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Harmonics distortion factor THD-R/ THD-F

KEW 2062/2062BT

- 35 -

KEW 2062/2062BT

Harmonics distortion factor THD-R/ THD-F

There are two typical definitions used when dealing with Total Harmonic Distortion (THD).

The two types of Total Harmonic Distortion are THD-F and THD-R. THD-F uses

fundamental wave forms and THD-R uses total RMS values as a reference.

THD-F

[%]

RMS harmonics (2nd to…)

Fundamental RMS value(1st)

×100

THD-R

[%]

RMS harmonics (2nd to…)

Fundamental RMS value+ RMS harmonics

×100

They both are figures of merit used to quantify harmonic levels in voltage and current

waveforms; however, the THD-R measurement can be prone to misinterpretation which

can easily lead to measurement errors when measuring larger distortions. That is, at low

distortion levels, the difference between the two calculation methods - THD-F and THD-R

- is negligible but at large distortion levels, THD-F can get more accurate results.

With the former measuring devices, accurate measurement of RMS fundamental wave

(first order only), which is required for THD-F calculation had been difficult; therefore,

THD-R has been commonly used. Although, recent devices can measure it accurately. So

now in practice, THD-R is used for simple measurements and the distortion factor of

THD-F, less susceptive to harmonics content rate against specified measurement

accuracy, is commonly used.

Where investigating what causes harmonics on load side, THD-R measurement if often

used, and for power quality control purpose, the THD-F is mainly used.

KEW 2062/2062BT

6.5 Phase detection

KEW 2062/2062BT

- 36 -

6.5 Phase detection

Note

●

KEW 2062 / 2062BT cannot measure Three-phase 4-wire with

different capacitors (V/ ∆

connection).

●

When setting the buzzer to “OFF”, buzzer doesn’t sound at the end of detection process.

If buzzer indication is required for phase detection judgement, set the buzzer to “ON”.

Set the function switch to “

“

According to the wiring system of Three-phase 3-wire and Three-phase 4-wire to be tested,

the results are displayed as the following table shows. Each number represents the

connected phase order.

Wiring system

Judgement

R(L1)

S(L2)

T(L3)

Indication

Buzzer

Positive phase

Live Live/

Earth

Live

1.2.3

Discontinuous:

Pi, Pi, Pi

Negative phase

3.2.1

Continuous:

Piii

Unjudgeable

Missing phase,

abnormal frequency,

out of voltage effective

input range, unbalance

-.-.- Not sound.

www.

.com

[email protected]

1.800.561.8187

Содержание KEW 2062

Страница 1: ...Instruction Manual CLAMP POWER METER KEW 2062 2062BT www com information itm com 1 800 561 8187 ...

Страница 2: ... balance Power measurement 23 Connection diagram for Single phase 2 wire 1P2W 23 Connection diagram for Single phase 3 wire 1P3W 23 Connection diagram for balance Three phase 3 wire 3P3W 24 Connection diagram for balance Three phase 4 wire 3P4W 24 Switching display 25 6 3 Three phase unbalance power measurement 26 Three phase 3 wire 3P3W unbalance 26 Three phase 4 wire 3P4W unbalance 29 6 4 Harmon...

Страница 3: ... 2062 2062BT Contents KEW 2062 2062BT 2 Chapter 7 Other functions 37 Data hold function 37 Auto backlight off 37 Auto power off 37 Auto ranging current 37 Chapter 8 Bluetooth communication 38 8 1 KEW Power asterisk features 39 Chapter 9 Specifications 40 9 1 Safety specifications 40 9 2 General specifications 40 9 3 Measurement specifications 41 AC current function 41 AC Voltage function 42 Power ...

Страница 4: ...low the above instructions may cause injury instrument damage and or damage to equipment under test Kyoritsu assumes no responsibility for damage and injury caused by misuse or not following the instructions in the manual The symbol indicated on the instrument means that the user must refer to the related parts in the manual for safe operation of the instrument It is essential to read the instruct...

Страница 5: ...explanations in the instruction manual Instrument with double or reinforced insulation This instrument can clamp a bare conductor where the voltage to be measured is lower than the circuit voltage against earth values specified by the marked measurement category AC Alternating current Functional Earth terminal This instrument satisfies the marking requirement defined in the WEEE Directive 2002 96 ...

