CN2456279Y

CN2456279Y - Zinc oxide lightning arrester for power lines

Info

Publication number: CN2456279Y
Application number: CN 00259589
Authority: CN
Inventors: 张运庭; 段庆成
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-11
Filing date: 2000-12-11
Publication date: 2001-10-24
Anticipated expiration: 2010-12-11

Abstract

The utility model belongs to the protective electric appliance in alternating current transmission line for line lightning protection. The existing line is additionally provided with a zinc oxide lightning arrester body which is in parallel connected with an insulator string. The body is added with a series gap or a secession device. Series gap zinc oxide lightning arrester is lower more than 17 percents than the characteristic of the lightning action volt one second of the insulator string, and can assure that the failure rate is 0.01 percents. The ampere second of the secession device of the gapless zinc oxide arrester is characterized in that When the industrial frequency short circuit current is 800A, the action time is from 12 to 19 ms; when the industrial frequency short circuit current is 200A, the action time is from 18 to 76 ms. The utility model can increase the line lightning resisting level, and reduces line tripping operation rate. The thunder damage accident rate is reduced to zero, and the normal electrical power supply of the power system is ensured.

Description

The line type zinc oxide arrester

The utility model belongs to the protection electrical equipment that is used for line thunder protection in the transmission line of alternation current.

Developing rapidly of electric utility, thunderbolt circuit and the accident that causes is increasing has a power failure to have had a strong impact on operate as normal and people's life.Be example now with Z province, 35KV, 110KV, three electric pressure circuits of 220KV, the lightning stroke trip number of times had reached 191 times in 1999,1995-1999 lightning stroke trip least number of times year is 139 times, be 220 times the most for many years, the frequent main cause of lightning stroke trip is that the thunderbolt activity is strong, and line lightning resisting level is low; When the thunderbolt cat head, because current potential raises, cause counterattack to make insulator arc-over, if insulator damages, then the lead shorted to earth causes switch trip to have a power failure (as shown in Figure 6), general traditional lightning protection measures effect: 1. the reinforced insulation rate of failure reduces to 62%; 2. adopt multiple coupled ground wire rate of failure to reduce to 56%; 3. reduce the pole tower ground resistance rate of failure and reduce to 45%.

The purpose of this utility model is the defective at the existing line lightning protection, and a kind of line type zinc oxide arrester is provided, and it can improve the lightning withstand level of circuit, reduces the line tripping rate, makes rate of failure can reduce to zero, guarantees the electric power system normal power supply.

The purpose of this utility model is achieved by the following scheme: set up on the line one with the series-parallel line type zinc oxide arrester of insulator, add series gap or add release unit at lightning arrester body.At the circuit that adopts suspended porcelain insulator, can use 110-220KV line type arrester with series gaps, it adds series gap by lightning arrester body and forms, with the line insulator connection in series-parallel, when thunderbolt shaft tower or lightning conducter, the high potential that lightning current causes makes the series gap discharge, and one second characteristic of its thunder and lightning action volt is than porcelain insulating substring paper, can guarantee no longer flashover of insulator, avoid the line tripping power failure.At the circuit that adopts the suspension type synthetic insulator, because synthetic insulator hangs down 20% approximately than the lightning whole wave impact withstand voltage of porcelain insulating substring, can use the arrester without gaps of 35-110KV line type band release unit, with the line insulator connection in series-parallel, utilize the effect of pincers current potential, lightning current has reduced insulator two ends potential difference by behind the lightning arrester, avoids insulator arc-over, damage.And described lightning arrester body mainly is made up of resistor disc post, insulating cylinder, composite sheath, drier, sealed rubber packing ring, spring, conductive strips etc., the resistor disc post is contained in the insulating cylinder, the insulating cylinder two ends are connected with flange by screw thread, establish shoulder in the flange, with extraordinary fastening bolt up and down upper and lower flange, resistor disc post etc. is linked to be an integral body, the sticking outward composite sheath of insulating cylinder all is connected with connector on the flange.The core parts of release unit are the heat explosion type disconnector, and it is made up of energy element, resistor disc, gap, shell etc., and the gap is in parallel with resistor disc, are loaded in the shell together with the energy element.

Lightning arrester body design in the utility model will be linked to be integral body inside and outside flange, insulating cylinder, the resistor disc post etc., and the inside and outside while is stressed, has good seal performance, stressed reasonable, series of advantages such as mechanical strength is high, compact conformation.Detachment device structure uniqueness, when zero-clearance zinc oxide lightning arrester broke down, disconnector can make the automatic and lead disengaging of lightning arrester, and one second characteristic of heat explosion type disconnector action peace is: power frequency short circuit current 800A ± 10% o'clock, be 12-19ms operate time; Power frequency short circuit current 200A ± 10% o'clock, the operating time is 18-76ms, is active in one's movements, and guarantees uninterrupted power supply, can accomplish non-maintaining.One second characteristic of thunder and lightning action volt of arrester with series gaps is lower more than 17% than insulator string, and the interstitial structure discharge stability, and is easy for installation.Thereby the utlity model has advantages such as rational in infrastructure, dependable performance, price are low, and it is low that it has overcome the existing line lightning withstand level, the easy defective that has a power failure of tripping operation, but large-scale popularization is used.

