CN107240914A - Electronic high-voltage arrester - Google Patents

Abstract

The present invention provides a kind of electronic high-voltage arrester, including multiple single-stage components, overcoat, full skirt；Multiple single-stage components are superimposed to form tandem type structure, are locked in overcoat, and full skirt is set on the coat；Each single-stage component, which includes two disc connection electrodes, high-power TVS pipe array, epoxy glass fiber reinforced plastic cylinders up and down, can effectively solve the problem of current high-voltage arrester is slow to lightning surge response speed, protection residual voltage is high; there is high-power TVS pipe structure simultaneously; combined by multiple series and parallel mode, realize clamp and the protection of transient overvoltage.

Description

Electronic high voltage arrester

technical field

The invention relates to an electronic high-voltage arrester that can be used for overvoltage protection in electric power systems, in particular to a high-voltage arrester for transient overvoltage protection that has a high-power TVS tube structure and is composed of multiple series and parallel connections.

Background technique

Currently commonly used high-voltage zinc oxide arresters have the problems of slow response speed and high residual voltage. Transient suppressor diodes (TVS) are widely used semiconductor protection devices with extremely fast response time and low clamping voltage. As a high-power pulse switching device, TVS has important applications in the technical field of high-power pulse and repetition frequency pulse power. At the same time, it is widely used in equipment protection or circuit protection from static electricity, transient voltage generated during inductive load switching, and lightning induced overvoltage. The instantaneous pulse power that TVS diodes can withstand can reach hundreds of kilowatts, and its response time is only 1ps. However, the existing electronic lightning protection devices have low operating voltage and cannot be applied to high-voltage systems.

Contents of the invention

In view of the above problems, the present invention provides a novel electronic high-voltage arrester, which has the advantages of fast overvoltage response speed and low residual voltage under high-voltage environment.

The present invention adopts following technical scheme to realize:

An electronic high-voltage arrester, including a plurality of single-stage components (6), a jacket (7), an umbrella

Skirt (8); a plurality of single-stage components (6) are stacked to form a series structure, sealed in the jacket (7), and the umbrella skirt (8) is arranged on the jacket (7); each single-stage component (6 ) including the upper and lower disc-shaped connecting electrodes, the high-power TVS tube array (2), and the epoxy glass steel cylinder (4); the upper and lower disc-shaped connecting electrodes are respectively the first disc-shaped connecting electrode (1) and the second disc-shaped connecting electrode Two disk-shaped connecting electrodes (5).

The upper and lower two disk-shaped connecting electrodes are used to connect the high-power TVS tube array, and are also used for external connection of single-stage components; the high-power TVS tube array (2) adopts a plurality of TVS tubes arranged in series and parallel The upper and lower discs are connected between the electrodes.

The epoxy glass fiber reinforced plastic cylinder (4) is located between the upper and lower disc-shaped connecting electrodes, outside the high-power TVS tube array (2), and closes and protects the TVS tube between the two electrodes.

The side of the epoxy glass steel cylinder (4) is provided with exhaust holes (3) for dissipating the heat generated when the high-power TVS tube array is working.

Compared with the prior art: the response time of the electronic high-voltage arrester of the present invention is faster than that of ordinary high-voltage arresters, its response time is sub-nanosecond level, the volt-ampere characteristics are superior, and the ideal nonlinear voltage clamping characteristics are basically achieved, and the response The residual pressure is relatively low.

Description of drawings

Fig. 1 is a schematic diagram of an electronic high-voltage arrester after a plurality of single-stage components are connected in series according to the present invention.

Fig. 2 is a structural diagram of a single-stage assembly in the electronic high-voltage arrester of the present invention.

