JPS5961016A - Lead apparatus of split type transformer - Google Patents

Abstract

PURPOSE:To simplify the lead connecting work by previously locating an insulating lead having insulating barrier between the coils of the one unit transformer and by inserting the insulating lead into the lead duct by sliding it during the lead connecting work. CONSTITUTION:A lead composed of an insulating lead 7 having rigidity and insulating barriers 8 which are arranged concentrically with an adequate intervals around the insulating lead are disaposed between coils 3 in the transformer tank 1 and it is secured by a metal 12 of the cover of the man-holes 10, 11 provided at the end surface of longer side of transformer tank 1. The unit transformers A, B are installed in parallel and the lead provided to the transformer B is inserted into the lead duct 4 by sliding it and thereby both ends of insulating lead 7 are connected to the coil 3 and bushing pocket 6.

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention d, in particular, is a split-type three-phase transformer that can be used for ultra-high voltage power transmission systems, in which a single-phase transformer is further converted into a unit transformer of a single-stage unit. This invention relates to a lead device for dividing the parts into parts and connecting them in parallel.

<Technical background of the invention> With the recent increase in electricity demand, 500 KV power transmission has been realized [7], and plans for 100 OT (V class ultra-ultra high voltage power transmission (hereinafter referred to as UI (hereinafter referred to as V)) are also being advanced. There is.

The transformers installed in this 500I (V or UHV transmission substation) are single-phase unit transformers that are constructed by installing multiple unit transformers in parallel to avoid increasing the size. In addition, three transformers are combined to form a three-phase bank configuration and are used as separate type transformers.This allows for an increase in transformer capacity by dealing with dimensional restrictions during transportation. It is necessary to perform lead connection work between the unit transformers of the split type transformer in the substation, and the simplification of fRj has become an important issue.

<Problems with Background Art> During on-site installation of the above-mentioned split hydraulic pressure device, a worker manually connects the leads between the unit hydraulic pressure devices. However, it is impossible to provide a sufficient working environment on site, such as air conditioning near the unit transformers, so the contents of the transformers, which have been brought to good condition at the factory, are exposed to the earth's atmosphere. There was a high risk of deterioration of the insulation condition due to contact, moisture absorption, and dust intrusion. Therefore, it is necessary to make such lead connections on-site in as short a time as possible, and it is desired to simplify the work.

'However, since the leads to be connected must be outside the area where the iL voltage is very high, a sufficiently reliable insulation structure is required. However, the conventional method of connecting leads using a duct, in which the connected leads are passed through a long lead duct with a grounding hole, requires more work time and increases insulation weaknesses. In particular, it is desirable that the high-voltage leads can be simply connected to an insulatively stable location.

<Object of the Invention> The present invention has been made in view of the above points, and provides a method for simplifying the lead connection work between unit transformers of a split type transformer that is used in the field, and providing an insulatively reliable tube. It is an object of the present invention to provide a lead device for a split type transformer that allows easy export of lead connections.

<Mechanism of the Invention> In order to achieve the above object, the present invention provides a method in which, when unit transformers are connected in parallel, an insulating lead with an insulating barrier of an IJ-duct between two unit transformers is partially configured in advance. Store the coil of one of the unit transformers, slide it, and insert it inside the lead duct. The insulating lead built into the transformer is equipped with a device to support the insulated lead during transportation of the transformer to a manhole cover attached to the end face of the long side of the transformer tank. It is something to do.

<Embodiment of the Invention> An embodiment of the present invention will be described below with reference to the drawings. 11th:;<I is a diagram showing the lead parallel connection between the llj position transformers in the minute-jll phase transformer according to the present invention. The 11th switch 1 connects the quake compressor link 11i to the four-legged iron core 2 and the coil 3 wound around the two central legs, MrJt,
A unit transformer A containing the contents of the transformed transformer and a unit transformer B with the same groove are lined up side by side with the longitudinal direction of the tank 1 in the same direction! Please take a look. Unit transformation W
The high voltage lead 513 of B is connected to the unit transformer via the whip edge lead described later, passes between the two coils 3 of unit transformer A through the lead duct 4 installed between B, and is connected to the bushing pocket 6. This is where the work to do is done. 1st
In the diagram, the positive lead is 5A.

5BJ-J, the outer lead of Vapi Castle is omitted. Here, between the coils 3 of one unit transformer B, the insulated lead 7 is connected in advance to both ends so that the rigidity is fj' L. 1. With intervals. A lead composed of a special barrier 8 is arranged. Next V (slide this insulated lead 7 to the outside indicated by the dotted line in Figure 1.?14
2G1 indicates the subsequent work steps).

The slid insulating lead 7 is inserted into the lead duct 4 [
In order to determine this, an insulating barrier 9 is inserted between the insulating lead 7 and the lead tactile member 4. still,
Both ends of the insulating lead 7 are magnetically connected to connect the coil 3 and the bushing pocket 6, respectively. In order to connect the insulated lead 7 with the insulated puller by sliding it in this way, it is necessary to place the 6-fold lead 7 on the transformer coil 3 before transporting the transformer to the site. There is. FIG. 3 shows the voltage transformation of the insulated lead 7 between the coils 3 according to the present invention. A diagram showing the fixing method during non-transportation is provided.

A suitably sized manopole or hahanodhole 10, 11 is placed on the end face of the long side of the 31st Aij transformer tank 1, and a box edge door is attached to the inside of the manhole or handball 10 and moon cover. Due to the supporting metal fittings 12, the distance between carp and 3? 7C is a diagram showing how the insulated lead 7 is fixed.

<Effects of the Invention> In the J split type summer pressure up to 4 lead device constructed as described above, the following effects (C2) can be obtained.

(J) It is absolutely necessary to place the leads between the coils when transporting the transformer. It is desirable to avoid fixing the supports 11 and 7I on a part of the inside of the hood transformer. If Kotorishi (=J),
I had a hard time working on the inside of the transformer 1^J and after connecting the leads 1? (ii) Since it can be simply removed, it can be highly reliable (a-).

(2) It's time to remove the manhole - C-1. The liquid flange for the lead duct can be used as a substitute for the manhole, and the amount of water in the tank can be minimized.

(3) The manhole attached to the tank not only supports part of the M2 edge, but also supports when sliding the insulated lead.
Slide operation is possible from the manhole, which not only saves time for connection work, but also makes it easy to check the status of connection work.

In explaining the present invention, Oka used a unit transformer with a coil structure with three legs in parallel.
It goes without saying that the L-position transformer also has the same functions and effects as those between the sections.

[Brief explanation of drawings]

1 and 2 are plan views showing a lead device for a split type transformer according to the present invention, and FIG. 3 is a plan view showing a method for supporting an insulated lead according to the present invention. 1 Tank 2... Single-phase 4-leg iron core 3... Coil 4... Lead duct 5A, 5B... High voltage lead 6... Bushing pocket 7... Insulated lead 8.9... Barrier 10.11 ... Manhole with lead support device (731
7) Representative Patent Attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In the lead duct between two unit transformers in the lead device of a split transformer that configures a single-phase transformer by connecting multiple unit transformers in parallel via leads? Provide an insulated lead with an edge barrier, place this insulated lead between the coils of one unit transformer before the lead connection work, and slide the N MfJ insulated lead during the lead connection work. - When inserting this slideable insulating barrier into a duct and arranging it between the coils of one unit transformer, attach a manhole flange to the long side end face of the unit transformer tank, and attach the insulating barrier to this seat. A reed device for a split cell pressure device, characterized in that it uses a manpole lid as a receptacle device for supporting the reed.