CN103915809A - Alternating-current power-supply-uninterrupted ice melting method and device for multi-split wires - Google Patents
Alternating-current power-supply-uninterrupted ice melting method and device for multi-split wires Download PDFInfo
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Abstract
The invention discloses an alternating-current power-supply-uninterrupted ice melting method for multi-split wires. At least one ice melting converter is connected to each phase of line in the middle of a line ice melting section in series, each ice melting converter is provided with at least two sets of primary lateral coils and at least one set of secondary lateral coil, the two sets of primary lateral coils are connected into the middle of one phase of line to enable the phase of currents to flow through the two sets of primary lateral coils in two branches and generate secondary currents in the secondary lateral coils in an induced mode, the alternating currents output by the secondary lateral coils through tapping points or load regulators are converted into direct currents through a rectification loop, then the direct currents are loaded onto an ice melting loop formed by the multi-split wires of the phase of line to form ice melting loop currents, the heating amount of the ice melting loop currents and the heating amount of load currents of the lines are controlled to be overlaid, and the effect of line protection or ice melting is achieved. An ice melting device manufactured through the method is hung in the middles of three phases of high-voltage lines in a phase-split mode and runs with the high-voltage lines in an equal potential mode. The device is low in insulation requirement, small in size and low in manufacturing cost, and cannot cause line-to-ground faults and phase-to-phase faults.
Description
Technical field
The present invention relates to a kind of de-icing method and electric device thereof of power circuit, particularly a kind of method and device thereof for ice-melt that the alternating current circuit of multiple fission conductor is not had a power failure.
Background technology
Power circuit icing problem is the major issue that countries in the world are generally concerned about.
Retrieve the de-icing technology of international and domestic power circuit, conventional two classes that are divided into: one is to adopt artificial deicing or mechanical deicing, and de-icing work amount is large, and interruption duration is long, and loss of outage is large, and mechanical deicing's method does not have maturation.Equations of The Second Kind is thermal ice-melting, and thermal ice-melting is divided into again power failure ice-melt and does not have a power failure ice-melt two classes.
The common method of power failure ice-melt has following two kinds:
1, ac short circuit up-flow ice-melt:
Want DC ice-melting (as 110KV or 220KV circuit) by 2～3 and be connected in series by switch operation, tandem link end man-made short-circuit, first section directly adds AC power (as 10KV or 35KV) and carries out the ice-melt of short circuit up-flow.This is the most frequently used method in the ice-melt practice of all provinces in south, and its advantage is not need special equipment, and production scene is very practical.It is non-adjustable that shortcoming is that its short circuit applies the voltage of power supply, when switching power supply, impacts larger to electrical network.Will calculate the number of series circuit in advance, the selected difficulty of series circuit also needs protection definite value and protection investing method to adjust temporarily.In relevant several transformer stations, all to vacate the serial connection of a bus for DC ice-melting, make power system operating mode more weak.The switch operation time is long, is difficult to tackle the ice-melt requirement of many circuits while simultaneously there is icing.This method had both consumed meritorious in short circuit up-flow process, consumed again a large amount of idlely, and reactive power consumption amount is approximately 4 times of meritorious consumption, very large on line voltage impact, so that cannot use at 500KV and Above Transmission Lines.
2, utilize the idle static compensation device of SVC as deicing device, circuit carried out to direct-current short circuit ice-melt:
SVC is idle static compensation device is after the rare ice damage that occurs of 2008 Nian Chun China as deicing device, Hunan Province's DianKeYuan development, when after circuit generation icing, by line outage, line end man-made short-circuit, first in the two-phase of first section, add the direct voltage through the idle static compensation device rectification output of SVC type, the two-phase of circuit is carried out to direct-current short circuit ice-melt, after finishing, again third phase is carried out to ice-melt.Its advantage is that the direct voltage of device output is adjustable, can be adapted to the circuit of any length and electric pressure.Ice-melt compares that consumption systems is not idle with ac short circuit.When icing, as ice-melting device, as idle static compensation arrangement, utilization rate of equipment and installations is high at ordinary times.Shortcoming is once to melt two-phase, and the ice-melt time is long, switch operation and that short-circuit line workload is manually set is large, and will have a power failure and carry out.
