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The transformer is always connected to the primary distribution lines through protective fuses and disconnect switches. For pole-mounted transformers, this is usually a ' fused cutout .' An electrical fault melts the fuse, and the device drops open to give a visual indication of trouble.
In electrical distribution, a fuse cutout or cut-out fuse (often referred to as a cutout) is a combination of a fuse and a switch, used in primary overhead feeder lines and taps to protect distribution transformers from current surges and overloads. An overcurrent caused by a fault in the transformer or customer circuit will cause the fuse to ...
Rural distribution is mostly above ground with utility poles, and suburban distribution is a mix. [1] Closer to the customer, a distribution transformer steps the primary distribution power down to a low-voltage secondary circuit, usually 120/240 V in the US for residential customers.
A network protector is a type of electric protective device used in electricity distribution systems. The network protector automatically disconnect its associated distribution transformer from the secondary network when the power starts flowing in reverse direction.
It includes in one unit two switches that can connect the load to either or both main conductors, and a fusible switch or circuit breaker and switch that feed a distribution transformer. [1] The metal enclosed unit connects to the transformer either through a bus throat of standardized dimensions, or else through cables and is usually installed ...
This is typical of long rural lines with isolated load areas. In general, the radial distribution network has more power failures than the interconnected distribution networks. In a secondary network the transformers are distributed across an area (e.g. in streets) and have multiple supplies. The transformers are wired together on the secondary ...
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