JPS5951507A - Split type transformer - Google Patents

Abstract

PURPOSE:To make the assembly of a transformer easier and improve the stability of insulation by a method wherein a plurality of unit transformers are connected in parallel to compose one single-phase transformer and three such single- phase transformers are arranged to compose one three-phase transformer and the transformer is connected to a gas-insulated bus-bar. CONSTITUTION:A high voltage connecting lead 14 and a medium voltage connecting lead 15 of each unit transformer are connected to a high voltage bushing 16 and a medium voltage bushing 17 provided to the longitudinal end of each unit transformer along its longitudinal direction through a high voltage lead duct 28 and a medium voltage lead duct 29 respectively. A tertiary lead and a neutral lead are connected to a loaded voltage regulator 6AB provided to the side of the tank along the longitudinal direction through a low voltage lead duct 30 provided on top of the unit transformers opposite to the high voltage lead duct 28. The high voltage bushing 16 and the medium voltage bushing 17 are placed in a high voltage bushing pocket 31 and a medium voltage bushing pocket 32 attached to the sides of the tank respectively. With this constitution, a degree of freedom of the attaching direction of the bushing is increased and it is effective for saving a space of a substation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-phase transformer consisting of a plurality of unit transformers, which has an improved lead drawer structure and an improved layout within a substation.

[Technical background of the invention and its problems]

In recent years, as the demand for electricity has increased, there has been a trend to increase the transmission voltage in order to reduce power loss and transmit power efficiently. Currently, power transmission with a nominal voltage of 1000 kV is planned, and various ultra-high voltage electrical equipment to be used for this purpose are being developed. In response to this, various improvements have been made to transformers, but compared to the conventional largest 500kV class normal voltage transformers,
Since both the pressure and capacity will be approximately doubled, a dramatic improvement is required.

Also, the change to install this transformer 'ilt, J')i'
The current location of 50 is due to divine reasons such as the mountainous Meo area.
It is thought that the situation will deteriorate even more than at 0kV power transmission substations, resulting in many transportation restrictions. Therefore, it is necessary to divide the transformer more than the conventional three-phase transformer system in which each phase is divided. There.

Currently, so-called split-type transformers, in which a single-phase transformer is further divided into a plurality of unit transformers, are being considered.

FIG. 1 is a wiring diagram of a group phase transformer related to a conventional split type transformer. The single-phase transformer consists of two unit transformers JA and IB, each unit transformer 7A.

Each IB is attached with a load voltage regulator 3 and 3B. Each unit transformer IA, IB has high voltage (series) winding 1
It has a medium voltage (shunt) winding 12 and a low voltage (tertiary) winding 13, and the high voltage winding 11 and medium voltage winding 12 of each transformer 7A and 7B are connected to a high voltage lead 14 and a medium voltage girder 1. 15 are connected in parallel and connected to a high pressure bushing 16 and an intermediate pressure bushing 17, respectively.

Further, in the load dark voltage ill regulator 3, '3B is an excitation winding 18 connected in parallel to the low voltage winding 13, and the medium voltage winding 12.
Tap winding 19 connected in series with T, F winding 1L
It has a tap changer 20 for changing the tag of i119,
The parallel connected low voltage winding 13 and excitation winding 18 of each unit transformer are tertiary shushing 21 A s r 21
A 2 : 21 B 1r21B2 are respectively connected, and the tap changer 20 is connected to the neutral point air bushing 22A.
, 22B, respectively.

The configuration of a single-phase transformer connected in this manner is shown in FIG. 2. Each unit transformer JA, IB constituting a single-phase transformer includes a tank 23, an iron core 24 disposed within this tank 23, and the high voltage winding 11 wound around the main leg of this iron core 24.
The winding 25 is composed of a medium voltage winding 12 and a low voltage winding 13.

The high voltage lead 14 and medium voltage lead 15 of each unit transformer 7A and IB are connected to each unit transformer JA.

