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Tettex TTR 2795, Operating Instructions Manual

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Tettex TTR 2795 Operating Instructions Manual Download Page 45

 

 
 

 

Setting Up Tests 

 

41 

 
 
 
 
 
 
 

7.5

 

Setting Up a transformer with irregularly 

spaced taps 

If the transformer has irregularly spaced taps, or it has taps on the primary as well as the secondary, it is not possible 
for the system to calculate the taps for itself and they have to be entered manually. It is still necessary to set the “Total 
Taps” to a value > 1. This should be set to one less than the total number of ratio possibilities for the transformer. For 
any transformer, if all the possible ratios are to be tested the number to be entered is:   
(Number of inputs on the primary  *  Number of outputs on the secondary) 

The “

HV Nom Voltage

” and “

LV Nom Voltage

” should be set to the nominal output (as defined by the user). This 

is to allow the values to appear on the test report. The user should also set the “

Bot Tap Number

” and “

Nom Tap 

Number

” so the windings are identified correctly. If the measured winding deviation is going to be measured, the “Max 

Deviation” value should be set accordingly. The “Tap Setup” field must be set to “Manual”

.  

After selecting the “Manual” Tap Setup (and “Total Taps” have a value > 1) then the system will display a message 
box: 

 

Pressing “

NO

” will clear the message box and the individual tap voltages will not be set respectively changed. If “

YES

” 

is selected the system will display the tap setup screen: 

 

 

Each tap is indicated with the tap number, the HV voltage and LV voltage. To set the voltage for a particular tap, turn 
the knob until the required tap is highlighted. Clicking the knob will allow the user to enter first the HV and then the LV 
voltage for that tap. Once the taps that are required to be set have been, press “

OK

” to exit from the tap setup screen.  

To change already entered tap values select the “Tap Setup” field as “Manual” again and the tap voltage message 
box is displayed and all tap values are accessible again.

 

 

7.6

 

Loading A Stored Setup For Use 

To load a previously stored instrument setup from the internal memory, select the “

LOAD

” option from the menu at the 

bottom of the 

SETUP

 screen. This will display any information stored in the memory: 

Summary of Contents for TTR 2795

Page 1: ...Operating Instructions HAEFELY TEST AG TTR 2795 Transformer Turns Ratio Meter Version 1 4 ...

Page 2: ... above Version 1 0 2 V1 2 3 09 06 05 LWA Look up tables explained layout work V1 2 4 15 06 05 ThG User Input List V1 2 5 20 3 06 LWA Scope of delivery V1 2 6 17 08 06 LWA New phase cable colours V1 2 7 06 06 07 RSC Modifications in definitions and cabling examples V1 2 8 18 10 07 LWA Intro Note changes V1 2 9 19 02 08 LWA Additional Warnig about RS232 Cable TrafoLookUps corrected V1 2 10 06 10 08 ...

Page 3: ... susceptibility requirements If the unit has been opened the calibration will be rendered invalid In all correspondence please quote the exact type number and serial number of the instrument and the version of software that is currently installed on it The Firmware version is reported at power up Note HAEFELY TEST AG has a policy of continuing improvement on all their products The design of this i...

Page 4: ...asurement Indicates hazards There is a risk of equipment damage or personal injury or death Carefully read and follow the instructions Be sure to follow any safety instructions given in addition to those for the site at which tests are being performed Text in Courier New font denotes text shown on the display of the unit and on screen buttons when described in the text of the operating instruction...

Page 5: ...Connection and Setup 12 4 2 Cable Color Indication 12 4 3 General Notes On Cable Routing 12 4 4 Cable fixing 13 4 5 Single Phase Transformers 14 4 6 Three Phase Transformers 14 4 7 Current Transformers 15 4 8 Bushing Current Transformers 17 4 9 Transformer Look Up Tables 19 4 9 1 Definitions 19 4 9 2 Tables 219 5 Control Knob 30 5 1 Control Knob 30 5 2 Editing Parameters 30 6 Startup 334 6 1 Start...

Page 6: ... Options Information 52 11 Remote Control 573 11 1 RemoteControl 53 11 2 Transfer Protocol 53 11 3 Remote Control System Error Codes 54 11 4 Communications Functions 54 11 5 Test Control Functions 56 11 6 Memory Control Functions 63 11 7 System Setup and Calibration 67 12 Application Software APSW 2795 75 12 1 Application Software APSW 2795 75 12 2 Start up 75 12 3 Structure 77 12 4 Tab Sheet SETU...

Page 7: ...dern microprocessor and gate array technologies to optimize the performance of the system The need for recalibration is kept to a minimum through the use of high quality precision components and self calibration systems 1 2 Scope of Supply The following items are supplied with the standard instrument Qty Description 1 TTR 2795 Turns Ratio Meter 1 High voltage side H measuring cable spider 5m 1 Low...

Page 8: ...load on test object 0 05VA Test circuit protection system USB to RS 232 interface for data download Tap changer interface Suitable for operation indoor and outdoors 1 3 2 Physical and Environmental Specifications Size 406mm x 330mm x 174mm 16 x 13 x 7 Weight 8 8 kg 19 lbs excluding cables Case Material High Impact high visibility resin Environmental protection IP66 case lid closed IP51 case lid op...

