JPS5927510A - Split type single phase transformer - Google Patents

Abstract

PURPOSE:To minimize the length of neutral point lead wire without magnetically giving bad influence on the occasion of providing a voltage regulator for loaded condition in the side of the unit transformer which is located in the opposite side to the unit transformer providing the primary through bushing and the secondary through bushing. CONSTITUTION:The primary through bushing 16 and the secondary through bushing 17 are provided at the external side of the unit transformer 1B located at the one side, while a voltage regulator 2 for loaded condition in the side of the unit transformer 1A located in the opposite side to said unit transformer 1B. In addition to the primary lead 14A and secondary lead 15A of the unit transformer 1A respectively connected to the through bushings, the neutral point lead wire 23B of the unit transformer 1B passes the iron core window of the iron core 3B. A total sum of current vectors of each lead becomes zero, a plurality of unit transformers 1A, 1B can be connected in parallel allowing the lead wire to pass in the iron core window of the other unit transformer 1B without giving magnetically bad influence as described above and moreover the neutral point lead 23A of the unit transformer 1A can be connected in the minimum distance to the winding 27 of the voltage regulator 2 for loaded condition.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a split-type transformer, particularly a split-type single-phase transformer in which a plurality of unit transformers arranged in parallel are connected in parallel to form a single-phase transformer. Concerning vessels.

[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 power transmission voltage in order to transmit power efficiently. Currently, power transmission with a nominal voltage of 1000 KV is planned, and various developments are underway toward commercial operation. Transformers are one example of this, but since they are approximately twice as large in voltage and capacity as conventional 500K V-class transformers, they require dramatic advances.

In addition, due to various reasons, the location conditions of the substation where the transformer will be installed are likely to be worse than the current 500 KV power transmission substation, which will result 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. Therefore, the idea of a so-called split-type single-phase transformer, in which the single-phase transformer is further divided into multiple unit transformers, has been developed.

Figure 1 is a wiring diagram of a single-phase transformer using a conventional split-type transformer.1) A single-phase transformer consists of two unit transformers IA and IB, and each unit transformer LA and IB have a common A load voltage regulator 2 is included. Each unit transformer LA, IB has direct IK (high voltage) winding 11A, IIB shunt (medium voltage) winding 12A, 12
B and tertiary winding! 3A, 13B, each unit transformer 1*, 1m series winding 11A, IIB and shunt winding 12A, 12B are primary side (high voltage) leads 14A, 14B.
and are connected in parallel by secondary side (medium pressure) leads 15A and 15B, respectively, and guided to the negative side through bushing 15 and the secondary side tributary bushing 17.

Further, the on-load voltage regulator 2 includes the tertiary winding 13A.

Excitation winding 18 connected in parallel to 13B, said shunt winding 1
2A and 12B have a tap winding 19 connected in series via neutral point leads 23A and 23B, and a tap changer 20 for switching the tap of the tap winding 19, and a tertiary winding connected in parallel of each unit transformer. The wires 13A, 13B and the excitation winding 18 are led to tertiary through bushings 21B, 21b, respectively, and the tap changer 20 is led to the neutral point air bushing 2.
They are each guided by 2.

In single-phase transformers connected in this way, parallel connection of each unit transformer is performed by passing the lead of one unit transformer through the iron core window inner metal of the other unit transformer, as previously proposed.・The split single-phase transformer will be explained using FIG. 2. In the figure, two unit transformers IA and IB are arranged in parallel so that their longitudinal sides face each other. Each unit transformer IA, IB has a tank 29A, 29
B, this tank 29A.

Iron cores 3A, 3n arranged in 29B and this iron core 3A.

It is composed of windings 24A and 24B consisting of the aforementioned series winding, shunt winding, and tertiary winding, which are wound around the main leg 3B.

Here, the primary lead 14A and secondary lead 15A1 of one unit transformer are connected to the other unit transformer through the primary lead duct 25 and secondary lead duct 26 attached to the side of the tank 29A. The lead ducts pass through the core window inner metal of the core 3B of this unit transformer IB and pass through the inner metal of the core window of the unit transformer IB (each lead duct). are connected to each. The primary side lead 14B and the secondary side lead 15B of the unit transformer IB on the side through which the metal lead in the iron core window passes are also connected to the primary side through bushing 16, respectively.
and the secondary side through bushing 17, and two unit transformers IA and IB are connected in parallel. The neutral point lead 23A of one unit transformer passes through the secondary side lead duct 26 and the iron core window of the unit transformer IB, and together with the neutral point lead 2313 of the unit transformer IB, one common winding of the on-load voltage regulator 2 It is connected to 27.

With this configuration, when the negative side lead 14A separates the adjacent unit transformer IB, it is possible to provide a long dedicated lead duct (1) and pass it through it, or increase the size of the tank and connect it to the top or back of the iron core. In order to pass through the iron core window metal of the unit transformer IB and the vicinity of the winding 24B, which is at the same potential as the primary lead 14A, the tank 3c
There is no need to make the iron core 3B particularly large.

