Use of Resistive Voltage Dividers for Transformer Tertiary Ground Detection

Martin, Aaron; Martin, C.; Hildreth, Jeff; Antonova, Galina S.

doi:10.1109/cpre55809.2022.9776570

Cited by 1 publication

(2 citation statements)

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“…The operation of the power system and physical simulation experiments show that the third harmonic resonance is most likely to occur when the power supply is switched on to the no-load bus, and sometimes when the outlet of the substation is very short, the third harmonic resonance may also occur [8,9] . When PT is connected to Y0/Y0/Δ, the neutral point of the power supply is not grounded, so the third harmonic excitation current cannot be supplied to PT.…”

Section: Third Harmonic Resonancementioning

confidence: 99%

“…At this time, its effective value is larger than the open third harmonic potential without a capacitor; that is to say, the voltage at both ends of the inductor is greater than that without a capacitor. On the contrary, if the capacitance is large, the corresponding effect of the current is demagnetization, that is, to counteract the effect of core saturation [9].…”

Section: Third Harmonic Resonancementioning

confidence: 99%

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Study on fault waveform library of PT high voltage side fuse in hydropower station

Ren

Zhang²

2023

J. Phys.: Conf. Ser.

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In the arc-suppression coil grounding system of a medium voltage distribution network, high voltage side voltage transformer insurance fusing faults frequently occur, including fusing during startup and grid connection, fusing during operation, fusing during the shutdown, etc., which will directly affect the accuracy of measurement, metering, protection, and other secondary equipment. In this paper, we used the calculation of electromagnetic transient EMTP-ATP software, theoretical analysis of the typical hydropower station wiring and parameters of the medium voltage system, set up the improved model of neutral point grounding system, simulation of single-phase earth fault line and disappeared in the transient process, calculation of PT transient current, to verify that the way to study the mechanism of frequent fusing of fuse in the PT. Typical fault waveform databases are established under different bad working conditions (ferromagnetic resonance, low-frequency nonlinear oscillation, lightning wave invasion, etc.).

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Section: Third Harmonic Resonancementioning

confidence: 99%

Section: Third Harmonic Resonancementioning

confidence: 99%