Megger TTR25 Instruction Manual Download Page 17

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AVTMTTR25 Rev C April 2008

CONTROLS & CONNECTORS

Overview

The TTR25 is a simple, push-to-test instrument with few buttons and controls. It
has no menus except for a print button and language selection.

Contrast

This knob adjusts the viewing resolution of the screen.

Backlight

A momentary depression of the switch will either activate or
de-activate the backlight. It will remain ON for a period of
three minutes without activity.

Power ON Switch

Press this switch to turn the TTR25 on.

Power OFF Switch

Press this switch to turn the TTR25 off.

DISPLAY SCREEN

LCD displays menus and test information.

KEYPAD

4-button keypad for entering menu selections and
navigating through the various screens.

Figure 3-1 TTR25 Display & Control Panel

Contrast

Display Screen

Power ON switch

Back Light switch

Power OFF switch

Keypad

Summary of Contents for TTR25

Page 1: ...d TTR Transformer Turn Ratio Test Set Catalog No TTR25 High Voltage Equipment Read the entire manual before operating Aparato de Alto Voltaje Antes de operar este producto lea este manual enteramente...

Page 2: ......

Page 3: ...TTR25 Handheld TTR Transformer Turn Ratio Test Set Instruction Manual...

Page 4: ...to change without notice WARRANTY Products supplied by Megger are warranted against defects in material and workmanship for a period of one year following shipment Our liability is specifically limit...

Page 5: ...w 9 Connectors 10 4 SETUP CONNECTIONS AND OPERATION 11 General Instructions 11 Transformers 11 Single Phase Two Winding Transformers 12 Distribution Transformers with Two Secondary Windings 12 Three P...

Page 6: ...ent 29 Troubleshooting 30 Error Messages 31 Repair 33 APPENDIX A SPECIFICATIONS 35 Electrical 35 Environmental Conditions 37 Physical Data 37 Optional Accessories 38 APPENDIX B ORDERING INFORMATION SP...

Page 7: ...Figure 4 5 Setup for Testing X1 X2 Winding of Distribution Transformer 15 Figure 4 6 Setup for Testing X3 X2 Winding of Distribution Transformer 15 Figure 4 7 Setup for Testing X1 X3 Winding of Distr...

Page 8: ...TEST ERROR MESSAGES 31 TABLE 5 4 MISCELLANEOUS MESSAGE 32 TABLE C 1 ANSI TRANSFORMER WINDING PHASE RELATIONSHIP 42 TABLE C 2 ANSI TRANSFORMER WINDING PHASE RELATIONSHIP 44 TABLE C 3 CEI IEC 76 1 1993...

Page 9: ...s both with and without taps in accordance with the requirements of the IEEE C57 12 90 1997 standards For three phase transformers the test set is connected to each of the three phases of the transfor...

Page 10: ...ratio The TTR also measures phase displacement polarity between primary and secondary windings of a transformer and transformer excitation current Transformer Turns Ratio Transformer Turns Ratio is th...

Page 11: ...ed The required test voltage is selected automatically Input and output transformer voltages are applied to conditioning circuitry This circuitry improves signal to noise ratio of the test signal and...

Page 12: ...ocate several types of problems within single and three phase transformers It is used to determine the no load accuracy of CTs and PTs and also determine the need to further test faulty CTs and PTs Th...

Page 13: ...presentative giving a detailed description of the damage This instrument has been thoroughly tested and inspected to meet rigid specifications before being shipped It is ready for use when set up as i...

Page 14: ...M AVTMTTR25 Rev C April 2008 6 M...

Page 15: ...ity to energized high voltage lines or equipment Always disconnect test leads from power equipment before attempting to disconnect them at the test set The ground connection must be the first made and...

Page 16: ...510 1983 IEEE Recommended Practices for Safety in High Voltage and High Power Testing for additional information If the test equipment is operated properly and all grounds correctly made test personne...

Page 17: ...switch will either activate or de activate the backlight It will remain ON for a period of three minutes without activity Power ON Switch Press this switch to turn the TTR25 on Power OFF Switch Press...

