1- Transformer preventive maintenance checklist:

Transformer is a costly electrical static device which is used for voltage transformation als low to high and high to low. Preventive maintenance is a important activity for keeping healthy of transformer. Many type maintenance activity is carried out as monthly, quarterly, half yearly and yearly.
These all activities is carried out according maintenance checklist which is written step by step maintenance process.

2-Format or template of TR PPM checklist:

3 - Types of transformer maintenance checklist:

• Monthly
• Quarterly
• Half Yearly
• Annually or Yearly

4-Details of safety guideline for TR PPM activity:

During PPM activity we should follow safety guideline for stopping any misshaping. Safety related some points below mentioned.

• Isolate electrical energy source from HT panel.
• Use lock out and tag out on the HT panel transformer feeder output source.
• Use insulated tools.
• Use personal protective equipment as safety shoes, helmet etc.
• After completion activity remove tools and tackles.
• After completion remove safety lock and signboard or tag.

5-Transformer maintenance activity checkpoints:

• Ensure no leakage current is present in the transformer after discharging.
• Change silica gel from breather.
• Check buchholz relay alarm and trip setting.
• Check buchholz relay alarm and trip setting.
• Check and adjust winding temp alarm and trip setting.
• Check and adjust oil temp alarm and trip setting.
• Check and adjust oil temp alarm and trip setting.
• Check any crack in transformer bushing.
• Check any overheating sign on input and output cable terminals.
• Check abnormal sound in transformer body.
• Check poor contacts of terminals at the tap changer of the winding.

Parameters status :

After carried out maintenance activity we should check parameters for equipment better health.

• Incoming Voltage
• Check load according capacity.
• Check parameters according default limit.
• Check any abnormal sound.

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