CN203339043U - Withstand voltage structure for earthing switch - Google Patents

Abstract

The utility model discloses a withstand voltage structure for an earthing switch. The withstand voltage structure is formed by a U-shaped mounting base and two parallel voltage-sharing rods. The two voltage-sharing rods are disposed on two sides of the U-shaped mounting base. Two ends of both the voltage-sharing rods are in a hemispheric shape, and a middle part of the voltage-sharing rod is cylindrical. Since two ends of the two voltage-sharing rods are in the hemispheric shape and middle part is cylindrical, electric fields near sphere ends are relatively uniform, air is not easy to ionize, thereby further improving a withstand voltage value between a movable contact and a static contact of the earthing switch.

Description

A kind of earthed switch pressure-resistance structure

Technical field

The utility model relates to a kind of earthed switch pressure-resistance structure, refers in particular to a kind of pressure-equalizing device.

Background technology

During the normal power transmission of high-tension switch cabinet, be arranged at earthed switch wherein in gate-dividing state, when high-tension switch cabinet need to overhaul, earthed switch must be in "on" position.

As shown in Figures 1 and 2, in prior art, the earthed switch of high-tension switch cabinet generally includes a fixed contact 10 and a moving contact 20, and fixed contact 10 is arranged on terminals 30, and terminals 30 are arranged on insulator 40, and insulator 40 is arranged on pedestal 50; Moving contact 20 and rotating shaft 60 interlocks, rotating shaft 60 is arranged on pedestal 50.Rotating shaft 60 is rotated and is driven moving contact 20 swings, makes moving contact 20 and fixed contact 10 in separating brake or "on" position.

Due to moving contact 20 and fixed contact 10 radius of curvature all less, as shown in Figure 3, electric field is comparatively concentrated, air easily ionizes and discharges.According to relevant criterion, the lightning impulse withstand voltage required between the dynamic/static contact of existing 10kV high-voltage switch cabinet grounding switch is 75KV.Yet, in high altitude localities, because air is thinner, electric field is easily breakdown, require that lightning impulse between the dynamic/static contact of high-voltage switch cabinet grounding switch is withstand voltage may reach 95 KV.

Conventional solution can increase the height of insulator 40 by increasing the distance between moving contact 20 and fixed contact 10, thereby increase clear distance, improves the lightning impulse withstand voltage.Yet, the length that the change of insulator 40 height need to be adjusted moving contact 20 adapts to, this will cause the variation of whole earthed switch structure, its mechanical performance (comprising the mechanical properties such as on/off switch speed) and electric property (as the short circuit making capability) need to again be verified, thereby brought a series of new problems.

Summary of the invention

The purpose of this utility model is to provide a kind of earthed switch pressure-resistance structure that improves withstand voltage.

For reaching above-mentioned purpose, solution of the present utility model is:

A kind of earthed switch ground cutter pressure-resistance structure, be comprised of " U " type mount pad and two parallel equal pressure bars; Two equal pressure bars are separately positioned on " U " type mount pad both sides; The two ends of two equal pressure bars are hemisphere, and centre is cylindrical.

Further, two equal pressure bar one ends arrange respectively locating slot, and the both ends of " U " type mount pad arrange respectively the welding breach; Insert respectively in locating slot at the two ends of " U " type mount pad, and two equal pressure bars are fixed on " U " type mount pad by the welding breach.

Further, two vertical installing holes are set on " U " type mount pad.

After adopting such scheme, the utility model is arranged on terminals, and two equal pressure bars are positioned at the fixed contact both sides.Because the two ends of two equal pressure bars are hemisphere, centre is cylindrical, and therefore, near electric field pommel is comparatively even, is not easy air ionization, and then improves the withstand voltage between the earthed switch dynamic/static contact, and its lightning impulse is withstand voltage reaches 95 KV.

