Need help regarding voltage stabilizer

Raikabiral

Recruit
I am currently using VEW 500 plus but the voltage in my area can range anywhere between 70-100 volts . I use a custom mainline stabilizer which has 2 phase connection. So this 2 phase connection doubles the voltage output. I have 2 questions :
1- My Ac stablizer makes sparking like sound beside the relay clacking sound . Is that okay? And can I use vew500 plus phase to phase?
2- If I connect my vew500 plus to mainline stabilizer instead of directly on grid . My mainline stabilizer if 10 kva btw?
Thank you
 
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