RU180980U1 - HIGH VOLTAGE FUSE UNIT DEVICE - Google Patents

Abstract

The invention relates to devices for switching electric current at power plants and substations during emergency shutdowns of short-circuit currents. A device is proposed that includes an insulating case of a unit with built-in contact nodes, filled with air, a fuse located in this case, a plug for the case and current leads, in which a semiconductor cylinder is built into the insulating casing, covering the fuse and connected to the contact nodes, while the outer surface of the casing has conductive sloy.Poleznaya model provides increased security operation fuse block and reduce the size of the block.

Description

Technical field

The utility model relates to devices that provide switching electric current in power plants and substations during emergency shutdowns of short circuit currents.

State of the art

Known fuse proposed in the patent US 2005/0077994 A1, HH 85/04. The device contains a fuse with terminals located at the ends of the fuse, a hollow cylindrical screen placed around the fuse. A cylindrical screen in one section is connected to the fuse terminal, and there is a gap between the second fuse terminal and the cylindrical screen.

Vacuum interrupters are proposed in the patents US 2005/0082260 A1, H01 3/00, H01 33/66 and US 2006/0096856 A1, C23C 14/00, (2006.01). The device contains a ceramic vacuum chamber with conductive tips. One tip is attached to the fixed contact, and the second to the movable, designed to interrupt the electrical circuit. The movable screen inside the vacuum chamber is attached to the ceramic wall of the vacuum chamber and is separated from the fixed and movable contacts. A portion of the vacuum chamber is coated on the outside with a semiconducting material, and a conductive screen covers a portion of the outside of the vacuum chamber and is attached to the conductive tip of the vacuum chamber. The vacuum chamber and the screen attached to it are housed in a common housing made of dielectric material.

Known load switch proposed in the patent US 2010/0022111 A1, H01R 13/53, (2006.01). The device includes a power cable and a sleeve with an increased spark gap. The power cable includes a conductive element having an excited part and an unactivated part, the receiving end of the power cable being the receiving end of the insert for the load sleeve. The sleeve insert includes an insulating outer casing and an insulating connecting sleeve. The insulating outer casing has an axial hole with a conductive socket, a first, second end of the middle section and a transitional shoulder part between the second end section and the middle part. The insulating inter-pole sleeve extends along the outer casing from the middle to the second end section. When the force of the frontal elbows is set at the second end portion, the upper distance from the upper part of the second end section to the lower part of the elbow cuff increases.

Known electrical connector proposed in the patent US 2011/0189887 A1, H01R 3/00, (2006.01). The device comprises a connector housing having a connector for mounting a conductor, a first end of the connector and an open port. The contact device can extend axially in the connector housing from the end of the conductor to the first end of the connector. The conductive insert can be inserted into an open port. At least a portion of the contact assembly is visible through an open hole prior to insertion of the conductive insert or after removal of the conductive insert. At least a portion of the contact assembly is visible through a visible open port before inserting a conductive insert or after removing a conductive insert. Part of the contact node through the open hole includes a first contact part and a second contact part separated by a gap. A part of the conductive insert is installed in the gap between the first contact part and the second contact part to allow current to flow from the second contact part to the first contact part when the conductive insert is inserted into the open hole.

Known fuse proposed in the patent US 6491548 B2, H01R 13/68, H01R 33/95, H01H 39/00. The device includes a fuse holder, which includes an electrically isolated and shielded housing for placing a fuse inside the pipe and an electrical device for underground distribution. There is an insulating tube inside the housing to facilitate the removal of the fuse through the end cap, so that the holder can be reused when replacing the fuse.

Known fuse proposed in the patent US 7327213 B2, H01H 85/175 (2006/01), H01H 85/042 (2006/01), H01 B17 / 44 (2006/01). The device contains a fuse included in the housing with terminals located at the end ends of the fuse, as well as a coaxial screen. One side of the screen is electrically connected to one of the fuse terminals. There is a guaranteed clearance between the second side of the screen and the second fuse terminal.

