SU504986A1

SU504986A1 - Induction method of finding places of closure to the sheath of underground cables

Info

Publication number: SU504986A1
Application number: SU1972648A
Authority: SU
Inventors: Олег Александрович Дроздов
Original assignee: Новочеркасский Ордена Трудового Красного Знамени Политехнический Институт Им.С.Оржоникидзе
Priority date: 1973-11-30
Filing date: 1973-11-30
Publication date: 1976-02-28

Description

33

т. е. по поврежденной жиле проходит лишь 2/3 одиночного тока в положительном направлении . По неповрежденным жилам в противоположную сторону течет также ток 2/3/1, который компенсирует действие одиночного тока в поврежденной жиле. Кроме того, токи неповрежденных нужд l/3/i+1/3/1-2/3/1 совместно с током поврежденной жил 2/3/1 образуют пару токов, направл ющихс в разные стороны, что показано на фиг. 2. Таким образом , Б схеме одиночный ток превращаетс в пару ТОКО.В до места повреждени и полностью компенсируетс за местом повреждени . Подбор необходимого числа витков первичной обмотки трансформатора 2 проводитс оператором с помощью обычного индукционного прибора. При этом оператор должен добитьс отсутстви одиночного тока в начале кабел . Контроль компенсации можно проконтролировать с помощью чувствительного вольтметра 4, реагирующего на напр жени звуковой частоты. При указанной компенсации сумма токов жил равна току в оболочке, что также контролируетс перед отысканием. На трассе кабел оператор фиксирует максимумы напр женности пол пары токов при перемещении кабелеискател и локализует место повреждени по исчезновению последней .i.e. only 2/3 of the single current passes through the damaged core in the positive direction. A current of 2/3/1 flows in the opposite direction along intact veins, which compensates for the action of a single current in a damaged core. In addition, the intact needs currents l / 3 / i + 1/3 / 1-2 / 3/1, together with the current of the damaged core 2/3/1, form a pair of currents directed in different directions, as shown in FIG. 2. Thus, in the B scheme, a single current is converted into a TOK pair. B to the fault location and is fully compensated for behind the fault location. The selection of the required number of turns of the primary winding of the transformer 2 is carried out by the operator using a conventional induction device. In this case, the operator must achieve the absence of a single current at the beginning of the cable. Compensation monitoring can be monitored using a sensitive voltmeter 4 that responds to audio voltage. With this compensation, the sum of the core currents is equal to the current in the sheath, which is also controlled before the search. On the cable route, the operator fixes the maximum intensity of the floor of a pair of currents when the detector cable is moved and locates the damage site by the disappearance of the latter.

Claims

Invention Formula

The induction method of finding the places of closures on the sheath of underground cables, in which the noise is reduced by not connecting the damaged core to the clamp of the Audio Frequency generator, and the intact cores through the inductive compensator to the second clamp of the said generator and the damage place is determined by the disappearance of the useful signal above the cable line using a cable detector, characterized in that, in order to improve the accuracy of finding the defect location, two trays are used as said inductive compensator. The transformer, which is connected at different ends of the cable, while at the far end of the cable connect the primary winding of the transformer to the intact conductors and sheath, and the secondary, having double the number of turns, to the damaged core and the sheath, and at the near end of the cable the secondary winding of the transformer is connected between the damaged and the adjustable primary winding are connected to the generator and the cable jacket and compensate for the interference by adjusting the transformation ratio of the last transformer atorov.

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FIG.

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