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## 02/04/2019

### Digital Energy Meter OR Static Energy Meter

The Digital Energy meter works on Digital Integration operating principle. There are no moving parts in it therefore it is also called as Static Energy Meter. The output of the meter is directly proportional to Digital pulse in it.
• Meter constant : Number of Pulses / kWh

One Pulse = ( 5 Wh ) * ( CT ratio ) * ( PT ratio )
If the CT ratio is 100/5 = 20 and
PT ratio 11 kV / 110 V = 100 then
One Pulse = ( 0.005 Wh ) * ( 20 ) * ( 100 )
= 10 Wh
= 0.01 kWh
= 0.01 Unit
There is a seven segment LED / LCD display in this type of energy meter.

### Specification of Single Phase Digital Energy Meter

• Supply voltage : 240 V, Single phase, two wires
• Frequency : 50 Hz
• Current : 0 – 40 Amp
• Class : 1.0
• Meter Constant : 3200 Pulses / unit
• Standard : IS – 13779
• Display : Seven segment LCD , 7 Digit
• Reference temperature : 27 oC
• The design of Digital energy meter is based on ASIC ( Application Specific integrated circuit ) and its manufacturing is one by Surface mount technology.
How to Prevent Tempering in the Energy Meter?

### Auto display mode

• LCD test
• Time
• Date
• Cumulative active energy ( kWh )
• Maximum demand of last bill
• Billing period count
• Each parameter display for 10 second and there should be minimum 120 second different between two cycles.

### Push button mode

There is following information display by pressing push button
• Active energy of last bill
• Instantaneous kW
• Instantaneous voltage, current
• Maximum demand
• Supply frequency
• Time of Day ( TOD ) and Time of usage ( TOU ) energy
• Instantaneous power factor
• Temper count
• Meter serial number
Memory
• There is a non volatile memory for data storage therefore data always save in spite of power cut from utility company. Battery backup is not included in the NVM.
• The specific of all Digital energy should not be same but it should be as per Indian Standard.
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