Among them, 1-the first disc-shaped connecting electrode, 2-high-power TVS tube array, 3-venting hole, 4-epoxy glass fiber reinforced plastic cylinder, 5-the second disc-shaped connecting electrode, 6-single-stage assembly, 7 - coat, 8 - umbrella skirt.

detailed description

The invention provides a cascaded electronic high-voltage lightning arrester, in which a plurality of single-stage components of the lightning arrester are connected in series to form a high-voltage lightning protection system with different voltage levels. The single-stage component of the arrester is composed of two disc-shaped connecting electrodes, a high-power TVS tube array, an epoxy glass steel cylinder and an exhaust hole. The first-stage high-power TVS tube array is formed by connecting multiple TVS tubes in parallel to form a single-stage arrester assembly, and then simply connected in series by multiple single-stage assemblies.

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

As shown in Figure 1, this electronic high-voltage arrester adopts a series structure, and the protection voltage provided by each stage is the same. When it needs to be applied in systems with different voltage levels, multi-stage arresters can be directly used in series.

As shown in Figure 2, the single-stage component 6 is composed of two disc-shaped connecting electrodes (1, 5), a high-power TVS tube array 2, an epoxy glass steel cylinder 4, and an exhaust hole 3. Among them, the upper and lower disc-shaped connecting electrodes are made of metal materials, which are used to connect high-power TVS tube arrays, and are also used to connect external circuits. The high-power TVS tube array is composed of multiple TVS diodes connected in series and parallel. The selection of TVS should follow the following principles: the clamping voltage of TVS is not greater than the maximum allowable safe voltage of the protected component; the forward surge current of TVS is the same as that of TVS diodes. The product of the number is not less than the size of the lightning current; within the specified pulse duration, the maximum peak pulse power consumption of TVS must be greater than the peak pulse power that may occur in the protected circuit; the transient voltage suppressor can be used at -55~+150°C The electronic high-voltage surge arrester of the present invention needs TVS to work at a changing temperature, because its reverse leakage current increases with the increase of temperature, and the power consumption decreases with the increase of TVS junction temperature, from +25°C to +175°C, about 50% linear decrease, the breakdown voltage increases with temperature, so when selecting the TVS model, it is necessary to consider the influence of the temperature change on its characteristics. Epoxy fiberglass cylinders are used to enclose and protect the high-power TVS tube arrays. There are exhaust holes on the side of the epoxy glass fiber reinforced plastic cylinder, which are used to timely discharge the heat generated when the electronic high-voltage arrester of the present invention is in operation.

When lightning strikes the electronic high-voltage arrester of the present invention, the lightning current flows through the electronic high-voltage arrester of the present invention. The high-level speed changes the high impedance between the two poles to low impedance, and at the same time absorbs the surge power generated by lightning, so that the voltage between the two poles is clamped at a safe value, effectively protecting the safe operation of the transmission line.

Claims (4)

1. An electronic high-voltage arrester, characterized in that it includes multiple single-stage components (6), jackets (7), and sheds (8); multiple single-stage components (6) are stacked to form a series structure, sealed In the jacket (7), the umbrella skirt (8) is set on the jacket (7); each single-stage assembly (6) includes two disc-shaped connecting electrodes, a high-power TVS tube array (2), a ring Oxygen fiberglass cylinder (4). 2. The electronic high-voltage arrester according to claim 1, characterized in that: the upper and lower disc-shaped connecting electrodes are used to connect the high-power TVS tube array, and are used for the external connection of the single-stage assembly; the large The power TVS tube array (2) adopts multiple TVS tubes arranged in series and parallel between the upper and lower disc-shaped connecting electrodes. 3. The electronic high-voltage arrester according to claim 2, characterized in that: the epoxy glass fiber reinforced plastic cylinder (4) is located between the upper and lower disc-shaped connecting electrodes, and is located outside the high-power TVS tube array (2) , close and protect the TVS tube between the two electrodes. 4. The electronic high-voltage arrester according to any one of claims 1-3, characterized in that: the side of the epoxy glass fiber reinforced plastic cylinder (4) has vent holes (3) for distributing high-power TVS The heat generated when the tube array works.