CN107946005A - A kind of wind resistance composite insulator applied to strong wind area - Google Patents

Abstract

The purpose of the invention is to solve the problem of the breakage of the insulator in the high-voltage transmission line under the extreme environment. The technical solution adopted to realize the object of the present invention is as follows, a wind-resistant composite insulator applied in a strong wind area is characterized in that it includes an insulator body. The insulator body has three types of sheds, namely: shed I with a diameter of D1, shed II with a diameter of D2 and shed III with a diameter of D3, wherein D1>D2>D3. The shed I has two through holes I running through its upper and lower surfaces. The two through holes I are symmetrical about the central axis of the shed I. The umbrella skirt II has two through holes II passing through its upper and lower surfaces. The two through holes II are symmetrical about the central axis of the shed II.

Description

A Wind-Resistant Composite Insulator Applied in Strong Wind Area

technical field

The invention relates to the field of electrical equipment, in particular to an improved insulator.

Background technique

Composite insulators are widely used in UHV transmission lines in Northwest my country, but the 750kV transmission line passing through the "Thirty Miles Wind District" has been in operation for less than a year. A large number of insulator sheds were broken at the root. Under the condition of strong wind, the umbrella skirt has a continuous and stable strong swing, which eventually leads to the fatigue fracture of the silicone rubber material.

At present, some papers have studied the wind resistance characteristics of 750kV insulators in strong wind areas, but no further research has been done on the improvement of its wind resistance performance.

Contents of the invention

The purpose of the invention is to solve the problem of the breakage of the insulator in the high-voltage transmission line under the extreme environment.

The technical solution adopted to realize the object of the present invention is as follows, a wind-resistant composite insulator used in a strong wind area is characterized in that it includes an insulator body. The insulator body has three types of sheds, namely: shed I with a diameter of D1, shed II with a diameter of D2 and shed III with a diameter of D3, wherein D1>D2>D3. The shed I has two through holes I running through its upper and lower surfaces. The two through holes I are symmetrical about the central axis of the shed I. The umbrella skirt II has two through holes II passing through its upper and lower surfaces. The two through holes II are symmetrical about the central axis of the shed II.

Further, the insulator body has several sheds, including at least two sheds I. Wherein, both ends of the insulator body are sheds I. There are two sheds III between two adjacent sheds I, and one shed II between these two sheds II.

Further, the insulator body has nine sheds in total, which are shed I, shed III, shed II, shed III, shed I, shed III, shed II, shed III and shed I.

Further, the distance between two adjacent sheds is equal.

Further, the diameters of the through hole I and the through hole II are equal.

The technical effect of the present invention is unquestionable. Based on the above scheme, the section of the insulator will bear less pressure difference and air flow disturbance, which is more conducive to maintaining its own rigidity and shape. Thus ensuring the reliability of the insulator in the strong wind area. Its reliability is recorded in the experiments in the examples and proved.

Description of drawings

Fig. 1 is the structural representation of the insulator involved in the present invention;

Fig. 2 is the A-A direction view of Fig. 1;

Fig. 3 is the B-B direction sectional view of Fig. 1;

Fig. 4 is the C-C direction sectional view of Fig. 2;

Figure 5 shows the vorticity distribution of the existing insulator flow field

Fig. 6 is the vorticity distribution of the insulator flow field of the present invention

Figure 7 shows the streamlines of the existing insulator flow field

Fig. 8 is the insulator flow field streamline of the present invention

Figure 9 shows the pressure distribution of the existing insulator flow field

Fig. 10 is the flow field pressure distribution of the insulator of the present invention.

In the figure: umbrella skirt I (1), umbrella skirt II (2), umbrella skirt III (3), insulator body (4), through hole I (101), through hole II (102).

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

A wind-resistant composite insulator used in a strong wind area includes an insulator body 4 . The insulator body 4 has three types of sheds, namely: shed I with a diameter of D1, shed II with a diameter of D2 and shed III with a diameter of D3, wherein, since D1>D2>D3, that is They are called large, medium and small umbrella skirts respectively. In the embodiment, as shown in FIG. 1 , the insulator body 4 has nine sheds in total, which are shed I, shed III, shed II, shed III, shed I, shed III, and shed II , Shed III and I, wherein D1=210mm, D2=175mm, D3=130mm. The distance between two adjacent (nearest) sheds I is 120mm.