Page 18: ...the high voltage H and low voltage X windings of a transformer The plug and receptacle are keyed to prevent the cable from being inserted incorrectly and to make certain that the correct cable is used...

Page 19: ...to the test set or transformer Check that a lead set connected is labeled for TTR25 test set operation The TTR25 has been designed to test a variety of transformers such as Single phase Three phase on...

Page 20: ...hat polarity of the windings is normal sign is displayed in front of the turns ratio test result If the sign is then check the lead connections Distribution Transformers with Two Secondary Windings Th...

Page 21: ...inding X1 X3 connect X1 clip to X1 terminal connect X2 clip to X3 terminal Remove the ground connection to X2 transformer terminal before starting the test Expect that polarity of the windings is norm...

Page 22: ...5 Rev C April 2008 14 Figure 4 3 Setup for Testing Single Phase Type A Straight Design Step Voltage Regulator Figure 4 4 Setup for Testing Single Phase Type B Inverted Design Step Voltage Regulator TT...

Page 23: ...d Figure 4 6 Setup for Testing X3 X2 Winding of Distribution Transformer H2 and X2 Grounded Figure 4 7 Setup for Testing X1 X3 Winding of Distribution Transformer TTR25 H1 H2 H1 LEAD H2 LEAD X1 LEAD X...

Page 24: ...ground and personnel because they could become energized during the test With wye connected windings a neutral connection is normally available Note According to Australian standard wye and delta tra...

Page 25: ...erve proper connections will result in a safety hazard and may result in damage to the test set or CT Failure to observe voltage rating of low current X winding may result in damage to the CT NOTES 1...

Page 26: ...M AVTMTTR25 Rev C April 2008 18 Figure 4 8 Setup for Testing Unmounted Current Transformer Figure 4 9 Setup for Testing Taps on Multiple Tap CT TTR 25...

Page 27: ...rcuit breaker or power transformer entrance bushing The test can be performed without removal of the BCT from the equipment Connect the TTR25 to BCT as shown in Figure 4 10 NOTES 1 Expect that polarit...

Page 28: ...n the menus and test screens in Figures 4 11 through 4 14 are for illustrative purposes only The TTR25 test set menus and test screens are operated by using the keypad On power up the test set perform...

Page 29: ...w 5 the message REPLACE BATTERY UNIT WILL TURN OFF appears on the screen In 10 sec the TTR25 shuts down Replace the batteries six AA size replaceable alkaline batteries before further attempting to in...

Page 30: ...of the test the TEST RESULTS screen Figure 4 14 appears Figure 4 14 TTR25 Test Result Screen The TEST RESULTS screen displays the test voltage used for the test the measured turns ratio the tested win...

Page 31: ...n power on the TTR25 first Pressing after the first test result will provide a header and the data on the print out Each subsequent press of enter will print results data only If a new header is neede...

Page 32: ...Configuration To print a paper copy of the existing printer settings While holding down the On Line switch turn on the printer The following list will print factory default settings shown Figure 4 16...

Page 33: ...up of switches press the FEED switch if all the settings are okay Press the ON LINE switch if a setting needs to be changed At an individual setting press the FEED switch if it is okay and press ON LI...

Page 34: ...M AVTMTTR25 Rev C April 2008 26 M...

Page 35: ...panel Polish with a soft dry cloth taking care not to scratch the display screen cover Clean the cables and mating panel receptacles with isopropyl or denatured alcohol applied with a clean cloth Cali...

Page 36: ...ing connected Such connection cause an impedance mismatch and as a result of the mismatch the displayed turns ratio reading is not exactly 1 1 as it may be expected A customer should be aware that a f...

Page 37: ...minal flat bottom portion of battery should be placed against a battery holder spring The batteries should be installed in series See a battery holder for proper polarity and battery installation orie...

Page 38: ...N POSSIBLE CAUSE Display stays blank after POWER switch is turned on Battery is discharged Contrast potentiometer not adjusted Defective display or electronics Any error message on the screens See ERR...