Страница 6: ...ceeded Connect the cables that are required for the desired measurement only Connect the test leads to the instrument first and only then connect them to the circuit under test Keep your fingers behind the barrier during a measurement Barrier provides protection against electrical shock and ensuring the minimum required clearance and creepage distances Never disconnect the test leads from the volt...

Страница 7: ...n to the instrument Return the instrument to your local KYORITSU distributor for repair or re calibration in case of suspected faulty operation CAUTION Use of this instrument is limited to domestic commercial and light industry applications Strong magnetic interference or strong magnetic fields generated by large currents may cause malfunction of the instrument Caution should be taken since conduc...

Страница 8: ... calculate voltage current active reactive apparent power power factor voltage current phase differences and frequency TRMS display Harmonics measurement It is possible to measure and show each voltage current harmonic from 1st to 30th in RMS content rate and total distortion factor THD R THD F Phase detection This function is to verify phase rotation and missing phases of power source Application...

Страница 9: ...barrier Function switch Turn and select the desired measurement function This switch also works as power switch set it to OFF to turn off the instrument Data hold switch Holds the displayed readings The LCD shows symbol while the result is being held in the display Mode button 1 2 Toggles the displayed results in the sequences MAX maximum value MIN minimum value AVG average value PEAK crest factor...

Страница 10: ...A long press turns on off the backlight SETUP Item switching button Toggles displayed items and changes the setting values Mode button Selects setting items and confirms the entered values Harmonics Item switching button A short press toggles display THD F THD R 1st fundamental wave to 30th harmonics A long press switches voltage and current RMS values Mode button A short press toggles display Ins...

Страница 11: ...ress resets measurements of MAX MIN and AVG values and resume a measurement Power 3P3W 3P4W Balance Item switching button A short press toggles display active power power factor active and apparent power active and reactive power current and voltage RMS Mode button A short press toggles display Inst value MAX MIN AVG A long press resets measurements of MAX MIN and AVG values and resume a measureme...

Страница 12: ...cording to the polarity of a measured value For further detail please see 9 3 Measurement specifications 3 4 Unit of measured value Unit V RMS voltage A RMS current Hz Frequency kW Active power kVar Reactive power kVA Apparent power PF Power factor deg V A phase difference Harmonics content rate KEW 2062 2062BT KEW 2062 2062BT 12 Chapter 4 Getting started 4 1 Turning on KEW 2062 2062BT Note If the...

Страница 13: ...function might be activated Turn the function switch to OFF and then set the switch to the desired position to wake up the instrument Even though the instrument doesn t wake up the installed batteries may be totally exhausted Please replace the batteries with new ones and try again 4 2 Battery level check DANGER Never try to replace batteries during a measurement WARNING Before opening the battery...

Страница 14: ... and then secure it with the screw KEW 2062 2062BT 4 3 KEW 2062 2062BT 14 4 3 Test leads connection to KEW 2 The followings should be checked before the co DANGE Use only the test leads supplied with this instrum Connect the cables that are required for the des First connect the plug of the test lead to the ins measurement line Never disconnect the test lead from the voltage measurement while the ...

Страница 15: ...ons are noted such as a crack or exposed metal parts CAUTION Confirm that the instrument is powered off and then connect the test leads Connect to the instrument first firmly into the corresponding terminal Connect the test leads per the following procedures 1 Ensure that KEW 2062 2062BT is turned off 2 Connect the test lead to AC voltage input terminal on the instrument The number of test leads t...

Страница 16: ...r Care should be taken so as not to pinch the conductors with the tips of the jaws Confirm and harmonize the wiring configuration of the measurement line and KEW 2062 KEW2062BT When clamping onto a conductor make the arrow mark point towards the load side otherwise polarity of active power P will be reversed and displayed Arrow mark Never clamp two or more conductors KEW 2062 2062BT KEW 2062 2062B...

Страница 17: ...the functin switch to to adjust settings Note Turning the function switch before confirming the altered settings clears all the changes you made Confirm the altered settings and then turn the function switch Item selection Switch the displayed items Press the item switching button to toggle the displayed items and confirm the desired item with the mode button Alter the values of each item with the...

Страница 18: ...m to be tested has external VT s or CT s The set VT CT ratio will be reflected to all the values measured during any measurements related to voltage and current While the LCD is showing VT or CT ratio press the mode button Then 4 digit value is displayed and the changeable digit starts blinking Selectable range is between 0 001 and 9999 The digit selected to be changed will blink KEW 2062 2062BT K...

