Current, the operation of high pressure unit switch electrical equipment and even ultra high voltage unit switch electrical equipment and three difficult problems making existence.
At first, be about the little current capacity of septal line trackside isolating switch folding (capacitance current, inductive current), how to satisfy 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 the 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 according to the correlation test that existing standard is carried out, do not satisfy actual needs, or induced voltage is lower than actual demand, or induced current to be less than actual demand.One of reason that has problems is: the circuit of parallel lines on same tower with voltage only considered in standard formulation, and in fact more is the circuit of the different voltages of parallel lines on same tower.The circuit of this parallel lines on same tower, induced voltage, electric current that the isolating switch of low-voltage grade, earthed switch need suit, all than high-tension height, exactly different with current standard.
Secondly, be 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 the IEC standard, and stipulate in the 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, because bus connection switch might be because fault but not complete operation, therefore to the calculating and the imagination of bus changing voltage, the accident that can not prevent the bus conversion operations to take place.
Last problem is high speed grounding switch HSGS(High Speed Grounding Switches) manufacturing and use.The fault of ultra-high-tension power transmission line is single phase ground fault more than 90%, and has 80% to be " instantaneity " fault in the single phase ground fault approximately.In China, 330kV, 500kV circuit adopt the 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 power supply arc of fault point put out certainly.On-the-spot operation shows that with test the amplitude of secondary arc current and recovery voltage is to dive the power supply arc from two decisive factors of going out under the stable state; The method of extinguishing the power supply arc of diving mainly contains the high voltage reactor neutral point and connects little reactance and use HSGS (High Speed Grounding Switches) two kinds.The former at home and abroad is used widely, and the latter has obtained using in the UHV system that Japan has built up.Shorter for those circuits, need not connect reactor restriction power-frequency overvoltage, though or have reactor to be connected on the bus, be not the situation of establishing at certain bar circuit, can't use the former method and can only adopt the latter.HSGS is actual to be exactly a high-speed switch that is started by relaying protection, and still, existing earthing isolator all can not satisfy above-mentioned functions.
The utility model content
At the drawback of prior art, the purpose of this utility model is to propose the outdoor gas-insulated metal-enclosed formula high pressure combined electrical apparatus of a kind of double-break type (DCB) type.
The double-break device DCB type high pressure combined electrical apparatus that the utility model 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 installed in two circuit breakers in the tank body, and be provided with insulated support between two arc control device of two circuit breakers, described two arc control device are middle with tapped two fracture type arc control device, be respectively arranged with the first, second, third and the 4th three-station isolating/grounding switch above two circuit breakers that both sides and symmetry are installed about tap, wherein first, second is connected sleeve pipe or the cable tank of installing current transformer with the 3rd three-station isolating/grounding switch, and the 4th three-station isolating/grounding switch connects voltage transformer;
Described tank body and central console are packed on the support, and described central console connects two circuit breakers of control, quadruplet tri-station isolating switch respectively;
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 the described arc control device.
Further, described insulating gas is SF
Further, described two circuit breakers have spring operating mechanism separately.
Further, two shared tank bodies of arc control device.
Further, two circuit breakers are connected at the insulated support place of fixed contact.
Further, four groups of tri-station isolating switchs coexist in the tank body.
Further, described sleeve pipe is compound insulating sleeve or porcelain insulating sleeve.
The double-break device DCB type high pressure combined electrical apparatus that the utility model proposes adopts back-to-back two circuit breakers, makes transformer station's design longitudinal size greatly reduce.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 installed in 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 the tank body
6Do interior insulation, adopt SF between arc control device and tank body
6Gas is done interior insulation, and circuit breaker is joined spring operating mechanism, and tri-station isolating switch adopts high-purity SF
6Gas is done 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 utility model strengthen, bus switching current ability (switching current, changing voltage) strengthens, can satisfy the demand of digitlization electric substation, reduce floor space, shorten the set-up time, the reliability and the fail safe of equipment have been improved, and can adapt to most applied environments, cost is lower, is convenient to the standardization manufacturing.
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that embodiment described herein only is used to explain the utility model, rather than be used to limit the utility model.
As shown in Figure 3, in the double-break device DCB type high pressure combined electrical apparatus that the utility model proposes, circuit connecting mode is: the two ends bus is connected with circuit breaker with three-station isolating/grounding switch by current transformer respectively, central console is installed in circuit breaker and three-station isolating/grounding switch bottom, two circuit breaker stationary contacts connect output and draw terminal one time by sleeve pipe or cable tank, and connect a voltage transformer before drawing.
As shown in Figure 1, the double-break device DCB type high pressure combined electrical apparatus that the utility model 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 installed in two circuit breakers in the 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 two fracture type arc control device of band centre tap formula, as shown in Figure 1, arc control device are set to described breaker mechanism and comprise that symmetry is installed in two circuit breakers in the tank body, and be provided with insulated support between two arc control device of two circuit breakers, described two arc control device are middle with tapped two fracture type arc control device, be respectively arranged with first between moving contact that both sides and symmetry are installed about tap and the circuit breaker, second, third and fourth three-station isolating/grounding switch 2, wherein first, second is connected sleeve pipe or cable tank 1, the four three-station isolating/grounding switch of installing current transformer 4 with the 3rd 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 the arc control device and between arc control device and tank body.
