JPS59117433A - Stator winding unit for direct cooling rotary electric machine - Google Patents

Abstract

PURPOSE:To equivalently thermally elongate of shrink all conductors by providing a coolant link master tube in the vicinity of a crossover track, connecting the coolant exhaust side end of the crossover track to the link master tube and providing a coolant bypass for coupling both between the link master tube and the coolant exhaust master tube. CONSTITUTION:Coolant is supplied from a coolant supply master tube 3 to a conductor 2 having a crossover track 6 and a conductor 1 having no crossover track. In case of the conductor 2, the coolant is supplied via an insulated hose 10 to the coupler of the conductor 2 to the crossover track 6. The other end of the crossover track 6 is coupled through an insulated hose 12 to a coolant link master tube 11 provided adjacent to the tube 3. The tube 11 is coupled to a coolant exhaust master tube 4 through a coolant bypass 13. In this manner, the coolant is supplied similarly directly from the tube 3 to the conductors 2 and 1.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an improvement in a stator winding device for a directly cooled rotating electrical machine, and in particular, to an improvement in a stator winding device for a directly cooled rotating electrical machine, and in particular, to improve a stator winding device for a directly cooled rotating electrical machine. The present invention relates to an improvement of a stator winding device of this kind, in which the wires are also designed to be directly cooled by a cooling medium.

[Prior art]

In general, in large-capacity rotating electric machines, especially in large-capacity turbine generators, a large current of over 10,000 amperes flows through the stator windings, so the amount of heat generated is large and indirect cooling is required due to the conductor insulation of the windings. Cooling has reached its limit. Recently, this conductor is formed into a hollow conductor, and a cooling medium such as water or oil is allowed to flow through the hollow portion to directly cool the conductor. Supplying cooling medium to and discharging cooling medium from a large number of parallel hollow conductors requires a large number of piping, which complicates the design process, so generally a cooling medium supply main pipe is installed near the end of the conductor. Normally, a coolant discharge main pipe is provided, and the coolant 1 and body are supplied and discharged through these main pipes.

On the other hand, among these conductors, nine wires are provided across the ends of the conductor connected to the output terminal. Therefore, in order to cool this crossover wire as well, in a conductor having this crossover wire, a cooling medium is directly supplied from the cooling medium supply main pipe, as shown in, for example, Japanese Patent Application Laid-open No. 53-49206. Instead, a cooling medium that cools the wire is supplied by flowing through the hollow part of the wire. That is, this relationship will be explained in more detail using the drawings.

Figure 1 shows a part of the winding device.The figure shows hollow conductors 1 and 2 housed in the winding grooves (not shown) in the stator core. The cooling medium supply main pipe 3 and the cooling medium discharge main pipe 4 are arranged in the vicinity of the cooling medium supply pipe 3 and the cooling medium discharge main pipe 4, respectively. In this case, in particular, the conductor 2 connected to the outlet terminal 5 is directly connected to the cooling medium supply main pipe 3.
In order to cool the crossing wire 6 as well as cooling the crossing wire 6, it is coupled via the crossing wire 6. With such a configuration, the cooling medium flows as shown by the arrows in the figure. That is, one flow flows from the coolant supply main pipe 3 through the insulating hose 7 into the conductor 1, absorbs the heat of the conductor there, and eventually passes through the insulated hose 8 to reach the coolant discharge main pipe 4. The other flow enters the cross wire 6 from the cooling medium supply main pipe 3 via the insulating hose 9, cools the cross wire, and then enters the conductor 2. After the conductor 2 is cooled, it passes through the same insulated hose 8 as the conductor 1 and reaches the cooling medium discharge main pipe 4. is listed as one representative, but in reality there are many.

Due to the flow of the cooling medium described above, the conductors 1 and 2 and the cross wire 6
However, with this configuration, the degree of cooling is different between the conductor 2 connected to the crossover wire 6 and the conductor 1 without the crossover wire. A certain conductor 2 is not cooled by the cooling medium that is warm enough to cool the crossing wire 6, and a temperature difference occurs between the conductors 1 and 2. Normally, there are at least nine parts of the Wataru line in a three-phase AC turbine generator, so
The temperature of these nine conductors will be higher than that of the other conductors. Therefore, in this configuration, a difference in thermal expansion occurs between the conductors, and thermal stress is concentrated on the conductor with a high temperature rise, and unreasonable force is applied to the insulator covering the conductor, causing the insulator to deteriorate. I hate causing damage.

[Purpose of the invention]

The present invention has been conceived with this in mind, and its object is therefore to provide a winding device of this kind, that is, a conductor coupled with a wire across the wire and a conductor not coupled with a wire across the wire. Even in a winding device in which the wire is directly cooled, all conductors expand and contract in the same way,
It is an object of the present invention to provide a winding device of this type that sufficiently relieves stress caused by differences in thermal expansion and contraction.