By the way, normally, when a lead simply passes through the core window, the current passing through the lead may generate a magnetic force, which may disturb the magnetic flux distribution within the core and cause unexpected loss. In the case of the above configuration, there is no need to worry about this. This is because when the metal lead in the core window of the unit transformer IB penetrates, the primary lead 14A of one single-turn unit transformer IA is penetrated by the next lead 14A and the neutral point lead 23A at the same time. This is because the vectorial sum of the currents flowing through these leads is always 0, and the magnetic flux distribution of the iron core 3B is not disturbed.

However, for this reason, it is necessary to always pull out the next lead 15A and the neutral point lead 23A in the same direction to the next lead 14A, the second through bushing 16, the second through bushing 17, and the on-load voltage regulator 2. must be installed on the same side of the unit transformer. Therefore, when the on-load voltage regulator 2 is installed on the side opposite to the side where the secondary side through bushing 16 and the secondary side through bushing 17 are provided, it is necessary to route the neutral point lead 23A for a very long time. Yes, it is economically disadvantageous.

[Purpose of the invention]

The present invention has been made in consideration of the above-mentioned points, and it is possible to transform a plurality of unit transformers by passing the primary lead and secondary lead of at least one unit transformer through the iron core window inner metal of another unit transformer. A split-type partial phase transformer in which transformers are connected in parallel, and in particular, the on-load voltage regulator is connected to a unit transformer located on the opposite side to a unit transformer provided with a secondary side through bushing and a secondary side through bushing. When installed on the side, it is possible to minimize the length of the neutral point lead connected to the load voltage regulator without causing an adverse effect on the magnetic field or force. The purpose is to provide transformers.

[Summary of the invention]

In order to achieve this object, the present invention provides a primary side node, a secondary side lead, and a neutral point lead of at least one unit transformer in which a secondary side through bushing and a secondary side through bushing are not provided. , - The secondary side lead and the secondary side lead are at least on the primary side]'':r, through the core window inner metal of the unit transformer provided with the through bushing and the secondary side through bushing, and the primary side through bushing and the secondary side. The neutral point lead is connected to the load voltage adjustment WS while the neutral point lead is connected to the through bushing, and the neutral point lead of the winding of the unit transformer e?r through which these leads pass is connected to the unit transformer. on either the side leg of iron I6 or -hi, the lower yoke leg,
iiii Primary side lead and secondary side I that passed through the large window
J-)' It is wound so as to cancel out the magnetomotive force generated by K, and is connected to voltage adjustment during load special charge.

[Embodiments of the invention]

An embodiment of the present invention will be explained below with reference to the drawings. In FIG. 3, two unit transformers IA and IB are arranged in parallel so that their pitcher force facing sides face each other. Each unit transformer IA, IB is a tank'l 9A T 2
9 B % 24 windings consisting of series winding, shunt winding and tertiary winding are arranged in these tanks 29A and 29B and wound around the main legs of the iron cores 3A and 3B and these iron cores 3A and 311. .

They are constructed of 24B strands and have the same rating.

A primary through-through bushing 16 and a secondary through-through bushing 17 are provided on the outer surface of the unit transformer IB located on one side, and on the opposite side from the secondary through-through bushing 16 and secondary through bushing 17. A load voltage regulator 2 is disposed on the side of one unit transformer.

Here, the primary side lead 1 of one unit transformer where a secondary side through bushing and a secondary side through bushing are not provided.
4A and the secondary side lead 15A are provided with a secondary side through bushing 16 and a secondary side through bushing 17 via a primary side lead duct 25 and a secondary side lead duct 26 attached to the side surface of the tank 29A. unit transformer IB
The lead ducts pass through the core window inner metal of the core 3B of this unit transformer IB and are connected to the primary through bushing 16 and secondary through bushing 17, respectively, which are attached to the tank side opposite to 25 and 26. It is connected.

``!Nine unit transformer IA neutral point lead 23A does not pass through the core window of unit transformer IB, unit transformer IA.

The winding 2 of the load special voltage regulator 2 is directly passed through the common neutral point lead duct 28 arranged on the side or top surface of the IB.
7 is connected.

The primary side lead 14B and secondary side lead 15B of one unit transformer IB are directly connected to the primary side through-through pushing 16 and the secondary side through-through bushing 17, but the neutral point lead 23B of this unit transformer IB After winding the side leg or the upper and lower yoke legs of the iron core 3C once, it is connected to the winding 27 of the load voltage regulator 2 through the neutral point lead duct 28. In addition to the primary lead 14A and secondary lead 15A of the unit transformer IA, the neutral point lead 23B of the unit transformer IB passes through the core window of the core 3B, so that each lead 14A, 15A, 23B The neutral point of the unit transformer IA is set to 0, and the vector current sum of
This is to prevent an adverse magnetic field effect due to the fact that A does not pass through the core window of the core 3B.