The double break shape of the mouth as one speaks formula arc control device of band centre tap formula, this is provided with 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 utility model preferred embodiment, 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, when practical application, two shared tank bodies of arc control device, the shared outlet tri-station isolating switch of two cover circuit breakers, four groups of tri-station isolating switchs coexist in the tank body.
Described sleeve pipe is a compound insulating sleeve, is generally the use silastic material, and under particular surroundings, should disposes porcelain bushing as high height above sea level, extremely frigid zones.
The disclosed double-break device of the utility model DCB type high pressure combined electrical apparatus, the potting breaker structural configuration is adopted in integrally-built design, is convenient to on-the-spot whole Transporting and installation.Circuit breaker uses double break mouth SF
6Arc control device use sulfur hexafluoride gas as insulation, and with the high voltage isolator integrated design, form whole HGIS high pressure combined electrical apparatus.Three-phase is contained on the shared under casing, and every phase can be furnished with spring operating mechanism shared or separately.This high pressure combined electrical apparatus can satisfy the demand of digitlization electric substation, has reduced floor space, has shortened the set-up time, has improved the reliability and the fail safe of equipment.
Specifically, double-break device DCB type high pressure combined electrical apparatus provided by the utility model in fact two circuit breakers is organized isolating switches and is organized the New Combined Switchgear that equipment such as electric currents, voltage transformer are formed more with, as shown in Figure 4, middle one group of sleeve pipe or cable tank are the outlet sleeve pipe, are used to connect the turnover line of transformer station.The sleeve pipe on both sides or cable tank are bus casing or cable termination, are used to connect two groups of buses of transformer station.
When this equipment conduct is subjected to electric switch, be defined as and be subjected to electric operational mode, as shown in Figure 5, DS
2Be in closing position, ES
1Be in "on" position, CB
1Be in stand-by state, to use as high speed grounding switch.
When switch is sent in this equipment conduct, be defined as and send operational mode, as shown in Figure 6, DS1 and DS
2All be in closing position, CB
2One of be in "on" position, another group is in stand-by state.
In the practical application, parallel lines on same tower or the parallel transmission line of long distance are more and more, and 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 utility model to solve this problem very ideally, the 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 to disconnect earlier CB respectively
2, CB again closes
1, make circuit be in ground state, at this moment circuit just can carry out normal repair and maintenance work.Its advantage is in operating process, in case when circuit had electricity, the short circuit current that can effectively utilize line side CT to measure started relaying protection tripping circuit breaker, to reduce the impact of misoperation to electrical network.Under normal circumstances, close by earthed switch (FES) and close between dead line and the adjacent alive circuit inductive grounding electric current that produces owing to electromagnetic induction or electrostatic induction effect.
2, the function (see figure 5) of high speed grounding switch HSGS when circuit single phase ground fault fault, produces one time electric arc; Fault phase two ends circuit breaker trip, the relaying protection action disconnects CB earlier
2Fault phase, the relaying protection of circuit offside be action simultaneously also, tripping fault phase switch, and an arc extinction, the power supply arc (secondary arc) of diving produces; The automatics CB that closes
1Fault phase (HSGS ground connection), the power supply expulsion of arc of diving goes out; Automatics tripping CB
1Fault phase (HSGS opens); The reclosing device action CB that closes
2The fault phase, circuit breaker overlaps.Circuit recovers normal condition.
Double-break device DCB type high pressure combined electrical apparatus provided by the utility model can be provided with the dualization protective device of real meaning, and CT is separately positioned on DS
2To (seeing shown in Figure 4) between the main bus bar; when a side normal operation of circuit breaker, can disconnect the opposite side bus isolating switch, this side circuit breaker is carried out the transmission operation; can under the situation that does not influence the normal transmission of electricity of circuit, carry out linkage test like this to relaying protection and switch.
As shown in Figure 6, in the double-break device DCB type high pressure combined electrical apparatus provided by the utility model, circuit breaker is all used in any operation of switching bus, avoids the problem of switching current and changing voltage, is specially:
(1) outlet is hung over (all switches are in closure state) on two buses simultaneously, when a certain road bus breaks down, by bus protection all switches on the fault bus are excised, and can not cause any outlet line outage.
(2) transformer station of use DCB type combined electrical apparatus in the electrical network; bus-tie circuit breaker should be in off-state; the power supply and the wiretap of loading out selectively are hung on two buses, make the configuration of relaying protection and automatics simplify more, move more reliable.In this case when a certain road bus take place to have a power failure, on its bus with load can automatically switch on another road bus by the switching device shifter of itself, this automatic switching procedure can be finished in several seconds zero point.
(3) the utility model can change power system operating mode by operating breaker at any time, and does not use isolating switch to operate, and has avoided taking place owing to the use isolating switch possibility of misoperation, thereby reduces power outage.
Above-mentioned only is preferred embodiment of the present utility model, certainly, with further exploration other execution mode can also be arranged according to actual needs.But, should be clear and definite be that the conversion based on similar execution mode with same idea above-mentioned or that other is not explained out all should be encompassed among the protection range of the utility model claim.