Page 9: ... Range Resolution Typical Accuracy Range and Accuracy 0 to 1A 0 1mA 0 3 2 mA Phase Angle Range Resolution Typical Accuracy Range and Accuracy 180 0 01 0 05 1 3 4 User Interface System Display 5 2 dot matrix LCD 240x128 LED Backlight User Controls 4 off Soft keys 1 off Rotary Encoder Control knob 1 off Emergency Stop Memory 100 locations either settings or data Communications RS 232 to USB 19200bau...

Page 10: ...6 Introduction Maximum Roll Diameter Outer 50mm Inner 10mm ...

Page 11: ...in 6 7 removed Do NOT use normal RS 232 or RS 232 to USB cables without removed pins 6 7 This could damage the unit 2 2 Grounding The instrument must always be connected to a grounded power outlet i e a safety earth It must never be operated in a non grounded configuration as this may result in electrical shock to the user or damage to the instrument Where possible the outer casing of the transfor...

Page 12: ...8 Safety instrument and represents a significant safety hazard for personnel Never operate the equipment in an explosive environment or where there are flammable gases or fumes ...

Page 13: ...onnection when the Active lamp is lit voltage may be present on the terminals 4 Tap changer interface connector 5 RS 232 communications port For use with the supplied connection cable ONLY 6 Soft keys these are used to select options to control the system 7 Control knob used to set up values the knob can also be clicked for data entry 8 Emergency Stop this shuts down the output of the system insta...

Page 14: ...e the applied voltage 13 Main display To the top right of the LCD is the display contrast control 11 This can be used to set the contrast of the display to the optimum value for the environment in which the system is being used Press and hold the button until the desired contrast is achieved if the screen is too dark keep the button pressed until it lightens again While the button is held down the...

Page 15: ... roll over the spindle Ensure that the paper is inserted as indicated below the tail of the paper should be towards the rear of the door Insert the end of the paper into the feed slot at the top edge of the printer which should then be fed into the mechanism automatically Once the paper is loaded the automatic feed process will stop Swing the door closed and latch it shut Figure 2 Loading the Prin...

Page 16: ... 2 to LV side X Phase 3 to LV side X Neutral So it s possible to check the correct cable connection to the test object from far even if the description labels are not readable 4 3 General Notes On Cable Routing The measurement of turns ratio requires sensitive voltage measurements to be made It is necessary to minimize the pick up and cross coupling on the cables if the most accurate result possib...

Page 17: ...ar as possible Keep the X cables physically close to each other as far as possible Figure 5 Cable Routing Practice Care has to be taken to minimize the possible effects of common mode interference Particularly when testing transformers with high turns ratios it is recommended that a grounding lead be run between the case of the transformer under test and the grounding post on the front of the unit...

Page 18: ...th the test cables are stacking types The Blue X cable White plug should be stacked onto the Blue H cable Green Plug When connecting to an autotransformer great care should be taken to ensure that the H connection is connected to the top of the winding especially if the transformer has an over wind on it Failure to do this may result in damage to the transformer and the instrument 4 6 Three Phase ...

Page 19: ...ansformers Care has to be made to ensure that the current transformer is connected correctly otherwise there is risk of damage to the CT and Instrument There is also the risk of injury When testing CT not using the CT setting on the software care has to be taken to ensure that the energization voltage does not cause saturation of the transformer core It is recommended that the test voltage is limi...

Page 20: ...ested using either single phase or CT operation If the CT has multiple taps these must be tested individually Each tap on the secondary is tested in turn by connecting the H connections to each tap in turn How this is handled depends on whether the current transformer provides a single winding with multiple taps or separate secondary windings Figure 9 Connecting to Tapped Current Transformers If t...

Page 21: ...imize the inductance of the secondary or primary Suitable jumper cables will need to be provided by the user When testing BCT systems on three phase transformers the method of setting up the measurement depends on whether the BCT are mounted on a Y or a Delta connection The BCT are tested using a three phase configuration though do not use automatic configuration or phase determination The measure...

Page 22: ...18 Connection and Setup Figure 11 Connecting to three phase BCT ...

Page 23: ...correct ratio value The TR VA Va factor determines how the turns ratio is calculated from the ratio of the energizing voltage to the output voltage of the winding The ratio of the measured voltages are multiplied by this factor to give the turns ratio for that winding tap Due to similar reasons the voltage ratio VR and the turns ratio TR is depending on the winding configuration and phase rotation...

Page 24: ...former to determine the turns ratio TR The actual applied configuration depends on the phase rotation of the transformer see the Phase Displacement Info line Example Dyn11 Transformer HV LV 150kV 50kV NHV 520 turns NLV 100 turns TR NHV NL V 520 100 5 2 VR 3 3 3 5 2 VR 150 50 3 TR Turns Ratio VR Voltage Ratio NHV Number of HV windings NLV Number of LV windings ...

Page 25: ...ed connections should be considered 1 st and not only the Phase indication A B or C Example 2 It must be clear that the ratio for a YNy0 Phase A H1 H2H3 X1 X2 not only shows the faults related to Phase A VECTOR GROUP TABLE OLD New HV LV Displ Phase Winding Winding VR TR YN yn 0 A H1 H0 X1 X0 H1 H0 X1 X0 1 YN yn 0 B H2 H0 X2 X0 H2 H0 X2 X0 1 YN yn 0 C H3 H0 X3 X0 H3 H0 X3 X0 1 YN yn 2 A H1 H0 X2 X0...

