Megger OTS80PB User manual

OTS80PB and OTS60PB
OTS100AF, OTS80AF and OTS60AF
Oil test set
User Guide

This document is copyright of:
Megger Limited, Archcliffe Road, Dover, Kent CT17 9EN. ENGLAND
T [phone] F [phone] www.megger.com
Megger Ltd reserves the right to alter the specification of its products from time to time without
notice. Although every effort is made to ensure the accuracy of the information contained within
this document it is not warranted or represented by Megger Ltd. to be a complete and up - to - date
description.
For Patent information about this instrument refer to the following web site:
megger.com/patents
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Declaration of Conformity
Hereby, Megger Instruments Limited declares that radio equipment manufactured by Megger Instruments Limited
described in this user guide is in compliance with Directive 2014/53/EU. Other equipment manufactured by Megger
Instruments Limited described in this user guide is in compliance with Directives 2014/30/EU and 2014/35/EU where they
apply.
The full text of Megger Instruments EU declarations of conformity are available at the following internet address:
megger.com/company/about-us/eu-dofc
This manual supersedes all previous issues of this manual. Please ensure that you are using the most recent issue of this
document. Destroy any copies that are of an older issue.
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Contents
1. Safety Warnings ........................................................................................................................ 6
2. Symbols used on this instrument............................................................................................. 7
3. General description................................................................................................................... 8
4. Features and benefits ............................................................................................................. 10
5. Applications............................................................................................................................. 11
6. Instrument controls and indicators........................................................................................ 12
6.1. Keypad and internal printer panel..............................................................................................12
6.2. Rear panel.....................................................................................................................................13
7. Preparations for use................................................................................................................ 14
7.1. Getting started .............................................................................................................................14
7.2. Supply voltage ..............................................................................................................................14
7.3. Assembly ......................................................................................................................................14
7.4. Test vessel preparation.................................................................................................................15
7.5. Calibration ....................................................................................................................................19
7.6. Stirrer options...............................................................................................................................19
7.7. Ordering Information ..................................................................................................................19
8. Operating instructions............................................................................................................ 20
8.1. Top level tabs................................................................................................................................20
8.2. Navigation and character entry...................................................................................................21
8.3. Pinyin entry:..................................................................................................................................22
8.4. Setting favourite test standards ..................................................................................................26
8.5. Performing a breakdown or withstand test ...............................................................................26
8.6. Test in progress.............................................................................................................................26
8.7. Test results ....................................................................................................................................27
9. Manage test standards ........................................................................................................... 28
9.1. Custom tests..................................................................................................................................28
9.2. Withstand tests.............................................................................................................................28
9.3. Editing test parameters ...............................................................................................................28
9.4. Basic memory functions ...............................................................................................................30
9.5. Transfer results to USB flash drive...............................................................................................30
9.6. Print quality and changing paper ...............................................................................................31
9.7. Vessel and electrodes ...................................................................................................................31
9.8. VCM100D/VCM80D.......................................................................................................................31
9.9. Test vessel motorised stirrer.........................................................................................................31
10. Preventive maintenance ....................................................................................................... 32
10.1. General........................................................................................................................................32
10.2. Cleaning ......................................................................................................................................32
10.3. Care for OTS electrodes .............................................................................................................32

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10.4. New electrodes ...........................................................................................................................32
10.5. Electrode storage .......................................................................................................................32
10.6. Cleaning oxidised/dirty electrodes ............................................................................................32
11. Technical specifications ......................................................................................................... 33
11.1. VCM100D/VCM80D voltage check meters technical specification ..........................................34
11.2. Storage and transportation .......................................................................................................34
12. PowerDB software ................................................................................................................ 35
13. Accessories and Equipment.................................................................................................. 36
13.1. Factory fitted accessories ...........................................................................................................36
13.2. Optional Accessories ..................................................................................................................37
14. Repair and warranty ............................................................................................................. 39
14.1. Instrument repair and spare parts.............................................................................................39
14.2. Approved repair companies ......................................................................................................39
14.3. Returning a test set for repair ...................................................................................................39
15. End of life disposal................................................................................................................ 40
15.1. WEEE ...........................................................................................................................................40
15.2. Batteries ......................................................................................................................................40
15.3. OTS60PB/ OTS80PB ....................................................................................................................40
15.4. Declarations of conformity ........................................................................................................40

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Safety Warnings
1. Safety Warnings
Warning: the OTS must be used by only suitably trained and competent persons. If these instruments are
not used in the manner specified protection may be impaired
Safety warnings and precautions must be read and understood before the OTS is used. They must be observed during
use.
The OTS must be used only in the way intended and for the stated purposes described by Megger.
The OTS must not be used if any part of it is damaged.
The OTS must be properly earthed. A supplementary earth terminal is provided.
Position the OTS so that power can be easily removed.
The OTS must not be used in wet locations or with rain falling on the instrument.
The OTS must be used only for testing electrical grades of insulating liquids. No other objects or substances
should be placed in the test chamber.
The OTS must be used only with one of Megger’s precision test vessels or VCM100D/VCM80D correctly fitted on
the support horns in the test chamber.
Replacement fuses must be of the correct type and rating.
Calibration or repair must be carried out only by a Megger qualified repair facility.
The test chamber must be kept clean and free from lint or other fibres.
The OTS80PB/OTS60PB weighs between 16.8 kg and 20.8 kg.
The OTS100AF/OTS80AF/OTS60AF weighs 30 kg.
Care should be taken when lifting the instrument.
It is prohibited to insert foreign objects into any gap on the instrument before or during a test.
Unit must be used in a well ventilated location. Small quantities of ozone may be created after prolonged
testing.

