Megger FRAX Series User Manual

4. Quick start tutorial
4.1. Preparatory procedures
This tutorial provides an introduction on how to use FRAX and FRAX software. They are intentionally kept
brief so that user can start using the instrument and software as quickly as possible. The objective is not to
teach user every single detail but to familiarize with the basic principles.
IMPORTANT
Always follow the safety instructions in this manual. Always comply with local safety regulations.
1. The transformer must be disconnected from the net, which means that any connection to the trans-
former bushings including neutral(s) must be disconnected.
2. The transformer tank must be properly grounded.
A. If the transformer is equipped with a Load Tap Changer (LTC), the position of the LTC will inuence
the SFRA measurement. The recommendation is to put the LTC in the position to include all tap
windings in circuit (“Extreme Raise” position) and note that this LTC position is used. When making
measurements at several tap positions, make sure to note each tap position.
B. If the transformer is equipped with a De-Energized Tap Changer (DETC), the position of the DETC
will inuence the SFRA measurement. The recommendation is to leave it at the nominal tap position
unless otherwise specied. Make sure to note the DETC position in the Nameplate section of the
software.
3. Connect the FRAX instrument to station earth/ground near the power transformer to be measured
using the separate earth/ ground wire (at bottom of transformer if instrument is operated beside the
transformer, at another good connection to transformer at top of transformer if instrument is used on
top of transformer). The separate earth/ ground wire should be the rst connection made and the last
removed.
4. Connect the test lead BNC connectors to the FRAX instrument, Generator (yellow), Reference (red) and
Measure (black).
5. Connect the AC/DC Adapter to the FRAX and a power source that meets local safety regulations and the
AC/DC Adapter specications or use optional in-built battery supply.
6. If not using Bluetooth communication, connect the USB cable to the FRAX and computer.
7. Turn on the FRAX.
4.2. Ground loop control
1. Press GLD button to verify ground loop continuity.
If LED is red, check ground connections at transformer and bushings.
2. Start FRAX-software on PC and establish communication, see Establish Communication
4.3. Start FRAX and establish communication
▪ If using Bluetooth communication: Establish Bluetooth communication, see also detailed description
Bluetooth Wireless Communication. Usually, a serial port number will be assigned, e.g., 8, that should be
used when FRAX establish connection. Note that FRAX Software remembers the last used port.
▪ If using US communication: Connect the USB cable to the computer and to the FRAX. The computer
should display a message that it found new hardware
1. Start FRAX software
2. Connect to FRAX by selecting "Connect" from menu File, by clicking "Connect" button on the right hand
side of software window or by using F7 key.
Quick start tutorial
www.megger.com FRAX-series 19

Megger FRAX Series Specifications

General

Brand	Megger
Model	FRAX Series
Category	Measuring Instruments
Language	English