Advanced Coordination Topics – EasyPower w/ Power Protector

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Presentation transcript:

Advanced Coordination Topics – EasyPower w/ Power Protector David Castor, P.E. June 2015

Topics: MCCs and Panels – Creating TCCs Enhancing System Protection – Transformer Instantaneous Overcurrent and How to Set Phase vs Ground Overcurrent Ground Fault Protection and TCCs Coordination Between Phase and Ground Protection Arc-Flash Calculations and PowerProtector Interaction Copyright - 2015 - EasyPower, LLC

TCCs in MCCs and Panels Set the correct Load Type Any Load Type including “w/TCC” will plot a TCC when MCC is selected. Sub-fed MCCs and Panels must be modeled in the one-line FIRST, then added to schedule. Copyright - 2015- EasyPower, LLC

Enhancing System Protection In general instantaneous trip elements “in series” will not coordinate. However, if there is significant system impedance, the “reach” of the upstream instantaneous trip can be limited. Transformers represent substantial impedance, so primary instantaneous element can be used if set above maximum secondary fault current. EasyPower can help determine max fault current Copyright - 2015 - EasyPower, LLC

Phase and Ground Overcurrent By default, when TCC is created, a three-phase fault is assumed. Due to TCC “clipping” in PowerProtector, ground fault curves will not be seen. Change to SLG fault to see Ground fault protection. Transformer connections determine extent of ground fault (zero sequence) current in the system. Copyright - 2015 - EasyPower, LLC

Coordination Between Phase and Ground Ground fault devices do not see load current or balanced faults, but for a SLG fault, one phase overcurrent device will see the ground fault current. Need to consider coordination between upstream ground fault and downstream phase overcurrent device. Building to NEC minimum requirements for ground fault creates coordination issues. Copyright - 2015 - EasyPower, LLC

Arc-Flash and TCCs Arc-flash calcs can be displayed on TCC one-lines When settings are changed, arc-flash results are updated dynamically. Useful to investigate impact of settings changes on arc-flash. Look at how arcing current magnitude can be shown on the TCC. Copyright - 2015 - EasyPower, LLC