SU957291A1

SU957291A1 - Contact device

Info

Publication number: SU957291A1
Application number: SU813232363A
Authority: SU
Inventors: Валентин Иванович Абдулов; Николай Михайлович Адоньев; Владимир Васильевич Ионов; Елена Хаимовна Каплунова; Петр Львович Сагалло; Виктор Константинович Тарасов
Original assignee: Ленинградское Производственное Объединение "Электроаппарат"
Priority date: 1981-01-09
Filing date: 1981-01-09
Publication date: 1982-09-07

Description

(54) КОНТАКТНОЕ УСТРОЙСТВО(54) CONTACT DEVICE

1one

Изобретение относитс к электротехнике а именно к контактным устройствам электрических аппаратов на большие токи.The invention relates to electrical engineering, in particular, to contact devices of electrical apparatus for high currents.

Известны контакты высоковольтных выключателей , имеющих внутренние кольца со шпильками дл установки контактных пружин и колпачки дл фиксации пружин относительно шпильки и дл защиты пружин снаружи от обгорани электрической дугой 1.Known contacts of high-voltage circuit breakers have inner rings with studs for mounting the contact springs and caps for fixing the springs relative to the stud and for protecting the springs outside from being burned by an electric arc 1.

Известны также контакты, имеющие наружный корпус, в котором на резьбе установлены втулки типа колпачков с размещенными в них контактными пружинами 2.Contacts are also known that have an outer casing, in which bushings of the type of caps with contact springs 2 arranged in them are mounted on the thread.

Недостаткам известных контактов при больших токах короткого замыкани вл етс то, что вследствие механического отброса , происход щего при вхождении подвижного контакта в неподвижный, а также отброса за счет электродинамических сил, возникающих в контактном устройстве при прохождении токов короткого з мыкани , между контактными элементами образуетс электрическа дуга, что приводит к выгоранию внутренней поверхности этих элементов.The disadvantages of the known contacts at high short-circuit currents is that due to the mechanical rejection occurring when the moving contact enters the fixed one, as well as the rejection due to electrodynamic forces arising in the contact device during the passage of short-circuit currents, between the contact elements arc, which leads to fading of the inner surface of these elements.

Наиболее близким к предлагаемому по технической сущности вл етс контактное устройство электрических аппаратов, содержащее по крайней мере два контактных элемента, один из которых снабжен цилиндрической пружиной и механическим ограничением отброса этого элемента от второго контактного элемента при прохождении токов короткого замыкани . Ограничитель выполнен в виде гаек, установленных на шпильках контакта вблизи шин ножа разъединител 3.The closest to the proposed technical entity is a contact device of electrical devices, containing at least two contact elements, one of which is equipped with a cylindrical spring and a mechanical restriction of the rejection of this element from the second contact element during the passage of short-circuit currents. The limiter is made in the form of nuts mounted on the studs of the contact near the tires of the knife of the disconnector 3.

При сборке механический ограничитель необходимо навинчивать, дл чего концы шпилек должны иметь относительно большую длину резьбы..В св зи с тем, что ограничитель расположен на шпильке внутри контактной пружины, диаметр ее необходимо увеличивать, что приводит к увеличению диаметра проволоки дл обеспечени When assembling, the mechanical stop must be screwed, for which the ends of the studs must have a relatively longer thread length. Due to the fact that the stop is located on the stud inside the contact spring, its diameter must be increased, which leads to an increase in the wire diameter to ensure

Claims

J of a certain force of the spring and, consequently, to a large consumption of material for its manufacture, the position of the stopper during assembly must be adjusted, which greatly increases the labor intensity of manufacturing the contact device. In addition, the use of a mechanical limiter in the form of a nut in the contact connections of those high-voltage switches, which use the outer ring or the fixed housing to strengthen the contact springs, not the studs, is impossible. The purpose of the invention is to simplify the device of a mechanical limiter and increase productivity in assembly. To achieve this goal, in a known contact device of electrical devices, containing at least two contact elements, one of which is equipped with a cylindrical spring and mechanical, the deflection limiter of this element from the second contact element during the passage of short-circuit currents, the mechanical restrictor is in the form of a cap, which spans the outside of the spring and is installed with an end gap in relation to its contact element equal to the sum of the stroke of the contact element p and incorporating in the direction of axis of the spring and tolerances in the assembly. FIG. 1 shows the contact device limiter in the form of a cap mounted on the stud; in fig. 2 - the same, the stopper in the form of a cap mounted on the outer ring. The contact device shown in FIG. 1, includes conductive lamellae 1, movable contact 2, contact springs 3 mounted on studs 4 which are fixed on the inner ring 5. Springs 3 are placed inside caps 6 which are installed with a gap between the lamellae 1 and the ends of the caps 6 equal to the sum the stroke values of the lamellae 1 when switched on in the direction of the spring axis 3 and the tolerance for assembly. The studs 4 have holes for a cotter pin 7, a nut that secures the nut 8, which fixes the position of the caps 6, relative to the slats 1. The contact device shown in FIG. 2, contains current-conducting lamellae 1, a movable contact 2, contact cylindrical springs 3, caps 4, whose position on the outer ring 5 is fixed by screws 6. The principle of operation of the contact device shown in FIG. 1, when the contact device is turned on to the short-circuit current, the caps 6 substantially limit the throwing of the lamellae 1 from the moving contact 2 due to mechanical shock and repulsive electrodynamic forces, which significantly reduces the length of the arcing and reduces the burning of the contact device. The principle of operation of the contact device with the limiter shown in FIG. 2 is similar to the operation of the contact device shown in FIG. 1. The use of the proposed technical solution makes it possible not to regulate the disconnector for axial contacts, but to automatically install a mechanical limiter, which simplifies contact joints and increases labor productivity during assembly, and for high-voltage circuit breakers, limits the debris of contact elements and thereby protects the contacts from burns, which increases the arc resistance of the contact and the switching capacity of switches, as well as the reliability of their work. Claims of the invention A contact device of electrical apparatuses comprising at least two contact elements, one of which is provided with a cylindrical spring and a mechanical restraint for the rejection of this element from the second contact element during passage — short circuit currents, characterized in that, in order to simplify the device and increase productivity labor during assembly, the mechanical stop is made in the form of a cap that covers the spring from the outside and is installed with an end clearance in relation to its a contact element equal to the sum of the stroke values of the contact element when switched on in the direction of the spring axis and the tolerance for the assembly Sources of information taken into account during the examination 1. USSR author's certificate No. 135124, cl. H 01 H 1/30, 1961.

2.V. V. Afanasyev. Electrical apparatus of high voltage.-Atlas designs. “Energie, 1977, p. 91, fig. 21-18.

3. USSR author's certificate number 279742, cl. H 01 H 1/50, 1970.