JPS61214310A - Multi-shade suspension insulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hanging insulator used for insulating and supporting a power transmission line in an overhead power transmission line.

(Prior Art) A conventional suspension insulator for supporting a power transmission line in an overhead power transmission line is provided with a cap fitting (22) at the upper end of the insulator body (21) and cement (2) at the lower end, as shown in FIG.
3), a pin fitting (24) is attached, and a single shade (25) is provided protruding from the outer periphery of the insulator body (21), which has sufficient withstand voltage characteristics when supporting high voltage power transmission lines. To ensure this, an insulator chain consisting of many suspended insulators connected in series was used.

However, in the conventional suspension insulator shown in Fig. 5, approximately 1/2 of its total height is occupied by the cap fitting (22) which does not contribute to improving the withstand voltage characteristics, so when a large number of insulators are connected, The problem was that the total length of the insulator chain became significantly longer, and the tower had to be made larger due to the clearance with the tower, raising the cost of constructing the transmission line.

(Problem to be solved by the invention)
□The present invention has been completed with the aim of solving these conventional problems and providing a multi-hung suspended insulator that can obtain high withstand voltage characteristics without significantly increasing the overall length of the insulator chain.

(Means for Solving the Problems) The present invention provides two or more hats integrally protruding from the outer periphery of an insulator body having a cap metal fitting at the upper end and a pin metal fitting at the lower end. It is characterized in that the ratio of the surface leakage distance to the shade pinch between the lowest shade is set in the range of 5≦L/P≦9.

(Example) Next, the present invention will be explained in detail with reference to the illustrated example.
In Figure 1, il+ is a porcelain insulator body, (2) is a cap metal fitting that is bonded to one end of the insulator body with cement (3), and (4) is a bottle metal fitting that is bonded to the lower end of the insulator body fl+ with cement (5). It is. The insulator body (1) is elongated as shown in the figure, and the bottle fitting (4) is deeply inserted into its interior. There are two caps (6
), (7) are integrally provided to project from the insulator body (1). The number of hats can be any suitable number such as 2, 3, 4, etc., and a small hat (8) may be provided in the middle as shown in Figure 3. , (7) and (8), the shade pinch between the top shade (6) and the bottom shade (7) is P, and the surface leakage distance of the insulator (the camp shown in Figures 1 to 3) is Between the lower end (A) of the metal fitting (2) and the lower end (B) of the insulator body (11), connect the insulator body +11 and the shade (6), (
When the shortest path #) measured along the surface of 7) and (8) is defined as L, the design is such that the ratio L/P is in the range of 5≦L/P≦9. The reason for setting the value of L/P to 5 to 9 here is that, as shown in the graph of the relationship between the value of L/P and the required leakage distance per contamination withstand voltage IKV in Figure 4, the value of L/P is set to 5 to 9.
It has been confirmed through experiments that the maximum withstand voltage characteristics can be obtained when is 5 to 9. If L/P is less than 5, the surface leakage distance (L) is insufficient compared to the cap pitch (P), resulting in poor voltage resistance characteristics, and if L/P exceeds 9, the cap pitch (P) is insufficient. As a result, arcs are likely to occur between the caps, and the withstand voltage characteristics are also deteriorated. In addition, the shape of the hat is the first
In addition to an ordinary hat with many pleats (9) protruding from the lower surface as shown in the figure, it may also be an aerodynamic type hat as shown in FIGS. 2 and 3.

(Function) In this structure, the tip of the bottle fitting (4) at the lower end of the insulator body (1) is connected to the cap fitting (4) of the lower insulator.
It is the same as a conventional suspension insulator to connect a large number of insulators in series to insulate and support a power transmission line by engaging with the insulator (2), but in the present invention, the proportion of the cap metal fitting (2) to the total height of the insulator is reduced. is small, and the insulating insulator body +11, which effectively contributes to insulation, accounts for a large proportion, and
Since the value of L/P is set in the range of 5 to 9, which is also preferable for the dielectric strength characteristic, the dielectric strength value for the entire length of the insulator chain can be improved by about 15 to 20% compared to the conventional one. In this case, the total length of the insulator chain required to obtain the same withstand voltage value can be reduced by 15 to 20%.