Compare from the method for above two kinds of conventional power failure ice-melts, can find, DC ice melting only need provide an active current that produces ohm heat, without reactive current is provided, therefore the required installed capacity of DC ice melting is more much smaller than exchanging ice-melt.
The method of ice-melt of not having a power failure mainly contains following 3 classes:
1, adjustment System trend, strengthens the method that DC ice-melting is loaded:
Excise a circuit by scheduling, the load of two circuits is transferred to a circuit and make its ice-melt, or make whole load currents of heavy ice line end transformer station all pass through a circuit of heavy icing area.The method may be destroyed system stability in using, and actual effect is still needed and further studied.Theoretic discussion is at present more, seldom has the case of practical application.
2, begin the seventies in last century, Baoji power supply administration is on the circuit of 110KV double bundle conductor, the conductor spacer that the double bundle conductor of the part of path of icing easily occurs is throughout the year replaced by insulation gap rod, adopt metal conductor spacer short circuit sub-conductor to form ice-melt loop at ice-melt section two ends, portion builds ice-melt station in the line, from line ice-melting section middle part, T connects transformer as ice-melt power supply, step-down, isolation, after rectification, in the ice-melt loop that adds every phase double bundle conductor to form, form ice-melt circulation, control the own load current caloric value stack of ice-melt circulation and circuit and realize the ice-melt that do not have a power failure.This is current unique de-icing method that do not have a power failure in use, is also a special case in ice-melt practice, because 110kv circuit adopts solid conductor mostly, adopts the few of two divisions.Owing to using on 110KV circuit, voltage is low, and method is simple.For voltage levels more, as superhigh pressure and extra high voltage line middle part T connect ice-melt transformer, transformer requires highly with phase insulation over the ground, and volume and cost improve thereupon, are also very easy to connect transformer by T and cause line-to-ground and phase-to phase fault.
3, Chinese patent application " ice-melt that do not have a power failure hold concurrently SVG type reactive static plerosis locking device and using method thereof " (CN201110410482.4 and CN201210545515.0), adopt respectively UPFC and SSSC technology, trend adjustment by a certain the circuit in parallel circuit or loop network makes it reach ice melting current, simultaneously do not needing ice-melt season, changeable is that the idle static compensation device of SVG type uses, one two kinds of covering devices function, utilization rate of equipment and installations improves greatly.While being used for the ice-melt of 110kv and following parallel circuit or loop grid, its required installed capacity is consistent with the capacity that the required reactive static of transformer station of its electric pressure is mended.But when the method is used for the ice-melt of 220kv and Above Transmission Lines, required installed capacity increases with the rising of line voltage distribution, and economy is not good.
Based on above analysis, the problem of ice-melt of power circuit can the not being had a power failure research respectively that is divided three classes: the one, the ice-melt problem of the parallel circuit of solid conductor or loop network circuit, be generally the transmission line of 10KV, 35KV, 110KV, adopt the method for above-mentioned Chinese patent application (CN201110410482.4 and CN201210545515.0) feasible; The 2nd, to the radial supply line of customer power supply, cannot form looped network and be the ice-melt problem of solid conductor circuit, be generally 0.4KV, 10KV and 35KV distribution line, also there is no the ripe ice-melt scheme that do not have a power failure at present; The 3rd, the ice-melt problem that do not have a power failure of multiple fission conductor, is mainly 220KV and above high pressure, superhigh pressure, UHV transmission line.
Therefore, the ice-melt problem that do not have a power failure of solution multiple fission conductor is the problem that applicant studies.
Summary of the invention
For the do not have a power failure technical problem of ice-melt of multiple fission conductor, the object of the invention is to, a kind of alternating current circuit for multiple fission conductor do not have a power failure de-icing method and device thereof are provided.
In order to realize above-mentioned task, the present invention takes following technical scheme to be achieved:
A kind of de-icing method that do not have a power failure of the alternating current circuit for multiple fission conductor, it is characterized in that, the method at least one ice-melt current transformer of all connecting on each phase circuit at line ice-melting section middle part, every ice-melt current transformer at least arranges two groups of first siding rings and at least one group of second siding ring, two groups of first siding rings seal in a phase circuit middle part makes this phase current divide two-way to flow through two groups of first siding rings the secondary current of inducting in second siding ring, second siding ring is through tap or have the adjuster of carrying output, the alternating current of its output loads on the ice-melt loop formation ice-melt circulation that this many oidiospores of phase circuit wire forms after commutating circuit becomes direct current, control after the caloric value stack of ice-melt circulation and the load current of circuit own, reach and protect line effect or ice-melt effect.
