Device and method for suppressing resonant overvoltage
A technology of resonant overvoltage and suppression device, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Damage to small equipment, effect of preventing secondary circulation
Active Publication Date: 2018-12-11
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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[0004] In view of this, the embodiment of the present invention provides a resonance overvoltage suppressing device and method to solve the problem in the prior art that the ferromagnetic resonance will be eliminated while causing secondary circulation
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[0033] In the following description, for the purpose of illustration rather than limitation, specific details such as a specific system structure and technology are proposed for a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from obstructing the description of the present invention.
[0034] In order to illustrate the technical solution of the present invention, specific embodiments are used for description below.
[0035] See figure 1 , Shows a schematic structural diagram of a device for suppressing resonance overvoltage provided by an embodiment of the invention, and the details are as follows:
[0036] The device for suppressing resonance overvoltage provided in this e...
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The invention is applicable to the technical field of power system security, and provides a device and a method for suppressing resonant overvoltage. The device comprises a first harmonic eliminationbranch, a second harmonic elimination branch and a harmonic elimination controller. The first harmonic elimination branch is connected with the open delta end of the voltage transformer, and the second harmonic elimination branch is connected in parallel with the first harmonic elimination branch. The input end of the harmonic elimination controller is connected with the open delta end of the voltage transformer, the output signal of the harmonic elimination controller controls the working states of the first harmonic elimination branch and the second harmonic elimination branch, the device adopts the intermittent switching mode of the first harmonic elimination branch circuit to quickly control the resonant overvoltage at the first time, The resonance can be effectively eliminated by using the second harmonic elimination branch for a long time, and the ferromagnetic resonance can be effectively restrained by using the two kinds of resonant elimination branches for different time periods, and the secondary circulation current can be prevented, and the damage to the equipment can be reduced.
Description
Technical field [0001] The invention belongs to the technical field of power system safety, and in particular relates to a device and method for suppressing resonance overvoltage. Background technique [0002] For an electromagnetic voltage transformer, its main component is an iron core inductance element. When a large disturbance occurs, the nonlinear iron core of the voltage transformer may be saturated, making the equipment and the line and the equipment ground The capacitor forms a single-phase or three-phase resonant circuit, resulting in a ferromagnetic resonance overvoltage. Ferro-resonance overvoltage has a great hazard, which can cause accidents such as a fuse of a voltage transformer and explosion of a current-limiting resistor, which seriously affects the safe operation of the power grid. [0003] The methods used in the prior art to prevent the occurrence of ferromagnetic resonance often have some defects. For example, when a voltage transformer with good excitation c...
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IPC IPC(8): H02H9/00
CPCH02H9/007
Inventor 马天祥贾伯岩潘瑾段昕贾静然景皓杨桦侯磊
Owner STATE GRID HEBEI ELECTRIC POWER RES INST