Страница 19: ...ile the last digit is blinking not a digit position but a decimal point moves A long press of mode button while changing values or digit position cancels the changes and restores the setting to 1 000 Press the mode button to confirm the changes The display returns to the selection screen Measurement using VT CT ratio DANGER This instrument is rated to 300 V AC for CAT IV 600 V AC for CAT III and 1...

Страница 20: ...eady to change the setting Item switching button on Turns off in 5 min oF Disables auto off function Press the mode button to confirm the changes The display returns to the selection screen KEW 2062 2062BT KEW 2062 2062BT 20 Frequency of nominal voltage Set the power frequency of the object to be mea Note Harmonics are calculated based on the pre ment please check and set the same frequ object to ...

Страница 21: ...r frequency of the object to be tested Select Frequency of nominal voltage and press the mode button Then 50 Hz 60 Hz starts blinking that means it is ready to change the setting Item switching button Switches the frequencies Press the mode button to confirm the changes The display returns to the selection screen The set nominal frequency is displayed as left figure at harmonics function System re...

Страница 22: ...AK Peak value AVG Average value Range is fixed while the LCD is showing MAX MIN AVG or PEAK The auto ranging function is reactivated when switching the display to instantaneous value Mode button Mode button Mode button Mode button Mode button KEW 2062 2062BT KEW 2062 2062BT 22 Note When current is measuring current in PEAK m current sensor affects the readings To obta while clamping onto the condu...

Страница 23: ...tor In the PEAK mode sampling is performed in one cycle and PEAK value crest value is determined based on the result The sampling is performed just once in 0 5s therefore the Tester cannot measure a sudden input signal such as inrush current RMS voltage frequency Set the function switch to A shot press of Mode button switches display modes between Inst MAX MIN AVG and PEAK Each of above values is ...

Страница 24: ...ing system in the selection screen Single phase 2 wire 1P2W Three phase 3 wire 3P3W Three phase 4 wire 3P4W Balance Balance Connection diagram for Single phase 2 wire 1P2W Connection diagram for Single phase 3 wire 1P3W To measure Single phase 3 wire 1P3W select 1P2W and measure power of L1 and L2 separately KEW 2062 2062BT cannot show the total power of 1P3W KEW 2062 2062BT Connection di KEW 2062...

Страница 25: ...ire 3P3W Three phase 4 wire 3P4W Balance Balance e phase 2 wire 1P2W e phase 3 wire 1P3W select 1P2W and measure power of L1 and L2 show the total power of 1P3W KEW 2062 2062BT Connection diagram for balance Three phase 3 wire 3P3W KEW 2062 2062BT 24 Connection diagram for balance Three phase 3 wire 3P3W Connection diagram for balance Three phase 4 wire 3P4W www com information itm com 1 800 561 8...

Страница 26: ...n Measured values displayed in the upper and lower rows are switched together Instantaneous value MAX maximum value AVG average value MIN minimum value Range is fixed while the LCD is showing MAX MIN or AVG The auto ranging function is reactivated when switching the display to instantaneous value Mode button Mode button Mode button Mode button KEW 2062 2062BT 6 3 KEW 2062 2062BT 26 6 3 Three phase...

Страница 27: ...stantaneous value Mode button Mode button Mode button KEW 2062 2062BT 6 3 Three phase unbalance power measurement KEW 2062 2062BT 26 6 3 Three phase unbalance power measurement Note KEW 2062 2062BT cannot measure Three phase 4 wire with different capacitors V connection To measure such a system please test phases individually Set the function switch to Select wiring system in the selection screen ...

Страница 28: ...nnection the LCD shows active power of T L3 phase Pressing mode button switches the indications between active power and RMS voltage current values of T L3 phase Another press of item switching button switches the screens to measurement result Mode button Press the item switching button after making connection the LCD shows active power of R L1 phase Pressing mode button switches the indication be...

Страница 29: ...ches the screens to measurement result Mode button KEW 2062 2062BT Three phase 3 wire 3P3W unbalance KEW 2062 2062BT 28 Result display Item switching button Short press switches measured values to be displayed in the LCD Total active power Active power of R L1 Active power of T L2 A long press of mode button clears measured results and the screen returns to the initial screen Total active power Ac...

