CN103715682A - Capacitive charge release system of buffer arc extinction cabinet - Google Patents
Capacitive charge release system of buffer arc extinction cabinet Download PDFInfo
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- CN103715682A CN103715682A CN201310493516.XA CN201310493516A CN103715682A CN 103715682 A CN103715682 A CN 103715682A CN 201310493516 A CN201310493516 A CN 201310493516A CN 103715682 A CN103715682 A CN 103715682A
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Abstract
The invention discloses a capacitive charge release system of a buffer arc extinction cabinet. Protection end lines A1, B1 and C1 are led out from three phases of lines A, B and C from a protected system. The protection end lines A1, B1 and C1 are connected with an overvoltage protector. The protection end lines A1, B1 and C1, which are located in front of the overvoltage protector, are successively connected with a high voltage fuse, a voltage transformer and a controller. The protection end lines A1, B1 and C1, which are located in front of the high voltage fuse, are successively connected with a current limiting fuse and an energy absorption plate group, wherein the current limiting fuse and the energy absorption plate group are connected in parallel, and the other end is respectively connected with vacuum contactors JZa, JZb and JZc. The vacuum contactors JZa, JZb and JZc are grounded together through a three-phase shared reactor. The control ends of the vacuum contactors JZa, JZb and JZc access a controller KWX through leads. According to the invention, the reactor is used to damp capacitive current released by a circuit to the ground after a fault phase vacuum contactor is turned on for the ground; the speed of the fault phase potential dropping to the ground potential is delayed; and another overvoltage wave oscillation which appears on a non fault phase is eliminated.
Description
Technical field
The present invention relates generally to power domain, relates in particular to a kind of capacitance charge delivery system that cushions arc extinction cabinet.
Background technology
Single-phase earthing is the major failure form in electric power system, accounts for the more than 60% of sum.During isolated neutral system generation single-phase earthing, the overwhelming majority is with electrical arc ground connection, and what flow through earth point is capacity current.35kV and following circuit overall length are no more than 100km, and its earth current will be no more than 10A.This electric arc is not enough to smooth combustion, but forms intermittent electric arc off and on, and this,, by causing the vibration in system inductance capacitance loop, causes arcing ground over-voltage.
Arc extinction cabinet is in current electric system of neutral-piont earth free, to eliminate the fruitful protection equipment of arc grounding overvoltage, not gentle while hardly realizing its extinguishing arc, causes between that Shun of extinguishing arc again objectively for arc grounding overvoltage has been stirred up trouble once.That is to say that arc extinction cabinet is being the system elimination superpotential while of arc grounding, the insulation of electrical installation in system also will bear once more serious strike again.
Summary of the invention
In order to make up the deficiency of prior art, the invention provides a kind of capacitance charge delivery system that cushions arc extinction cabinet.
The technical solution used in the present invention is:
The capacitance charge delivery system of buffering arc extinction cabinet, it is characterized in that: respectively from the triple line A of protected system, B, the protection end line A1 drawing on C, B1, C1, this protection end line A1, B1, on C1, be connected to overvoltage protector DCB, the lower end ground connection of overvoltage protector DCB, be positioned at the protection end line A1 in overvoltage protector DCB the place ahead, B1, on C1, be connected to successively high-tension fuse D2, voltage transformer pt and controller KWX, be positioned at the protection end line A1 in high-tension fuse D2 the place ahead, B1, on C1, be connected to successively current limiting fuse RD1 parallel with one another and energy-absorbing sheet group FR, current limiting fuse RD1 parallel with one another is connected respectively vacuum contactor JZa with the energy-absorbing sheet group FR other end, JZb, JZc, vacuum contactor JZa, JZb, JZc shares reactor L ground connection through a three-phase more jointly, vacuum contactor JZa, JZb, the control end of JZc accesses described controller KWX by wire.
The capacitance charge delivery system of described buffering arc extinction cabinet, is characterized in that: described three-phase shares the inductance value of reactor L in the milihenry category of units.
Controller KWX is input, control appliance, is the core component of this device.
Vacuum contactor JZa, JZb, JZc must be take the output signal of controller KWX and could effectively be worked as switch controlling signal source, complete parameter preset protection and service requirement.
Below three-phase vacuum contactor in arc extinction cabinet, through installing a three-phase additional, share reactor L ground connection, in the time of can be by arc grounding, normal phase overvoltage to earth be down to line voltage reposefully, makes the arc performance of arc extinction cabinet more perfect.
Advantage of the present invention is:
The reactor that utilization of the present invention is installed additional, damping the fault phase vacuum contactor capacity current that line-to-ground discharges after conducting over the ground, delayed fault phase current potential and dropped to earthy speed, eliminated and on healthy phases, occurred another over-voltage waveform vibration.
Simultaneously, another bright spot of the present invention is the action mutually of any one in three-phase vacuum contactor in cabinet, all through a public reactor, only adopt a reactor to take into account damping three-phase contactor earth current, alleviated the interior element of cabinet crowded, save cost of investment, reduced cabinet overall weight.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is overvoltage forming process schematic diagram.
Fig. 3 is the extinguishing arc principle schematic of arc extinction cabinet in system.
