RU2164049C1 - Metal-clad transformer substation - Google Patents

Abstract

FIELD: power supply mains of industrial enterprises. SUBSTANCE: substation has lead-in device on high-voltage side, collecting buses, power transformer, and low-voltage switch-gear. It also incorporates lead-in and line panels mounting circuit- opening and protective devices, ON-operation mechanisms, electricity meters, measuring instruments, and control equipment. Low-voltage switch-gear is assembled of lead-in and line panels with two face sides and common rear side mounted in double-row board. So, stationary circuit-opening and protective devices are equally elevated for easy access to them within size of double-row board as viewed from top. Collecting buses are mounted above boards along each row to form two groups interconnected through jumpers. Installation of low-voltage switch-gear does not require changing the design and arrangement of building components. EFFECT: simplified design, reduced metal input and labor consumption, improved reliability of substation. 5 cl

Description

 The invention relates to objects of industrial construction and is intended for the reception, conversion and distribution of electrical energy of three-phase alternating current with an industrial frequency of 50 Hz in power networks of industrial enterprises.

 Known complete transformer substation (see the book of L.N. Baptidanov and V.I. Tarasov "Electrical equipment of electric stations and substations" in 2 volumes, volume 2, SEI, M.-L. 1959, p. 150 ... 152, Fig. 9-8).

 Known complete transformer substation indoor installation (see book "Electrical reference book (in three volumes), t. 2," Electrical devices ". / Under the general editorship of MEI V.G. Gerasimov, P. G. Grudinsky, L. A. Zhukova et al. 6th ed. Rev. And add. - M., Energoizdat, 1981, - 640 p., P. 534 ... 539, fig. 25-19), produced by the Chirchik transformer plant.

 Known complete transformer substation according to TU 16-674.029-84 (IBDSH. 674822.018TU) (see annual industry catalogs, for example, "Electrical Engineering" 03.61.23-95, M., Informelectro, 1995 (105037, M.E.- 37 Informelectro), also produced by the Chirchik Transformer Plant.

 The design of these substations includes a device on the high-voltage side, a power transformer, current leads, a metering cabinet with metering devices, a switchgear on the low-voltage side, including input, sectional and linear cabinets installed to each other in a common panel, forming a common front and rear sides . Cabinets consist of cells located one above the other in the height of the cabinet, in which switching and protective devices are installed on the sliding carriages (not shown), and the busbars are mounted on the back of the switchboard. The carriages on the back side are equipped with cutting contacts for switching on and off switching and protective devices and other devices placed on the carriage.

 Known transformer substation complete reception, conversion and distribution of electrical energy (see the book by L. I. Dvoskin "Layout and design of high voltage switchgear", SEI, M. 1960, S. 360-369, Fig. 4-83, 4-84, 4-85), containing an input device from the high voltage side, including input and line panels with switching and protective devices, switching drives, metering devices and instrumentation, control devices, busbars.

 This design of a low voltage switchgear is cumbersome, complex, metal intensive and time consuming. To carry out repairs, you must first remove the carriage from the cell with the devices and devices installed on it and then remove it all down. While the weight of the carriage with the devices is about 50 kg, one electrician on duty cannot manually remove this carriage with the devices. Moreover, if the carriage is located at the very top of the cabinet - at a height of two meters, even together to remove such a weight from a height of one and a half to two meters is quite laborious. Installing the carriage in the cell is also a time-consuming operation, and in order to determine that the cut-in contact of the carriage is reliably engaged with the contact lips of the outgoing lines, it is necessary to visually verify this from the back of the low voltage switchgear. If the contacts are not aligned or are skewed due to the gap between the frames and the guides, the carriage is again rolled out, shifted to one side or the other and rolled again, also visually monitoring the reliability of the contact of the device connection. Moreover, if the cell in which the carriage is installed is located at the very top, then for visual control of the reliability of the contact, it is necessary to go from the back with the ladder. With poor contact, the contacts burn up and quickly fail, which reduces the durability and reliability of the work. A large number of parts, rubbing surfaces in the kinematics of carriages makes the design metal-intensive, time-consuming and not sufficiently reliable.

 The aim of the invention is to simplify the design, reduce metal consumption and complexity, increase reliability without changing the construction part for the installation of a low voltage switchgear.

