RU2260887C2 - Junction module for switchgear components - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: proposed junction module has independent connecting member inserted in jacks which are connected to modular members incorporated in operating and protective equipment of transformer substations and power distribution systems. Each connecting member has external flexible shroud accommodating conducting ring wherein plurality of conducting parts are installed and passed through ring channels. Mentioned conducting parts are assembled in bundle for its axial displacement and turning in ring which makes it possible to wire and connect them to respective contact leads provided in jacks and related to each of adjacent members.

EFFECT: eliminated leakage of protective gas during junction due to reliable sealing and insulation of joint.

6 cl, 7 dwg

Description

Subject of invention

The present invention relates to a connection unit for elements of electrical switchgears, in particular, to a system for coupling elements or modules of electric switchboards intended for use in power distribution systems and transformer stations, in which an independent connecting element is used for docking or interconnection between elements, which as an intermediate part is introduced into separate sockets provided for this purpose in each of the elements s and equipped with electrically conductive pins that are required to connect.

The subject of the invention is a docking system or connection unit between elements that are part of the working and protective equipment of power distribution systems and transformer stations, characterized in that the direct docking or connection takes place so as to constantly maintain mechanical tightness and electrical insulation of the connection, and thus prevent leakage of shielding gas, which is commonly used in this type of equipment, during the connection or docking operation.

BACKGROUND OF THE INVENTION

European Patent No. 0520933 describes a docking system for docking switchgear modules in transformer and similar stations, where each of the modules or elements has corresponding sockets, which together with a gasket form a tight joint, with each socket in a smaller or inner part hole for fixing the contact output.

Moreover, this European Patent describes how, with each pair of sockets located opposite each other and corresponding to two adjacent modules, an insulating housing, having the shape of a cone truncated on both sides, interacts as an intermediate part, the inside of which is a metal tube , inside of which a lot of electrically conductive pin parts are inserted, designed to connect the contact terminals of each element. The aforementioned electrically conductive pin parts are pulled together around the contact terminals by means of springs or rings located on their periphery.

Between the electrically conductive parts and the metal tube located inside the external insulating casing, there are a number of elastic tapes that allow a certain lateral mobility of these electrically conductive parts in order to prevent possible alignment errors between the contact terminals both in the case of displacement of the sockets and the elements themselves.

Description of the invention

In the proposed connection node for the elements of electrical switchgears, the first improvement is that the electrically conductive parts are installed in radial channels made in an electrically conductive ring, the outer diameter of which essentially corresponds to the inner diameter of the outer insulating body. A bunch of electrically conductive parts is fixed inside the insulating housing due to good contact between the aforementioned electrically conductive ring and the housing itself, however, it is possible to rotate so that the above bundle of electrically conductive parts can move radially to interface with the contact pins located inside the sockets, even when they are not aligned.

The electrically conductive parts have a central groove less than the width of the channel in the ring into which each electrically conductive part is inserted, allowing the radial movement of the latter inside the ring at the moment when the connecting unit is docked with the corresponding contact terminal. The above conductive parts are pressed against the ring by several circular springs, preventing any movement in the longitudinal direction, which may lead to the loss of these conductive parts.

Another improvement consists in the fact that the external insulating body of the connecting unit is made of an elastic material with great deformability and allowing it to adapt to the corresponding sockets if they deviate from the coaxial position, and thus guaranteeing an optimal mechanical seal between the connecting element and nests.

Moreover, it can be noted that inside the aforementioned elastic body there are two metal tubes mounted on each end of the body, providing a certain rigidity of the body for good sealing with sockets. The inner tubes are shorter than the casing, and thus leave a central portion for mounting an electrically conductive ring containing electrically conductive parts. These internal rigid metal tubes of the elastic casing make it impossible to strongly mismatch between the elastic casing and the sockets due to excessive deformation of the casing, which may be caused by improper installation of the socket, and which increases the likelihood of the existence of points of lack of contact between the sockets and the casing, and thus creating poor sealing capabilities.

Another improvement of the connection node involves a cap that fits into the sockets when there is no need for an electrical connection. The cap is designed for sealed and electrically insulated plugging of the socket and contact located in its lower part.

The improvement of the cap consists in achieving good mechanical and electrical insulation, and for this, a structure similar to the above-described connecting element is used, with a body of insulating material and an inner metal cup. This glass provides electrical contact, as well as a certain rigidity, which together with the elasticity of the outer casing provides good sealing.

