RU2121742C1 - Pole-mounted transformer substation - Google Patents

Abstract

FIELD: power engineering. SUBSTANCE: substation has one or two poles mounting on cross-arms 2, lead- in insulators 3, disconnecting cutouts 5, power transformer, surge voltage limiters, and low- voltage device 7 interconnected through conductors 8, as well as ground circuit. In addition, substation is provided with safety conducting screen 12, for example, metal screen with stiffness band over perimeter. Screen 12 is placed between power transformer 6 and disconnecting cutouts 5; they are electrically connected with ground circuit 11 of substation. Conductors interconnecting disconnecting cutouts 3 and power transformer 6 are spaced through adequate distance from screen 12 and pole 1. As an alternative, safety screen 12 may be mounted on cross-arm carrying disconnecting cutouts 5 or the latter may be installed on lower stiffness band of safety screen 12. EFFECT: reduced size, material input and improved reliability of substation. 3 cl, 4 dwg

Description

 The invention relates to electrical engineering and can be used in the construction of pole (mast) transformer substations used to power various consumers.

 Known pole (mast) transformer substation (L1), containing input (receiving) insulators, step-down power transformer, high-voltage surge arresters (arresters), fuses and low voltage device with switching equipment, interconnected by conductors. The specified equipment, called a transformer block, is placed on metal structures (traverses), mounted on a support (pole or mast), made of reinforced concrete, metal or wooden. The equipment is electrically connected to the grounding circuit of the substation (grounded). The substation is connected to consumers through a low voltage device.

 Depending on the capacity of the substation, its equipment is fixed on one support (L2) (mainly with transformers with power up to 100 kVA) or on two supports (mainly with transformers with power from 100 to 630 kVA).

 In addition, the substation also includes a disconnecting point, consisting of a disconnector with a drive, which is installed on a stand-alone support 5-7 meters from the transformer. The power supply line is connected to a disconnecting point, which in turn is connected by a busbar to the input (receiving) insulators of the transformer unit.

 This design of the substation is also caused by the fact that when the load was removed and the disconnecting point was disconnected, it was possible to safely inspect the power transformer and other equipment of the substation without disrupting the normal operation of neighboring circuits connected to the same power line as the substation in question.

 Such substations occupy a large area, have large dimensions and high consumption of materials, because contain a stand-alone disconnect point, requiring wiring with a transformer unit. In addition, a large amount of metal is required for fastening structures for equipment. The presence of a large amount of equipment reduces the reliability of the entire substation.

 The objective of the present invention is to provide a pole (mast) transformer substation with reduced dimensions, material consumption and increased reliability.

 The solution to this problem is achieved by the fact that in a pole (mast) transformer substation containing at least one support (pole), on which the input (receiving) insulators, fuses, disconnectors, power transformer and low voltage device are connected to each other are placed wires, the substation is equipped with a conductive protective shield made, for example, of a metal mesh with a loop stiffener installed between the power transformer and the fuse-disconnectors and the connection electrically connected to the grounding circuit of the substation, and the connecting wires between the fuse-disconnectors and the power transformer go around the shield and the support at the required insulation distance. The screen can be installed and fixed with its lower part of the stiffening belt also on the traverse, on which the fuse-disconnectors are fixed, or vice versa, fuses-disconnectors can be installed on the lower stiffness of the screen.

 In FIG. 1 shows a pole (mast) transformer substation on one support, the main view; in FIG. 2 is a side view of this substation; in FIG. 3 - substation with 2 supports, main view; in FIG. 4 is a side view of this substation.

 The substation (Figs. 1 and 2) contains a support (pillar) 1, on which a high-voltage input (receiving) insulator 3 of the substation is mounted on the traverse 2, fuses-disconnectors 5 mounted on the traverse 4, a power transformer 6 and a low voltage device 67.

 The substation is connected to the high voltage line, the wires of which 8 are fixed on the input insulators 3. Using the wires 9, the fuse-disconnectors 5 are connected to the wires 8.

 The fuse disconnectors 5 and the power transformer 6 are interconnected by wires 10. To ensure the safety of the equipment, the substation is connected to the grounding circuit 11 of the substation (grounded) in the usual way (for example, steel current-carrying buses or conductors).

