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Toroidal Transformers, Toroidal Current Transformers, Transformers, Toroidal Power Transformers, Power Transformers, Current Transformers, Toroidal Cores for Transformers
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• Toroidal Current Transformers
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A toroidal transformer has ring type core made from cold rolled grain oriented ( CRGO ) Silicon steel strip without any joints and annealed for stress relief after being wound. These wound cores are then suitably insulated by class B insulation and the winding of copper wire is usually done by winding machines.
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The core being continuous, without any air gap and the path of flux being along the direction of grain orientation, gives an opportunity for optimum use of flux density, besides very low iron loss and exciting current. The primary and secondary windings are closely linked magnetically. Therefore the leakage fluxes and reactance are negligible.
A toroidal transformer has its winding spread over the entire periphery of the core. This results in largcr area for dissipating the heat. Till recently all such small low voltage type transformers needs were met almost universally by traditional or conventional El transformers. Now materials are easily available, so it has been possible to develop 'LOW VOLTAGE TOROIDAL TRANSFORMER' giving a whole set of advantages and wide range of applications in place of conventional transformers. |
Advantages Over Conventional Transformer ( EI Type )
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CUSTOM DESIGN FOR THE SPACE AVAILABLE: Since cores are manufactured in our own factory, it is possible to make a core of any diameter and height. |
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REDUCED REACTANCE: Isolation between primary and secondary easily feasible with class B insulation which results in reduced reactance. |
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LOW PRICE: Production techniques and more efficient design leading to cost effectiveness. |
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REDUCED TEMPERATURE RISE: Winding spread over the entire periphery of the core. This result in a larger area for dissipating the heat. |
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SMALLER SIZE AND WEIGHT: When used with a centering washer and screw / bolt, it becomes 40 % lighter and smaller. |
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LOW STRAY FIELD: Approximately 85-90 % lower than conventional transformers.Since toroids have no air gaps, primaries and secondaries are wound uniformly around the entire core resulting in toroid emitting very low radiated magnetic field. |
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NO INHERENT HUM / VIBRATION AND LOW NOISE: In toroid there is no air gaps and loose sheets of steel or lamination to cause vibration. Further copper winding are done on the above core so it almost completely eliminates the hum and noise. |
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EASE OF MOUNTING: Easy mounting by centering washer or Resin center potting with through hole and screw /bolt, or using bracket or combination of bracket and studs. |
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NEGLIGIBLE ' NO LOAD LOSS ' AND EXCITATION: In applications where a circuit is in a "stand - by mode" for a long period, the potential Cost reduction for power can be significant. Approximately 85 % at no load and 35 % under load condition. |
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SUITABLE FOR HIGHER FREQUENCY SUPPLY SYSTEMS. |
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HIGHER EFFICIENCY: All windings are symmetrically spread over the entire round gapless core, which gives an opportunity for higher use of flux density and reduced winding resistance, thus it achieves a very high electrical efficiency.
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MAGNETIC SHIELDING FEASIBLE
BETTER REGULATION
BETTER RELIABLITY |
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Due to constant attempt to improve the design and due to change in the quality of material available, the figures given above are for general guidance only and are subject to confirmation. |
Applications
Medical equipment, Audio / Video products , Motor control equipment, Lighting , Stabilized power supplies , Microprocessor based units, Battery chargers, Telecommunication products, Instrumentation, Computer and peripherals, CNC controlled machines , CRT, Robot equipment, Industrial Control Equipments, Office machines etc.
By considering above advantages, TOROIDAL TRANSFORMER is the one to be used in place of the old conventional type transformer.
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ADVICE NOTE :
Care must be taken when mounting a toroid to ensure that both ends of the fixing bolt must not be allowed to simultaneously come into contact with the metal chassis or framework, as this could act as a shorted turn.
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• Toroidal Power Transformers |
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Current transformers are used for electrical measuring instruments and / or electrical protective devices. They are very useful in high power circuits where the current is large. Current transformers are subdivided into two main categories.
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MEASURING CURRENT TRANSFORMER |
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PROTECTIVE CURRENT TRANSFORMERS |
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These transformers are used in measuring and indicating current, that is to reduce the line current to a value which is suitable for standard measuring instruments, relays etc. |
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These transformers are used for over current and undercurrent relaying for power circuit protection. |
TYPE : Current Transformers are normally categorized as Ring / Bar type and Wound Primary
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Ring / Bar type current transformer :
A current transformer where primary winding is provided by 'the user. |
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Wound primary current transformer
A current transformer having a primary winding of more than one full turn wound on core. |
Current Transformers are wound on Toroidal cores which virtually eliminates error due to leakage flux. Adjusting the number of secondary turns may compensate for some errors.
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Electrical Specifications :
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Type |
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Ring and wound type |
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Type. |
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Tape insulated ring type and Epoxy resin potting type. |
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Primary Current |
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50 Amp. To 3000 Amp. in Ring type, 25 Amp. To 600 Amp. in epoxy resin |
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Secondary Current |
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5 Amp. and 1 Amp. for Ring type, 0.2 , 0.1 and 0.05 Amp. for epoxy resin ( other on request) |
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Burden |
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5, 10, 15 VA. for Ring type, 0.25, 0.5, 1 and 2 VA. for epoxy resin type ( other on request) |
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Accuracy Class
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0.2, 0.5, 1.0, 5.0, 10.0 |
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Frequency |
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50 Hz |
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Operating Temp. |
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- 10 deg. C to 40 deg. C. |
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Conforms to |
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IS 2705 |
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The genral tolerance for dimensions +/- 3 mm
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We also manufacture non standard current transformer to meet the customers specification. Due to constant attempt to improve the design and due to change in the quality of material available, the figures given above are for general guidance only and are subject to confirmation. |
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