Current, the operation of high voltage combined switch electrical equipment and even ultra high voltage composite switch apparatus and three difficult problems manufacturing existence.
First, be about the little current capacity of septal line trackside isolating switch folding (capacitance current, inductive current), how to meet actual requirement.Along with developing rapidly of electric power system, the circuit of parallel lines on same tower is more and more, and it is more and more higher that operation of power networks operation suits faradic requirement to isolating switch, earthed switch, and IEC, country, industry have been formulated corresponding standard to this.Present problem is, the correlation test carrying out according to existing standard, can not meet actual needs, or induced voltage is lower than actual demand, or induced current is less than actual demand.One of reason having problems is: the circuit of parallel lines on same tower with voltage only considered in standard formulation, and is in fact more the circuit of the different voltages of parallel lines on same tower.The circuit of this parallel lines on same tower, the isolating switch of low-voltage-grade, induced voltage, the electric current that earthed switch need to suit, all than high-tension height, exactly different from current standard.
Secondly be, the raising about isolating switch bus switching current ability.In China, in the type approval test of 252kV GIS transmitting current of isolation switch switching bus bar ability, general changing voltage carries out type approval test by IEC standard, and specify in IEC standard: 252kV combined electrical apparatus bus changing voltage is 20V, well below the 100V requirement of above-mentioned electricity power engineering; In actual motion, due to bus connection switch likely due to fault but not complete operation, the therefore calculating to bus changing voltage and imagination, the accident that can not prevent bus conversion operations to occur.
Last problem is high speed grounding switch HSGS(High Speed Grounding Switches) manufacture and use.The fault of ultra-high-tension power transmission line more than 90% is single phase ground fault, and in single phase ground fault, approximately has 80% for " instantaneity " fault.In China, 330kV, 500kV circuit adopt single-pole reclosing mode to eliminate single phase ground fault mostly, improve the stability of system and the reliability of power supply.The success or not of single-pole reclosing depends on that can the latent electric arc that supplies of fault point put out certainly.Scene is moved with test and is shown, under stable state, the amplitude of secondary arc current and recovery voltage is two decisive factors of diving and certainly going out for electric arc; The method of Secondary Arc Extinction mainly contains high voltage reactor neutral point and connects little reactance and use HSGS(High Speed Grounding Switches) two kinds.The former is at home and abroad used widely, and the latter is used in the built UHV system of Japan.Shorter for those circuits, need not connect reactor restriction power-frequency overvoltage, though or have reactor to be connected on bus, be not the situation of establishing for certain circuit, cannot use the former method and can only adopt the latter.HSGS is actual is exactly a high-speed switch being started by relaying protection, and still, existing earthing isolator all can not meet above-mentioned functions.
Summary of the invention
For the drawback of prior art, the object of the invention is to propose a kind of double-break type (DCB) type outdoor gas insulation metal-enclosed type high-voltage combined electrical apparatus.
The dual-breaker DCB type high-voltage combined electrical apparatus that the present invention proposes, it comprises support, voltage transformer, current transformer, sleeve pipe or cable tank, three-station isolating/grounding switch, breaker mechanism, tank body and central console, wherein,
Described breaker structure comprises that symmetry is arranged on two circuit breakers in tank body, and be provided with insulated support between two arc control device of two circuit breakers, described two arc control device are the tapped double-fracture formula arc control device of Intermediate Gray, above the upper and lower both sides of tap and symmetrical two circuit breakers installing, be respectively arranged with first, second, third and the 4th three-station isolating/grounding switch, wherein first, second, and third three-station isolating/grounding switch connects sleeve pipe or the cable tank of installing current transformer, and the 4th three-station isolating/grounding switch connects voltage transformer;
Described tank body and central console are packed on support, and described central console connects respectively controls two circuit breakers, quadruplet tri-station isolating switch;
The interior insulation gas filled interior insulation of doing of described sleeve pipe or cable and tank body, adopts insulating gas to do interior insulation in described arc control device.
Further, described insulating gas is SF
Further, described two circuit breakers have spring operating mechanism separately.
Further, two arc control device share a tank body.
Further, two circuit breakers are connected at the insulated support place of fixed contact.
Further, four groups of tri-station isolating switchs coexist in a tank body.
Further, described sleeve pipe is compound insulating sleeve or porcelain insulating sleeve.