The shed I has two through holes I running through its upper and lower surfaces. The two through holes I are symmetrical about the central axis of the shed I. The umbrella skirt II has two through holes II passing through its upper and lower surfaces. The two through holes II are symmetrical about the central axis of the shed II. In an embodiment, the diameters of the through hole I and the through hole II are equal, both being 6mm.

Referring to Fig. 5 (current insulator flow field streamline) and Fig. 6 (insulator flow field streamline in this embodiment), both insulators are in a strong wind environment with a wind speed of 40m/s, and the angle between the insulator and the horizontal plane is 50°. It can be clearly seen that after the treatment of the insulator in this embodiment, a part of the airflow on the windward side will flow through the holes, which reduces the severity of flow separation at the edge of the fan. On the other hand, the weakening of flow separation at the edge of each canopy makes the air flow no longer gather in a large amount on the leeward side of the top canopy.

Referring to Figure 7 (the vorticity distribution of the existing insulator flow field) and Figure 8 (the vorticity distribution of the insulator flow field in this embodiment), the two insulators are both in a strong wind environment with a wind speed of 40m/s, and the angle between the insulator and the horizontal plane is 50° °, it can be clearly seen that most of the vortices between the canopy surfaces of the insulator in this embodiment are eliminated, and the vorticity is obviously lower than that of the existing insulator section. In addition, the two separated vortices near the back side of the umbrella surface at the top of the existing insulator section are forced to move away from the umbrella surface after the treatment of this embodiment, and the vorticity decreases significantly.

Referring to Fig. 9 (pressure distribution of the flow field of the existing insulator) and Fig. 10 (pressure distribution of the flow field of the insulator in this embodiment), both insulators are in a strong wind environment with a wind speed of 40m/s, and the angle between the insulator and the horizontal plane is 50°. It can be clearly seen that the pressure difference between the upper and lower sides of the insulator and the leeward side of the insulator in this embodiment is significantly reduced, which has a certain inhibitory effect on possible wind-induced vibrations.

On the whole, the section of the insulator in this embodiment will bear less pressure difference and air flow disturbance, which is more conducive to maintaining its own rigidity and shape.

Claims (5)

1. A kind of 1. wind resistance composite insulator applied to strong wind area, it is characterised in that：Including an insulator body (4)；It is described exhausted Edge body (4) has the full skirt of three types, is respectively：The full skirt I (1) of a diameter of D1, the full skirt II (2) of a diameter of D2 and The full skirt III (3) of a diameter of D3, wherein, D1 ＞ D2 ＞ D3；There are two through the logical of its upper and lower surface on the full skirt I (1) Hole I (101)；The two through holes I (101) is substantially symmetrical about its central axis on full skirt I's (1)；There are two on the full skirt II (2) to run through The through hole II (102) of its upper and lower surface；The two through holes II (102) is substantially symmetrical about its central axis on full skirt II's (2).
2. A kind of 2. wind resistance composite insulator applied to strong wind area according to claim 1, it is characterised in that：The insulation Sub- body (4) shares several full skirts, including at least two full skirt I (1)；Wherein, the both ends of insulator body (4) are full skirt I(1)；There are two full skirt III (3) between two adjacent full skirt I (1), there is a full skirt between the two full skirts II (2) II(2)。
3. A kind of 3. wind resistance composite insulator applied to strong wind area according to claim 2, it is characterised in that：The insulation Sub- body (4) shares nine full skirts, is full skirt I (1), full skirt III (3), full skirt II (2), full skirt III (3), full skirt I successively (1), full skirt III (3), full skirt II (2), full skirt III (3) and full skirt I (1).
4. A kind of 4. wind resistance composite insulator applied to strong wind area according to claim 1, it is characterised in that：Adjacent two The distance between a full skirt is equal.
5. A kind of 5. wind resistance composite insulator applied to strong wind area according to claim 4, it is characterised in that：The through hole The diameter of I (101) and through hole II (102) are equal.