[Summary of the invention]

That is, the present invention provides a coolant relay main pipe near the cross line, connects the coolant discharge side end of the cross line to this main pipe, and connects the coolant relay main pipe and the coolant discharge main pipe. A cooling medium bypass is provided between the tube and the tube to cool the conductor of the winding and the wire in parallel, thereby achieving the desired purpose.

[Embodiments of the invention]

The present invention will be described in detail below based on the illustrated embodiments.

FIG. 2 shows a part of the winding device.

Components that are the same as those in FIG. 1 are designated by the same reference numerals and explanations will be omitted. In this case, the cooling medium is supplied from the cooling medium supply main pipe 3 to both the conductor 2 having the crossing line 6 and the conductor 1 not having the crossing line, but especially in the case of the conductor 2 having the crossing line, The supply is provided by an insulated hose 10 to the junction of the wire 6 and the conductor 2. The other end of the cross-wire 6 is connected via an insulating hose 12 to a coolant relay main pipe 11 provided adjacent to the coolant supply main pipe 3 . Moreover, this cooling medium relay main pipe 11 is connected to the cooling medium side path 1.
3 to a coolant discharge main pipe 4 .

In the winding device formed as shown in FIG. 1, a cooling medium flows as shown by the arrows in the figure, and the conductors 1 and 2 and the wire 6 are cooled. That is, in one flow, the coolant is supplied to the conductor 1 from the coolant supply main pipe 3 via the insulated hose 7, and is discharged to the coolant discharge main pipe 4 via the insulated hose 8, as in the conventional case. . The other flow flows from the cooling medium supply main tube 3 through the insulated hose 10 into the joint between the conductor 2 and the wire 6, and the cooling medium that has flowed into the conductor 2 side flows through the insulated hose 8. The coolant that flows into the coolant discharge main pipe 4 and on the other hand flows into the P line 6 side takes a route leading to the coolant discharge main pipe 4 via the coolant relay main pipe 11 and the coolant side passage 13. It is.

With such a configuration, the conductor 2 having a crossing wire and the conductor 1 having no crossing wire are similarly supplied with cooling medium directly from the cooling medium supply main pipe 3, and have a discharge route. are the same, so the side conductors 1 and 2 are cooled in the same way and undergo similar thermal expansion and contraction, so that the stress that occurs between them as in the prior art can be sufficiently alleviated.

〔Effect of the invention〕

As explained above, according to the winding device of the present invention,
A coolant relay main pipe is provided near the cross line, and the coolant discharge side end of the cross line is connected to this relay main pipe. A cooling medium bypass is provided to connect the winding conductor and the crossing wire, so that the conductor of the winding and the crossing wire are cooled in parallel. Because they are cooled independently, they are cooled under the same conditions as conductors without cross-wires, and therefore all conductors, regardless of the presence or absence of cross-wires, undergo thermal expansion and contraction in the same way, which previously tended to occur. Stress caused by thermal expansion and contraction can be sufficiently alleviated.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing main parts of a stator winding device for a conventional directly cooled rotating electrical machine, and FIG. 2 is a perspective view showing main parts of a stator winding device for a directly cooled rotating electrical machine according to the present invention. . 1.2...Conductor, 3...Cooling medium supply main pipe, 4...
・Cooling medium discharge main pipe, 5... Output terminal, 6... Cross line, 7-10.12... Insulated hose, 11... Cooling medium relay 14

Claims (1)

[Claims] 1. A large number of hollow conductors housed in the winding grooves of the stator core and formed so that a cooling medium flows therein;
A hollow crossover wire is formed to lead a part of these conductors to the output terminal and allow a cooling medium to flow therein, and a hollow crossover wire is arranged near the end of the conductor and the conductor. and a cooling medium supply main pipe that supplies a cooling medium to the conductor, and a cooling medium discharge main pipe that collects and discharges the cooling medium discharged from the conductor, and includes a cooling medium supply main pipe that supplies a cooling medium to the conductor, and a cooling medium discharge main pipe that collects and discharges the cooling medium discharged from the conductor. In a stator winding device for a directly cooled rotating electric machine, the stator winding device of a directly cooled rotating electric machine is provided with a coolant relay main tube near the crossover wire, and the coolant discharge of the crossover wire is provided in the coolant relay bus tube. In addition to connecting the side ends, a cooling medium bypass is provided between this cooling medium relay main pipe and the cooling medium discharge main pipe to connect both, so that the conductor and Wataru Di are cooled in parallel. This is a stator winding device for direct cooling rotating electric machines.