Kilowatt Hour Meter Single Phase

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I am using this to measure how much electricity is going to my electric vehicle charger.The Good: It works for what I need ( 1 week ) so far and is very inexpensive.

Accepts 240V ( 2 Hot Wires ) w/o neutral or ground even thought the diagram on it looks more like 120V setup.

The lugs are large enough and tighten up enough for it to conduct the amperage it is rated for.

I used #6 wire because I am only running 40A through it max.

It fits inside a cheap metal enclosure ( Halex HNF60R ) with a cutout for the display.The Bad: This is not UL listed so I am not confident that it will not melt and catch fire.

I originally purchased a plastic electrical box with clear cover for this but decided a metal enclosure would be a little safer. Instructions are not great but if you understand electrical and have the confidence to ignore the diagram and put one Hot to L-IN side and the other Hot to N-IN ( to make a 240V circuit ) then you will be fine.

The front clearly states 230V rating so that is what I am trusting here. In this topic, you study Single Phase Energy Meter – Working, Construction & Diagram. A single phase energy meter is used for measuring the power consumption in kilowatt-hours (kWh) of a domestic or industrial electrical installation. A single phase energy meter is a sort of induction type watt-hour meter. It consists of two electromagnets. One magnet is called the shunt magnet Ml which is mounted with a pressure coil. The pressure coil is a long coil made of fine copper wire which is connected across the supply line. Another magnet is called the series magnet M2 which is mounted with current coil. The current coil is a short coil made of thick copper wire which is connected in series with the load. There is a round aluminium disc which is placed between two magnets and it is mounted on a spindle. The spindle rests on two pivots. A horse-shoe magnet is placed on one side of the disc to provide damping, as shown in Fig. 19: Single Phase Energy Meter. When the meter is connected to the supply line and the load, then both the coils produce their magnetic fields.

The field produced by the current coil is directly proportional to the magnitude of current flowing through it (or through the load, since it is connected in series with the load). The field produced by the pressure coil depends on the voltage across it. Both the fluxes produce eddy currents in the disc. Thus, we have two fluxes and two eddy currents and therefore two driving torques resultant produced on the disc.

The damping torque is produced by the permanent magnet. Shading rings are mounted on the shunt magnet for the correction in power factor of the meter.

The rotational speed of the disc is counted by a counting mechanism which may be of any one of the following types:.

Cyclo Dial : This system consists of many round discs each marked with 0 to 9 digits on its periphery.

All the discs are connected with gears to each other, as shown in Fig. The collective reading of all the discs shows kWh. 20 : Cyclo Dial System.

Clock System : This system is identical to a clock.