Pole-mounted outdoor signal source device

Abstract

The invention provides a pole-mounted outdoor signal source device. The pole-mounted outdoor signal source device comprises a housing and an inlet wire sleeve and an outlet wire sleeve which extend out of the housing, wherein the inlet wire sleeve is connected with a line bus in a power distribution network, the outlet wire sleeve is connected with a grounding wire in the power distribution network, the housing is internally provided with a two-phase contactor, a resistor connected with the contactor and a current transformer sleeving the outlet wire sleeve, and after the power distribution network generates a single-phase grounding fault, the contactor with a grounding phase is closed and forms a loop with the resistor and the outlet wire sleeve. The pole-mounted outdoor signal source device provided by the invention has the following advantages: a principle of detecting signals through signal injection is adopted, the method provided by the invention is the only method not affected by a system operation mode, a topology structure, a neutral point grounding mode, a fault random factor and the like, a threshold value does not have to be set for a fault indicator, and after the single-phase grounding fault occurs, the signals are automatically sent for detecting the single-phase grounding fault.

Description

technical field [0001] The invention relates to an outdoor signal source device on a pole. Background technique [0002] my country's distribution lines are complex, and most of the transmission lines are overhead transmission lines, especially in mountainous areas, where overhead transmission lines are exposed to the atmosphere and have a considerable height. In harsh climates (rain, snow, fog, thunder) and other environments, insulation damage is very likely to occur, resulting in single-phase grounding and other faults, and due to long overhead lines, high distances from the ground, and harsh environments (such as passing through alpine jungles), It makes the fault concealed, and it is difficult to find the fault point quickly and accurately. Sometimes it is necessary to determine where the fault occurs by means of segmented switch-off test transmission, which is very unfavorable to the continuity and safety of line and equipment operation. [0003] Although there is a ...

AI Technical Summary

Problems solved by technology

In harsh climates (rain, snow, fog, thunder) and other environments, insulation damage is likely to occur, resulting in single-phase grounding faults, and because of the long overhead lines, high distance from the ground, and harsh environments (such as passing through alpine jungles), Makes the fault concealed, making it difficult to quickly and accurately find the fault point

Sometimes it is necessary to determine where the fault occurs by switching the switch in sections and testing power transmission, which is very detrimental to the continuity and safety of the line and equipment operation

[0003] Although there are currently fault indicators hung on the cables to identify faults with overhead remote signaling terminals, their detection principles are passive detection, relying on changes in distribution network parameters before and after a single-phase ground fault occurs

However, the ground fault signal generated by the grounding system itself is weak. When it is polluted by electromagnetic interference and harmonics, the signal will be distorted, affecting the selectivity and accuracy of the fault indicator, and losing the accuracy of implementation in time work.

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