Transcript Wireless Digital System and its application in EMI

Wireless Data Acquisition
System and its application for
electrical emission measurement
in Substations
Supervised by Dr. W.H.Siew
Presented by Yu Wang
Introduction of electrical emission
measurement in substations
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Purpose: To capture and record EMI signal caused
by the switching actions in substation
Equipment: Sensors, Optical Fibber Links, Digital
Storage Oscilloscopes(DSO), and Computers
Fibre Analog System
Proposal of Wireless Digital
System
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Fiber optical link is Difficult to layout and easy to
be broken
Main promotion: For most convenience and
mobility (why wireless)
To carry an analog signal with 20MHz bandwidth,
it needs too large bandwidth for carrier wave
(why digital)
To take the advantage of modern digital
communication technology to overcome EMI in
the field (why digital)
The structure of new system
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Make up of RAU (Remote Acquisition Unit), wireless
network and application software in PC side
Sensor-1
Sensor-n
RAU-1
RAU-n
Wireless
modem
Remote Acquisition Unit (RAU)
100M A/D Sampling rate
 500K bytes buffer
 UART Interface to wireless modem
 Trigger control functions and all the main
function of a DSO ( Digital Storage
Oscilloscope)
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Block Diagram of Acquisition
RS-232
CPLD
XC95288-LV144
Interface to
MEM
Memory
Interface to
CPU
Interface to
A/D
A/D
Trigger
function
TTL
CPU
RS-485
Wireless network
Point-To-Multipoint Bi-Directional network
 ARQ for concentrative interruption
 FEC for random distributive interruption
 Speed, Distance and license free
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Control platform in PC side
HCI (Human Control Interface) to RAU
 Collection data and save them in local disc
 Separated DSO
Removed
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Wireless modem
Wireless modem
Current stage of development
PC Platform (finished)
 Cable network link (finished)
 Acquisition (finished)
 Replacing Cable link with wireless modem
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Information wanted
Any suggestion for selection of wireless
modem and all the information about such
product are welcomed.
 Contact me by
E-mail: [email protected]
Ext. No: 2108 for James
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