Distribution And Incidents Flashcards
Con ed electric customers
~3.5 million
How many customers network/non-network
~2.6 million network
~900,000 non-network
Electric service territory
~604 square miles
Con ed #area substations
62 area substations
What does second contingency mean?
.
Voltage levels
Westchester: 13kV, 4kV Bronx: 13kV, 27kV (Co-Op City), 4kV Queens: 27kV, 4kV Brooklyn: 27kV, 4kV Manhattan: 13kV Staten island: 33kV, 13kV, 4kV
the individual voltage levels are a result of the design choices by the companies that were consolidated to form Con Edison
Manhattan # area substations, networks, daily peak network load, customers
28 area substations (but 2 in bronx) 39 second contingency networks Network peak load summer: ~21MW-275MW ~750,000 customers Peak hours ~8am-4pm (other boroughs have higher in evening)
Two main distribution design Systems
Network ( 80% of the load )
Radial: Auto loop, 4kv unit substation grid, underground residential distribution Systems
Describe a network distribution system
Designed for a second contingency in the city and first contingency in Westchester / Staten Island
Primary feeder -> network transformer/network protector -> secondary 120/208 V grid tied together
Describe Auto loop distribution system
Designed for single contingency, mostly in Staten Island / Westchester
27 kv, 13 kv, 4kv
Either three or five recloser designs
provides enhanced reliability to supply feeders or separated by normally open tie recloser. If one read feeder fails, the fault is isolated by the normally closed feeder / midpoint reclosers and the tie recloser closes to feed from the other supply feeder
Jodie Lane fatality
In 2004, Jody Lane, was walking her two dogs on East 11th Street and made contact with an electrified service box and was electrocuted and died. The cause was a 120 volt shunt cable which was not properly insulated. over the next two months, Con Edison tested all of its electric system underground structures for stray voltage, and also committed over 9 million dollars to fund stray voltage detection programs.
Ukraine Cyber attack
In 2015, the first successful Cyber attack against a utility was coordinated against three utilities in ukraine. They took control of the utility scada Systems and removed critical substations from service, causing an outage for over 200,000 people for several hours. This attack began with fishing
Plymouth Street breaker
In 2017, to $138kv feeders at Plymouth Street substation opened automatically. Hall Network into Ace contingency and interrupted service to many customers including MTA lines.
The fault originated on a feeder and a manhole near the Plymouth Street area substation, but a breaker in the substation was slow to open which led to unnecessary isolation and equipment damage. No injuries but potential for injury if anyone had been near the slow breaker, which was physically ejected from its cubicle.
Con Edison reviewed all similar breakers and ultimately corrected over 100 breakers that were also out of specification. Renewed focus on rigorous procedural adherence
Puerto Rico mutual assistance
In 2017, hurricane Maria cause catastrophic damage to Puerto Rico’s electric infrastructure, resulting in the loss of over 1.5 million customers. Con Edison was the first utility to respond to Puerto Rico that was not working for the army corps of engineers. No ConEd injuries and the New York State contingent (led by Con Edison in New York power authority) was responsible for over 24% of the Puerto Rico restoration
Super storm Sandy
in 2012, superstorm Sandy was the most damaging storm event in company history, left more than 1 million content customers without power.after super storm Sandy Con Edison continued its enhanced focus on storm hardening and flood protection, including making sure that new transformers and network protectors at or below sidewalk level must be submersible or installed above flood level
in 2013 Con Edison submitted a rate proposal with 1 billion dollars in investments to protect customers from devastating storms