Page 26: ...X2 X1 1 YN y 10 C H3 H0 X2 X1X3 H3 H1H2 X3 X2 1 YN zn 1 A H1 H2H3 X1 X0 H1 H2H3 X1 X0 1 154700538 YN zn 1 B H2 H1H3 X2 X0 H2 H1H3 X2 X0 1 154700538 YN zn 1 C H3 H1H2 X3 X0 H3 H1H2 X3 X0 1 154700538 YN zn 3 A H1 H2H3 X2 X0 H1 H2H3 X0 X2 1 154700538 YN zn 3 B H2 H1H3 X3 X0 H2 H1H3 X0 X3 1 154700538 YN zn 3 C H3 H1H2 X1 X0 H3 H1H2 X0 X1 1 154700538 YN zn 5 A H1 H2H3 X3 X0 H1 H2H3 X3 X0 1 154700538 YN...

Page 27: ...1 X2X3 H3 H1H2 X1 X2 1 154700538 YN z 11 A H1 H0 X3 X1X2 H1 H2H3 X1 X3 1 154700538 YN z 11 B H2 H0 X1 X2X3 H2 H1H3 X2 X1 1 154700538 YN z 11 C H3 H0 X2 X1X3 H3 H1H2 X3 X2 1 154700538 YN d 1 A H1 H0 X2 X1 H1 H0 X1 X2 1 732050808 YN d 1 B H2 H0 X3 X2 H2 H0 X2 X3 1 732050808 YN d 1 C H3 H0 X1 X3 H3 H0 X3 X1 1 732050808 YN d 3 A H1 H0 X3 X2 H1 H0 X3 X2 1 732050808 YN d 3 B H2 H0 X1 X3 H2 H0 X1 X3 1 73...

Page 28: ...2 H3 X2 X1 1 D d 10 C H3 H2 X2 X1 H3 H1 X3 X2 1 D yn 1 A H1 H3 X1 X0 H1 H3 X1 X0 0 577350269 D yn 1 B H2 H1 X2 X0 H2 H1 X2 X0 0 577350269 D yn 1 C H3 H2 X3 X0 H3 H2 X3 X0 0 577350269 D yn 3 A H1 H3 X2 X0 H2 H3 X1 X0 0 577350269 D yn 3 B H2 H1 X3 X0 H3 H1 X2 X0 0 577350269 D yn 3 C H3 H2 X1 X0 H1 H2 X3 X0 0 577350269 D yn 5 A H1 H3 X3 X0 H1 H2 X0 X1 0 577350269 D yn 5 B H2 H1 X1 X0 H2 H3 X0 X2 0 57...

Page 29: ...D y 11 A H1 H2H3 X3 X2 H1 H2 X1 X2X3 0 577350269 D y 11 B H2 H1H3 X1 X3 H2 H3 X2 X1X3 0 577350269 D y 11 C H3 H1H2 X2 X1 H3 H1 X3 X1X2 0 577350269 D z 0 A H1 H2H3 X1 X3 H1 H2H3 X1 X3 0 666666667 D z 0 B H2 H1H3 X2 X1 H2 H1H3 X2 X1 0 666666667 D z 0 C H3 H1H2 X3 X2 H3 H1H2 X3 X2 0 666666667 D z 2 A H1 H2H3 X2 X1 H1 H2H3 X1 X2 0 666666667 D z 2 B H2 H1H3 X3 X2 H2 H3H1 X2 X3 0 666666667 D z 2 C H3 H1...

Page 30: ... H1H3 X3 X0 H2 H1H3 X3 X0 0 666666667 D zn 8 C H3 H1H2 X1 X0 H3 H1H2 X1 X0 0 666666667 D zn 10 A H1 H2H3 X3 X0 H1 H2H3 X0 X3 0 666666667 D zn 10 B H2 H1H3 X1 X0 H2 H1H3 X0 X1 0 666666667 D zn 10 C H3 H1H2 X2 X0 H3 H1H2 X0 X2 0 666666667 Y yn 0 A H1 H2H3 X1 X0 H1 H2H3 X1 X0 1 Y yn 0 B H2 H1H3 X2 X0 H2 H1H3 X2 X0 1 Y yn 0 C H3 H1H2 X3 X0 H3 H1H2 X3 X0 1 Y yn 2 A H1 H2H3 X2 X0 H1 H2H3 X0 X2 1 Y yn 2 ...

Page 31: ...2 X3 1 Y y 10 B H2 H1H3 X1 X2X3 H2 H1H3 X2X3 X1 1 Y y 10 C H3 H1H2 X2 X1X3 H3 H1H2 X1X3 X2 1 Y z 1 A H1 H2H3 X1 X3 H1 H2H3 X1 X2 1 154700538 Y z 1 B H2 H1H3 X2 X1 H2 H1H3 X2 X3 1 154700538 Y z 1 C H3 H1H2 X3 X2 H3 H1H2 X3 X1 1 154700538 Y z 3 A H1 H2H3 X2 X1 H1 H2H3 X3 X2 1 154700538 Y z 3 B H2 H1H3 X3 X2 H2 H1H3 X1 X3 1 154700538 Y z 3 C H3 H1H2 X1 X3 H3 H1H2 X2 X1 1 154700538 Y z 5 A H1 H2H3 X3 ...

