Transcript Sensor Guard Technical Presentation TelCel Jan2007

Pre-emptive Power
and Lightning Protection
Ever More Sophisticated Equipment
Deployed Drives Greater Power Protection Needs
• Tower and site standards
• Grounding program
• Equipment protection improvements
Traditional Grounding and Surge Protection
Devices (SPDs) alone do not fully protect
service integrity
BlitzGuard
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BlitzGuard is the final line of defense for electrical
systems vulnerable to lightning induced surges and
protracted AC Supply fluctuations
BlitzGuard isolates vulnerable systems from the
threats of:
- Grid supply fluctuations
- Ground Potential Rise (GPR)
- Direct or near Lightning Strike
Why Pre-emptive Protection?
Unstable AC Grid Supply Voltage is a Common
Problem Worldwide
• Exposing the AC Power components to high or
low voltage affects site reliability
• Protect through isolation of selected site
equipment
Why Pre-emptive Protection?
The most effective protection for sensitive
electronic systems during lightning events is
disconnection
• Surge Protection Device’s (SPDs) allow some surge
voltage/energy to pass through: known as “let through”
• Repeated exercise of an SPD often leads to failure
• SPDs are designed to cope with specific surge events
The results of a near lightning strike
The effects of lightning on electronics
• Can either come through the AC grid or from the site
ground to grid following an AC line or local ground strike
• Results in some level of GPR
• These multi-frequency electrical surges burn up electrical
equipment and their power supply circuitry
• Microprocessor circuitry can be damaged by a nearby
strike even if they are not in use
Even the best of
grounding systems
can fail to provide
the intended and
expected protection
Why Pre-emptive Protection?
• Isolation before the event is the only effective protection
against Ground Potential Rise (GPR)
• The combination of suitable SPDs and Pre-emptive
Isolation provides the best possible level of protection
What does Pre-emptive Isolation deliver?
• Reduced capital costs through virtual elimination of site
equipment failure due to power issues
• Reduced service down time
• Reduced operational costs through fewer site visits; 50%
reduction typical due to
– Fewer equipment replacements
– Fewer breaker trips requiring unnecessary site visit
BlitzGuard
SG01 : Single Phase
SG02 : Two Phase
SG03 : Three Phase
All models:
120V or 230V per Phase
Microwave & Cellular Installation
in South Africa
• BlitzGuard deployed in
front of rectifiers
• Protects Power shelf and
site electronics
• Lightning Sensor
mounted on site building
to detect threatening
lightning activity
BlitzGuard Installation
AC Supply
To facility
Lighting
Rings
&
other non critical
areas
Meter
&
Breakers/
Fuses
SensorGuard
BlitzGuard
SPD’s
U
P
S
Isolates AC
Supply
Building Ground
Connections
IT: Servers, PC’s, LAN
PABX, Phones, Alarm System
Voltage Gradient Between Remote Locations
10KV
10KV
20KV
30KV
40KV
Current Flow
40KV
Cell Site Power and Protection Scheme (1)
Tower Strike with Conventional Protection
Comment: Connections to the site grounding system are the lowest
impedance path to ground for lightning fault currents. The fault will
divide and flow through all available paths to the point of greatest
potential difference. GPR at the tower base will find paths into the
equipment as it seeks the lowest impedance path to ground. Also, the
SPD may fire backwards under these conditions.
Battery
Co-Axial
Protector
Base
Transceiver
-
Phase
Φ
+
DC Power
Supply
N
AC Supply
Neutral
AC Surge
Protector
(SPD)
GPR
Tower
Ground
Building &
Equipment
Ground
AC Service
Ground
Power
System
Grounds
Cell Site Power and Protection Scheme (2)
Tower Strike with BlitzGuard
Comment: By opening the path between the site electronics and the
AC power system ground (the greatest potential difference from the
fault), fault currents equalize over the remaining available paths.
Battery
Co-Axial
Protector
BlitzGuard
Base
Transceiver
-
Phase
Φ
+
DC Power
Supply
N
AC Supply
Neutral
AC Surge
Protector
(SPD)
GPR
Tower
Ground
Building &
Equipment
Ground
AC Service
Ground
Power
System
Grounds
Applications of BlitzGuard
Industry Applications include:
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Telecoms, both fixed line and wireless
Radio Communications (emergency services)
Energy pipeline infrastructure
Transportation Signalling
Media: TV and Radio Transmission sites
General IT and Equipment protection
Telecoms Fixed Line & Wireless
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Protects Cellular systems against GPR
Complements Site Grounding and SPD
For DLC cabinets, mitigates against substandard grounding
Virtually eliminates rectifier/Power shelf damage
Substantially reduces line card failure
Reduces unnecessary site breaker trips
Telecoms Fixed Line & Wireless
Radio and Media Sites
• Suitable for Television and Radio transmission sites
• Protects site equipment from GPR when site struck by
Lightning
• Used to protect radio communication sites where mast
exposed to lighting strike
- e.g. Emergency services radio systems
Radio and Media Sites
Pipeline Infrastructure
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AC Service
Rectifiers
Control Electronics
Pipeline Skin DC output terminal
Anode Bed DC output terminal
All these have connections to
Grounded, metallic elements –
pipeline, anode bed, and local AC Service ground
Transportation Signalling
• Signalling and communication systems on Rail systems
exposed to Lighting surges
• Motorway/Highway signalling infrastructure exposed by
multiple dispersed grounds
• Sophisticated monitoring and communications exposed
Many Thanks
Questions?
CONTACT US:
EGC International Corp.
6788 N.W. 17 Ave. Fort Lauderdale FL. USA 33309
Tel: (954)979-5510 Fax: (954)979-5515