JPS6226563B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-phase transformer, in particular two
This invention relates to high-voltage lead ducts and low-voltage lead ducts in single-phase transformers consisting of two unit transformers.

In view of the recent electricity situation, the power generation capacity of power plants has been increasing. Due to this increase in power generation capacity, multiple generators may be installed, but since the single unit capacity of the transformers connected to these generators also increases, they are usually divided into three generators for each phase. What constitutes a phase transformer is adopted.

However, transportation conditions have become increasingly severe in recent years as the location conditions for power plants and substations have deteriorated, and even if the three-phase transformer is divided into each phase as described above, the single-phase transformer itself is becoming smaller due to the increase in power generation capacity. The reality is that they have become larger, creating transportation problems. For this reason, a so-called split-type transformer, in which a single-phase transformer is further divided into a plurality of unit transformers, is used to solve transportation problems.

By the way, in such a single-phase transformer consisting of a plurality of unit transformers, as shown in FIG. Connect to duct 2
The on-load voltage regulators 3A and 3B, which are connected separately via A and 2B, are arranged side by side with their longitudinal sides facing each other, and each unit transformer 1A and 1B is surrounded by a soundproof wall 4. It's covered. Further, the high voltage winding and low voltage winding (not shown) of each unit transformer 1A, 1B are installed in a high voltage lead duct 5 and a low voltage lead duct 6 disposed above the tank of each unit transformer 1A, 1B. , are connected in parallel through high-voltage connection leads and low-voltage connection leads (not shown), and are drawn out to the outside of the soundproof wall 4 via high-pressure air bushings 7 and low-pressure air bushings 8, and further connected to each unit transformer 1A, 1B. The tertiary winding (not shown) is connected to the tertiary connection lead (not shown) and the tertiary air bushing 9 protruding from the top of the tank.
A ₁ , 9A ₂ ; Extracted to the outside of the soundproof wall 4 via 9B ₁ , 9B ₂ . Note that 10A and 10B are neutral point air bushings protruding from the upper surface of each on-load voltage regulator 3A and 3B.

As described above, in the conventional split type single-phase transformer, the high voltage lead duct 5, the low voltage lead duct 6, the high pressure air bushing 7, the low pressure air bushing 8, and the tertiary air bushing 9A ₁ , 9A ₂ ; 9B ₁ , 9B ₂ was installed above the transformer, so there was a problem with its inferior seismic strength. Further, if these lead ducts and bushings are arranged at a lower position of the transformer in consideration of seismic strength, a problem arises in that the installation area increases.

The purpose of the present invention is to solve the above-mentioned problems of the prior art, to improve seismic strength without significantly increasing the installation area, and to significantly improve the mechanical strength of the joint between the high-voltage lead duct and the high-voltage connection duct. The purpose is to provide a split-type single-phase transformer that can be used.

In order to achieve this object, the present invention connects mutually opposing sides of tanks in unit transformers arranged in parallel constituting a single-phase transformer by a high-voltage lead duct and a low-voltage lead duct. In addition to constructing a framework, one end of a horizontally extending high-voltage connection duct that houses a high-voltage bushing is connected above the high-voltage lead duct, and the high-voltage connection lead is raised and connected to the high-voltage bushing. A feature is that part of the weight is carried by a high-pressure lead duct.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 2 is a wiring diagram of a single-phase transformer according to an embodiment of the present invention. A single phase transformer consists of two unit transformers 1
Each unit transformer 1A, 1B is attached with a load voltage regulator 3A, 3B, respectively. Each unit transformer 1A, 1B has a series (high voltage) winding 11, a shunt (low voltage) winding 12, and a tertiary winding 1.
3, each unit transformer 1A, 1B has a series winding 1
1 and the shunt winding 12 are connected in parallel by a high-voltage connecting lead 14 and a low-voltage connecting lead 15, respectively, and lead to a high-voltage through bushing 16 and a low-voltage through bushing 17.

Each on-load voltage regulator 3A, 3B also includes an excitation winding 18 connected in parallel to the tertiary winding 13, a tap winding 19 connected in series to the shunt winding 12,
The tertiary winding 13 and the excitation winding 18 connected in parallel of each unit transformer have tertiary through bushings 21A ₁ , 21A ₂ ; 21B ₁ , 21B _{2 .} and the tap changer 20 is led to neutral point air bushings 22A and 22B, respectively.