Page 32: ...00538 Y zn 11 A H1 H2H3 X3 X0 H1 H2H3 X0 X3 1 154700538 Y zn 11 B H2 H1H3 X1 X0 H2 H1H3 X0 X1 1 154700538 Y zn 11 C H3 H1H2 X2 X0 H3 H1H2 X0 X2 1 154700538 Y d 1 A H1 H3 X1 X2X3 H1 H2H3 X1 X2 1 732050808 Y d 1 B H2 H1 X2 X1X3 H2 H3H1 X2 X3 1 732050808 Y d 1 C H3 H2 X3 X1X2 H3 H1H2 X3 X1 1 732050808 Y d 3 A H1 H3 X2 X1X3 H1 H2H3 X3 X2 1 732050808 Y d 3 B H2 H1 X3 X1X2 H2 H3H1 X1 X3 1 732050808 Y d ...

Page 33: ...H1H2 X1 X2 1 5 Z d 10 A H1 H3 X3 X1X2 H1 H2H3 X3 X1 1 5 Z d 10 B H2 H1 X1 X2X3 H2 H3H1 X1 X2 1 5 Z d 10 C H3 H2 X2 X1X3 H3 H1H2 X2 X3 1 5 ZN d 0 A H1 H3 X1 X2X3 H1 H2H3 X1 X2 1 5 ZN d 0 B H2 H1 X2 X1X3 H2 H3H1 X2 X3 1 5 ZN d 0 C H3 H2 X3 X1X2 H3 H1H2 X3 X1 1 5 ZN d 2 A H1 H3 X2 X1X3 H1 H2H3 X3 X2 1 5 ZN d 2 B H2 H1 X3 X1X2 H2 H3H1 X1 X3 1 5 ZN d 2 C H3 H2 X1 X2X3 H3 H1H2 X2 X1 1 5 ZN d 4 A H1 H3 X...

Page 34: ...66025403 Z y 11 A H1 H3 X3 X1X2 H1 H2 X1 X2X3 0 866025403 Z y 11 B H2 H1 X1 X2X3 H2 H3 X2 X3X1 0 866025403 Z y 11 C H3 H2 X2 X1X3 H3 H1 X3 X1X2 0 866025403 Z yn 1 A H1 H3 X1 X0 H1 H3 X1 X2X3 0 866025403 Z yn 1 B H2 H1 X2 X0 H2 H1 X2 X3X1 0 866025403 Z yn 1 C H3 H2 X3 X0 H3 H2 X3 X1X2 0 866025403 Z yn 3 A H1 H3 X2 X0 H2 H3 X1 X2X3 0 866025403 Z yn 3 B H2 H1 X3 X0 H3 H1 X2 X3X1 0 866025403 Z yn 3 C ...

Page 35: ... X1X2 H1 H3 X2 X3X1 0 866025403 ZN yn 9 C H3 H2 X1 X2X3 H2 H1 X3 X1X2 0 866025403 ZN yn 11 A H1 H3 X3 X1X2 H1 H2 X1 X2X3 0 866025403 ZN yn 11 B H2 H1 X1 X2X3 H2 H3 X2 X3X1 0 866025403 ZN yn 11 C H3 H2 X2 X1X3 H3 H1 X3 X1X2 0 866025403 ZN y 1 A Not implemented H1 H3 X1 X2X3 0 866025403 ZN y 1 B in TTR2795 H2 H1 X2 X3X1 0 866025403 ZN y 1 C Firmware Version H3 H2 X3 X1X2 0 866025403 ZN y 3 A older t...

Page 36: ...s up To change or edit the selected line item press PUSH the knob the system then enters an edit screen and allows the value to be edited When the parameter has been edited and confirmed the system returns back up to the parameter selection list 5 2 Editing Parameters After entering the edit screen the cursor will stand on the first edit field There are three types of edit Fields Number List and T...

Page 37: ...p to the superior parameter selection list Text A select character box is shown above the edit field By rotating the knob the desired character can be selected By pressing the knob the character is taken to the edit field and the cursor jumps to the next position Jump one field back by pressing PREVIOUS DELETE sets the edit field back to default empty By pressing CANCEL the system returns back up ...

Page 38: ...ration The date of the last factory calibration of the instrument With the soft keys in the bottom line the single sub menus can be entered SETUP To set up test configurations DUT parameters etc TEST To run a test MEMORY To access all stored data OPTIONS To set global system options like date time etc The Startup display is re entered from any sub menu by pressing the UP key until the leftmost but...

Page 39: ...he TTR will detect the Phase Displacement Full automatic User sets HV Config to Auto 3 ph Auto 3 ph selection means that the TTR will try to detect the vector group of the transformer HV Config The HV Config sets the winding configuration of the HV side of the transformer The options for setting the LV Config and Ph Displacement may or may not be displayed depending on the HV configuration selecte...

Page 40: ...number of taps sets whether the transformer is tapped or not and the number of taps on the transformer If there are no taps on the transformer the Total Taps should be set to one If only the LV or HV winding is tapped it should be set to the number of taps plus one i e the number of outputs If the transformer is tapped on both the HV and LV sides then the Total Taps is set to the total number of p...

Page 41: ...d off the last test setup is maintained in the memory and is available as soon as the unit is turned back on In the Setup menu the user has four option buttons UP Moves the system back to the top level menu LOAD Loads a test setup from the internal memory ready for use The display shows a list of setups and test results stored on the system Highlight the required one using the rotary control and p...

Page 42: ...btained the user must ensure that the H and X leads are correctly connected to the system otherwise a phase displacement will be introduced which the software cannot compensate for When testing a single phase transformer or a CT the HV Config should be set to Single in this case it is not necessary to enter a phase displacement 7 3 Setting Test Voltage It is important to select the appropriate tes...

