Megger OTS100AF Bedienungsanleitung

OTS100AF, OTS80AF & OTS60AF

Laboratory Oil Test Set

USER GUIDE

G SAFETY WARNINGS

Safety warnings and precautions must be read and understood before the OTS100AF/OTS80AF/OTS60AF is used.

They must be observed during use.

 The OTS100AF/80AF/60AF must only be used in the way intended and for the stated purposes described by

Megger.

 The OTS100AF/80AF/60AF must not be used if any part of it is damaged.

 The OTS100AF/80AF/60AF must be properly earthed. A supplementary earth terminal is provided.

 Position the OTS100AF/80AF/60AF so that power can be easily removed.

 The OTS100AF/80AF/60AF must not be used in wet locations or with rain falling on the instrument.

 The OTS100AF/80AF/60AF must only be used for testing electrical grades of insulating liquids. No other objects

or substances should be placed in the test chamber.

 The OTS100AF/80AF/60AF must only be used 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 only be carried out by a Megger qualiﬁed repair facility.

 The test chamber must be kept clean and free from lint or other ﬁbres.

 The OTS100AF/80AF/60AF weigh 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.

NOTE

THE OTS100AF/OTS80AF/OTS60AF MUST ONLY BE USED BY SUITABLY TRAINED AND

COMPETENT PERSONS.

IF THESE INSTRUMENTS ARE NOT USED IN THE MANNER SPECIFIED PROTECTION

MAY BE IMPAIRED

Heading 1

heading 2

heading 3

Symbols used on this instrument

GCaution: refer to accompanying notes

FDanger high voltage, risk of electrical shock

DC voltage

aAC voltage

cEquipment complies with current EU Directives

uEarth terminal

fFuse

USB terminal

Equipment complies with ‘C tick’ requirements

Do not dispose of in the waste stream

Contents

Safety warnings 2

Symbols used on this instrument 3

General description 5

Features and beneﬁts 6

Applications 6

Instrument controls and indicators 7

Keypad and printer panel 7

Rear panel 8

Preparations for use 9

Getting started 9

Supply voltage 9

Assembly 9

Instrument setup procedure 9

Calibration 9

Test vessel mortised stirrer 9

Transportation and storage 9

Operating instructions 10

Top level tabs 10

Navigation and character entry 11

Set favourite test standards 12

Performing a breakdown test 12

Test in progress 12

Test results 12

Custom tests 13

Basic memory functions 14

Transfer results to USB ﬂash drive 14

Print quality and changing paper 15

Vessel and electrodes 15

VCM100D/VCM80D 15

Test vessel motorised stirrer 15

Preventive maintenance 16

General 16

Cleaning 16

Care for OTS electrodes 16

New electrodes 16

Electrode storage 16

Cleaning oxidising/dirty electrodes 16

Technical speciﬁcations 17

OTS100AF/80AF/60AF technical speciﬁcation 17

VCM100D/VCM80D voltage meters technical speciﬁcation 18

Storage and transportation 18

Accessories and equipment 19

Optional 19

Spares 19

Repair and warranty 20

General description

Megger’s OTS100AF/80AF/60AF Oil test sets are laboratory

liquid dielectric breakdown testers. They are fully automatic,

line powered and facilitate accurate breakdown 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 instruments come pre-

programmed with a ‘library’ of international breakdown test

standards and the ability to create custom tests.

The instrument is housed in a metal case with moulded

end caps that accommodate 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 transparent lid with

an electrically conductive screen which, with the metal case,

provides a safe equipotential enclosure for high voltage testing.

The lid allows in plenty of ambient light enabling users to conﬁrm stirring and the witness breakdown. The chamber lid

is dual redundant safety protected with micro-switches to prevent accidental electriﬁcation. A zero volt touch bar at the

entrance to the chamber enhances safety to for the user.

