SU1035666A1 - Gas filled switching apparatus - Google Patents

Abstract

GASONAPOLNBNNT COMMOGGATION UNIT containing units combined into a single gas cttcr & ty blocks of hollow opera insulators with different; The inside of the arc arrester & chambers, contacts, bellows, is different from the fact that, in order to make it compact, it is equipped with an SF6 fuse combined with a multi-stage switch for the back-up fuses, which are placed:. at least / in one of the blocks, with the internal cavity of the fuse fuse connected to the internal cavity of the insulator. CO sp o a f

Description

 The invention relates to electrical apparatus and relates to the structures of a high-voltage switching apparatus, in particular, an SF6 load switch with safety switches. In distribution networks for a voltage of 6-220 kV, switches of various designs are widely used as operational and protective devices. Switches are quite complex and expensive devices. Their use significantly increases the cost of electrical installations. Known load switches, in particular, are elegas autocompressive. The arc in these apsfats is extinguished by flow. The gas that enters the quench zone from the compression chamber consisting of a movable cylinder and a fixed piston is Cl3. Despite the fact that such devices are much cheaper than circuit breakers .. they are all relatively complex and relatively expensive. High voltage switchgear are known with single-phase gas-insulated switching devices in one, two or three directions. 2.. However, the design of gas-insulated commutating apparatuses has not been developed in them, gas-insulated fuses are not mentioned. The closest in technical essence to the invention is the gazb of the filling switching device, which combines into a single gas system, blocks of hollow supporting insulators with internal arresting chambers, contacts, bellows Gz} inside .. However, in the embodiment of using the known switching device in the form of a switch load it is not provided to supplement it with a fusible gas-insulated fuse. t egshenit switch. In addition, the primordial gas-filled switching {nd device with face contacts is not reliable enough and is not capable of disconnecting the short circuit current. In networks of 610 kV, the load switches are sometimes filled with separately installed fuses f; however, the dimensions of the combined apparatus are significant by themselves, shooter fuses have to be removed from the specimen parts to prevent electrical overshoots upon discharge hot ionized gases into the atmosphere when the fuses are blown out, as a result of which the annapaTia compactness and installation is generally not achieved. The purpose of the invention is to increase the compactness of both the switching apparatus itself and the distribution devices in which it is used. This goal is achieved by the fact that in a gas-filled switching device containing blocks of hollow bearing insulators combined into a single gas system with arcing chambers placed inside i, contacts, bellows, is equipped with a gas-insulated fuse combined with a multi-stage switch of reserve fuses placed in at least one of the blocks, and the internal cavity of the fuse is connected. with the internal cavity of the insulator. FIG. 1 shows a gas-filled switching unit with two blocks, side view in FIG. 2 - the same, top view} in FIG. 3 - fuse located in the block in FIG. 4 - fuse with multistage backup fuse switch; Fig.5 gas-filled switching device with three blocks, side view; in fig. 6 - the same, top view; Fig. 7 is a schematic diagram of a two-transformer substation using a gas-supplying switching device; in fig. 8 - the same, one-transformer substation. In the gas-filled switching apparatus - (FNG. 1) the arcing block 1 is mounted on the box 2, in which the mechanism connecting the moving contact of the arcing block to the insulating block is located in the supporting block - insulator 3, mounted on the base 4. In the internal cavity of the unit 5, which is also mounted on the box 2, there is a fuse or a set of several automatically replaceable fuses. The circuit for installation of the fuse in block 5 is shown in FIG. The BLOCK (Fig. 3) contains a porcelain insulator 6, hermetically sealed with flanges 7 and 8; The flange 8 has twisting 9 and is equipped with a valve 10. By means of a valve 10 and tubes (not shown), internal, sealed from the external environment, volume: isolator 6 when assembling the device is combined with internal cavities of blocks 1 and 2 (fizg. 1-) , resulting in a single gas volume, filled with SF6 gas. In the internal cavity of the isolator b (Fig. 3), gas-insulated fuse 12 is installed in contact holders 11. The internal cavity of the fuse communicates with the internal cavity of the isolator 6, and a vacuum cable rb-i is supplied to this cavity when npe-j is triggered

guardian Thus, in my proposed design, there is no release of ionized gases into the atmosphere and the device can be installed in a limited volume (in gas generating fuses and dischargers, the exhaust zone can reach 3x2 m in size with a voltage of 110 kV and 2.5x1.5 m 35 kV), In addition, due to the fact that the fuse in the proposed device is placed in an SF6 gas, its dimensions are significantly reduced. The inclusion of the fuse 12 in series in the circuit is carried out by means of a flexible conductor 13, the contact end of which enters the socket contact 14 fixed on the bottom of the fuse. The contact 14 is surrounded by a shield 15,

