JPS58125808A - Connecting method for oil-immersed electrical machinery and apparatus - Google Patents

Abstract

PURPOSE:To improve workability, and to maintain high quality by setting up a detachable slide type connector to a connecting section on its midway of a lead wire while movably constituting at least one side of a multiple barrier. CONSTITUTION:Each unit transformer 1A, 1B is juxtaposed at the site first, and connecting ducts 7 incorporating multiple barrier insulated conductors are inserted and set up from the side and connected to each transformer connecting flange 11 juxtaposed. Multiple barrier insulators 12a in each unit transformer are moved in the axial direction until the insulators 12a and the end surfaces of leads 12b in the connecting ducts 7 are fast stuck and the leads are connected completely at that time. Shielding conductors 15, etc. are moved, and the multiple insulated barriers 6a are overlapped to 6b. Accordingly, the oil-immersed electrical machinery and apparatus juxtaposed can easily be detached even when it must be separated at the connecting duct sections, thus improving workability and maintaining the electrical machinery and apparatus in high quality.

Description

[Detailed Description of the Invention] [From @0 Technical Field] The present invention relates to a method for connecting oil-filled electrical equipment), particularly a connection between oil-filled electrical equipment that facilitates separation and reassembly of oil-filled electrical equipment. Regarding the method.

[Technical background of the invention and its problems]

For example, transformers used for power transmission of 500 kV class or higher have a single-phase capacity of 1500/3 MVA to 2000/3 MVA.
3W, so due to transportation constraints two to three single-phase units are required.
It becomes a divided structure. In such split transformers, in order to eliminate as much work as possible during on-site assembly, a method is often adopted in which the transformer contents are transported in an assembled state and connected in parallel via oil ducts at the site.

FIG. 1 shows a conceptual diagram of the connection part of such a transformer, and two unit transformers 111 installed in parallel are:
Both are stored in a tank 2, and are made up of a nine-iron core 3 and a $1 coil 4 wound around it. For 500 kV or more, the high voltage lead is often drawn from the center of the coil star. Therefore, the high voltage lead 5 of the split transformer installed in parallel is passed through the center of the tank wall. connected in parallel. In this case, the high voltage lead 5 has thick insulation on the lead surface and further insulation on the outside to cope with the high electric field stress on the lead surface due to the recent trend toward high voltage, reduction in tank size, and contact. Parlia 6 is applied in multiple layers to improve the dielectric strength of oil.
A multi-purrier method is used to subdivide the oil gap.

A, who transports such a transformer to the site and reassembles it.
Conventionally, the high voltage lead b was separated from the connection part M, or the lead 5 was separated from the coil part to prevent the series lead part from protruding between the tank or oil duct connections, and each was transported separately. , this detached lead 6 at the site.
I was connecting the parts.

However, the above-mentioned conventional method of reassembling and connecting multiple high-voltage lead devices on site not only complicates the work, but also causes crystalline O/4 instability or long-term damage due to disassembly and reassembly. There was a problem that the dielectric strength deteriorated due to dampness. In the case of a high voltage split transformer,
As part of the on-site assembly procedure, it is necessary to connect each accessory, lead 5, and duct 7 after on-site installation of each unit transformer, but with the conventional method described above, the work cannot be done without moving the transformer. [Objective of the Invention] The present invention solves the problems of the above-mentioned prior art, and provides a connection for oil-immersed electric machines that can be disassembled and reassembled in a short time, has good workability, and can maintain high quality. The purpose is to provide a method.

[Summary of the invention]

In order to achieve the ζO purpose, the present invention provides reed embroidery with a removable slide type connector at an intermediate connection part, while
At least one side of the connecting part of the multiple purrier is configured to be movable, and it is stored inside the equipment during transportation, and during on-site assembly, the series lead wrap is connected to the connector, and the movable multiple purrier is pulled out and connected. It is characterized in that the oil-filled electrical equipment is connected to each other by overlapping the other side at one side.