 To achieve this goal, the complete transformer substation contains an input device from the high voltage side, a power transformer, a low voltage switchgear, including input and line panels with switching and protective devices, switching drives, metering devices and instrumentation, control devices, busbars .

 The low-voltage switchgear is made in the form of lead-in and linear panels installed in a double-row switchboard with two front sides and a common rear side with stationary switching and protective devices located at the same level, with the possibility of free access to them within the switchboard dimension in plan, moreover busbars are placed above the shield along each row, forming two groups interconnected by jumpers.

 A low voltage device is installed between power transformers with the possibility of electrical connection from each of them via busbar busbar systems and is equipped with a reserve switching device, consisting of a section panel and an automatic reserve switching panel, the transformer is made on the side of the low voltage device and is protected by a metal casing.

 The handles of the actuators, metering devices, control devices and instrumentation are installed on the front sides of the low voltage device.

 Input devices with power transformers on the high voltage side are installed in pairs in two rows in plan.

 The implementation of the low voltage device in the form of lead-in, sectional and linear panels of the ShchO-94 type installed in a double-row shield with two front sides and a common rear side with stationary switching and protective devices located at the same level with the possibility of free access to them within the shield in terms of, allows to simplify the design of the low voltage device, to increase reliability during operation.

 The use of SchO-94 type panels with switching and protective devices of stationary design as input, sectional, and linear cabinets in a low-voltage device provides rigid, constant and reliable contacts between all elements of the device’s electrical circuit with visible control of the device’s current conductors from the front side.

 During operation, there is no need to use retractable heavily loaded carriages with unreliable kinematics, which for rolling out should be rolled out, removed from a high height and placed somewhere for repair, and then raised again to the same height and rolled into a cell, while controlling on the back, the reliability of contact of circuit breakers with busbars and outgoing lines. The location of the input, sectional and linear panels to each other with the back and sides allows you to assemble them into one shield with two front sides and one back, which provides simplicity and reliability of the design, unhindered access during operation to all devices and elements of the low voltage device with the front sides within the dimensions of the device in plan. Moreover, the dimensions of the low-voltage device are fully consistent with the dimensions of the building building of existing substations, manufactured, for example, by the Chirchik plant, which allows us not to change the construction task during the design of the substation and, if necessary, ensure interchangeability of low-voltage devices at existing substations. It is the proposed design of the substation that more closely meets the safety requirements.

 Placing busbars above the shield of each row of panels, forming two groups interconnected by jumpers, allows you to create a compact design of a low-voltage device without changing the building task from panels, for example, SchO-94 type with fixed-mode switching and protective devices.

 Equipping the substation with a reserve switching device, consisting of a sectional panel and an automatic reserve switching panel, allows developing and operating schemes of two-transformer substations, where a low-voltage device is installed between power transformers with the possibility of electrical communication from each of them via a busbar, and in case of power loss on one of transformers of the automatic transfer switch to provide uninterrupted power to consumers from the second transformer.

 The implementation of the busbar bridge on the side of the low voltage device from the side to the terminals of the power transformer and its protection with a metal casing can provide safe operating conditions.

 Placement on the front sides of the low voltage device of the handles of the actuators, metering devices, control devices and instrumentation allows remote control of devices and visual control of the substation from the front side of the low voltage device.

 The installation in pairs in two rows in terms of input devices with power transformers for two-transformer substations allows for a compact substation circuit, as an option for its implementation.

 In FIG. 1 shows a front view of the proposed single-transformer substation.

 In FIG. 2 shows a plan view of the proposed single-transformer substation.

 In FIG. 3 shows a front view of a two-transformer substation.

 In FIG. 4 shows a plan view of a two-transformer substation.

 In FIG. 5 is a view A of a low voltage device (side wall not shown).

