CN102930943B - A kind of pure air series gap type UHVAC transmission line spark gap - Google Patents

Abstract

The present invention provides a pure air series gap AC UHV line arrester. The arrester includes a arrester body and a series gap group. Gaps in series, the series gap group is connected to the high voltage end of the arrester body; the height of the arrester body is 4-6m, and the distance between the gaps is 2.0-2.4m. The pure air series gap type AC ultra-high voltage line lightning arrester provided by the invention has the advantages of simple structure, small volume and convenient installation; the gap adjustment range is large; the technical parameter is reasonable and has good application prospect.

Description

A Pure Air Series Gap Type AC UHV Line Surge Arrester

technical field

The invention relates to a lightning arrester, in particular to a pure air series gap AC ultra-high voltage line lightning arrester.

Background technique

Engineering usually uses methods such as reducing grounding resistance, erecting double lightning conductors, and reducing the protection angle of lightning conductors to limit lightning overvoltage and reduce lightning tripping rates. However, in the mountainous line section where the lightning activity is strong and it is difficult to reduce the grounding resistance, the above methods cannot fundamentally solve the problem of lightning tripping.

The utility model patent with the application number of 201020537907.9 discloses an ultra-high voltage AC arrester, which includes multi-section arrester elements connected in series, and a voltage equalizing device and an insulating base at the bottom of the arrester element respectively. The connected resistance sheet is connected to the upper and lower end caps through insulating rods, and is sealed in the porcelain sleeve. The potential distribution of the arrester along the axial direction is controlled by the external pressure equalizing device connected to the upper end of the arrester element.

At present, there are already 500kV and below line arresters in actual operation at home and abroad. The sum of the distance between the arrester body and the gap is generally greater than the length of the insulators connected in parallel. Special fittings need to be designed to solve the problem of mismatching installation space, and the installation is difficult. Due to the increase of the voltage level, the height and weight of the UHV line arrester body will inevitably be greater than that of the 500kV and below line arrester, and the installation will be more difficult; currently there is no test data on the air gap and insulation coordination of the UHV line arrester. And the design is difficult.

This requires the concept of miniaturization applied in UHV line arresters to design miniaturized UHV line arresters to reduce installation difficulty; it is necessary to determine the body size and clearance distance of UHV line arresters.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a pure air series gap type AC UHV line arrester, which has a simple structure, small size, and convenient installation; the gap adjustment range is large; the technical parameters are reasonable, and it has a good application prospect.

In order to realize the above-mentioned purpose of the invention, the present invention takes the following technical solutions:

A pure air series gap type AC UHV line surge arrester, the arrester includes a surge arrester body and a series gap group, the arrester body includes a jacket, a resistance sheet and arrester components connected in series, and the series gap group includes gaps connected in series , the series gap group is connected to the high voltage end of the arrester body; the height of the arrester body is 4-6m, and the distance between the gaps is 2.0-2.4m.

The height of the arrester body is 4.6m.

The creepage distance of the arrester body is not less than 10200mm.

The dry-arcing distance of the jacket is not less than 4.6m, so that the arrester body can withstand a lightning impulse voltage not lower than 1.25 times its actual protection level, and can withstand not less than 635kV power frequency voltage for 1min.

The diameter of the resistor sheet is 75-100mm, so that the resistor sheet can pass the long-duration impulse current test of not less than 1500A and pass the 4/10μs high-current impulse withstand test with an amplitude of 100kA for three consecutive times.

The rated voltage of the lightning arrester is 768kVrms, the reference voltage is not less than 1086kV at 2mA DC, the nominal discharge current is 30kA, the residual voltage is not greater than 2150kV at 30kA lightning impulse current, and not greater than 2365kV at 30kA steep wave impulse current.

The distance between the gaps is 2.1-2.3m.

The gap includes two electrodes, one of which is connected to the high-voltage end of the arrester body, and its metal tube or metal rod diameter is not less than 80mm, and the other electrode is installed on the transmission line conductor, and its metal tube or metal rod diameter is not less than 200mm.

The standard lightning impulse 50% discharge voltage of the arrester is not greater than 2900kV; the operating impulse withstand voltage is not less than 1600kV; when the arrester body fails, it can withstand the power frequency voltage of not less than 700kV for 1min under the specified raining conditions, When there is no abnormality, it can withstand the power frequency voltage of not less than 889kV for 1min under the specified raining conditions.

