Megger PMM-1 Скачать руководство пользователя страница 70

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For example: If the power factor of each of the two legs were Cos 30

then:

√

3/2 = 0.866

√

3/2 = 0.866

Load Power Factor can now be represented in terms of these two components

Load PF =

+ PF

= 0.866 + 0.866 = 1 = Cos

(30

)

√

1.732

%PF = PF(100) = 100%

The following chart is provided as an example of the equality shown in the above equation. Power Factor
may be represented in terms of Cos

or in terms of the summed power factors from each leg of the

circuit divided by the

√

Load

Cos Ø

Cos (30

+Ø)

Cos (30

-Ø)

+ PF

√

Total
Power

-90

0 1/2

-1/2 0 0P

-60

√

3/2

1/2

1/2P

-30

√

3/2 1 1/2

√

3/2

√

3/2P

√

3/2

√

3/2

1 P

√

3/2 1/2 1

√

3/2

√

3/2P

√

3/2

1/2

1/2P

0 -1/2 1/2 0 0P

address and phone number is shown below:

4271 Bronze Way

Dallas, TX 75237-1088

U.S.A.
Phone: (800)

641-2349

Fax:

(214)331-7334

Содержание PMM-1

Страница 1: ...User Manual Model PMM 1 POWER MULTIMETER It is essential that this instruction book be read thoroughly before putting the equipment in service Part No 17357 Rev 14 Date 01 21 2011 ...

Страница 2: ... manual are proprietary with Megger The equipment described herein may be protected by one or more U S letters patent Megger specifically reserves to itself all rights to such proprietary information as well as all rights under any such patent none of which is waived by the submission of this instruction manual to anyone The recipient if a Government agency acknowledges that this instruction book ...

Страница 3: ...TAL SPECIFICATIONS 6 2 6 ORDERING INFORMATION 6 2 7 CHANGES 7 2 8 WARRANTY 7 3 INSTALLATION 8 3 1 UNPACKING AND INSPECTION 8 3 2 PREPARATION FOR USE 8 3 3 REPACKING AND SHIPMENT 8 4 OPERATING INSTRUCTIONS 9 4 1 PANEL CONTROLS AND OPERATING FUNCTIONS 9 4 2 SAFETY CONSIDERATIONS 11 4 3 USING THE INTERNAL BATTERY 11 4 4 GENERAL OPERATING INSTRUCTIONS 13 4 5 SINGLE PHASE OPERATION 13 4 5 1 SELECTING T...

Страница 4: ...27 4 9 1 MODES OF OPERATION 27 4 9 2 THE MEASURING FUNCTIONS 28 4 10 VIEW SAVED DATA Directory 29 4 11 TIMED DATA TRANSMISSION 30 4 12 SETTING THE CLOCK AND DATE 34 4 13 PERIPHERAL OPERATION 34 4 13 1 PRINTER PORT 34 TABLE 4 1 DOT MATRIX PRINTER PORT PIN OUT 35 4 13 2 RS232 SERIAL DATA PORT 35 TABLE 4 2 RS232 CONNECTOR PIN OUT 36 POWER MULTIMETER COMMAND SET 37 CALIBRATION PROCEDURES 41 PMM 1 QUIC...

Страница 5: ...pecifications and procedures 1 2 EXPLANATION OF SAFETY SYMBOLS Megger uses where applicable the following IEC 417 symbols on its instruments This symbol indicates that the operator of the instrument must refer to the instruction manual for further explanation and clarification Safety Ground Terminal This terminal must be connected to an earth ground before making other connections to the instrumen...

Страница 6: ...power cord must be connected to a grounded supply system with proper electrical ratings as indicated on the instrument In the case of detachable power cords only the cord supplied or specified by Megger should be used WARNING TO AVOID ELECTRIC SHOCK ALWAYS DISCONNECT THE POWER CORD FROM THE SUPPLY CIRCUIT BEFORE SERVICING THE INSTRUMENT OR WHEN REPLACING A FUSE WARNING ALL FUSES MUST BE REPLACED W...

