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China Suppliers Factory Intermediate Frequency Furnace Capacitor with Water Cooling System and High Efficiency Design
Medium Frequency Capacitors for smelting furnace
Applications
- Induction furnaces and heaters
- Improve power factor
- Tune special furnace circuits
General Technical Spec
Flair water-cooled capacitors applied for all-film structure, with folded aluminum foil/film and non biodegradable non PCB high insulation immersion agents added as the main raw materials for production.
| Max rated Voltage range | 8000V |
| Rated Frequency | 50Hz~300Khz |
| Max Rated capacity | 15000Kvar |
| Dielectric | water-cooled all-film technology |
| Impregnating compound | high quality liquid biodegradable (Non polychlorodiphenyls) |
| Nos of Terminals | Custom-design |
| Temperature category | -25℃ - 50℃ |
| Case material | Aluminum alloy/stainless steel |
| Cooling method | Water cooling/forced ventilation cooling/natural cooling |
| Protection design | pressure switch |
| Case | insulation or non-insulation |
| Mounting | Upright or horizontally position (indoor) |
Design and characteristics of water cooled capacitors
In high-current and high-frequency applications, film/foil, metallized film water cooled capacitors are used for a wide range of induction heating, including filtering and tank circuit applications. The design of these capacitors makes them suitable for high-power, high-current, and high-frequency, such as broadcast transmitter, induction heating, melting, and high-frequency welding systems.
Using sets of small capacitors helps to distribute the heat generated by capacitors. The small capacitors are commonly used in power electronic circuits. Although this solution helps in thermal management, it is not a suitable option for applications with limited space. Capacitors with integrated water cooling systems are suitable for such applications. Using water-cooled capacitors also helps to reduce the cost and the number of capacitor components used.
Film and ceramic capacitors with integrated liquid cooling systems are increasingly becoming popular for high-current applications. The liquids that are commonly used in such systems are water, a mixture of water and chemical solutions, and de-ionized water. Liquid-cooled capacitors are a suitable choice for power electronic circuits with high energy densities. This cooling method is suitable for applications where the ambient temperature does not exceed the value 50℃ with common design.
Induction heating capacitor Working Conditions
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The capacitors are advised to be installed where has no violent mechanical vibration, no harmful gas/steam emission, no electrical conductivity, non-explosive dust.
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Environment temperature between -25℃ - 50℃.
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Better non-suspended installation.
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The inlet temperature of the cooling water shall not exceed 35℃, and the outlet temperature of the cooling water shall not exceed 45℃.
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The maximum allowable reverse voltage shall not exceed 1.05 times, and the maximum allowable current shall not exceed 1.15 times.
Capacitor maintenance notes
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The capacitor must be discharged with shorting stub, if you want to touch the capacitor after the machine being turned off. In case the residual voltage hurt you.
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The frozen cooling water will cause capacitor fault, so please make sure no water left inside when the capacitors are not working. And prevent the cooling water from freezing under 0℃.
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Clean the ceramic terminals in regular to avoid creepage and short out.
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The thermal changes (expand with heat and contract with cold) will cause the screws loosed. So it is necessary to check on the screws each time when the machine shut down.
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All metal accessories which to be connected to capacitors must be H62 or T2 Copper.
Don’t touch the ceramic terminals during the transportation.
Frequency Of Induction Heat Treatment
- Intermediate Frequency: 500～20000HZ usually use 1000~8000HZ
- High frequency: 100～500KHZ, usually use 200～300KHZ
- Ultrasonic frequency: 30～80KHZ, usually use 30～40KHZ
- Line frequency: 50hz, 60hz
The medium frequency induction heating treatment
The current frequency of the medium frequency induction heating device is usually 500hz ~ 10000HZ. It is suitable for the surface quenching of steel parts with a heating layer depth of 3 ~ 16mm and a large workpiece diameter (20 ~ 500mm), and can also be used for tempering, normalizing, forging billet diheat or melting metal. In the automobile and tractor manufacturing industry, the surface quenching of crankshaft and camshaft parts is mostly heated by medium frequency equipments.
The medium frequency power supply of the medium frequency induction heating device has two kinds: medium frequency generator (machine type medium frequency power supply) and thyristor medium frequency power supply.
Working principle of water cooled capacitors in induction heating equipment
Water cooled induction heating uses an alternating magnetic field to generate induced current in a metal conductor, especially in the induction coil and power supply section, and converts this energy into thermal energy to achieve rapid heating. Its main working principle is as follows:
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When an alternating magnetic field acts on a metal conductor, it will generate induced current in the conductor;
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Induced current generates resistance in a conductor, converting electrical energy into thermal energy;
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Through the heat dissipation of the water cooling system, heat is taken away to ensure that it will not overheat during the heating process;
How we make induction heating capacitors?
Frequently Asked Questions (FAQ)
Q1: What are the main applications of Medium Frequency Capacitors?
A1: These capacitors are widely used in induction furnaces and heaters, to improve the power factor of electrical installations, and to tune special furnace circuits for optimal performance.
Q2: What is the recommended operating temperature range for these capacitors?
A2: The ambient environment temperature should be maintained between -25℃ and 50℃. For the cooling system, the inlet water temperature should not exceed 35℃, and the outlet water temperature must remain below 45℃.
Q3: Why is water cooling preferred over natural cooling in high-power applications?
A3: Integrated water cooling systems efficiently dissipate high heat generated in limited spaces. This design allows for higher energy densities, reduces overall costs, and minimizes the physical footprint compared to using multiple smaller capacitors.
Q4: What maintenance steps are critical for preventing capacitor failure?
A4: Essential steps include discharging the capacitor with a shorting stub before handling, ensuring all cooling water is fully drained when not operating to prevent freezing below 0℃, regularly cleaning ceramic terminals, and checking for loose screws after machine shutdowns.
Q5: What are the frequency classifications for induction heat treatments?
A5: The treatments are classified as Line frequency (50Hz/60Hz), Intermediate frequency (500Hz–20,000Hz), Ultrasonic frequency (30kHz–80kHz), and High frequency (100kHz–500kHz).
Q6: What materials must be used for metal connections to the capacitors?
A6: To ensure proper electrical conductivity and prevent thermal damage, all metal accessories connected to the capacitors must be made of H62 or T2 Copper.