THDPM-1

By-EMBUILT TECHNOLOGIES

www.embuilt.comwww.energylogger.blogspot.com

Embuilt.tech@gmail.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