Prevent Tempering in the Energy Meter

The tempering in the Energy meter is prevented by following methods.

AC Watt hour meter

• The location and installation should be as per CEA ( Central Electricity Authority ).
• There should be no joints in the incoming cable and cable should be easily traced.
• The seal of meter should be easily visible and accessible.
• The installation of the CT is done in the neutral circuit in order to prevent tempering in the neutral circuit. 
• The CT rating in the neutral circuit and phase circuit must be same. 
• The installation of CT should be done such that there should be no tempering. 
• The cable terminal of HV consumer should be sealed and easily accessible. 
• The CT and meter is in single unit for LV consumer. 
• If the CT is used separately, the cable wire connection is passing through conduit in order to reduce tempering. 
• The CT block is used in order to reduce tempering in the CT in which terminals are directly connected to meter. 
• The tempering in the service cable is prevented by passes through conduit and bottom or back hand side. 
• The mounting of meter is done with proper encloser and multiple sealing.

There are following numbers of sealing as per IS : 14772 in order to prevent it access without braking it.

• Manufacture meter seal
• Service provider meter seal
• Terminal cover seal
• TTB seal ( Test Terminal Block )
• CT – PT seal
• Meter box seal
• Cable joint seal

Digital Energy Meter

There are following features in order to prevent tempering in the Digital Energy meter. 

• The reverse power LED display is provided if the input phase and neutral change. 
• The meter should record following data in spite of tempering in it. 

1. One or two phase remove 
2. Neutral remove 
3. Reverse current condition 

• The meter should record correct energy in spite of earth is used as return path. 
• The meter should not saturate in spite of DC current passes through it. ( The meter does not read accurate reading when DC current passes through it. ) 
• The meter should not temper by Remote loop induction tempering device.

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