 Between the fuse-disconnectors 5 and the power transformer 6, a protective shield 12 is installed, made conductive, for example, from a metal mesh 13 with a stiffening belt 14 along the contour, made, for example, from angle steel, i.e. light and tough enough. The screen 12 can also be made of metal rods with a stiffening belt of pipes, channels, etc. or from a metal sheet with holes forming certain cells, flanging along the sheet contour, forming a stiffening belt 14 of the screen 12. Actually the screen 12 can also be made of insulating material with a conductive layer on the outer surface.

 The screen 12 is fixed to the support 1 and is electrically connected to the grounding circuit 11 of the substation also in the usual way. The connecting wires 10 between the fuse-disconnectors 5 and the power transformer 6 at the same time bend around the screen 12, as well as the support 1 at the required insulation distance, determined by the higher voltage of the substation.

 This design allows the pole (mast) substation to be reduced in size by placing the fuse-disconnectors 5 on the same support as the transformer 6, and separating the upper contacts of the fuse-disconnectors 5 and the lead wires 9 (which remain energized when the fuse-disconnectors are disconnected 5), from transformer 6 and low-voltage wires 15 to consumers with a grounded mesh screen 12.

 Substations on one support of this design can be performed at least with a low material consumption, for power up to 100 kVA, quite simple, compact and reliable.

 If it is necessary to inspect the power transformer 6 and other equipment, the load of the substation is disconnected (using the switching equipment located in the low voltage device 7), and then the fuses-disconnectors 5. This ensures the necessary safety, as a mesh grounded shield 12 separates the high voltage top contacts of the fuse disconnectors 5 and the lead wire 9 from the accidental contact of the operating personnel, acting as a guard (accidentally touching the grounded shield 12 is not dangerous). Also, the normal operation of neighboring circuits connected to the same supply line as the pole (mast) substation is not disturbed. Indicated in the aggregate provides high reliability of the substation. The absence of the screen 12 would necessitate a significant assignment of fuses-disconnectors 5 from the support 1, which would increase the dimensions of the substation, the material consumption of the fastening metal structures, the load on the support and reduce the reliability of the substation, while the proper safety of the maintenance personnel would not be ensured.

 In FIG. Figures 3 and 4 show a substation on two supports, with a transformer of greater power and, as a result, of greater mass. According to this scheme, substations with a capacity of up to 630 kVA can be implemented with the necessary reliability. The operation of such a substation is similar to that of the substation shown in FIG. 1 and 2.

 The protective screen 12 can be installed with its lower stiffening belt 14 on the traverse 4 of the fastening of the fuse-disconnectors 5, which allows the stiffening belt to be made lightweight. In addition, the fuses-disconnectors 5 themselves can be installed on the lower stiffness belt of the protective shield 12, which allows to simplify the design of the substation, because there is no need to install a separate traverse 5 for fuse disconnectors 4.

Sources of information:
1. Technical specifications TU 3412-001-00468683-93 (IVEZH.674821.001 TU) "Transformer mast substations of 10 / 0.4 kV with a power of 25-250 kVA of the PTMP and PTMA series" (agreed by RAO "UES of Russia", approved by ELVO JSC "), 1993

 2. Typical design of OTP.С.03.61.36-94. Transformer substation with a voltage of 10 / 0.4 kV pole type with a capacity of 25 to 100 kVA (Saratov Plant "Progress"), Moscow, Institute "Selenergoproekt", 1994

Claims (3)

 1. A pillar (mast) transformer substation containing at least one support on which fuses are disconnected, on the traverses are lead insulators, a power transformer, surge suppressors and a low voltage device connected by wires, an earthing circuit, characterized in that it is equipped with a protective conductive screen with a loop stiffener installed between the power transformer and the fuse-disconnectors and electrically connected to the grounding con round, and the connecting wires between the fuse-disconnectors and the power transformer are located from the protective conductive screen and supports at the required insulation distance.  2. The substation according to claim 1, characterized in that the protective conductive screen is mounted on a traverse on which fuses are disconnected.  3. The substation according to claim 1, characterized in that the fuse-disconnectors are installed on the lower stiffness belt of the protective conductive screen mounted on the support.

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