Chapter 6 Periodic Inspection

Table 59

Periodic inspection of overhead transmission line

Items

Contents of inspection

- Metallic members of the steel tower have no damage, transformation or

Steel tower

remarkable rust.

- Bolts have no falling off, loosening or remarkable rust.

Concrete pole

- The pole has no damage or crack.

- The pole is not inclined.

- The concrete of the foundation has no damage or crack

Foundation

- The foundation is not exposed due to outflow of the earth and sand.

- The foundation is not buried due to inflow of the earth and sand.

- Condition of the ground around the foundation is not changed.

- The wire has no loosening or remarkable rust.

Stay wire

-

The strands of the wire are not snapped.

(Guy wire)

-

Condition of the ground around the foundation of the wire is not

changed.

- The grounding conductor has no damage or remarkable rust.

Grounding conductor

- The strands of the grounding conductor are not snapped.

- The grounding resistance is not deteriorated. (Refer to Article 11 in this

Guideline)

- The insulator has no damage, crack, remarkable pollution, trace of arc

Insulator

or remarkable rust.

- Unusual noise such as leak noise is not loud.

Items

Contents of inspection

- The conductors have no damage, melting, kink, remarkable vibration or

Power conductor and

corrosion.

- The strands of the conductors are not loosened or snapped.

overhead grounding

- Clearance is not shortened from live parts of the power conductor to the

conductor

body or the arm of the pole or the steel tower due to transformation of

the jumper parts or incline of the string of suspended insulators.

Linked parts attached to

- Linked parts have no damage, crack, transformation, loosening,

abrasion or remarkable rust.

insulators

- The arcing horns have no damage, melting or remarkable rust.

Guard fence

- The poles or wire net of the fence have no damage and remarkable rust.

Accessories of the

conductor

- Accessories have no damage, crack, transformation, loosening, abrasion

(Damper and spacer,

or remarkable rust.

etc.)

Warning signal and

- The warning signal has no damage or deterioration.

lamp

- The warning lamp is not damaged, nor its light bulb is not burnt out.

Item

Contents of inspection

- The cable has no oil leakage.

Cable

- The cable has no damage, expansion or transformation.

(Including

the cable offset-

- Bending condition of the cable is not abnormal.

part)

- Off-set parts is not abnormally transformed.

- Clearance from the cable to other cables is not abnormal.

Protective

board

aga

- The board has no damage or corrosion.

- Condition of the fixed board is not abnormal.

water penetrating

- The board has no water leakage.

Cable

rack,

- They have no damage, transformation or remarkable rust.

- Bolts and nuts of them are not loosened.

hardware

and insulator

for

bearing the cable

- Fixed condition and position of them are not abnormal.

- Condition of buffer material is not abnormal.

- The protective pipe has no damage, corrosion, crack or

Protective pipe

transformation.

- Bolts and nuts of them are not loosened.

Grounding conductor

- The grounding conductor has no damage or remarkable rust.

- The strands of the grounding conductor are not snapped.

Item

Contents of inspection

Protective

board against

- The board has no damage, corrosion, crack or transformation.

- Condition of fixed board is not abnormal.

small animals

- Bolts and nuts of them are not loosened.

- The sign label is not fallen off.

Sign label

- The sign label has no damage or transformation.

- Condition of fixed sign label is not abnormal.

Article 61.

The inspection item for cable terminal

The terminal

boxes of underground transmission lines shall be confirmedbyvisual inspection

Items

Contents of inspection

- The strands of the conductor connected to the terminal are not

Terminal

snapped.

(Including the attached

fla

- The terminal has no damage, crack, corrosion or transformation.

plate)

- Bolts and nuts of terminal are not loosened.

- Heat detective tapes are not fallen off, detached or discolored.

- The cover has no damage, remarkable rust or transformation.

Water protective cover

- Condition of fixed cover is not abnormal.

- The cover has no leakage of compound or oil

Insulator

and

s

- The insulators are not polluted.

- The insulators have no damage, crack or arc trace.

insulator

- The insulators have no leakage of compound or oil.

Covered part by lead

- The covered part has no oil leakage.

- The covered part has no damage, crack or transformation.

- The support hardware has no damage, transformation or

Support hardware

remarkable rust.

