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© 2011 Eaton Corporation. All rights reserved. Eaton Air Circuit Breakers Arc Flash Reduction Maintenance System An overview of Eaton’s Arc Flash Reduction Maintenance System for Eaton ACB’s equipped with Digitrip Trip Units
2 2 © 2011 Eaton Corporation. All rights reserved. ARMS Technology TM Overview A rc Flash R eduction M aintenance S ystem ARMS is a separate integral analog circuit that when enabled in the Maintenance Mode, ARMS Technologies TM provides an accelerated instantaneous trip to reduce arc flash (system can trip as fast as 18ms!) The operator can pre-select from 5 levels of protection to facilitate the maximum arc flash reduction while avoiding nuisance tripping during planned start-up and maintenance operations without disturbing the normal operational trip unit settings Local and remote enabling and indication capabilities are provided as well as consideration for Lock-out/Tag-out procedures ARMS is available on Magnum Digitrip 520MC & 1150, as well as Series NRX Digitrip 520M and 1150
3 3 © 2011 Eaton Corporation. All rights reserved. ARMS features in white area of trip unit to separate it from normal trip unit settings Blue LED indicated in “Maintenance Mode” 2 Position Selector Switch: ON = Local ON O/I = OFF or External Control 5 Position Arc Flash Reduction Setting: From R5 (Max) …. To R1 (Min) Reduction Curves available on-line for each setting Remote Indication: Power Relay Module Maintenance Mode Contact Communications Remote Enable: Switchgear Mounted Logic Level Selector Switch Switchgear Mounted Logic Level Relay Remote Mounted Control Switch Via Communications: PowerNet, Modbus, Profibus Lock-out/Tag-out Digitrip 520MC ARMS Features
4 4 © 2011 Eaton Corporation. All rights reserved. Maintenance Mode Application Typical application: Magnum breaker equipped with ARMS feeding multiple Molded Case Circuit Breakers. If an MCCB needs to be serviced you can work on the breaker live or you can shut the power down via the Magnum, thus shutting down power to all circuits. With ARMS, you can activate the Maintenance Mode and service the MCCB live, without shutting down all circuits, and in the event there is a fault in the system the Magnum will trip faster reducing the amount of Arc Flash to provide maximum protection to the service personnel. This activation can be performed locally or remotely. Externally wired BLUE Lighting via a contact in the trip unit can offer visual indication that Maintenance Mode is enabled and should be reset once work is complete.
5 5 © 2011 Eaton Corporation. All rights reserved. Maintenance Mode Schematic Blue Light Mounted on Panel Communications: Indication & Activation
6 6 © 2011 Eaton Corporation. All rights reserved. Circuit Breaker Output = Arc Flash Energy Lab Output Terminals Cable Connection to Downstream Test Enclosure 18 AWG Shorting Wire between 3 Phase Electrodes Creates Arcing Fault 7 Calorimeter Array Simulates Body Torso Open Side of Enclosure 20 ”x 20” x 20” Downstream Test Enclosure With Open Front 3/4” Diameter Copper Electrodes Arc Flash Hazard Area Arc Flash Testing IEEE 1584 Test Setup for Power Circuit Breakers
7 7 © 2011 Eaton Corporation. All rights reserved. Beaver High Power Test Laboratory Example of Magnum DS breaker configured per IEEE 1584 Test Setup for Power Circuit Breakers Magnum DS Arc Flash Test Program
8 8 © 2011 Eaton Corporation. All rights reserved. As Described in NFPA 70E 2004 Category 2 PPE Category 4 PPE Personnel Protective Equipment (PPE)
9 9 © 2011 Eaton Corporation. All rights reserved. Magnum DS Standard & Narrow Frames Non-Current Limiting Construction 480 Vac Available Fault Current (kA) Incident Energy (cal/cm 2 ) IEEE 1584 Equations using T/C DataArc Flash Test Measured ValuesARMs Maint Mode Published Magnum Trip Unit Curves with Proper Instantaneous Trip Settings Category 1=4 cal/cm 2 Category 2 = 8 cal/cm 2 ARM S Maintenance Mode Accelerated Trip (Minimum Setting, Approximately 2X) Test Values for Magnum with Proper Trip Unit Instantaneous Settings (7.3) (48) IEEE Calculated Arcing Current (kA) (21) (35) Arc Flash Testing Confirms ARMS Accelerated Instantaneous Trip at the Maximum Protection Setting Can Reduce Incident Energy Up to 30%
10 © 2011 Eaton Corporation. All rights reserved. Time Current Curves for Magnum & Series NRX Digitrip’s with ARMS feature can be found at: Located under the ‘Trip Curves’ Tab ARMS Time Current Curves
11 © 2011 Eaton Corporation. All rights reserved.
12 © 2011 Eaton Corporation. All rights reserved. Competitor Solutions & Comparisons Schneider Electric – Alternate Maintenance Setting (AMS) Switch What is it? Simply put, this is a switch in the Zone Selective Signal to the breaker. In the Schneider solution the "AMS" switch is wired in series with the Zone Selective Input wiring to the breaker (Recall that Magnum & NRX offer ZSI as a standard option on all models of Digitrips). When the switch is "armed" it opens the Zone Selective Signal to the breaker from the downstream breaker. This puts the trip unit into a ‘quick trip’ mode if the fault is above the Short Time pick-up setting. The Digitrips analog circuit is much faster than Schneider's modified ZSI (40ms vs 80ms maximum clearing time). Timing is everything, the faster the trip the less arc energy and the less chance for harm to personnel. Eaton’s ARMS circuit will pick-up at 2.5X (peak sensing), this modified ZSI system from Schneider will only pick up at the Short Time Setting level. For example, if a Schneider TU short delay pick-up is set at 8X at 300ms and the fault was at a 7X level it would not even trip until Long Delay took it out. In addition Eaton has a contact output from the trip unit that is positive feedback that you are in the ARMS mode (contact that can be wired out to a blue stack light or other notification system) the Schneider solution does not offer this additional indication.
13 © 2011 Eaton Corporation. All rights reserved. Competitor Solutions & Comparisons Schneider – LD/SD CurveEATON – ARMS Curve 80ms v. 40ms
14 © 2011 Eaton Corporation. All rights reserved. Competitor Solutions & Comparisons Siemens Electric – Dynamic Arc Flash Reduction System (DAS) What is it?
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