A high-voltage lead duct 26 and a medium-voltage lead duct constitute a convex framework by connecting the parts on the mutually opposing longitudinal sides of the IB at a height approximately equal to the height position of the center of gravity of the unit transformer. 27, one high voltage lead 14 rises upward from there and is connected to one end of the high voltage bushing 16, while the other medium voltage lead 15 extends horizontally outward from the top. It is bent and connected to one end of the medium pressure bushing 17.

Load voltage regulator 3 attached to each unit transformer JA, 7B
1.3B is a duct connected to the side of tank 23 of each unit transformer 7A, IB), ? A, connected via 2B,
It is arranged so as to sandwich the medium pressure bushing 17 from both sides.

Here, in the case of a UHF transformer, the potential of the high voltage lead 14 is 1000/V3 kV, and the potential of the medium voltage lead 15 is 500/V3 kV.
/〆end kV.

FIG. 3 is a plan view showing an arrangement in which three single-phase transformers shown in FIG. 2 are lined up to form a three-phase transformer. A single-phase transformer U consisting of two unit transformers 7A and IB,
A single-phase transformer v1 made up of two unit transformers IC and ID, and a single-phase transformer W made up of two unit transformers IE and IF are placed with their longitudinal sides facing each other. The bushing 16 and the medium voltage bushing 17 are aligned in the same direction and placed side by side to form a three-phase transformer.

In addition, the connection between the high voltage line, the medium voltage narrow path and the transformer is made by a gas insulated ID wire, and the high voltage bushing 16 and the high voltage gas insulated bus 28 are connected, and the medium voltage shishing 12 and the medium voltage gas insulated bus 29 are connected. has been done. 〃Insulated busbar 28.2
9 are connected to other substation equipment at 1.1 parts opposite to the transformer, respectively.

By the way, the conventional split type transformer configured as described below has the following problems.

(1) Two unit transformers IA and 7B, IC and ID, J or IE and IF are placed side by side, and the high voltage leads are connected in parallel in the high voltage lead duct 26 between them. The structure in which the high-voltage lead 14 is raised requires a T-shaped duct having horizontal and vertical directions, which complicates the structure of the duct, resulting in a weak point in insulation reliability.

(2) On-load voltage regulators 3A to 3F are unit transformers IA
This is economically disadvantageous since it is necessary for each IF to IF.

(3) When assembling the transformer and gas insulated bus 28, 29, the schedule for transporting the transformer is
．． 29, it is not possible to perform each assembly work independently.

(4) If some inconvenience occurs after completion and it is necessary to remove at least one of the unit transformers, the surrounding gas-insulated busbars 28 and 29 will have to be disassembled. Losses may become large due to both economic and economic reasons.

(5) Duct for pulling out high pressure/medium pressure bushings) 2
6.27 is located between unit transformers, which increases the space of the entire substation.

[Purpose of the invention]

The present invention was made to eliminate the drawbacks of the above-mentioned prior art, and consists of connecting a plurality of unit transformers in parallel to form a -C single-phase transformer, and three groups of single-phase transformers are arranged in parallel. When making a three-phase transformer and connecting it to a gas insulated bus,
The object of the present invention is to provide a split transformer that can improve assembly workability, provide insulation stability, and reduce installation space, as well as reduce the length of the gas insulated bus bar.

[Overview of the invention]

In order to achieve this object, the present invention arranges a high-voltage lead duct and an intermediate-voltage lead duct at both ends of different unit transformers arranged in parallel, and The high-pressure bushing and medium-pressure bushing attached to the lead duct are arranged in the longitudinal direction of the tank and in substantially the same direction as each other, either horizontally or at some angle.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a 31z plane view of the split pressure device according to the present invention. The single-phase transformer consists of two unit transformers 5A+5B. Each unit transformer 5Δ, 5B has a tank 23, an iron core 24 disposed in this tank 23, and this iron core 2.
High voltage (series) winding, medium voltage (shunt) wound around the main landing gear of 4
The unit transformers 5A and 5B are arranged in parallel with each other so that their longitudinal sides face each other, and their surroundings are It is surrounded by soundproof walls 4.