Страница 7: ...ULTIMETER is a menu driven instrument equipped with data retention and TIMED data logging capabilities Automatically stores measured data at user defined intervals Transmit them to a PC on a pre programmed time interval or save data directly to NOV RAM memory Other important features include accurate phase angle measurement at very low current levels max hold and the high speed measurement modes 2...

Страница 8: ...hase mode Accurate phase angle measurement at very low current levels Timer mode phase angle between the voltage and current is measured and displayed Auto ranging to reduce test time with manual over ride RS232 data and parallel printer output ports Large easy to read high resolution LCD display Menu driven easy to operate Data storage for saving measured values Programmable Time Data Logging to ...

Страница 9: ...lead or lag with 0 01 resolution Accuracy at 50 60 Hz 0 05 for input levels above 30 Volts and 1 Amps1 0 5 for input levels above 3 Volts and 0 02 Amps 2 input levels below 3 Volts and 0 02 Amps Power 0 100 KW with 0 1 resolution Accuracy at 50 60 Hz 0 1 of VA Reactive Power 0 100 KVAR with 0 1 resolution Accuracy at 50 60 Hz 0 1 of VA Operating Frequency 45 65 Hz with 0 01 Hz resolution Accuracy ...

Страница 10: ...828 Instruction Manual 17357 2 Fuses 1 0 A 250 V 5 x 20 mm MC7797 Accessory Pouch External Mount Portable Case 17355 PMM1 Power DBLite software DB0001 The following optional accessories are available Standard Potential Leads set of 4 2m 835312 Fused Potential Leads set of 4 2m 830213 20 Amps Current Leads States Plugs set of 3 1m 835313 20 Amp Current Leads clips set of 3 1m 835314 100 Amp Current...

Страница 11: ...aulty components at Megger s option but not the cost of travel and living expenses of service personnel for work completed in the field Any field service trips will be subject to inspection of the Megger service representative If it is determined upon arrival that the repair is not covered by the Warranty the customer must be prepared to cover the standard rates of the Megger service representativ...

Страница 12: ...4 should be checked as soon as possible after shipment 3 2 PREPARATION FOR USE THIS INSTRUMENT IS DESIGNED TO BE USED TO MEASURE POTENTIALLY LETHAL VOLTAGE AND CURRENT It is highly recommended that the user familiarize himself with the controls functions and features detailed in section 4 prior to use ALL SAFETY PROCEDURES AND PRECAUTIONS MUST BE FOLLOWED WHEN OPERATING ON LINE WITH LETHAL VOLTAGE...

Страница 13: ... of its full capacity 5 PROTECTIVE GROUND TERMINAL The safety protective chassis ground connection for the instrument This terminal is internally connected to the U ground NOTE The protective ground terminal must be connected to an earth ground before making other connections to the instrument and prior to operating it 6 DISPLAY The display is a high resolution graphic LCD 7 FUNCTION KEYS These pu...

Страница 14: ...dicated by the red terminal and a grey dot 13 START INPUTS Interval timer start binding post connections 14 RESET KEY This key is used to reset the meter in certain measuring screens 15 STOP INPUTS Interval timer stop binding post connections 16 RS232 OUTPUT PORT This port is provided for transmitting and receiving the data results to and from an external PC or a data terminal 17 PARALLEL PRINTER ...

Страница 15: ...ine cord is used 2 Connections should be established to the potential and current terminals before the measuring circuit is energized 3 The use of potential leads containing high rupture fuses is recommended in high KVA circuits 4 All current terminals should be tightly fastened to avoid dangerous terminal voltages and preclude ohmic heating at high currents 4 3 USING THE INTERNAL BATTERY NOTE If ...

