Online monitoring method of pulse injection type line oscillation

A technology of line galloping and pulse injection, applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of high cost of online monitoring and susceptibility to electromagnetic interference, and achieve simple on-site implementation, low implementation cost, and engineering Practical effect

Active Publication Date: 2011-05-25
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] In order to solve the above-mentioned problems of high cost of on-line monitoring in the prior art and being susceptible to electromagnetic interference, the present invention provides a pulse injection type line galloping on-line monitoring method

Method used

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  • Online monitoring method of pulse injection type line oscillation
  • Online monitoring method of pulse injection type line oscillation
  • Online monitoring method of pulse injection type line oscillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Such as Figure 4 As shown, the voltage waveform of the entire line when the line gallops between towers 1#-2# in the embodiment of the present invention. At this time, the whole line only dances between towers 1#-2#, so as to simulate the galloping of the lines between towers at the near end of the ultra-high voltage transmission line; since the line between towers 1#-2# is the closest to the pulse transmitter , so it can be seen on the waveform diagram that the near-end voltage waveform generated by the pulse increases compared with that at rest.

Embodiment 2

[0055] Such as Figure 5 As shown, the voltage waveform of the entire line when the line gallops between towers 2#-3# according to the embodiment of the present invention. At this time, the whole line only dances between towers 2#-3#, so as to simulate the dancing situation of the lines between towers at the middle end of the ultra-high voltage transmission line; because the line distance between towers 2#-3# is in the middle of the pulse transmitter , so it can be seen on the waveform diagram that the middle-end voltage waveform generated by the pulse increases compared with that at rest.

Embodiment 3

[0057] Such as Figure 6 As shown, the voltage waveform of the entire line when the line gallops between towers 3#-4# according to the embodiment of the present invention. At this time, the entire line only has dancing between towers 3#-4#, so as to simulate the dancing situation of the lines between the poles and towers at the far end of the ultra-high voltage transmission line; Therefore, it can be seen from the waveform diagram that the remote voltage waveform generated by the pulse increases compared with that at rest.

[0058] Compared with the traditional research method, the pulse injection type line galloping online monitoring method of the present invention has the following characteristics:

[0059] On-site implementation is relatively simple, only need to use high-frequency pulse source, plus some signal acquisition, maintenance, amplification, analysis and processing circuits can be realized; the engineering practice is stronger, and there is no need to consider t...

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Abstract

The invention discloses an online monitoring method of pulse injection type line oscillation, which belongs to the field of online monitoring of overhead transmission lines of an electric system, and relates to a pulse injection-based research method for the online monitoring of the overhead transmission lines of the electric system. The method mainly comprises the following steps of: injecting a 10ns pulse signal from the tail end of a capacitive voltage transformer; transmitting the pulse signal on an extra-high voltage line, wherein when the line generates low-frequency oscillation along with wind, the capacitance of the line is changed, then the wave impedance is changed to make the pulse signal along the line generate corresponding fluctuations; and according to the signal fluctuations, judging the position of the line oscillation, the oscillation frequency, the oscillation amplitude value and the like. The research method is relatively novel, is reasonable in design, is easy to implement, and has wide popularization and research values in the field of the online monitoring of the overhead transmission lines of the electric system.

Description

technical field [0001] The present invention relates to the monitoring of transmission lines. Specifically, the present invention relates to a method for monitoring galloping of overhead transmission lines in power systems, and more particularly to an online monitoring method for galloping of lines based on pulse injection. Background technique [0002] Conductor galloping is one of the important factors that threaten the safe operation of transmission lines. When the wind in the horizontal direction blows to the wire with a non-circular cross-section due to ice coating, a certain amount of aerodynamic force will be generated, which will induce the wire to produce a low frequency (0.1 ~ 3Hz), large amplitude (about 5 times the diameter of the wire) ~300 times, up to 10m or more) self-excited vibration, that is galloping, this kind of galloping has caused serious harm to the safe operation of the transmission line, for example, it will cause frequent tripping of the line, pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/06G01R31/08
Inventor 李传毅罗小山徐良冷超殷志良刘文辉尹毅王俏华
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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