Auto Transformer Starter – A one stop solution to start large electric motors to minimize the electrical network and starting current.
ATS addresses all needs of large motors in different industrial settings. So, this blog covers the concept of the Auto Transformer Starter, its functions, working and role of transformer companies to provide ATS solutions.
Introduction to an Auto Transformer Starter
An Auto Transformer Starter (ATS) is a solution designed to reduce starting current while starting an induction motor. An auto transformer connected in series with the motor in it is designed to reduce the motor voltage. This transformer helps in a lower inrush current for high-power motors.
Induction motors with large ratings can draw their rated current at startup that can result in problems like voltage sags in the power network, tripping of circuit breakers and mechanical stress on the motor. In this case, ATS is helpful which is designed to reduce the voltage applied to the motor during startup. As a result, the auto transformer disconnects automatically once the motor reaches a certain speed. Then the motor gets powered at full voltage for normal operation.
Components of an Auto Transformer Starter (ATS)
Here is a list of components of an Auto Transformer Starter:
- Auto Transformer: As the primary component of the ATS, this auto transformer reduces the voltage supplied to the motor at startup. The unique design of this transformer provides different taping points to reduce voltage to 50%, 33% or 25% of the motor’s rated voltage.
- Control Circuit: It controls the ATS sequencing including activation of the contactor and timing delays. Control circuit is used to ensure that the motor transitions from reduced voltage to full voltage smoothly.
- Overload Relay: This safety device is used to monitor the current in the motor and disconnect the motor in case of a fault or overload current. So, it helps to prevent potential damage to the motor.
- Starting Resistor: It is not necessarily in all designs. Some ATS systems use resistors to limit the initial current. This resistor helps to get a smoother transition when starting the motor.
- Contactor: It is used to control the electricity flow to the motor and auto transformer. The contactor can help to switch the motor’s supply from the reduced voltage to the full voltage after the motor has started.
How an Auto Transformer Starter works:
Here are the steps involved in the operation of an Auto Transformer Starter:
- Initial Connection: When you power on the motor, the Auto Transformer is connected in series with the motor that helps in delivering a reduced voltage to the motor. It helps to limit the current drawn by the motor at startup.
- Current Reduction: Starting current of the motor gets reduced just by applying a portion of the full voltage. It helps to reduce the stress on both the electrical supply network and the motor. This reduction results in a starting current that is about one-third to one-half of the motor’s rated full load current.
- Transition to full voltage: Once the motor reaches around 70-80% of full speed, the auto transformer is disconnected from the circuit. Then, the motor is switched to full voltage at its full operating capacity.
- Normal Operation: The auto transformer is no longer needed in case the motor is running at full speed. The system runs in the same manner as a standard direct-on-line (DOL) starter.
This inrush current reducing process minimizes the electrical stresses on both the motor and the power system.
Advantages of using an Auto Transformer Starter
- Reduced Starting Current
- Protection for the Motor
- Cost-effective Solution
- Energy Efficiency
- Protection for the Electrical Network
- Versatility
Disadvantages of Auto Transformer Starter:
The ATS offers many benefits with some drawbacks:
- Cost of the Transformer
- Power Loss in Transformer
- Limited Starting Torque
Applications of Auto Transformer Starter
ATS is used in industries that require high-power motors to run large equipment. These applications include:
- Pumps and Fans
- Conveyors
- Compressors
- Crushers and Mills
How to choose the right Transformer Manufacturers and Companies for ATS
It is very important to ensure that the Transformer manufacturers and transformer companies you choose are reliable and safe. You should consider following factors to choose a manufacturer:
- Experience and Reputation
- After-Sales Support
- Compliance with Standards
- Customization Options
Conclusion: If you are looking for an ATS solution, then go for a reliable and experienced transformer manufacturer to ensure the longevity of the equipment. At triotransformer.com, their expert team ensures that the products are designed to perform at optimal efficiency while maintaining safety standards. Choose such trusted companies to get assurance that your motor starting needs will be met with care and professionalism.