In addition, the aforementioned metal cup contributes to the creation of equal potential space within the cap itself, which prevents partial discharge. To do this, a hole is provided in the lower part of the aforementioned glass through which a small protrusion of semiconductor material passes, which comes into contact with the output of the corresponding element and brings the cartridge to the same potential that it has a connecting output. This protrusion should be made of flexible material to compensate for possible changes in length and, thus, guarantee good electrical contact.

The aforementioned cap is equipped with a second metal cup, which together with the inner cup constitutes a capacitive divider, and a probe for measuring the voltage on the bus can be connected through the metal terminal of the outer cup.

A further improvement is that the three element sockets are combined using a three-phase metal plate acting as a screen, redirecting the electric field to the nests and thus preventing its concentration on the periphery. The three-phase plate embedded in the sockets has a slight bend that directs the electric field through the inside of the socket.

Brief Description of the Drawings

For a more complete understanding of the essence of this invention, in accordance with a preferred example of its practical implementation, the following is a detailed description of the invention with reference to the accompanying drawings, in which:

Figure 1 depicts a node that includes an independent connecting element designed for docking with a corresponding socket;

figure 2 is a transverse section of the connecting element, as well as a side view in section of two sockets to be mated, as well as the contact pins related thereto;

figure 3 is a front view of an electrically conductive ring into which semiconductor parts are inserted coaxially mounted inside an external elastic body;

figure 4 is a view in section of a cap intended for subsequent installation on the socket, in accordance with a variant embodiment of the present invention;

figure 5 is a front view of the cap depicted in the previous figure;

figure 6 is a top view of the three sockets of one element, combined using a three-phase metal plate;

figure 7 is a cross section of a three-phase metal plate shown in the previous figure, as well as the corresponding socket.

Preferred Embodiment of the Invention

Each independent connecting element shown in figures 1 and 2, for its connection with two consecutive sockets, contains an elastic insulating body (1) in the form of a cone truncated on both sides, inside which a pair of metal tubes (2) is inserted. Their total total length is less than the length of the housing (1) and leaves an intermediate zone for installing an electrically conductive ring (3) having many radial channels (4) into which the pin electrically conductive parts (5) are inserted. Their total outer diameter, as well as the diameter of the aforementioned conductive ring (3), is equal to the inner diameter of the elastic body (1), while the ring (3) is fixed in the central part of the body (1), and inserted between the ends of the metal tubes (2) inside the case (1). The beam formed by various electrically conductive parts (5) connected and installed in the radial channels (4) of the conductive ring (3) is firmly held directly inside the elastic housing (4) by means of precise contact between the ring (3) and the inner surface of the housing (1). However, it is possible for the electrically conductive parts (5) to rotate relative to the housing (1), so that this design can be radially shifted and connected to the contact leads (6) located inside the corresponding sockets (7), even when they are not aligned.

These electrically conductive parts (5) have a central groove (8), which ensures the placement of each electrically conductive part (5) in the corresponding channels (4) of the conductive ring (3). And, thus, a radial shift of these electrically conductive parts (5) is allowed at the moment when the connecting structure is connected to the corresponding terminals, despite their deviation in the case when the terminals are not aligned.

When the electrically conductive parts (5) are installed in the required position in the ring (3), and the corresponding springs (9) surround or are installed at the outer periphery at the ends of the parts of these electrically conductive parts (5), they will be tightly pressed against the ring (3) and any shift in the longitudinal direction will be impossible, which prevents the possibility of their loss.

As for the metal tubes (2), which are inserted into the elastic body (1), they are designed to provide a certain rigidity, which guarantees a good seal with the sockets (7).

As for the cap shown in figures 5 and 6, intended for installation in the sockets (7) in the case when there is no need for an electrical connection, the above cap seals the socket and electrically isolates the contact terminal located in its lower part. It should be noted that in order to achieve good mechanical tightness and electrical insulation, the aforementioned cap, generally indicated at 10, has a configuration similar to that described previously for the connecting element. Thus, the insulating body (10) is also elastic and a metal cup (11) is provided inside it by means of which an electrical contact is established, and which provides a predetermined rigidity, which, in combination with the elasticity of the outer case of the cap (10), ensures good tightness.

A hole is provided in the lower part of the aforementioned glass (11) through which a small protrusion (12) of semiconductor material passes, which comes into contact with the terminal (6) of the element, which brings the glass (11) and the space inside it to the same potential that has conclusion. This protrusion (12) must be made of flexible material in order to compensate for possible changes in length and guarantee a good connection with the corresponding contact terminal.

