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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

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Presentation Transcript
what is electricity meter

What is Electricity Meter

A device to record Energy consumption.

meter terminology
Meter Terminology
  • No load Test
  • Starting Current
  • Current Range
  • Influence parameters
meter type v s recording
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

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

bses electronic meters
BSES Electronic Meters
  • Specification
          • 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
slide6
FAQ
  • Why Mechanical meter Read less
          • Influence Parameters
          • Age
          • Wear and Tear
          • Narrow Range
          • Mounting
          • Dust and Oil effect
          • Mechanical Counters
slide7
FAQ
  • Why electronic meter are preferred
          • Wide Range
          • Low starting current
          • Less effect of Influence parameters
          • More accurate
          • Temper proof
role of led
ROLE OF LED

N-CUT

CAL LED

EL

REV LED

role of led9
ROLE OF LED

CAL LED

High resolution Out

Put devices for

Meter checking

role of led10
ROLE OF LED

REV LED

  • * Indicate Reverse flow of
  • Energy
  • Reason
  • * Wrong wiring
  • * Use of un isolated
  • Generator/ Inverters
role of led11
ROLE OF LED

EL

  • Due to Unbalance Current.
  • Need Attention
role of led12
ROLE OF LED

N- Cut

  • Indicate Current without
  • Voltage on Meter
  • Contact DISCOM
  • immediately
slide13

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

the neighbors phase / Neutral wire.

Neutral wire is interconnected with the

neighbors neutral wire.

slide14

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 (the neighbours current can flow through your meter)
slide15

Good electronic meters have Current sensorsinboththe

Phase path, and Neutral path

For Measurement it choose higher*of the two current.

* In general Phase current is used for measurement however

if neutral Current more by 10~ 12 % then Neutral current selected

slide16

Electro-mechanical Meter has Current sensoronly on one wire

All Measurement based on phase wire current even when connected to neutral.

slide17

Good electronic meters have Current sensorsinboththe

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”

slide18

KNOW ABOUT EL

If EL ON, 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.

slide19

HOUSE DISTRIBUTION BOX

METER

MCB / Switch

Fuse

Phase

Neutral

D. Box

slide20

NORMAL CONNECTION

I red = I yellow

E mech= Eelect

slide21

NORMAL CONNECTION

I red < I yellow

E mech< Eelect

JUMPER

slide22

INPUT PHASE / NEUTRAL

INTERCHANGE

I red = I yellow

E mech= Eelect

NO EFFECT

NO EFFECT

slide23

NEUTRAL TOUCHING TO EARTH

I white <I red (EL on)

Electronic = I red

Mechanical = I red

EL glow

E mech= Eelect

NO EFFECT

slide24

INTERCHANGE LINE & NEUTRAL

EARTH SHIFTING

EL glow

I red>I white (EL on)

Electronic = I red

Mechanical = I white

Mechanical read less

slide25

INTERCHANGE LINE & NEUTRAL

EARTH SHIFTING

I white = 0

EL glow

I red>I white (EL on)

Electronic = I red

Mechanical = Nil

Mechanical read Nil

slide26

ELECTRONIC METER

RECORD CORRECTLY

No Effect

slide27

COMMON NEUTRAL

Meter Recording

As per

Neutral

Current (Extra)

As per

Phase

current

(okay)

slide28

COMMON NEUTRAL

15A

15A

15A

(15+5) A

15A

5A

15A

15A

15A

10A

slide29

COMMON NEUTRAL

15A

15A

15A

14.5A

15A

0.5A

15A

15A

15A

(15+0.5) A

slide30

COMMON NEUTRAL

15A

15A

15A

10A

15A

5A

15A

15A

15A

(15+5) A

wiring defect
Wiring Defect

Type Of Defects

  • Distribution Box
  • Wiring
slide33

Distribution Box

  • Use of DP- MCB/ Isolator.
  • Ensure ELCB.
  • For more than 10 Amp ckts.
  • Separate MCB.
  • Neutral Bus-bar.
  • Correct fuse & wire size.
slide34

ELCB

FUSE

MCB

Proper Installation

wiring defect35
Wiring Defect
        • Earth (No Neutral)
  • N-E
  • Common N
  • Common P
  • Combination
wiring defect36
Wiring Defect

Tools

        • Clamp on tester
  • Bulb tester
  • Line tester
  • Electrician Kit.
slide38

HOUSE DISTRIBUTION BOX

METER

MCB / Switch

Fuse

Phase

Neutral

D. Box

GLOW

slide39

HOUSE DISTRIBUTION BOX

METER

MCB / Switch

Fuse

Phase

Neutral

D. Box

GLOW

wiring defect40
Wiring Defect

Step-1.

If no. of Meter in one Premise

is only one then there is

no common Neutral problem.

slide41

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

slide42

Step-3.

If Neutral remove from MCB still load working than wiring problem.

If total MCB Off and still load working, then both wire sharing.

slide43

Step-4.

At MCB

If Phase Off, then EL Off

Means Neutral-Earth Problem.

Step-5.

If neighbour Phase Off

Then EL Off ,

Means Common wire.

slide44

Phase

Neutral

EARTH

Phase

Neutral

EARTH

slide45

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.

slide46

Step-8.

Once Ckt. Identified then repair

The defect.

Step-9.

Once again check all current.

i.e. Ip = In

slide47

HOUSE DISTRIBUTION BOX

METER

MCB / Switch

Fuse

Phase

Neutral

D. Box

GLOW

slide48

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.

slide49

Typical Pts. Where Earth gets common with neutral

Metallic body Appliances.

Appliances connected with metal pipe line.

Building RCC.

slide50

!!Beware!!

Meter can only be touch by

Discom (BSES) employee.