ANSI/TIA-1194 Surge Resistibility of Smart Grid Equipment Connected to either DC or 120/240 V Single Phase AC and Metallic Communication Lines Randy Ivans UL LLC Chairman TR41.7 November 15, 2013
Why is it important for the H2G DEWG to offer TIA-1194 as a candidate for the SGIP Catalog of Standards? • The H2G DEWG focuses on elements of a smart grid that extend beyond the meter into homes • These elements include equipment that is exposed to electrical transients and surges • These surges can (and do) cause equipment failures • This is true even if the equipment is not metallically connected to outside communications lines • TIA-1194 contains test procedures and resistibility requirements to ensure communications ports continue to demonstrate basic functionality 2
A Possible Home Network 3
So What Is The Problem?? 4
Ground Potential Rise (GPR) 5
Equipment with 2 Ground Reference Points • The equipment is referenced on the signal side to point A • The equipment is referenced on the AC side to point B 6
Equipment with 2 Ground Reference Points • During a transient event, a potential difference can exist between the ground conductors of different parts of the same building • As the potential difference equalizes throughout the ground system, it creates a transient surge on the LAN cables • The result is damaged network cards, blown ports on a hub, and other problems 7
Equipment with 2 Ground Reference Points • A lightning strike can develop a large potential difference between point A and point B • With a 3000 A surge and a 9 meter (~30 foot) long ground connection between A and B, the voltage developed in wire A – B can be ~10,000 V 8
Signal Lines Grounded at Remote Site – Ground Potential Rise (GPR) 9
• Examples of equipment with services having separate grounds: 10
• Examples of equipment with services having separate grounds: – smart grid power meter that is connected to the AC power at one side of a building and a communications service at the opposite side 11
Smart Grid Meters/Meter Accessories 12
• Examples of equipment with services having separate grounds: – smart grid power meter that is connected to the AC power at one side of a building and a communications service at the opposite side – photovoltaic system with a communications link to the smart grid 13
Smart Grid PV System 14
• Examples of equipment with services having separate grounds: – smart grid power meter that is connected to the AC power at one side of a building and a communications service at the opposite side – photovoltaic system with a communications link to the smart grid – networking equipment with power and multiple communications ports 15
Smart Grid Network Equipment 16
ANSI/TIA-1194 It doesn’t matter how “Smart” a system is. If it is susceptible to failures resulting from routine transient and surge events – it won’t reliably perform its intended function – it can be an inconvenience for both the utility and the consumer – it degrades consumer confidence in the smart grid system 17
ANSI/TIA-1194 • Premises equipment that is connected to: – one or more metallic conductive communication line(s) – a DC power source, or a 120/240 V single phase AC power service with the neutral grounded at the service entrance • Test procedures • Resistibility requirements • Communications ports shall continue to demonstrate basic functionality when subjected to surges 18
Questions ? 19
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