OEM manufacturer custom KYN61-40.5 Metal Armored Removable Switchgear for Greek Manufacturer
Exterior and dimensions
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KYN61-40.5 is the 35KV class switchgear that is developed by bringing in the foreign technology. It is in line with GB3906, IEC-298, DL404 and other standards. It is applicable to the system of three-phase AC 50Hz, rated voltage 40.5KV for the use of power plant area, substation and large industrial mining enterprises to accept and distribute the electric power. It can control, protect and detect the line.
This video describes, in detail, how to construct a Current Limiting Device to protect you, your test equipment, and any electronic gear that you are testing or repairing. When used properly, it prevents short circuits from causing additional damage, particularly to expensive power transformers in amplifiers. It is also quite useful when first powering up previously untested and vintage equipment. It is not suitable for use with medium to large electric motors.
The bulb functions as a high-wattage resistor in which the resistance increases with the increasing heat of the filament. A “cold” bulb may offer only 2 or 3 ohms of resistance (the higher the wattage, the lower the resistance), but this will rapidly rise as the filament heats, particularly in the case of a short circuit…..protecting the circuit and dissipating the resulting filament heat in the form of light (warning you of the existence of the short).
IMPORTANT NOTE: The wattage of the bulb must be tailored to the current draw of the device being protected. The high-wattage bulbs (200W+) recommended in the video are primarily for Tube Amplifiers, which operate at relatively high current levels. With lower-current devices, such as Solid State amps, a lower wattage-higher resistance bulb (even as low as 40W) may be required for circuit protection.
For viewers in areas with 220-240VAC power: Although your voltage is double (220VAC vs 110VAC), your current flow is about half. Since the Current Limiter (CL) depends on current to rapidly heat the filament and increase its resistance, you need a bulb with higher filament resistance. Since the filament resistance of the bulb decreases with higher wattage, you should try a lower wattage, higher resistance bulb…..i.e. a 100W……initially, and then fine tune the wattage depending upon the power demands of the amplifier being protected.
The Photoflood Bulb used in this video is available on Amazon. Here is a link: http://www.amazon.com/Eiko-Supreme-Photoflood-Light-Bulb/dp/B000TZQUF0
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