This standard is vital to the application of power-line carrier systems (30-500 kHz) on all power lines. Power-line carrier systems are used for protection systems and other communications. The line trap is part of the system that allows the carrier signal to be coupled to the power line with optimal performance. Performance requirements are established so that their interaction with the power system is known and performance can be predicted.This standard applies to a line trap inserted into a power line to provide a high impedance at power-line-carrier frequencies (30-500 kHz). The purpose is to isolate the carrier signal from system impedance changes due to faults or switching behind the point of insertion, and guide the signal in the proper direction. The standard covers line traps in which the main coil is designed as a single phase, air-cooled inductor of the dry type.
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