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Symbols used on this instrument
2. Symbols used on this instrument
Icon Description
FHIGH VOLTAGE: risk of electrical shock.
GCaution: Refer to User Guide.
Equipment complies with current EU directives.
Equipment complies with current UKCA legislation.
N13117 Equipment complies with current ‘C tick’ requirements.
Do not dispose of to landfill, sewage systems or by fire.
tDOUBLE INSULATED. This equipment has double or reinforced insulation throughout.
dDC voltage.
aAC voltage.
gEarth terminal.
fFuse.
USB terminal.

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General description
3. General description
Megger’s Oil Test Sets are liquid dielectric breakdown and
withstand testers.
The OTS80PB, OTS60PB models are portable instruments,
designed for use in the field, where as the OTS100AF,
OTS80AF and OTS60AF are designed for laboratory use.
They are fully automatic, powered by battery (model
dependent) or mains and facilitate accurate breakdown
voltage tests and withstand voltage tests on mineral, ester
and silicon insulating oils. The precision test vessel sets the
accuracy standard for the liquid insulation test industry.
For ease of use the instrument comes pre-programmed
with a ‘library’ of international breakdown and withstand
test standards and the ability to create custom tests.
The instrument is housed in a metal case with moulded
end caps that accommodate convenient carry handles.
The test chamber is designed with an easy-clean surface and provides a drain for spilt oil through an internal pipe
routed to the rear of the instrument. A beaker or similar can be used for spillage collection. The test area is covered
by a plastic lid with an electrically protective inner conductive layer which, with the metal case, provides a safe
equipotential enclosure for high voltage testing.
The lid allows in plenty of ambient light and users are able to view the test and witness stirring and the breakdown.
The chamber lid is dual redundant safety protected with micro-switches to prevent accidental electrification.
The advanced test vessel design yields highly accurate and repeatable results. Two stirring options are available; an
internal magnetic bean stirrer which is dropped into the oil and lid mounted impeller that conforms to the oil test
standards. Stirring during breakdown and withstand testing is employed to produce an homogeneous distribution of
contaminants within the oil and to free any carbon generated between electrodes during testing.
Electrode gap is set by precision adjustment wheels that lock in position ensuring that the electrodes do not move
during a busy day in the field. It is, however, advisable to check the electrode condition and gap daily because it
is a critical parameter in breakdown voltage testing. Flat anodised Aluminium gap setting gauges are supplied in
popular sizes to facilitate electrode gap setting. Electrodes are detachable and are available in shapes that meet all
international standards, i.e. disk, spherical and mushroom (VDE) electrodes.
A selection of international breakdown and withstand tests are chosen from a library of standard sequences
and started from the user friendly menu on the LCD display. The top level test screen displays all pertinent test
information to ensure the correct electrodes are used with the specified electrode gap setting.
Results are viewed on screen and printed on the internal printer following a test result. In the event of a breakdown
not occurring before reaching the maximum voltage, the instrument will return maximum voltage. This is a safety
measure to ensure the instrument is not driven over its designed maximum voltage.
Safety features incorporated in the design include dual safety micro-switches and zero volt touch bar, the screened
chamber lid and convenient power supply On/Off switch. Pressing any button during a test will immediately remove
the high voltage and terminate the test. It is important to earth this instrument using the ground connection at the
rear of the instrument to ensure safe operation.

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General description
OTS PB models
The OTS60PB (60 kV) and OTS80PB (80 kV) oil test sets are small and the lightest on the market with weight ranging
from 16.8 kg to 20.8 kg depending on model. There is an optional carry bag and transport case. The carry bag has
pouches for electrode accessory pack, leads, quick user guide, paper roll etc. These units are available mains powered
and NiMH battery operated for additional flexibility in portable applications.
Customers should be mindful of the need to maintain battery capacity. The NiMH battery should be operated from
battery without line power periodically to ensure maximum battery life.
OTS AF models
The OTS60AF (60 kV), OTS80AF (80 kV) and OTS100AF (100 kV) models have much a larger test chamber for even
easier access and cleaning, particularly useful in a lab environment. They are fitted with a 12 key alpha-numeric
keypad to facilitate entry of test ID, file names, notes etc. Alpha characters are entered by repetitive pressing on a
key, the same way as text is entered in modern cellular telephones. The AF models also have the ability to use a USB
barcode reader to scan oil sample barcode labels, ideal for better integration with a LIM system.

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Features and benefits
4. Features and benefits
Fully automatic breakdown and withstand tester with test voltages
up to 100 kV / 80 kV / 60 kV depending on model
Advanced 400 ml oil vessel with accurate electrode gap setting and adjustment locking mechanism
Flat electrode gap gauges that will not damage electrodes
Easy clean test chamber with oil drain
Magnetic bead stirrer or lid mounted impeller
Rapid response to trip (<10 μs)
Automatic oil temperature measurement
Intuitive user interface with backlit QVGA colour display (visible outdoors)
Simple transfer of test results via USB flash drive
USB barcode reader scans oil sample barcode labels (AF models only)
Optional VCM100D/VCM80D voltage check units measure voltage directly
Optional carry case with shoulder strap (PB models only)
Optional transport case (PB models only)