CN108511138A - It is a kind of high to climb electric spacing charge adaptively dissipation high voltage direct current disc insulator - Google Patents

Abstract

A high-voltage DC basin-type insulator with high creepage distance charge self-adaptive dissipation, comprising an insulating area, an adaptive area, and a creepage area, the adaptive area is located at the lower end of the insulating area, and the creepage area is located at the insulating area A connecting flange is provided around the adaptive area, and a central block is provided in the middle of the insulating area. At the same time, a protrusion is added at the top to increase the distance along the surface. The beneficial effect is that it can be used as a pot insulator after being proportionally adjusted through the given shape design and applied to a DC GIL system. Moreover, it can be applied to AC and DC power equipment that needs pot insulators to support, including the fields of air pressure isolation and conductor support. At the same time, by adding protrusions at the top to increase the distance along the surface, the effect of self-adaptive dissipation of charges can be achieved.

Description

A High Creepage Distance Charge Adaptive Dissipation High Voltage DC Basin Insulator

technical field

The invention relates to the technical field of power transmission and distribution equipment, in particular to a high-voltage direct-current pot insulator for self-adaptive dissipation of high creepage distance charges.

Background technique

Gas-insulated metal-enclosed transmission line (GIL) has many characteristics such as large transmission capacity, low loss, high safety and environmental friendliness. It is an effective means for large-capacity and long-distance power transmission. In special environments such as dense transmission corridors, dangerous landforms, rivers, lakes and seas, gas-insulated metal-enclosed lines become the best choice for power transmission. At present, although gas-insulated metal-enclosed transmission lines have gradually been widely used in the world, however, they are mainly used in AC power grids, and the application of GIL in DC transmission systems is rarely reported. In recent years, many manufacturing units in the world, such as Japan's Mitsubishi, Toshiba, Germany's Siemens, and Switzerland's ABB, have successively carried out research and development work on DC GIL, but no formal commercial operation reports have been seen. The reason is that the basin insulators in the GIL equipment will accumulate charges on the surface of the pot insulators in the long-term working in the high-voltage DC environment, which will distort the original electric field, resulting in a significant decrease in the flashover voltage of the insulators. At present, with the rapid development of high-voltage direct current transmission projects in my country, the demand for direct current GIL equipment is becoming increasingly urgent, and the research on the surface charge accumulation characteristics and control measures of its internal insulating parts under high-voltage direct current has become a hot issue for electric power researchers in various countries. one.

In recent years, the research on surface charge accumulation of pot insulators in DC GIL mainly focuses on the measurement theory and precise measurement technology of surface charge of gas-solid insulating medium, surface charge accumulation and dissipation characteristics of DC insulators, surface charge control measures, etc. aspect. However, so far, most of the relevant research is still limited to the simulation analysis and the modification research of small samples and small blocks. The relevant research on new high-voltage DC GIL basin insulators with industrial application potential is still rarely reported.

In addition, the creepage distance at the top of the insulator of the existing design is too low, and the use effect is not good.

Contents of the invention

The object of the present invention is to solve the above-mentioned problems by designing a high-voltage direct-current pot insulator with high creepage distance and self-adaptive dissipation of charge. The specific design scheme is:

A high-creepage distance and high-creepage distance self-adaptive dissipation of high-voltage DC pot insulators, including an insulation area, an adaptive area, and a creepage area, the adaptive area is located at the lower end of the insulation area, and the creepage area Located at the top of the insulating area, a connecting flange is arranged around the adaptive area, and a central block is arranged in the middle of the insulating area.

Both the insulating area and the self-adaptive area are basin-shaped annular structures, and the creepage area is an annular structure. The insulating area, adaptive area, and creepage area are all formed by casting. The region forms an "Ω"-shaped structure as a whole, and the insulating region and the creepage region form a "U"-shaped structure as a whole.

The central insert includes an insert, the left and right ends of the insert are covered with fixing rings, the fixing ring is in interference connection with the insert, and the lower side of the fixing ring is provided with a fixing hook. The hook is connected with the fixing ring bolt, and the bolt used to connect the fixing hook and the fixing ring passes through the fixing hook, the lower wall of the fixing ring, the insert, and the upper wall of the fixing ring in sequence from bottom to top, and the fixing hook It is a horizontal hook structure.

The insulating area is formed by pouring epoxy resin-based alumina material, and a curing agent needs to be added and stirred before pouring the epoxy resin-based alumina material.

The self-adapting area is formed by pouring epoxy resin-based zinc oxide and silicon carbide mixed materials, and the silicon carbide is at least one of micron-sized particles and nano-sized particles.

The creepage zone is one of silicon carbide filler or silicon carbide zinc oxide mixture.

