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Page 176

TABLE 9-1 (cont.) Troubleshooting Circuit Breakers

Condition

Possible Cause

Suggested Remedy

Sludging of oil

Overheating

| Filter or put in new oil. Locate and repair source of overheating. |

Gaskets leaking | Oil saturation or improper installation | Replace with new gaskets, properly installed.

Insulation failure

| Absorption of moisture or accumulation of dirt, grime, carbon, etc., on bushing and insulation parts |

| Thoroughly clean all insulated parts. Bake or dry out water-soaked parts, or replace them. |

| Tanks or supporting structure energized (leakage or induced voltage) |

Ground connection broken

Repair connection.

Grounding inadequate

| Add additional grounds. Bond as many structures together as practicable. |

Dirty or cracked bushings

| Clean bushing, or replace it if cracked. Check bushing for flashover and lightning protection. |

Noises due to vibration

| Loose bolts or nuts, permitting excessive vibration |

Tighten bolts or nuts.

Rust and paint deterioration

| Weather; pollution or salt contamination; overheating |

| Remove rust and deteriorated paint. Clean surfaces. Repaint with proper paints and coatings. |

Broken bushing or parts

Strain on terminal connections

| Install flexible connection between terminals and cables or busses to remove strain. |

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