 The substation contains an input device 1 on the high-voltage side, a power transformer 2, a low-voltage switchgear 3, including input 4, section 5 and line 6 panels with switching 7 and protective 8 devices, switching drives 9, metering devices 10, and control and measuring 11 devices, control devices 12, precast 13 tires. The low-voltage device 3 is made in the form of input 4, section 5 and linear 6 panels installed in a double-row shield 14 with two front sides 15 and a common rear side 16 with switching 7 and protective 8 stationary devices located at the same level with the possibility of free access to them access within the size of the shield 14 in the plan, and the busbar 13 is placed above the shield 14 along each row, forming two groups interconnected by jumpers 17. In two-transformer substations, the device 3 is low th voltage established between power transformers 2, with the electrical connection from each of them through the busbar 18, and is equipped with transfer switch (not shown) consisting of the sectional panels and automatic switches. The bus bridge 18 on the side of the low voltage device 3 to the terminals of the power transformer 2 is made on the lateral side 19 of the low voltage device 3 and is protected by a metal casing 20. The handles 21 of the drive 9 of inclusion, metering devices 10, control devices 12 and instrumentation 11 are installed with front sides 15 of the device 3 low voltage. With a two-row arrangement of two-transformer substations, the input devices 1 from the high voltage side with power transformers 2 are installed in pairs in two rows in a plan.

 The proposed substation operates as follows.

 The power supply of the complete transformer substation is carried out according to the main and radial power supply schemes. As an input device for 6 kV, for example, a KSO 386-0.4-0.6-20UZ camera with a load break switch VNP 10 / 400-20UZ and fuses of the PKT-103-80-20UZ type is installed. Input from the power transformer 2 to the bus 18 (0.4 kV) is carried out through the input panel 4, for example, ЩО-94-1-43УЗ. Protection of busbars 13 on the low voltage side is carried out by switches 8 (VA 51-41-341830UZ). The distribution of electric energy along the outgoing lines, as well as the protection of the outgoing lines from overload and short circuit currents, is carried out by stationary circuit breakers of the 8th series of VA stationary version or circuit breaker-fuse blocks.

 The shield 14 (0.4 kV) is equipped with panels 4, 5, 6 of the ShchO-94 series. The location of the shield 14 is two-row. With two-transformer substations, the low voltage device 3 is equipped with an automatic transfer switch (not shown). In normal mode, a section switch (not shown) is turned off. Each section is powered by its input device 1 and transformer 2. When the voltage disappears on any of the input devices 1 using the automatic transfer switch, a section switch (not shown) is turned on and the entire substation is powered by the input device 1 and transformer 2 remaining in operation. When voltage is restored on the disconnected input device 1, the sectional switch automatically turns off, and the substation continues to operate in normal mode. The electricity metering is carried out on the side of the low voltage device 3. To account for active and reactive energy, load measurement at all input phases, counters 10 (SA4U-I672: SR4U-I672), ammeters 11 (E-365 connected via current transformers) were installed.

 The introduction of the proposed substation will reduce metal consumption and labor intensity, simplify the design, ensure compactness and increase its reliability. Moreover, the dimensions in terms of the proposed substation allow full interchangeability of the failed low voltage device, made, for example, according to the type of the Chirchik plant, to the low voltage device of the proposed design.

Claims (5)

 1. Complete transformer substation for receiving, converting and distributing electric energy, comprising an input device from the high voltage side, a power transformer, a low voltage switchgear, including input and line panels with switching and protective devices, switching drives, metering devices, and instrumentation , control devices, busbars, characterized in that the low voltage switchgear is designed as installed in two-row front and back panels with two front sides and a common rear side, equipped with fixed-mode switching and protective devices located at the same level with the possibility of free access to them within the double-row shield dimensions in plan, with busbars placed above the double-row shield along each row, forming two groups interconnected by jumpers.  2. The substation according to claim 1, characterized in that, with two power transformers, a low voltage switchgear is installed between the power transformers with the possibility of electrical communication from each of them via a busbar and is equipped with a reserve enable device consisting of a sectional panel and an automatic reserve enable panel.  3. The substation according to claim 1, characterized in that the busbar from the terminals of the power transformer to the low voltage switchgear is made on the side of the low voltage switchgear and is protected by a metal casing.  4. The substation according to claim 1, characterized in that the handles of the switching drives, metering devices, control devices and instrumentation are installed on the front sides of the low voltage switchgear.  5. The substation according to claim 1 or 2, characterized in that with two power transformers, the input devices from the high voltage side with power transformers are installed in pairs in two rows in plan.

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