Netw ork Equipment Monitoring Programs January 30, 2018 Bradley - - PowerPoint PPT Presentation

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Netw ork Equipment Monitoring Programs January 30, 2018 Bradley - - PowerPoint PPT Presentation

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Netw ork Equipment Monitoring Programs January 30, 2018 Bradley Kittrell Distribution Engineering Agenda Con Edison Time-Based Remote Q&A System Overview Inspections Monitoring 5 Minutes 10 Minutes 10 Minutes 10

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SLIDE 1

Netw ork Equipment Monitoring Programs

January 30, 2018 Bradley Kittrell Distribution Engineering

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SLIDE 2

2

Agenda

Con Edison System Overview

  • 5 Minutes

Time-Based Inspections

  • 10 Minutes

Remote Monitoring

  • 10 Minutes

Q&A

  • 10 Minutes
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SLIDE 3

Con Edison Snapshot

  • 28,000 network transformers

– 500, 1000, 2500 kVA – Vault and subway (end-mount or

side-mount) styles

– Mineral oil and natural ester

  • Physical installation

– Primarily below sidewalks/streets – Some within buildings

  • Predominantly N-2 network

design

3 Overview Time-Based Remote Q&A

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SLIDE 4

Time-Based Inspections

  • Balance between company resources and risk
  • Inspection categories vary due to…

– Secondary voltages (120/208V or 277/480V) – N-1 design locations – Locations deemed as essential services (hospitals, government

buildings, generation, etc.)

– Installation of sensor technology

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Population Inspection Frequency 20,000 Transformers 8 years 8,000 Transformers 1-6 years (depending upon category)

Overview Time-Based Remote Q&A

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SLIDE 5

Time-Based Inspections

  • Information collected

– Transformer pressure – Top-oil temperature – Dielectric fluid level – Corrosion severity (tank & cover, cooling panels, secondary throat) – Approximate percentage of anodes remaining – Ability of the network protector to operate properly – Dielectric fluid sampling

  • Strength, moisture, acidity, color, presence of contaminants
  • Dissolved gas-in-oil
  • Information is electronically logged

5 Overview Time-Based Remote Q&A

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SLIDE 6

Remote Monitoring System Overview

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Substation Pick-Up Coil Breaker Receiver Transformer Secondary Network Transmitter Network Protector VDAMS NetRMS HUD PVL

Overview Time-Based Remote Q&A

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SLIDE 7

7

Pressure, Temperature, and Oil Sensors (P.T.O.)

  • Temperature Sensor
  • Pressure Sensor
  • Oil Sensor

Overview Time-Based Remote Q&A

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SLIDE 8

Other monitoring

  • Load in %
  • Voltage
  • Network Protector Status (open/close)
  • Low oil level flag
  • Back-feed condition flag
  • Oil minder status flag
  • High water flag
  • High temperature flag

8 Overview Time-Based Remote Q&A

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SLIDE 9

Questions?

Overview Time-Based Remote Q&A