Page 43: ... sets the voltages for the nominal output It is then necessary to set up the number of the bottom tap Bot Tap Number and the number of the nominal tap Nom Tap Number The way these are set up depends on the Tap Numbering option in the Options screen The numbering can be set up as alphabetic a b C D or numeric 1 0 1 2 3 It is also necessary to set up the step between each tap Step Tap to Tap This is...

Page 44: ... 23kV 1 1kV 0 235kV 0 nominal 1kV 0 24kV 1 1kV 0 245kV 2 1kV 0 25kV 3 1kV 0 255kV 4 1kV 0 26kV 5 1kV 0 265kV 6 1kV 0 27kV 7 1kV 0 275kV 8 1kV 0 28kV Using Tap stepping entered in percentage set HV Nom Voltage 1kV HV Nom Voltage 0 24KV Total Taps 16 Nominal output plus 15 additional Bot Tap Number 7 Nom Tap Number 0 Tap Setup LV Step Tap to Tap 2 083 Using Tap stepping entered in voltage set HV Nom...

Page 45: ...x Deviation value should be set accordingly The Tap Setup field must be set to Manual After selecting the Manual Tap Setup and Total Taps have a value 1 then the system will display a message box Pressing NO will clear the message box and the individual tap voltages will not be set respectively changed If YES is selected the system will display the tap setup screen Each tap is indicated with the t...

Page 46: ...essing CANCEL returns to the main setup screen 7 7 Saving a Setup Once a setup has been defined it can be saved to memory by pressing the SAVE button This displays a number entry edit box which is preset to the next available memory To save the data into this memory press OK Otherwise enter the required number as described in section 4 3 If there is no available memory the system will report that ...

Page 47: ...Setting Up Tests 43 Tap 2 1 of 5 HV 3 0 kV LV 0 90kV Tap 1 2 of 5 HV 3 0 kV LV 0 95kV Tap 0 3 of 5 HV 3 0 kV LV 1 0kV Tap 1 4 of 5 HV 3 0 kV LV 1 05kV Tap 2 5 of 5 HV 3 0 kV LV 1 0kV END OF REPORT ...

Page 48: ...asured If the configuration has been set but automatic phase displacement determination is being used the phase displacement is reported as until the first phase has been measured The Phase Descr field indicates the test configuration used for the last phase that has been measured The Tap field shows the tap being measured the number of taps that have been measured and the total number of taps on ...

Page 49: ... running the testing process there are a number of conditions that will halt the testing process altogether requiring the test to be re started these errors are No Cables Connected The system has failed to detect cables on either the H or the X socket Check that the cables are firmly locked onto the sockets If extension cables are being used ensure that the cables are connected the correct way rou...

Page 50: ...iders that the connections to the transformer are reversed it measured a turns ratio of less than 0 8 it reports If this message box appears check the connections are attached to the transformer correctly that the X cables are connected to the low voltage terminals of the transformer Also check that there is no residual voltage on the transformer or that there is no significant voltage being induc...

Page 51: ...o signal the end of the test Testing a Tapped Transformer Using The Front Panel When testing a tapped transformer from the front panel the sequence of operations is slightly different from when an untapped transformer is being tested Once the connection checking process the configuration determination process and the phase displacement determination process are completed the system stops and produ...

Page 52: ...s pressed to start the test for that tap The lamp on the button will extinguish while the test is in process Once the test for that tap is finished the lamp will illuminate again to indicate that the tap can be changed When the tap is set the user presses the button to perform the test The instrument takes approximately 20 seconds to measure a three phase transformer if the button does not illumin...

Page 53: ... DUT Location Tested By Operator Instrument TETTEX2795 Serial No 1234 56 78 Date Of Test 09 22 04 Time of Test 08 23 45 Test Voltage Auto Max Deviation 0 5 Configuration Auto 3ph HV Nom Volt 3 0 kV LV Nom Volt 1 0kV Total Taps 4 Bottom Tap 2 Nominal Tap 0 Step Tap Tap 0 05kV For set of measurements on the transformer the instrument reports the measurements in this format Tap 2 1 of 5 HV 5 00kV LV ...

Page 54: ...p number while the Y axis indicates the turns ratio running from the minimum value recorded to the maximum In the upper right hand corner of the graph the system indicates the currently selected tap and the turns ratios measured for that tap A vertical line drawn on the graph indicates the currently indicated tap In the lower right hand corner the instrument displays a legend which can be switched...

Page 55: ...pending on whether the memory is a setup memory or a test memory Next to that the system shows whether the memory is a setup or a test memory The last column shows which location the memory is using To select a memory rotate the control knob until the required memory is highlighted by a box around it This memory can then be viewed or deleted by using the control buttons UP This returns the instrum...

Page 56: ...e report only has a single set of measurement results and no tap identification information is displayed If the transformer is tapped the report shows the tap identification and where it is in the sequence of taps For each phase the report indicates the turns ratio the deviation of that turns ratio from the nominal the phase shift between primary and secondary and the current drawn On the right ha...

Page 57: ...y is a setup the configuration is split up into Primary configuration secondary configuration and phase displacement If the primary configuration is set to Auto 3ph Single or CT then the secondary configuration and phase displacement Fields are not shown For a test memory beneath the basic setup information the display shows the test configuration for each of the phases tested Phase Descr A H1 H2H...

Page 58: ...ugh the values Press OK to return to the SHOW memory screen Deleting Memory Information The highlighted memory can be deleted by pressing the DELETE button This displays a message box asking for confirmation Press the new DELETE button to delete the data or CANCEL to return to the memory menu without deleting the data ...

