awareness program on meter & house wiring
DESCRIPTION
AWARENESS PROGRAM ON METER & HOUSE WIRING. What is Electricity Meter. A device to record Energy consumption. Meter Terminology. No load Test Starting Current Current Range Influence parameters. Meter Type v/s Recording. If Load is 2 AC, 1 Geyser, 1 Fridge, 1 TV, 20 bulb - PowerPoint PPT PresentationTRANSCRIPT
AWARENESS PROGRAMAWARENESS PROGRAM
ONON
METER & HOUSE METER & HOUSE WIRINGWIRING
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What is Electricity What is Electricity MeterMeter
A device to record Energy consumption.
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Meter Meter TerminologyTerminology
No load TestStarting CurrentCurrent RangeInfluence parameters
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Meter Type v/s Meter Type v/s RecordingRecording
• If Load is 2 AC, 1 Geyser, 1 Fridge, 1 TV, 20 bulb• Current ……………… 38 Amp•Sr. No Rating Recording 1.0 2.5~5A ( Mech.) Read 15% 2.0 5A~10A ( Mech.) Read 26% 3.0 5A~20A (mech.) Read 53% 4.0 10~40A(Mech.) Read Okay 5.0 10~60A ( Elect.) Read Okay
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BSES Electronic BSES Electronic MetersMeters
SpecificationsSpecifications»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
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FAQFAQ
Why Mechanical meters read lessWhy Mechanical meters read less» Influence Parameters»Age»Wear and Tear»Narrow Range»Mounting»Dust and Oil effect»Mechanical Counters
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FAQFAQ
• Why electronic meters are preferred
»Wide Range»Low starting current»Less effect of Influence parameters
»More accurate»Tamper proof
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ROLE OF LEDROLE OF LED
CAL LED
REV LED
N-CUT
EL
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ROLE OF LEDROLE OF LED
CAL LED
High resolution out put device for
meter checking
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ROLE OF LEDROLE OF LED
REV LED
* Indicates reverse flow of Energy
•Reasons *Incorrect wiring
*Use of un isolated *Generator/ Inverters
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ROLE OF LEDROLE OF LED
EL
•Due to ‘unbalanced’ Current.
• Needs Attention
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ROLE OF LEDROLE OF LED
N- Cut
•Indicates current without voltage on Meter
• Contact discom immediately
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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 KNOW ABOUT ELEL
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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 KNOW ABOUT ELEL
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Good electronic meters have Current sensors in both the
Phase path, and Neutral path
For Measurement, it chooses higher * of the two current.
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
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Electro-mechanical Meter has Current sensor only on one wire
All Measurement based on phase wire current even when connected to neutral.
All Measurement based on phase wire current even when connected to neutral.
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Good electronic meters have Current sensors in both the
Phase path, and Neutral path This is an advantage of electronic meters over electromechanical meters
This is an advantage of electronic meters over electromechanical meters
Never buy electronic meters without this featureNever buy electronic meters without this featureBut neutral looping may cause the meter
to “run extra”But neutral looping may cause the meter
to “run extra”
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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 KNOW ABOUT ELEL
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HOUSE DISTRIBUTION HOUSE DISTRIBUTION BOXBOX
METERMETERMCB / SwitchMCB / Switch
FuseFuse
Neutral
Phase
D. Box
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L
N
NORMAL CONNECTIONNORMAL CONNECTION
I red = I yellow
E mech= Eelect
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L
N
NORMAL CONNECTIONNORMAL CONNECTION
I red < I yellow
E mech< Eelect
JUMPER
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INPUT PHASE / NEUTRAL INPUT PHASE / NEUTRAL INTERCHANGEINTERCHANGE
NO EFFECTNO EFFECT
N
L
NO EFFECTNO EFFECT
I red = I yellow
E mech= Eelect
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NEUTRAL TOUCHING TO EARTHNEUTRAL TOUCHING TO EARTH
L
NNO EFFECTNO EFFECT
EL glow
I white < I red (EL on)Electronic = I red
Mechanical = I red
