SU729713A1 - Shaft transformer substation - Google Patents

Description

one

The invention relates to electrical engineering, in particular, to structures of mine transformer substations, which serve for the electrical supply of explosive production facilities.

Mine transformer substations are known, which are intended for power supply of mine electrical consumers 1 and 2 .le

Mine transformer substations contain a transformer unit and switchgears of the highest (RUVN) and lower (RUNN), for example. Transformer unit and distributor 5 devices are placed in individually flameproof enclosures. RUVN and OUVN shells are mounted on steel walls, which serve as lids for the trans-20 shell of the format knot, which protects against corrosion by means of flanges. Control and protection equipment is mounted in the shells of switchgears. In the upper part of the sheath there are 25 cable boxes with covers and cable glands for cables. The switch-disconnector switch of the load is mounted in the high-voltage switchgear, and in the low-voltage switchgear - an automatic switch and a set of equipment provided for

assigned to control and protect the power equipment included in the network and the transformer unit of the substation.

The electrical connection of the transformer assembly with switchgear is carried out by means of current feedthroughs.

Pass-through current inputs, penetrating the walls of switchgears are a source of additional losses. The currents passing through them induce eddy currents that heat the inlets to a high temperature. This leads to an increase in temperature in the low-voltage switchgear, complicates the work of: switching, protection and control equipment, impairs the cooling of the active part of the transformer node.

These disadvantages are partially eliminated in the mine transformer substations of the type TS Ball screw 3.

Claims (3)

In these substations, the low voltage switchgear is separated from the cover of the active part of the transformer unit. The lid and the distributor are interconnected by a pipe of large diameter, which are closed on the RUUNP side with a plate penetrated by pass-through current inlets. However, in these substations, there is no significant reduction in the temperature of the low-voltage switchgear. In addition, an increase in the length of the station sharply reduced the rigidity of the structure, and the need for two walls to ensure explosion safety led to an increase in the mass of the product. The purpose of the invention is to improve the cooling of the bushing current inputs, as well as reducing the size and weight of the structure. This is achieved by the fact that in a mine transformer substation containing a transformer node, high-voltage and low-voltage switchgears are placed in individual shells that are fixed to the covers of the transformer node’s shells, and the current-carrying passage is located in the covers and adjacent shells. the clamps, the wall of the shell of the low-voltage switchgear is made with channels, the upper and lower ends of which communicate with the environment, when it said channels arranged between the through conductive terminals. FIG. 1 shows a transformer substation, a general view of FIG. 2 - a node of pass-through current inputs mounted on an intermediate plate C with vertical channels; in fig. 3 shows the placement of channels in the wall. The mine transformer substation has a transformer unit 1, switchgears RUVN 2 and RUNN 3, housed in explosion-proof shells 4, 5 and b, respectively. The casing 6 of the distribution device RUNN 3 is made together with a wall 7 containing vertical channels with a wall 7 containing vertical channels 8, between which pass-through, current-carrying terminals 9 are located. The lower and upper ends of the vertical channels are made open for communication with the surrounding atmosphere and heat removal by natural convection. Heat released in conductive clips and the wall through thermal conductivity and natural convection is discharged into the environment. Reducing the thermal resistance between the heat source and the environment due to the implementation of channels located in the immediate vicinity of the current-carrying clamps, and its natural convection of air into the surrounding atmosphere due to the free circulation of air through the vertical channels reduces the temperature in the low-voltage switchgear shell by 5 -8 ° C and create normal conditions for the operation of the control switching and protection equipment. This allows reducing the overall dimensions of the transformer substation along the length and increasing the rigidity of the structure, which, in turn, reduces the thickness of the intermediate wall and the mass of the substations. Claims of an Invention Mine of a transformer substation comprising a transformer node, housed in a flameproof enclosure, switchgears of higher and lower voltages in individual shells, which are fixed to the covers of the shell of the transformer node, and through the shells and the adjacent shells there are passable current-carrying clamps, distinguished by that, in order to improve the cooling of the lower voltage switchgear and increase the rigidity of the structure as a whole, the wall and the dispenser lower voltage is provided with channels ;, upper and lower ends of which communicate with the environment, said channels arranged between the through conductive terminals. Sources of information g-, ai taken into account during the examination 1. Selischev AI Mine dry transformers and mobile substations. M., Nedra, 1968. 2. Zaitsev I. I. et al. Quartz-filled explosion-proof mine transformers and substations. M., Nedra, 1970. 3. The Prospect of VDNH Mine explosion-proof mobile substations