Maintenance aims to maintain the efficiency, reliability, and economic lives. During its development, maintenance carried out as follows:
1. Maintenance routine when there is interference or damage. This method can still be used to tools that are not essential role in the operation.
2. Periodic maintenance. Maintenance is done by a certain time period based on statistical manual mill or statistical damage or disruption.
3. Predictive Maintenance (predictive maintenance).
This method is now being developed. How this is done is based on observations of some of the data and then do an analysis of this data needs to be done to determine when an inspection or maintenance. tool. The data used for predictive maintenance analysis is:
a. Insulation resistance.
b. Shaft vibration.
c. Coil temperature and the temperature of the bearing.
d. The content of impurities (impurities) in the insulating oil (transformer oil, oil PMT).
e. Observations with infrared light.
f. The observation of the ultraviolet rays that can detect the presence of impurities, and partial discharge.
g. Especially for the maintenance of the transformer required ptediktif additional observations
Currently being developed various “self-diagnostic” program that is widely used for predictive maintenance. Part Installation Must be maintained, Installation parts must be maintained so that the continuity of power supply, ie generators, electric motors, transformers, circuit breaker, storage battery, to earth, and protection systems.
a) Generator.
Generators that do not have a closed cooling system got a lot of dust on the stator and rotor insulation. Moreover, when the environment is wet, the insulation can quickly fall arrest, especially if the generator so it does not happen often stop heating.
To that end, the stator and rotor insulation needs to be measured and if it is too low, it is necessary to purge isolation. Generators are cooling with air, or hydrogen gas but is covered through a heat exchanger, in addition to insulating the stator and rotor are measured prisoners, also the air temperature or the temperature of the hydrogen gas needs to be measured and the heat exchanger needs to be cleaned.
b) electric motor.
The problem is the same as the generator with air cooling. open circuit.
c) Transformer.
Besides insulating oil soiling coil also needs to be examined as well as the water content and acid content.
d) The breaker and switches.
The quality of the insulation media needs to be checked, if necessary, the insulation medium supplemented or replaced. In addition to the ignition needs to be checked if still no movement in unison and whether the contact was broken.
e) Battery battery.
Voltage of each cell needs to be examined to determine whether there are damaged cells, if necessary replacement. Quality electrolyte also need to be checked, if necessary, the addition or replacement.
f) All of the contact line.
Contact the connection of all parts of the electrical installation of the equipment needs to be examined include the above as the contact line is a weakness of the electrical installation. Checks can be made with infrared light.
g) grounding point.
All grounding point in the electrical installation should be maintained so that the prisoner does not exceed 4 ohms. It is necessary for the safety of the people in the surrounding electrical installations.
h) protection system.
Protection systems, in particular relays, need to be checked and maintained in order to function correctly.
i) The electrical connection.