Megger OTS60SX/2 User manual

M
OTS60SX/2
Semi Automatic Oil Test Set
User Guide

Contents
Safety Warnings 3
General Description 4
Preparing the Oil Test Set 5
Operation 5
Oil Sampling 5
Preparing the Oil Test Vessel 5
Control Panel 6
Breakdown Testing 6
Withstand Testing 6
Warning messages 7
Testing to National Standards 7
Sampling and Testing Oil for Dielectric strength 8
Oil Testing Specifications 10
Test Set Specification 11
Accessories 12
Repair and Warranty 13
2.

3.
SAFETY WARNINGS
■Safety warnings and precautions must be read and understood before the instrument is used.
They must be observed during use.
■The oil test set must be properly earthed.
■The test chamber must be kept scrupulously clean.
■If the test chamber cover is cracked or damaged in any way the test set must not be used, but sent for repair to an authorised agent.
■The chamber door hinges are fitted with earth contact springs. These must not be damaged or corroded.
■The correct type of oil test vessel must be used, and correctly positioned on the support horns before carrying out any testing.
■Replacement fuses must be of the correct type and rating.
NOTE
THE TEST SET MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS.
TO PREVENT DAMAGE DO NOT TRANSPORT INSTRUMENT WITH TEST CELL FITTED IN TEST CHAMBER.
WEEE DIRECTIVE
The crossed out wheeled bin symbol placed on Megger products is a reminder not to dispose of the product at the end of its life with general waste.
Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. The Registration No is WEE/HE0146QT
For further information about disposal of the product consut your local Megger company or distributer or visit your local Megger website.
Symbols used on the Test Set
GCaution: Refer to accompanying notes.
FRisk of electric shock.
cEquipment complies with relevant EU Directives

Mains Input Panel
General Description
4.
The OTS60SX/2 is a lightweight, semi-automatic, oil dielectric strength test set. The
instrument is suitable for protected field use and can be powered from a range of
mains supplies. The maximum 60 kV output allows tests to be performed on oil from
a wide variety of electrical installations including transformers, circuit breakers and
other equipment. The operation of the test set is extremely simple and the results are
displayed on a bright LED display. A selection of vessels enables the instrument to be
configured for a variety of tests.
The semi automatic operation allows all types of testing to be performed. An
automatic one minute timer operates when the high voltage is paused for Withstand
(proof) testing. Oil samples can also be tested according to breakdown specification
by using a suitable sequence of tests.
The instrument is constructed in a strong, sheet steel case. Handles are provided for
ease of transportation. A pouch is located on the side of the instrument to contain
accessories such as the power cord, additional electrodes and the spacing gauge. An
optional carrying case incorporates a shoulder strap.
A number of vessels are available suitable for testing to a wide range of national
specifications. Three types of electrode are available; spherical (IEC type), mushroom
(VDE/ASTM D1816) and cylindrical (ASTM D877). The oil sample can be stirred by a
motor driven impeller available in selected vessels. The vesselis located in the top of
the instrument and covered by a transparent polycarbonate door with a mesh screen
so that the oil breakdown can be viewed. A safety interlock ensures that the high
voltage is disconnected when the chamber door is opened.
Voltage
Selector
Mains
power
input
Fuseholders

Ensure that the instrument is properly earthed. The test set must be connected to a
socket (receptacle) with a protective earth (ground) conductor.
Before connecting the instrument to the mains power supply, ensure the voltage
selector located on the mains input panel is set to the required voltage. The correct
fuse value should be fitted for the supply voltage (See Specification). The fuse holders
are located next to the supply inlet.
Power cord
If the power cord plug is not suitable for your type of socket outlets, do not use an
adaptor. You should use a suitable alternative power cord, or if necessary change the
plug by cutting the cord and fitting a suitable plug.
The colour code of the cord is:
Earth (Ground) Yellow / Green
Neutral Blue
Phase (Line) Brown
If using a fused plug, a 3 Amp fuse to BS 1362 should be fitted.
Note: A plug severed from the power cord should be destroyed, as a plug with bare
conductors is hazardous in a live socket outlet.
Oil Sampling
The relevant test specification will give advice on the best methods to use when
sampling oil. Contamination of the oil may lead to misleading results. Always run off
a small amount of oil before sampling and ensure that the flow of oil is steady.
Preparing the Oil Test Vessel
Optional vessels are available for testing to national specifications (See table and
Accessories). Some specifications require stirring of the oil sample as well as different
test electrode shapes. Once the correct vessel has been chosen for the required test
the electrode gap should be set. This is achieved by adjusting the threaded nut on
the side of the vessel. Small adjustment of the gap can be made by hand tightening
the nuts and rotating the spindle. A slot is provided on the end of the spindle for this
purpose.
A set of individual 0,5 mm feeler gauges is provided for accurate measurement of the
gap. Gauges can be combined to measure from 1 mm to 4 mm. (see page 12)
Clean the vessel in accordance with the instructions given in the relevant test
specification. Allowing space for the lid to be fitted, fill the vessel with the oil sample.
The amount of oil required will depend upon the type of lid used. Load the vessel in
the test chamber, connecting the motor power cable, if fitted, and carefully shut the
door so that the safety interlock switch operates.
Preparing the Oil Test Set
5
Operation