Transmission line single-phase adaptive reclosing implementing method based on fault point voltage

A technology of fault point voltage and transmission lines, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as misjudgment, small recovery voltage of fault phase, misjudgment of voltage criterion, etc., to avoid damage, ensure stability and Reliability and wide-ranging effects
CN101359822AInactive Publication Date: 2009-02-04TIANJIN UNIV
0 Cites 42 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2009-02-04
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

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

Abstract

The invention belongs to electric power system transmission line relay protection field and relates to a method for judging failure property of single-phase self-adapting reclosing based on fault point voltage: real-timely acquiring the voltage and current value of every phase on one side of the transmission line; measuring failure distance; real-timely computing the current actual fault point voltage; finding out the sound phase current and fault phase voltage at the two ends of the line, then finding out the approximate open circuit voltage of the fault point and the set-pressure using the result of sound phase current and fault phase voltage and the result of failure distance measurement; comparing the fault point voltage with the set-pressure, an instantaneous failure is judged if the fault point voltage value is persistently larger than the set-pressure within the set time period after single phase tripping, and the protection sends out a reclosing order after certain time delay; an permanent failure is judged if the fault point voltage value is always smaller than the set-pressure within the set time period, and the protection will not reclose after tripping off the three phase line. The invention can ensure the persistency and stability of system power supply and avoid the damage by single phase reclosing and permanent failure to electric equipment.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of relay protection of power system transmission lines, and in particular relates to a method for realizing automatic reclosing of power system transmission lines. Background technique

[0002] Most of the faults on high-voltage overhead lines are instantaneous, and the normal operation of the system can be restored by reconnecting the line after the arc is extinguished at the fault point. Therefore, in order to ensure the continuous and stable power supply of the power system, automatic reclosing technology widely used. However, the automatic reclosing devices currently in practical use blindly reclose after the circuit breaker trips, and cannot judge transient faults and permanent faults. Once a permanent fault occurs, not only cannot the normal power supply of the system be restored, but the secondary impact on the electrical equipment caused by the reclosed fault will exceed the damage caused by a short circuit u...

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