Readers are advised to proceed with the construction of the presented circuits only after understanding the concepts from the core. Not adhering to this can lead to failures and frustrations.

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Friday, December 9, 2011

A Simple 5 KVA to 10 KVA Automatic Voltage Stabilizer Circuit Explained - 220 Volts, 120 Volts

The diagram shows a rather simple voltage stabilizer design which can hold huge output power in the order of 5 to 10KVA. The use of SSR or solid state relays makes the output stage easy to configure and very accurate - thanks to the modern SSRs which are designed to trigger massive power in response to smaller input DC potentials.

More innovative circuits HERE.
The proposed circuit of a simple 5 KVA to 10 KVA automatic voltage stabilizer circuit is easy to understand. All the opamps are arranged in standard voltage comparator modes.
The presets P1 to P7 can be adjusted as per the required tripping points, which will correspond to the output SSR switching and the subsequent transformer tap selections.

The central green TAP is the normal voltage output, the lower TAPs gradually produce higher voltages while the upper TAPs are set for lower voltages.

These TAPs are chosen by the appropriate SSRs in response to the varying AC voltages, thus adjusting the output voltage to the appliances close to normal levels.

This circuit was asked by Mr. Alexandar and the SSR data was provided by him.

Parts List

R1 to R9 = 1K, 1/4 watt,

P1 to P7 = 10K preset,

C1 = 1000uF/25V

VR1 = 1K Preset,

opamps = IC 324,

Transformer = Input 230volts or 120volts, Taps - incrementing/decrementing voltage levels (TAPs) as per individual specs.

SSR = 10KVA/230volts = output, 5 to 32 volts DC = input

COMPLETE SSR SPECIFICATION CAN BE FOUND HERE:

http://www.unisoncontrols.com/ssr-dc-to-ac-1ph.php

Full circuit diagram of the proposed A Simple 5 KVA to 10 KVA Automatic Voltage Stabilizer Circuit @220 Volts, 120 Volts



41 comments:

  1. hi..what is the coast of this project.?

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  2. hi ..
    what is the stabilized voltage output range here?

    ReplyDelete
    Replies
    1. approximately within 220v to 230V with input extremes of 160 to 290 volts

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  3. Where can you find the transformer?

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  4. how to make it's input range from 100v to 290v ?

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  5. Can you please tell me the ordering spec for transformer. Say my requirement is around 8KVA
    (Around 35Amps). How do i explain the spec to a tyranny maker- is it like primary 230VAC and secondary is 160 to 300vac and 35Amps (8KVA). Thanks
    Parvath

    ReplyDelete
    Replies
    1. I think you should first build the circuit, if it switches correctly then you may proceed with the transformer.

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    2. Is the transformer an auto transformer? How are the tappings varied?

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    3. How can one make the input extreme voltages to be 110- 260acv?

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    4. The transformer is an auto-transformer which is switched automatically by the relay contacts depending upon the settings and the input voltages.

      The voltage range may be applied by choosing an appropriate auto transformer matching the required specs.

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  6. What is the recommended value for the Zener diode?, Z1?

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  7. Goodday sir. Am still new to electronics. I like this project, and want to do it. My questions are (1) what was your set value of VR1 (1k), P1-P7 (10K) for the relay to switch automatically? (2) what are the number of turns of each tap of your transformer where the seven SSR is connected.

    ReplyDelete
    Replies
    1. Goodday to you,

      This circuit is complicated and not suitable for the newcomers, so it will be difficult for me to explain it to you....

      Delete
  8. Sir, i understood the circuit. I have built an inverter and battery charger before. I can wind transformer and i want to try your circuit. I want to learn more practically, that was why i want to know the number of turns and corresponding voltages for each loop of the transfo. And your set resistance value of VR1 and P1-P7 so that it will be easy for me to build it. I intend constructing AVR in my final year, 2013. Please, Sir i need your help

    ReplyDelete
    Replies
    1. The transformer will need to be procured readymade or specially ordered with desired voltage taps.

      All preset needs to be adjusted while setting up the circuit, it's values are never fixed so cannot be predetermined.

      You will have to first learn about how opamps are used as comparaters before making this circuit.

      Delete
  9. I WANT TO DESIGN A 10KVA AVR WHAT ARE THE NECESSARY STEPS TO
    FOLLOW.

    ReplyDelete
    Replies
    1. You should have a sound knowledge of electronics, that's probably the foremost requirement to begin with this project.

      Delete
  10. Does the stabilizer circuit comprising of SSR's the make clicking sounds when there is a of voltage flactuation?

    ReplyDelete
    Replies
    1. ssrs never make clicking sounds. relays make clicking sound.

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  11. Hi Swagatam, I built this circuit and it switches very fine but i have a challenge of often burnt out SSR. First i blamed it on conterfeited component until i used a fairly used original SSR. I was faced by the same problem. what do you suggest i do? . this is a 15kva unit and 75A SSR was used. It got burnt even without load when transiting.

    ReplyDelete
    Replies
    1. The transition zone might be causing the problems, at this zone two adjacent SSRs might be conducting together for a fraction of a second causing a possible short circuit across their AC connections.

      Connect a zener diode, may be 6V zener at the outputs of all the opamps, so that the inputs of the SSRs receive the triggering voltage a shade later, after the relevant opamps have switched completely.

      I hope this works.

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  12. hello Swagatam, I built this circuit and it switches so fine and accurately but the problem lies on often burnt out or short circuit ssr @ transition from one voltage lever to another.A 75A ssr was used. Even without a load i often get a burnt out relay when switching. i know my setting are okay. So what do i do.

    ReplyDelete
    Replies
    1. connect 6V zener diodes in series with R2------R8

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    2. I was thinking along that line too. I'll try just that ;connecting 6v zener diode in series with R2-R8.
      Thanks And Regards.

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    3. Hello Dear Swagatam,
      I did it as suggested putting 6V zener diode in series with the 1k resistors, i realize the SSR was not switching then, i changed it to 3V each they started switching only for the last two low voltage side that did not switch on 3V zener ,I furtherly reduced those two Zener to 2.2V and it worked. And not burning my SSR as before now. That Transition zone between two SSR can't it be totally separated because i experience a vibration in my gadget when in that zone.
      regards.

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    4. You may replace the zeners with RED or Green LEDs, this will effectively isolate the transition zones, and also will provide useful indications regarding the switching conditions......

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  13. sir please tell me the opam value

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  14. Pls you said TR1 is an auto transformer, what are the voltage tapings

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  15. Please sir, i want to know the voltage tapping of the TR1 as i will like to construct the the autos transformer

    ReplyDelete
    Replies
    1. the lower taps are rated with gradual increasing voltages while the upper taps are rated with gradual reducing voltage. The voltage selections will depend on your specific needs.

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  16. whats the specification of that transformer ? which will need at the time to buy.

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  17. DO you have an idea what are the approximate typical % losses using a transformer vs direct ac supply?

    ReplyDelete
    Replies
    1. Sorry, I do not have the necessary formulas for calculating this....

      Delete
  18. Sir how can I adjust output voltage 230 to 220 volts

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  19. what is zener z1 volt pleas confirm z1 thanks

    ReplyDelete
  20. peas z1 value z1 volt thanks

    ReplyDelete

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