Страница 16: ...after using the instrument for a short time or after a whole day 2 Charge the instrument at least once a month if it is stored unused store it connected to a power line 3 If the battery condition has been allowed to deteriorate due to lack of attention charge it for a period of up to 12 hours to allow the charger to recover the condition of the battery ...

Страница 17: ...ltimeter is shipped with default settings Timer Horn Disabled measuring mode 60 Hz and Phase Angles 0 360 Lag To make changes to the settings press the More function key then select SetUp Page2 In the SetUp Page2 screen complete the desired changes then press the OK or Menu key to initialize the changes Note The unit saves the selections changes made in the SetUp Page2 screen Turning the unit OFF ...

Страница 18: ...rent terminals and the voltage is applied between the A and B voltage terminals Ia Vbc For one current and two voltage measurements The current is applied to A current terminals and the voltage is applied between the B and C voltage terminals Ia Vca For one current and two voltage measurements The current is applied to A current terminals and the voltage is applied between the C and A voltage term...

Страница 19: ...rument will display the following 3 Use the SELECT INPUT 1 and SELECT INPUT 2 function keys to configure the measurements Note that certain combinations of input 1 and 2 are not possible The instrument automatically disables these combinations 4 Press the OK function key to activate the measurement 15 ...

Страница 20: ...rror message 2 If the timed data transmission has been activated measured data will be sent to the external device at the set time interval Please refer to section 4 11 for information on timed data transmission 3 The START or STOP inputs respond to a change of state This change may be a dry contact opening or closure or the initial application removal of an AC or DC voltage The input terminals ar...

Страница 21: ... range desired Press CHANGE V RNG to set voltage range desired after making the changes press OK to enter the new configuration Please refer to section 4 7 if an external clamp on current transformer is used 7 Press the ESC function key to return to the Single Phase input selection screen 4 5 3 THE MAX HOLD FEATURE 17 Pressing the MAX HOLD button in the Single Phase Mode will result in the display...

Страница 22: ... even if the AC power cord is used The three phase operation mode is intended for measuring all 3 phase quantities in a wye or delta installation Note Lag displayed phase angles lags the reference in the Lag mode Lead displayed phase angles leads the reference in the Lead mode NOTE Instrument defaults to VAN as the phase reference If current only is to be measured the phase reference must be chang...

Страница 23: ...ontact opening or closure or the initial application of an AC or DC voltage The input terminals are isolated from the chassis ground and are independent of signal polarity 4 To save the measurements press the SAVE function key Pressing this key will TAG NUMBER the sub screen This number is tagged to the saved data for future reference All saved data are time and date stamped 5 The instrument autom...

Страница 24: ...this instrument These ratios are 1000 1 1000 5 3000 1 3000 5 and 200 1 If the clamp on being used does not match any of the pre set options simply move the cursor to the Customize CT or PT There are two manners in which the clamp ons can be utilized 1 Measuring Primary current watts and vars in a single or three phase installation 2 Verifying the ratios of CTs used in relaying and metering install...

Страница 25: ...unit and select the type of measurement Single or Three Phase desired The Power MultiMeter will measure the current or currents by the selected ratio or CUSTOMIZED CT or PT ratio After completion of the CT clamp on measurements it is recommended that the unit be returned to its default setting None or 1 1 Return to the CT ratio screen by following the same steps as previously described or simply t...

Страница 26: ...Main Menu press the SINGLE PHASE function key The following should appear on the display 3 From the single phase screen select IA VAB by pressing the corresponding function key The measurement will be activated 22 ...

Страница 27: ...of short duration a high speed capture mode is available In this mode the update speed is 20 times every second The high speed mode of operation works in conjunction with the START and STOP circuitry allowing the user to capture up to a maximum 60 seconds of test results in a controlled manner IMPORTANT Default ranges are 750 Volts and 100 Amps This mode allows the user to select and set the volta...

