SU858158A1 - Explosion-proof transformer substation - Google Patents

Description

one

The invention relates to the field of explosion-proof electrical equipment and can be used in the production of miner Bt-safe safety transformer substations (CTS), the main electrical components of which are, namely, a power transformer, a high voltage switchgear (RUVN) and a low voltage switchgear (RUNN) enclosed in explosion-tight enclosures rigidly assembled into an aggregate assembly, each of which has on its body a corresponding marking of the level and type in ryvozaschity.

A device of an explosion-proof transformer substation is known, in which, when calculated for a test pressure of 1.0 to 1.5 MPa (1015 kgf / cm-), installed in accordance with the current rules for the manufacture of explosion-proof and mine electrical equipment according to the conditions of an internal explosion of a methane-air mixture in both normal (spark) and emergency (arc short-circuit) ignition modes, flameproof enclosures of the package transformer substation acquire significant metal consumption (mass), and their manufacture and hydrotesting are associated with increased labor with a capacity of 1.

However, the high pressure arising in the KTP shells during an internal explosion of a gas mixture reduces their explosion-proof properties, since it increases the likelihood of an explosion being transmitted to the surrounding explosive atmosphere.

Therefore, for large-sized explosions 10 in impermeable enclosures of QFT, the task of effective unloading, i.e. reducing the pressure of an internal explosion is of particular importance.

It is also known to construct an explosion-proof 15 mobile safe transformer substation with pressure relief. In this device, the electrical units RUVN and the low voltage switchgear are enclosed in an explosion-proof ae shell, and the power transformer is placed in a chamber 20 filled with quartz sand; Due to the high flame retardant and discharge capacity of the quartz filling, the transformer chamber does not undergo internal dynamic

25 explosive pressures, as the gas does not explode in the sand. However, the quartz filling of the transformer chamber was used to relieve pressure.

explosion in adjacent departments of the flameproof enclosures RUVN and RUNN. The latter are for this communicated with the transformer chamber through porous, and do not let in sand particles, elements of metal-ceramic or metal-fiber glasses immersed in sand and from the rthoron of the switchgear enclosures covered with perforated boxes filled with a sorbent, to provide moisture protection for the quartz filling of the transformer chamber, as well as protection of porous elements from the destruction of the electric arc in the event of an arc closure in the switchgear shell 21,

However, the possibility of reducing the explosion pressure in the RUVN and RUNN shells due to the flame-retarding and discharge capacity of the quartz filling chamber of the transformer cannot be used in the proposed QFT device, since in the latter the power transformer is enclosed in an explosion-proof non-quartz filling shell that needs unloading pressure the explosion in her gas-air mixture. In the absence of quartz filling, it is necessary to carry out the body of the substation of a large mass, which increases the labor intensity of manufacturing.

The purpose of the invention is to increase the explosion-proof mass reduction properties of the complexity of manufacturing a substation by reducing the explosion pressure.

This goal is achieved by the fact that explosion-proof unloading devices are proposed to be made in the form of two perforated metal cups concentrically fixed to the flange, and the space between these cups is to fill the non-combustible solid granular material of the corresponding fractions and layer thickness.

In addition, the glasses of the discharge device installed in the compartment of the inlets under the lid are proposed to be performed with a solid bottom facing the lid side.

FIG. 1 is a diagram of the aggregate assembly of the flameproof enclosures of the main electrical components of the package transformer substation with the proposed placement inside them of explosion proof discharge devices; FIG. 2 shows an explosion-proof unloading device of the proposed design; in FIG. 3, the same device, but intended to be installed in the compartment of the inlets under the lid,

The flameproof enclosures 1 and 2 (FIG. 1) of the switchgear and switchboard distribution devices are rigidly connected to the flameproof enclosure 3 of the power transformer. Adjacent compartments 4 and 5 of sheath 1 of one switchgear distribution substation, as well as compartments 6 and 7 of sheath 2 of another switchgear / unit are communicated with each other using explosion-proof unloading devices 8 and 9 installed in common walls 10 and 11 of corresponding shells of switchgear, Sheath 3 of a power transformer communicated with the compartments 4 and b of the shells 1 and 2 of the switchgear by means of the vrlvronchvoritnyh discharging devices 12 and 13, installed in the common walls 14 and 15 of these shells. At the same time, all the compartments of various PFC shells, communicated with the help of unloading devices 8, 9, 12 and 13, form a ramified system of discharging volumes for effective pressure reduction both in the explosion in the transformer envelope 3 and in any of the compartments 1 and 2 in the switchgear compartments KTP,

The explosion-proof unloading device (Fig. 2) consists of perforated metal cups 16 and 17 concentrically fixed on the flange 18. The space between the cups is filled with a gasket 19 of non-combustible solid granular material of the appropriate fractions and layer thicknesses.

Glasses 16 and 17 of the discharge device (Fig. 3), intended for installation in the compartment of the inlets under the lid, are made with a common solid bottom 20 facing the lid. The walls of the glasses are unloading devices in areas 21 and 22 at the solid bottom, as well as in areas. 23 and 24 at the points of attachment to the flanges at a height of not less than 10 mm, are made without perforation in order to reduce the edge effect of the granular packing

With the design dimensions of the internal discharge devices adopted for CTS shells while providing ease of installation and inspection, the degree of permissible pressure compression of the piece by hydrotest of the shells, due to the unloading pressure of the explosion, is from 2 to 3.3. 30% will reduce the metal content (mass) of the shell assembly and reduce the labor intensity of their manufacture by approximately 15-20%. Accordingly, the degree of explosion pressure reduction at; the application of unloading increases the level of explosion proof. properties of KTP.

invention formula

1. Explosion-proof transform-. turntable substation, containing the flameproof enclosure of the power transformer and rigidly connected to it in the aggregate assembly, the flameproof enclosures distribute

Claims (2)

Claim 1. Explosion-proof transformation. torus substation containing an explosion-proof enclosure of a power transformer and rigidly connected to it in an aggregate assembly of explosion-proof enclosures of distribution devices of higher and lower voltage, which are interconnected by means of explosion-proof discharge devices installed in the common walls of these enclosures, characterized in that, in order to increase explosion-proof properties, reducing the mass and the complexity of manufacturing a substation by reducing the pressure of the explosion, explosion-proof unloading e means are arranged in the form of two perforated concentrically fixed to the metal cup flange, between the walls which is placed vzryvoneproni-permeable pack of solid non-combustible granular material, 2, The substation according to claim 1, characterized in that the glasses are different. the load device intended for installation in the compartment of bushings under the cover is made with a continuous bottom facing the cover.