Consolidated Edison Stray Voltage Program


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Consolidated Edison Stray Voltage Program
Stuart Hanebuth Consolidated Edison Co. of NY, Inc.
1
ON IT

Con Edison Service Territory

Con Edison Company of NY
ƒ NYC and Westchester ƒ Area: 660 sq. mi. (Elec &
Gas)
ƒ Population: 9.1million

ƒ3.1 million electric
customers
ƒ13,141 MW 2006
Peak
ƒIn some areas,
Load Density up to 2000 MW per Sq Mile
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ON IT

Stray Voltage Mitigation Strategy
• Testing • Inspection • Systems approach to safety • Research and Development Initiatives • Stakeholder Communications • Future Challenges
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ON IT

Big Picture

Energized Equipment (ENE)

5600 5200 4800 4400 4000 3600 3200

5427 5534 5400

280

526

260

240

220

2863

3226

200

3143

18 0 2 9 10
16 0

2800 2400 2000 16 0 0 12 0 0
800 400

2099 966
113 3

2278 118 3
10 9 5

17 5 3 13 9 0

2201

2671

19 6 4

14 0
4874 12 0
10 0 80 60 40 20

0

0

Frequency 200 0 4 of scans in

2005 5,266

mileage

Con Edison

2006 12,834

2007 22,592

2008 57,208

2009 43,026

N o n- C o n Ed iso n Pr o ject ed

Electric Shock Reports (ESR)
285

75 230

188 114

99

133

2 10 2004

116 2005

89 2006

87
46 2007

94
81
13 2008

90 21
48
69
21 2009

C o n Ed iso n N o n- C o n Ed iso n Pro ject ed

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ON IT

Manual Testing Program • 2009 Manual Testing
– 183,000 underground structures – 285,000 overhead poles – 130,000 streetlights
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ON IT

Mobile Stray Voltage Testing Program
• Annual goal is to complete 12
scans of our underground system goal between April 1, 2009 – March 31, 2010
• Eliminated the need to manually
test 144,000 objects
• Testing is conducted 5 nights
per week
• 14 vehicles per night
6
ON IT

Results of mobile testing

• Mobile Program tests
entire landscape rather than discrete objects
• More than 45% of
detections are on items that would not be tested during manual testing

Stray Voltage Location
Traffic Lights Street Lights Sidewalk Fence Customer Equipment Gate Con Edison Manhole Non-Con Edison Manhole Fire Hydrant Gas Cap Street Signs Scaffolding Metal Door

Percentage of total
detections (2009) 26.63% 19.28% 16.80% 8.52% 6.40% 3.65% 3.50% 3.02% 1.91% 1.73% 1.46% 1.40% 1.34% 7
ON IT

Facility Inspection Program
• Currently in final year of five year inspection cycle
– 282,000 Overhead structures – 286,000 Underground structures
• Preventative program • Requires detailed visual examination of facilities and its
equipment.
• Test for stray voltage conducted at the beginning and end of
each inspection.
• Deficiencies identified during inspections are prioritized for
repair in four levels.
8
ON IT

Systems Approach to Safety

• Cable replacement program
• Composite cover program
• Streetlight Isolation Transformer
Installations
• Vented manhole and service box
cover programs
• Transformer reliability programs
• Periodic System Safety Meetings

9
ON IT

Research and Development
• EPRI personal arc fault detector
– Portable device – Intended for crews to use in manholes while performing work – Possible mobile application
• Texas A&M network arc fault monitor
– Online system – Data collection and analysis ongoing
• Advanced Stray Voltage Detection initiative
10
ON IT

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Consolidated Edison Stray Voltage Program