The dual-breaker DCB type high-voltage combined electrical apparatus that the present invention proposes, adopts back-to-back two circuit breakers, and Substation Design longitudinal size is greatly reduced.It adopts band centre tap formula double break shape of the mouth as one speaks arc control device arc extinguishing, compound insulating sleeve or cable tank are arranged on arc control device both sides and centre tap place, tri-station isolating switch is installed below, and sleeve pipe or cable tank bottom suit electric current, voltage transformer, fill SF in sleeve pipe or cable and tank body
6do interior insulation, between arc control device and tank body, adopt SF
6gas does interior insulation, and circuit breaker is joined spring operating mechanism, and tri-station isolating switch adopts high-purity SF
6gas does interior insulation, described high-purity SF
6gas is 0.5MPa, more than make the little current capacity of isolating switch folding (capacitance current, inductive current) in the present invention strengthen, bus switching current ability (switching current, changing voltage) strengthens, can meet Digitized transformation demand, reduced floor space, shortened the set-up time, reliability and the fail safe of equipment are improved, and can adapt to most applied environments, cost is lower, be convenient to standardization manufacture.
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that embodiment described herein is only for explaining the present invention, instead of for limiting the present invention.
As shown in Figure 3, in the dual-breaker DCB type high-voltage combined electrical apparatus proposing in the present invention, circuit connecting mode is: two ends bus is connected with circuit breaker with three-station isolating/grounding switch by current transformer respectively, central console is arranged on circuit breaker and three-station isolating/grounding switch bottom, two circuit breaker static contact ends connect output and draw terminal one time by sleeve pipe or cable tank, and before drawing, connect a voltage transformer.
As shown in Figure 1, the dual-breaker DCB type high-voltage combined electrical apparatus that the present invention proposes, is made up of support 7, voltage transformer 5, current transformer 4, sleeve pipe or cable 1, three-station isolating/grounding switch 2, breaker mechanism 3, tank body and central console 6, wherein,
Described breaker mechanism 3 comprises that symmetry is arranged on two circuit breakers in tank body, and be provided with insulated support between two arc control device of two circuit breakers, the arc control device of two circuit breakers are the double-fracture formula arc control device with centre tap formula, as shown in Figure 1, arc control device are set to described breaker mechanism and comprise that symmetry is arranged on two circuit breakers in tank body, and be provided with insulated support between two arc control device of two circuit breakers, described two arc control device are the tapped double-fracture formula arc control device of Intermediate Gray, between the upper and lower both sides of tap and the symmetrical moving contact of installing and circuit breaker, be respectively arranged with first, second, the third and fourth three-station isolating/grounding switch 2, wherein first, second is connected sleeve pipe or the cable tank 1 of installing current transformer 4 with the 3rd three-station isolating/grounding switch, the 4th three-station isolating/grounding switch connects voltage transformer 5, the interior insulation gas filled interior insulation of doing of sleeve pipe or cable tank and tank body, adopts insulating gas to do interior insulation in arc control device and between arc control device and tank body.
With the double-fracture pattern arc control device of centre tap formula, this arranges and specifically comprises two groups of moving contacts 10 and fixed contact 11, and wherein, every group of moving contact 10 is connected with insulated support 12 respectively with fixed contact 11.
In the preferred embodiment of the present invention, described insulating gas is SF
6, described high-purity SF
6atmospheric pressure is 0.5MPa, increases device security.
Described two cover circuit breakers have spring operating mechanism separately, can realize far distance controlled or manual on the spot.
As shown in Figure 2, in the time of practical application, two arc control device share a tank body, and two cover circuit breakers share an outlet tri-station isolating switch, and four groups of tri-station isolating switchs coexist in a tank body.
Described sleeve pipe is compound insulating sleeve, is generally use silastic material, and under particular surroundings, as high height above sea level, extremely frigid zones should configure porcelain bushing.
Dual-breaker DCB type high-voltage combined electrical apparatus disclosed by the invention, integrally-built design adopts potting breaker structural configuration, is convenient to on-the-spot whole Transporting and installation.Circuit breaker uses double-fracture SF
6arc control device, use sulfur hexafluoride gas as insulation, and by high voltage isolator integrated design, form overall HGIS high-voltage combined electrical apparatus.Three-phase is contained on a shared under casing, and every phase can share or be furnished with separately spring operating mechanism.This high-voltage combined electrical apparatus can meet Digitized transformation demand, reduced floor space, shortened the set-up time, improved reliability and the fail safe of equipment.
