SU1070638A1 - Complete high-voltage transformer substation - Google Patents

Description

The invention relates to electrical engineering and can be used in the construction of high-voltage substations in an open installation. A complete transformer substation is known, including a power transformer with switching devices embedded in its higher voltage inputs, a disconnector, a short circuit breaker and a SI arrester. Installation of such a substation at the installation site is labor-intensive and material-intensive, j The closest to the pre-fit to the technical essence and the achieved result is complete transformer substation containing a power transformer and switchgears of high and low voltages, moreover, Low voltage apparatus is connected to the windings of the power transformer leading conductors, mounted on the supporting devices. The equipment of the lower voltage switchgear is mounted in indoor cabinets (for closed switchgears) and C23 outdoor installations that are separate from the transformer. For well-known substations, a large installation area is required, as well as a significant amount of installation and construction work during their construction. The purpose of the invention is to reduce the hectare of barites, increase the reliability of work, reduce material consumption and simplify installation at the installation site by increasing the degree of factory readiness. This goal is achieved by the fact that a high-voltage transformer substation, containing a cell of a high-voltage power transformer with undervoltage windings, and a low-voltage switchgear with vicatom elements with contacts of lower-voltage connections, is equipped with sets of feed-through insulators fixed contacts according to the number of low voltage connections and is located in one housing divided by a vertical partition into two compartments, in one Of these, a high-voltage power transformer is located, and another is a low-voltage switchgear, the sets of bushing insulators are placed on a vertical partition, the fixed contacts are placed on bushing insulators from a low-voltage switchgear, and the windings of lower the voltage of the power high-voltage transformer is parallel-. but are interconnected by insulated current-carrying contacts and are connected to sets of pass-through insulators. FIG. 1 schematically shows a complete transformer substation, a general view, in FIG. 2 is a view along arrow A in FIG. 1 / in FIG. 3 is a section BB in FIG. 2; in fig. 4 shows a section B-B in FIG. 3, in FIG. 5-complete transformer substation, top view; in fig. b - section GG in fig. five; in fig. 7 -.schema electrical connections complete transformer substation. The device contains {FIG. 1) case 1, made in the form of a metal box divided by a hermetic partition 2 into two compartments 3 and 4. The core 3 and the windings of the power transformer 5 are mounted in the compartment 3, which, through the input of the higher voltage with the built-in switching unit 7 (power switch or load switch or separator) and short circuit switch 8 are connected to discharger 9 mounted on housing 1, and through disconnector 10 to air line 11 of high voltage transmission. Three-phase sets of bushing insulators 12 are installed into the hermetic septum 2 according to the number of low-voltage connections (Fig. 2-4), which are determined by the specified transformer power. From the side of the sealed compartment 3, the bushing insulators 12 are connected to the low voltage winding pins of the power transformer and in parallel with each other by insulated conductors 13. From the compartment 4 side, the specified insulators 12 are connected through the detachable contacts 14 to the inputs of drawback connectors 15-21 of the lower voltage power transformer (Fig. 5-7), which contain a switch, current transformers, relay protection and control elements, a transformer of its own consumption, and a voltage transformer with arresters. Connections 15-19 are connected via detachable contacts 22 (Fig. 1.4) to subscriber cables 23 of the outgoing lines 24-28 (Fig. 7). Compartment 4 is made in the form of a cell structure with a service corridor 29 into which elements of low voltage connections 15-21 mounted on withdrawable trucks are moved from cells for inspection or repair. The service corridor 29 is provided with a door-30 connector. A relay protection and automation device for outgoing lines 24–28 (6–10 kV) is located in cabinets 31–3, respectively, above the withdrawable trolleys with connection elements 15–19 of lower voltage. Above the relay protection cabinet 31-35 is located cells 36-38 with a source of operating current, communication equipment, and relay protection equipment of the power supply transformer 5, respectively. . The cell 39 above the withdrawable elements of the connections 20 and 21 is allocated for the needs of operation. The output of subscriber cables 23 is carried out through the compartment of power cables 40 and cable channel 41. It is most efficient to use a substation with a capacity of 10 mV with four outgoing lines (10 kV). If it is necessary to increase the power, a number of substations are installed from the second. In input 6 of the higher voltage of a power transformer 5 with a voltage of, for example, 110 kV, it is best to install switch-disconnectors 7 with a rated current of 800-1000 A. Constructive execution of a complete transformer substation will be performed more fully ready. The detachable contacts 14 are made in the form of sockets or knives mounted on the hermetic partition 2 of the housing 1, and connected to the draw-out elements of the connections 15-21 of the lower voltage of the power transformer. The power of the power transformer 5 is in accordance with the number of outgoing lines 24-28 (6-10 kV), which, regardless of their performance (air or cable), have a cable output from the substation. The absence of a common input switch and lower voltage busbars significantly increases the reliability of the proposed substation and reduces its consumption of materials. In this case, the short-circuit current when the switch of any power supply line 24-28 fails in an emergency is turned off by the load switch 7. The substation’s compactness is also achieved due to the absence of low voltage busbars and a low-voltage breaker, which requires considerable installation pressure. space for accommodation. The transformer substation, made closed in the housing, is factory-installed on the foundation at the installation site, after which it remains only to connect the substation to a power line of 1.10-220 kV, to install surge arresters 9 and disconnectors 10 high voltage at the input 6 of the higher voltage connect subscriber cables 23 outgoing low voltage lines, which requires a minimum. labor costs when switching substation into operation.

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Claims (1)

COMPLETE HIGH VOLTAGE TRANSFORMER SUBSTATION, containing a cell of a high-voltage power transformer with leads of low voltage windings and a complete switchgear of low voltage with withdrawable elements with input contacts for low voltage connections, characterized in that, p. In order to reduce dimensions, increase reliability, reduce material consumption and simplify installation, it is equipped with sets of bushing insulators with fixed contacts according to the number of low-voltage connections and is placed in one housing divided by a vertical partition into two compartments, one of which contains a high-voltage power transformer, and in ^: another - a complete low-voltage switchgear; moreover, sets of bushing insulators are placed on a vertical partition, fixed contacts are placed on bushing insulators from the side of the complete low-voltage switchgear, and the low-voltage windings of the power high-voltage transformer are parallel connected to each other by ~ isolated current conductors and connected to sets of bushing insulators. Φυι.ί