Страница 28: ...puts can be used to terminate measurement BEFORE STOP in this mode a maximum of 60 seconds of data can be capture Use the start inputs to initiate the measurement and the STOP inputs are used to terminate the test 4 8 1 THE MEASURING FUNCTIONS 1 From the Main Menu 24 press the SINGLE PHASE function key 2 Select HIGH SPEED CAPTR from the Single Phase screen The following will appear Note that the i...

Страница 29: ...PTR MODE function key will change the capture mode from AFTER START to BEFORE STOP and vice versa as previously explained Note the capture mode is shown on the top right hand corner of the display 5 Manual ranging is also available in this mode of operation To set the desired voltage and current range prior to the measurement Press the CHANGE I and V RANGE function key and the following screen wil...

Страница 30: ... mode the test is automatically terminated depending on selection 15 30 or 60 seconds after it is started 15 sec 300 samples 30 sec 600 samples or 60 sec 1200 samples The START or STOP inputs respond to a change of state This change may be a dry contact opening or closure initial application of an AC or DC voltage and The input terminals are isolated from the chassis ground and are independent of ...

Страница 31: ...oltage or removal of an AC or DC voltage The input terminals are isolated from the chassis ground and are independent of signal polarity NOTE When using the Timer posts in parallel with another test set it is very important that polarity be observed red and black binding post If the binding posts are cross connected the timer will not function correctly 4 9 1 MODES OF OPERATION There are two indep...

Страница 32: ...bled but the voltmeter and ammeter are operating continuously The STOP inputs act as a continuity detector for testing minimum pick up on protective relays When a continuity is detected a horn will sound Use the SETUP PAGE2 screen to disable enable the horn 6 In the TIMER MODE the timer is armed and triggered using the START inputs The ammeter and voltmeter are also running continuously The timer ...

Страница 33: ...rder to activate the transmission of the data to an external printer or PC make the appropriate connection to the PRINTER and RS232 terminals Refer to section 4 13 for more details Press the PRINT ITEM and or XMIT ITEM function keys to initiate the transmission 12 Press ESC to return to the previous screen 4 10 VIEW SAVED DATA Directory POWER MULTIMETER is equipped with a non volatile internal mem...

Страница 34: ...ce by selecting either the PRINT ITEM printer or XMIT ITEM RS 232 function key 4 To clear one or all saved files in the directory press the appropriate CLEAR function key 4 11 TIMED DATA TRANSMISSION For normal single phase or three phase measurement the instrument can be configured so that the data is transmitted to an external PC or printer on a pre programmed time interval The interval is progr...

Страница 35: ...val is selected the user must enter the minutes 1 to 60 at which the data is to be sent to the connected printer 6 Return to the measuring screen desired and make the following changes 7 Select the Set Print Intrvl function key the Print Interval Select screen will be displayed Use the up and down arrow keys to increase or decrease the time of interval transmission 8 Next toggle the cursor from th...

Страница 36: ... Time function key From the TIME DATA LOG SETUP screen use the arrow keys to move the cursor to the optional fields Here the user can Increase or Decrease the Start Stop time and the time interval between each reading 5 Pressing the Default SetUp function key presets the Start Time to the current time and date sets the Stop Time to terminate in 3 days and a Save time interval of 30 minutes between...

Страница 37: ...e screen if a change in harmonics has occurred The user must press any arrow key to measure or update the selected voltage or current The Harmonic Screen has numerous function keys that allows the user to select after making the harmonic measurement Page Down this function key moves the data to the next page Page Up this function key returns the screen to the previous data page Select Input this f...

Страница 38: ...r port is located on the front panel of the instrument and uses a 25 pin delta receptacle Printer SET UP Procedures To send data through the printer parallel port use the following steps 1 From the Main Menu press the MORE function key 2 Select the SetUp Page1 function key to display the System SetUp Menu 3 Use the F1 function key to select either print data once or print data at interval 4 If the...