E mech= Eelect
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INTERCHANGE LINE & NEUTRALINTERCHANGE LINE & NEUTRALEARTH SHIFTINGEARTH SHIFTING
N
L
I red > I white (EL on)Electronic = I red
Mechanical = I white
Mechanical read less
EL glow
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INTERCHANGE LINE & NEUTRALINTERCHANGE LINE & NEUTRALEARTH SHIFTINGEARTH SHIFTING
N
L
I white = 0
I red > I white (EL on)Electronic = I red
Mechanical = Nil
Mechanical read Nil
EL glow
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ELECTRONIC METERELECTRONIC METERRECORD CORRECTLYRECORD CORRECTLY
L
N L
N
No Effect
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COMMON NEUTRALCOMMON NEUTRAL
L
N
L
N
Consumer B
Consumer A
Meter RecordingAs per Neutral
Current (Extra)
As perPhase
current(okay)
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COMMON NEUTRALCOMMON NEUTRAL
L
L
N
Consumer B
Consumer A
15A
15A
15A
15A
15A 15A
15A
5A
(15+5) A
10A
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COMMON NEUTRALCOMMON NEUTRAL
L
L
N
Consumer B
Consumer A
15A15A
15A
15A
15A 15A
15A
0.5A
14.5A
(15+0.5) A
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COMMON NEUTRALCOMMON NEUTRAL
L
L
N
Consumer B
Consumer A
15A15A
15A
15A
15A 15A
15A
5A
10A
(15+5) A
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L
N
L
N
INTERCONNECTED NEUTRALINTERCONNECTED NEUTRAL
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Wiring DefectWiring Defect
Type Of DefectsType Of Defects
Distribution Box Wiring
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DistributioDistribution Boxn Box
1.1. Use of DP- MCB/ IsolatorUse of DP- MCB/ Isolator2.2. Ensure ELCB.Ensure ELCB.3.3. For more than 10 Amp ckts. For more than 10 Amp ckts. Separate MCB.Separate MCB.4.4. Neutral Bus-bar.Neutral Bus-bar.5.5. Correct fuse & wire size.Correct fuse & wire size.
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MCB ELCB FUSE
Proper InstallationProper Installation
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Wiring DefectWiring Defect
Earth (No Neutral)
N-ECommon NCommon PCombination
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Wiring Wiring DefectDefect
Clamp on tester
Bulb tester Line tester Electrician Kit.
Tools
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Clamp on testerClamp on tester
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HOUSE DISTRIBUTION HOUSE DISTRIBUTION BOXBOX
METERMETERMCB / SwitchMCB / Switch
FuseFuse
Neutral
Phase
D. BoxGLOW
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HOUSE DISTRIBUTION HOUSE DISTRIBUTION BOXBOX
METERMETERMCB / SwitchMCB / Switch
FuseFuse
Neutral
Phase
D. BoxGLOW
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Wiring DefectWiring DefectStep-1.
If number of meters in one premise
is only one, then there is no common Neutral problem.
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Step-2. Load OnCheck I phase & I neutral
If I neutral = 0
Earth is used.
Phase
Neutral
METERMETER
EARTH
ELEL NENECommon Common NeutralNeutral
10A
0A
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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
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Step-4.
At MCB
If Phase is Off, then EL OffMeans Neutral-Earth Problem.
Step-5.
If neighbour Phase OffThen EL Off , Means Common wire.
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Phase
Neutral
EARTH
Phase
Neutral
EARTH
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Step-6.
If V EN ≠ 0
Then Earth not touching NeutralStep-7.
If common wire
Disconnect one by one Neutral Ckt. From Bus-bar & see if EL off.
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Step-8.
Once Ckt. Identified then repairThe defect.
Step-9.
Once again check all current.
i.e. Ip = In
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HOUSE DISTRIBUTION HOUSE DISTRIBUTION BOXBOX
METERMETERMCB / SwitchMCB / Switch
FuseFuse
Neutral
Phase
D. BoxGLOW
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Typical Defect Typical Defect Pts.Pts.
Common Load. E.g. Motor
Stair Case Light (i.e. two way switch.
Common Invertors / Generator.
Houses with separate power & light meter.
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Typical Pts. Where Earth Typical Pts. Where Earth gets common with neutralgets common with neutral
Metallic body Appliances.
Appliances connected with metal pipe line.
Building RCC.
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!!Beware !!
Meter can only be touch by Discom (BSES) employee.
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Thank Thank YouYou