Above-mentioned ice-melt current transformer, jointly be wound on and samely form on iron core-closed by least two group first siding rings and at least one group of second siding ring, mutually insulated between two groups of primary windings wherein and second siding ring, and contact by the iron core-closed magnetic of setting up, in the time that alternating current flows through two groups of first siding rings in the same way, connect second siding ring at the equidirectional magnetic flux of iron core-closed middle generation key, at the second siding ring secondary current of inducting, second siding ring outlet arranges tap or has the adjuster of carrying, to regulate the size of second siding ring output current, second siding ring outlet can move by bringing onto load, or short circuit operation is in Light Condition, but can not open circuit operation, and:
When the second siding ring of ice-melt current transformer is during through many taps output, by the selection of diverter switch or electronic switch, make many taps have a road at least in conducting state, become direct current to load on ice-melt loop through commutating circuit the alternating current of output;
Or, when the second siding ring of ice-melt current transformer is in the time having the adjuster of carrying output, the alternating current of output is loaded on to ice-melt loop after commutating circuit becomes direct current;
Or in the time that an ice-melt current transformer has multiple second siding ring, multiple second siding rings can be exported after serial or parallel connection.
The deicing device that do not have a power failure of the alternating current circuit of multiple fission conductor prepared by employing said method, is characterized in that, on each phase circuit at line ice-melting section middle part, by least one ice-melt current transformer, at least one rectifier bridge, a set of controller and power unit, two groups of by-pass switch compositions, wherein, ice-melt current transformer have at least two groups of first siding rings and at least one group of second siding ring be wound on same iron core-closed on, at every phase line ice-melting section middle part, bundle conductor bundle is divided to two groups of first siding rings that seal in respectively ice-melt current transformer after two groups of parallel connections, make every phase line current divide two-way to flow through two groups of primary windings, for 2, 4, 6, 8, 10, the bundle conductor bundle (L) of even number, two groups of first siding rings seal in respectively 1, 2, 3, 4, 5 oidiospore bundle conductors, for 3, 5, 7, 9, 11, odd number bundle conductor, first group of first siding ring (W1) seals in 2, 3, 4, 5, 6 oidiospore bundle conductors, second group of first siding ring seals in 1, 2, 3, 4, 5 oidiospore bundle conductors, two groups of by-pass switches are connected in parallel on respectively two first siding ring two ends of ice-melt current transformer, ice-melt current transformer second siding ring is through tap or have the adjuster of carrying output, and be electrically connected with the AC of rectifier bridge, the DC side of rectifier bridge is electrically connected with the ice-melt loop of multiple fission conductor composition, the operation of controller and the whole device of power unit control.
Or above-mentioned power failure in deicing device, when two groups of by-pass switches at two first siding ring two ends of current transformer save, arranges one group of by-pass switch in the outlet of secondary coil.
Alternating current circuit for multiple fission conductor of the present invention do not have a power failure de-icing method and device thereof, the beneficial effect bringing is, the ice-melt current transformer of connecting on the every phase circuit in line ice-melting section middle part, ice melting current is provided, ice-melt current transformer, commutating circuit and control loop thereof and the power supply unit a whole set of ice-melting device that grades can all adopt unsettled layout, with the operation of circuit equipotential, the insulating requirements of device is low, volume is little, cost is low.The whole unsettled layouts of a whole set of ice-melting device are even if ice-melting device breaks down, less on the safe operation impact of circuit.In prior art, the T of portion connects ice-melt transformer as rectifier power source in the line, easily causes line-to-ground and phase-to phase fault.And serial connection ice-melt current transformer and package unit and the operation of circuit equipotential can not produce line-to-ground and phase-to phase fault.Ice-melt current transformer secondary side accesses ice-melt loop after rectification, has brought into play the advantage that DC ice melting timer capacity is low, volume is little, cost is low.
