Device and method for suppressing resonance 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: 2020-04-21
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology
[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, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
[0034] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.
[0035] see figure 1 , which shows a schematic structural diagram of the resonant overvoltage suppression device provided by the embodiment of the invention, which is described in detail as follows:
[0036] The device for suppressing resonance overvoltage provided in ...
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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 resonance overvoltage suppressing device and method. Background technique [0002] For the electromagnetic voltage transformer, its main component is the iron core inductance element. When there is a large disturbance, the nonlinear iron core of the voltage transformer may be saturated, making the connection between the equipment and the line and the equipment ground Capacitors form a single-phase or three-phase resonant circuit, resulting in ferromagnetic resonance overvoltage. The ferromagnetic resonance overvoltage has great harm, which can cause accidents such as the blown primary fuse of the voltage transformer and the explosion of the current limiting resistor, which seriously affects the safe operation of the power grid. [0003] The methods used in the prior art to prevent ferromagnetic resonance often have some defects. For example, the method ...
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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