High voltage connection lead 14 of each unit transformer 5A, 5B
The medium voltage connection leads 15 are connected to both longitudinal end surfaces of the unit transformers 5A, 5B arranged in parallel via the high voltage lead duct 28 and the medium voltage lead duct 29, respectively, in substantially the same direction as the longitudinal direction. It is connected to the attached high pressure bushing 16 and medium pressure bushing 17.

The high voltage bushing 16 is attached to the side of the tank of one unit transformer 5A in the longitudinal direction of the unit transformer 5A. 1 are attached in the same direction and connected to both unit transformers 5 via high voltage lead ducts 28 to the high voltage connection leads 14 of 5B. The high-voltage bushing 16 is attached to the side surface of the tank of the unit transformer 5B, which is the opposite side of the group of straightened unit transformers, to the side where the medium-voltage bushing 17d and the high-voltage bushing 16 are attached. The multiple unit transformers 5 are installed via medium voltage lead ducts 29 so as to face in approximately the same direction as the unit transformers 5.
It is connected to a 1.5B medium voltage connection lead 15.

The tertiary side lead and the neutral point lead are provided at the top of the unit transformer on the side opposite to the side where the high voltage lead duct 28 and the medium voltage lead duct 29 are attached to the longitudinal side of the tank of the unit transformer] ° Via duct 3.0,
The high-voltage bushing 16 and medium-voltage bushing 17 are connected to the pressure regulator 6AB, which is installed near the middle side of the tank of the unit transformer 5A. , 5B are provided in a high pressure bushing ticket 31 and a medium pressure bushing pocket 32 that are cut into the side of the tank.

FIG. 5 is a plan view showing an arrangement in which three split transformers according to the present invention are arranged in parallel to form a three-phase one-puncture system. In FIG. 5, there are two unit transformers 5, a single-phase transformer 01 made up of 5B, a single-phase transformer v1 made up of 2 unit transformers 5C and 5D, and two unit transformers 5E.
15F are arranged side by side with the longitudinal sides of the tank of each unit transformer facing each other, with the high-voltage bushing pocket 31 and the medium-voltage bushing pocket 32 aligned in substantially the same direction. , transformers 5A, 5B, and 5C of each year that constitute a three-phase transformer
and 5D.

Connections between 5E and 5F and other substation equipment are made by gas-insulated busbars, and the high-voltage gas-insulated busbar 33 is connected to the medium-voltage gas-insulated busbar in the high-voltage bushing pocket 3 of each single-phase transformer U, V, and W. 34 are connected to the medium voltage bushing pockets 32 of each single phase transformer U, V, W, respectively. At this time, the high voltage gas insulated bus 33 and the medium voltage gas insulated bus 34 of the same phase are arranged facing in opposite directions without intersecting with each other.

In the split type transformer according to the present invention in which 411 is constructed in this manner, the following effects of qLii can be obtained.

(1) Since the high voltage bushing 16 and medium voltage bushing pulls are pulled out from 5B to separate unit transformers 5 in the same phase, the degree of freedom in mounting the high voltage bushing 16 and medium voltage bushing 17 is increased in the direction. This is effective in saving space in the entire substation, including the gas-insulated busbar.

(2) 5B are lined up in the same direction in the 111th transformer 5 for each phase, and the high voltage bushing 16 and the medium voltage bushing 1
Since the pull-out direction of 7 is the same as -1, the connection between bushing 16.17 and gas insulated bus bar 33.34,
Assembly of gas insulated busbars 33°34 and unit transformer 5fi,
, 5H assembly can be performed completely independently.

Tsu-! f,,a If each unit transformer 5 is provided with a road on the opposite side to the direction in which the bushing is pulled out from 5B, it is possible to easily carry in and out 5B to and from each unit transformer 5,
Furthermore, even if a unit transformer is to be removed due to some inconvenience when the entire unit is completed, the gas insulated bus 3
Move s r s 4 at all without moving ) 91 bodies,
The ducts such as the high-voltage lead duct 28 and the medium-voltage lead duct 29 have the advantage that they can be worked independently on the transformer side with only soot.

