Here is an excellent paper from 1985:
https://www.nist.gov/system/files/documents/pml/div684/Repetitive_surges.pdf
https://www.nist.gov/system/files/documents/pml/div684/Repetitive_surges.pdf
Therefor it may be optimal to buy tested/certified industrial main filters by a know brand as shielded IEC inlet with builtin mains filter and fuse holder combined with a DIN rail mounted industrial surge protector. All tested and certified as opposed to audio toy stuff with a mouth full of of abbreviations and pseudo truths. An industrial rail mount surge protector changes its color from green to red when a serious surge is damped. It then needs replacement. For audio I think these are overkill and/or chances are unlikely when switching stuff off every evening with a DIY power distributor so I take my chances. Often they are included anyway in Schuko power distributors in the form of MOVs.
I have seen situations in industrial environments where they did a good job but also in a few cases that they could not prevent stuff going out with a bang. When things go wrong they just go wrong 🙂
I have seen situations in industrial environments where they did a good job but also in a few cases that they could not prevent stuff going out with a bang. When things go wrong they just go wrong 🙂
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Considering I have some metalworking machines that use 3 phase, I have had a plan in mind going back years to do the following:
Would it work?
(I think so.)
- Get a synchronous AC motor with a horsepower rating higher than any load I expect to use,
- Attach a large and heavy balanced flywheel to it supported by high quality bearings
- And attach a generator motor at the other end of the shaft, tapping off of that to supply clean AC to whatever I need it for.
Would it work?
(I think so.)
That is called a motor generator set.
Quite common.
In a small 2 HP / 1.5 kW size, difficult to find.
Use a solar or otherwise powered battery system, tapped at 12V for pre amp section, 24V or 48V for output section.
Use when charging is off (not applicable for solar).
Problem of noise is solved. Even a motor generator is a little noisy, not all houses have a three phase supply.
Observe sane precautions with batteries, fumes can be dangerous.
Quite common.
In a small 2 HP / 1.5 kW size, difficult to find.
Use a solar or otherwise powered battery system, tapped at 12V for pre amp section, 24V or 48V for output section.
Use when charging is off (not applicable for solar).
Problem of noise is solved. Even a motor generator is a little noisy, not all houses have a three phase supply.
Observe sane precautions with batteries, fumes can be dangerous.
MG sets were used for frequency conversion 50 - 60 Hz (or vice versa), and also voltage conversion at the same time.
You can look them up, I do not see many of them in operation now, it is easier to replace the motor, and sometimes changing the motor to a BLDC motor or a VFD motor drive achieves the purpose of energy saving in hydraulic machibnes for example.
So it is now an obsolete and less reliable than electronics solution.
So, you want to put a set in your workshop and send DC to the sound system?
I would say buy a 12V chip amp, or find a car radio, run it off battery.
Enough for 2W / channel, normal listening level.
Much easier than a line conditioner, and the risk of a home brew solution, which can void your personal life and health insurance as well along with your house insurance.
Here in India, a man died when his car caught fire, his driver (employee) also died.
His 1 million US Dollar life insurance claim was denied because the car was illegally using LPG (not informed registering authority, it has to be checked and endorsed on registration certificate by vehicle registering authority).
Family fought the case till the Supreme Court, which decided that as the owner (not an unwitting passener), he was aware of the illegal act, so case was dismissed.
No car insurance either.
That is the state of affairs in our country, and you can also be denied insurance of all kinds if you break the law in your country.
Your call...I feel you should not play with mains unless you are experienced, and at $100 per hour of tech time, you can buy a decent system in a days' wages, and live to enjoy your life.
You can look them up, I do not see many of them in operation now, it is easier to replace the motor, and sometimes changing the motor to a BLDC motor or a VFD motor drive achieves the purpose of energy saving in hydraulic machibnes for example.
So it is now an obsolete and less reliable than electronics solution.
So, you want to put a set in your workshop and send DC to the sound system?
I would say buy a 12V chip amp, or find a car radio, run it off battery.
Enough for 2W / channel, normal listening level.
Much easier than a line conditioner, and the risk of a home brew solution, which can void your personal life and health insurance as well along with your house insurance.
Here in India, a man died when his car caught fire, his driver (employee) also died.
His 1 million US Dollar life insurance claim was denied because the car was illegally using LPG (not informed registering authority, it has to be checked and endorsed on registration certificate by vehicle registering authority).
Family fought the case till the Supreme Court, which decided that as the owner (not an unwitting passener), he was aware of the illegal act, so case was dismissed.
No car insurance either.
That is the state of affairs in our country, and you can also be denied insurance of all kinds if you break the law in your country.
Your call...I feel you should not play with mains unless you are experienced, and at $100 per hour of tech time, you can buy a decent system in a days' wages, and live to enjoy your life.
I just recently bought a powerline conditioner for our computer system. We've had powerline glitches take out two power supplies so I decided it was time to do more than just use one of those cheap "surge protector" style power strips, which did NOT protect anything, as far as I could determine. Its a Triplite and can handle up to 600 watts of load. It claims to compensate for brown-out situations as well so it has to use pretty much the same electronics as a UPS but just doesn't have a battery. Sort of a AC-->DC-->AC converter, but the DC and/or inverter are designed so the output stays reasonably stable. Yes a full power outage will cause it to drop out too but at least there's one more layer of protection between the mains and our electronics.
It wasn't all that expensive, either.
It wasn't all that expensive, either.