Page 59: ...nit Numeric or Alphabetic in which the tap identification is done Debug Report If this option is set ON then the printer prints out additional measuring and debug values to support an eventual bug fix or function improvement So if the user faces any problem with the measurement of a test object with this instrument the Debug Report has to be set ON and the printout together with other related info...

Page 60: ...l number of this instrument also shown in the stat up screen FirmWare Version The Version of the actual used firmware system software Last Calibration The date of the last factory calibration of the instrument Next Calib The date of the next recommended factory calibration of the instrument ...

Page 61: ...delimiting the boundary between Fields except for the start of the first field of a message where the next character after the start character is assumed to be the first field character is the message terminator character which must be enclosed within field delimiter characters is a literal control character inserted into a field string before a or character to indicate the following character is ...

Page 62: ...ory is used already ES_MEMFREE 0x0903 Requested memory has no data ES_MEMCORRUPT 0x0904 Memory data is corrupted ES_MEMOOR 0x0905 Memory Index out of range ES_MEMFULL 0x0906 Memory is full ES_TAPOOR 0x0907 Tap number out of range ES_NOCONN 0x0908 Connection refused ES_VECTORINV 0x0909 Vector group invalid ES_VOLTINV 0x090A Voltage Invalid ES_BADBOTTAP 0x090B Bottom tap invalid ES_MEASRUN 0x090C Me...

Page 63: ... trying to connect via the RS 232 port and the system is currently printing The remote should retry the connection periodically to see if connection can be gained Communications Close This closes down the communications link and ends remote control Structure C C Fields None Returns OK indicates the connection has been closed Comments The TTR will generate no response if it is either shut down or t...

Page 64: ...e vector group of the transformer to be tested Structure T S V VectorGroup TestVoltage Fields VectorGroup integer is the vector group of the transformer under test This is an integer value that determines the configuration of the transformer and the phase displacement Bits 15 12 determine the HV winding configuration bits 11 8 determine the LV winding configuration and bits 7 0 determine the phase...

Page 65: ... of taps the bottom tap the nominal tap the tap setup and the step voltage value on the system The HV Nominal Voltage and LV Nominal Voltage have to be set before setting the Tap values Structure T S T NumTaps BotTap NomTap StepValue Fields NumTaps integer is the number of taps on the transformer A value of zero indicates no taps on the transformer A value of one indicates a single tap i e 2 outpu...

Page 66: ...checking performed on the HV and LV voltages Test Setup IndividualTap This sets the primary and secondary voltages for the individual tap to be measured Structure T S I TapNo HV Voltage LV Voltage Fields TapNo integer is the number of the tap being set This is in the range 0 to NumTaps If a value outside this range is entered the system will generate an error HV Voltage float is the boilerplate vo...

Page 67: ...902 Working Memory has data ERROR 0300 No update test running Comments None Test Info Operator This sets up the operator testing the unit Structure T I O Operator Fields Operator string is a 20 character user identification string Returns OK The Operator ID has been updated ERROR 0902 Working Memory has data ERROR 0300 No update test running Comments None Test Info Deviation This sets up the maxim...

Page 68: ... 0x00 Test system is not running a test TS_CONN 0x01 Test system checking for correct connection TS_CONFIG 0x02 Test system checking configuration TS_DISP 0x03 Test system measuring phase displacement TS_MEAS 0x04 Test system measuring ratio TS_TAPWAIT 0x05 System waiting to test next tap TS_SYS 0x06 Checking System Integrity TS_VOLT 0x07 Determining test voltage TS_FIVDLFT 0xF8 Floating input vol...

Page 69: ...integer is the vector group of the transformer under test This defines the configuration of the transformer and the phase displacement Bits 15 12 indicate the HV winding configuration bits 11 8 indicate the LV winding configuration and bits 7 0 indicate the phase displacement The possible values for the winding configurations are 0x00 Delta 0x01 Star no neutral 0x02 Star With neutral 0x03 Zig zag ...

Page 70: ...de Type string is the 20 character manufacturers type code Operator string is the 20 character operator code Deviation float is the maximum acceptable turns ratio deviation TimeDate float is the Time and Date of the test Comments None Test Results Taps This returns the result for the individual taps on the transformer Structure T R T TapNum Fields TapNum integer is the number of the tap for which ...

Page 71: ... for which the results are to be shown If the transformer is not tapped this should be 0 The maximum value is NumTaps Returns OK HV LV TRA IA PA TRB IB PB TRC IC PC Pass The results of the test ERROR 0907 The value of TapNum is out of range ERROR 090E The value of NumTap is valid but that tap has not been measured This will occur if the test was halted before completion HV float is the boilerplate...

Page 72: ... memory and therefore must be transferred from the working memory into the internal memory if they are to be retained in the instrument Memory Initialise This initializes the memory system Structure M I Fields None Returns OK Comments This function should be used with extreme care It resets the whole of the memory system to the empty state All data stored in the memory is lost Memory CheckFree Thi...

Page 73: ...he specified memory location Structure M W MemNo Fields MemNo integer is the number of the memory into which the data in the working memory is to be transferred This is in the range 1 to 100 0x0001 to 0x0064 Alternatively if a MemNo of 0 0x0000 is specified the contents of the working memory are transferred into the first available memory Returns OK MemNo Data has been written in memory MemNo ERRO...