(3) Since the neutral point and low voltage leads can be pulled out from the opposite side in the longitudinal direction of the unit transformer with respect to the pull-out side of the high voltage and medium voltage leads 14 and 15, each unit transformer 5 has a It becomes easy to draw out the voltage from each winding, and the connection with the on-load voltage regulator 6AB becomes easy.

(4) The neutral point and low voltage lead are each unit transformer 5A,
5B through the upper common duct 30, a large number of leads can be connected at once through the common duct 30, which improves work efficiency and also connects the on-load voltage regulators 6AB, 6.
Only 91 CDs or 6EFs are required, which is economical and space efficient.

(5) In single-phase transformers U, V, and W configured by arranging multiple transformers 5A to 5F, high-voltage bushing 1
6. The medium pressure bushings 17 are located on opposite sides, and the gas insulated busbars 33.34 connected to these high and medium pressure bushings 16.17 are also arranged facing opposite to each other. Since it is connected to the switchgear, the length of the gas insulated busbars 33, 34 can be minimized, which is not only economically advantageous, but also increases the reliability of the insulation.

Further, in the above embodiment of the present invention, a case has been described in which the high-pressure bushing 16 and the low-pressure bushing 17 are connected to the gas-insulated bus bar 33, 34, but the present invention is not limited to this, and the gas-insulated switchgear is connected to these There is no requirement that the tank of the unit transformer directly connected to the unit transformer be at an accurate angle in the longitudinal or horizontal direction or horizontally; for example, in order to minimize the connection space with the gas-insulated busbar, Consideration R1: It is also possible to have some angle in the horizontal or vertical direction.

〔Effect of the invention〕

As described above, according to the present invention, the high-voltage IJ-doduct and the medium-voltage lead duct are arranged and provided on the side surface of the tank of each different unit transformer in the same phase, and the high-voltage lead duct and the medium-voltage lead duct The high-pressure bushings and medium-pressure bushings that are attached to the tank are arranged horizontally or at a slight angle in the longitudinal direction of the tank and in almost the same direction as each other, reducing the installation space, improving work efficiency, and The 4JL can provide an economically advantageous split-type transformer that can reduce the length of the insulated bus bar.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram of a conventional split-type transformer, Figure 2 is a plan view showing the configuration of a conventional split-type transformer, and Figure 3 is a three-phase, one-bank configuration of the split-type transformer shown in Figure 2. FIG. 4 is a plan view showing an embodiment of the split type transformer according to the present invention, and FIG. FIG. 58-51'...Unit transformer, 6AB, 6CD. 6EF...1. ii:! Voltage regulator at J, 1st...
High voltage (series) winding, 12... Medium voltage (shunt) winding, 13
...Low voltage (tertiary) right side h 14...High voltage lead,
15... Medium pressure lead, 16... High pressure bushing, 1
7... Medium pressure bushing, 23... Tank, 24...
・Iron core, 25...Winding, 28...High pressure lead duct, 27...Medium pressure lead duct, 30...Low pressure lead duct, 3...High pressure bushing duct, 32...
Medium pressure bushing duct, 33.34...Gas insulated busbar Figure 7 Figure 2 Figure 3?

Claims (1)

[Claims] A plurality of unit transformers each having a tank, an iron core disposed in the tank, and high-voltage windings, medium-voltage windings, and low-voltage windings wound around the iron core are arranged side by side, and each unit transformer has a high-voltage winding. In a split type transformer in which the wire and medium voltage winding are connected to the high voltage bushing and medium voltage bushing through the high voltage lead and medium voltage lead through the high voltage lead duct and medium voltage lead duct, respectively, the high voltage bushing and the medium voltage bushing are connected to the same phase. The high-pressure bushing and the medium-pressure bushing are arranged on the longitudinal side of the tank at both ends of the different unit transformers installed in parallel, and the high-pressure bushing and medium-pressure bushing are arranged in the longitudinal direction of the tank and in substantially the same direction as each other. A split type transformer characterized by being arranged horizontally or at a slight angle toward the direction.