Страница 30: ...tton switch R L1 phase and RMS voltage current values Another press of item switching button change Clamp onto S L2 phase While the LCD is showing the settings for 2nd following figure shows move the current senso Press the item switching button after makin connection the LCD shows active power of S phase Pressing mode button switches the indication between active power of S L2 ph and RMS voltage ...

Страница 31: ...nd RMS voltage current values Another press of item switching button changes measurement object from R L1 to S L2 Clamp onto S L2 phase While the LCD is showing the settings for 2nd measurement make connection as the following figure shows move the current sensor and red test lead to S L2 phase Press the item switching button after making connection the LCD shows active power of S L2 phase Pressin...

Страница 32: ...een returns to the initial measurement setting screen Mode button KEW 2062 2062BT KEW 2062 2062BT 32 6 4 Harmonics measurement Set the function swi The nominal freque right figure at harmo frequency can be se SET UP function S nominal voltage The LCD screen wil shows during Blue no measured value measured values ca the application on tablet device or by d Current harmonics distortion factor Curren...

Страница 33: ...ng the Bluetooth Current harmonics distortion factor content rate RMS value Current measurement ranges switches automaticay deoending on the measured value When the unit shown in the LCD is V it means the screen is voltage harmonics measurement screen Hold down long press the Item switching button to switch the unit to A Item switching button A short press toggles the displayed measured values RMS...

Страница 34: ...n is current harmonics measurement screen Hold down long press the Item switching button to switch the unit to V Mode button Mode button Mode button Mode button Long press KEW 2062 2062BT Voltage har KEW 2062 2062BT 34 Item switching button A short press toggles the displayed measured RMS Harmonics distortion factor THD F RM Fundamental wave RMS content rate to 30t RMS Harmonics distortion factor ...

Страница 35: ...onics distortion factor THD F RMS Harmonics distortion factor THD R 30th harmonics RMS content rate to Fundamental wave RMS content rate The upper row shows the order of the harmonics 1h to 30h and RMS of each harmonics these two switches every second Mode button A short press switches display mode between Inst MAX MIN and AVG Each of above values is determined after pressing the mode button and m...

Страница 36: ...er measuring devices accurate measurement of RMS fundamental wave first order only which is required for THD F calculation had been difficult therefore THD R has been commonly used Although recent devices can measure it accurately So now in practice THD R is used for simple measurements and the distortion factor of THD F less susceptive to harmonics content rate against specified measurement accur...

Страница 37: ...often pose the THD F is mainly used KEW 2062 2062BT 6 5 Phase detection KEW 2062 2062BT 36 6 5 Phase detection Note KEW 2062 2062BT cannot measure Three phase 4 wire with different capacitors V connection When setting the buzzer to OFF buzzer doesn t sound at the end of detection process If buzzer indication is required for phase detection judgement set the buzzer to ON Set the function switch to ...

Страница 38: ...urrents A range shifts to one upper range when the input exceeds 110 or 300 peak absolute value of the currently selected range and shifts to one lower range when the input drops 90 rms While MAX MIN AVG and PEAK peak value has been selected in the display mode auto ranging doesn t work the selected range is fixed and used KEW 2062 2062BT KEW 2062 2062BT 38 Chapter 8 Bluetooth commun WARNIN Radio ...

Страница 39: ...nstrument and the tablet device away from the wireless LAN devices or turn off the wireless LAN devices or shorten the distance between the instrument and the tablet device It may be difficult to establish communication connection if either the instrument or tablet device is in a metal box In such a case change the measurement location or remove the metal obstacle between the instrument and the ta...

Страница 40: ...pecifications 9 1 Safety specifications Location for use Altitude 2000 m or less in Accuracy guaranteed Temp Hum range 23 C 5 C Relative humid Operating Temp 10 C to 50 C 85 or le humidity range Storage Temp 20 C to 60 C 85 or le humidity range Withstand voltage 5160 V AC 5 sec between current sensor and Insulation 50 MΩ or more 1000 V be resistance Applicable standards IEC 61010 1 2 032 ma Measur...