Page 74: ...No MemNo is the number of the next available memory block If this is zero the memory is full and there are no blocks available Comments None Memory Read Setup Returns the basic setup parameters for the specified memory Structure M R S MemNo Fields MemNo integer is the memory number to be read This is in the range of 0 to 100 Returns OK VectorGroup Voltage HVNomVoltage LVNomVolatge NumTaps BotTap N...

Page 75: ...ch is either in Volts or a percentage of the nominal tap voltage based on the Step Unit set A negative step value indicates that the tap is on the HV side A positive step value indicates that the tap in on the LV side A step value of zero indicates that the tap voltages should be set manually MeasTap integer indicates the number of taps that have actually been measured If a test has been performed...

Page 76: ... measured phase shift for phase A TRB float is the measured turns ratio for phase B IB float is the measured energization current for phase B PB float is the measured phase shift for phase B TRC float is the measured turns ratio for phase C IC float is the measured energization current for phase C PC float is the measured phase shift for phase C Pass integer indicates whether all three phases are ...

Page 77: ...type was set successfully ERROR 0006 Calibration Jumper not inserted ERROR 0007 Error writing the data Comments This parameter is used on the test report and as part of the startup screen to indicate the identification of the instrument If the string is longer than 16 bytes including the terminating null it is truncated and the terminating null placed in the last place Setup calibrator This sets t...

Page 78: ...ibration information before and after it is set up The values read back depend on whether they have been updated by the user during the calibration session If the values are changed then those changes will be reflected in the data returned when the calreadInfo function is called Setup CurrentTimE This sets the real time clock Structure S E TimeDate Fields TimeDate is the time and date to be set Re...

Page 79: ...o ranging off The remote software should never assume the state of the auto ranging system but should explicitly set it whenever it is needed Setup SetConfiguration This sets the configuration of the test circuit Structure S C Configuration Voltage Fields Configuration integer is the configuration of the test circuit switching matrix It is the bit wise combination of the specified HV and LV config...

Page 80: ...gs This returns the current raw unprocessed meter readings and measurement status Structure S M Returns OK PriV SecV PriI Status PriV integer is the primary voltage magnitude SecV integer is the secondary voltage magnitude PriI integer is the primary current magnitude Status integer is the current status of the measurement system The lowest 8 bits onstitute a rolling counter This is updated each t...

Page 81: ...ec Volts Range 512 26 Pri Volts Range 8 Sec Volts Range 1024 27 Pri Volts Range 8 Sec Volts Range 2048 28 Pri Volts Range 8 Sec Volts Range 4096 29 Not Used 30 Not Used 31 Current Measurement Factor 32 Secondary Current Burden Resistance Returns OK Factor Factor float is returned ERROR 0910 The requested factor was out of range Comments This function returns the data held in the EEPROM rather than...

Page 82: ...ary phase difference in degrees Status integer is the current status of the measurement system The lowest 8 bits constitute a rolling counter This is updated each time a new meter reading is taken by checking this rolling counter the user can determine whether the meter readings have updated since last time they were read The upper bits carry status information for the metering system as follows D...

Page 83: ... top bit of the flags register is set i e the standard flag position is set the flag setting is not updated but the function returns the current flag register setting This allows the current configuration of the system to be determined ...

Page 84: ...is one of the following 0 Do not change Step Unit this allows the Step Unit to be queried 1 Set to Step Unit to VOLT 2 Set to Step Unit to PERCENT Returns OK StepUnit The Step Unit was set successfully ERROR 0007 Error writing the data Comments The zero value allows the remote host to query Step Unit of the transformer The function returns the Step Unit Setup TapNumbering This sets the Standard fo...

Page 85: ...creen The APSW 2795 is especially designed for easy gathering exchanging and analyzing of measuring data 12 2 Start up After the software has been properly installed the program can be started by clicking the TTR icon The program supports two modes a normal mode which is used for measurements and a simulation mode which can be used for making post processing preparing measurement setups or trainin...

Page 86: ...o use a template to save a file or to create a new file The button is always shown throughout the program The functions of the individual elements can be summarized as follows Button New By pressing this button the File Selector Dialog pops up where you can enter a name for the new file All further measured data will be stored in this file Button New based on Template If this button is pressed the...

Page 87: ...e top of the window tab bar on the right hand side of the window three tab sheets can be selected which allow access to the main functions of the program SETUP MEASURE ANALYSIS key bar at the bottom of the window a key bar is located which includes all buttons necessary to perform measurements prepare setups or analyze test results The buttons are case sensitive i e they change according to the se...

Page 88: ... TTR 2795 is connected but the program is started in the normal mode the message TTR 2795 not connected is shown The Simulated mode provides the same functionality as in the real mode but no system hardware is needed The measuring values are simulated Help Button Pressing this button will open an explorer with help screen Minimize Button The display of the software will be minimized and you have a...

Page 89: ...Tab Sheet SETUP This tab sheet consists of following sub chapters Menu DUT Info All general information about the device under test can be entered in this panel See section Menu DUT Info for more information Menu Trafo Data In this panel the rating and the configuration of the transformer under test can be specified If the transformer is equipped with a tap changer it can also be defined here See ...

Page 90: ...labeled Notes Menu Trafo Data Here the transformer winding system is defined and rated Although the TTR 2795 detects automatically the vector group and phase displacement if known it will be manually entered in this menu If a winding system is equipped with a tap changer the corresponding check box Tap Changer should be activated and the corresponding tap number and steps should be entered by clic...

