Oil type Transformer Maintenance in industries

    

What Is a Transformer?

•     A transformer is an electrical device that transfers electrical energy from one circuit to another by electromagnetic induction.

•     Heart of every industry

•     Costly equipment

•     Highly dangerous

    List of equipment in Oil Type Transformer?

• Laminated core
• Windings
• Insulating materials
• Transformer oil
• Tap changer
• Main Tank & Oil Conservator
• Breather
• Cooling tubes
• Buchholz Relay
• Explosion vent
• Pressure Release Device 

     Before Installation of the transformer:

    The dielectric strength of the transformer oil and its chemical composition.

    Resistance of the winding to direct current and winding insulation resistance

    Primary & Secondary side breakers and relay protection are tested.

Condition for Transformer Paralleling

    Identical phase Sequence

    Equal transformer ratios

    Equal impedance voltage

    Power ratio below 3:1

What is Transformer's Safety Equipments?

    1. Buchholz (Gas) Relay

    2. Pressure Relay

    3. Oil Level Monitor Device

    4. Winding Thermometer

Transformer Fault

    Short Circuit winding

    Insulation breakdown

    Mechanical damage

    Electrical Failure

v  Line Surges

v  Voltage Spikes

v  Line faults

v  Earth fault

Safety Precaution before Transformer Maintenance

        1.    Taking parameters before shutdown

        2.    Switch off outgoing/incoming feeders

        3.    Switch off control circuit

        4.    Apply LOTO

        5.    Discharge stored Energy on both side

        6.    Short connected with ground

        7.    Check  winding & oil temp before starting Maintenance activity 

Oil Transformer Maintenance Plan