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Appendix C

AVTMTTR25 Rev C April 2008

Notes to Table C-2

Transformer terminal markings for distribution and power transformers marked in
accordance with requirements of

American National Standard Institute, Inc

(ANSI) standard C57.12.70 – 1978.

Definition of Symbol Designations

, H

External terminals on HV transformer winding.

, X

External terminals on LV transformer winding.

External neutral terminal on HV transformer winding.

External neutral terminal on LV transformer winding.

Inaccessible neutral point on HV or LV transformer winding.

Nameplate voltage rating (line-to-line) of HV transformer winding.

Nameplate voltage rating (line-to-line) of LV transformer winding.

A, B, C

Winding tested on HV side of transformer.

a, b, c

Winding tested on LV side of transformer.

Содержание TTR25

Страница 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...

Страница 2: ......

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

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