JPS5961108A - Single-phase transformer - Google Patents

Abstract

PURPOSE:To reduce length of a gas insulation bus at high voltage side and improve insulation reliability, by a method wherein a lead duct at high voltage side installed to a tank of a unit transformer is disposed near the gas insulation bus in the horizontal direction in comparison with a lead duct at intermediate voltage side. CONSTITUTION:In unit transformers 1, 2, tanks 4, 4 have longitudinal side portions 4a, 4a opposed to each other and a connecting duct 7 at high voltage side is connected between the side portions 4a, 4a, and a lead duct 8 at intermediate voltage side is connected between top portions 4c, 4c of the tanks 4, 4. In one unit transformer 1, a lead duct 9 at high voltage side and a lead duct 10 at intermediate voltage side are projected sideways from a longitudinal side portion 4b of the tank 4 being not opposed to other unit transformer 2. The lead duct 9 at high voltage side is disposed near a gas insulation bus 15 at high voltage side, and the lead duct 10 at intermediate voltage side is disposed remote from the gas insulation bus 15 in the horizontal direction in comparison with the lead duct 9 and in upper position than the lead duct 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an m-phase transformer comprising a plurality of unit transformers arranged in parallel.

[Technical background of the invention and its problems] 500 kV class which has been implemented in recent years or whose implementation is being considered1
In ultra-super high voltage power transmission in the 000kV class, a single-phase transformer consisting of multiple unit transformers arranged side by side is used as a transformer installed at a substation etc. due to transportation restrictions and to increase the transformer capacity. The units are combined to form a three-phase bank configuration. In order to connect the single-phase transformers of each phase in this split-type three-phase transformer to the switchgear, a gas-insulated bus bar is used to improve insulation.

Thus, a unit transformer has an iron core, and a high voltage wire, a medium voltage winding, and a low voltage winding wound around the iron core, inside the tank. In order to connect the winding leads to the gas-insulated bus in a single-phase transformer, for example, each unit transformer is connected via a connecting duct, and each unit transformer's high, medium,
The leads of each low-voltage winding are passed through the connection duct and tank, collected in the tank of one unit transformer, drawn out to the lead duct provided on the tongue surface, and connected to the external gas insulated bus bar through this lead duct. I have to.

However, when connecting the winding IJ-do of the unit transformer to the gas-insulated bus in this way, the voltage on the high-voltage side is the highest among the high-voltage, medium-voltage, and low-voltage winding leads, so the high-voltage side winding Insulation reliability when connecting wire leads to gas-insulated busbars is most important compared to other parts.

[Purpose of the invention]

An object of the present invention is to provide a single-phase transformer with improved insulation reliability on the high-voltage side, which poses the most insulation problems when connecting the winding leads of a unit transformer to a gas-insulated bus bar. .

[Ia essentials of the invention]

In the single-phase transformer of the present invention, the high-voltage side lead duct provided in the tank of the unit transformer is arranged horizontally closer to the gas-insulated bus bar side with respect to the intermediate-voltage side lead duct, so that the high-voltage side Insulation 1: Reduces the length of the u wire.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to drawings.

An embodiment of the single-phase transformer of the present invention will be described with reference to FIGS. 1 and 2. FIG. In the figure, 1 and 2 are 2 that constitute a single-phase transformer.
These unit transformers are arranged in parallel and surrounded by a soundproof wall 3. Each unit transformer 1, 2 is provided with an iron core 5 inside a tank 4, and three sets of windings 61.6B, 6C'5: wound around the legs of this iron core 5.
6C is constructed by concentrically winding a high-voltage winding, a medium-voltage winding, and a low-voltage winding. Mutually opposing longitudinal side surfaces 4 of each tank 4, 4 in unit variable BE H7t 2
A connection duct 7 on the high pressure side is connected between a and 4a, and a lead duct 8 on the medium pressure side is connected between the upper surfaces 4c and 4c of each tank 4. A high-voltage side lead duct 9 and an intermediate-voltage side lead duct 1o are provided to protrude laterally on the longitudinal side surface portion 4b of the tank 4 of one unit transformer 1 on the side not facing the unit transformer 2. The high-pressure side lead duct 9 has a high-pressure side gas insulated bus bar 15 as described later.
The intermediate voltage side lead duct 10 is placed at a position 1j further away from the gas insulated bus bar 15 than the lead duct 9 in the horizontal direction and above the lead duct 9. There is.

