Megger OTS60SX-2 Operating Manual

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

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.

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.

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.

NOTE

WEEE DIRECTIVE

Symbols used on the Test Set

G Caution: Refer to accompanying notes. F Risk of electric shock. c Equipment complies with relevant EU Directives

General Description

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

Fuseholders Mains power input

Mains Input Panel

Preparing the Oil Test Set

Operation

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.

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