JPS5950511A - Split type transformer - Google Patents

Abstract

PURPOSE:To attain easily and economically the connection of the high voltage leads of a split type trasnformer by a method wherein a connecting duct on the side to connect two unit transformers, and to be connected to a gas-filled bus- bar is provided on the sides of tanks, and another connecting duct is provided on the upper part covers of tanks. CONSTITUTION:The single-phase transformer is constructed of the three unit transformers 1A, 1B, 1C. At this time, the connecting duct 2BC containing a lead out bushing 6 to be connected to the gas-filled bus-bar 7 arranged in space between the unit transformers 1B, 1C is installed nearly at the center of the mutually facing tank sides 9B, 9C of the unit transformers 1B, 1C, and the connecting duct 2AB equipped with no bushing and to connect the high voltage leads of the unit transformers 1A, 1B is provided on the faces of the tank upper part covers 8A, 8B of the unit transformers 1A, 1B to be connected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a split type transformer that is divided into parts due to transportation restrictions, and in particular to a single-phase transformer consisting of three unit transformers arranged in parallel. This invention relates to a structure for pulling out transformer connection leads.

[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. At present, power transmission with a nominal voltage of 1000 kV is planned, and various ultra-high voltage electrical equipment for use in this system are being developed. Various improvements have been made to transformers in response to this trend, but since the voltage and capacity are approximately twice as high as the conventional largest 500kV class transformer, dramatic improvements are required.

Additionally, the location conditions for a substation where this transformer can be installed are likely to be worse than the current 500kV power transmission substation due to the mountainous area, which is quiet and quiet, resulting in many transportation restrictions. Therefore, it is necessary to divide the transformer more than the conventional three-way transformer system in which each phase is divided.

Therefore, currently, the so-called split-type transformer, in which a single-phase transformer is further divided into unit transformers, has been decided based on transportation restrictions such as consideration. The vessel may be divided not only into two parts but also into three parts. In such cases, a duct structure is required that connects the divided unit transformers with connection leads during on-site assembly, and its reliability and economic efficiency remain important issues.

These divided unit transformers are assembled on-site to form each phase transformer, and a 3-phase puncture is formed. Ru. In these transformer punctures,
For example, in the case of two-puncture installation, the high-voltage/medium-voltage leads drawn out from each unit transformer are connected to gas fU lines installed vertically stacked in three or four tiers between both banks.

In cases such as this, and when each phase consists of three in-position transformers, the high voltage leads of each unit transformer are conventionally connected through a duct provided on the side of each unit transformer tank. It is being done. However, in such a configuration, the following problems have occurred.

(1) In the connection between the transformers, the high pressure bushing of the duct connected to the gas bus is pulled out and connected to the gas bus.

In general, other connection ducts sometimes make connection work difficult because the distance between the connected unit transformers is kept as narrow as possible.

(2) Connection ducts that are not connected to the gas bus must be connected after the unit transformer has been installed in advance, so a bellows is required to insert the duct between both coronation transformers, and wide diameter bellows are expensive. Therefore, it was not economical.

(3) As described above, in the conventional configuration, it was not only difficult to remove the connecting ducts, but also the installation area of the entire transformer group could not be minimized, making it uneconomical.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks, makes the installation of the connecting duct between the coronating transformers easy and economical, and provides a divided type that reduces the size of the entire transformer group to l+3. The purpose is to obtain a transformer.

[Summary of the invention]

In order to achieve the above objects, the present invention connects two unit transformers and provides a connection duct on the side of the tank to connect to the gas bus line, and another connection duct on the tank top cover, thereby increasing high voltage. The present invention is characterized in that the lead connection is easy, inexpensive, and economical.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In the one shown in FIGS. 1, 2, and 2, the single-phase transformer is composed of three unit transformers 1, an IB, and an IC. At this time, a connection duct including a single-outlet brace 6 connected to the gas bus 7 placed between the unit transformers IB and IC) A BC
is the opposing tank side 9k of the coronation transformer I B+ i C.

The unit transformer fA is installed approximately in the center of 9B.

Connection duct that cannot be used to connect the bushing that connects the high voltage lead of IB) 2 AB-equipped transformer I A, IB tank earth cover Rk, installed on the 8B side and connected.

In the figure, 3 indicates an LVR, 4 indicates a medium pressure, neutral point connection duct, and 5 indicates a soundproof wall.

In the split type transformer according to the present invention configured as shown in FIGS. 1 and 2, the following effects are produced.

(1) Connection duct 2 AB is the upper cover 8A, 8B
Unit transformer JA because it is installed through the surface.

When installing the connecting duct 2 AB after the IB is installed, the work is not affected even if the distance between the transformers is narrow, making the work easier.

(2) Therefore, since the distance between unit transformers IA and IB can be minimized, the installation area of the entire transformer group can be minimized.

(3) Similarly, fl′, , H of connecting duct 2 AB
114, it is necessary to reduce the connecting duct itself with bellows, etc.
It is economical because it eliminates the need for wide-diameter bellows.

(4) On the other hand, the bushing 6 is connected (h-ru connection) 2
(BC is a connection duct) 2 Compared to AB, however, the overall stability is improved and the connection with the gas fjJ line 7 is as easy as in the conventional case.

The present invention can be applied to the configuration of punctures (1 puncture, 2 punctures, 4 punctures, etc.), the arrangement of cooler LVRs, etc. [1, 1, 1, 2, etc.]. Also, the high voltage gate connection duct does not have to be between the parallel windings, but between the contralateral legs or even between the leads from outside! Needless to say, the same applies to the 21st match.

〔Effect of the invention〕

As explained above, according to the present invention, the distance between unit transformers is N? The installation of the connecting duct makes the work easy and economical, and it is possible to obtain a split type transformer which can minimize the design cost of the entire transformer group.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG. 2 is a hemostatic diagram of the same. No, IB, IC...Unit transformer, 2 AB, 2BC
Su...High pressure gate connection duct, 3...LVR, 4...
·low pressure. Neutral point contact #)'1-Duct, 5... Soundproof wall, 6...
Bushing, 7... Gas bus bar, 8B, 8C... Tank top cover, 9A, 9B... Tank (It! 1st page.

Claims (1)

[Claims] In a split type transformer in which the high voltage windings of three unit transformers are connected by high voltage leads through connection ducts provided in each unit transformer, and one end of which is connected to the gas bus bar, two
A split type transformer characterized in that a connection duct for connecting a unit transformer and a gas bus line is provided on the side of the tank, and another connection duct is provided on the top cover of the tank.