Frequency Response Analysis System
Project Summary
Group G08 - Project Summary
Ngan Thi Thao Tran
Paul Sadowski
Talha Wasif
Xiaotian Peng
Abstract
This project confirms the feasibility of a cost-effective FRA system. The designed
FRA system is capable of displaying the frequency response of an unknown system
between 10Hz and 10Mhz with an adequate level of accuracy for the intended use of
diagnosing faults in power transformers.
The final report describes the development of a cost effective Frequency Response
Analysis (FRA) system. Modern power distribution heavily relies on the use of
power transformers to connect Low Voltage circuits, such as those found in homes
and businesses, to Medium and High Voltage transmission circuits. The maintenance
and repair of these power transformers is integral to the operation of modern power
distribution grids. FRA is a commonly used method for diagnosing electrical and
mechanical faults within a power transformer.
The main objective of this project was to design and implement a cost effective
Frequency Response Analysis system than can be used on power transformers. This
report discusses the function, design, and testing of the various subsystems of the
FRA as well as their integration into a functioning FRA system.
Page 1
Frequency Response Analysis System
Project Summary
Project Specifications
Well designed FRA systems are able to sweep across a large range of frequencies
with a high degree of accuracy and plot the gain response and phase response as a
function of frequency for an unknown test circuit. For a cost-effective FRA system,
the specifications shown in table 1 were chosen as a reasonable operating point for
the system.
Table 1: FRA System Specifications
FRA System Requirement
Test Frequency Range
Power Output
Frequency Resolution
Gain Detection Range
Phase Detection Range
Results Display
Specification
10Hz to 10Mhz
10Vpp at 1A across frequency range
200 Test Points per Decade
0dB to -40dB Nominal Range
0◦ to 180◦
Full Frequency Range Magnitude and Phase Bode Plot
The achieved specifications for the FRA system are shown in table 2.
Table 2: Designed FRA System Specifications
FRA System Parameter
Test Frequency Range
Power Output
Frequency Resolution
Gain Detection Range
Phase Detection Range
Results Display
Specification
10Hz to 10Mhz
10Vpp at all frequencies above 500Hz
7Vpp below 500Hz when test impedance is ≤ 5Ω
200+ Test Points per Decade
Tested range: 0dB to -30dB
Theoretical range: 0dB to -60dB
0◦ to 170◦
Full Frequency Range Magnitude and Phase Bode Plot
The designed FRA system performed adequately within the set design specifications. Further work is needed to the improve the data conversion that occurs within
the micro-controller.
Page 2
Frequency Response Analysis System
Project Summary
Budget
System
Component
Component
Parts
Cost
Amplifier
Power Amplifier
THS309X
$0 (From Previous year)
DC Power Supply
+/- 15V DC Power
supply
$0 (From ECE Department)
Variable Frequency
Oscillator
AD9850
$0 (From Previous year)
Micro Controller
Arduino Yun
$0 (From Previous year)
Coding Environment
Processing
$0
Breadboard
$0 (From ECE Department)
Plexi Mounting Sheet
$0 (From ECE Department)
Wires/ Circuit
Elements
Resistors/
Capacitors/ Inductors
$0 (From ECE Department)
Circuit Simulation
Software
NI Multisim
$0 (From ECE Department)
Word Processing
Software
TeXstudio
$0 (From ECE Department)
Phase & Gain circuit
implementation
AD8302,
Evaluation board
$403.30
Modification Components
SMD Resistors and Capacitors
SMA Connectors
$23.61
Input Source
Interface
Circuit
Component
Software
Comparator
Circuit Board
Total
$426.91
The initially proposed budget was made with a different FRA system topology in
mind. Throughout revisions of the this project, no components listed on the original
budget were purchased.
Page 3