RU2324254C1 - Load-break switch-fixed fuse hybrid device - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: load-brake switched-fixed fuse hybrid device provides the possibility of replacement of fusible element at work station and includes arc extinction chambers fastened on lower bridge of fixed frame, while socket contacts are fastened on upper bridge of said frame. Housings of fuses are installed on a movable bar that is located on the releaser and connected with the driving rod. The bar is installed in such a manner as to be able to move between upper and lower bridges of the frame. Upper fixed contacts of fuses interact with socket contacts, while lower movable contacts of fuses are connected with conductive contact rods with arc extinction sections that interact with contact systems of arc extinction chambers. The conductive contact rods have springs of fuse switching-off installed on them in contracted state. Switching-off springs of load-break switch are installed in contracted state between upper bridge of the frame and the movable bar.

EFFECT: extension of functionality as well as simplification of design and operation.

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Description

The invention relates to the field of electrical engineering, and more specifically, to high-voltage apparatus engineering and can be used as a three-phase apparatus for switching and protection against damage to individual sections of electrical distribution networks of 6-10 kV.

Known high-voltage fuses of the brand PC, PCE, used in the CIS countries, mainly to protect transformers. These fuses consist of ceramic tubular, about 40 cm long enclosures filled with high-quality quartz sand, and at the ends having contact parts. Inside quartz sand, spiral fusible inserts of silvered low-melting metal are placed.

Under the influence of a certain overload or short circuit, an explosive rupture of the fuse fuse and, therefore, an open circuit occurs. The high temperature of the arc leads to the formation of closed channels from molten quartz sand, inside of which the arc goes out under the influence of increased pressure.

The main disadvantages of these fuses are:

1. The inability to recharge (after operation) at the workplace. Usually, the fuses that have been fused are replaced with new ones, which requires a certain margin, or wound with wires (instead of a fuse insert) and installed with all the ensuing consequences.

2. The need to install a disconnector or load breaker in a circuit with fuses to disconnect the circuit if it is necessary to work with fuses.

A stationary fuse is also known, which differs significantly in PC fuses in design and size. However, the need to install disconnectors or circuit breakers in the circuit remains.

In order to eliminate the above drawbacks, the present invention provides a hybrid implementation in one device of the load switch with fuses, which provides enhanced functionality, simplifying the design and operation of the apparatus.

The essence of this invention is illustrated by drawings, where figure 1 shows this hybrid device in the on position; in Fig. 2 - a hybrid apparatus when the load breaker is tripped (disconnected); figure 3 - hybrid device in position when the fuse in one of the phases (in phase A).

The frame of the proposed apparatus consists of a fixed frame (1) and a movable bar (2) made of asbogetinax or asbestos-laminate. Arc quenching chambers (3) are located on the lower jumper of the frame (1), and socket contacts (4) are located on the upper jumper. On the movable bar (2) installed with the possibility of moving between the said jumpers of the frame (1), the stationary fuse bodies (5) and the drive rod (7) are fixed. Fuse links (5) are installed between their upper fixed contacts interacting with the indicated socket contacts (4) and the lower movable contacts, which are connected to current-carrying contact sections (6) with arcing sections (shaded) that interact with contact systems of the quenching chamber arcs (3). The operation of the circuit breaker as a load switch is provided by the breaking springs (8), and as a fuse - by the breaking springs (9).

A detailed description of the stationary fuses used in this invention is given in the copyright certificate of the Republic of Armenia No. 1602 A2, 04/11/2005, author S.K. Khachatryan.

The device can be installed in KSO both stationary (on supporting insulators) and on casters for operation in withdrawable mode.

In the switched on state of the apparatus (Fig. 1), the movable bar (2) with the fuse bodies (5) rigidly connected to it, as well as the live-current contact rods (6) with the arcing sections are in the upper position, providing electrical communication between the contact systems of the arc extinction chambers (3) and socket contacts (4) of fuses. The rod (7) is pulled up and located on the release, and the spring disconnecting switch (8) is compressed. Fuse springs (9) are also wound up.

When the device operates as a fuse (overload in the circuit or short circuit), the fuse fuse blows out (5) and, under the action of the disconnecting spring (9) of this phase of the fuse, the current-carrying contact rod (6) with an arcing section enters the arc quenching chamber and shuts off the damaged phase. As an example, figure 3 shows the action of the fuse in phase A.

If it is necessary to operate the device as a load switch (Fig. 2), the rod (7) is removed from the release and, under the action of the disconnecting springs (8), the movable bar (2), together with the fuse bodies (5), rushes down, ensuring the opening of the fixed fuse contacts (5) ) with socket contacts (4) and disconnecting the circuit.

In order to facilitate the conditions of arc extinction, there is a constructive possibility, if necessary, to increase the number of breaks per phase.

Claims (1)

Hybrid device load switch - stationary fuse, containing arc extinction chambers (3), mounted on the lower jumper of the fixed frame (1), stationary fuses (5) and drive rod (7), characterized in that it is equipped with a movable bar (2) installed with the possibility of movement between the upper and lower jumpers of the frame and connected to the drive rod (7) located on the release in the upper position of the strap (2), between which the compressed compressors are installed between the upper jumper of the frame (1) springs (8) of the load switch, and additionally inserted socket contacts (4) are fixed on the upper jumper of the frame (1), interacting in the upper position of the strip (2) with the upper fixed contacts of the stationary fuses (5), the cases of which are rigidly fixed to the specified strip ( 2), and the lower movable contacts of which are connected to additionally introduced current-carrying contact rods (6) with arcing sections that interact with the contact systems of the arc quenching chambers (3), and on these current-carrying con stroke rods (6) are installed in a compressed state breaking springs (9) stationary fuses (5).

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