Brief description of the drawings
Fig. 1 is the single-phase elementary diagram of double bundle conductor deicing device.
Fig. 2 is the fundamental diagram of ice-melt current transformer.
Fig. 3 is the deicing device wiring block diagram of conductors on quad bundled circuit.
Fig. 4 is the deicing device wiring block diagram of five bundle conductor circuits
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment
Multiple fission conductor, the bundle conductor that each phase conductor that means circuit is made up of at least 2 and above sub-conductor, arranges fixing with conductor spacer between sub-conductor bundle.Generally can there be several split forms such as 2,3,4,5,6,7,8,9,10,11, in practical engineering application, extremely indivedual 110KV transmission lines and most of 220KV, 330KV transmission line adopt two divisions, 500KV circuit adopts 4 divisions mostly, 750KV adopts 6 divisions, and 1000KV adopts 8 divisions.Be mostly even number division, adopt the wire of odd number division number comparatively rare.
The ice-melt section of circuit, can be the total length of a circuit, also can be according to practical operation situation, and one section of circuit that leap mountain area, selection circuit middle part, air port etc. are easy to icing occurs is as ice-melt section.
The ice-melt loop of oidiospore wire composition, mean the conductor spacer of many oidiospores of circuit wire ice-melt section is adopted to insulation gap rod, make to keep insulation between many oidiospores wire, adopt metal conductor spacer by the loop checking installation of oidiospore wire electrical connection composition at the two ends of line ice-melting section.When using whole piece circuit as ice-melt section, on whole piece circuit, all adopt insulation gap rod, rely on the intrinsic electrical connection (generally bundle conductor being connected as a single entity on the terminals of line outlet isolation switch) of circuit both sides to form ice-melt loop.
According to technical scheme of the present invention, the de-icing method that do not have a power failure of the alternating current circuit of multiple fission conductor, the method at least one ice-melt current transformer of all connecting on each phase circuit at line ice-melting section middle part, every ice-melt current transformer at least arranges two groups of first siding rings and at least one group of second siding ring, two groups of first siding rings seal in a phase circuit middle part makes this phase current divide two-way to flow through two groups of first siding rings the secondary current of inducting in second siding ring, second siding ring is through tap or have the adjuster of carrying output, the alternating current of its output loads on the ice-melt loop formation ice-melt circulation that this many oidiospores of phase circuit wire forms after commutating circuit becomes direct current, control after the caloric value stack of ice-melt circulation and the load current of circuit own, reach and protect line effect or ice-melt effect.
The deicing device that do not have a power failure of the alternating current circuit of multiple fission conductor prepared by employing said method, on each phase circuit at line ice-melting section middle part, by least one ice-melt current transformer RB, at least one rectifier bridge ZLQ, a set of controller and power unit KZQ, two groups of by-pass switch (P1, P2) composition, wherein, ice-melt current transformer RB has two groups of first siding ring (W1 at least, W2) and at least one group of second siding ring W0 be wound on same iron core-closed above, at every phase line ice-melting section middle part, bundle conductor bundle L is divided to two groups of first siding ring (W1 that seal in respectively ice-melt current transformer RB after two groups of parallel connections, W2), make every phase line current divide two-way to flow through two groups of primary winding (W1, W2), for 2, 4, 6, 8, 10, the bundle conductor bundle L of even number, two groups of first siding ring (W1, W2) seal in respectively 1, 2, 3, 4, 5 oidiospore bundle conductor L, for 3, 5, 7, 9, 11, odd number bundle conductor, first group of first siding ring W1 seals in 2, 3, 4, 5, 6 oidiospore bundle conductor L, second group of first siding ring W2 seals in 1, 2, 3, 4, 5 oidiospore bundle conductor L, two groups of by-pass switch (P1, P2) be connected in parallel on respectively two first siding ring (W1 of ice-melt current transformer RB, W2) two ends, ice-melt current transformer RB second siding ring W0 is through tap or have the adjuster of carrying output, and be electrically connected with the AC of rectifier bridge ZLQ, the DC side of rectifier bridge ZLQ is electrically connected with the ice-melt loop of multiple fission conductor L composition, and controller and power unit KZQ control the operation of whole device.