The configuration of a single-phase transformer connected in this manner is shown in FIGS. 3 and 4. The unit transformers 1A and 1B constituting the single-phase transformer are arranged in parallel so that their longitudinal sides face each other, and are covered with a soundproof wall 4. Each unit transformer 1A, 1B has a tank 23,
An iron core 24 disposed within this tank 23, and the series winding 1 wound around the main leg of this iron core 24.
1, a winding 25 consisting of a shunt winding 12 and a tertiary winding 13.

High voltage connection lead 14 of each unit transformer 1A, 1B
and low voltage connection lead 15 for each unit transformer 1
A high-voltage lead duct 26 and a low-voltage lead duct 27 are connected to the opposite sides of the tanks 23 of A and 1B at a height approximately equal to the height of the center of gravity of the unit transformer to form a nearly cross-shaped framework. One high voltage connection lead 14 rises upward from there and is connected to one end of the high voltage through bushing 16, while the other low voltage connection lead 15 extends horizontally outward from there. Low pressure through bushing 17 bent in the direction
connected to one end of the

The high-voltage through bushing 16 and the low-voltage through bushing 17 each extend horizontally parallel to the longitudinal direction of the unit transformer and toward opposite sides, and each has a high-pressure gas insulated bus line at the other end that protrudes outside the soundproof wall 4. 28 conductors 29 and the conductor 32 of the low pressure gas insulated bus bar 31 are connected. The high voltage through bushing 16 arranged in this way has one end connected to the high voltage connection duct 34 above the high voltage lead duct 26, and one end connected to the other end of the high voltage gas insulated bus bar 28. sheath 30
and a low pressure through bushing 17.
Similarly, it is covered by a low-pressure connection duct 35 whose one end is connected to the side of the low-pressure lead duct 27, and a sheath 33 of the low-pressure gas insulated bus bar 31 whose one end is connected to the other end of the low-pressure connection duct 35. It is being said.

On-load voltage regulators 3A and 3B attached to each unit transformer 1A and 1B are respectively connected to the end face of the tank 23 of each unit transformer 1A and 1B via on-load voltage regulator connection ducts 2A and 2B, It is arranged so as to sandwich the low pressure gas insulated bus bar 31 from both sides.

Further, the tertiary through bushings 21A ₁ , 21
A ₂ ; 21B ₁ , 21B ₂ and neutral point air bushings 22A, 22B are connected to each load voltage regulator 3A,
The tertiary through bushings 21A ₁ , 21A ₂ ; 21B ₁ ,
21B ₂ is each tertiary gas insulated busbar 36A ₁ , 36A ₂ ;
They protrude into 36B ₁ and 36B ₂ , respectively.

Shunt winding 12 in each unit transformer 1A, 1B
main body neutral point connection leads 37A, 37B for connecting the neutral point side to the tap winding 19 of the on-load voltage regulators 3A, 3B, and tertiary through bushings 21A ₁ , 21A ₂ ; 21B for connecting the tertiary winding 13 ₁ , 21B ₂ tertiary connection leads 38A ₁ , 38A ₂ ;
38B ₁ , 38B ₂ are connected through main body neutral point through bushings 39A, 39B and tertiary through bushings 40A ₁ , _{40A 2 ;} It is led into the tanks of the on-load voltage regulators 3A and 3B.

According to this embodiment configured in this manner, the following various effects can be obtained.

(1) A nearly double-cross-shaped framework is constructed by connecting the high-voltage lead duct and low-voltage lead duct to the opposite sides of the tank of each unit transformer at a height approximately equal to the height of the center of gravity of the unit transformer. With this configuration, the two unit transformers will work together to stably respond to earthquakes.
The seismic strength of the transformer can be significantly improved.

(2) Since the high-voltage through-butting and low-voltage through-butting are drawn out from the center of the high-voltage lead duct and the low-voltage lead duct, the impact on the rocking of the transformer foundation in the event of an earthquake is reduced, and the support and fixation of the through-butting is reduced. Due to the synergistic effect with the low height of the through bushing, the seismic strength of the through bushing can be significantly improved.

(3) One end of the high-voltage connection duct is placed above the high-pressure lead duct, and part of the weight of the high-voltage connection duct is borne by the high-pressure lead duct, so one end of the high-voltage connection duct is placed on the side of the high-pressure lead duct. Compared to the case where the ducts are connected and supported in a cantilevered manner, the mechanical strength of the connecting portions of these ducts can be significantly improved.

(4) Since one end of the high-voltage connection duct is connected above the high-pressure lead duct, the outward protrusion of the high-pressure gas insulated bus bar is increased by the amount placed above the high-pressure lead duct, compared to the above case of cantilever support. It is possible to shorten the length and reduce the installation area.