The middle part of the slug is a reserved bolt fixing hole, and the number of the reserved bolt fixing holes is multiple. The diameter depth and the number of inner diameters are multiple, and the insulating region fits with the depressions and protrusions.

The beneficial effects of the self-adaptive dissipation of the high-voltage DC pot insulator with high creepage distance and high creepage distance obtained through the above-mentioned technical solution of the present invention are as follows:

It can be used in DC GIL system as pot insulator after proportional adjustment through the given shape design. Moreover, it can be applied to AC and DC power equipment that needs pot insulators to support, including the fields of air pressure isolation and conductor support.

At the same time, by adding protrusions at the top to increase the distance along the surface, the effect of self-adaptive dissipation of charges can be achieved.

Description of drawings

Fig. 1 is a schematic structural view of the high creepage distance high creepage distance charge self-adaptive dissipation high voltage DC pot insulator of the present invention;

Fig. 2 is a schematic structural view of the central block of the present invention;

In the figure, 1. Insulation area; 2. Adaptive area; 3. Creepage area; 4. Flange ring; 5. Central insert; 51. Insert; 52. Fixed ring; Leave holes for bolt fixing.

Detailed ways

The present invention will be specifically described below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of the structure of the high-creepage distance high-creepage distance self-adaptive dissipation of the high-voltage DC basin insulator according to the present invention; Fig. 2 is a schematic diagram of the structure of the center insert according to the present invention, as shown in Fig. 1 and Fig. 2 , a high-creepage spacing high-creepage spacing charge self-adaptive dissipation high-voltage DC pot insulator, including an insulating area 1, an adaptive area 2, and a creepage area 3, and the adaptive area 2 is located at the lower end of the insulating area 1 , the creepage zone 3 is located at the top of the insulating zone 1 , a connecting flange 4 is arranged around the adaptive zone 2 , and a central insert 5 is arranged in the middle of the insulating zone 1 .

The insulating area 1 and the self-adaptive area 2 are basin-shaped annular structures, the creepage area 3 is an annular structure, and the insulating area 1, adaptive area 2, and creepage area 3 are all formed by casting, and the pouring The sequence is to pour the creepage region 3 first, and then pour the insulating region 1 and the adaptive region 2. The interval between different regions is 4 hours. The insulating region 1 and the adaptive region 2 form an "Ω"-shaped structure as a whole. The insulating region 1 and the creepage region 3 form a "U"-shaped structure as a whole.

The central insert 5 includes an insert 51, the left and right ends of the insert 51 are covered with a fixed ring 52, the fixed ring 52 is in interference connection with the insert 51, and the lower side of the fixed ring 52 is provided with There is a fixed hook 53, and the fixed hook 53 is bolted to the fixed ring 52, and the bolts used to connect the fixed hook 53 and the fixed ring 52 pass through the fixed hook 53 and the fixed ring 52 successively from bottom to top. The upper wall of the wall, the insert 51 and the fixing ring 52, and the fixing hook 53 is a horizontal hook-shaped structure.

The insulating area 1 is formed by pouring epoxy resin-based alumina material, and the epoxy resin-based alumina needs to be added with a curing agent and stirred before pouring.

The self-adaptive area 2 is formed by pouring epoxy resin-based zinc oxide and silicon carbide mixed materials, and the silicon carbide is at least one of micron-sized particles and nano-sized particles.

The creepage zone 3 is one of silicon carbide filler or silicon carbide zinc oxide mixture.

The middle part of the slug 51 is a reserved bolt fixing hole 54, and the number of the reserved bolt fixing holes 54 is multiple, and there are a plurality of depressions and protrusions on the left and right sides of the slug 51. , the diameter depth of the protrusion, and the number of inner diameters are multiple, and the insulating region 1 fits the depression and the protrusion

Example 1

The cured pot insulator can limit the adsorbed space charge during operation, so that the charge is adsorbed in the adaptive area 2, and the resistivity of the insulating area 1 is controlled by the nonlinear special filler in the adaptive area 2, so that this area is on the surface The charge will be turned on before reaching the set charge threshold, and the local resistivity of the self-adaptive zone 2 will be adaptively adjusted, so that the accumulated charge on the surface will discharge through the grounded shell after exceeding a certain value, so as to adaptively adjust the surface charge level and limit the DC drop. The surface charge is always within a safe range; when the resistivity of the adaptive region decreases, the resistivity of the insulating region 2 remains unchanged, which will keep the pot insulator still with high insulation.

Example 2

During operation in a DC environment, the adsorbed space charge can be collected, and the charge can be clamped to the insulating surface area close to the grounded shell, and the resistivity of the insulating area 1 can be adaptively controlled through the non-linear special filler in this area. When the surface When the adsorbed charge is about to reach the set electric field distortion value, adaptively adjust the resistivity of the self-adaptive area, so that the resistivity of the self-adaptive area 2 decreases, which is equivalent to changing the grounding resistance of the surface charge in this area, so that it can pass through the low-resistance Connect the grounded shell for discharge, so as to adaptively adjust the surface charge level, and limit the amount of surface charge under DC to always be within a safe range. At the same time, the resistivity of the insulating region 1 close to the high-voltage conductor will not change, and the original insulation will still be maintained. The pouring process of the pot insulator can be completely based on the existing industrial pouring process, which can be realized only by adding a special filler vacuum mixing tank next to the vacuum mixing tank, and the subsequent secondary curing and demoulding can be completed by using existing technological means .

Example 3

It can be used in DC GIL system as pot insulator after proportional adjustment through the given shape design. However, its scope of application is not limited to this. In power transmission and power supply and distribution equipment, it involves AC and DC power equipment that needs basin insulators to support, including the application cases of air pressure isolation and conductor support. This type of pot insulator 1 can be used to limit the accumulation of surface charges and improve the effect of safe operation and stability of equipment.

Example 4

During operation, under the action of a DC electric field, the two ends of the creepage region 3 will absorb charges of opposite polarities. When the distorted electric field generated by the charges exceeds a certain value, the creepage region 3 is turned on and the resistivity decreases. The charges at both ends of the creepage region 3 are neutralized through the insulator, so as to achieve the effect of self-adaptive dissipation of charges.

The above-mentioned technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention, and some changes that those skilled in the art may make to certain parts reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims (7)

1. High electric spacing charge adaptively dissipation high voltage direct current disc insulator, including insulation layer (1), adaptive area are climbed 1. a kind of (2), the areas Pa electricity (3), which is characterized in that the adaptive area (2) is located at the lower end of the insulation layer (1), the areas Pa electricity (3) Top positioned at the insulation layer (1) is equipped with connecting flange (4) around the adaptive area (2), the insulation layer (1) Middle part is equipped with center abaculus (5).
2. 2. climbing electric spacing height according to the height described in claim 1 climbs the adaptively dissipation high voltage direct current benzvalene form insulation of electric spacing charge Son, which is characterized in that the insulation layer (1), adaptive area (2) are benzvalene form cyclic structure, and the areas Pa electricity (3) are cyclic annular tie Structure, the insulation layer (1), adaptive area (2), the areas Pa electricity (3) pass through moulding by casting, the insulation layer (1), adaptive area (2) " Ω " shape structure is integrally formed, "u"-shaped is integrally formed in the insulation layer (1), the areas Pa electricity (3).
3. 3. climbing electric spacing height according to the height described in claim 1 climbs the adaptively dissipation high voltage direct current benzvalene form insulation of electric spacing charge Son, which is characterized in that the center inserts (5) includes abaculus (51), and the left and right ends of the abaculus (51) are cased with fixed ring (52), the fixed ring (52) connect with the abaculus (51) interference, and the downside of the fixed ring (52) is equipped with stay hook (53), The stay hook (53) is bolted with the fixed ring (52), for connecting the stay hook (53) and the fixed ring (52) Bolt sequentially pass through the stay hook (53), fixed ring (52) lower wall, abaculus (51), fixed ring (52) upper wall from bottom to top, The stay hook (53) is horizontal hook-shape structure.
4. 4. climbing electric spacing height according to the height described in claim 1 climbs the adaptively dissipation high voltage direct current benzvalene form insulation of electric spacing charge Son, which is characterized in that the insulation layer (1) is that epoxy resin-matrix alumina material is poured into a mould to be formed, the epoxy resin-matrix oxidation It needs that curing agent is added before aluminium cast and stirs.
5. 5. climbing electric spacing height according to the height described in claim 1 climbs the adaptively dissipation high voltage direct current benzvalene form insulation of electric spacing charge Son, which is characterized in that the adaptive area (2) is epoxy resin-matrix, the silica hybrid material that is carbonized is poured into a mould to be formed, and the silicon carbide is At least one of micron particles, nano-scale particle.
6. 6. climbing electric spacing height according to the height described in claim 1 climbs the adaptively dissipation high voltage direct current benzvalene form insulation of electric spacing charge Son, which is characterized in that the areas Pa electricity (3) are one kind in silicon carbide filler or Oxidation of SiC zinc mixture.
7. 7. climbing electric spacing height according to the height described in claim 3 climbs the adaptively dissipation high voltage direct current benzvalene form insulation of electric spacing charge Son, which is characterized in that be reserved bolt fixing hole (54), the number of the reserved bolt fixing hole (54) in the middle part of the abaculus (51) Amount is multiple, has multiple recess, protrusion, multiple recess, the diameter of protrusion deep, internal diameter at left and right sides of the abaculus (51) Quantity is multiple, and the insulation layer (1) is mutually agreed with the recess, protrusion.