Presentation on theme: "AWARENESS PROGRAM ON METER & HOUSE WIRING. 2 What is Electricity Meter A device to record Energy consumption."— Presentation transcript:
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% 2.05A~10A ( Mech.) Read 26% 3.0 5A~20A (mech.) Read 53% 4.010~40A(Mech.) Read Okay 5.010~60A ( 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
6FAQ 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 CAL LED REV LED N-CUT EL
9 ROLE OF LED CAL LED High resolution out put device for meter checking
10 ROLE OF LED REV LED * Indicates reverse flow of Energy Reasons *Incorrect wiring *Use of un isolated *Generator/ Inverters
11 ROLE OF LED EL Due to ‘unbalanced’ Current. Needs Attention
12 ROLE OF LED N- Cut Indicates current without voltage on Meter Contact discom immediately
13 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. KNOW ABOUT EL
14 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) KNOW ABOUT EL
15 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 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 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. KNOW ABOUT EL
19 HOUSE DISTRIBUTION BOX METER MCB / Switch Fuse Neutral Phase D. Box
20 NORMAL CONNECTION I red = I yellow E mech = E elect
21 NORMAL CONNECTION I red < I yellow E mech < E elect JUMPER
22 INPUT PHASE / NEUTRAL INTERCHANGE NO EFFECT I red = I yellow E mech = E elect
23 NEUTRAL TOUCHING TO EARTH NO EFFECT EL glow I white < I red ( EL on) Electronic = I red Mechanical = I red E mech = E elect
24 INTERCHANGE LINE & NEUTRAL EARTH SHIFTING I red > I white ( EL on) Electronic = I red Mechanical = I white Mechanical read less EL glow
25 INTERCHANGE LINE & NEUTRAL EARTH SHIFTING I white = 0 I red > I white ( EL on) Electronic = I red Mechanical = Nil Mechanical read Nil EL glow
26 ELECTRONIC METER RECORD CORRECTLY No Effect
27 COMMON NEUTRAL Meter Recording As per Neutral Current (Extra) As per Phase current (okay)
28 COMMON NEUTRAL 15A 5A (15+5) A 10A
29 COMMON NEUTRAL 15A 0.5A 14.5A (15+0.5) A
30 COMMON NEUTRAL 15A 5A 10A (15+5) A
31 INTERCONNECTED NEUTRAL
32 Wiring Defect Type Of Defects Distribution Box Wiring
33 Distribution Box 1.Use of DP- MCB/ Isolator 2.Ensure ELCB. 3.For more than 10 Amp ckts. Separate MCB. Separate MCB. 4.Neutral Bus-bar. 5.Correct fuse & wire size.
34 MCB ELCBFUSE Proper Installation
35 Wiring Defect Earth (No Neutral) N-E Common N Common P Combination
36 Wiring Defect Clamp on tester Bulb tester Line tester Electrician Kit. Tools
37 Clamp on tester
38 HOUSE DISTRIBUTION BOX METER MCB / Switch Fuse Neutral Phase D. Box GLOW
39 HOUSE DISTRIBUTION BOX METER MCB / Switch Fuse Neutral Phase D. Box GLOW
40 Wiring Defect Step-1. If number of meters in one premise is only one, then there is no common Neutral problem.
41 Step-2. Load On Check I phase & I neutral If I neutral = 0 Earth is used. Phase Neutral METER EARTH ELNE CommonNeutral 10A 0A
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 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 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 Step-8. Once Ckt. Identified then repair The defect. Step-9. Once again check all current. i.e. I p = I n
47 HOUSE DISTRIBUTION BOX METER MCB / Switch Fuse Neutral Phase 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 !!Beware !! Meter can only be touch by Discom (BSES) employee.