team members:advisor: cruz, jaime e.dr. paris wiley dobbs, michael instructor: guzman, frankselcuk...
TRANSCRIPT
TEAM MEMBERS: ADVISOR:CRUZ, JAIME E. DR. PARIS WILEYDOBBS, MICHAEL INSTRUCTOR:GUZMAN, FRANK SELCUK KÖSE OGUNDERE, ADEBOWALE CORPORATE PARTNER:WALLACE, RICHARD
Intelligent Surge Protection Device
EEL 4906 Engineering Design I and Professional Issues
Jaunary 26th 2015
Introduction
SPD’s are electrical devices typically installed in power distribution panels, process control systems, communications systems, and other heavy-duty industrial systems, for the purpose of protecting against electrical surges and spikes, including those caused by lightning.
However, none of the SPD’s in the market allow for remote monitoring of the key components, and they are limited to certain electrical characteristics.
Our Design Concept
Intelligent Surge Protection Device Remote monitoring/reporting User friendly interface (PC software) Improve electrical characteristics of SPD
Fuses Metal-Oxide Varistors (MOV’s) Conducting wires Avalanche diodes
Sensing circuit to measure the degradation of the unit as a whole.
Improve the external design (housing)
SPD FUNCTIONAL DIAGRAM
Areas of Research
Overvoltage sensing circuit Develop a circuit Use an existing patent available to the public Use existing proprietary sensing circuit and treat it as
a black box
MOV’s and Silicon Avalanche
Diodes
Metal Oxide Varistor (MOV):
Highest energy capabilityExcellent reliabilityConsistent performanceBetter mechanical connectivity for paralleling multiple components.Non-liner clamping curve gradually degrades over repeated use (only at high surge levels), moderate capacitance.
Silicon Avalanche Diode(SAD):
Flatter clamping curveExcellent reliability Consistent performanceVery low energy capabilityExpensive.
Varistor IV Curve Avalanche Diode IV Curve
Transient Voltage Suppressor Diodes
Areas of Research
Silicon Avalanche
Surge Suppressor
SASD uses a silicon based diode, similar to a Zener Diode.
SASD response times are faster: 1 ps to 10 ps, compared to 1 ns to 10 ns for MOVs.
They have a sharper bend in the curve around the breakdown voltage; As a result, they can clamp closer to the normal peak voltage
Areas of Research
MODES OF PROTECTION - LINE CONNECTION
L1
L2
L3
Neutral
Ground
7 Modes of Protection
Avalanche Diodes will be added in a way to assist the reaction time of each Varistor (MOV)
Simplified Safe/Fail Circuit Diagram
MOV
MOV
MOV
Micro ControllerInfo. via Wireless Comm.
Info. Receive
d at User PC
Small Magnet Attached to MOV’s fail Indicator
Hall Effect SensorUS1881
Output = High/Low
Implementation of the Hall Effect Circuit
Magnet will be Attached Here
Hall Effect Senor Attached Here
Areas of Research
Arduino UNO Microprocessor Process the information
coming from the various sensors in the device.
Conveys the information to the Wi-Fi module.
Process incoming requests from remote users.
Two-way user interface software Auto-reporting capabilities
defined by the user
User will be able to monitor the status of the SPD’s in real time.
Tools available to create GUI: QT Project
Areas of Research
Wireless Transmission Existing Wi-Fi network is
required. IEEE 802.11 a/b/g/n
HF-A11 modules use UART interface which include 4 general signals: TXD/RXD/RTS/CTS
Add RS-232 chipset to convert the signal to RS-232 voltage to communicate with the device (sensors).
Sleep mode capability while maintaining association with the access point.
Current Current ProposedProposed
Areas of Research: Housing Redesign
Tools Available: SolidWorks is solid modeling
CAD (computer-aided design)
software.3D Printing
UPGRADES TO THE SPD
PRODUCT SPECIFICATIONS
EXISTING PRODUCT SPECIFICATIONS Enhancements
Nominal
Discharge Current
Rating
20kA > 30kA
Maximum Surge
Current Rating
100kA/mode; 200kA/
phase
Fault Current
(SCCR)
200kAIC
Product Design Modular per
mode/phase
Protective
Components
Thermal Protected
MOV’s
Thermally Protected MOV’s
and
TVS Diodes
System Protection 30A Surge Fuses 50A Surge Fuses
Connecting Leads 36 inches 10AWG 36” #8 AWG
Recommended
Breaker Size
30A 50A
Response Time < 1 Nanosecond
Frequency 50/60Hz
Status Indicators Protection Status,
Voltage Presence,
Mechanical MOV
failure
Electronic MOV Failure Status,
Surge Counter
Enclosure Type Metal Thermo-Plastic
Installation
Location
Indoor or Outdoor
Weight 4.4lbs 3.8lbs
Intelligent
Features
Static Device Remote reporting and
monitoring via Wi-Fi,
Sustained Overvoltage
Notification, Surge Notification
Technical Risks
Transient Sensing Circuitry Setting the threshold voltage for detection
MOV and Avalanche Diodes Performance Not switching fast enough could damage Diodes
Failed MOV/Diode Detection Circuitry False indication could leave the user unprotected Hall effect sensor performance in high current
environment
Wireless transmission Location may not have access to a Wi-Fi spot or weak
signal
Tentative Timeline
VISIT OUR WEBSITE HTTP://SMARTSURGEPROTECTOR.WORDPRESS.COM/
CONTACT ANY OF US
CRUZ, JAIME [email protected]
DOBBS, MICHAEL [email protected]
GUZMAN, FRANK [email protected]
OGUNDERE, ADEBOWALE [email protected]
WALLACE, RICHARD [email protected]
QUESTIONS?