Страница 39: ...TA BIT 2 OUTPUT 5 DATA BIT 3 OUTPUT 6 DATA BIT 4 OUTPUT 7 DATA BIT 5 OUTPUT 8 DATA BIT 6 OUTPUT 9 DATA BIT 7 MSB OUTPUT 10 ACKNOWLEDGE INPUT 11 BUSY INPUT 19 25 SIGNAL GROUND Other pins are not used 4 13 2 RS232 SERIAL DATA PORT The serial port is located on the front panel of the instrument and uses a 9 pin delta plug The ASCII encoded characters are transmitted at the 19 200 baud rate with one s...

Страница 40: ...TABLE 4 2 Please note the data transmission is unidirectional TABLE 4 2 RS232 CONNECTOR PIN OUT PIN NUMBER DESIGNATION FUNCTION 2 TxD Transmit Data 3 RxD Receive Data 5 GND Signal Ground 7 CTS Clear To Send 8 RTS Request To Send Other pins are not used ...

Страница 41: ... communications software being used on the personal computer Bits per second 19200 Data bits 8 Parity None Stop bits 1 Flow Control None To set up Hyper Terminal to communicate with the PMM 1 do the following Locate Hyper Terminal and open the file Open any ht file A T T mail ht MCI mail ht etc Click on File select new connection message to disconnect will appear Click on Yes The Connection descri...

Страница 42: ...hange and a what string if command was invalid Measurement Type COMMAND Single Phase measure m1 Three Phase Wye measure m3y Three Phase Delta measure m3d Power up Menu mpu Timer Mode mtim Hi Speed Capture single phase mhsc1 Hi Speed Capture 3 phase wye mhsc3y Hi Speed Capture 3 phase delta mhsc3d Single Phase Max Hold m1max 3 Phase Wye Max Hold m3ymax 3 Phase Delta Max Hold m3dmax Single Phase mea...

Страница 43: ...3pphrefr Note once phase angle reference source setting is changed the change is not recognized until 3 phase mode is re entered i e m3y or m3d command is re issued Hi Speed capture mode sends status i e after start or before stop mode setting shscbar changes status K 0 for after start K 1 for before stop shscbaw K See High Speed Capture pg 25 Sends voltage and current range in any mode sranger fo...

Страница 44: ...extctw K K 1 or 200 or 600 or 1000 or 3000 Note You must re issue the m1 m3d or m3y for the change to be recognized Sends rms average voltage setting srmsavgr This setting affects voltage readings in single and three phase wye and delta measure modes only Changes rms average voltage setting srmsavgw K K 0 for rms K 1 for avg Hi Speed Capture Specific arm hi speed capture function hscarm Timer Spec...

Страница 45: ...invalid parameter is returned if either m or n is out of range or string is not complete or improperly delimited send table showing all correction factors cfa write bogus test correction factors cfb update fudge float array cfu Correction Factor x Power MultiMeter Indication 100 accuracy Instrument Correction Factor 1 Correction Factor 1 000 000 Correction Factor Instrument Correction Factor 1 1 0...

Страница 46: ...the present range of the voltage and current Enter the command cfa to retrieve all of the correction factors Select the range in question and enter the command cfr m to retrieve the correction factors for the range in question As an example to retrieve A Phase voltage in the 3 75 range the following commands would be used cfr 0 this would bring back cfr 0 xxxx 7 The xxxx s represent the correction...

Страница 47: ...ormat V25rev K k DSPrev L 1 EXAMPLES SINGLE PHASE Single Phase screen m1 query the readings qr Single Phase custom input selection read s1pcustomr sends channel 1 and 2 input source selections in 0 8 integer format chan1 0 chan2 6 0 Van 1 Vbn 2 Vcn 3 Vab 4 Vbc 5 Vca 6 Ia 7 Ib 8 Ic Single Phase custom input selection write s1pcustomw m n Write channel 1 and channel 2 input source selections same fo...

