Parallel connection method and parallel connection device for multiple local discharge signals

Abstract

The invention discloses a parallel connection method and a parallel connection device for multiple local discharge signals. The parallel connection method comprises the following steps: receiving signals input by multiple local discharge sensors, and preprocessing the local discharge sensors to obtain amplifying signals; isolating on the amplifying signals to enable the signals to be unidirectionally transmitted in a self-triggering manner, and finally, outputting all the isolated signals, wherein the delay transmission of ultrahigh-frequency local discharge signals is realized by adopting a surface acoustic wave delay line set. According to the parallel connection method and the parallel connection device disclosed by the invention, by amplifying and isolating the multiple signals, the signals can be unidirectionally transmitted in a self-triggering manner and isolated, further, the non-interfering parallel connection of the multiple local discharge signals is realized, and the signal loss during a signal transmission process is further avoided. Meanwhile, the local discharge detection signals connected in parallel are sent to a signal bus, and the multiple signals are monitored simultaneously by a data acquisition unit, and therefore, the goal that data acquisition is performed through the same set of data acquisition units is achieved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of signal control, in particular to a method and device for parallel connection of multiple partial discharge signals. Background technique [0002] In partial discharge signal detection, multiple channels of UHF pulse signals are connected in parallel to one transmission bus for transmission. At the interface where any channel is merged into the transmission bus, it is necessary to realize the transmission of the channel’s merged signal to the transmission bus. At the same time, there is no Losslessly isolate the transmission of other signals on the transmission bus to the transmission line. [0003] In the prior art, the following two schemes (Scheme A, Scheme B) are usually adopted to realize signal isolation and self-triggering switch: [0004] Option A: circulator. Such as figure 1 As shown, in the circulator, the signal can only go along the first port 1 → the second port 2, the second port 2 → the ...

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Problems solved by technology

[0005] The disadvantage of scheme A is that the circulator isolates the reverse signal by absorbing signal energy. For non-selective transmission signals in multiple transmission signals, that is, other UHF signals transmitted from parallel connection branches in the signal bus , it will produce a large amount of signal energy attenuation when passing through the signal isolation circuit in the unidirectional transmission circuit based on the circulator, resulting in signal loss, and the signal energy is attenuated by 50%

[0007] The disadvantage of scheme B is: the general switch circuit cannot realize the self-triggering closing and turning off of the signal to control the switch, so it cannot realize self-triggering one-way transmission

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