Specifications subject to change without notice. Copyright © 2011 MISTRAS Group, Inc. All Rights Reserved. www.mistrasgroup.com

Products & SystemsDivision

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Solution Data Sheet

SF6 breakers are critical to reliable opera-tion of utility grids and, with increasing fleet age, are a target of continuous improve-ment of maintenance practices. The break-ers’ importance, coupled with a growing fo-cus on environmental stewardship, has led many utilities to investigate better ways to monitor SF6 breakers and minimize main-tenance costs associated with SF6 leaks.

MISTRAS has developed a wireless SF6 Moni-toring System to address the need for accu-rate low cost predictive monitoring and not traditional stand alone alarm monitoring. The system combines the latest advances in sen-sor, processor, wireless mesh networking & energy harvesting technology and packaging, combined with patented algorithms that ac-curately track gas loss and allows for proac-tive rather than costly reactive maintenance.

The system was specifically designed in com-bination with a leading electric utility to eas-ily install and operate in rugged, high voltage environments. Installation does not require an outage or special training. The system is scal-able where new sensor nodes can be added and configured in minutes. Once operational

the system compensates for ambient tempera-ture effects, removing the diurnal swings that make current density monitors problematic.

Information from the system is made available to users via a secured intranet web browser or can be interfaced to the utilities SCADA system. The system also interfaces to the OSIsoft PI Sys-tem for custom visualization and data transfer to the utilities maintenance management system.

SYSTEM ECONOMICSReactive maintenance can greatly exacerbate the impact to maintenance budgets. This is due to leaking breakers typically alarming on low levels of gas during non-working hours because low ambient nighttime temperatures correlate with low uncompensated pressure readings and increased leakage. This causes the unscheduled dispatch of personnel to “roll the truck” or dispatch a crew in an af-terhours overtime call to remote substations.

Addressing both reduced overtime expen-ditures and greater environmental sustain-ability can be aided by a solid predictive SF6 maintenance program. Such a program must appropriately monitor SF6 pressures, ac-

SF6 Leak Detection Solution

See the problem before it’s a problem!

curately compensate for temperature, and highlight leak trends to provide the predictive scheduling of maintenance activities. These advanced features are what the MISTRAS SF6 monitoring system incorporates and provides.

FOR MORE INFORMATION:Please call 1-609-716-4000 or visit us on the web at www.mistrasgroup.com.

SF6 Module

Optional Solar Harvester

Specifications subject to change without notice. Copyright © 2011 MISTRAS Group, Inc. All Rights Reserved. www.mistrasgroup.com

WORLDWIDE HEADQUARTERS:195 Clarksville Rd • Princeton Jct, NJ 08550 • USAT: +1.609.716.4000 • F: +1.609.716.0706E-MAIL: sales.systems@mistrasgroup.com

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#210A-10110-01

Specifications:Process:�������������������������������������������������������������������������������Any pressurized SF6 insulated electrical device�����

EnclosureProtection level: ................................................................................................................. NEMA 4X, IP 66Approximate dimensions: .................................................................................................... 3” Dia X 4.5” L

EnvironmentalAmbient temperature range: ..........................................................................-40 degree C to 75 degree C

Power SupplyLithium Battery: ...................................................................................4 year battery life under typical use Rechargeable Lead-Acid Battery: ....................................... Solar Powered, 3 months lifetime in absence of sunOptional AC: .............................................................................................................................110/220 volt

Communication to Control House GatewayWireless: ........................................................................... 900 MHz North America/2.4 GHz also available IndicatorVisible Alarm: ......................................................................................................................................... LED

Information DisplayGraphical w Alerts: ............................................................. Interface to utility substation display softwareOptional: .................................................................................... MISTRAS RMA website-utility only access

Temperature SensorsInput Range: ............................................................................................................................. -40 to +125CResolution: .......................................................................................................................................... 16 bit

Pressure SensorInput Range: .......................................................... 0 to 100psi (higher pressure custom versions possible)Resolution: .......................................................................................................................................... 16 bit

SF6 Leak Detection Solution