What is a Servo stabilizer?
It is an automated electronic system built to attain constant voltage levels. They protect the appliances by forming a closed loop of an absolutely controlled system. Even if there is a fluctuation in the input voltage or load, the resulting output voltage will remain invariable. It is also commonly called Servo Controlled Voltage Stabilizer. It works on the principle of servomechanism or feedback. They are used for maintaining the accuracy of high voltages with an output correction of about +_ 1%. They are installed at various institutions like hospitals and clinics, food processing units, hotels, Flour mills, etc.
Chennai is currently the largest electronics hardware exporter in India. It contributes a major chunk of Indian exports. One such company based in Chennai is Nantech Power SystemsPvt Ltd. It is one of the most promising manufacturers and suppliers in the field of building powering equipment. A few specifications of its servo stabilizers are as follows:
- It is a three-phase stabilizer that protects the appliance against the under-voltage condition or sag, over-voltage condition or surge, and other such imbalanced voltages.
- Its design type includes an O/P sensing feedback system with a feedback mechanism where the feedback voltage controls the servo motor rotation. Its rotation adjusts the brushes’ position on the autotransformer, creating a voltage difference. This voltage difference is then fed to the buck-boost transformer, a series transformer that stabilizes the output voltage and gives a stabilized and regulated output.
- It has an Opto Coupler based Triac motor drive.
- The type of motor is an A.C synchronous stepper motor, which when in the state of equilibrium, manages to bring the rotation of the shaft and the frequency of the supply current in a synchronous manner such that the rotation period and the integral number of AC cycles are equivalent to each other.
- The output voltage can be adjusted to 415 V or 380 V, or 400 V.
- True RMS is used for sensing and correction of voltage as it has more accuracy.
- The overvoltage cut off has an upper limit of +5%, meaning that if there is an increase in voltage by 5%, there’ll be a total cut off. The under-voltage cut off has a lower limit of -10%, which suggests that if there is a decrease in voltage by 10%, it will result in total cut off until the voltage comes back within the range. This will help in maintaining the safety of the appliance.
- HRC fuse or MCB or MCCB are fitted at the input to prevent the appliance from getting damaged if there is a short circuit.
- In case of overload, it will sustain a current greater than 10% of the maximum rated output current.
- If one wishes to reset, the restart option is manual and automatic, depending on what the user wants. This makes it user friendly.
- The servo stabilizer’s efficiency is more than or equal to 98% with an inbuilt phase reversal protection.
- With an ambient temperature of 0° to 50° C, it works with great efficiency.
Servo controlled voltage stabilizers are preferred over the other relay and static type of voltage stabilizers because they come with the exact system, react quickly to any variation in voltage, manufactured in a user-friendly manner with an overall well-equipped circuit ability to sustain a high voltage surge. There is absolutely no compromise on the security of the user. Furthermore, it acts like an amour for the appliance as well.