8/18/2019 Single and Three Phase Wattmeter and Energy Meters
1/29
Electrical And Electronics
Instruments
N Krishna Prakash
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
2/29
2
UNIT - 2
ELECTRICAL AND ELECTRONICS INSTRUMENTS
Principle and types of analog voltmeters
Principle and types of digital voltmeters
Principle and types of Multimeter
Single and three phase attmeter
Single and three phase energy meters!
Magnetic measurements
"etermination of #-$ curveMeasurements of iron loss
Instrument transformers
Instruments for measurement of fre%uency and
phase
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
3/29
&nalog Instruments &n analog device is one in hich the
output or display is a continuousfunction of time and 'ears aconstant relation to its input!
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
4/29
(lassi)cation
(lassi)ed 'ased upon the %uantity theymeasure *ammeter+ voltmeter,
(lassi)ed according to the current thatcan 'e measured 'y them!*"(+&(,
(lassi)ed according to the eects usedfor orking!
(lassi)ed as Indicating+ .ecording+Integrating! (lassi)ed on the 'asis of method used
for comparing the unknon %uantity!
*"irect / (omparison measurement ,
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
5/29
Principle of operation Magnetic 0ect!
Thermal 0ect!
0lectrostatic 0ect
Induction 0ect!
$all 0ect!
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
6/29
Magnetic 0ect
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
7/29
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
8/29
1orce #eteen (urrent
carrying Magnet
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
9/29
1orce #eteen To (urrent
(arrying (oils
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
10/29
$all 0ects
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
11/29
perating 1orces "e3ecting 1orce!
(ontrolling 1orce!
"amping 1orce!
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
12/29
Supporting the moving
element Suspension
Taut Suspension
Pivot and 4eel 'earings!
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
13/29
(ontrol Systems 5ravity (ontrol!
Spring (ontrol!
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
14/29
&nalog &mmeters &mmeters are connected in series
in the circuit hose current is to 'emeasured! The poer loss in anammeter is I2.a!Therefore ammeters
should have a lo electrical
resistance so that they cause asmall voltage drop andconse%uently a'sor' small poer!
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
15/29
&nalog 6oltmeters 6oltmeters are connected in parallel
in the circuit hose voltage is to 'emeasured! The poer loss in anammeter is 62/.6!Therefore
voltmeters should have a high
electrical resistance so that theycause a small voltage drop andconse%uently a'sor' small poer!
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
16/29
Types of Instruments
Permanent magnet moving coil*PMM(,!
Moving Iron 0lectro-dynamometer type! $ot ire type!
Thermocouple type! Induction type! 0lectrostatic type!
.ecti)er type!
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
17/29
PMMC
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
18/29
Moving Iron Instruments&ttraction Type
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
19/29
.epulsion Type Moving IronInstruments
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
20/29
0lectrodynamometer Type
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
21/29
7attmeter
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
22/29
Poer Measurement in 8phase 8 ire system
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
23/29
To attmeter method
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
24/29
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
25/29
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
26/29
0nergy meters
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
27/29
Single Phase 0nergy Meter
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
28/29
Poly Phase 0nergy Meter
8/18/2019 Single and Three Phase Wattmeter and Energy Meters
29/29
T$&NK 9U
Top Related