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Dielectric Oil Test Set FamilyModel OTS

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Agenda for Discussion

ApplicationsCustomersOTS Product Range ImprovementsCustomer Common Key IssuesCustomer Issues Resolved by OTSKey FeaturesOTS Configured to Order

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What is the test looking for?

Aging and / or oil contamination by changes in…• Electrical properties

–Moisture content–Chemical contamination–Solids & particles

Change in conditions inside apparatus due to..• Arcing • Overheating • Vibration

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How is the Test PerformedThe test involves application of a rising voltage (at a set rateof rise) across a specially shaped brass electrodes within a container of a specific volume.For specific standards, the oil is circulated within the container – to replicate convection seen in oil within transformers.The test is repeated for a pre-determined number of times, waiting between tests and averaging the results.The pass/fail is pre-dermined for specific international standards, and differs for different customers.

Electrodes used within different standards

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Why test the oil breakdown voltage?

A quick and easy test for equipment in service for:• Detecting oil moisture and contaminant content before

catastrophic failure• Predicting remaining transformer life• Maintaining equipment safety• Fire prevention• Maintaining reliability

Checking new oil prior to filling new equipmentAcceptance of new oil deliveries

• Bulk oil shipments• Separate drum filling of small tank• Re-processing of used oil

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Applications

Testing dielectric strength of oil used in:• Super-grid transformers in Transmission systems• Distribution transformers at Regional Electrical sites• Regulating transformers• Instrument transformers• Reactors• Circuit breakers• Cables• Bushings• Capacitors

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What does the oil do?

Used as an insulation mediumCooling by circulation

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Customers

Utility contractors• Substations mainly

Power Utilities• Power Stations mainly

Service ProviderRail Companies

• Including locomotive HV step down transformers and switchgearOil test Lab / House / Company

• Providing testing service to all of the aboveTransformer / switchgear Manufacturer (OEM)Oil companies

• Testing new oil during manufacturing

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Product Range ChangesMegger Old Range

• Laboratory instruments– OTS60AF/2– OTS80AF/2– OTS100AF/2

• Portable instruments– OTS60PB

– OTS60SX

Megger New Range• Laboratory instruments

– OTS60AF– OTS80AF– OTS100AF

• Portable instruments– OTS80PB

– OTS60PB

– OTS60SX Continues

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Customer Common Key Issues1. Too heavy/bulky for field use2. “Oil testing is a messy business”3. Unreliable results4. Standard testing is complex5. Instrument is too fragile6. Ease of test result recording and reporting 7. Ownership costs8. Change of test standards

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1. Heavy to carry (portable use)

New Portable Units Lightest in the World• OTS60PB from only 15.38 kg• OTS80PB from only 19.48 kg

Important Health and Safety issue Even the OTS100AF from only 29.58kgNew ergonomic integral side handles

• Provides natural lifting position

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1. Heavy to carry (portable use)

Visual size / weight differences

OTS80PB OTS60PBOTS60AF OTS80AF OTS100AF

From 65 lb

From 42.9 lb From

33.9 lb

Laboratory unit Portable unit Portable unit

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1. Heavy to carry (portable use) - cont

Optional padded carry bag for portable unitsOptional transport case for portable units

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2. “Oil testing is a messy business”

All OTS range share common test vessel featuring:• Unique easy pour spout• Unique easy clean shape

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2. “Oil testing is a messy business” ……continued

OTS have unique test chamber drain• Easy removal of accidentally spilt oil• Pipe located on rear of instrument• Could be plumbed into laboratory waste oil system

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2. “Oil testing is a messy business” ……continued

Unique test chamber design shaped for easy clean• No sharp edges or contours

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2. “Oil testing is a messy business” ……continued

ASTM D1816 testing Fill oil to level mark and fit impeller lidBaffle excludes air without displacing oil from vessel

No mess, baffle sits on oil

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3. Reliable test resultsPrecision electrode gap adjustment

• Quick and easy to adjust

Unique electrode gap locking mechanism• Prevents gaps moving through handling• Prevent accidentally moving adjustment

• New accurate and smooth gap gauges

Precision thumb wheel electrode gap adjustment

Gap is then locked with unique mechanism

Precision thumb wheel electrode gap adjustment

Gap is then locked with unique mechanism

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3. Reliable test results …..continued

Transformer Design• Limit dissipated power in arc• Reliability, more rugged

Direct Output Breakdown Detection• Improved accuracy• High speed disconnection time

Breakdown detection both in terms of current and voltage

• Compliance with ASTM and IEC requirements

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3. Reliable test results …..continued

Optional new voltage calibration meter VCMD100• Not oil filled so no leaks• Highly visible LED display• Digital for ease of reading• Confidence in results

Built in automatic temperature measurement• Auto recorded on all test results• Standards specify temperature of sample• E.g. IEC require 20 ºC ± 5 ºC

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4. Standard Testing is too ComplexOTS Portable user interface

Clear colour displayEasy navigation keysIntuitive menu system

OTS Laboratory user interface

Additional keys for easy data entry

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5. Instrument is too fragile

Internal transformers and components able to handle rugged transport Extremely strong Polycarbonate display and chamber lidLarge impact absorbing corner mounted rubber feetImpact and chemical resistant plastic test vessels

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5. Instruments are too fragile - cont

Tough chemical resistant key padsOptional transport case for portable unitsOptional padded carry bag for portable units

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6. Test result recording and reporting

Test results are saved to: • Internal memory• USB stick

– Saves carrying the portable instrument into the office

• or a print outAll at the press of a buttonCan accommodate up to 10 breakdownsBar Code Scanner – fast automated results

Scrolled down on display

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6. Ease of test result recording and reporting …….continued

All OTS AF* come with PowerDB Lite as standard• Quickly produce professional report forms

All new OTS PowerDBcompatible

* OTS PB TBA

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7. High Cost of Ownership

More robust design means less likely to be in the repair shop, less transport cost to and from repair shop, more trusted resultsHigh quality, built to last, no need to replace for many years to come.New breakdown tolerances and voltage accuracy means less doubt in results, and faster testing when readings are questioned. Low cost additional or replacement test vessels.

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8. Change to Test Standards

Preloaded standards can be updated via a USB memory stickNew standards can be updated via a USB memory stickUsers can produce new custom tests by adding new or modifying an existing one and saving to new test nameNew or amended standards may be downloaded from www.megger.com

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CONCLUSION - Key Features

1. Lightest portable (PB) models in market2. Precision test vessel with lockable electrode

gap setting3. Transfer of results via USB flash drive plus

updating new test standards 4. Ultra fast (< 10 μs) HV switch off time –

Consistent results5. USB barcode scanner (AF only) 6. All new OTS share common accessories7. VCM100D / VCM80D check meter (option)8. Automatic oil temperature sensing 9. Sunlight readable colour display and intuitive

user interface

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New OTS Configured to Order

Flexible order options to suit customer requirements and / or budget

Order code configuration determined on Data sheet

OTS60PB OTS80PB OTS60AF OTS80AF OTS100AFConfigured items Options

Built inNot fitted

NiMH (light weight)Lead Acid (low cost)Mains supply only

UK plug fittedEU Schuko plug fitted

US plug fittedAustralian plug fitted

No plug fittedSupplied

Not SuppliedASTM (cylindrical and mushroom)

IEC (Spherical and mushroom)Full set (ASTM and IEC)

SuppliedNot Supplied

Electrode set (shape) supplied

Carry case

Battery

Mains / Line supply lead

Printer

Vessel lid mounted impeller stirrer