SU886263A1

SU886263A1 - Device for protecting two-cable communication line

Info

Publication number: SU886263A1
Application number: SU802897530A
Authority: SU
Inventors: Эдуард Львович Портнов; Леонид Давыдович Разумов; Семен Александрович Саксонов
Original assignee: Предприятие П/Я Р-6609; Московский Ордена Трудового Красного Знамени Электротехнический Институт Связи
Priority date: 1980-03-19
Filing date: 1980-03-19
Publication date: 1981-11-30

Description

(54) УСТРрЙСТБО ЗАЩИТЫ ДВУХКАБЕПЬНОЙ ЛИНИИ СВЯЗИ(54) DEVELOPMENT OF PROTECTION OF TWO-TERM LINE OF COMMUNICATION

Изобретение относитс к эпектротех- нике Н может использоватьс при прокладке двухкабельных магистралей св зи вблизи линий высокого напр жени The invention relates to a process engineer H can be used when laying two-cable communication lines near high voltage lines.

Известно устройство защиты двухкабельной пинии св зи, содержащее редукционный трансформатор, перва обмотка которого соединена последовательно с изопированными друг от друга оболочками первого кабел , а втора обмотка редукционного трансформатора соединена последовательно с жилами первого кабел l .A device for protection of a two-cable line is known, which contains a reducing transformer, the first winding of which is connected in series with the sheaths of the first cable that are isolated from each other, and the second winding of the reducing transformer is connected in series with the conductors of the first cable l.

Однако известное устройство не обеспечивает достаточной защищенности линии св зи от вли ни внешних источников .However, the known device does not provide sufficient security of the communication line from the influence of external sources.

Цель изобретени - повышение fsaпшщенности от внешних источников.The purpose of the invention is to increase the fs of the external sources.

Поставленна цель достигаетс тем, что редукционный трансформатор выполнен на Ш-образном сердечнике, причем изолированные друг от друга оболочки второго кабел соединены с первой об-The goal is achieved by the fact that the reduction transformer is made on the W-shaped core, and the sheaths of the second cable insulated from each other are connected to the first

моткой редукционного трансформатора, расположенной на центральном магнитопроводе редукционного трансформатора а дополнительна обмотка редукционного трансформатора соединена последовательно с жилами второго кабел . При этом редукционные трансформа- торы Ьключены в линию св зи с интервалом , определ емым из соотношени a coil of a reducing transformer located on the central magnetic circuit of the reducing transformer and the additional winding of the reducing transformer are connected in series with the cores of the second cable. At the same time, the reduction transformers b are connected to the communication line with an interval determined from the ratio

10ten

eiei

РТRT

О .ABOUT .

.и.and

0505

шгshg

1515

где t - длина защищаемиги y aoiAawhere t is the length of the protected y aoiAa

кабел ;cable;

S - требуемый коэффициент защитного действи ;S is the required protective effect factor;

HQJ . - активное сопротивление цепи Hqj - active resistance of the circuit

20 оболочка - земл на длине Е ; ЬОБ индуктивность оболочки кабел 20 shell - earth on the length E; BOB cable inductance

Claims

ny length; (and is the frequency of the transmitted signals; 3 the inductance of the primary (second and third) windings of a reducing transformer. In the drawing, a section of the proposed device is schematically represented. The device contains the first 1 and second 2 cables with shells 3 and 4 and conductors 5 and 6, respectively, Reduction transformer 7 with the first 8, second 9 and additional 1O windings. The protection device of the two-cable line works as follows. When high voltages appear, a current flows through the metal shells 3 and 4 and the current flows tear the winding 8. As a result, in the second 9 and additional 10 windings, a voltage is induced which erases the induced voltage twice in the conductors 5 and 6 of cables 1 and 2, as a result of which it decreases to acceptable limits, And the interval d (allows include two times less reduction transformers 7 on two cable lines, while the device is connected to each line separately. In case of damage to the sheath 3 or 4 of one of the cables 1 and 2, the wires 5 and 6 of the damaged cable are protected from dangerous zheniy. The application of the proposed device allows to reduce the cost of manufacturing the reduction transformer and the protection of the two-cable trunk and to increase the effect of the protection of the cable main. Claim 1. The protection device of a two-cable communication line containing a short-circuit transformer, the first winding of which is connected in series with each other insulated by the sheaths of the first cable, and the second winding of the reduction transformer connected in series with the conductors of the first cable, different in that for the purpose of turning protection from external sources, the reducing transformer is made on the W-shaped core, the sheaths of the second cable being insulated from each other are connected to the first a coil of a reducing transformer located on the central magnetic circuit of the reducing transformer, and an additional winding of the reducing transformer is connected in series with the cores of the second cable.

2. The device according to claim 1, 1 and 2 tons, which is that the reduction transformers are connected to the communication line with an interval determined from the relation where E is the length of the cable section to be protected; S is the required protective effect factor; and 55.3 active resistance of the sheath circuit - earth on the length; B (s5 is the inductance of the cable sheath on the length; the frequency of the transmitted signals j is the inductance of the primary (second and third) windings of the reduction transformer; Sources of information taken into account during the examination 1. German patent number 1113488, class 2.tc 4/12, 1963 (prototype).