Megger OTS60SX/2 Bedienungsanleitung

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.

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

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

Operation

Control Panel

The control panel contains the supply on/off switch, the high voltage display, voltage

ramp rate selection and the three control keys. The operation of the instrument is

very simple. When the instrument is turned on, the on/off switch is illuminated, and

the software edition code will be ﬂashed up on the display.

Breakdown Testing

The suitable ramp rate for the test to be performed should be selected using the ‘s’

key. The START key ‘ ‘ will then turn on the high voltage. The red H.V. indicator

will light to show the output voltage is on. The voltage will then increase at the

selected ramp rate and the corresponding value will be shown on the display. If oil

breakdown occurs the instrument will detect this and immediately shut off the high

voltage. The breakdown voltage value will be left on the display until the next test is

started. If no breakdown occurs, the high voltage will rise to

60 kV. At this point the test voltage is cut off and this maximum value left on the

display.

A test can be stopped at any time by pressing the STOP ‘■’button. This will remove

the high voltage from the oil sample and leave the display at 0,0 kV.

Withstand Testing

A Withstand (proof) test can be carried out by pressing the PAUSE ‘ ‘ key. This will

maintain the high voltage at the current value for one minute. After this time the

high voltage will continue to rise until one of the following:-

1) Oil breakdown occurs

2) The STOP ‘■’key is pressed

3) The output voltage reaches the maximum value of the test set.

During withstand testing the ramp rate can be changed while the pause is in

progress. This can allow the withstand test value to be accurately set by adjusting the

ramp rate to the lowest value.

Mains

on/off

switch

HV on

indicator

Ramp rate

selection

Main

controls

LED

Display

Control Panel

Warning Messages

Door Open

If the instrument overheats, the words ‘ ‘ and ‘ ‘ will be

alternately displayed and the operation disabled. This will reset automatically, when

cooled, after a few minutes.

Testing to National Standards

The OTS60SX/2 can be used to test to any international standard. A table of the

standards is given on page 10. To perform these tests it is necessary to select the

correct vessel so that the speciﬁed electrodes and suitable stirring are used. Most

standards require repetitive breakdown tests to be carried out and the average taken.

Note that sometimes the ﬁrst breakdown result is omitted from the average calculation.

If continuous stirring is not required the stirrer motor supply can be disconnected when

appropriate by opening the chamber door.

100 ml Oil Test Vessel

The D877 Low Volume Test Vessel is an optional accessory for use with the Megger®

OTS60SX/2 Oil Test Set.

The test vessel must be kept scrupulously clean. Before each use, dismantle the test

vessel, clean and dry, re-assemble, and set the electrode gap to 2,54 mm (0.100 inch).

Dismantling the vessel

1. Loosen both white locking screws.

2. Hold each electrode in turn, and unscrew, and remove the sliding arm from

each electrode.

3. Remove both electrodes from the vessel.

4. Wash hands, and clean and dry the vessel as specified in ASTM D.877.

Re-assembling the vessel

1. With clean, uncontaminated hands, place the cleaned electrodes in the

vessel.

2. Position each electrode in turn with the ﬁngers, and screw in a sliding arm

through the vessel into the each electrode in turn.

3. Centre the electrodes, and set the gap, using the appropriate gauge.

4. Ensuring that the Viton ‘O’ rings are not fouled, hand tighten both locking

screws.

Megger Limited also supply a range of automatic oil test sets. These have the

parameters of a wide range of speciﬁcations programmed into the instrument for

unattended operation.

Electrode

Viton

(Oil resistant)

‘O’ Ring

Locking

screw

Sliding arm

Fill level

The following notes should be read in conjunction with the relevant oil testing

speciﬁcations.

Causes of Bad Oil

Transformers and switchgear oil may be rendered unsuitable for further use due to

four main reasons:-

1. Low dielectric strength.

2. High acidity.

3. High sludge content.

4. Excessive free water content.

Low dielectric strength may result from many causes, the most common of which

is foreign particles or fibres and water in combination. Individually their effect may

be relatively small, but together a contamination of only a few parts in a million can

cause considerable lowering of the breakdown voltage of the oil. High acidity, sludge

and free water should not be tolerated, but will not necessarily reduce the dielectric

strength below acceptable or specified levels.

Appearance of the Sample

Only an experienced person can judge the condition of an insulating oil from its

appearance, but a general guide may be obtained from the following observations:-

5. A cloudy appearance may indicate that sludge has been formed.

6. A dark yellow colour could be a sign of overheating.

7. A blackish colour often results from an arc having taken place with either

carbonisation of the oil or of the insulation within the equipment.

8. A green colour may be due to copper salts dissolving in the oil.

Cleanliness of the Apparatus

The necessity for scrupulous cleanliness in the apparatus and during the process of

sampling, cannot be over emphasised. The measurement of the dielectric strength

of the sample is as dependent on the cleanliness of the test cell and the sampling

apparatus as the condition of the oil itself.

After cleaning the apparatus, it should under no circumstances be wiped, dried or

even handled with a dusty or ﬁbrous cloth as loose dust or ﬁbres are liable to cause

contamination.

Precautions Necessary During Sampling

Since the oil taken from a drain cock will inevitably contain an excess of settled out

solid impurities, and will not necessarily be representative of the bulk of the oil, it

should be run to waste until clear.

Always run off a quantity of oil into a glass bottle or a test tube for an initial check on

the appearance of the oil. Attention to this point may prevent contamination of a clean

test vessel.

If necessary, thoroughly clean and dry the sample point using a suitable solvent. Any

cloth used should be lint free. Open the sample cock and drain to waste enough oil to

ensure that the sample cock is fully ﬂushed and the sample is representative of the bulk

of oil to be tested. This quantity will depend upon the size of the transformer or main

container. About 2 litres is usually suitable.

When sampling from a drum or supply container, the oil should ﬂow at a steady rate

into the test vessel and after being swilled around the sides it should be discarded.

Without altering the rate of ﬂow of the oil the quantity required for the test should

then be run off while taking extreme care to prevent the ingress of atmospheric dust,

cloth ﬁbres or moisture.

Do not use a syphon. In the absence of a usable sample point, use a ‘thief’.

Shield the sample from direct light until ready to be tested.

Turbulence and air bubbles should be avoided when pouring the oil. Relevant national

speciﬁcations should be observed.

Sampling and Testing Oil for Dielectric Strength

Particular care to prevent contamination is necessary when a test is to be made on a

bulk delivery tanker, and on all occasions when a high value of dielectric strength is

anticipated. The procedure suggested above should be rigorously applied.

Oil Testing Speciﬁcations

Test

speciﬁcation

AS1767

ASTM D 877

ASTM D 1816

BS 148

BS 5730a

BS 5874

CEI 344

EN 60156

IEC 156

IP 295

IJIS C 2101

KSC 2101

NFC 27-131

NFC 27-221

rOCT 6581

SABS 555

STAS 286

UNE 21

VDE 0370

Electrode

shape

A,B

Electrode

gap

2,5 mm

2,54 mm

1 or 2 mm

2,5 mm

various

2,5 mm

2,5 MM

Initial stand

time

3 min

2 min 20 s

3 min

30 min

3 min

5 min

3 min

10 min

3 min

Rate of rise

of voltage

2 kV/s

3 kV/s

0,5 kV/s

2 kV/s

3 kV/s

2 kV/s

Stir

time

1 min

continuous

1 min

continuous/none

1 min

Stand

time

1 min

2 min

1 min

Number of

tests

Withstand (proof)

5 x 2

1 x 3

Calculate

average from

test number

tests

(when testing high ﬁre point natural and synthetic esters)

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