Known electrical connector proposed in the patent US 8388381 B2, H01R 24/00, (2011.01). The device comprises a connector housing having a receiving contact of the conductor, the interface of the first communication line, the second communication interface, the first contact of the connector and a visible open port between the interface of the first communication channel and the interface of the second communication line. The first communication interface can be connected in a conductive manner to the receiving contact of the conductor, and the second communication interface can be located axially from the first interface and connected inductively to the first contact of the connector. The insulation material may be located axially between the first interface of the communication channel and the second interface of the communication line inside the connector housing. At least a portion of the insulating material may be visible through a visible open port.

The disadvantages of the above known devices are: the inability to use in the cells of switchgear with solid shielded insulation; low safety during operation, especially with uncontrolled destruction of the fuse.

Closest to the proposed utility model in technical essence is the fuse box proposed in the patent US 5903209 A, H01H 85/042, H01H 85/165, H01H 85/02. The fuse box contains a fuse integrated in the insulating outer casing. The outer surface of the fuse is coated with an electrically conductive material that is electrically connected to one of the fuse links and extends along the outer surface of the fuse housing, leaving part of the fuse body uncoated with a conductive material. A fuse terminal that is not in contact with the conductive material is surrounded by an electrically conductive insert located inside the insulating outer casing, which together with the conductive coating creates an effective shield around the fuse, preventing an alternative electrical circuit between the fuse terminals. The fuse box may include a fuse that electrically expands the fuse, so that fuses of different sizes can be used in a standard size case. The main disadvantages of the prototype device, as for the devices listed above, are the inability to use complete switchgear with solid shielded insulation in the cells, low safety during operation, especially with uncontrolled fuse failure.

Utility Model Disclosure

The objective of the utility model is to increase the operational safety of the fuse block and reduce the size of this block.

The solution to this problem is achieved by the proposed device, including the insulating housing of the unit with built-in contact nodes, filled with air, a fuse located in this housing, the plug of the housing and current leads, in which a semiconductor cylinder is embedded in the insulating housing, covering the fuse and connected to the contact nodes, the outer surface of the housing has a conductive layer.

Brief Description of the Drawings

In FIG. 1 shows a diagram of the claimed device 1 - insulating housing, 2 - conductive coating, 3 - semiconducting cylinder, 4 - contact nodes, 5 - fuse box, 6 - plug fuse box, 7 - current leads.

In FIG. 2. experimental data are presented confirming the operability of the proposed technical solution: in the absence of a semiconducting screen, it is necessary to almost double the radial dimensions of the fuse block housing to eliminate partial discharges.

Utility Model Embodiment

In FIG. 1 shows a diagram of the inventive device. The fuse block device contains an insulating casing (1) with a conductive coating (2) on its outer surface, a semiconductor cylinder (3) integrated in the casing, connected to contact nodes (4), a fuse (5) located inside the casing, and a fuse block plug (6 ) and current leads (7).

The proposed device operates as follows.

A plug is opened (6) and a fuse (5) is installed inside the fuse block housing (1), the ends of which are connected to the contact nodes (4) during installation. The plug (6) closes and high voltage is applied to the current leads (7). The potential of the applied voltage is transmitted to the semiconductor cylinder (3) and the fuse (5). Thus, the surface of the fuse (5) and the semiconductor cylinder (3) are at the same potential and there are no partial discharges in the air gap between the fuse (5) and the semiconductor cylinder (3). The resistance of the semiconductor cylinder (3) is significantly higher than the resistance of the fuse (5) and the electric current practically does not flow through the semiconductor cylinder (3). When a fuse blows, its resistance increases sharply, and the short circuit current is sharply limited, and already with the help of other switching devices, the fuse block is turned off. The plug (6) opens and the fuse (5) is replaced.

We give an example of the implementation of a utility model on a prototype of the proposed device, equipped with recording equipment.

A prototype device includes all elements of the device.

The figure 2 shows the results confirming the operability of the device.

Thus, a device is proposed that provides increased safety for the operation of the fuse block and a reduction in the dimensions of this block.

Based on the patent search and analysis of known technical solutions, it was found that the use of a semiconductor cylinder to improve the safety of the fuse block and reduce the dimensions of this block was not found.

Claims (1)

A high-voltage fuse block, comprising an insulating block casing with integrated contact nodes, filled with air, a fuse located in this casing, a cap for the casing and current leads, characterized in that a semiconducting cylinder is integrated in the insulating casing, enclosing the fuse and connected to the contact nodes, while the external the surface of the housing has a conductive layer.

Images