Vanguard Tri-Phase - Manual (Page 10)

TRI-PHASE OPERATING™ INSTRUCTIONS
10
1.0 Introduction
1.1 Applicability
This manual is applicable to the True Three-Phase Transformer Turns-Ratio (TRI-PHASE™)
Tester model made by Vanguard Instruments Company, Inc.
2.0 General
Description
The TRI-PHASE™ is a true three-phase, field-portable, automatic transformer turns-ratio test
instrument designed to conform to IEEE C57.12.90 measurement method. The TRI-PHASE™ is
designed for on-site measurement of turns-ratios, winding polarity, phase angles, and no-load
excitation currents of single phase and three-phase utility transformers, potential transformers
(PT's), and primary current transformers (CT's)
Since the TRI-PHASE™ is capable of outputting a true three-phase excitation test voltage (for
testing three-phase transformers), it can easily measure turns-ratios and phase angles of Zig-Zag, T
type, special configuration, and phase shifting transformers.
A built-in Load Tap Changer (LTC) controller provides the capability to raise or lower the LTC tap
position from the TRI-PHASE™ front panel.
The TRI-PHASE™ can be controlled from the front panel keypad (Stand Alone Mode) or in
Computer Control Mode with an IBM compatible Personal Computer (PC) via the Universal Serial
Bus (USB) port or RS-232C port.
The TRI-PHASE™ is supplied with single phase and three-phase hook-up cables, LTC control
cables, an RS232 serial cable, a USB cable, and a Microsoft Windows
™
based PC Transformer
Turns Ratio Analyzer (TTRA) software application.
The TTRA software is provided on a compact disk along with the unit. New released TTRA
software and TRI-PHASE
™ firmware are available to all users on the Vanguard Instruments web
site (www.vanguard-instruments.com).