Vanguard ATRT-03_03B S2 - Manual (Page 7)

REV 2 ATRT-03 S2, ATRT-03A S2, AND ATRT-03B S2 USER’S MANUAL
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1.0 INTRODUCTION
1.1 General Description and Features
The ATRT-03 S2 line is Vanguard’s third generation family of microprocessor-based, automatic,
three phase, transformer turns-ratio testers. The ATRT-03 S2 line consists of the following three
models:
• The ATRT-03 S2 is a line-powered, 100-240 Vac, 50/60 Hz turns-ratio tester featuring a
built-in thermal printer.
• The ATRT-03A S2 can be powered either by an internal rechargeable lead acid battery,
by 100-240 Vac, or by a 12 Vdc external source. The internal battery provides 3 hours of
operational time. The ATRT-03A S2 also features a built-in thermal printer.
• The ATRT-03B S2 is a line-powered, 100-240 Vac, 50/60 Hz turns-ratio tester without a
built-in thermal printer.
The general term “ATRT-03 S2” or “ATRT” is used in this manual to refer to any of the ATRT-03
S2 models. Any differences are clearly described where applicable.
The ATRT-03 S2 determines the transformer turns-ratio using the IEEE C57.12.90 measurement
method. The ATRT-03 S2 outputs an excitation test voltage to the transformer’s primary
windings. The induced secondary voltage is sensed and the transformer turns-ratio is
calculated. The unit can measure turns-ratios from 0.8 to 15,000. The transformer turns-ratio,
excitation current, and phase-angle readings are displayed on the large back-lit LCD. The built-in
transformer type detection feature allows the ATRT-03 S2 to detect and test 130 transformer
types defined by ANSI, CEI/IEC and Australian standards.
The ATRT-03 S2 can be used as a stand-alone unit or can be computer-controlled. It can be
operated locally using its alpha-numeric keypad and rotary switch. Information is displayed on a
back-lit LCD screen (64 x 128 dot graphic) that is viewable in both bright sunlight and low-light
levels. Test reports can be printed in the field on the unit’s built-in 4.5-inch wide thermal
printer (ATRT-03 S2 and ATRT-03A S2 only). The ATRT-03 S2 can store up to 112 test records
and 128 test plans in Flash EEPROM. Test records or test plans can be stored or transferred to
and from a PC via the available interfaces (RS-232C port, USB port, USB Flash drive port).
Transformer Test Voltage
To prevent an accidental wrong test-lead hook-up (e.g., when the operator reverses H and X
leads), the ATRT-03 S2 outputs a low-level test voltage to verify the hook-up condition before
applying the full test voltage to the transformer. Three test voltages (8 Vac, 40 Vac, 100 Vac)
allow the ATRT-03 S2 to test CT’s and PT’s, as well as power transformers.
Auto-Detect Transformer Configuration
The ATRT-03 S2 can automatically detect 130 specific vector groups for different transformer
types defined by ANSI, CEI/IEC, and Australian standards.