Fig. 4 is the circuit theory schematic diagram adding between vacuum contactor and ground after a reactor.
Fig. 5 is the capacitance resistance discharge loop schematic diagram on fault phase.
Fig. 6 is the capacitance resistance discharge curve schematic diagram on fault phase.
Fig. 7 is electric capacity, inductance, the conductive discharge loop schematic diagram on fault phase.
Fig. 8 is electric capacity, inductance, the conductive discharge curve synoptic diagram on fault phase.
Fig. 9 is reactor installation site schematic diagram.
Embodiment
As shown in Figure 1, the capacitance charge delivery system of buffering arc extinction cabinet, respectively from the triple line A of protected system, B, the protection end line A1 drawing on C, B1, C1, this protection end line A1, B1, on C1, be connected to overvoltage protector DCB, the lower end ground connection of overvoltage protector DCB, be positioned at the protection end line A1 in overvoltage protector DCB the place ahead, B1, on C1, be connected to successively high-tension fuse D2, voltage transformer pt and controller KWX, be positioned at the protection end line A1 in high-tension fuse D2 the place ahead, B1, on C1, be connected to successively current limiting fuse RD1 parallel with one another and energy-absorbing sheet group FR, current limiting fuse RD1 parallel with one another is connected respectively vacuum contactor JZa with the energy-absorbing sheet group FR other end, JZb, JZc, vacuum contactor JZa, JZb, JZc shares reactor L ground connection through a three-phase more jointly, vacuum contactor JZa, JZb, the control end of JZc accesses described controller KWX by wire.
Three-phase shares the inductance value of reactor L in the milihenry category of units.
Buffering necessity is:
Overvoltage forming process as shown in Figure 2.After the arcing of fault point, moment represents with t1+, and A phase line mutual-ground capacitor electric charge leaks into ground through electric arc, and its voltage die is zero, and non-fault B, C two-phase direct-to-ground capacitance are by the induction charging of power supply, and voltage to earth becomes new voltage-1.5Uxg from original-0.5Uxg.This process is higher-order of oscillation process, and in oscillatory process, the Overvoltage Amplitude occurring on the line of B, C two-phase is-2.5Uxg.
Arc current continues half period, because arc current is that capacity current and supply voltage eA differ 90 °, therefore in t2 current over-zero blow-out constantly.B, C be the upper electric charge mean allocation between three-phase ground capacitance that stores mutually, makes three-phase conducting wire produce over the ground offset voltage Uxg, acts on like this voltage on three-phase conducting wire direct-to-ground capacitance and be three-phase mains voltage this offset voltage that superposes.
If after half period, during t=t3, uA reaches 2Uxg again, arc reignition.Before arcing, the voltage to earth of moment B, C phase is 0.5Uxg, and after arcing, moment becomes the line voltage-1.5Uxg to A phase, so be-3.5Uxg of the Overvoltage Amplitude in oscillatory process.
In order to administer the overvoltage of above form, in this system, arc extinction cabinet has been installed, the extinguishing arc principle of arc extinction cabinet in system is as shown in Figure 3.When overvoltage reaches arc extinction cabinet internal controller set point, cabinet internal controller is assigned instruction, allows cabinet internal fault phase vacuum contactor K drop into, the earth current of fault point D is transferred to self, the arc grounding of earth point D has disappeared, and arc extinction cabinet has completed extinguishing arc task, and this situation is incontrovertible.
Yet, there is mutually arc grounding in certain from electric power system, on healthy phases, superpotential effective value has reached the numerical value that detecting instrument (controller) sends action command, controller sends and requires fault phase vacuum contactor reclosing command, closed to this phase vacuum contactor, lasted existing a lot of power frequency cycle.Stood insulation of electrical installation in the system after the overvoltage wave impact that a lot of is difficult to bear, possible its performance is in the state of cannot withstand a single blow, and they thirst for overvoltage and disappear immediately.But, common arc extinction cabinet finally can be eliminated by all means arc light and just finish, wouldn't know when the violent ground connection of fault phase vacuum contactor, this earth resistance is much smaller than the natural grounding resistance of accident point, this fault phase over the ground release current, suddenly in natural grounding in the past, causes that the Overvoltage Amplitude that vibrates on healthy phases is higher than natural grounding arc overvoltage amplitude in the past.This kind of situation be equal to Fig. 2 in the superpotential concussion waveform of arc grounding on time shaft, extended again a cycle, on healthy phases, the concussion Waveform reproduction of the nearly 3.5 times of phase voltages of arc grounding Overvoltage Amplitude is once.That is to say that arc extinction cabinet is being the system elimination superpotential while of arc grounding, the insulation of electrical installation in system also will bear once more serious strike again.For fear of the wound of bringing to insulation when calming down arc light, my company determines to install one buffer element-reactor in arc extinction cabinet.
Impact mitigation measure is:
1, device reactor in arc extinction cabinet
The superpotential peak value of arc grounding reaches because of " vibration ".Should " vibration " through electric arc, suddenly leak into ground by fault phase line mutual-ground capacitor electric charge, its voltage die is zero, and healthy phases voltage to earth is by the higher-order of oscillation that tosses and cause.
