Single-ended quantity protection method of high-voltage transmission line based on specific frequency band energy ratio

A technology of high-voltage transmission lines and specific frequency bands, applied in emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve problems such as susceptibility to noise and lightning interference, low fault component content, and unreliable reliability. Low sampling rate requirements, short action time, and easy-to-achieve effects
CN114336540APending Publication Date: 2022-04-12STATE GRID HUBEI ELECTRIC POWER COMPANY +1
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID HUBEI ELECTRIC POWER COMPANY
Publication Date
2022-04-12

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a single-ended protection method for a high-voltage transmission line based on a specific frequency band energy ratio, and the method comprises the steps: calculating the energy of specific frequency bands of an AC side and a DC side through collecting the current and voltage parameters in the specific frequency bands of the current side and the DC side; when the protection element is started, current and voltage parameters, energy of a corresponding specific frequency band and the ratio of the energy of the direct current side to the energy of the alternating current side continue to be refreshed, a blocking signal is sent to protection of the alternating current side when fault judgment is carried out on the direct current side, the fault type of the direct current side is judged, and protection of a corresponding pole trips quickly to remove the fault; when the fault judgment is located on the alternating current side, a blocking signal is sent to the direct current side protection, the fault type of the alternating current side is judged, and the corresponding protection rapidly trips to remove the fault.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a technology in the field of relay protection, in particular to a single-ended protection method for high-voltage transmission lines based on a specific frequency band energy ratio. Background technique

[0002] In recent years, the scale of the AC-DC hybrid grid has been continuously expanding, and a large number of power electronic devices have been connected to the grid, and the coupling relationship between the AC and DC systems has become closer. The mutual influence of the AC and DC systems has not been effectively resolved so far. The malfunction of the relay protection caused by the coupling of the AC side and the DC side has led to further expansion of the fault area, causing large-scale power outages in the power grid, and affecting the safety of the power grid. Stable operation. Since the construction of a large-scale AC-DC power grid in my country, protection malfunctions caused by AC-DC interactions have occurred ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More