Annual 132kV/33kV Inspection Report - duplicate

1. General periodic inspection

1.2. Thermographic Inspection of the installation

1.3. Cleaning protection and control buildings

1.4. General Visual inspection of access and perimeter compound.

1.5. Inspection of state of oxidation and general painting of equipment.

2. Current and voltage transformers maintenance

2.1. Inspection of primary and secondary earth connections

2.2. Thermographic general inspection of transformer

3. Power & auxiliary transformers maintenance

3.1 Inspection of local temperatures, earthing connections, bushing, abnormal sounds

3.2 Inspection of general oil level and filters

3.3 Visual Inspection of general equipment (Buchholz, oil level, thermal image)

3.4 Thermographic analysis of Bushings connections, auxiliary tanks, Silica-gel breathings, etc.

3.5 Chromatographic analysis of gases dissolved in oil

3.6 Physico-chemical analysis of the oil

3.7 Furan Analysis

3.8 Oil Dielectric

3.9 Replacement of Silica Gel and Oil filter

3.10 Operational test and indication check

3.11 Oil level inspection Auxiliary Transformer

3.12 Inspection of Silica Gel Auxiliary Transformer

3.13 Chromatographic analysis of gases dissolved in oil Auxiliary Transformer

3.14 Physico-chemical analysis of the oil Auxiliary Transformer

3.15 Oil Dielectric Auxiliary Transformer

3.16 General Inspection Auxiliary Transformer

4 Disconnectors and motor controls maintenance

4.1. Inspection of earthing connections, number of<br>operations and status indicator

4.2. Inspection of Auxiliary Switches, local and remote signalling

4.3. Electrical and mechanical operative test

4.4. On load Thermographic inspection

4.5. Heaters inspections

5. Circuit Breakers and switchgears cabins maintenance

5.1. Inspection of earthing connections, number of<br>operations and status indicator

5.2. Inspection vents entries, heating and ventilation

5.3. Electrical and mechanical operative test

6. Additional Checks

Test transformer fans 6 monthly inspections

To run 132-33KV Transformer Auxiliary cooling up to<br>confirm correct operation

Test heating working correct within Auxiliary control<br>cabinet and Tap Changer control cabinet

Check SF6 Gas pressure on switchgear at intake

Check Dehumidifiers / Air condition /Heating / pumps<br>within the Substation

Check and record any recent protection operations and<br>reset relays

Visual inspection of 132kV Lines/Apparatus/disconnectors.

Visual inspection of compound bonding/Earthing to<br>apparatus and continuity

Oil Samples Taken Y/N

Silica Gel and Oil filter condition

Operational test