For slowing down vacuum contact in ground connection moment speed of release current over the ground, we add a reactor between vacuum contactor and ground, and circuit theory as shown in Figure 4.
2, cushioning principle
When there is mutually arc grounding overvoltage in electric power system, after controller in arc extinction cabinet detects, immediate command fault phase vacuum contactor is closed, and the capacitance charge on fault phase discharges over the ground by earth resistance, form capacitance resistance discharge loop, as shown in Figure 5.Discharge curve as shown in Figure 6.
As seen from Figure 6, discharge current curves starting point is maximum, and earth resistance is conventionally very little, therefore transient process is very fast, change curve steepness is very large, this transient process can be considered as to sudden change.Because the voltage jump of fault phase is zero, be directed at healthy phases voltage to earth manganese liter, on healthy phases circuit, capacitance charge was supplemented by power supply moment, because supplementing too urgency, caused vibration overvoltage.This kind of situation is equal to the superpotential concussion waveform of arc grounding has extended again a cycle on time shaft.Because cabinet earth resistance is less than natural grounding resistance, therefore its oscillation amplitude is greater than nature oscillation amplitude, on healthy phases, arc grounding Overvoltage Amplitude likely approaches 3.5 times of phase voltages.That is to say that arc extinction cabinet is being the system elimination superpotential while of arc grounding, the insulation of electrical installation in system also will be accepted a serious blow again.Often, with regard to this, perhaps can give catastrophic strike of some insulation of electrical installation.
If arc extinction cabinet is in-built reactor, as shown in Figure 4.When system generation arc grounding overvoltage, the action of fault phase vacuum contactor, owing to having individual reactor string therein, the capacitance charge on fault phase discharges over the ground by reactor, earth resistance, forms electric capacity, inductance, conductive discharge loop, as shown in Figure 7.Discharge curve as shown in Figure 8.
Situation is taken on a new look completely thus, as seen from Figure 8, and after circuit is connected, capacitor C is discharged at once, and discharge current curves starting point is zero, i.e. so-called " inductance does not allow current break ", so it is zero that uc also can not fall sharply, during fault phase ground connection, its above earth potential decay is cushioned.Because " soft landing " of fault phase ground connection, make healthy phases current potential lift 3 times of phase voltages to √ on steadily, healthy phases waveform reforming phenomena has not had.Both eliminate in time the arc light of earth point, and can not occur again an even more serious overvoltage Sasser at healthy phases again.
3, the selection of reactor installation site
Reactor installation site as shown in Figure 9, by ground connection again after a reactor of three-phase vacuum contactor earth terminal serial connection in parallel.Like this, the action mutually of any one in cabinet in three-phase vacuum contactor, all through a shared reactor, only adopt a reactor can take into account damping three-phase vacuum contactor earth current, alleviate the interior element of cabinet crowded, saved cost of investment, reduced cabinet overall weight.
Claims (2)
1. a capacitance charge delivery system that cushions arc extinction cabinet, it is characterized in that: respectively from the triple line A of protected system, B, the protection end line A1 drawing on C, B1, C1, this protection end line A1, B1, on C1, be connected to overvoltage protector DCB, the lower end ground connection of overvoltage protector DCB, be positioned at the protection end line A1 in overvoltage protector DCB the place ahead, B1, on C1, be connected to successively high-tension fuse D2, voltage transformer pt and controller KWX, be positioned at the protection end line A1 in high-tension fuse D2 the place ahead, B1, on C1, be connected to successively current limiting fuse RD1 parallel with one another and energy-absorbing sheet group FR, current limiting fuse RD1 parallel with one another is connected respectively vacuum contactor JZa with the energy-absorbing sheet group FR other end, JZb, JZc, vacuum contactor JZa, JZb, JZc shares reactor L ground connection through a three-phase more jointly, vacuum contactor JZa, JZb, the control end of JZc accesses described controller KWX by wire.
2. the capacitance charge delivery system of buffering arc extinction cabinet according to claim 1, is characterized in that: described three-phase shares the inductance value of reactor L in the milihenry category of units.
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| CN201310493516.XA CN103715682A (en) | 2013-10-18 | 2013-10-18 | Capacitive charge release system of buffer arc extinction cabinet |
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| CN201310493516.XA CN103715682A (en) | 2013-10-18 | 2013-10-18 | Capacitive charge release system of buffer arc extinction cabinet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105140904A (en) * | 2014-06-05 | 2015-12-09 | 国网山西省电力公司电力科学研究院 | Power arc extinguishing system |
| CN105703378A (en) * | 2016-03-23 | 2016-06-22 | 广州开能电气实业有限公司 | Reactor switching module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105140904A (en) * | 2014-06-05 | 2015-12-09 | 国网山西省电力公司电力科学研究院 | Power arc extinguishing system |
| CN105703378A (en) * | 2016-03-23 | 2016-06-22 | 广州开能电气实业有限公司 | Reactor switching module |
| CN105703378B (en) * | 2016-03-23 | 2019-03-26 | 广州开能电气实业有限公司 | A kind of reactor switching module |
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Application publication date: 20140409 |