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Page 173

| Figure 9-13 Sulphur hexafluoride circuit breaker gas system. |

| so that temporary fault conditions need not interrupt service unnecessarily. |

| 3. Contacts need to be aligned, adjusted, and dressed (Fig. 9-7) to insure proper connection between incoming and outgoing electrical conductors. Arcing tips, explosion chambers, and de-ion grids should be thoroughly cleaned. |

| 4. Oil, or other fluid insulation, should be checked for carbonization, sludge, or other impurities. This may be done by visual observation of color and clarity, and by electrical tests on samples. External surfaces of bushings should be cleaned and checked for cracks and breaks. Electrical tests may include resistance and power-factor checks, or by the use of a Megger. |

| 5. Mechanisms and devices associated with the breaker should be checked for tightness, rust, and other signs of deterioration; tanks should be sanded and painted when necessary, gaskets replaced, auxiliary switches and other items checked for proper operation. |

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