ANSI/TIA-1194 Surge Resistibility of Smart Grid Equipment Connected - - PowerPoint PPT Presentation

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

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A Possible Home Network

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So What Is The Problem??

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Ground Potential Rise (GPR)

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Equipment with 2 Ground Reference Points

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• The equipment is referenced on the signal side to point A
• The equipment is referenced on the AC side to point B

• 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

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Equipment with 2 Ground Reference Points

Equipment with 2 Ground Reference Points

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• 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

Signal Lines Grounded at Remote Site – Ground Potential Rise (GPR)

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• Examples of equipment with services having

separate grounds:

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• 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

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Smart Grid Meters/Meter Accessories

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• 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

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Smart Grid PV System

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• 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

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Smart Grid Network Equipment

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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

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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

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Questions ?