Variac
Your Professional Variac Supplier
Noyark is a world leader in power supply systems and has been developing AC and DC power supplies based on the core technology of power conversion. We provide advanced, reliable and cost effective power products.
Why choose us
Long Warranty
Unlike most competitors offering only 1-year warranty, we provide 2-year standard coverage.
Sales Market
Our products are exported to Russia, India, Southeast Asia, and Africa, and have received high praise from local customers.
OEM Service
As your global production partner, we accept small orders and provide customized Logo and packaging services, supporting printing or laser engraving to make your products more personalized.
Production Guarantee
We have several automated production lines to ensure efficient production and meet the demand for large quantities. All products are quality certified to ensure qualified and reliable.
Specifications
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Model |
TDGC2 (J), T(N)DJA, T(E)DGZ |
TSGC2 (J), T(N)SJA, T(E)SGZ |
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Rated Power |
≥200VA, customer to specify |
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Input Voltage |
220VAC, or customer to specify |
380VAC, or customer to specify |
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Output Voltage Range |
0-250VAC, or customer to specify |
0-430VAC, or customer to specify |
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Phase Number |
Single |
Three |
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Waveform Distortion |
Nil |
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Adjustment Method |
Manual or Motorized |
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Display |
Analog, LED, LCD or Multifunctional Meter |
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Working Frequency |
50/60Hz |
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Insulation Class |
B |
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Ambient Temperature |
-10℃ to +45℃ |
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Relative Humidity |
≤95% (non-condensing) |
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Efficiency |
≥90% |
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Duty Cycle |
Continuous |
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Ingress Protection |
IP20 Indoor (outdoor optional) |
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Key Characteristics and Parameters of Variac Transformer
Voltage Regulation: The primary characteristic of a Variac transformer is its ability to provide continuous voltage regulation. By adjusting the position of the brush or tap along the winding, the effective number of turns in the secondary winding changes, resulting in a corresponding change in the output voltage.
Input and Output Voltage Range: Variac transformers are typically designed to handle a specific input voltage range, such as 120V or 240V. The output voltage range can vary from zero to slightly above the input voltage, depending on the transformer’s design and winding configuration.
Current Capacity: The current capacity of a Variac transformer is determined by the cross-sectional area of the winding and the core material. It is essential to operate the transformer within its rated current capacity to prevent overheating and potential damage.
Efficiency and Power Loss: Like other transformers, Variac transformers are subject to power losses due to winding resistance, core losses, and stray losses. The efficiency of a Variac transformer is typically lower than that of a conventional transformer due to the additional losses associated with the variable winding configuration.
Insulation and Dielectric Strength: Variac transformers must be designed with adequate insulation and dielectric strength to withstand the voltage stresses between the winding turns and the core. This is particularly important when operating at higher voltages or in harsh environments.
Mechanical Construction: The mechanical construction of a Variac transformer plays a crucial role in its performance and durability. The brush or tap mechanism must be designed to ensure smooth and reliable operation, while the winding and core assembly should be robust and resistant to vibrations and environmental factors.
Advantages of Variac transformers include:
Precise voltage control and adjustment
Simple and compact design.
High efficiency due to the single-winding and toroidal core design.
Wide range of applications, from laboratory testing to industrial processes.
Limitations of Variac transformers include:
Limited current handling capability compared to other types of transformers.
Potential for voltage drop under heavy loads due to the autotransformer design.
Susceptibility to external magnetic fields, which can affect the output voltage.
Limited voltage isolation between input and output, as they share a common winding.
Construction Features and Material Quality
The physical and electromagnetic design of the transformer directly affects performance, durability, and maintenance intervals. Key construction aspects include:
Core Material
High-grade grain-oriented silicon steel reduces hysteresis and eddy current losses, improving efficiency and reducing heat generation.
01
Winding Design
Copper windings are preferred for their superior conductivity and mechanical strength. Proper insulation and layering prevent short circuits and enhance thermal stability.
02
Insulation System
Class F (155°C) or Class H (180°C) insulation allows higher operating temperatures and longer life. Vacuum pressure impregnation (VPI) improves moisture resistance and dielectric strength.
03
Cooling Method
Oil-immersed units offer better heat dissipation for continuous duty, while dry-type transformers are safer for indoor installations due to non-flammable construction.
04
Enclosure
NEMA-rated enclosures (e.g., NEMA 3R for outdoor use) protect against dust, moisture, and physical damage.
05
How Variac Transformer Works
The Variac transformer operates on the principle of electromagnetic induction. It has a single tapped winding wound on a toroidal core. By rotating the winding relative to the core, the number of turns linked with the magnetic flux can be varied, thereby changing the output voltage. This allows for a smooth and continuous adjustment of the output voltage from zero to the maximum value.
Packaging & Shipping
Packaging:
Small capacity products (Automatic Voltage Regulators/Stabilizers), colour box as inner package and cardboard carton as outer package.
Big capacity products, we use strong plywood case.
Company Honor