Description of drawings:

Fig. 1 is a line type zero-clearance zinc oxide lightning arrester main body structure schematic diagram;

Fig. 2 is installed in schematic diagram (band release unit) on the tower that dangles for the utility model zero-clearance zinc oxide lightning arrester;

The schematic diagram (band release unit) that Fig. 3 goes up in being installed in mutually for the utility model zero-clearance zinc oxide lightning arrester;

Fig. 4 is a line type band series gap zinc oxide arrester main body structure schematic diagram;

Fig. 5 is that the utility model band series gap zinc oxide arrester is installed in the schematic diagram on the wire jumper;

Fig. 6 damages the switch trip schematic diagram for the thunderbolt cat head causes counterattack, insulator;

Fig. 7 is the schematic diagram that installs series gap zinc oxide arrester additional;

Fig. 8 is the schematic diagram that installs zero-clearance zinc oxide lightning arrester band release unit additional.

Embodiment to the utility model is described further below in conjunction with accompanying drawing:

Fig. 1 is the assembly structure of zero-clearance zinc oxide lightning arrester body 1, it mainly is made up of desiccant box 111, spring 105, conductive strips 104, sealed rubber packing ring 102, flange and the extraordinary fastening bolt etc. of resistor disc post 107, insulating cylinder 108, composite sheath 109, interior dress drier 110, wherein resistor disc post 107 is contained in the insulating cylinder 108, on the insulating cylinder 108 outer sticking composite sheaths 109, insulating cylinder 108 two ends are connected with flange by screw thread, establish shoulder in the flange.Go up extraordinary fastening bolt 106 upper flange 103 and resistor disc post 107 are linked to be an integral body, following extraordinary fastening bolt 112 is linked to be an integral body with lower flange 113 and resistor disc post 107, is provided with connection bolt 101,114 on flange.

Fig. 4 is the assembly structure of the zinc oxide arrester body 1 of band series gap, its structure and zero-clearance zinc oxide lightning arrester structure shown in Figure 1 are basic identical, different and the following connection bolt 14 design balling-up pin binding posts 115 of the quantity that its difference part is a resistor disc are so that connect with the bowl pin in the series gap.

Embodiment one: tower zero-clearance zinc oxide lightning arrester installation diagram (with reference to Fig. 2) dangles

Fix a hold-down arm 8 at original tower arm end, use general part ball-eye 5, suspended porcelain insulator 6, socket-clevis eye 7 that zero-clearance zinc oxide lightning arrester 1 (structure is with reference to Fig. 1) is suspended on the hold-down arm 8 then, make this lightning arrester 1 in parallel with the former synthetic bar type insulator string 11 that is installed in tower arm end.The lightning arrester lower end is made mechanical connection by insulation gap rod 9 and T molded lines folder 10 with lead, guarantees that lead and lightning arrester 1 have enough insulation distances.Release unit 3 is done electric the connection with lightning arrester, lead.Under normal circumstances by lightning current and switching overvoltage electric current, the heat explosion type disconnector all is failure to actuate; Under abnormal conditions, when zero-clearance zinc oxide lightning arrester 1 damaged, power current was by disconnector, and disconnector energy action message makes the automatic and lead disengaging of lightning arrester; Insulation gap rod 9 keeps between lead and the lightning arrester enough insulation distances being arranged.

Embodiment two: middle phase zero-clearance zinc oxide lightning arrester (angle mount figure is with reference to Fig. 3)

On original shaft 17, fix an outdoor pillar porcelain insulator 14, one support 13 and a T-shape cable clamp 12 are installed at the insulator top, release unit 3 links to each other with zero-clearance zinc oxide lightning arrester 1 upper end with T-shape cable clamp 12, the lightning arrester lower end links to each other with an insulator foot 15 with active section, insulator foot 15 is fixed on the installing rack 16, and installing rack 16 is fixed on shaft 17.

Embodiment three: band series gap zinc oxide arrester (installation diagram is with reference to Fig. 5)

Utilize general part ball-eye 18, suspension insulator 19 and socket-clevis eye 20 to link to each other at original tower arm with leakage conductor body 1 (as shown in Figure 4) terminal, the series gap 2 of leakage conductor links to each other with lightning arrester body 1 lower end, series gap 2 lower ends socket-clevis eye 20, suspension clamp 21 links to each other with lead.Form and series gap 2 installs grading ring 4 additional by bar type synthetic insulator two ends, grading ring 4 is the bell-jar structure, and spacing distance is respectively 460mm and 960mm.

Claims

1. line type zinc oxide arrester is characterized in that: set up on the line one with the series-parallel zinc oxide arrester body of insulator (1), add series gap (2) or release unit (3) at lightning arrester body (1); And described lightning arrester body (1) is mainly by resistor disc post (107), insulating cylinder (108), composite sheath (109), drier (110), spring (105), sealed rubber packing ring compositions such as (102), resistor disc post (107) is contained in the insulating cylinder (108), insulating cylinder (108) two ends are connected with flange by screw thread, establish shoulder in the flange, with extraordinary fastening bolt (106 up and down, 112) will go up, lower flange (103,113), resistor disc post (107) etc. is linked to be an integral body, inside and outside stressed, the outer sticking composite sheath (109) of insulating cylinder (108), all be connected with the wiring connector on the flange, connection bolt or ball pin binding post.

2. line type zinc oxide arrester as claimed in claim 1 is characterized in that: described series gap (2) installs grading ring (4) additional by bar type synthetic insulator two ends to be formed, and grading ring (4) is the bell-jar structure, and clearance distance is respectively 460mm and 960mm.

3. line type zinc oxide arrester as claimed in claim 1, it is characterized in that: described release unit (3) is made up of core parts heat explosion type disconnector and conductor spacer etc., this disconnector is made of energy element, resistor disc, gap, shell etc., the gap is in parallel with resistor disc, is loaded in the shell together with the energy element.