(5) Since the high-pressure lead duct and low-pressure lead duct are installed at low positions, the safety of the installation work can be improved.

(6) Tertiary through bushing 21A ₁ , 21A ₂ ; 21
Since B ₁ and 21B ₂ are drawn out from the load voltage regulator located outside the soundproof wall, there is no penetration part of this tertiary through bushing in the soundproof wall, and there is no need to take measures against water leakage and sound leakage in this part.
The height of the bushing pocket can be reduced, earthquake resistance measures can be easily taken, and the transformer can be manufactured at low cost.

(7) Pull out the low-voltage through bushing horizontally and parallel to the longitudinal direction of the transformer tank, and pull out the on-load voltage regulator of each unit transformer from both sides of the low-voltage through bushing at the longitudinal end of the transformer tank. Because it is placed in a sandwiching position, the space between each unit transformer and on-load voltage regulator can be effectively used to easily pull out the low-voltage bushing from a low position, and it has excellent earthquake resistance. Regardless, the increase in installation area is small.

(8) Since the high-voltage through bushing and the low-voltage through bushing are pulled out horizontally parallel to the longitudinal direction of the transformer tank and toward opposite sides, the space between each unit transformer can be effectively utilized to can be easily pulled out from a low position and connected to a gas-insulated busbar, and despite its excellent seismic strength, the installation area does not need to be increased much.

(9) Since the high-voltage connection leads and low-voltage connection leads of each unit transformer were pulled out from mutually opposing sides of the tank of each unit transformer and from mutually opposing positions, each of the corresponding pull-out positions of these connection leads Therefore, the lengths of the high-pressure lead duct and the low-pressure lead duct that are provided across these pull-out positions can be shortened. the result,
These lead ducts can be manufactured at low cost, and the work of connecting high-voltage connection leads and low-voltage connection leads becomes easy.

In the above embodiment, a case was described in which the high voltage through bushing and the low voltage through bushing are connected to the gas insulated bus bar, but the present invention is not limited to this, and the present invention is not limited to this. It can be similarly applied when connecting to an overhead line by using air bushing instead of bushing.

Furthermore, in the above embodiment, the case where an auto-transformer is used as the unit transformer is described, but it can be similarly applied to the case where a three-winding transformer consisting of separate high-voltage, low-voltage, and tertiary windings is used. Of course.

As explained above, according to the present invention, the opposing sides of the tank in each unit transformer are connected by the high-voltage lead duct and the low-voltage lead duct, and a framework is constructed by these, so that it can withstand earthquakes. As a result, the two unit transformers work together in a stable manner, and the seismic strength of this type of transformer can be greatly improved. Moreover, since the high-voltage lead duct and the low-voltage lead duct are installed by effectively utilizing the space between the sides of the tank of each unit transformer, the increase in installation area is relatively small.
Furthermore, one end of the high-voltage connecting duct is placed above the high-voltage lead duct, so that part of the weight of the high-voltage connecting duct is borne by the high-voltage lead duct, which greatly improves the mechanical strength of the joint between these ducts. be able to.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a schematic configuration of a conventional split single-phase transformer, Fig. 2 is a wiring diagram of a single-phase transformer according to an embodiment of the present invention, and Fig. 3 is a diagram of the same single-phase transformer. A partially cutaway plan view, and FIG. 4 is a partially cutaway side view taken along line AA in FIG. 3. 1A, 1B...Unit transformer, 11...Series (high voltage)
Winding, 12... Shunt (low voltage) winding, 26... High voltage lead duct, 27... Low pressure lead duct, 23... Tank, 24... Iron core, 25... Winding.

Claims (1)

[Claims] 1 A unit transformer consisting of an independent tank, an iron core placed in the tank, and high-voltage windings and low-voltage windings wound around this iron core is placed side by side, and the high-voltage winding and low-voltage winding of each unit transformer are The pressure windings are connected in parallel to each other by high-voltage connection leads and low-voltage connection leads drawn out from the tank of each unit transformer into high-voltage lead ducts and low-voltage lead ducts configured separately from these tanks, and high-voltage A connection lead and a low voltage connection lead are connected to a high voltage bushing and a low voltage bushing provided in the high voltage lead duct and the low voltage lead duct, in which the tanks of each unit transformer are connected to each other by the high voltage lead duct and the low voltage lead duct. The opposing sides are connected, and one end of a horizontally extending high voltage connection duct housing a high voltage bushing is connected above the high voltage lead duct, and the high voltage connection lead is raised and connected to the high voltage bushing. A single-phase transformer featuring: