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Automatic Voltage Regulator (AVR)

A voltage regulator is a device designed to automatically maintain a constant voltage level which allows equipment to operate in a safer environment and having prolong lifespan.

KEBO has three types of voltage stabilizers: Relay Type, Servo Motor Type, and Triac/Thyristor.

Servo Motor AVR (Single Phase and Three Phase)

Electromechanical regulators are also called voltage stabilizers which are commonly used to regulate voltage on AC power distribution lines. These regulators operate by using a servomechanism to select the appropriate tap on an auto transformer with multiple taps (servo type), or by moving the wiper on a continuously variable auto transformer. If the output voltage is not in the acceptable range, the servomechanism will switch the tap; change the turns ratio of the transformer, and to move the secondary voltage into the acceptable region. The controls provide a dead band wherein the controller will not act, preventing the controller from constantly adjusting the voltage as it varies by an acceptably small amount. Servo type stabilizers have high precision as 1% or 3%, they are used for devices which need precise adjustment for output voltage.

       The Voltage regulators are sold mostly in third world countries like Bangladesh, Pakistan, Indonesia, Nigeria, etc. After careful market research, KEBO stabilizer offers alternative voltage ranges towards voltage fluctuations: 160-260V, 140-260V, 100-260V, 80-260V (for single phase), and 260-450V (for 3 phase). Customers can choose appropriate voltage range that they feel comfortable to use in their targeted market. We also offer OEM or ODM solutions for voltage regulators requested by our customers. YOU NAME IT, WE MAKE IT!

Relay Type AVR (Single Phase)

In relay type stabilizer, electronic circuit is controlled by relays set besides the transformer, comprising rectifier circuit, controller unit and other tiny components. The electronic circuit compares the output voltage with a reference value provided by build-in voltage source. Whenever the voltage rises or falls, the control circuit switches the corresponding relay connected to a desired tapping of the output voltage. Relay stabilizers usually have an output voltage accuracy of 10% or 8%. It is used for low rating home, office, or industrial appliances such as TV, Computer, Fan, etc. Nowadays, there is still many electrical equipment or machines suffering from unexpected voltage fluctuations, less durability, and other power interruptions. Therefore, relay stabilizers can provide relative stable voltage in order to protect different sources of equipment.

Triac Stabilizer (Thyristor/Silicon Controlled AVR)

Due to increased complexity of electrical power systems, there has been increasing demand in the stabilization of such systems.

Therefore, a voltage regulator using Thyristor Controlled is presented. The load voltage can be stabilized against supply voltage variation above and below the desired level. Boosting or bucking effect is performed in steps but with no distortion or phase-shift in the load voltage. Perfect adjustment of the load voltage is possible using independent phase control in a narrow range (in between the steps). A three-limb magnetic circuit is used such that flux of the boosting (or bucking) coil is varied in accordance with the action of a switched secondary circuit. Accordingly voltage current transients in the load circuit are avoided. The reaction of thyristor voltage stabilizer is as fast as 4 milliseconds concerning voltage fluctuation. Therefore, it can effectively protect heavy duty devices.

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