Page 91: ...Application Software APSW 2795 87 The following dialog pops up when clicking Tap Parameters The Tap parameters can be entered here in the same way as in the firmware of the instrument itself ...

Page 92: ...o If the tap voltages are evenly distributed they can be calculated automatic By pressing the button the minimal and maximum tap voltage can be entered and the single tap voltages are evenly calculated and filled in the list If the tap voltages are not evenly distributed the final values in the list can be edited by the user ...

Page 93: ...up This button allows you to select the startup of the system By pressing this button a list appears where you can select your startup mode Quick Startup System will start directly in manual mode File Manager System will start automatically with FileManager dialogue Load Last File The file with which you have worked the last time will be automatically loaded The system will continue at the same pl...

Page 94: ...ed all inputs where stored in a file After pressing first few character all window will popup with all stored values So it is very easily to make you inputs Drop down list Data Storage With this button it is possible to select in which file format the data are stored XML Extended Markup Language All data are always stored in this data format This format is text based and can be read by any editor ...

Page 95: ...ware APSW 2795 91 Menu Auxiliary Here you can enter your own documentation fields The title and field of each line can be free defined by the user All titles and text field are also shown in the final printed document ...

Page 96: ... the high voltage and the middle tap position T0 of the low voltage winding will be measured with a voltage of 40 V Only the taps which have been activated and defined in Menu Trafo Data can be selected Control of Test Procedure At the bottom of the window the buttons for start and stop a measurement are shown If a test is started by clicking Test a Single Tap the program adopts the selected tap c...

Page 97: ...et Status Measuring When this status message is shown the instrument applies the specified voltage to the DUT and measures the current Status Checking Configuration During the time when this status is active the system tries to determine the correct vector group of the transformer e g Dyn Status Checking Displacement This is the last status which appear during a measurement The instrument tries to...

Page 98: ...e if the voltage ratio is linear with the tap changer position The axis of the graphic can be configured by clicking the Fields or Different views can be defined by pressing A Menu with following buttons will popup Button Add View Pressing this button will store the actual graphic under a free definable name Button Rename View Pressing this button will rename the actual view Button Delete View Pre...

Page 99: ...l is used to analyze several files at the same time The feature is especially helpful if you want to analyze the measured data from different test objects Analysis File Selection Pressing the button will open the following dialog in which you can manage files for analyzing The descriptions of the buttons are as follow Button Add File Pressing this button will add a file to the list Button Remove F...

Page 100: ...ore the actual list in a file Button Load List Pressing this button will load a list from a file Button Show Analysis Pressing this button will open a dialog with all files from the list Analysis with data from different files All selected measurement files are shown here By pressing the column name File Name you can manage this list See related chapter for details ...

Page 101: ...Application Software APSW 2795 97 ...

Page 102: ... the appropriate technical literature or the internet www w3 org At the top of the explorer window a small header with check boxes and a print link is placed With this menu the elements which should be displayed in the report can be controlled It is possible to hide or display the test sequences the measurement values and the analysis window Clicking on the Logo on the right side of the explorer w...

Page 103: ...e solution with an additional kit to generate three phase supply from a single phase source means extra cables and cumbersome to transport and use In the Tettex TTR 2795 arbitrary phase shift APS measurement is achieved by using a single phase supply and with no extra hardware as elaborated earlier The necessary three phase equivalent voltages at different transformer terminals are simulated by en...

Page 104: ... a small window pops up and prompts the user to give in the activation code Obtain the activation code from Tettex Haefely Test AG Once the correct activation code is given a message pops up see image below confirming that arbitrary phase shift module is activated ...

Page 105: ...ation of the transformer For example Delta delta Delta star etc Example Transformer 3ph Rated power 5500 kVA HV 11000 2x2 5 V LV1 2202V Vector group Dd11 75 or phase displacement 7 5 Vector group Dd 0 75 or phase displacement 22 5 Images courtesy Trasfor Lugano Switzerland This is the case of a transformer having at least two three phase windings with primary and secondary side winding of the tran...

Page 106: ... 5 The resulting display is as follows for vector group Dd0 75 For the case of a transformer having at least one winding in three phase and one winding in single phase with the primary side winding of the transformer configured as delta the vector group settings on the primary and secondary should be set up as shown in the image below ...

Page 107: ...Application Software APSW 2795 103 The remaining steps to turns ratio and phase shift measurement are as detailed earlier in section 12 5 ...

Page 108: ...venient tap changer testing After the TTR has measured a tap it stands by waiting for the operator to move the transformer tap changer to the next tap position and continue the TTR measurement by pressing CONTINUE on the unit The tap changer operation box on power transformers is normally not placed at the same place where the TTR2795 is placed The external tap switch cable allows the operator to ...

Page 109: ...nitely be avoided In particular the protective glass of the display should be cleaned from time to time with a soft moist cloth such as used by opticians Instrument Calibration When delivered new from the factory the instrument is calibrated in accordance with the calibration report provided A periodical calibration of the instrument every two years is recommended As the calibration process is fai...

Page 110: ...ent is constructed of metal parts mostly aluminum and synthetic materials The various component parts can be separated and recycled or disposed of in accordance with the associated local rules and regulations 14 6 Customer Support All error messages appear on the display of the TTR 2795 measuring instrument If persistent problems or faulty operation should occur then please contact the Customer Su...

Page 111: ...Miscellaneous 107 14 7 Conformity ...

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