page_56

< previous page | page_56 | next page >

Page 56

| 4 Operation and Maintenance |

| Because there are no moving parts, permitting simple and durable rugged construction, the transformer requires little attention in the way of operation and maintenance. Prudence, however, requires that certain steps be taken to insure failure-free operation, including the operation of its auxiliary accessory equipment. |

| The most important consideration in transformer operation is the prevention of overheating. Overheating may result from the loads served by the transformer, from poor ventilation, from failure of cooling systems, and from incipient faults (progressive failure of the insulation) within the transformer. |

| Heat Indicators |

| Devices are incorporated in some transformers to give automatic indication of excessive heating. In the small, self-protected distribution transformer, heat sensitive device turns on a small red light located on the transformer. In larger units, a hot-spot indicator is installed in the insulation at a point where maximum temperatures may be expected. The indication of this condition may be located at the transformer itself, or at some remote monitoring location. Smaller units may be monitored by special crayon marks on the case which change color with heat; others will have receptacles into which are placed small vials of waxes which melt at different temperatures. They will be observed during routine inspections. |

< previous page | page_56 | next page >