IEEE C93.3-2017 pdf free download.IEEE Standard Requirements for Power-Line Carrier Line Traps (30 kHz to 500 kHz).
rated inductance ( LR ): The minimum value of true inductance determined at 100 kHz. rated short-time current ( IKv ): The rms symmetrical value of current that a line trap is capable of carrying for two seconds without exceeding a specified temperature. resistive bandwidth: The frequency range within which the resistive blocking impedance is not less than a specified amount. resistive blocking impedance ( Rg ): The resistive component of the blocking impedance over the resistive bandwidth. resonant frequency: The frequency or frequencies to which the line trap is tuned. self-capacitance (CR ): The capacitance resulting from the turn-to-turn, layer-to-layer, and terminal-to-termi- nal configuration of the main coil. self-resonant frequency: The frequency at which the combination of true inductance and self-capacitance becomes resonant. self-tuned trap: A line trap without a tuning device and for wideband operation designed such that the self- resonant frequency is in the carrier band. single-frequency line trap: A line trap that is tuned for parallel resonance at one selected carrier frequency. true inductance ( L ): The selfinductance of the main coil at a specified frequency, compensated for the ef- fects of the self-capacitance. tuning device: A passive network that, when shunt-connected to the main coil, produces a relatively high line trap impedance for one or more frequencies or frequency bands. It consists of capacitors and may include in- ductors, resistors, and auxiliary protective devices. tuning range: The portion of the carrier frequency band through which the geometric frequency (GMF) or resonant frequency may be adjusted. two-frequency line trap: A line trap that is tuned for parallel resonance at two selected carrier frequencies. wideband line trap: A line trap that provides a greater bandwidth than a single- frequency line trap for the same main coil inductance, resonant (or geometric mean) frequency, and impedance level.
5.2.4 Variation of blocking characteristics with change in ambient temperature and change in continuous current 126.96.36.199 Single- and two-frequency tuning The resonant frequency shall not vary more than a total of 2% for changes in both the ambient temperature and the continuous current within the temperature range of- 40 °C to +45。C, and from zero to rated continuous 188.8.131.52 Wide band tuning For the field-adjustable type, the geometric mean frequency shall not vary more than a total of2% for changes in both the ambient temperature and the continuous current within the temperature range of – 40 °C to +45 °C, and from zero to rated continuous current. For the factory-fixed type, the minimum blocking impedance over the bandwidth shall be maintained for changes in both the ambient temperature and the continuous current within the temperature range of – 40 °C to +45 °C, and from zero to rated continuous current. 5.2.5 Auxiliary protective device rating The“main” protective gap defined in 5.1.8, is usually for lightning or high fault currents that, in turn, develop high voltages across the entire inductive coil of the line trap. This is typically referred to in line-trap literature as the lightning protective device. Any“auxiliary”devices would typically be downstream for additional protective clamping for that particular downstream device unless the trap manufacturer decided to add additional levels of protection to back up this function. Any clamping or protective devices need to be self-restoring and auto-extinguishing of any spark activity. Auxiliary protective gaps shall neither sparkover nor continue to sparkover following transient volt- age actuation, with the power frequency voltage, V as determined in 5.1 .8. and 6.2.12 across the main coil. 5.2.6 Tuning device insulation level The insulation level for the tuning device shall be at least 30% above the value of the maximum 200 kV/ μs front-of-wave protective voltage or of the 20 kA discharge voltage of the protective device, whichever is higher.