Page 39: ...than 5 Unit will turn off in 10 sec Replace all six batteries After the batteries are replaced continue testing The test error messages may appear on the screens during testing of transformer The Tabl...

Page 40: ...appear on the screens during printing functions The Table 5 4 below shows the message Table 5 4 Miscellaneous Message Error Message Description of error and action required PRINT ERROR There was an e...

Page 41: ...e attention of the Repair Department Please indicate all pertinent information including problem symptoms and attempted repairs The catalog number and serial number of the test set should also be spec...

Page 42: ...M AVTMTTR25 Rev C April 2008 34 M...

Page 43: ...ty of 3135 mAh are used Pollution Degree TTR25 is designed for Pollution Degree II Regulatory Compliance IEC 61010 1 Environmental Protection Dust and shower protection to IP54 Output Test Voltage and...

Page 44: ...0 25 4001 to 10 000 0 50 10 001 to 20 000 Current rms 2 of reading 1 digit Measurement Method In accordance with ANSI IEEE C57 12 90 Transformer Winding Phase Relationship ANSI C57 12 70 1978 CEI IEC...

Page 45: ...er connection The cable is included in optional printer package Data exchange rate up to 57 6 Kbaud for the field firmware upgrading and 19 2 Kbaud for test report printing on the optional serial prin...

Page 46: ...55 2 The package includes the thermal printer a battery pack an AC adapter and interface cable Test cable 12 ft 3 6 m for single phase transformer testing shielded heavy duty clip end terminated p n 3...

Page 47: ...nstruction manual AVTMTTR25 Optional Accessories Battery line powered serial thermal printer package 120 V ac 35755 1 Battery line powered serial thermal printer package 230 V ac 35755 2 RS232 cable f...

Page 48: ...ery door 55 20003 Knob CONTRAST 55 20004 Battery replacement six required 35956 TTR25 Lead Set 1 8 m 6 ft 35938 TTR25 Lead Set 3 6 m 12 ft 35942 TTR25 Lead Set 6 m 20 ft 36013 TTR25 Lead Set 10 m 33 f...

Page 49: ...through C 4 Then connect the TTR25 test leads to the appropriate transformer winding terminals of phase A Put an external jumper if required After phase A test is complete reconnect the test leads to...

Page 50: ...tion s to ground case of T type transformer on H or X side should be removed before testing a transformer 2 Expect that polarity of the windings is normal sign is displayed in front of the turns ratio...

Page 51: ...nal terminals on HV transformer winding X1 X2 X3 External terminals on LV transformer winding H0 External neutral terminal on HV transformer winding X0 External neutral terminal on LV transformer wind...

Page 52: ...ing Shorted By TTR High Voltage Winding Low Voltage Winding Measured Turn Ratio 1 1 1ph0 1 H1 H2 X1 X2 V V H X 2 1 1ph6 1 H1 H2 X2 X1 V V H X 3 Dd0 A B C H1 H3 H2 H1 H3 H2 X1 X3 X2 X1 X3 X2 V V H X 4...

Page 53: ...oltage Winding Low Voltage Winding Measured Turn Ratio 8 YNyn6 A B C H1 H0 H2 H0 H3 H0 X0 X1 X0 X2 X0 X3 V V H X 9 YNd1 A B C H1 H0 H2 H0 H3 H0 X1 X2 X2 X3 X3 X1 V V H X 3 10 YNd7 A B C H1 H0 H2 H0 H3...

Page 54: ...w Voltage Winding Measured Turn Ratio 14 Dy7 A B C H3 H2 H1 H3 H2 H1 H1 H3 H2 H2 H1 H3 H3 H2 H1 X2 X1 X3 X2 X1 X3 V V H X 3 15 Dyn11 A B C H1 H3 H2 H1 H3 H2 X0 X3 X0 X1 X0 X2 V V H X 3 16 Dy11 A B C H...

