Operation; Warnings; Precautions; Figure - Megger OTS 60PB Guide De L'utilisateur

Operation

Warnings – read and apply the safety warnings on page 1.
1. Ensure that the battery charger is properly earthed before use. The battery charger should only be
connected to a socket outlet with a functional earth conductor.
2. The battery charger must only be used with a proprietary mains plug and the supply protected using
isolation by disconnection devices, i.e. fuses and/or circuit breakers. A fuse or circuit breaker up to
a maximum of 5 A should be used. The charger must not be used when damaged, immersed or with
rain falling on it.
3. The OTS 60PB must only be used to test electrical grades of insulating oils. Other flammable
materials such as petrol must not be tested.
4. Ensure that the test chamber and door tray are always scrupulously clean, particularly prior to a test.
Wipe away any spilled oil in the test chamber or on the test vessel when necessary.
5. Ensure the test electrodes and surroundings are scrupulously clean before a test. Ensure the
electrodes are free from pitting.
6. The test set is fitted with high breaking capacity ceramic fuses to IEC 127/1. It is essential that any
replacement fuses fitted to the test set conform to this specification (for full details see the
Specification section). Glass fuses MUST NOT be used due to their low rupturing capacity.
7. Only the correct oil test vessels must be used. These are supplied by Megger Limited and the
reference part number is given in the Accessories section. A test vessel must always be present
when operating the test set.
8. When setting the electrode gap or spacing always de-energize the oil test set using the switch
located on the rear of the instrument.
9. Casing panels or other parts must not be removed. To do so may expose live parts of the circuit.
Adjustment or repair must only be carried out by a qualified instrument technician who is aware of
and takes precautions from the hazards involved while working on high voltage equipment.
Capacitors inside the test set may still be charged even if the apparatus has been disconnected from
the supply especially under fault conditions.
Any warranty covering the test set will be invalidated unless the work is carried out by the
manufacturer or one of his approved agents.
10. Whenever it is likely that the test set's protection has been impaired, it must not be used but rather
taken out of service and returned to the manufacturer or his approved agent for repair.
The protection is likely to be impaired if, for example, the test set shows visible signs of damage; for
example to the membrane switches and viewing areas; fails to perform the intended measurements;
has been subjected to prolonged storage under unfavourable conditions or has been subjected to
severe transport stresses.
11. If the oil test set has been exposed to extreme changes in humidity or temperature it must be allowed
to acclimatise to its new conditions for a period of not less than 2 hours before use.
12. It is inadvisable to transport the test set with a full vessel fitted in the test chamber.

Precautions

The internal battery should be re-charged at least every 6 months to prolong its working life.
The test set's circuit contains static sensitive devices. Care must be exercised in handling the printed circuit
boards. This should be done in accordance with DEF STAN 59-98 and BS 5783 specifications for handling
electrostatic sensitive devices. Any unauthorized prior repair or adjustment will automatically invalidate the
Warranty covering the test set.
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