JPS5821155Y2 - Conservator shield and support structure in oil-filled electrical equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bushing, a conservator, and a conservator shielding and support structure in oil-filled electrical equipment equipped with a pressure relief device. By providing this support function, it is possible to simplify the structure and reduce the outer diameter of oil-filled electrical equipment.

The most important issue in oil-filled electrical equipment such as transformers that includes bushings, conservators, and pressure relief pipes is how to prevent corona discharge.

In particular, in high-voltage or ultra-high-voltage transformers such as test transformers, corona discharge is likely to occur due to the high output voltage. It is necessary to provide a large insulation distance.

For this purpose, conventionally, as shown in Fig. 1, the main body tank 3
The conservator 12 was installed outside the bushing 11 at a predetermined height (at the same level as the head of the bushing 11) to ensure an insulation distance 11 from the air shield 11a of the bushing 11 to the conservator 12. However, oil-filled electrical equipment with such a configuration has the following drawbacks.

(1) Since the conservator support stand 1 and the conservator support rod 2 are required, the structure and processing become complicated, and
The material cost is also high (instead of installing the conservator 12 on the outside of the main tank 3 using the conservator support stand 1 and the conservator support rod 2, the insulation distance 11 can be increased by increasing the inclination angle of the bushing 11). However, with this method, the moment due to the weight of the head of the bushing 11 will be applied to the bottom of the bushing, creating a weak point in strength, reducing earthquake resistance, or causing problems with the installation distance with other equipment. ).

(2) In order to reliably prevent corona discharge, it is necessary to make the insulation distance l□ considerably large depending on the generated voltage, and if the insulation distance 11 is made large, the external dimension L1 of the oil-filled electrical equipment also becomes large.

(3) It is necessary to attach the electrostatic shield 4 to the conservator support rod 2.

The present invention solves the above-mentioned conventional drawbacks by shielding the conservator with a pressure relief pipe and supporting the conservator with the pressure relief pipe.

Next, an embodiment of the present invention will be described based on the drawings from FIG. 2 onwards.

11 is a high pressure side bushing, 12 is a conservator, 13.
13 is a pressure relief pipe.

The high-pressure side bushing 11 is attached to one side of the main body tank 3 by a bushing pocket 6 so as to pass through the electrostatic shield 5.

Further, the conservator 12 is formed into a cylindrical shape, and the circumferential corner portions at both ends where corona discharge is most likely to be induced are electrostatically shielded by pressure relief tubes 13.

The pressure relief pipes 13, 13 are pipes with a large curvature and a circular cross section, and the curved portions 13a, 13a at the upper ends cover the circumferential corners at both ends of the conservator 12 to electrostatically shield them. At the same time, the lower end is suspended close to the floor surface so as to be led to the oil collecting tank 7.

14.14 is the pressure relief pipe 1 for installing the conservator 12
Supports provided at 3 and 13, 15 and 15 are pressure relief pipes 13,
A support connecting the vicinity of the oil spout 13b at the lower end of 13 to the side surface of the main tank 3, 16.16 a safety valve for the pressure relief pipes 13, 13, 17 an insulating oil, 18 a connecting pipe, and 19 an oil level gauge. ,
20 is the base.

In the embodiment shown in FIGS. 2 to 4, two pressure relief pipes 13 and 1 are used.
3 shows the case where the conservator 12 is shielded and supported, but as shown in FIGS. 5 and 6, the pressure relief pipe 13
Make the support pipe 21 with the same pipe as the support pipe 2.
1 and one pressure relief pipe 13 may be used to shield and support the conservator 12.

As explained above, the bushing 11 and the conservator 1
2, a conservator shield and support structure characterized in that in an oil-filled electrical device equipped with a pressure relief pipe 13, the conservator 12 is electrostatically shielded by the pressure relief pipe 13 and the conservator 12 is supported by the pressure relief pipe 13; Therefore, it has the following effects.

(1) The conservator support stand 1 as shown in Figure 1 is no longer necessary, and the structure and processing of oil-filled electrical equipment is simplified.
Also, the cost of materials will be reduced accordingly.

(2) Since the conservator 12 is electrostatically shielded by the pressure relief pipe 13, the insulation distance 11 can be shortened due to the shielding effect, and the external dimension L2 of the oil-filled electrical equipment can be reduced accordingly.

(3) The conservator support rod 2 and its electrostatic shield 4 as shown in FIG. 1 are not required.

[Brief explanation of drawings]

Fig. 1 is a side view of the conventional example, Fig. 2 is a side view of the embodiment of the present invention, Fig. 3 is a front view, Fig. 4 is a sectional view taken along the line IV-IV in Fig. 3, and Fig. 5 is another one. FIG. 6 is a side view of the embodiment, and FIG. 6 is a sectional view taken along the line VI-VI in FIG. 11... Bushing, 12... Conservator, 13... Pressure relief pipe.

Claims (1)

[Scope of utility model registration request] An oil-filled electrical device including a bushing 11, a conservator 12, and a pressure relief pipe 13, characterized in that the conservator 12 is electrostatically shielded by the pressure relief pipe 13, and the conservator 12 is supported by the pressure relief pipe 13. Conservator shielding and support structure.