Intelligent Line Monitoring and Disturbance Management Ryan Kelso/Justin Stroupe July 24, 2018

New Braunfels Utilities Overview

¾41,373 Electric Meters ¾99.5% AMI (Itron Network Solutions) ¾160 sq. mi. Electric Territory ¾619 miles Primary OH ¾285 miles Primary UG ¾40 Distribution Feeders ¾20 miles of 138kV transmission ¾24/7 Control Center Operations

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The Desire

¾Enhance visibility of the distribution system ¾Improve system resiliency ¾Reduce outage duration - SAIDI ¾Lower outage frequency - SAIFI

¾Leverage existing AMI communications network to connect grid-edge devices

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Existing Tools

¾Fault Indicators (flashing lights) ¾Milsoft Outage Management System ¾Itron Network Solutions AMI ¾Intelligent substation relays

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The Solution: Sentient

$100+ million invested in developing and delivering

sensing technology

Proven technology ≈ 60,000 intelligent sensors shipped. Serving 8 of top 10 largest utilities in North America

Highest fidelity oscillography on the

market (>7,800 samples/second)

Multiple communications options

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MM3: Sentient Core Sensing Solution Overhead Feeder Monitoring System

¾ Continuously sampling, 130 Sample/cycle Current and E-field capture

¾ GPS for location and precision timing

¾ MM3 supports multiple communications options: Itron, L+G, and LTE technology

¾ Patented power harvesting technology requires no servicing or maintenance for the life of the product

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MM3 Intelligent Sensor

¾ Easy installation ¾ Local annunciation:

daylight-visible LED ¾ Embedded fault detection

algorithms: ¾Fixed Trip, Auto-range, Rate

of Change (di/dT) ¾ Inrush restraint, Loss Of

Source ¾ Event Details: ¾Fault magnitude, related

hi-res waveform

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Ample Software Foundation for Sentient’s Grid Analytics System (GAS)

¾ Complete sensor management ¾ Multiple DNP masters – directly connect to devices ¾ Analytics Software: ¾ Interval Logging - Current and Conductor Temperature per

phase ¾ Fault Location along the feeder and on what phase ¾ Phase Identification ¾ E-Field – monitors reverse flow of current ¾ Disturbance Management (Momentary/Incidents) –

Waveforms ¾ Easy to integrate ¾ APIs for historian integration ¾ Role level security

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Pilot Approach: 9 Sensors

¾Deployed 3 sets of sensors on 2 distribution feeders

¾Deployed at 2 substation feeder exits and 1 feeder midpoint

¾Developed ROI measurement ¾Value of Lost Load +

Operational Cost per SAIDI Minute

¾ Focused on disturbance management

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Disturbance Management what is a disturbance?

¾ A disturbance is a small and momentary change in current/e-field waveforms.

¾ Characteristics of a disturbance are: ¾ Disturbances usually do not cause a

sustained power interrupt ¾ Magnitude is usually 1-5 times normal

current (faults can cause > 15 times increase in current)

¾ Duration usually lasts less than 5 cycles (5 – 80 milliseconds)

¾ Distortions: 1st to 50 harmonic content (Sentient can detect up to 31st harmonic in underground solution)

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Pilot Results: Disturbance Management Trees grow into lines Control Center sees elevated

disturbance counts

Electric Ops finds tree

making contact with

B&C phase, trims

trees to prevent

outage, disturbances

return to normal

Avoided SAIDI: 2.66 min.

Avoided Cost: $16,770

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Change in workflow

Operator

receives fault

data from

Sensors

Runs fault

location tool

in OMS

Provides

operations

with

predicted

location of

fault

Operations

makes repairs

and reports

back results

for ROI

Calculation

Operator sees

fault

If fault data is

available

provide

prediction of

fault

Operations

will make

decision on

whether to

run out circuit

No report

usually

provided

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Calculating ROI

Avoided Costs(ROI) =

Value of Lost Load (VOLL) +

Operational Cost Per SAIDI Minute(OCPSM)

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Pilot Results

¾Delivered 2.66 SAIDI minute reduction through disturbance management ¾$16,770 in VOLL+OCPSM savings ¾SAIFI reduction

¾Communication through AMI network worked as designed

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Phase 2: 60 Sensors

¾Deployed 20 sets of sensors on 18 distribution feeders ¾Deployed on feeders with old

relays that did not report fault amplitude ¾Positioned at midpoint of circuit

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Benefits: Phase Identification

¾Identifies phase miss-match and reports detected phase

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Benefits: Phase Balancing

¾ Allow decision making based on facts not estimates

¾ Planning, load flow, dynamic loading application data

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Benefits: Disturbance Monitoring

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Benefits: Fault Detection ¾ Enables waveform capture, storage and analysis ¾ Precisely determine boundaries of disturbance using patent-pending algorithm ¾ Supports automatic or manual retrieval of waveforms ¾ Foundational component for disturbance analysis and event categorization ¾ Capture momentary and transient events for further analysis ¾ Instrument-class, sampling rate, “Oscilloscope on the wire”. True 130 samples/cycle.

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Benefits: Fault Locating 20

Benefits: Temperature Monitoring

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Success

Predicted Location Actual Location

Fault Waveform

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Success

Faulted Element:

Broken Insulator

Cause: Lightning

Avoided SAIDI: 2.66 min.

Avoided Cost: $28,329.81

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Success

Issue Fixed on 7/20 – Disturbance counts fall off

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Phase 3: 66 Sensors

¾Currently deploying 22 sets of sensors ¾Deploying at feeder substation

exits to maximize coverage for disturbance management

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Results 26

Results

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Results

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Results

¾Avoided SAIDI: 5.32 Minutes ¾Avoided Costs: $45,100.30 ¾Avoided Interruptions: 1,760 ¾SAIFI Reduction: 0.04 ¾Improved System Resiliency ¾Improved Customer Experience

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Lessons Learned

¾Deployment at substation feeder exit yields maximum disturbance management coverage ¾Get it in the hands of System

Operators early ¾Develop metrics, track and brag on

success – resulted in increased buy-in

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Future Plans

Continue deployment of MM3

Q3 2018: Pilot ZM1 “Low

Amp” Line Monitor

Q4 2018: Pilot UM3+ UG

Line Monitor

Q4 2018: Launch NBU

UAV Program

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Questions? 32