Страница 41: ...t and enclosure Insulation 50 MΩ or more 1000 V between electrical circuit and enclosure resistance Applicable standards IEC 61010 1 2 032 main unit 031 test leads Measurement CAT IV 300 V CAT III 600 V CAT II 1000V Pollution degree 2 IEC 61326 EMC Class B EN50581 RoHS EN 301 489 1 EN 300 328 EN 62479 and IEC 60529 IP40 9 2 General specifications Readings update rate Approx 0 5 sec on and function...

Страница 42: ...0 A Crest factor 3 or less on 40 00A 400 0A range 3 or less 1500 A peak on 1000A range Accuracy RMS sine wave 40 0 to 70 0 Hz 1 0 rdg 3dgt 70 1 to 1 kHz 2 0 rdg 5dgt Add 0 5 rdg 5dgt to the accuracy for sine waves other than 40 to 70 Hz PEAK value absolute value 40 0 to 70 0 Hz 2 5 rdg 5dgt 70 1 to 1 kHz 4 0 rdg 5dgt Formula A 1 n Ai 2 n 1 i 0 i Sampling point No n Number of samples cycle Current ...

Страница 43: ...KEW 2062 2062BT 42 AC Voltage function RMS AC voltage value ACV Vrms Peak value Absolute value V peak Range 1000V Display digit 4 digit Sampling period One cycle 500 ms Sampling frequency 32 8 kHz every 30 5ɥs PEAK value moving average is 9 points between 40 0Hz and 70 0Hz only Effective input range RMS 30 0 V to 999 9 V Peak value 30 0 V to 1414 V Display range RMS 30 0 V to 1100 VPeak value abso...

Страница 44: ...1P2W L V1 A N V3 1P3W L1 L2 V1 A N V3 Balance 3P3W Psum Ssum cos θ R V1 A S V3 Balance 3P4W Psum P 3 R V1 A N V3 Unbalance 3P3W P1 P2 Psum P1 P2 P1 R V1 A S V2 T V3 P2 R V1 S V2 T V3 A Change the connected points twice and test 2 wattmeter method Unbalance 3P4W Displayed only when measureding each phase P1 P2 P3 Total value Psum P1 P2 P3 P1 R V1 A N V3 P2 S V1 A N V3 P3 T V1 A N V3 Change the conn...

Страница 45: ...digit Same as the active power Effective input range Same as the active power Accuracy 1dgt to the result determined by each measured value Sum add errors of each channel 3P3W 2dgt 3P4W 3dgt Polarity sign No sign Formula S V A When P S P S Wiring system Display value Destination 1P2W 1P3W S Same as the active power 3P3W balance Ssum S 3 3P4W balance Ssum S 3 3P4W unbalance Ssum S1 S2 S3 Sn Apparen...

Страница 46: ... be the average PF Voltage current phase difference θ deg at Single phase 2 wire measurement only Display range 180 0 to 00 to 179 9 The LCD shows when readings are out of the display range of active power Polarity sign Phase delay no sign Phase advance Measurement method Compare current waveform against voltage waveform with zero cross position When S 0 nothig is displayed Polarity sign indicates...

Страница 47: ...rmonics function Measurement method Frequency fixed sampling Perform sampling 256 times per input cycle 50 60 Hz and do FFT calculation Sampling frequency changes depending on the preset nominal frequency 50Hz 12 8ksps every 78μs 60Hz 15 4ksps every 65μs Connect to L V1 N V3 L R S T clamp onto power wires A Effective frequency 50 60 Hz Analysis order 1st to 30th order Window width 1 cycle Window t...

Страница 48: ... THD F Vk 2 30 k 2 100 V1 Fundamental wave V Harmonics voltage k Harmonics order Total harmonics current distortion factor A THD F Display digit 4 digit Display range 0 0 to 100 0 Accuracy 1 against the calculated results of each measured value Formula A THD F Ak 2 30 k 2 100 A1 Fundamental wave A Harmonics current k Harmonics order KEW 2062 2062BT KEW 2062 2062BT 48 Total harmonics voltage distor...

Страница 49: ...ulated results of each measured value Formula V THD R Vk 2 30 k 2 100 Vk 2 30 k 1 V Harmonics voltage k Harmonics order Total harmonics current distortion factor A THD R Display digit 4 digit Display range 0 0 to 100 0 Accuracy 1 against the calculated results of each measured value Formula A THD R Ak 2 30 k 2 100 Ak 2 30 k 1 A Harmonics current k Harmonics order Phase detection function Effective...

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