Страница 48: ... K interval in minutes 1 minute minimum to 60 minutes maximum Note when any other command is executed in this mode the interval query operation is canceled Unlock keypad keyunlock THREE PHASE DELTA Three Phase Delta screen m3d query the readings qr Three Phase mode phase angle reference source selection write s3pphrefw 1 Note once phase angle reference source setting is changed the change is not r...

Страница 49: ...p proceed as follows From the Main Menu press the More key then select SetUp Page2 key Use the up and down arrow keys to move the cursor to any of the preset ratios or customized selection After changes are completed press the OK key to initialize the changes High speed capture samples data at a rate of 20 readings per second and can be used with single or three phase measurements The PMM 1 has th...

Страница 50: ...ommunicate through the RS 232 port using windows terminal hyper terminal or ProComm the following settings are required bits per second 19 200 data bits 8 parity none stop bits 1 and flow control none EXAMPLES ...

Страница 51: ...47 To make a Single Phase IA and VAB measurement press the following function keys Single Phase and IA and VAB the following screen will be displayed ...

Страница 52: ...nts The Single Phase Menu also gives you the option of doing a High Speed Capture measurement on the selected inputs After selecting High Speed Capture the following screen will appear The High Speed Capture screen has several options the user can set before making the measurement It allows the user to change the Trigger Input to the start and stop Timer binding posts 48 ...

Страница 53: ...to the High Speed Capture screen The Power MultiMeter is an auto ranging unit but if the user prefers to set up the Current and Voltage to the expected measurement range just simply press the Change I V Range function key and the following screen will appear IMPORTANT Default ranges are 750 Volts and 100 Amps This mode allows the user to select and set the voltage and current ranges before initali...

Страница 54: ... this mode a maximum of 60 seconds of data can be captured after the measurement is initiated Use the START inputs to initiate the measurement The measurement will automatically abort dependent on selection 15 30 or 60 SEC after it is started Before Stop In this mode a maximum of 60 seconds of data can be captured The start inputs are used to initiate the test and the STOP inputs are used to termi...

Страница 55: ... Volts selection of RMS or AVG mode measurement Print send measured data to a Parallel Printer Save save each measurement to the Saved Data Directory Phase Ref Select change reference point to VAN VBN VCN IA IB or IC High Speed Capture conduct a high speed test for each measurement ESC recalls the previous screen 51 ...

Страница 56: ...gh speed measurement Trigger Input Select make changes to the Timer start and stop binding posts NO or NC contacts Voltage Applied and Voltage Removed Change I V Range change the current and voltage range desired for each particular measurement Capture Mode After Start or Before Stop Arm arms the Power MultiMeter for immediate measurement Select Sample Number allows selection of 15 sec 300 samples...

Страница 57: ... Screen has numerous function key options Page Down selection of this function key moves the cursor down to the next page Page Up selection of this function key moves the cursor up to the previous page View Item selection of this function key displays the highlighted file for view Clear All NV Ram Clears every file saved in the NV Ram Clear Item Clears one file at a time File that is highlighted E...

Страница 58: ...54 ...

Страница 59: ...ess the OK button If CD is not in the D drive enter the appropriate letter 4 Follow the Setup prompts 5 After the program has loaded remove the CD from the computer 6 Restart reboot the computer before executing the program Installation Via Internet 1 Close all applications With your machine connected to the internet Navigate to powerdb com 2 Click on Go To Download 3 Click on Download Power DB Li...

Страница 60: ...he following is a brief description of the Power DB Lite software with the PMM 1 1 Upon opening the Power DB Lite software the user will be presented the Instrument Selection Screen Figure 1 Select Instrument Screen 2 Click on the PMM 1 button The user will then see the Instrument Configuration Screen Figure 2 Instrument Configuration Screen 3 Click on the Serial Port selection button and select t...