The precision 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 an optional lid mounted impeller that conforms to

ASTM D 1816 requirement. Stirring during breakdown testing is used 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. It is, however, advisable to check the electrode condition and gap daily because it is the most 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 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 either an external USB printer or 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 result. This is a safety measure to ensure the instrument is not driven over its designed maximum voltage.

The instrument automatically turns off the display 15 minutes after completion of a test sequence or last use.

Safety features incorporated in the design include the safety micro-switches and zero volt touch bar, the screened

chamber lid and an easily operated power supply On/Off switch. Pressing any button during a test will immediately

remove the high voltage and terminate the test.

Features and beneﬁts

 Fully automatic breakdown 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 optional lid mounted impeller (conforming to ASTM D 1816)

 Direct trip control employing voltage and current measurement

 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

 Optional VCM100D/VCM80D voltage check units measure voltage directly

Applications

The OTS100AF/80AF/60AF are used for determining the dielectric strength of high voltage insulating liquids, such as

the insulating oils used in transformers, switchgear and other electrical apparatus. The dielectric breakdown voltage

is a measure of the insulating ability of a liquid to withstand electrical stress. Contaminants such as cellulosic ﬁbres,

conducting particles, dirt, and water reduce breakdown voltage of an insulating liquid. A low result indicates the

presence of one or more of these contaminants.

The test set is fully automatic. The operator has simply to prepare the test vessel, load it with sample oil, place it in

the test chamber, select the appropriate speciﬁcation for the tests and then start the test sequence. The test set

automatically carries out the sequence of tests as deﬁned by the pre-selected national speciﬁcations. Oil testing

speciﬁcations, for which the sets are pre-programmed, are as follows:

 ASTM D 1816-04

 ASTM D 877 A & B

 BS EN 60156

 CEI EN 60156

 IEC 60156 1995-05

 IRAM 2341-72

 JIS C2101-99 (M) & (S)

 PA SEV EN 60156

 UNE EN 60156

 NF EN 60156

 SABS EN 60156

 VDE 0370 Part 5

 AS1767.2.1

A critical factor with respect to ﬁeld testing of oil is its temperature, because samples from a transformer taken shortly

after switch off can be many degrees hotter than equivalent room temperature laboratory tests performed at 20 ºC to

23 ºC. The OTS100AF/80AF/60AF instruments measure the oil temperature during the test so that temperature

correction can be applied to results.

NB: Certain standards require ﬁeld tests to be performed between 20 ºC and 30 ºC.

Instrument controls and indicators

Keypad printer panel

The control panel, illustrated below, is located to the front right side of the instrument and contains a QVGA colour

screen (1), navigation keypad with ‘OK’ (6) button and a ‘TEST’ (4) button. The operation is user friendly and driven

from six top level windows. A start-up LED (2) is used during instrument initialisation. The lower, vertical section of the

front panel houses an ON/OFF power switch and a USB Type A interface socket

Item description

1. 3.5 inch, backlight, bright colour

QVGA display

2. On/off LED

3. External power LED / icon

4. TEST’ button with associated red

warning LED

5. 12 key alphanumeric keypad

6. Navigation keypad with ‘OK’ select button

The instrument printer panel, shown below, houses the optional internal printer. A ﬂat panel replaces the printer if not

ordered. The printer is a dot matrix impact printer with 57.5 mm wide paper roll. Paper results printed on this printer

will not blacken in high temperatures. The panel has two locking studs and a central print advance button.

Rear panel

The rear panel illustrated below accommodates all connections to the instrument with the exception of a front

facing USB interface.

Item description

1. Ground connection with cable lug

2. IEC line power socket

3. Fuses

4. USB Type A socket

5. USB Type B socket

Line power is applied via an IEC socket (2) and is fused (3). It is mandatory for safe operation that an earth ground

cable is attached to this instrument before performing tests. The ground connection is identiﬁed as item 1 in the

illustration. Attention must be paid to product warnings and markings.

