THDPM-1
By-EMBUILT TECHNOLOGIES
www.embuilt.comwww.energylogger.blogspot.com
(THD MEASUREMENT WITH EXAMPLES AND FIGURES)
Date-01/09/2014
THDPM-1
Auxiliary Supply : 180 – 240 VoltsInput Voltage : 0 – 240 VoltsCurrent : 0 – 2.0 A*(200mA,500mA range are also available)
Measures upto 51st HarmonicAccuracy Class : 1%Voltage HarmonicsCurrent Harmonics
INTRODUCTION
THDPM-1 is THD analyzer which measures upto 51st harmonic.
It provides Voltage and Current THD. It shows the net effect on THD due to load. It also shows following parameters-
VoltageCurrentWattFrequencyPower Factor
It is useful for testing of LED Drivers, SMPS, CFL, CHOKES etc.
MAIN PAGE
VOLTAGE
CURRENTWATT
PF
VOLTAGE THD
CURRENT THD
NET THD
(Frequency and PF shows alternately )
Press to see Voltage Harmonics
VOLTAGE THD PAGE
3rdHarmonicVoltage
5th Harmonic
7th Harmonic
Voltage rms Value
1st Harmonic
THD %
Press to see more Harmonics (Upto 51st harmonic can be seen)
Press to see Current Harmonics
Press to see Previous Harmonic
CURRENT THD PAGE
3rd Harmonic
Current
5th Harmonic7th Harmonic
Current rms Value
1st Harmonic
Current THD %
Press
to see more Harmonics
Press to see Previous Harmonic
TEST BENCH SETUP
THD ANALYSIS
Experiment 1
Lets start testing with only bulb load.
We take a 100 Watt bulb load and connect it to load side.
Voltage THD is 2.90% and Current THD is 4.85%.
So bulb cause a small Distortion in current.
WITH BULB LOAD
EXPERIMENT 1 PART AVOLTAGE THD
EXPERIMENT 1 PART BCURRENT THD
WITH CFL LOAD
Experiment with only CFL load.
We take a normal 14 Watt CFL and connect it to load side.
Voltage THD is 3.56% and Current THD is 26.99%.
A CFL distorts the current more.
Experiment 2
EXPERIMENT 2 PART AVOLTAGE THD
EXPERIMENT 2 PART BCURRENT THD
WITH BULB AND CFL LOAD
Experiment with BULB and CFL load.
BULB specification is 100 Watt . CFL specification is 14W. Voltage THD is 3.23% and Current THD is
5.99% . BULB has more power than CFL and also
linear in nature so it tends to decrease the current distortion.
Experiment 3
EXPERIMENT 3 PART AVOLTAGE THD
EXPERIMENT 3 PART BCURRENT THD
WITH BULB AND CAPACITOR LOAD
Experiment with BULB and CAPACITOR.
We take a capacitor of 3.15µF and connect to load side with a normal BULB load.
Voltage THD is 3.12% and Current THD is 15.34%.
A capacitor also distorts the current.
Experiment 4
EXPERIMENT 4 PART AVOLTAGE THD
EXPERIMENT 4 PART BCURRENT THD
WITH LAPTOP LOAD
Experiment with Laptop load.
We take a laptop and connect it to supply with charger of 65watt.
Voltage THD is 7.92% and Current THD is 113.1%.
AC to DC Converters provides high distortion in current.
Experiment 5
EXPERIMENT 5 PART AVOLTAGE THD
EXPERIMENT 5 PART BCURRENT THD
WITH BULB AND LAPTOP LOAD
Experiment with Laptop and Bulb load.
We Connect Bulb and Laptop at load side. Voltage THD is 8.83% and Current THD is
69.59% . A linear load reduces the current distortion. BULB has more power than Laptop Charger and also
linear in nature so it tends to decrease the current distortion.
Experiment 6
EXPERIMENT 6 PART AVOLTAGE THD
EXPERIMENT 6 PART BCURRENT THD
WITH LED DRIVER LOAD
Experiment with LED and LED Driver Load.
We Connect LEDs at load side through LED Driver.
Voltage THD is 1.68% and Current THD is 133.9% .
LED Driver produces high distortion in current.
Experiment 7
EXPERIMENT 7 PART AVOLTAGE THD
EXPERIMENT 7 PART BCURRENT THD
WITH LED BULB LOAD
Experiment with LED BULB.
We Connect LED at at load side. Voltage THD is 2.55% and Current THD is
63.40% . LED Driver produces distortion in current.
Experiment 8
EXPERIMENT 8 PART AVOLTAGE THD
EXPERIMENT 8 PART BCURRENT THD