[Implementation example]

Hereinafter, a case will be described in which the present invention 11 is applied to a method for mutually combating two O-split transformers with reference to the embodiment shown in the drawings.

2nd IiIl shows a configuration diagram of the transformer interconnection part, where (,) is a sectional view before connection, and 佽) is a sectional view after connection.

In the figure, the same reference numerals as in FIG. 1 indicate the same or lower portions, and since the outer side of the coil 4 is generally a high-voltage coil, it is covered with multiple purriers 8. The outlet 9 from the high voltage coil is
Shift from the tank long side plate surface lO and the original image of the iron core 3, and connect the tank connection 7 with the large diameter insulated hollow conductor 12&
Derive it as

A removable connector 13m is provided at the tank connection 7 connector 11 end of the conductor 12m, and the connector 13m and the coil outlet 9 are connected by, for example, a steel stranded wire conductor 14 having an acceptable Va*O. The outside of the conductor 12&O is insulated with multiple purriers 6 to withstand high electric field stress. In addition, a shield conductor 15 is provided for the purpose of rounding and supporting the lead to avoid concentration of electric field in the 7 run no. Make it. At the same time, divided pressure @
Although the 1m is omitted in the figure, it has the same structure as the 1m.

On the other hand, the oil metal door provided between the unit transformers 1 and 1B is constructed of, for example, an extensible bellows, and a connection lead 12b is provided at the center, similar to the conductor 12m of the transformer 1 and IB described above. Its outer periphery is concentrically fixed to the winding duct 7 with multiple insulating purriers 6b via duct pieces. Good, there are connectors 13 on both ends of the connection lead P12bO.
11 will be provided.

The connecting part of the transformer 1III, III, and duct 7 is configured as described above, and during transportation, the transformer repellent, IB is #! As shown in Figure 2 (&), multiple insulation
The Hatanaka connector 13& is moved back in the direction of the lead axis so that it does not protrude from the 7-run 11 side, and the lid is covered before transportation. Similarly, the duct 7 is also transported separately with its both ends covered with a blind plexus.

On the other hand, at the site, each unit transformer I11m.

111 were first installed in parallel, and then the connection duct 7 with multi-layer insulated conductors was inserted from the side and installed in parallel, resulting in 9 transformers of 11 m each! ! Connected to 7F/Zo11.

In this case, as shown in Figure 2), in each unit transformer internal multiplex/rear insulated conductor 12 & inside the connecting duct 7, conductor 1zat in the axial direction KII#JI until the lead 12b and O end face are in close contact. Complete lead connections. after that,
The shield conductor 15, the lead support using the multiplex purrier 8, etc. are moved to make the multiplex insulating purrier 6a 5bIIC oversized. In this case, it is necessary to set the insulating purrier 6a of the transformer internal lead and the insulating purrier 6 in the connection duct to have different t for each layer by at least the thickness of the insulating arm.According to the above method, During transportation, by simply moving the required lug of the transformer's internal insulation barrier lead assembly by several tens of minutes, the structure is created so that it does not protrude from the tank connection 7 langes. It becomes like this. Also, the connector 13a + IBbO @ combined length is also as above.
(-The connector 13a should be about the same as the rear lug, but since it is generally a high-voltage lead, the current flowing through it is small, and the connector is housed within the large-diameter insulated hollow conductor 121° 12b.)

13, he can take a fairly large cross section.

Therefore, sufficient contact area for the applied current can be obtained without increasing the length. Therefore, during on-site assembly, the conductor 12 a
+12 bO Moving in the axial direction, the gap between the coil side end face of 412a and the coil 4 has a small movement dimension, so for example, the coil outlet 9 is 45
If the position is 1/2°, then the conductor 12aO movement and movement
' Since the hollow conductor 12m has a large diameter, the coil outlet 9 is connected to the tank 2 and the iron core 3.
There is no problem with dielectric strength as it is sufficiently shielded against

On the other hand, the movement of the conductor 12m is restricted by the coil lead-out lead 9, but the conductor 12m is restricted due to the small amount of current flowing through the lead.
Reduction or 1#! By adopting the conductor lead 14 and increasing the diameter of the conductor 12m, it is possible to secure the necessary movement dimension.