Fig. 1 is the single-phase schematic diagram of deicing device on double bundle conductor.L1, L2 represents two root wires (other two-phase of circuit does not draw, and principle is identical) for two division circuits mutually.G1, G2 are the metal conductor spacer at the selected ice-melt section of double bundle conductor (part in the middle of circuit) two ends, for short circuit, two bundle conductor L1, L2 form ice-melt loop, in the middle of ice-melt section circuit, all adopt insulation gap rod (not shown in FIG.), if select whole piece circuit all as ice-melt loop, on whole piece circuit, all adopt insulation gap rod, rely on intrinsic electrical connection short circuit L1, the L2 at circuit double bundle conductor L1, L2 two ends to form ice-melt loop.W1, W2 are two first siding rings that ice-melt current transformer RB is serially connected with double bundle conductor ice-melt section middle part, and W0 is with the second siding ring of the ice-melt current transformer RB of 4 taps (concrete tap number can arrange as required).T1～T12 is controllable silicon, D1, D2 is rectifier diode (also can use controllable silicon), T5～T12 and D1, D2 composition chain type rectifier bridge ZLQ, C is flat wave capacitor, rectification output loads on double bundle conductor L1, the middle part of the ice-melt section that L2 forms (is that ice-melt loop resistance in left and right equates part, just can make left and right two-way ice-melt circulation equal and opposite in direction), necessary full angle conducting (conducting in the time of the zero degree angle of flow) when T5～T12 of commutating circuit works, in case secondary coil cutout produces high pressure, in work, only select a road conducting, T5 and T6 in figure, T7 and T8, T9 and T10, T11 and T12Gong tetra-tunnels, can way be set according to the number of tap.S1, T1, T2 and S2, T3, T4 form respectively two groups of by-pass switch P1, P2, for the throwing to ice-melt current transformer RB primary winding W1, W2, cut.Controller and power unit KZQ gather respectively the ice melting current of line current and device by two groups of Current Transmits 1, CT2, its output signal is controlled respectively the operating state of S1, S2, T1～T12, and can receive control instruction far away teletransmission status signal by wireless mode.
In Fig. 1, in the time of S1 in by-pass switch and S2 connection, two groups of first siding ring W1, W2 of ice-melt current transformer RB are by short circuit, and two circuit L1, L2 are led directly to, and a whole set of deicing device is in exit status.In the time will dropping into deicing device, first allow after T1～T4 full angle conducting (pulse-triggered angle is zero), cut-off switch S1 and S2, and then make T1～T4 stop conducting, line current flows through point two-way first siding ring W1 and the W2 of current transformer RB, rectifier bridge can be according to the ice melting current size of the size of line current and wish loading simultaneously, select the different tap outputs of second siding ring W0 by selecting T5～T12 Zhong mono-road full angle conducting, when line current is exported large tap compared with hour making current, when line current is larger, making current is exported little tap, object makes circuit transmission current and the superimposed effect of additional ice melting current reach predefined guarantor's line effect or ice-melt effect.
When the deicing device that do not have a power failure of the alternating current circuit of multiple fission conductor exits, first full angle is opened T1～T4 by first siding ring (W1, W2) short circuit, drop into again switch S 1 and switch S 2 first siding ring of ice-melt current transformer RB (W1, W2) short circuit is straight-through, make afterwards T1～T4 stop conducting, the deicing device that do not have a power failure of the alternating current circuit of multiple fission conductor is deactivated.
Certainly, also can save by-pass switch P1 and P2 in Fig. 1, outlet at ice-melt current transformer RB secondary coil W0 arranges one group of by-pass switch P, when connection, the secondary coil W0 of short circuit ice-melt current transformer makes current transformer RB in no-load running state, when by-pass switch P disconnects, ice-melt current transformer RB works in ice-melt state, below is elaborated at Fig. 4 embodiment.
In the time adopting the deicing device that do not have a power failure of alternating current circuit of above-mentioned multiple fission conductor of the present invention to be applied to other multiple fission conductor, for the even number division circuits such as 2,4,6,8,10, two groups of primary winding W1, W2 of ice-melt current transformer RB can seal in respectively 1,2,3,4,5 root wires, for the odd number division circuits such as 3,5,7,9,11, first group of primary winding W1 can seal in 2,3,4,5,6 root wires, second group of primary winding W2 can seal in 1,2,3,4,5 root wires, is elaborated below in conjunction with other embodiment.
