, customization capabilities
XIV.20 Glossary of Terms
14.2 Introducing LP Winding Wire
LP Winding Wire is an international enterprise specializing in the research and development, production and sales of high-performance enameled wires. Its main products include enameled round copper wires, enameled round aluminum wires, enameled flat copper wires, paper wires, glass fiber winding wires, transposition wires, etc.
Core strengths :
– Complete product certification : UL, VDE, TÜV, CCC, CSA full coverage
– Capacity scale : 50,000 tons per year, ranking first in the industry
– Application areas : motors, transformers, home appliances, new energy, rail transit, wind power, photovoltaics
– Core technologies : Corona-Resistant, High Temperature Resistant (200°C/220°C), New Energy Enameled
– Service Promise : Technical Consulting, Sample Testing, Customized Development, Global Logistics
14.3 Contact
- Official Website : https://www.lpwindingwire.com
- Email : sales@lpwindingwire.com
- Phone : +86 138-XXXX-XXXX
- WhatsApp : +86 138-XXXX-XXXX
XV. Engineer practical advice and common misunderstandings
15.1 3 Common Mistakes in Model Selection
Myth 1: Higher voltage levels are better
Many engineers believe that the higher the voltage level of the corona-resistant enameled wire, the better.In fact, over-design can lead to increased costs and process difficulties.The voltage rating should be selected according to 1.5-2 times the actual operating voltage.
Myth 2: Only the temperature level does not look at the corona resistance level
Class 180 enameled wire (PEI) and Class 180 corona resistant enameled wire (PEI + nano coating) are two completely different products.The latter must be selected for frequency conversion motors and high-voltage motors.
Myth 3: Ignore the impact of the PWM pulse voltage
Enameled wires with good withstand voltage at 50 Hz may break down within a few hours at PWM 1 kHz + dv/dt 10 kV/μs.Frequency conversion motors must use special corona-resistant enameled wires for PWM.
15.2 3 Common Problems in Manufacturing Processes
Question 1: Uneven film thickness
Uneven film thickness leads to local electric field concentration, causing corona.Control method: Use a high-precision lacquer applicator to ensure stable viscosity and uniform linear velocity of the lacquer liquid.
Question 2: Pinhole Excess
The pinhole is a minor defect in the paint film and is the starting point for corona discharge.Control method: Purify the paint environment, filter the paint liquor, and bake at a sufficient temperature.
Issue 3: Insufficient curing
Poor corona resistance of insufficiently cured paint films.Control method: ensure baking temperature, baking time, curing degree > 95%.
15.3 3 things to keep in mind
Note 1: Avoid mechanical damage
Avoid scratching and hitting the paint film during winding and embedding.Even with corona-resistant enameled wires, mechanical damage can significantly shorten life.
Note 2: Avoid chemical corrosion
Although the corona-resistant paint film has good chemical resistance, it should still avoid long-term contact with strong acids, strong bases, and organic solvents.
Note 3: Regular maintenance
For key equipment (such as high-speed rail traction motors, wind turbine main motors), it is recommended to conduct insulation testing every 2-3 years to detect early signs of corona in time.
15.4 Troubleshooting
| Fault Phenomena | Possible Causes | How to Handle |
|---|---|---|
| Partial discoloration of paint film | Early stage of corona discharge | Cleaning, checking electric field distribution |
| Powdering of paint film | Long-term corona corrosion | Replacement of enameled wire, change to corona resistance grade |
| Breakdown Short Circuit | Paint Film Completely Failure | Emergency Replacement, Tracing Reason |
| Increased dielectric loss | Paint film aging | Insulation testing, planned replacement |
15.5 Gap with international peers
The main gaps between China’s corona-resistant enameled wire and the top international brands (such as Essex Furukawa, Sumitomo, Hitachi) are:
– Nano filler dispersion technology
– Stability of high-volume production
– Long-term data accumulation in extreme conditions
However, Chinese manufacturers have significant advantages in terms of cost performance, customized services, and responsiveness.Leading companies such as LP Winding Wire have gradually narrowed the gap with international brands through continuous research and development.
XVI. Conclusion and outlook
As the “invisible guardian” of high-voltage power systems, the technical level and product quality of corona-resistant enameled wires directly affect the reliability and life of key equipment such as motors, transformers, and inverters.With the rapid development of high-voltage power systems such as 800V platforms for new energy vehicles, UHV power transmission, rail transit, wind power generation, and photovoltaic inverters, the market demand and technical requirements for corona-resistant enameled wires continue to increase.
When selecting corona-resistant enameled wires, comprehensive consideration should be given to voltage levels, frequency characteristics, temperature levels, application scenarios, certification standards, supplier strength and other factors to avoid falling into the misunderstanding of “only looking at the price and not looking at the performance”.LP Winding Wire is willing to work with customers around the world to promote the advancement and innovation of corona-resistant enameled wire technology.