On the other hand, the connection duct 7 with a built-in multi-insulated Δ-rear lead is constructed by arranging each unit transformer in parallel, and then contracting the bellows of the duct slightly before moving the transformer internal lead.
There is no need for any other reassembly just by inserting it between the 27 and 11 and connecting it with the 7 lange. Here, the connector 13m
, 13bO junction or the method of adhesion Qg of the ends with the conductors 12&, 12b may be a problem, but for example, the connection duct 7
Before stretching the contracted bellows, you can use a transparent mg etc. from the first section using X-tightening.

In the above embodiment, explanation was given by taking as an example a case in which a split pressure unit and a connecting duct installed in parallel are combined. However, similar to the above embodiment, Bushitang Poku, Tonai and! There is no need to reinstall the tongue, and connections can be easily made by simply moving the internal leads of the transformer.

In addition, although not shown in the drawings, it is possible to directly connect multiple transformers to each other without going through an oil duct, or to support separately routed line end gear. By employing the connection method according to the present invention even in a 4-port terminal that is connected to a terminal and has a built-in lead insulated at the rear and a transformer main body, the same effects as in the above embodiment can be obtained. Of course, this can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, not only during on-site installation and assembly but also after the operation of oil-filled electrical equipment, even if it becomes necessary to cut off the oil-filled electric vibrators installed in parallel at the connecting duct part for some reason. By simply moving the internal leads of each oil-filled electrical device, it is possible to easily vent the oil-filled electrical device without moving the entire device, making it particularly easy to clean the tip of the can. Also, multiple
- Rear high-voltage leads do not require complicated assembly work during on-site installation, and there is less risk of quality flakiness due to reassembly or long-term exposure of the contents, which reduces the risk of lowering the purchase price due to humidity, and saves time and space. By making the connection, a method for connecting oil-filled electrical equipment can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of the connection part of a split type transformer for explaining the conventional connection method, and Fig. 2 is a diagram of the connection part of the split type transformer for explaining the connection method according to the present invention. )
is a cross-sectional view before joining, and 弽) is a cross-sectional view after joining. 1 person, IB...unit transformer, 2...tank, 3...
・Iron core, 4... Coil, 5... High voltage lead, 61
6 & +6b...Multiple insulation purrier, 7...Duct, 8...Multiple purrier, 9...Coil outlet, 1
0... Tank long side - plate surface, ll... Connection 7'': Tank, 12a... Insulated hollow conductor, 12b... Connection lead, 13m, 13b... Connector, 14... Copper Stranded conductor, 15... rolled conductor. Figure 1

Claims (2)

[Claims] (1) In a method in which oil-filled electrical equipment is connected to each other by connecting lead wires insulated by multiple purriers each connected to the oil-filled electrical equipment, each of the lead wires has a removable slide attached to the connecting portion. Each of the multiple purriers is configured such that at least one of the multiple purriers is movable along the axial direction of the lead wire, and the multiple purriers are connected by overlapping with the other multiple purrier at the connecting portion. How to connect oil-filled electrical equipment. (2) In claim 112g1, it is stated that nine or more oil-filled electric devices installed in parallel are insulated from each other by multiple purriers and connected in parallel by an oil duct containing a 7t IJ-wire. Oil-filled electrical equipment O! l Determination method 3) Range of % fraud request m1. In the fj description, oil-filled electrical equipment itself! A method for connecting oil-filled electrical equipment, characterized in that lead wires insulated between V-rings and V-rings are connected to a built-in pocket.