By Steven W. Blume

Units forth the stairs had to safeguard serious telecommunications circuits from energy faults and lightning in excessive voltage environmentsThe have to safeguard telecommunications circuits from energy faults and lightning hasn't ever been larger: whilst strength outages or process disturbances ensue, trustworthy telecommunications are crucial. With this ebook as their consultant, readers will understand what they should do (and now not do) to guard serious telecommunications circuits and gear situated in excessive voltage environments reminiscent of electricity vegetation, substations, and tool towers. additionally, the booklet explains the right way to get the task performed adequately, detailing the right kind implementation of protection techniques and using protecting apparatus to put off or reduce risk.Setting the root, the booklet starts off with an outline of the matter, key matters, criteria, and safeguard issues. subsequent, it covers: Definitions and basics of electrical energy platforms, with reference to HVPT applicationsCauses, boundary stipulations, and calculations of floor power riseCritical telecommunications circuits that needs to be secure in excessive voltage environmentsProtection schemes and gear to unravel groundpotential upward thrust problemsEffective deploy and trying out of excessive voltage interface equipmentPersonal defense for telecommunications group of workers operating with gear in excessive voltage environmentsThroughout the booklet, the writer refers to approved criteria and most sensible practices. Written by way of probably the most revered specialist running shoes within the telecommunications undefined, excessive Voltage security for Telecommunications can be utilized for pro education classes or self-study. it is going to allow readers to guard severe facts and voice communications circuits from excessive voltage occasions and shield themselves in the course of apparatus set up and upkeep.

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Extra resources for High Voltage Protection for Telecommunications (IEEE Press Series on Power Engineering)

Example text

The next section discusses electrical terminology and concepts used in the electric power industry. Later chapters apply these terms frequently when explaining the reasons behind the special design, construction and maintenance methods and procedures of HVPT. AC VOLTAGE GENERATION AC voltage generation is the main source for current flow in power systems and power faults. Faulted power lines or substation equipment cause fault currents to flow back to their sources through paths such as earth returns, distribution lines’ multigrounded neutrals (MGNs), or transmission lines’ shield wires.

However, the voltage that breaks down the BIL insulation is APV. The engineer/technician has to make sure the references match or conversion factors must be used. Note that conversion factors are used when calculating GPR because fault currents that are typically provided by the power company are in rms values, but the engineer must calculate GPR in peak asymmetrical in order to determine the 300-V point in the ZOI. The 300-V point is also referenced in peak asymmetrical (this is explained in more detail later in this book).

When the neutral is continually grounded, the line is said to have an MGN. The National Electrical Safety Code Rule 092C1 requires MGN systems to be grounded at least four times per mile. System Protection Equipment and Concepts â•… 47 One can identify a wye primary configuration by the way a singlephase transformer is connected to the power line. One of the transformer bushing connections will be grounded, and the other bushing is connected to a phase conductor. Examining the transformer bushing wire connections closely helps determine if the transformer is connected line to ground or L-L.

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