Page 55: ...ted By TTR High Voltage Winding Low Voltage Winding Measured Turn Ratio 20 Yyn0 A B C H1 H3 H2 H1 H3 H2 X1 X3 X2 X1 X3 X2 V V H X 21 Yy0 A B C H1 H3 H2 H1 H3 H2 X1 X3 X2 X1 X3 X2 V V H X 22 YNy6 A B C...

Page 56: ...R High Voltage Winding Low Voltage Winding Measured Turn Ratio 26 Yz1 A B C H3 H2 H1 H3 H2 H1 H1 H3 H2 H2 H1 H3 H3 H2 H1 X1 X2 X2 X3 X3 X1 V V H X 3 2 27 Yzn5 A B C H1 H3 H2 H1 H3 H2 X3 X0 X1 X0 X2 X0...

Page 57: ...oltage Winding Measured Turn Ratio 31 Yzn11 A B C H1 H3 H2 H1 H3 H2 X0 X3 X0 X1 X0 X2 V V H X 3 32 Yz11 A B C H3 H2 H1 H3 H2 H1 H1 H3 H2 H2 H1 H3 H3 H2 H1 X1 X3 X2 X1 X3 X2 V V H X 3 2 33 ZNy5 A B C H...

Page 58: ...High Voltage Winding Low Voltage Winding Measured Turn Ratio 37 Yd1 A B C H3 H2 H1 H3 H2 H1 H1 H3 H2 H2 H1 H3 H3 H2 H1 X1 X2 X2 X3 X3 X1 V V H X 3 2 38 YNd5 A B C H1 H0 H2 H0 H3 H0 X3 X1 X1 X2 X2 X3...

Page 59: ...age Winding Measured Turn Ratio 42 Yd11 A B C H3 H2 H1 H3 H2 H1 H1 H3 H2 H2 H1 H3 H3 H2 H1 X1 X3 X2 X1 X3 X2 2 3 V V X H 43 VREG _ 1 _ S SL L SL V V H X 44 Dyn3 A B C H3 H1 H1 H2 H2 H3 X2 X0 X3 X0 X1...

Page 60: ...No IEC Vector Group High Voltage Winding H Low Voltage Winding X Phase Tested Winding Shorted By TTR High Voltage Winding Low Voltage Winding Measured Turn Ratio 48 YNzn1 A B C H1 H3 H2 H1 H3 H2 X1 X...

Page 61: ...winding alternate notation U V W 2U 2V 2W External terminals on LV transformer winding alternate notation u v w 1N External neutral terminal on HV transformer winding alternate notation N 2N External...

Page 62: ...High Voltage Winding Low Voltage Winding Measured Turn Ratio 1 1 1ph0 1 1 1 1 2 2 1 2 2 U1 U2 2 1 1ph6 1 1 1 1 2 2 2 2 1 U1 U2 3 Dd0 U V W 1U 1V 1V 1W 1W 1U 2U 2V 2V 2W 2W 2U U1 U2 4 Dd2 U V W 1U 1V 1...

Page 63: ...ernal Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 9 Dyn1 U V W 1U 1W 1V 1U 1W 1V 2U 2N 2V 2N 2W 2N U2 3 U1 10 Dy1 U V W 1V 1W 1W 1U 1U 1V 1U 1W 1V 1U 1W 1V 2U 2V 2W U1 U2 3 11...

Page 64: ...age Winding Low Voltage Winding Measured Turn Ratio 15 Dyn11 U V W 1U 1V 1V 1W 1W 1U 2U 2N 2V 2N 2W 2N U2 3 U1 16 Dy11 U V W 1V 1W 1W 1U 1U 1V 1U 1V 1V 1W 1W 1U 2U 2V 2W U1 U2 3 17 Dzn0 U V W 1V 1W 1W...

Page 65: ...Winding Low Voltage Winding Measured Turn Ratio 21 Dzn4 U V W 1V 1W 1W 1U 1U 1V 1U 1V 1W 1V 1W 1U 1W 1U 1V 2W 2N 2U 2N 2V 2N 1 5U1 U2 22 Dz4 U V W 1U 1V 1V 1W 1W 1U 2W 2U 2U 2V 2V 2W U1 U2 23 Dzn6 U...