Controller and power unit KZQ are made up of controller and power supply, consider that ice-melting device will be arranged on circuit middle part, area, remote mountains often, and whole power supply and controller need whole unsettled layouts the same as ice-melting device, therefore can being added photovoltaic charging or special current transformer is set by battery pack, power supply charges.Controller part KZQ, by Current Transmit 1, CT2 detection line electric current and ice-melt current transformer RB outlet electric current, controls the operating state of P1, P2 and T1～T12.Controller part is accepted distant place control command teletransmission status signal by wireless communication mode, also can with ice covering monitoring system associated working of the prior art.Controller and power unit KZQ are easy to realize according to prior art, and the present invention does not do discussion emphasis.
The deicing device (ice-melt current transformer RB, bridge rectifier bridge ZLQ, by-pass switch P1 and P2, controller and power supply KZQ) of the alternating current circuit of a whole set of multiple fission conductor on every phase circuit all adopts built on stilts arrangement, the idiostatic operation of package unit and power circuit, device and power circuit are over the ground and the alternate short trouble that can not cause.Even if deicing device breaks down, also can not produce large impact to the operation of a circuit.
Fig. 2 is the fundamental diagram of ice-melt current transformer RB.It is the core of deicing device, ice-melt current transformer RB be actually one special, the current transformer of power transmission type, it is by least two group first siding ring (W1, W2) and at least one group of second siding ring W0 be jointly wound on same iron core-closed upper composition, two groups of primary winding (W1 wherein, W2) mutually insulated and between second siding ring W0, and contact by the iron core-closed magnetic of setting up, when alternating current in the same way flows through two groups of first siding ring (W1, W2) time, connect second siding ring W0 at the equidirectional magnetic flux of iron core-closed middle generation key, at the second siding ring W0 secondary current of inducting, second siding ring W0 outlet arranges tap or has the adjuster of carrying, to regulate the size of second siding ring W0 output current, second siding ring W0 outlet can move by bringing onto load, or short circuit operation is in Light Condition, but can not open circuit operation, and:
When the second siding ring W0 of ice-melt current transformer is during through many taps output, by the selection of diverter switch or electronic switch, make many taps have a road at least in conducting state, become direct current to load on ice-melt loop through commutating circuit ZLQ the alternating current of output;
Or, when the second siding ring W0 of ice-melt current transformer is in the time having the adjuster of carrying output, the alternating current of output is loaded on to ice-melt loop after commutating circuit ZLQ becomes direct current;
Or in the time that an ice-melt current transformer has multiple second siding ring W0, multiple second siding ring W0 can export after serial or parallel connection.
Two groups of first siding rings (W1, W2) in Fig. 2 and one group of second siding ring W0 are wound on iron core-closed going up jointly, and between coil, mutually insulated is set up magnetic contact by iron core.In the time that 1 point of two-way of electric current I of every phase divisural line way wire flows through two groups of first siding rings (W1, W2) of ice-melt current transformer RB, two first siding rings (W1, W2) are at magnetic flux Φ 1 of the superimposed rear formation of magnetic flux in the same way of iron core-closed middle generation, one time magnetic flux key connects second siding ring W0 and in second siding ring, produces secondary current I2, I2 produces secondary magnetic flux Φ 2, first and second magnetic fluxs (Φ 1, Φ 2) opposite direction in iron core.Ice-melt current transformer (RB) is identical with operation of current transformers principle, its secondary side does not allow open circuit, in the time of secondary side open circuit operation, in second siding ring (W0), do not have electric current to produce (I2=0), just do not have secondary magnetic flux (Φ 2=0) and balance each other with a magnetic flux, the safe operation that magnetic flux Φ 1 can make iron core seriously generate heat scaling loss and produce high voltage jeopardize equipment on the second siding ring W0 of open circuit yet.But the second siding ring W0 of ice-melt current transformer RB can short circuit operation (R=0), in the time of second siding ring W0 short circuit, it is the no-load running state of ice-melt current transformer RB, after the magnetic flux Φ 1 that now second siding ring (W1, W2) produces and Φ 2 basic neutralisations, only has a very little magnetizing flux Φ 0, now second siding ring (W0) has electric current I 2 but terminal voltage U2 is 0, power stage is 0, and very little magnetizing flux Φ 0 only maintains magnetic hysteresis eddy current loss in iron core and the copper loss of second siding ring W0.The same with current transformer, in ice-melt current transformer (RB), the size of Φ 0 is determining the size of power delivery, in the time having load in secondary circuit (R>0), the electric current I 2 of second siding ring W0 increases and will slightly reduce (Φ 1=Φ 2+ Φ 0) with load, Φ 0 will increase, the terminal voltage U2 of second siding ring W0 linear rising with the increase of secondary circuit load resistance simultaneously, primary side voltage drop U1 is also by rising and meet I1 × U1=I2 × U2, now, the power output of second siding ring (W0) is I2 × U2 or (I2)
2× R.
