Model ATRT-03 (v) Operating Instruction
7
1.0 Introduction
The model ATRT-03/03A/03B is a microprocessor-based, three-phase, field-portable,
automatic, transformer turns-ratio test meter. The ATRT-03/03A/03B is designed for on-site
measuring of: turns ratios, winding polarity and no-load excitation currents of single phase, three-
phase utility transformers, potential transformers (PTs) and primary current transformers (CTs).
The ATRT-03/03A/03B can be used in the stand-alone or computer control mode. Under computer
control, the user can control the ATRT-03/03A/03B via the RS-232C port with an IBM PC. The
ATRT-03/03A/03B is supplied with single and three-phase hook-up (H & X) cables. Three phase
transformers are tested without changing test leads for each phase tested.
2.0 Applicability
The ATRT-03/03A/03B is available in three models:
a. The ATRT-03 is a line-powered, 120/240 Vac (selectable), 50/60 Hz unit.
b. The ATRT-03A can be powered by 120-240 Vac, or 80-300 Vdc, or 12 Vdc.
c. The ATRT-03B is a line-powered 120/240 Vac (selectable), 50/60 Hz unit without built-
in printer.
3.0 ATRT-03/03A/03B Description
The ATRT-03/03A/03B measures a transformer ratio by applying a test voltage across the primary
(H) winding and then senses the induced voltage on the secondary (X) side. Since there is no load
on the windings during a test, the measured voltage ratio is virtually the same as the winding turns
ratio. Besides measures winding ratios, winding polarity and excitation current (in milliamperes),
the ATRT-03/03A/03B also has the following features:
The ATRT-03/03A/03B allows users to enter nameplate voltages for specified turns-ratio
calculation. Besides calculating the turns-ratio, the ATRT-03/03A/03B also calculates the
percentage of error
based upon the difference between the calculated and measured ratio values.
The ATRT-03/03A/03B allows users to save transformer test records within the FLASH
EEPROM. A typical test record consists of 99 readings of H and X nameplate voltages, phase
A/B/C turns ratios, excitation current and phase angle. Up to 200 records can be stored in the
ATRT-03/03A/03B memory. Stored records can be recalled, printed or transferred to an IBM PC.
The ATRT-03/03A/03B has the capability to store 128 Transformer Test Plans within the
FLASH EEPROM. A test plan allows the user to store transformer nameplate voltages. Using the
nameplate voltages during a test, the ATRT-03/03A/03B can print “PASS” or “FAIL” results on
each of the transformer tests.
A built-in 4.5-inch wide thermal printer (not available with ATRT-03B) allows the user
to print test reports in the field. A 16-key, alpha-numeric keypad allows the user to control and
enter transformer test data.
A built-in RS-232C port allows the ATRT-03/03A/03B to interface with an IBM
compatible PC. A Windows
-based transformer-testing software, supplied with each ATRT-
03/03A/03B, allows users to retrieve test records, create test plans or remotely control the ATRT-
03/03A/03B. Under the computer control mode, users can run a transformer test and save the test
Содержание ATRT-03
Страница 2: ...Model ATRT 03 v Operating Instruction 2...
Страница 26: ...Model ATRT 03 v Operating Instruction 24 Figure 13I Typical Connection for Bushing Mount CTs on Wye Transformer...
Страница 88: ...Model ATRT 03 v Operating Instruction 86 APPENDEX A Table of Standard Transformers...
Страница 89: ...Model ATRT 03 v Operating Instruction 87 APPENDIX B Table of Non Standard Transformers...
Страница 90: ...Model ATRT 03 v Operating Instruction 88 APPENDIX B Table of Non Standard Transformers cont...
Страница 91: ...Model ATRT 03 v Operating Instruction 89 APPENDIX B Table of Non Standard Transformers cont...
Страница 92: ...Model ATRT 03 v Operating Instruction 90 APPENDIX B Table of Non Standard Transformers cont...