For example, in the Takasa suspension insulator of the present invention shown in Fig. 1, the height H) is 235 mm and the equal diameter ([1) is 254 mφ
, if the cap pinch (P) is 85 m, the surface leakage distance (L
) is 635W, L/P is 7.47, and the required leakage distance per pollution withstand voltage IKV is 2 as shown in Figure 4.
It becomes 30/KV. Therefore, this Takasa suspension insulator is 400
When used on KV transmission lines, the design pollution withstand voltage is 400
X 1/3 . On the other hand, the conventional standard suspension insulator shown in Figure 5 has a height H) of 146 fi, an equal diameter (D) of 254 fi, and a surface leakage distance (L) of 292 mm, under the same contamination conditions. The required leakage distance per pollution-to-voltage IKV is 21
tm/KV. Therefore, in the same way as above, 4
The number of insulators and the total length of the insulator chain required to support the 00KV power transmission line are 19, or 2774 cranes. As described above, according to the present invention, the total length of the insulator chain required to obtain the same withstanding voltage characteristics as that of a standard type suspended insulator can be reduced to 85%, which is a reduction of about 15%. . In addition, the weight of the insulator chain in this case is 9 compared to the conventional one.
9 kg, and the weight of the present invention is 88 kg, which means that the weight can be reduced by about 11%.

(Effects of the Invention) As is clear from the above description, the present invention is capable of obtaining high withstand voltage characteristics without increasing the overall length of the insulator chain, and also provides insulating support for high voltage transmission tvA. In this case, there is no need to unnecessarily increase the size of the steel tower, and the cost of constructing power transmission lines can be reduced, so it has great practical value as it eliminates the problems of the conventional method.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention;
Fig. 2 is a partially cutaway front view showing the second embodiment, Fig. 3 is a partially cutaway front view showing the third embodiment, and Fig. 4 shows the value of L/P and the contamination withstand voltage per IKV. A graph showing the relationship with the required leakage distance, and FIG. 5 is a partially cutaway front view showing a conventional example. (1): Insulator body, (2): Cap fittings, (4): Pin fittings, (6), (7), (8): Cap. / Stone I ÷ 4 ≧ Iomi J, 7. /:g Figure 2, figure 3, figure 4, taxi, yen Name: Takasa Suspended Insulator 3, Relationship with the person making the amendment Patent applicant address: 2-56-4 Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Prefecture Address of agent: 4-2-12 Meieki, Nakamura-ku, Nagoya-shi, Aichi Prefecture No. 6 of the detailed description of the invention and the drawings in the specification in the Fuji Building specification.
Contents of the amendment (1), page 4 of the specification, lines 1 to 10, “L/
The value of P...deteriorates. ” part with the following text. [Here, the value of L/P is set to 5 to 9 because of the L/P value in Fig. 4.
Graph of the relationship between the value of P and the required leakage distance per contamination withstand voltage IKV and the value of L/P and contamination withstand voltage IKV in Figure 5
As shown in the graph of the relationship with the height of the insulator,
This is because it has been confirmed through experiments that the maximum withstand voltage characteristics can be obtained with the minimum insulator height when L/P is 5 to 9. When L/P is less than 5, the required leakage distance per contamination withstand voltage IKV is not much different from that when L/P is in the range of 5 to 9, as shown in Figure 4, but on the other hand, the required leakage distance per contamination withstand voltage IKV is The required insulator height increases significantly, as shown in FIG. 5, and therefore the pitch becomes longer for an equivalent surface leakage distance. As a result, the length of each insulator becomes long (so when considering a chain of insulators, the connection length becomes long and becomes uneconomical. Also, if the surface leakage distance of the insulator is increased to -m, the contamination withstand voltage per insulator increases. However, even if you increase only the surface leakage distance, if L/P exceeds 9, the cap pitch (P) will be relatively insufficient and arcs will easily occur between the caps. , Therefore, the contamination withstand voltage efficiency deteriorates, and the required surface leakage distance per contamination withstand voltage IKV increases as shown in Figure 4.'' (2), r400X1/3X1 on page 5, line 16 of the specification.
．． 1" means r400X1/TaiX1. Correct with IJ. (3) Add the following words between lines 9 and 10 on page 7 of the specification. Figure 6 is a graph showing the relationship between the value of rL/P and the required insulator height per contamination withstand voltage IKV (4). Figures 4 and 5 submitted with the application have been deleted and attached as an attachment. Figure 4 of
Add Figures 5 and 6. Above is the 4th diagram an + s + distance * 7q h'-z + (L,
1. ) Figure S, distance bet on surface 4/spoon, 7chi (noisy) Figure 6

Claims (1)

[Claims] Cap fitting (2) at the top end and pin fitting (4) at the bottom end
Two or more shades (6) on the outer periphery of the insulator body (1) equipped with
(7) and (8) are integrally protruded, and the shade pitch (P) between the top shade (6) and the bottom shade (7) is
The ratio (L/P) of the surface leakage distance (L) to 5≦L/
A Takasa suspension insulator characterized in that P≦9.