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April 10th 2019
Remote Monitoring System Improvements
Robert Spelman, PE
Supervisor, UG Distribution Standards
1
Pepco Holdings Quick Facts
2
• Incorporated in 1896
• 640 Square Mile Service Territory
• 2.3 Million Population Served
• 134 Substations
• 9 Facilities
• Washington DC Headquarters (PHI / Exelon)
Utilities With Network Systems
Pepco
Atlantic City Electric
• Incorporated in 1924
• 2,700 Square Mile Service Territory
• 1.1 Million Population Served
• 90 Substations
• 8 Facilities
Network System Overviews
• Pepco 13kV Network
• ACE 23kV Network
• Pepco 13kV Network Remote Monitoring System
Section 1
4
Pepco 13kV Network System• 51 Network Groups
– ~300 13kV Feeders
– 21 Substations with Network Feeders
– ~4,600 Network Protectors
– Average 6 Feeders/Group
– Mix of LVAC and Spot Networks
− 480Y/277 – 53%
− 216Y/125 – 47%
• N-1 System Design
• ~1,400 MVA Peak Load
• Approx. 70,000 Customers
– Residential → Large Commercial/Government
• Sidewalk / Street / Some Rooftops
• Substation Ring Bus, Closed Ties
5
ACE 23kV Network System
• 1 Network Group
– 5, 23kV Feeders
– 48 Network Protectors
– All units 216Y/125
• N-1 System Design
• ~10 MVA Network Load
• Approx. 1,300 Customers
• Sidewalk / Street / Boardwalk Locations
• System Not Expanding, Slowly Shrinking
– Small Customers Can Still Be Connected to
Grid
• Large Customers Served From HV Feeders
(12kV/23kV)
6
• Checking Protector Status
• Locate “Hung In” Protectors Much Faster
• Ensuring Opposite Protectors are Closed at Critical Facilities
Before Granting Outages
• Remote Operation
• ROBO – Remotely Block Open a Protector
• Load Information – Monitor Overloads – Intelligently Plan
System Loading
• Check and Update Protector Settings Remotely
• Identify Failed Protector or Blown Fuses via Alarm
• Phasing Remotely Following Cable Work
• Respond Quickly and Intelligently to System Emergencies
• Currently Installed on ~11% of Network Transformers
Benefits
• ~500 locations with RMS in service and communicating
• Eaton Vaultgard
• Developing dashboard for real time display of key data points
• Determine “best value” monitoring. Cost/benefit analysis
Current Status
Pepco Network Remote Monitoring System (RMS)
7
Remote Monitoring System (RMS)Simplified System Schematic
Monitoring Inputs
• Relay Data
• Ambient Temp
• Water Level 1
• Water Level 2
• Main Tank Oil Temp
• Main Tank Oil Level
• Primary Cabinet Oil Level
• Primary Cabinet Oil Level (if 2 compartment)
1-8
Network Transformer
Network Protector
Primary
Switch
4
3
2
1
7
5 6
8
RelayBulk
head
IP 68 Enclosure
Silver Spring
E-BridgeVaultGard
Digital and Analog
Inputs
Antenna
Inputs
1-8
Operations Control CenterFiber
Substation
Other
Protectors
8
RMS PI DisplaysTrending Data Analytics
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RMS DisplaysReal Time Monitoring - OCC
10
Alarms and MonitorsDevelopment
Remote Monitoring System Improvement Project
Section 2
12
Example - 3 Transformer Spot Network
Cable Bus
13
Example - 3 Transformer Spot NetworkCurrent Set Up
Cable Bus
V
G
U
P
S
4321
7
5
6
8ANT.
4321
7
5
6
8
4321
7
5
6
8
Monitoring Inputs
• Relay Data
• Ambient Temp
• Water Level 1
• Water Level 2
• Main Tank Oil Temp
• Main Tank Oil Level
• Primary Cabinet Oil Level
• Primary Cabinet Oil Level (if 2 compartment)
1-8
VG
U
P
S
Collection of 8 “Monitor” Cables From Each Vault
VaultGard Enclosure
SSN Radio
Qualitrol DIM
UPS Enclosure
Battery Backup
ANT. Radio Antenna (SSN)
14
BackgroundRoom For Improvement
Labor / Modularity
Cable
Connections
Material
Gauge
Calibration
Input
ConfigurationGauge Quality
Water Ingress
Subject Matter Experts
Development and Iteration
15
Gauges and Sensors
• Corrosion
• Water Ingress
• Sub Par Quality
• Non-Corrosive Housing
• IP68 3rd Party Certified
• Plug and Play
• No Need to Label
• No Calibration Required
16
Water Ingress
• Minimizing
Openings
• Minimal Wiring
• IP68 Connections
• One Enclosure
17
Ease of Installation
• Dedicated Conduit(s)
Usually Required
• Remove and Re-Attach
Cable Connections
• Careful Gauge Labeling
Required
• Current Process Is Labor
Intensive $$$$
• Many Connections and
Individual Cables to Pull
• Every Cable Kept Track of from
XFMR to Enclosure
• Error Prone Steps
18
• No Calibration Required
• Plug and Play with New Gauges
• Magnetic or Bolted Mounting Options
• Accepts 12 Inputs – Fully Configurable
• More Distance Between Transformers
• All Gauges and Relay Wiring to Connect Locally to TRTL
• 1 Armored Ethernet Output Per Transformer Vault
– Greatly Reduce Main Enclosure Penetration
– Greatly Reduce Wire Pulling Labor and Connections
• Potted, Non-Corrosive, IP68 Certified
TRTL ConceptFuture Improvement?
19
Example - 3 Transformer Spot Network – (End Goal)With TRTL Implementation
Cable Bus
4321
7
5
6
8
4321
7
5
6
8
4321
7
5
6
8V
GANT.
VG
TRTL Box
Armored DNP Ethernet (1 Per XFMR)
VaultGard Enclosure
SSN Radio
NP Serve
Battery Backup
HMI
ANT. Radio Antenna (SSN)
Monitoring Inputs
• Relay Data
• Ambient Temp
• Water Level 1
• Water Level 2
• Main Tank Oil Temp
• Main Tank Oil Level
• Primary Cabinet Oil Level
• Primary Cabinet Oil Level (if 2 compartment)
1-8
20
RMS Installation – (End Goal)Mock Vault