Two USB interface connectors, one type A (4) and one type B (5), offer USB host and device interfaces. A second USB

type A (host) interface is located on the front of the instrument for user convenience. The USB type A interface (4) is

used to drive a printer or ﬂash/hard disk drive.

1 2

345

Preparations for use

Getting started

It is important to read the user guide thoroughly before operating the OTS100AF/80AF/60AF for the ﬁrst time. The

safety warnings are particularly important.

Supply voltage

Before connecting line power to the instrument the ground connector should be connected to a suitable earth point.

The OTS100AF/80AF/60AF are designed to operate on 50/60 Hz AC line power in the range 90 to 265 V.

Assembly

 Unpack instrument and contents of the packing box.

 Ensure that the instrument is placed on a solid surface or table with sufﬁcient working space.

 Connect ground to a suitable earth connector.

 Fit selected electrodes to the threaded shafts in the test vessel taking care not to scratch electrode surfaces.

Electrodes should be hand tightened onto the shafts to prevent any movement during use.

 Adjustment of the electrode gap should be done with the feeler gauges provided, adjustment wheels locked and

the gap rechecked.

 Fit test vessel into instrument chamber.

 Connect line power.

 Turn on the instrument.

 Follow the instrument setup procedure detailed below.

Instrument setup procedure

The required language option is selected from the top level tabbed window. The ﬂag symbol is used as an icon

representing language option. Simply use the up/down arrow buttons to use the right arrow key to navigate across the

tabs to the language screen, select the required language and press ‘OK’.

The following actions, accessed from the Settings tab window, should be taken before running a test for the ﬁrst time:

1. Set date and time – Time/Date option.

2. Adjust the display backlight for optimum legibility – Display Setup option.

3. Select units - metric or imperial.

4. Set printer options.

A library of international oil test standards is preloaded intot hte instrument. It is important to select the test standards

that will actually be used to prevent having to navigate through the complete list. Navigate across the top level tabs

using left/right arrow buttons to the ‘Tools’ window and use the up/down arrow buttons to go to ‘Select Favourite

Tests’.

Navigate to a required test and press OK to select or deselect a standard test. Functions like, ‘SELECT ALL’ and ‘RETURN’

when all required standard tests have been selected.

Calibration

The OTS100AF/80AF/60AF are calibrated in the factory prior to delivery so there is no need to calibrate on initial setup.

The VCM100D/VCM80D voltage check devices can be used to conﬁrm the output voltage of the instrument by reading

the voltage directly at the electrode before running tests. Periodic checking of actual test voltage using the VCM100D/

VCM80D is recommended. The voltage check test is accessed from the Tools tab window.

Test vessel mortised stirrer

Unpack the optional motorised stirrer assembly from its box and ﬁt the stirrer shaft to the underside of the stirrer

assembly. The unit is ready for use. The oil test vessel lid is removed and the stirrer assembly used as a lid for tests that

require stirring.

Megger supplies as standard with the stirrer lid assembly the large red impeller which is useful for very dirty oil. This has

larger blades to help ensure the effective circulation of any particulates between the electrodes during the test so that

the full potential of their effect on breakdown voltage may be assessed.

The other two impellers are alternative impellers. The Impeller on the left is optimised for IEC 60156, whilst the one on

the right is ideal for ASTM D1816.

Vigorous circulation can exacerbate the inclusion of any moisture captured on the surface ﬁlm of oil left behind after

rinsing at the vessel preparation stage, making the need for rapid ﬁlling even more critical, so as not to detrimentally

affect breakdown results.

Refer to application note ref “OTS_VESSEL_AN_en” for further information on vessel and impeller preparation.

Note: this colour highlighted text from OTS vessel app note

Transportation and storage

The OTS100AF/80AF/60AF are precision instruments that generates HV up to 100 kV depending on model and needs

to be transported and stored carefully.

The unit should be stored in a room or area where the environment is within the temperature range of -30 ºC to 65 ºC

and maximum humidity of 95% at 45 ºC.

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