Show with the help of a diagram, how is energy registered correctly in case of electronic meter with neutral removed and load running through the earth.

In an electronic energy meter, accurate energy measurement even with the neutral removed and the load running through the earth relies on the design of the meter to measure both current and voltage correctly. Below is a simplified explanation and diagram to illustrate this scenario.

Diagram Description:

The diagram shows an electronic energy meter connected to a load. The live (phase) wire is connected to the meter and the load, while the neutral wire is removed. The load's return path is through the earth (ground).

Diagram:

      ________________
     |                |
     |  Electronic    |
     |   Energy       |  
     |    Meter       |
     |                |
     |________________|
          |   |   
      Phase   Neutral (Disconnected)
         |     X
         |     |
       __|_____|
      |        |
  Live|   Load |
      |________|
         |  
         |  
        Earth (Ground)

Explanation:

1. Phase Connection:

   • The phase (live) wire carries the current from the power source to the load. This wire passes through the energy meter where the current is measured.

2. Neutral Removal:

   • In this scenario, the neutral wire is disconnected. Normally, the return current would flow back to the source through the neutral wire, completing the circuit.

3. Load Running Through Earth:

   • With the neutral removed, the return current flows through the earth (ground). This path completes the circuit but may introduce safety concerns and inefficiencies.

Working of the Electronic Energy Meter:

• Voltage Measurement:

  • The meter measures the voltage between the phase and the earth. In typical conditions, the potential difference remains the same as between phase and neutral, assuming a low resistance path through the earth.

• Current Measurement:

  • The meter measures the current flowing through the phase wire. Since the current entering the load is the same as the current returning through the earth, the current measurement remains accurate.

• Power Calculation:

  • The electronic meter multiplies the measured voltage and current to calculate the power consumption. Even with the neutral removed, the product of the phase voltage and current gives an accurate measure of the power used by the load.

Conclusion:

Electronic energy meters are designed to measure both current and voltage independently. In the case of the neutral being removed and the load running through the earth, the meter still accurately registers energy consumption by correctly measuring the phase current and the phase-to-earth voltage. This design ensures correct energy measurement, although it may not be a safe or recommended configuration due to potential grounding issues.