Selection method of ferromagnetic resonance control measures
A technology of ferromagnetic resonance and measures, applied in the direction of electrical components, emergency protection circuit devices, etc., can solve the problem of insufficient damping of the resonant circuit, failure of resonance elimination, difficulty in distinguishing power frequency resonance, and semi-insulated electromagnetic voltage transformer tail insulation strike wear and other problems, to avoid the effect of breakdown of the tail insulation
Active Publication Date: 2018-10-16
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
[0004] However, in terms of the selection of prevention and control measures for ferromagnetic resonance, a differentiated prevention and control plan was not proposed according to the specific conditions on site, resulting in the main problems of (1) the installation of a resonance eliminator at the primary center point of the electromagnetic voltage transformer In this way, the voltage at the neutral point of the electromagnetic voltage transformer will increase, which will easily cause insulation breakdown at the end of the semi-insulated electromagnetic voltage transformer.
(2) Using a microcomputer secondary resonance eliminator device, it is difficult to distinguish the power frequency resonance by detecting the zero-sequence voltage and three-phase voltage waveforms, and this method is prone to the failure of resonance elimination due to insufficient damping of the resonant circuit
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[0044] The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the accompanying drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.
[0045] In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways that are different from the description again, and those skilled in the art can do similar By extension, the present invention is therefore not limited to the specific examples disclosed below.
[0046] see Figure 1 to Figure 4 , figure 1 It is a schematic flowchar...
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The invention provides a selection method of ferromagnetic resonance control measures. The method includes the steps that whether a resonance region exists in a transformer substation or not is judged; if yes, the ferromagnetic resonance control measures are selected according to the system condition of the transformer substation. Aiming at different conditions, it can be selected not to replace mutual inductors of the transformer substation or replace the mutual inductors of the transformer substation, and different control measures can be taken according to single-phase grounding or three lightning stroke conditions of the transformer substation. Different specific control measures are taken according to the three different conditions. According to the selection method of the ferromagnetic resonance control measures, the actual condition of transformer substation system equipment is fully considered, differentiated control schemes are provided according to specific conditions on site, and harmonic elimination failure caused by insufficient damping of a damping loop is avoided while tail end insulation of a semi-insulating electromagnetic voltage transformer is prevented from being broken down.
Description
technical field [0001] The present application relates to the technical field of power system safety prevention and control, and in particular to a method for selecting ferromagnetic resonance prevention and control measures. Background technique [0002] In the distribution network below 66kV and below 66kV, a non-effective grounding system is usually adopted in which the neutral point of the system is not grounded and the neutral point is grounded through a small resistance or an arc suppression coil. The system bus is connected with an electromagnetic voltage for monitoring insulation to ground. Transformer. Transient impacts caused by lightning strikes on the line, single-phase grounding, combined-air bus operation, drastic load changes, and secondary voltage-load switching may excite ferromagnetic resonance between the excitation reactance of the electromagnetic voltage transformer and the ground capacitance of the system . In recent years, frequent damage to electrom...
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IPC IPC(8): H02H7/04
Inventor 李昊刘红文王科桑前浩
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST