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READ ELKIMA PROPOSALS IN ORDER NOT TO FACE ANY
PROBLEMS IN TRANSFORMER.
1- Spark-gap arrester grounding should be made separately
and be smaller than 1'.
2- Neutral grounding should be made separate and be away
from protection grounding and be smaller than.
3- Eclators and transformer body grounding together should
be smaller than 5
4- In grounding, a minimum immersed plate should be used;
bolts and connection points should constitute a good contact; and
these connections should be performed clean and free of oxidation.
Galvanised materials should be used; and copper grounding should be
preferred.
5- In transformer connections, the surfaces of brass nuts
and washers, which are going to be used in rod connections especially
that will provide low voltage conduction, should be clean and flat;
and these rod connections should be secured by tightening with a counter
nut. No iron washers should be used.
6- Transformers should be loaded in a balanced way. The
load should be distributed to phases equally. It should be controlled
with a measurement equipment in various hours of the day.
7- The heat of the transformer low voltage connections
should be controlled with colour change or with a laser thermometer,
which measures the heat remotely. Is a heat increase exists, the reasons
should be investigated and the problem should be solved.
8- The cable which goes from transformer low voltage output
to the switch should be controlled from the aspects of heat and connection.
Heat increase on connections accelerates the burning of transformers.
Especially in cable laying on poles, special attention should be paid
in order not to make corners with cables and not to harm the cable.
9- Settings and heat increase of the thermal magnetic
protective switch should be controlled and be kept in normal values.
10- In control panel, phase and ground closeness, which
may cause jumping during voltage increases, should be controlled;
if there exists any close points this should be removed. Otherwise
short circuit may occur in control panel during thunderbolts and transformer
may be damaged.
11- In Sectioner maneuver; special attention should be
paid to the point that the knifes are closed. In case one phase is
turned on, transformer and motors mat burn and the tension may appear
unbalanced since this situation will bring greater voltages to transformer.
12- The fuses that will be used in sectioners with fuse
should be chosen appropriately and well-proportioned with the load
to be absorbed. Wires in any way should not be used instead of fuses.
Fuses should be adjusted in a way that they will enter into jaws.
The arc that will occur in sectioner will harm the transformer.
13- Secondary protections should be adjusted well in transformers
of 630 kVA or greater. These secondary protections should be operative,
active; and be controlled regularly. Since discharging or finishing
of secondary protections' accumulators will remove protection completely,
accumulators should be controlled at east once a month.
14- In transformers; no changes should be made on eclator
rod settings. In case they are changed during transportation, these
settings should be adjusted in accordance with transformer maintenance
and operation instructions.
15- OPERATION AND MAINTENANCE INSTRUCTIONS FOR TRANSFORMERS
should also be read carefully just as for any other device. THESE
INSTRUCTIONS SHOULD BE OBEYED AND APPLIED.
16- The final user (subscriber) should be informed by
an authorised Electrical Engineer or its company concerning the operation
and maintenance instructions. Periodical maintenance of the system
should be performed regularly.
17- You can contact us for further information or for
the points that are not clear enough.
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