Страница 61: ...COM port from the Pull Down window click on OK 1 PH Scan 1 Power DB Lite will automatically open the PMM 1 Single Phase test screen Use the Zoom button or select Tools Zoom Out to reduce the form see an example reduced form in the following figure 57 Figure 3 Single Phase Scan Screen 2 With the serial port properly connected to the PC establish communications with the PMM 1 by clicking on the Init...

Страница 62: ...ly update based upon the SCAN RATE that you set until the STOP button is pressed The Retrieve Saved Data mode retrieves a saved file from the PMM 1 To retrieve the desired file from the PMM 1 go to the PMM 1 MAIN MENU press the View Saved Data function key The Saved Data Directory screen will appear Use the up or down arrow keys to move the cursor to the desired file Press the VIEW ITEM function k...

Страница 63: ...ton to start the process 2 Either press the Stop button when desired or allow the software to continue to record data until the Stop Date and Time are reached 1 PH Hi Speed Pressing the Single Phase High Speed button requires the user to input how many Samples are required 300 600 or 1200 The sampling rate is taken at 20 readings per second thus 300 15 seconds x 20 readings per second 600 30 secon...

Страница 64: ...ired hsc 1pS file then press the View Item function key to recall and display the data 2 From the Power DB 1PH Hi Speed screen mouse click the Retrieve Saved Data hot key to begin transmitting the data 3 PH Wye Scan The 3PH Wye Scan has two modes of operation SCAN and Retrieve Saved Data The display will automatically update based upon the SCAN RATE that you set until the STOP button is pressed Th...

Страница 65: ...d Data Directory screen will appear Use the up or down arrow keys to move the cursor to the desired file Press the VIEW ITEM function key to recall display and verify the data on the PMM 1 To extract the data from the PMM 1 to the Power DB Lite software mouse click on the Retrieve Saved Data hot key 3 PH Wye Mutli Scan Pressing the 3 PH Wye Multi Scan button presents the user with additional setti...

Страница 66: ... following figure Figure 8 Three Phase High Speed capture Screen 1 The 3PH Wye Hi Speed screen is used only when there is a need to retrieve a saved high speed capture file from the Power Multimeter To retrieve the file press the PMM 1 View Saved Data function key Use the up or down arrow keys to locate the desired hsc 3pM file then press the View Item function key to recall and display the data 2...

Страница 67: ...egardless of whether it is distributed throughout a 3 phase wye Y system or a delta configured system Blondel s Theorem suggests that the number of watt meters required to accurately measure energy within a circuit is one less than the number of conductors in that circuit In keeping with Blondel s energy measurement philosophy it becomes necessary to employ a minimum of two watt meters to measure ...

Страница 68: ...ities By selecting the C phase voltage as the reference and tying it to the neutral binding post of the PMM 1 a 3 phase wye ie line to neutral measurement mode can effectively be reconfigured for line to line measurements Line to line voltage measurements can now be obtained using the 3 phase wye mode of measurement The connection diagram in this case would be as follows Therefore the anticipated ...

Страница 69: ...ever when using the two watt meter measurement method Ø will become 30 degrees as a result of using the C phase voltage for our reference in making line to line measurements Now there are only two legs that can have current flow in them according to the above diagram Power in a delta system will now have to be based on the voltages and currents in the remaining 2 legs We will refer to these as PAC...

Страница 70: ... the equality shown in the above equation Power Factor may be represented in terms of Cos θ or in terms of the summed power factors from each leg of the circuit divided by the 3 Ø Load Cos Ø PFAC Cos 30 Ø PFBC Cos 30 Ø PFAC PFBC 3 Total Power 90 0 1 2 1 2 0 0P 60 3 2 0 1 2 1 2P 30 3 2 1 1 2 3 2 3 2P 0 1 3 2 3 2 1 P 30 3 2 1 2 1 3 2 3 2P 60 0 3 2 1 2 1 2P 90 0 1 2 1 2 0 0P address and phone number ...

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