The windings (46A to 6C) in each unit transformer 1 and 2 are
The high voltage windings of each are connected in parallel.

The winding lead 11 of the high voltage winding in the unit transformer 1 receives a high voltage [F, 01! The winding lead IIB of high voltage 8 wires in the unit transformer 2 enters the tank 4 of the unit transformer 1 through the connecting duct 7 from the tank 4, and the winding lead IIB of the unit transformer 1 enters the tank 4 of the unit transformer 1, for example, the winding 6A. , 6B and is drawn out to the lead duct 9. The medium voltage windings of the windings 6 A y 6 C in each m-order transformer 1°2 are connected in parallel. The winding lead 12 of the medium voltage winding in the unit transformer 1 is drawn out from the tank 4 to the lead duct 10 on the medium voltage side, and the winding lead 12B of the medium voltage winding in the unit transformer 2 is connected from the tank 4. F:s
3 inches and enters the tank 4 of the unit transformer 1, for example, passes between the windings y+16 B and e c and enters the lead duct 1.
It is pulled out to 0.

Furthermore, bushing ducts 13 and 14 are installed in the high-voltage side and medium-voltage side lead ducts 9 and 10 provided in the tank 4 of the unit transformer 1, respectively.
3 and 14, there is a high-pressure side gas insulated bus bar 15 arranged horizontally.
The intermediate voltage side gas insulated bus bar 16 is connected to the intermediate voltage side gas insulated bus bar 16. The high pressure side and medium pressure side gas insulated busbars 15.16 are connected to the lead duct 9.
The former is placed on the lower horizontal plane and the latter is placed on the upper horizontal plane according to the height position of the pushing duct) I 3.14
From the connection position to the side of one end of the tank 4 (right side in Figure 1,
(left side in Figure 2), and is further bent at a right angle at the same point to form the high voltage side switchgear field (not shown).
and the low voltage side switchgear field (not shown) with the same number, and are connected to the switchgear installed in each installation field. The switchgear installation fields are provided on both sides of the transformer, and the gas-insulated busbars 15, 16 extend in the same straight line and in opposite directions when viewed from above, as shown in FIG. Here, looking at the positional relationship between the lead duct 9.1o and the gas insulated bus bar I5 on the high voltage side, the high voltage side lead duct 9 is horizontally connected to the connection end portion zsb of the gas insulated bus bar 15 with respect to the low voltage side lead duct IQ. It is installed in a close position.

That is, the lead duct 9 (χ position) and the gas insulated bus bar 1
The distance lh between the lead duct 10 (y position) and the connecting end portion 15b is the distance lh between the lead duct 10 (y position) and the connecting end portion 15b.
is smaller by distance d compared to . Therefore, the gas insulated bus 15
It is smaller than the length of the same part of the push-cut edge m16 in . - Therefore, the number of insulating spacers provided on the gas insulated bus bar 15 is reduced, and the number of weak points in the insulation is reduced, so that insulation stability and reliability are increased, and the weight is reduced, so that the number of supporting members can be reduced. Furthermore, since the high-pressure side lead duct 9 and the medium-pressure side lead duct 1θ are provided at different heights in the tank 4, each lead can be easily drawn out.

