1. Intelligent Surge Protection Device EEL 4906 Engineering Design I and Professional Issues
Team Members: Advisor:
Cruz, Jaime e. Dr. Paris Wiley
Dobbs, Michael Instructor:
Guzman, Frank Selcuk Köse Ogundere, Adebowale corporate partner:
Wallace, Richard
JAIME
Jaunary 26th 2015

2. 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.
RICHARD

3. 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)
Dozens of competing SPD’s available by a multitude of manufacturers.
None are “intelligent” devices.
According to PowerLogics, some manufacturers are working on “intelligent” type devices to do remote reporting, but none are currently patented or available to consumers.
Distinguish between sustained overvoltage and a surge and notify the user via WiFi.

4. SPD FUNCTIONAL DIAGRAM
WALE

5. 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
High power indicator circuit: A high power transistor is used to detect high voltages. If the input voltage rises above the set threshold of the resistor on the base of the transistor, the transistor will conduct giving an high value which indicates the presence of an overvoltage.

6. MOV’s and Silicon Avalanche Diodes
Areas of Research
MOV’s and Silicon Avalanche Diodes
Metal Oxide Varistor (MOV):
Highest energy capability
Excellent reliability
Consistent performance
Better 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 curve
Very low energy capability
Expensive.
Varistor IV Curve
Avalanche Diode IV Curve
FRANK
Transient Voltage
Suppressor
Diodes

7. Silicon Avalanche Surge Suppressor
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
FRANK

8. MODES OF PROTECTION - LINE CONNECTION
Neutral
Ground
FRANK
7 Modes of Protection
Avalanche Diodes will be added in a way to assist the reaction time of each Varistor (MOV)

9. Simplified Safe/Fail Circuit Diagram
MOV
MOV
MOV
Small Magnet Attached to MOV’s fail Indicator
Hall Effect Sensor
US1881
Output = High/Low
Frank
Micro Controller
Info. via Wireless Comm.
Info. Received at User PC

10. Implementation of the Hall Effect Circuit
Senor Attached
Here
Magnet will
be Attached
Here
Frank

11. 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
RICHARD

12. Areas of Research Wireless Transmission
Existing Wi-Fi network is required.
IEEE 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.
RICHARD

13. Areas of Research: Housing Redesign
Current
Proposed
WALE
Tools Available: SolidWorks is solid modeling
CAD (computer-aided design)
software.
3D Printing

14. UPGRADES TO THE SPD
FRANK

15. 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
MIKE

16. 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
FRANK

17. Tentative Timeline
FRANK

18. QUESTIONS? Visit our website http://smartsurgeprotector.wordpress.com/
Contact any of us
Cruz, Jaime
Dobbs, Michael
Guzman, Frank
Ogundere, Adebowale
Wallace, Richard