Specifically, dual-breaker DCB type high-voltage combined electrical apparatus provided by the present invention is the New Combined Switchgear of the equipment composition such as two circuit breakers and many group isolating switches and many group electric currents, voltage transformer in fact, as shown in Figure 4, middle one group of sleeve pipe or cable tank are outlet casing tube, for connecting the line of transformer station.The sleeve pipe on both sides or cable tank are bus casing or cable termination, for connecting two groups of buses of transformer station.
When this equipment is when being subject to electric switch, be defined as and be subject to electric operational mode, as shown in Figure 5, DS
2in closing position, ES
1in "on" position, CB
1in stand-by state, to use as high speed grounding switch.
When this equipment is when sending switch, be defined as and send operational mode, as shown in Figure 6, DS1 and DS
2all in closing position, CB
2one of in "on" position, another group is in stand-by state.
In practical application, parallel lines on same tower or long more and more apart from transmission lines in parallel, in Cubicle Gas-Insulated Switchgear (GIS), the requirement of the opening and closing induction current ability of line side earthed switch (electromagnetic induction, electrostatic induction) is more and more higher.Use DCB type HGIS equipment provided by the present invention to solve very ideally this problem, ground connection operation can be divided into two kinds of situations:
1, the operation of line maintenance state (FES) (see figure 5).Its operating process is first to disconnect respectively CB
2, then the CB that closes
1, make circuit in ground state, at this moment circuit just can carry out normal repair and maintenance work.Its advantage is in operating process, has electricity once circuit, and the short circuit current that can effectively utilize line side CT to measure starts relaying protection tripping circuit breaker, to reduce the impact of misoperation to electrical network.Under normal circumstances, close between dead line and adjacent alive circuit by earthed switch (FES) the inductive grounding electric current producing due to electromagnetic induction or electrostatic induction effect.
2, the function (see figure 5) of high speed grounding switch HSGS, in the time of circuit single phase ground fault fault, produces one time electric arc; Fault phase two ends circuit breaker trip, relaying protection action first disconnects CB
2fault phase, the relaying protection of circuit offside is action simultaneously also, tripping fault phase switch, an arc extinction, dives and produces for electric arc (secondary arc); The automatics CB that closes
1fault phase (HSGS ground connection), dive for arc extinction; Automatics tripping CB
1fault phase (HSGS opens); The reclosing device action CB that closes
2fault phase, circuit breaker overlaps.Circuit recovers normal condition.
Dual-breaker DCB type high-voltage combined electrical apparatus provided by the present invention can arrange the dual protective device of real meaning, and CT is separately positioned on to DS
2to (as shown in Figure 4) between main bus bar; in the time of a side normal operation of circuit breaker, can disconnect opposite side bus isolating switch, this side circuit breaker is carried out to transmission operation; can, in the situation that not affecting the normal transmission of electricity of circuit, carry out linkage test to relaying protection and switch like this.
As shown in Figure 6, in dual-breaker DCB type high-voltage combined electrical apparatus provided by the present invention, any operation of switching bus is all used circuit breaker, avoids the problem of switching current and changing voltage, is specially:
(1) outlet is hung over to (all switches are in closure state) on two buses simultaneously, in the time that a certain road bus breaks down, by bus protection, all switches on fault bus are excised, and can not cause any outlet line outage.
(2) in electrical network, use the transformer station of DCB type combined electrical apparatus; bus-tie circuit breaker should be in off-state; power supply and load outlet switch are selectively hung on two buses, the configuration of relaying protection and automatics is simplified more, move more reliable.In this case in the time that a certain road bus occurs to have a power failure, on its bus with load can automatically switch on another road bus by switching device shifter itself, this automatic switching procedure can complete within several seconds zero point.
(3) the present invention can change power system operating mode by operating breaker at any time, and does not use isolating switch to operate, and has avoided owing to using isolating switch that the possibility of misoperation occurs, thereby has reduced power outage.
Above are only preferred embodiment of the present invention, certainly, can also have other execution mode with further exploration according to actual needs.But, should be clear and definite, based on similar the conversion above-mentioned or execution mode with same idea that other is not explained out, all should be encompassed among the protection range of the claims in the present invention.