Compared with the prior art, the beneficial effects of the present invention are: the pure air series gap type AC UHV line arrester provided by the present invention has simple structure, small volume, and convenient installation; the gap adjustment range is large; the technical parameters are reasonable, and it has good performance. Application prospects.

Description of drawings

Figure 1 is a schematic diagram of the test and installation of pure air series gap type AC UHV line arrester;

Fig. 2 is a schematic diagram of the arrester body of the AC UHV line arrester;

Fig. 3 is a schematic diagram of the relationship between the discharge voltage and the gap distance of an AC UHV line arrester.

detailed description

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

As shown in Figures 1-3, a pure air series gap type AC UHV line arrester, the arrester includes a arrester body and a series gap group, the arrester body includes a jacket, a resistance sheet and a series-connected arrester element, the series The gap group includes gaps connected in series in sequence, and the series gap group is connected to the high-voltage end of the arrester body; the height of the arrester body is 4-6m, and the height of 4.6m is optimal.

The distance between the gaps is 2.0-2.4m, preferably 2.1-2.3m.

The creepage distance of the arrester body is not less than 10200mm.

The dry-arcing distance of the jacket is not less than 4.6m, so that the arrester body can withstand a lightning impulse voltage not lower than 1.25 times its actual protection level, and can withstand not less than 635kV power frequency voltage for 1min. The arrester body can pass a short-circuit test with an effective value of 60kA and a duration of not less than 0.1s.

The diameter of the resistor sheet is 75-100mm, so that the resistor sheet can pass the long-duration impulse current test of not less than 1500A and pass the 4/10μs high-current impulse withstand test with an amplitude of 100kA for three consecutive times.

The rated voltage of the lightning arrester is 768kVrms, the reference voltage is not less than 1086kV at 2mA DC, the nominal discharge current is 30kA, the residual voltage is not greater than 2150kV at 30kA lightning impulse current, and not greater than 2365kV at 30kA steep wave impulse current.

The gap includes two electrodes, one of which is connected to the high-voltage end of the arrester body, and the diameter of its metal tube or metal rod is not less than 80mm, and the other electrode is installed on the wire of the transmission line, and its metal tube or metal rod has a diameter of not less than 200mm.

The standard lightning impulse 50% discharge voltage of the arrester is not greater than 2900kV; the operating impulse withstand voltage is not less than 1600kV; when the arrester body fails, it can withstand the power frequency voltage of not less than 700kV for 1min under the specified raining conditions, When there is no abnormality, it can withstand the power frequency voltage of not less than 889kV for 1min under the specified raining conditions.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (1)

1. A pure air series gap type AC UHV line arrester, characterized in that: the arrester includes a arrester body and a series gap group, the arrester body includes an overcoat, a resistance sheet and a series-connected arrester element, and the series gap The group includes gaps connected in series in sequence, and the series gap group is connected to the high-voltage end of the arrester body; the height of the arrester body is 4-6m, and the distance between the gaps is 2.0-2.4m; The creepage distance of the arrester body is not less than 10200mm; The dry-arcing distance of the jacket is not less than 4.6m, so that the arrester body can withstand a lightning impulse voltage not lower than 1.25 times its actual protection level, and can withstand not less than 635kV power frequency voltage for 1min; The diameter of the resistance sheet is 75-100mm, so that the resistance sheet can pass the long-duration impulse current test of not less than 1500A and pass the 4/10μs high-current impulse withstand test with an amplitude of 100kA for three consecutive times; The rated voltage of the arrester is 768kVrms, the reference voltage is not less than 1086kV at DC 2mA, the nominal discharge current is 30kA, the residual voltage is not greater than 2150kV at 30kA lightning impulse current, and not greater than 2365kV at 30kA steep wave impulse current; The standard lightning impulse 50% discharge voltage of the arrester is not greater than 2900kV; the operating impulse withstand voltage is not less than 1600kV; when the arrester body fails, it can withstand the power frequency voltage of not less than 700kV for 1min under the specified raining conditions , it can withstand a power frequency voltage of not less than 889kV for 1min under the specified raining conditions when there is no abnormality; The gap includes two electrodes, one of which is connected to the high-voltage end of the arrester body, the diameter of the electrode connected to the high-voltage end of the arrester body is not less than 80mm, and the other electrode is installed on the wire of the transmission line, installed on the transmission line The diameter of the electrode on the wire is not less than 200mm.