A kind of high resistance of 330kV for high altitude localities loop
Technical field
The invention belongs to extra-high tension unit device field, be specially a kind of high resistance of 330kV for high altitude localities loop.
Background technology
Along with growth at full speed and the national grid planning of national economy, China 330kV supergrid will have more Construction and operation in high altitude localities.High altitude localities 330kV transformer station compares with the following area of height above sea level 1000m, and it will propose high requirement to air gap, equipment outer insulation, thereby directly has influence on composition and the layout of power distribution equipment; Often landform is limited due to high altitude localities, needs the measure of considering that various saving are taken up an area; Simultaneously,, due to its special environmental quality, also have higher requirement to installation, maintenance etc. in high altitude localities.
At present in built all 330kV transformer stations that put into operation, " six elements " connected mode is adopted in 330kV high resistance loop always, be that high resistance loop equipment comprises GIS, outlet voltage transformer, outlet lightning arrester, isolating switch, high resistance lightning arrester, high resistance, amount to six elements.The outlet voltage transformer is because equipment is comparatively ripe, the existing open type that all adopts; The purpose that isolating switch is set arranges obvious cut-off point while mainly being to overhaul high resistance; It is because after arranging isolating switch, high resistance is far away apart from the outlet lightning arrester that outlet lightning arrester and high resistance lightning arrester arrange separately, is difficult to effectively be protected, and therefore the high resistance lightning arrester must be set separately high resistance is realized protection.For easy to connect, the locating of high resistance wiring all adopts flexible conductor to pass from the grading ring top.This scheme high resistance loop equipment is more, invests greatlyr, and floor space is very large, and pollution flashover point is more, is unfavorable for the high altitude localities expropriation of land, also be unfavorable for operating maintenance, and high resistance binding post place corona is more serious.
Summary of the invention
The problem that the present invention solves is to provide a kind of high resistance of 330kV for high altitude localities loop, and its structure forms simple, and floor space is little, and operational reliability is strong, and pollution flashover point is few.
The present invention is achieved through the following technical solutions:
A kind of high resistance of 330kV for high altitude localities loop, is characterized in that, GIS, lightning arrester, high resistance and wire, consists of; Be built-in with the outlet voltage transformer in described GIS; Described lightning arrester is used for the lightning-arrest of taking shelter from the thunder of outlet and high resistance simultaneously; High resistance and lightning arrester by wire connects successively, after wire is in parallel, together be connected to outlet by wire with GIS.
Preferably, after the binding post of described GIS is connected via wires to insulator string, then with outlet, be connected.
Preferably, described insulator string is arranged on the framework that connects ground wire.
Preferably, the distance between described lightning arrester and high resistance is no more than 10 meters.
Preferably, described wire adopts flexible conductor.
Preferably, described high resistance adopts double-deck grading ring.
Preferably, wiring place of high resistance and wire, wire passes setting in the middle of double-deck grading ring.
Compared with prior art, the present invention has following useful technique effect:
A kind of high resistance of 330kV for high altitude localities of the present invention loop, wherein, the outlet voltage transformer is built in GIS the GIS built-in voltage instrument transformer technology of utilizing, can reach the effect of existing equipment, simultaneously price is not high, and has blocked contacting of outlet voltage transformer and air, has reduced the equipment amount that exposes in GIS, reduce the pollution flashover point, improved reliability; Existing 330kV high resistance is all moved simultaneously with outlet or is stopped transport simultaneously, does not have namely that outlet is charged and high resistance withdraws from this operating mode of maintenance, therefore the isolating switch of high resistance special use can be cancelled; After cancelling isolating switch; high resistance and outlet lightning arrester Distance Shortened; can effectively be protected; outlet lightning arrester and high resistance lightning arrester can be merged setting, thereby can save the equipment amount of half at least, only need to adopt the structure of " three elements " to form; apparatus body and infrastructure investment have been saved; significantly reduced expropriation of land, floor space, saved operating expenses and operating maintenance cost, be highly suitable for high altitude localities and use.Adopt " three elements " of the present invention scheme, high resistance loop longitudinal size is 25m, more former longitudinal size is that 41.5m's " six elements " scheme can be saved the longitudinal size 16.5m of power distribution equipment, save high resistance loop floor space 39.76%, reduction effect is extremely remarkable, and due to the dwindling of size, a lightning arrester also can play good lightning protection effect.Adopt simultaneously " three elements " of the present invention scheme, can save the expense of 500,000 yuan than each group high resistance loop of " six elements " scheme in prior art, if there are 10 high resistance loops in some power stations, the expense of saving is just 5,000,000 yuan, and effect is very remarkable.
Further, adopt flexible conductor to connect GIS, lightning arrester and high resistance, improved the convenience of construction, operation and maintenance; Because the high altitude localities corona discharge is comparatively serious, particularly high resistance binding post place is particularly evident, and therefore in the junction of high resistance and wire, wire passes through in the middle of double-deck grading ring, the noise that reduces corona loss and cause; After the binding post of GIS is connected via wires to insulator string, then with outlet, be connected, guaranteed the safety and reliability of construction, operation and maintenance.
Description of drawings
Fig. 1 is the schematic diagram of structure described in example of the present invention.
In figure: 1 is GIS; 2 are the outlet voltage transformer; 3 is lightning arrester; 4 is high resistance; 5 is framework; 6 is insulator string; 7 is wire.
Embodiment
The present invention is described in further detail below in conjunction with specific embodiment, and the explanation of the invention is not limited.
Referring to Fig. 1, a kind of high resistance of 330kV for high altitude localities loop, be comprised of GIS1, lightning arrester 3, high resistance 4 and wire 7; Be built-in with outlet voltage transformer 2 in described GIS1; Described lightning arrester 3 is used for the lightning-arrest of taking shelter from the thunder of outlet and high resistance 4 simultaneously; High resistance 4 and lightning arrester 3 by wire 7 connects successively, after wire 7 is in parallel, together be connected to outlet by wire 7 with GIS1.Wherein, wire 7 adopts flexible conductor; High resistance 4 adopts double-deck grading ring, wiring place of high resistance 4 and wire 7, and wire 7 passes setting in the middle of double-deck grading ring, and corona loss is little, and the noise that causes is low.The binding post of GIS1 after wire 7 is connected to insulator string 6, then is connected with outlet.Distance between lightning arrester 3 and high resistance 4 is no more than 10 meters, can realize good protection to high resistance 4.As shown in Figure 1, insulator string 6 is arranged on framework 5, and framework 5 supports on the ground, and top is connected with ground wire, thereby guarantees insulation requirements and the security performance in high resistance loop.
Outlet voltage transformer 2 is built in GIS1, has reduced the occupation of land of outlet voltage transformer 2; Cancel isolating switch, directly can save its investment and occupation of land; Outlet lightning arrester and high resistance lightning arrester are merged,, only with a lightning arrester 3,, by with high resistance 4, with outlet, being connected and being connected, realize original function, save former high resistance lightning arrester investment and take up an area; After high resistance 4 adopted double-deck Equalized voltage ring construction, by the grading ring size rationally is set, wire 7 can pass in the middle of double-deck grading ring, reduces corona loss.
Can draw by above-mentioned analysis, the structure in 330kV high resistance of the present invention loop forms and connects, have the equipment investment of reducing, reduce to take up an area, reduce the installation and repairing quantities, improve reliability, improve convenience, reduce the advantages such as corona loss and noise, can apply in engineering, and provide a new Scheme Choice for the high resistance loop design.
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by claims of submitting to.