Instead of a single fuse, it is possible to install a set of several fuses with a multistage (multi-position) switch for reserve fuses. . Installation scheme in block 5 of a set of multi-stage fuses. The backup fuse switch is shown in FIG. 4. A kit is installed in the inner cavity of the isolator 6; of several fuses 16. Replacing a blown fuse with a backup fuse is carried out by a switching device 17, which by means of a rod 18 is connected with: a switching device drive. A bellows 20 is used as a rolling seal that seals the inner cavity of the insulator 6 and allows the moving contacts 19.1 and 19.2 to communicate movement. In this case, the gas-filled switching device is fully equivalent to the switch: the working currents switch the load switch disposed in block 1 (Fig. .1), and protective functions, including automatic reclosing, provide a set of fuses with a multi-stage (multi-position) switch. At voltages of 6–35 kV, the load switch and fuse of one phase or all three phases can be placed in a common shell filled with SF6 gas.

In the apparatus shown in FIGS. 1 and 2, two units 1 and 5 are mounted on the duct 2. In the apparatus shown in FIG. 5 and 6, on the box 21 mounted on the hollow support insulator - block 22, three blocks 23, 24 and 25 are fixed. The movable contacts of two arc blocks (for example 23 and 24) are connected with mechanisms placed in the box 21 Two ways, located in the inner cavity of the block of the support insulator 22. Tg, with the help of mechanisms located at the base 26, are connected with the drives controlling the operation of the corresponding block. B: chamber 25 is fitted with a fuse or a set of fuses (Fig. 3 and 4) A variant of a combined gas-filled switching device is possible, in which the fuses are installed in two blocks. Electrical connections of 35–110 kV sub-gantiums with such combined devices are shown in FIG. 7 and 8. In FIG. 7 is a diagram of a two-transformer substation, and in FIG. 8 a single-transformer substation. In both cases, the substations are included in the cutting of the passing power lines, with fuses installed in the circuits of the transformer 5mators to protect them and gas-filled switching devices made with arc-suppressing devices designed to cut off the load current, i.e. in the form of load switches, included in the line of the Substation. They may have a voltage from 6-10 to 35-110 and higher kilovolts. Here, for the substation in FIG. 7, two switching devices are applied, each of which has fuses and a switch-disconnector, and for the substation of FIG. 8 - one switching device containing two load switches and one set of fuses.

The connection of the internal cavity of the fuse 12 with the internal cavity of the insulator 6 prevents the release of ionized gases (when fusible, inserts during combustion) into the atmosphere. At the same time, the pollution of the SF6 gas is not significant: in view of the fact that the products of combustion of the fusible insert (silver, copper, and other metals) form metal fluorides with SF6 gas, their amount is insignificant, since the operation of all the fuses in the backup fuse switch (4-6 pcs.) of the SF6 gas in the fuse box will be replaced. The absence of emissions of ionized gases into the atmosphere (at a distance of up to 1.5–3 m) makes it possible to bring the fuse box closer to the grounded parts of the switchgear and thereby increase its compactness. At the same time, the compactness of the combined apparatus itself increases as compared with the separate installation of fuses and load switches, the reduction in the size of the fuses also plays a role due to the placement of the fusible insert in the gas and not in the air. Thus, the compactness of the devices is increased, and the economic effect is determined by the cheapening of the apparatuses themselves. The proposed gas-filled switching device is replaced by a power switch in its functions.

b P / 15 711 0

F

T

l / g7

Pin.8

Claims (1)

(5 7) GAS-COMPLETED COMMUTATION DEVICE, containing blocks * of hollow support insulators combined with a single * system _; placed inside the arcing chambers, contacts, bellows, characterized in that, in order to increase compactness, it is equipped with a gas fuse, combined with a multi-stage switch for backup fuses, which are placed in at least one of the blocks, and the internal cavity of the fuse the fuse is connected to the internal cavity of the insulator.