1. -BY H R PATEL DE HILLDRIVE SDN BHAVNAGAR CITY 2 DIVISION
DIGITAL METERS
-BY H R PATEL
DE HILLDRIVE SDN
BHAVNAGAR CITY 2 DIVISION

2. DIGITAL METERS SINGLE PHASE THREE PHASE(WHOLE CURRENT)
THREE PHASE CT OPERATED
SOLAR BIDIRECTIONAL METER(1PH AND 3PH )
THREE PHASE HT METER(TVM)

3. SINGLE PHASE MEETR WORKS ON SINGLE PHASE SUPPLY FOURE TERMINALS
MAX CAPACITY (30AMP)
P P
N N

4. THREE PHASE METER (WHOLE CURRENT)
WORKS ON THREE PHASE 4WIRE SYSTEM
8-TERMINALS
RM-RL-YM-YL-BM-BL-NM-NL
AMP CAPACITY 10-60AMP

5. TB CONNECTION IN WC METERS

6. THREE PHASE CT OPERATED
WORKING ON THREE PHASE 3WIRE
10 TERMINALS (1S1-R-1S2-2S1-Y-2S2-3S1-B-3S2-N)
AMP CAPACITY AMP
CT RING EXTERNALLY CONNECTED
PT SUPPLY 240V EACH PHASE(DIRECT FROM SUPPLY CABLE)
HAVING MF =CT CTR*CT PTR/METER CTR*METER PTR
1S1-R-1S2-2S1-Y-2S2-3S1-B-3S2-N

7. TB CONNECTION IN CT OPERATED METER

8. THREE PHASE HT METER CTPT OPERATED METER 3PHASE 4WIRE METER
CT AND PT BOTH EXTERNALLY SUPPLIED TO METER
CAP -1/-5A,-/110V(PRIMERY VOLTAGE 11KV)
CONNECTION PROVIDE THROUGH TTB(TEST TERMINAL BLOCK)
MF =(CT CTR*CT PTR)/(METER CTR*METER PTR)

9. TTB CONNECTION WITH HT TVM

10. MF CALCULATION EXAMPLE
For 22kv supply, the CTPT unit would naturally be of 22kv/110v and hence, calculation of MF for CTPT unit of 30/5A, the MF would be as under:
MF=
Such installations are there under Surendranagar circle.

11. IMPORTANT METER PARAMETERS
VOLTAGE
CURRENT
KWH
KVARH (LAG)
KVARH(LEAD)
RMD(KW)
BMD(KW)
DATE AND TIME
POWER FACTOR
In bidirectional meter IMPORT kwh and EXPORT kwh both reading taken

12. POWER FACTOR IMPORTANT OF POWER FACTOR POWER FACTOR
INCREASE EFFICIENCY OF SYSTEM
MAXIMIZE CAPACITY
IMPROVE VOLATAGE
REDUCE LOSS
SYSTEM STABILITY(FREQ MAINTAIN)
DEMAND MANAGEMENT
POWER FACTOR
PF(AVG)= ACTIVE ENERGY(KWH)
APPERANT ENERGY(KVAH)
IT SHOULD BE NEAR TO 1(ONE)

13. HOW POWER FACTOR EFFECTS
KVAR (LAG)(Q)
KVAR(LEAD) KW KVA(S)
KW(P)

14. POWER FACTOR IMPROVEMENT
SIMPLY USING CAPACITOR BANK
CALCULATION OF CAPACITOR REQIURED
Q= S² - P²
KVA=KW/cosΦ
Xc (CAPACITANCE)=1/2∏fc
Q=VI sinΦ VAR
Q= V²/Xc VAR
C= Q/ 2∏f V² farad

15. CT OPERATED METER CHEKING
METER DETAIL(INCLUDING METER CT RATIO AND PT RATIO)
CT RING DETAIL(RATIO)
PT RATIO
FINDING MF = CT CTR*CT PTR
METER CTR*METER PTR
DETAIL OF CTPT UNIT IF IT IS EXTERNAL

16. TTB(TEST TERMINAL BLOCK)
As its name, it is used for the testing of meter without opening meter TC(w/o disturbance of metering)
It used in HT/EHT METERS
Easily series the Accu-chek meter with Consumer meter
CT worked in normal mode
From TTB PT can be opened

17. TTB

18. MRI REPORT DETAIL of MRI Instantaneous Parameters
Energy value(generally as per last 12 history/reset )
Load survey data
Tampered data
Transactions

19. CTPT TERMINAL BOX
PT CONT
R-Y-B
CT CONT
1S-2S
n-N CONT

20. 1PH DIGITAL METER CONSTRUCTION

21. 3PH DIGITAL METER CONSTRUCTION

23. MAIN PARTS OF DIGITAL METERS
TRANSDUCER(sencers)
ASIC(Application Specified Integrated Circuit)
ADCs(Analog to Digital Converter)
LCD DISPLAY
WDT(TIMER)
RTC
LED
INFRARED COMUNICATION (LED)
UART(UNIVERSAL ASYNCRONOUS RECIVER/TRASMITTER)+PREPAID CARD MODULE(IN PREPAID METERS)
PUSH BUTTEN SWITCH

24. SOLAR METER CONNECTION
CONTROLER/INVERTER UNIT
GENERATION
METER
MAIN
METER
SOLAR
PANEL
FROM THE
SERVICE POLE
MAIN SWITCH
CONSUMER LOAD SIDE

25. Thank you!!!!