The accompanying drawing explanation

Fig. 1 is prior art earthed switch perspective view;

Fig. 2 is prior art earthed switch end view;

Fig. 3 is prior art earthed switch discharge principle figure;

Fig. 4 is the utility model perspective view;

Fig. 5 is another angle perspective view of the utility model;

Fig. 6 is the utility model exploded view;

Fig. 7 is that the utility model is installed on the earthed switch three-dimensional structure diagram;

Fig. 8 is that the utility model is installed on another angle three-dimensional structure diagram of earthed switch;

Fig. 9 is that the utility model is installed on the earthed switch end view;

Figure 10 installs earthed switch discharge principle figure of the present utility model.

Label declaration

Fixed contact 10 moving contacts 20

Terminals 30 insulators 40

Pedestal 50 rotating shafts 60

U-shaped mount pad 1 welding breach 11

The equal pressure bar 2 of installing hole 12

Locating slot 21 terminals 3

Fixed contact 4 insulators 5

Pedestal 6 moving contacts 7

Rotating shaft 8.

Embodiment

Below in conjunction with drawings and the specific embodiments, the utility model is described in detail.

Consult shown in Fig. 4 to Fig. 6, the utility model discloses a kind of pressure-resistance structure 100 for earthed switch, be comprised of " U " type mount pad 1 and two parallel equal pressure bars 2.

Two equal pressure bars 2 are separately positioned on " U " type mount pad 1 both sides, and in the present embodiment, " U " type mount pad 1 is positioned at an end of two equal pressure bars 2, so facilitates installation of the present utility model; The two ends of two equal pressure bars 2 are hemisphere, and centre is cylindrical.

In the present embodiment, two equal pressure bar 2 one ends arrange respectively locating slot 21, and as shown in Figure 6, and the both ends of " U " type mount pad 1 arrange respectively welding breach 11; Insert respectively in locating slot 21 at the two ends of " U " type mount pad 1, and by welding breach 11, " U " type mount pad 1 is fixed between two equal pressure bars 2.Certainly, two equal pressure bars 2 and " U " type mount pad 1 can be one-body molded.

Simultaneously, the utility model arranges two vertical installing holes 12 on " U " type mount pad 1, by described two vertical installing holes 12, makes the utility model be easily installed in the earthed switch terminals.

As shown in Figure 7 to 9, the utility model is arranged on earthed switch terminals 3, make fixed contact 4 between two equal pressure bars 2, and terminals 3 is arranged on insulated terminal 5, and insulator 5 is arranged on pedestal 6; Moving contact 7 and rotating shaft 8 interlocks, rotating shaft 8 is arranged on pedestal 6.Because the two ends of two equal pressure bars 2 are hemisphere, centre is cylindrical, therefore, as shown in figure 10, near electric field pommel is comparatively even, air is easily ionizable not, and then improving the withstand voltage between the earthed switch dynamic/static contact, its lightning impulse withstand voltage can reach 95 KV, and without the design that changes former earthed switch, thereby guarantee the standardization that earthed switch is produced, can improve the lightning impulse withstand voltage level of switch cubicle by increasing by an equal pressure bar.

The foregoing is only an embodiment of the present utility model, not to the restriction of this case design, all equivalent variations of doing according to the design key of this case, all fall into the protection range of this case.

Claims (3)

1. an earthed switch pressure-resistance structure, is characterized in that: " U " type mount pad and two parallel equal pressure bars, consist of; Two equal pressure bars are separately positioned on " U " type mount pad both sides; The two ends of two equal pressure bars are hemisphere, and centre is cylindrical.

2. a kind of earthed switch pressure-resistance structure as claimed in claim 1, it is characterized in that: two equal pressure bar one ends arrange respectively locating slot, and the both ends of " U " type mount pad arrange respectively the welding breach; Insert respectively in locating slot at the two ends of " U " type mount pad, and two equal pressure bars are fixed on " U " type mount pad by the welding breach.

3. a kind of earthed switch pressure-resistance structure as claimed in claim 1, is characterized in that: two vertical installing holes are set on " U " type mount pad.

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