In other words, in the case of a single-turn unit transformer, the vectorial sum of the currents flowing through the negative lead, secondary lead, and neutral lead is always 0, so these three leads simultaneously Even if the iron core of the transformer passes through the inner metal of the window, the magnetic field will cause an adverse effect Q.
Q' k will not be given.

Also, when connecting a number of unit transformers in parallel, each unit transformer has the same rating, so the - next lead,
It is not necessary that the t m leads consisting of the secondary lead and the neutral point lead are leads drawn from the windings of the same transformer, but the primary leads drawn from separate unit transformers,
The same thing can be seen when selecting a combination of secondary side leads and neutral point leads. Therefore, as in the present invention, the unit transformer 1
Human primary (1tll lead 14A and secondary lead 15
A and the other unit transformer IB's neutral point leads 23B are made into a pair and are passed through the iron core window inner metal, so that the vectorial current sum of each lead becomes O.

Therefore, with this configuration, the 14 primary leads and the secondary lead LSA of one unit transformer IA can be passed through the iron core window metal of the other unit transformer IB without adversely affecting the magnetic field. It is possible to connect multiple unit transformers IA and IB in parallel, but it is also possible to install a long dedicated lead duct l-wo when the next-side lead 14A crosses the unit transformer IB, or to install a system with a larger tank etc. There's no need to. Moreover, since the neutral point 23A of the unit transformer IA can be connected to the winding m27 of the on-load voltage regulator 2 at the shortest distance, the on-load voltage regulator 2 can be connected to the primary through-through pusher 16 and the secondary through-through bushing. Even if the neutral point lead 23A is placed on the opposite side, the length of the neutral point lead 23A can be minimized.
It is Noh.

Regarding the configuration in which the neutral point lead 23B is wound around the core side leg, a sufficiently reliable configuration can be achieved using the prior art since the voltage of the neutral point lead 23B is relatively low.

FIG. 4 shows another embodiment of the present invention, in which three unit transformers I
This shows a configuration in which A, IB, and IC are connected in parallel. The configurations of the two unit transformers IA and III are the same as in the above embodiment, but the unit transformer IC has 14 primary side leads of the unit transformers LA and IB with the iron core window of the iron core 3C.

14B and the secondary side leads 15A and 15B pass through, so the neutral point lead 23c f: After winding the side legs or upper and lower yoke legs of the iron core 3c twice, winding 2 of the load voltage regulator 2
7 is connected. In addition, lc is a tank, 14ce is a primary side lead, 15(! is a secondary side lead, and 24c is a winding.

With this configuration, each unit transformer IA, IB, and Ic can be connected in parallel without adversely affecting the magnetic field.
Moreover, by increasing the size of the tank, etc., the neutral point is 23A,
There is no need to route 23B for a long time.

〔Effect of the invention〕

As explained above, according to the present invention, when several unit transformers υ are connected in parallel by arranging the negative side through-through bushing, the secondary side through-through bushing, and the on-load voltage regulator on the opposite side, , magnetic field bad shadow 4′? It is possible to provide a small participle type single-phase transformer that can minimize the length of the neutral point lead connected to the on-load voltage regulator without giving rise to any problems.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram showing the connection of a participial type single-phase transformer, Fig. 2 is a plan cross-sectional view showing a split type II-phase transformer that has been previously mapped out, and Fig. 3 is a participial type single-phase transformer according to the present invention. FIG. 4 is a plan sectional view showing one embodiment of a single-phase transformer, and FIG. 4 is a plan sectional view showing another embodiment of the present invention. IA, IB, IC...Unit transformer 2...Load voltage regulator 3A, 3B, 3C...Iron core 14A, 14B, 14C...-Next side lead 15A, 1
5B, 15C...Secondary side lead 16...-Next side through bushing L...Secondary side through bushing 23A, 23B, 23C...Neutral point lead 24A, 24B, 24C, 27 ...Winding 25...-
Next side lead duct 26...Secondary side lead duct path...Neutral point-do duct (7, 1t7) Agent Patent attorney Noriyuki Chika
(1 other person) Figure 1 // + 2 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] N unit transformers (n is an integer of 2 or more) with the same rating, each with a winding wound around the main leg of the iron core and housed in a tank, are arranged side by side, and the first unit transformer located on one side is connected to the primary transformer. A side through-through bushing is provided, and a secondary side through-hole bushing is provided, and a load voltage regulator is installed on the side of the n-th unit transformer located on the opposite side of the through-hole bushing, and each A9 transformer is connected in parallel. - Among the primary lead, secondary lead and neutral lead of at least one unit transformer in which a secondary through bushing and a secondary through bushing are not provided, -
The next side lead and the secondary side lead are connected to the second side through bushing and the second side through bushing by passing through the core window ta of at least the first unit transformer, and the unit transformer through which these leads pass through. The neutral point lead of the winding,
Either the side legs or the upper and lower yoke legs of the core of this unit transformer are wound so as to cancel the magnetomotive force generated by the primary and secondary leads passing through the core window, so that the voltage at the time of load is A split single-phase transformer characterized in that it is connected to a regulator.