texasheart.org

Main Substation (MSS1) 13,800 volts

Analogies:

Chest Pain = CoronaMinor Stroke = TrackingCardiac Arrest = Arcing (may not be able to resuscitate electrical system)

Building transformers 480 volts

Circulatory System

Our electrical infrastructure

Rust

Bird caging

Heat damage

Damaged insulation

~50 yr. oldconductor

All pictures of actual conditions: July 2014

Items performed to date (no outage)

• Installed temporary power quality monitors– Main substation and key building substations

• Ultrasound testing– All substations

• Discovered arcing, tracking and corona

• Identified arcing in Basic Science Building & Med School– Replaced breakers

• Started Electrical Coordination Study• Transformer Oil Sample Testing• Removed LIB (temp. HVAC load) and ALTC (temp. load)• Refurbished main and building substation breakers

Short Term (outage-6hr mid Sept)

• Open MSS1 and insulate wiring

• Hi pot MSS1

• Replace oil in transformers

Recommendations ( Jan outage)

• Replace MSS1– Main 13,800 volt substation is at its end-of-life.– MSS1 is the heart of the electrical system. It serves as a 13,800

volt “pump” for the entire Long Campus.– MSS1 was purchased, as a used item, from CPS Board (today

known as CPS Energy) ~50 years ago.

• Replace oldest conductors– MED lines are the oldest.

• Rework all building substations transfer switches, breakers, bus bars.

• Perform another ultrasound test after outage is complete to compare against prior ultrasound test performed before the outage.