2/11/2016 PSE&G NMS 1

Network Monitoring SystemDavid Blew - PSE&G

January 8, 2019

IEEE Transformer Committee PC57.167 WG

Topics

• Fiber Loop

• Vault Equipment

• Installation/Maint/Repair

• Available data

• Benefits and analysis

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System Capability

• Provides real time monitoring of network vaults

• Fiber optic backbone with complete fiber redundancy

• 2-way system allows control of NWPs

• Very advanced system capabilities

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Network Monitoring Systems

• Paterson (80 NWPs)

• South Waterfront (127)

• Newark (119)

• Newark Airport (63)

• New Brunswick (69)

• Trenton (147)

TOTAL (605)

Network Transf & NWP

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Older Network Transformer

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Basic Components

• NWP communicating relay• Transformer sensors• Vault sensors• Cable fault indicators• Communication infrastructure

– Submersible box in vault with SEL-2411 and RS-400– Fiber backbone from vaults to substation– Fiber rack (at substation)– Frame relay (from station back to division SCADA

master)

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Vault Overview

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FaultDetectors

Communicating NWP Relay

New Version 9◼ Communicating/SCADA board

◼ Additional memory/buffers

Optical port

RS435 port

Looks identical to prior version except part#

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J Box

DSB: Apr 2010 AM&CS UG 10

NWPJunction Box

Transformer Sensors (PTO)

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Oil Level

Oil Temp

N2

Pressure

Submersible RTU Box (up to three xfmrs)Generation 1

Contains:◼ RS400

◼ SEL-2411

◼ Power supply

◼ Terminal blocks or connectors

◼ Waterproof fittings

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Submersible RTU Box (up to 4 xfmrs)Generation 2

DSB: Apr 2010 AM&CS UG 13

Cable Bundle

DSB: Apr 2010 AM&CS UG 14

Fiber Splice

DSB: Apr 2010 AM&CS UG 15

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PILC Cable Fault Detector

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New technology by SEL

PSE&G first utility to implement

In service for several years w/ good results

20 minute reset (to conserve batt)

EPR Cable Fault Detector

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Auto reset by current of 3 amps or more

EPR FCI on Cable

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Must be installed over either NOneutral or DOUBLED neutral

NWP Relay Points Available

• Breaker Status

• Voltage (Network)

• Differential Voltage (vector VN - VT)

• Current magnitude and angle

• 3Ø kW

• 3Ø kVAR

• 3Ø kVA

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NWP Relay Points Available (con’t)

• Diff volts too low

• Wrong phase angle (phasing angle)

• Network volts too low to close

• Calling for TRIP

• Calling for CLOSE

• Float

• Cycles (operations)

• Case internal temp, pressure, and float (1”)

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Transformer/Vault Points Available

• Transformer PTO

– Tank Nitrogen Blanket Pressure

– Oil Temperature

– Oil Level

• Ambient Temp

• Float sensor (at about 1 foot above floor)

• Fire Detection (over each transformer)

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NWP Remote Control Available

• TRIP

• Relaxed CLOSE

– Enable, Disable, Active

• Block CLOSE

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Communicating with NWP relay to issue a Close or Trip command.

No guarantee that mechanism will operate.

Data Available via:

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SCADA CMMS

UG Sharepoint

FieldPro

SCADA

• Operations

• Regular SCADA system

• Real time (within seconds)

• Control of NWP

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CMMS

• Anyone within PS firewall

– Local or VPN

• PI database of SCADA data

• Almost real time (within 30 seconds)

• Historical data and analysis

• No control of NWP

• ProcessBook displays

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UG Sharepoint Site

• Anyone within PS firewall

– Local or VPN

• Same data as CMMS

– PI database of SCADA data

– Almost real time (within 30 to 45 seconds)

– No control of NWP

• Coresight software

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FieldPro

• Software by relay manufacturer

• Must be on fiber system to connect to NWP relay

• All relay data is available including event capture buffers

• Can upload new firmware and/or relay settings

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NMS Benefits

• Real time operating data during network trouble or emergency

• Control of NWPs

• Identification of backfeeding NWPs

• Eliminate visits to vaults prior to de-energizing circuit (“day priors”), on large network this can take 2 crews an entire day

• Identify worst performing assets on networks

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From this… to this !!

Success Stories

• Fault locating times significantly reduced

• Info avail during several network emergencies

• Identified several NWPs not operating properly– Failed to operate alarms

– Excessive OPS in short period

– No OPS in one year

• Load transfer of ten 26kV feeders at switching station from one group bus to another

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Downside

• Expensive (~ $5 mill per network)

• System is complex (lots of parts and pieces)

• Several depts are involved in troubleshooting

• Dispatchers are new to network operations

• Takes time for field crew “buy in”– If NMS system not working, network is still fine

– Once they have an event where the system helps them during emergency, they get it

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Moving FROM Human TO Computer monitoring

• Display screens require human interaction

• Built algorithms for computer to analyze data

– notify key people when needed

• Text messages and emails from system

– Critical alarms (immediate attention)

– Excessive operations (look at soon)

– Voltage imbalances (investigate further)

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CBM Algorithms

• Building Condition Based Maintenance (CBM) logic for:

– Network Transformers

– NWPs

– Cable

– System self health monitoring (including fiber and RTUs)

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Ongoing Analysis

• Will take some time to tweak screens and develop correct algorithms (learning curve was several years for substations)

• UG Asset Management CBM

• Identifying new ways to use data

– Operations

– Maintenance

– Equipment replacement

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Questions??

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