GHG EMISSION CONTROL- A PROACTIVE ELECTRICAL ASSET MANAGEMENT

THROUGH ULTRASOUND TECHNOLOGY

Event/Meeting

Date & Venue

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Problem Definition

RMU Flashover SF6 Gas Leakage

High Revenue Losses due to R&M Cost

Unsafe WorkingEnvironment

High Down Time

Customer dissatisfaction

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Present technology not sufficient to prevent RMUs failure and gas leakage

SF6 gas Leakage from RMUs adding to Global warming

Switch Gears produce sound before the abnormality becomes critical

Sound is produced due to ionization which in infant stage is in Ultrasound region and the sound is variable

Corresponding to the sound, there must be a pattern as well

Analysis of the wave pattern produced due to ionization can be used to identify the nature of fault and the criticality

Outcome of Analysis

Need of a Technology:Proactively Detects the Abnormality in the RMUs

Fix the Gas Leakage Problem

They are more directional and travel in a straight line. Localized to the source of emission.

Discharges in Power system that generally produce Ultrasonic Frequency:

Characteristic Phenomena

Arcing

Tracking

Corona

Not possible to capture at the

initial stage

Not possible to detect by other

methods like Infrared Scanning

No standard guideline

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CORONA IDENTIFICATION

• Hissing Noise• Uniform peaks at equal

intervals of time• Frequency domain pattern

has harmonics of the line frequency and they are visible in its pattern

• Corona discharge happens at the peak of the cycle

• Corona discharge produces ozone and nitrous oxide

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• Low current pathway from top to ground through the insulator.

• Can happen anywhere in the positive cycle.

• Harmonics are not present.

• Less uniformity in pattern and popping sound occurs.

• Advantage: Identification at this stage can prevent the switch gear failure

TRACKING IDENTIFICATION

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• High Current pathway from top to ground through insulator which don’t even require high voltage.

• It is quick and abrupt with buzzing sound.

• Burst of Energy extending for large periods of time.

• Most random pattern so it is easily recognizable.

ARCING IDENTIFICATION

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2012-20130

200

400

600

800

1000

1200

1400

1600

1800

20001845

240

No. of RMUs ScannedNo. of RMU Failed

Global and Local Impact Greenhouse gas leads to Global

Warming Amount of SF6 Gas in each RMU

breaker chamber= 3 Kg Global Warming Potential of SF6 gas=

23900 For a Failure of one RMU, SF6 Gas

escaped= (23900*10-9 *3=) 0.0000717 Million Metric Tons of Carbon-di-Oxide Equivalent (MMTCDE).

In 2012-2013, 240 Nos. of RMUs failed resulting into the escaping of SF6 gas equivalent to(0.0000717*240=) 0.017208MMTCDE

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Ultrasound Scanning

Abnormality Frequency(Hz) Intensity

Corona50,100,150,200,250,300,350…all harmonics

Between -8.0 dBμV to -5 dBμV

Tracking 50,100,150,200.Between -5.0 dBμV to -2.0 dBμV

Arcing No component of Line Frequency

Greater than -2.0 dBμV

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Proactive SF6 Gas Leakage Detection and Fixing

Proactive SF6 gas Leakage Detection in the Switch Gears is done using a gas leakage detector.

Leakage points are marked for further action.

Unique compound consisting of poly chlorides is used as corrective action for the leakage points identified

Refurbishment of 5 nos. of breaker chambers that have even exploded using the unique compound thus reusing and revenue saving is also ensured

GAS Leakage Detector

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No. of RMUs

ScannedAbnormal

RMUsRMUs Failed

RMUs Saved

SF6 Escaped/ Prevented(MMTCDE)

2012-2013 1845 NA 240 0 0.0172080

2013-2014 2200 238 30 208 0.0149136

2014-2015 2565 250 14 236 0.0169212

2015-2016 3200 268 7 261 0.0187137

SF6 Gas Escaped Into Atmosphere

SF6 Gas Prevented From Escaping Into Atmosphere

Curtailed SF6 Gas Emission

Ultrasound Technology accompanied with Gas Leakage Detection have made it possible to diagnose Switch Gears in a way like a Doctor diagnoses patients

From 2013-14 to 2015-16, around 750 nos. of RMUs have been prevented from failure accounting to stopping of 0.05 MMTCDE from escaping into the environment which is around 2% of GHG emitted in India per year

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Another Step: App for Carbon Reduction Man-Hour Optimization Earlier 20 Switch Gears Inspected per

dayNow 30 to 35 Switch gears are Scanned per day using the App. For Scanning the same number of switch

gears, number of vehicle based trips reduced by 50% reducing carbon emission.

Centralized Data Record Center Earlier paper was used to record

data on site.Now data recording through app has quashed the use of Paper. Scanning Data is available to

everybody at all the time without using paper.

Thank You