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I'm creating a PCBA that uses a hall-effect sensor to measure current and a transformer rectifier design to measure the mains voltage. And But I seem to be getting errors in my Wh calculation You don't measure power or watt hours that way. You are bound to get errors. Power is measured by multiplying the raw voltage AC waveform with the raw current AC ...


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Having the earth pin of the secondary plugs lessens the safety of the isolation transformer. The purpose of an isolation transformer is to float the secondary remove reference to earth. What this does, is that if any one connection is made to earth that connection will reference to earth and there will be no difference in potential. For example, if a ...


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Maybe electricity with your poor voltage regulation costs less than with normal and good voltage regulation. Maybe your electricity uses old transformers that were designed for less power that is used today and should be replaced with more powerful (and more expensive and larger) transformers. The transformers and underground wiring on my street in Canada ...


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By the ratings ... 0.75 mm2 three core overall insulated cable is rated at 6A for domestic use. Protecting it with a 5 A fuse is therefore compliant with the ratings. 720 W is roughly 3 A, which is less than the fuse rating and the cable rating. If you're using it in a domestic setting, so normal room temperature ambient, then it looks like you're good. ...


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Isolation means the first ground fault is free Normally, mains supply is isolated except there's a neutral-ground equipotential bond at the service point (facility supply), whose job is to assure the supply doesn't float thousands of volts above earth, and return fault current to source (the supply transformer not earth). This N-G equipotential bond ...


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An isolation transformer will help protect you from Line to Ground shocks. With an isolation transformer, both mains inputs are floating and negligible current will flow from single mains input and ground. If you never ground yourself, this isn't very helpful. But, it is very easy to ground yourself! Any test equipment connected to the mains is grounded. ...


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It sounds like there's some sense that you could in theory poke at various components while the device is powered on and as long as you only touched in single places and didn't accidentally bridge circuits you would be safe, but this doesn't sound intuitive to me. I mean, I'm in danger normally of shocks towards ground even with shoes on, aren't I? That's ...


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In a large power system one large generator is dedicated as master and responsible for the frequency control and is governed(synchronised) to run at the system frequency. Loads and generators are now added to the system. The load supplied by each generator is determined by the power source (steam turbine.) The whole systems runs at the same frequency. If ...


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