In the figure, 17 is a low-voltage side lead duct that is installed on the upper surface of the tank 4 of each unit transformer 1, 2 and houses a lead for connecting the low-voltage winding of each unit transformer 1, 2, and 18 is a load duct. Special electric UE is a regulator. In the figure, reference numeral 19 denotes an intermediate voltage lightning arrester connected to the intermediate voltage side lead duct 10 and provided in a space below it. Note that the lid duct on the low pressure side is omitted in FIG.

FIGS. 3 to 6 respectively show i15. of the present invention. Another embodiment of the phase transformer is shown, and the same parts as in FIGS. 1 and 2 are given the same reference numerals, and the description thereof will be omitted.

315 and 4 respectively show side portions 4b of the tank 4 of the unit transformer 1 that do not face the tank 4 of the unit transformer 2.
A high pressure side lead duct 9 is provided in the upper surface part 4c of the tank 4.
A medium pressure side lead duct 10 is provided on the side.

FIG. 5 shows that a high-voltage side lead duct 9 and an intermediate-voltage side lead duct 10 are connected and provided between mutually opposing side surfaces 4a, 4a of tanks 4.4 in each unit transformer 1, 2, and each unit transformer is The winding leads of the high-voltage windings and medium-voltage windings in the devices 1 and 2 are drawn out to a lead duct 9.10.

FIG. 6 shows a high voltage side lead duct 9 between opposing side surfaces 4a and 4th of tanks 4 and 4 in each unit transformer 1 and 2.
The intermediate pressure side lead duct 10 is connected to the upper surface portion 4cp4c of the tanks 4, 4.

Furthermore, in the embodiment shown in FIGS. 1 and 2,
Since the high-voltage side lead duct 9 is provided closer to the gas-insulated bus bar than the intermediate-voltage side lead duct 1θ, there is a space for arranging the intermediate-voltage M lightning device 19 below the intermediate-voltage side lead duct 10. Surge arresters are generally gas-insulated, but in the case of the medium-voltage surge arrester 19, the voltage is sufficiently low compared to ultra-high-voltage power transmission, and based on past experience, insulation methods using oil-gas bushings and spacers can be used to insulate the medium-voltage side lead duct. 10 can be connected directly. Therefore, according to the above configuration, in addition to saving space for arranging the medium voltage lightning arrester 19,
It is easy to connect and is placed closest to the transformer, providing greater protection. This arrangement of medium-voltage arresters can also be applied to the embodiments shown in FIGS. 3, 5, and 6.

〔Effect of the invention〕

As explained above, the 1% phase transformer of the present invention can significantly shorten the length of the gas-insulated bus bar connected to the high-voltage side lead duct, and improve the insulation reliability of the high-voltage side part, which is a problem in terms of insulation. You can do it by increasing your

[Brief explanation of drawings]

1 and 2 are a plan view and a side view showing a schematic configuration of an embodiment of the single-phase transformer II of the present invention, and FIGS. 3 and 4 are
5 and 6 are plan views showing schematic configurations of other different embodiments. 1.2... Unit transformer, 4... Tank, 5... Iron core, 6... Winding wire, 7, 8... Connection lead, 9...
High pressure side lead duct, 10...9 side lead duct,
11 people. 11B... Winding lead of high voltage winding, 12 A, 1
2B... Winding lead of medium voltage winding, 13.14... Bushing duct, 15... High voltage side gas insulated bus bar, 16
...Intermediate pressure side gas insulated bus bar. Suzue Takeshi Syllable 1 Figure f42 Figure 15 +5a 13 9 Figure 5 Figure 6 Figure 37

Claims (1)

[Claims] Takasho winding and middle Ff wrapped around the iron core inside the tank, @
A plurality of m-position transformers each having a transformer line are arranged in parallel, and the winding leads of the high-voltage winding and medium-voltage winding of each unit transformer UF are connected from the tank to the high-voltage side lead duct and the medium-voltage side lead duct. The high voltage side lead duct provided in the unit transformation heat tank is arranged at a position closer to the gas insulated bus in the horizontal direction with respect to the intermediate voltage side lead duct. A single-phase transformer featuring: