Difference between Servo Stabilizer & Static Stabilizer


Voltage fluctuations both upwards and downwards are a common site in most Indian places due to an inconsistent power supply. These voltage fluctuations have a damaging effect on our electrical appliances, which reduces the normal life of these appliances. When the voltage of the house reduces, the electric current in the appliances spikes up, this can result in an electric short circuit or burning of the appliance. To solve this constant voltage issue a device is required that will not only control the effect of the voltage but also stabilize it before the voltage reaches the appliance. Thanks to the inventions in the electrical field and the Servo stabilizer manufacturer in India such as Servo Star we can now use stabilizers to get the voltage under our control. A voltage stabilizer functions to automatically maintain a constant level of the voltage for our electrical appliances.

But there are so many types of Stabilizers that the Servo stabilizer supplier in India provides!!! How can you select one?

For making up your mind about which stabilizer suits your requirements, it is important to know about them. But, let us keep discussing about all sorts of stabilizers for later and just focus on the two main types of stabilizers for now:

  1. Servo Stabilizer
  2. Static Stabilizer ( also known as Static Voltage Stabilizer- SVS)

Servo Stabilizer

What is a Servo Stabilizer?

The following process gives a perfect answer to the question of what is a servo stabilizer. A Servo Stabilizer manufactured by Servo stabilizer manufacturer in India consists of a servo motor controlled stabilization system which provides optimum voltage supply to the electrical appliances. This is done using a Buck or Boost transformer booster that captures voltage fluctuations from the input source and then regulates the current to the correct output level. Buck Boost Transformer, contrary to dimmer it is in a rectangular shape. The Bobin is fitted with EI CRGO core and when the transformer structure is built, it is dipped in varnish
tank to provide extra protection.

The servo stabilizer supplied by the Servo Stabilizer supplier in Delhi is a closed loop control mechanism which helps to maintain the balance of the 3 or single phase voltage output regardless of the voltage fluctuations at the input source which would otherwise lead to an unbalanced condition.

Static Stabilizer

Static Stabilizer or Static Voltage Stabilizer (SVS) supplied by Servo Stabilizer supplier in Delhi (like Servo Star) is an SMPS type of stabilizer for mains voltage that is AC input and AC output. This stabilizer has a new switching topology where the PWM is performed directly in AC- to- AC switching, without causing any harmonic distortions. In this type of topology, there is no need to convert the AC input to DC and then again convert it back to the regulated AC output. The new topology has simplified the design by reducing the component count that improves the efficiency and reliability. The power stage in the SVS is an IGBT chopper control. The chopping frequency ranges around 20 KHz that ensures absolute silent operation of the SVS and a pure sine wave output.

Major Difference between Servo Stabilizer & Static Stabilizer

  • Reliability

The servo voltage stabilizer achieves correction in the voltage load by increasing or decreasing the number winding in the auto transformer with the help of the shaft of the servo motor. This results in increase or decrease of the voltage across the primary of the Buck or Boost transformer in place of the Buck or Boost transformer thereby correcting the output voltage. Therefore the reliability of the servo voltage regulators mainly depends on the reliability of the servo motor. Similarly, the reliability of the static voltage stabilizer depends on the reliability of the IGBT power stage. But if we do a general comparison the static IGBT power stage has proved to be more reliable than the electromechanical servo motor, thus the SVS is more reliable than the servo stabilizer.

  • Correction Time and Speed

As the Static Voltage stabilizer does not have any moving part, it has a pure electric circuit to achieve the corrections in voltages. Thus, the static stabilizer has an extremely low correction time of 20- 30 millisecond and an exceptionally high voltage correction speed ranging from 360 to 500 V/ sec.

On the other hand, the Servo Stabilizer uses a moving servo motor controlled stabilization system, which helps it to achieve correction in the voltage. The servo stabilizer is an electromechanical device, thus its voltage correction speed (100 V/ sec) is slower than that of static voltage stabilizer while its servo stabilizer correction time is of 50 milliseconds to 5 seconds.

  • Level of Protection from short circuit:

There is no doubt that while a stabilizer controls voltage fluctuations it should also provide protection to the heavy machinery from under and over current faults that result from short circuits. The DSP control board present in the static voltage stabilizer continuously senses the input voltage; the output voltage, the IGBT current and the load current as part of its working principle. When a short circuit happens at the output of static voltage stabilizer, the load current increases to an extremely high level which automatically gets sensed by the DSP controller which makes it cut the output and switches of IGBT power stage- this is done instantly to clear over current fault. Therefore, the over current fault gets clear in the SVS extremely quickly and without the need to add any extra hardware. But in the case of servo stabilizer, the over current protection can be achieved only with the help of extra hardware such as MCCB, CB etc.- but this process of clearing faults is not instant.

  • Maintenance

As we already know that the servo stabilizer functions with the help of a motor and having a motor will regularly result in wear and tear which needs frequent maintenance. On the other hand the Static voltage stabilizer is static in nature and does not require regular maintenance.

  • Auto Bypass Facility

The auto bypass in a static voltage stabilizer is very easy, due to the fast electronic nature of the SVS, it can transfer to bypass automatically without any break in the output voltage (Zero Transition Time), even in case of a fault. While the servo stabilizer is complicated in making the auto bypass mechanism work, due to this complication even if it is provided, the whole process becomes very costly. Also even if it this mechanism is provided it will be with break in the output voltage that is it will need a transition time.

Thus, we conclude that Static Voltage Stabilizer (SVS) provided by a leading Servo stabilizer manufacturer in India, Servo Star is a newer replacement to the traditional Servo Stabilizer.