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AWARENESS PROGRAM ON METER & HOUSE WIRING

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Presentation on theme: "AWARENESS PROGRAM ON METER & HOUSE WIRING"— Presentation transcript:

1 AWARENESS PROGRAM ON METER & HOUSE WIRING

2 What is Electricity Meter
A device to record Energy consumption.

3 Meter Terminology No load Test Starting Current Current Range
Influence parameters

4 Meter Type v/s Recording
If Load is 2 AC, 1 Geyser, 1 Fridge, 1 TV, 20 bulb Current ……………… 38 Amp Sr. No Rating Recording ~5A ( Mech.) Read 15% 2.0 5A~10A ( Mech.) Read 26% A~20A (mech.) Read 53% ~40A(Mech.) Read Okay ~60A ( Elect.) Read Okay

5 BSES Electronic Meters
Specifications Rating 10~60A Starting 0.2% Kwh and MD in KW TOD, 6 Tariff and 6 time zone 6 Month Billing data RS232C Transformer supply

6 FAQ Why Mechanical meters read less Influence Parameters Age
Wear and Tear Narrow Range Mounting Dust and Oil effect Mechanical Counters

7 FAQ Why electronic meters are preferred Wide Range
Low starting current Less effect of Influence parameters More accurate Tamper proof

8 ROLE OF LED N-CUT CAL LED EL REV LED

9 ROLE OF LED CAL LED High resolution out put device for meter checking

10 * Indicates reverse flow of *Generator/ Inverters
ROLE OF LED REV LED * Indicates reverse flow of Energy Reasons *Incorrect wiring *Use of un isolated *Generator/ Inverters

11 Due to ‘unbalanced’ Current.
ROLE OF LED EL Due to ‘unbalanced’ Current. Needs Attention

12 Indicates current without
ROLE OF LED N- Cut Indicates current without voltage on Meter Contact discom immediately

13 KNOW ABOUT EL The glowing of the EL LED indicates the following:
Earth is being used as neutral. Neutral is touching the earth. Phase / Neutral wire is touching with phase / neutral wire of the neighbour Neutral wire is interconnected with the neighbors neutral wire.

14 Wrong wiring, among others things can result in:
KNOW ABOUT EL Wrong wiring, among others things can result in: Safety hazards (wires are still live, even when the main switch is off). Cause fire (if by mistake, phase and neutral wires get interchanged) Wrong Current flow (neighbours current can flow through your meter)

15 * In general Phase, current is used for measurement. However
Good electronic meters have Current sensors in both the Phase path, and Neutral path For Measurement, it chooses higher * of the two current. * In general Phase, current is used for measurement. However if neutral Current varies by more than 10~ 12 % then Neutral current selected

16 Electro-mechanical Meter has Current sensor only on one wire
All Measurement based on phase wire current even when connected to neutral.

17 But neutral looping may cause the meter to “run extra”
Good electronic meters have Current sensors in both the Phase path, and Neutral path This is an advantage of electronic meters over electromechanical meters Never buy electronic meters without this feature But neutral looping may cause the meter to “run extra”

18 KNOW ABOUT EL If EL is glowing, get your internal wiring checked for any leakages and other problems and also carefully look at the EL LED in the Electronic Meters. EL LED, in Electronic Meters, however small, is of great importance and consumers are advised not to ignore its usefulness.

19 HOUSE DISTRIBUTION BOX
METER MCB / Switch Fuse Phase Neutral D. Box

20 I red = I yellow E mech= Eelect
NORMAL CONNECTION I red = I yellow E mech= Eelect

21 I red < I yellow E mech< Eelect
NORMAL CONNECTION I red < I yellow E mech< Eelect JUMPER

22 I red = I yellow E mech= Eelect
INPUT PHASE / NEUTRAL INTERCHANGE I red = I yellow E mech= Eelect NO EFFECT NO EFFECT

23 NEUTRAL TOUCHING TO EARTH I white < I red (EL on)
Electronic = I red Mechanical = I red EL glow E mech= Eelect NO EFFECT

24 INTERCHANGE LINE & NEUTRAL I red > I white (EL on)
EARTH SHIFTING EL glow I red > I white (EL on) Electronic = I red Mechanical = I white Mechanical read less

25 INTERCHANGE LINE & NEUTRAL I red > I white (EL on)
EARTH SHIFTING I white = 0 EL glow I red > I white (EL on) Electronic = I red Mechanical = Nil Mechanical read Nil

26 ELECTRONIC METER RECORD CORRECTLY
No Effect

27 COMMON NEUTRAL As per Phase current (okay) Meter Recording As per
Current (Extra) As per Phase current (okay)

28 COMMON NEUTRAL 15A 15A 15A (15+5) A 15A 5A 15A 15A 15A 10A

29 COMMON NEUTRAL 15A 15A 15A 14.5A 15A 0.5A 15A 15A 15A (15+0.5) A

30 COMMON NEUTRAL 15A 15A 15A 10A 15A 5A 15A 15A 15A (15+5) A

31 INTERCONNECTED NEUTRAL

32 Wiring Defect Type Of Defects Distribution Box Wiring

33 Distribution Box Use of DP- MCB/ Isolator Ensure ELCB.
For more than 10 Amp ckts. Separate MCB. Neutral Bus-bar. Correct fuse & wire size.

34 ELCB FUSE MCB Proper Installation

35 Wiring Defect Earth (No Neutral) N-E Common N Common P Combination

36 Wiring Defect Tools Clamp on tester Bulb tester Line tester Electrician Kit.

37 Clamp on tester

38 HOUSE DISTRIBUTION BOX
METER MCB / Switch Fuse Phase Neutral D. Box GLOW

39 HOUSE DISTRIBUTION BOX
METER MCB / Switch Fuse Phase Neutral D. Box GLOW

40 If number of meters in one premise is only one, then there is
Wiring Defect Step-1. If number of meters in one premise is only one, then there is no common Neutral problem.

41 Check I phase & I neutral
Step-2. Load On Check I phase & I neutral If I neutral = 0 Earth is used. METER Phase 10A Neutral 0A EARTH Common Neutral EL NE

42 Step-3. If Neutral removed from MCB is still load working, then it is a wiring problem. If the total MCB is off and the load is still working, then both wire are being shared

43 If Phase is Off, then EL Off Means Neutral-Earth Problem.
Step-4. At MCB If Phase is Off, then EL Off Means Neutral-Earth Problem. Step-5. If neighbour Phase Off Then EL Off , Means Common wire.

44 Phase Neutral EARTH Phase Neutral EARTH

45 If V EN ≠ 0 If common wire Then Earth not touching Neutral
Step-6. If V EN ≠ 0 Then Earth not touching Neutral Step-7. If common wire Disconnect one by one Neutral Ckt. From Bus-bar & see if EL off.

46 Once Ckt. Identified then repair Once again check all current.
Step-8. Once Ckt. Identified then repair The defect. Step-9. Once again check all current. i.e. Ip = In

47 HOUSE DISTRIBUTION BOX
METER MCB / Switch Fuse Phase Neutral D. Box GLOW

48 Typical Defect Pts. Common Load. E.g. Motor
Stair Case Light (i.e. two way switch. Common Invertors / Generator. Houses with separate power & light meter.

49 Typical Pts. Where Earth gets common with neutral
Metallic body Appliances. Appliances connected with metal pipe line. Building RCC.

50 Meter can only be touch by Discom (BSES) employee.
!!Beware !! Meter can only be touch by Discom (BSES) employee.

51 Thank You


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