Moreover, the cap (10) on its outer side contains a second metal cup (13), which, together with the aforementioned cup (11), constitutes a capacitive divider, which allows the probe to measure voltage through the metal terminal (14) of the outer cup (13) on the bus.

The above cap (10) is fixed to the element in the closed position using a flat metal plate (15), which has a pair of oval holes (16) for screws or other suitable fastening means.

As for the sockets (7) per se mounted on the corresponding element, it can be seen that the three sockets of the same element, as shown in Figure 6, are connected by a three-phase metal plate (17), which acts as a screen and weakens the fields in the sockets (7), preventing concentration of the above fields on the periphery. The above three-phase metal plate (17) is embedded in the nests (7) and is combined with them directly during molding, and is also attached to the element by welding along its entire perimeter. The above plate (17) also has a slight bend (18) in that part, which is embedded in the corresponding socket (7), directing the electric field inside this socket.

Claims (6)

1. The connecting node for the elements of electrical switchgears, used for modular elements of working and protective equipment in transformer stations and power distribution systems, designed to provide mechanical tightness and electrical isolation, including an independent connecting element made with the possibility of insertion into sockets pre-connected to elements of electrical switchgears and having corresponding contact leads, while m independent connecting element includes a bunch of electrically conductive parts for docking with the contact pins of the sockets, and a tool that provides the ability to bias the electrically conductive parts for cases where the contact pins are not aligned, while in the case when there is no need for an electrical connection, a cap is mated with socket for electrical insulation of the contact output, characterized in that the independent connecting element includes an external housing (1) made of an elastic material, internal three and partly outside the semiconductor which is provided for better regulation of the electric field; a pair of metal tubes (2), the total length of which is less than the length of the outer case (1), located in the outer case at the edges so that the free space of the central part of the outer case (1) is provided; a bunch of electrically conductive parts (5) coaxially fixed in the corresponding channels (4) in a metal electrically conductive ring (3) inserted into the outer casing (1), while the electrically conductive ring (3) is located in the central part between the ends of the metal tubes (2), firmly holding the ring (3) in the housing (1), and between the electrically conductive parts (5) and the metal tubes (2) there is sufficient space for a certain rotation of the beam of electrically conductive parts (5) to allow them to be displaced when the contact Leads (6) are not aligned. 2. The connecting unit according to claim 1, characterized in that the central groove (8) is made in the electrically conductive parts (5), the height of which is less than the height of the channels (4) made in the electrically conductive ring (3), which leaves free space between the electrically conductive parts (5) and the inner surface of the tubes (2) and allows the radial movement of these electrically conductive parts (5) inside the electrically conductive ring (3) when they are mating with the terminals, as well as the rotation of the above electrically conductive parts (5) inside the case teas when the contact leads are not aligned. 3. The connecting node according to claim 1 or 2, characterized in that on the outer parts of the electrically conductive parts (5) springs (9) are installed, pressing a bunch of electrically conductive parts (5) to the electrically conductive ring (3), which, together with the grooves in the electrically conductive parts (5) prevent the displacement of the conductive parts (5) in the longitudinal direction and, accordingly, their loss. 4. The connecting unit according to claims 1 to 3, characterized in that the cap (10) includes an external insulating body made of elastic material, on the inner and outer surface of which semiconductors are provided for better regulation of electric fields, and contains an inner metal cup (11 ), providing the specified rigidity and tightness in combination with the elasticity of the cap body (10), while the above metal cup (11) ensures the creation of equal potential space inside the cap (10), preventing rotating the partial discharge, for this, a hole is made in its lower part through which a small protrusion (12) passes, made of a flexible semiconductor material, coming into contact with the corresponding contact terminal and bringing the cup (11) and its internal space to the same potential, that has a contact terminal, ensuring good contact with the corresponding terminal. 5. The connecting node according to claim 4, characterized in that the cap (10) on its outer part has a second metal cup (13), which together with the inner cup (11) forms a capacitive divider that allows you to connect the probe for measuring voltage on the bus with using a metal terminal (14) connected to the outer cup (13), while the above cap (10) is equipped with a flat metal plate (15) with elliptical holes (16) for tightness of attachment to the element of the electrical switchgear. 6. The connecting node according to claim 5, characterized in that the three sockets (7) of one element are combined using a three-phase metal plate (17) directly embedded in the sockets (7) and having a slight bend (18) to redirect the electric field inward the nests (7), and the three-phase metal plate (17) is connected by the nests (7) directly during molding.

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