- Bolts and nuts of the support hardware are not loosened.

(Steel

pedestal, Cleat

a

bracket, etc.)

- Condition and position of fixed support hardware are not abnormal.

- Condition of buffer material is not abnormal.

- The box has no oil leakage.

- The box has no damage, crack, expansion, transformation or

Brunch box

remarkable rust.

- Bolts and nuts of the box are not loosened.

- Corrosion prevention tapes are not detached or discolored.

- The connector and the semi-stop valve have no defect.

Insulated tube

- The insulated tube is not polluted.

- The insulated tube has no damage or transformation.

Items

Contents of inspection

- The cable has no oil leakage.

Cable (Including the

cab

- The cable has no damage, expansion or transformation.

- Bending condition of the cable is not abnormal.

off-set part)

- Distance of the cable slipped down is not excessive.

- Phase display tapes are not detached or discolored.

- The protective pipe has no damage, corrosion, crack or

Protective pipe

transformation.

- Bolts and nuts of them are not loosened.

Grounding conductor

- The grounding conductor has no damage or remarkable rust.

- The strands of the grounding conductor are not snapped.

- The sign label is not fallen off.

Sign label

- The sign label has no damage or transformation.

- Condition of fixed sign label is not abnormal.

- The equipment is not fallen off.

Protective

equipment

- Bolts and nuts are not loosened.

protective

covering

ou

- Condition of fixed equipment is not abnormal.

sheath

- The equipment is not overheated.

- The equipment has no current leakage.

Table 62 Periodic inspection of connection box

Items

Contents of inspection

- The connection box has no leakage of compound or oil.

- The connection box has no damage, crack, expansion or

transformation.

- Covered part by lead has no defect.

Connection box

- There is no abnormal sound and overheat.

- The connector and the semi-stop valve have no defect.

- There is no contact to other objects.

- Condition of movement of the connection box is not abnormal.

- The connection box is clean.

- The cable has no oil leakage.

Cable (Including

the cab

- The cable has no damage, expansion or transformation.

off-set part)

- Bending condition of the cable is not abnormal.

- Clearance from the cable to other cables is not abnormal.

- The support hardware has no damage, transformation or

Support

hardware

remarkable rust.

insulator

for

bearing

- Bolts and nuts of the support hardware are not loosened.

cable

- Condition and position of fixed support hardware are not abnormal.

- Condition of buffer material is not abnormal.

Items

Contents of inspection

Prevention

equipment

-

The equipment has no damage or remarkable rust.

-

Condition of fixed them is not abnormal.

cable slipped down

-

Distance of the cable slipped down is not excessive.

-

Clamps have no damage or remarkable rust.

Clamp for joint (Only -oil-

Fixed condition of them is not abnormal.

filled cable)

-

Bolts and nuts are not loosened.

-

The bonding conductor has no damage or remarkable rust.

Bonding conductor

-

The strands of the bonding conductor are not snapped.

-

Condition of fixed bonding conductor is not abnormal.

Grounding conductor

-

The grounding conductor has no damage or remarkable rust.

-

The strands of the grounding conductor are not snapped.

-

The sign label is not fallen off.

Sign label

-

The sign label has no damage or transformation.

-

Condition of fixed sign label is not abnormal.

-

The equipment is not fallen off.

Protective

equipment

-

Bolts and nuts are not loosened.

protective

covering

ou -

Condition of fixed equipment is not abnormal.

sheath

-

The equipment is not overheated.

-

The equipment has no current leakage.

Table 63

Periodic inspection of oil supply system

Items

Contents of inspection

- The oil tank has no oil leakage.

Oil tank

-

The oil tank has no gas leakage.

- The oil tank has no damage or remarkable rust.

- The meters have no oil leakage.

- The meters have no gas leakage.

Oil meter and Gas meter

- The meters have no dew.

- Valve condition is not abnormal.

- Indication value is accurate.

- Insulation resistance is not abnormal.

Breather (Absorbent of th

- The box of the breather has no damage or crack.

-

Oil is not deteriorated or discolored.

humidity)

- Absorbent is not discolored.

Support hardware and

- They have no damage, transformation or remarkable rust.

- Bolts and nuts are not loosened.

Foundation

- Fixed condition and position of them are not abnormal.