Page 66: ...umpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 27 Dzn10 U V W 1V 1W 1W 1U 1U 1V 1U 1V 1W 1V 1W 1U 1W 1U 1V 2N 2W 2N 2U 2N 2V 1 5U1 U2 28 Dz10 U V W 1U 1V 1V 1W 1W 1U 2U 2W 2V 2U 2...

Page 67: ...ing Low Voltage Winding Phase Tested External Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 33 YNyn6 U V W 1U 1N 1V 1N 1W 1N 2N 2U 2N 2V 2N 2W U1 U2 34 YNy6 U V W 1V 1N 1W 1N 1U...

Page 68: ...Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 38 Yz1 U V W 1V 1W 1W 1U 1U 1V 1U 1V 1W 1V 1W 1U 1W 1U 1V 2U 2V 2V 2W 2W 2U U1 U2 3 2 39 Yzn5 U V W 1U 1V 1V 1W 1W 1U 2N 2U 2N 2V 2...

Page 69: ...Tested External Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 43 Yzn11 U V W 1U 1V 1V 1W 1W 1U 2U 2N 2V 2N 2W 2N U1 3 U2 44 Yz11 U V W 1V 1W 1W 1U 1U 1V 1U 1V 1W 1V 1W 1U 1W 1U...

Page 70: ...pers High Voltage Winding Low Voltage Winding Measured Turn Ratio 48 Yd5 U V W 1V 1W 1W 1U 1U 1V 1U 1V 1W 1V 1W 1U 1W 1U 1V 2W 2U 2U 2V 2V 2W 2 3 U2 U1 49 YNd7 U V W 1U 1N 1V 1N 1W 1N 2V 2U 2W 2V 2U 2...

Page 71: ...inding Ax Bx Cx a2 b2 c2 External terminals on LV transformer winding ax bx cx N External neutral terminal on HV transformer winding n External neutral terminal on LV transformer winding Inaccessible...

Page 72: ...g Phase Tested External Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 1 1 1ph0 1 A2 A1 a2 a1 HV LV 2 1 1ph6 1 A2 A1 a1 a2 HV LV 3 Dd0 A B C A2 B2 B2 C2 C2 A2 a2 b2 b2 c2 c2 a2 L...

Page 73: ...l Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 8 Dy11 A B C B2 C2 C2 A2 A2 B2 A2 B2 B2 C2 C2 A2 a2 b2 c2 HV LV 3 9 Dzn0 A B C B2 C2 C2 A2 A2 B2 A2 B2 C2 B2 C2 A2 C2 A2 B2 a4 n...

Page 74: ...ing Phase Tested External Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 14 YNy0 A B C B2 N C2 N A2 N A2 N B2 N C2 N a2 b2 c2 HV LV 15 Yyn0 A B C A2 B2 B2 C2 C2 A2 a2 b2 b2 c2 c2...

Page 75: ...l Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 20 Yy6 A B C A2 B2 B2 C2 C2 A2 b1 a1 c1 b1 a1 c1 HV LV 21 Yzn1 A B C A2 C2 B2 A2 C2 B2 a4 n b4 n c4 n HV LV 3 22 Yz1 A B C B2 C2...

Page 76: ...Voltage Winding Measured Turn Ratio 26 Yd1 A B C B2 C2 C2 A2 A2 B2 A2 B2 C2 B2 C2 A2 C2 A2 B2 a2 b2 b2 c2 c2 a2 HV LV 3 2 27 YNd11 A B C A2 N B2 N C2 N a2 c2 b2 a2 c2 b2 HV LV 3 28 Yd11 A B C B2 C2 C...

Page 77: ...inding Phase Tested External Jumpers High Voltage Winding Low Voltage Winding Measured Turn Ratio 32 Zd6 A B C A4 C4 B4 A4 C4 B4 b1 a1 c1 b1 a1 c1 HV LV 33 ZNy1 A B C A4 N B4 N C4 N a2 b2 b2 c2 c2 a2...

Page 78: ...M AVTMTTR25 Rev C April 2008 70 M...

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