Ice-melt current transformer RB is identical with operation of current transformers principle; difference is the watt level difference that will transmit; current transformer is for measuring and protection; its secondary circuit is all designed to little electric current (general 1A～5A); secondary load little (a little Europe of generic zero) is near short circuit operating state; its first siding ring number of turn is less, and the number of turn of second siding ring is a lot, wire diameter is thin, internal resistance is large.And ice-melt current transformer RB secondary circuit need to be designed to large electric current and higher load resistance value, as for 500KV circuit (LGJ-400 × 4), when circuit through-put power is during at 500MW, ice-melt current transformer second siding ring W0 needs the about 1720A of output current just can make circuit reach and protects line states (not freezing).Approximately 2 ohm of the all-in resistances in the ice-melt loop that the every phase sub-conductor of 500KV circuit of every 100km forms, the resistance of secondary coil is little, if will be in circuit through-put power during at 600MW, while having the ice melting current that is equivalent to 800A on every root wire, the power output of ice-melt current transformer RB will reach about 13MW.Therefore bis-output currents of ice-melt current transformer RB are also very large, when circuit transmission load hour, the ice melting current that second siding ring W0 will export will be greater than primary side current, the number of turn of first siding ring (W1, W2) now will be higher than the number of turn of second siding ring W0, once, the wire diameter of second siding ring (W1, W2, W0) is all very thick.
Prior art all uses transformer as rectification source, and the use of the present invention current transformer identical with current transformer principle does rectification source.Following table contrasts the performance of transformer and current transformer.
The first siding ring of ice-melt current transformer RB at least needs to arrange two groups.At least need two groups of first siding rings (W1, W2) because form ice-melt loop.In addition, the DC loop-current that the alternating current of second siding ring (W0) output loads on ice-melt loop after rectifying installation also will flow through first siding ring (W1, W2), cancel out each other in order to make the direct current flux that DC loop-current produces in iron core, first siding ring (W1, W2) at least needs two groups, when more than two groups, must be even number set.Certainly preferred plan adopts two groups of first siding rings (W1, W2), manufactures and uses all simple.And two DC output ends of deicing device, must load on the same side (in Fig. 1 in left side) of ice-melt current transformer, so just can make DC loop-current pass through the direct current flux that two groups of first siding rings (W1, W2) produce afterwards in iron core and cancel out each other, in order to avoid the direct current flux that direct current produces makes iron core generation magnetic saturation.
The size of current that will export according to first siding ring electric current and second siding ring, the core dimensions of design ice-melt current transformer RB, the relevant parameter such as turn ratio, wire diameter once and between second siding ring.Line parameter circuit value difference, the parameter designing difference of ice-melt current transformer RB, prior art easily realizes, therefore no longer describe in detail.
Fig. 3 is the deicing device wiring block diagram of conductors on quad bundled circuit.In figure, two groups of first siding rings (W1, W2) of ice-melt current transformer RB seal in respectively a phase circuit (other two-phase does not draw) middle part sub-conductor L1 and L2 parallel connection, in the ice-melt loop that L3 and L4 parallel connection form afterwards, two ends, loop, by metal conductor spacer G electrical connection, all adopt insulation gap rod (not shown in FIG.) on ice-melt section central conductor.If wish is carried out ice-melt to whole piece circuit, conductor spacers all on circuit all adopt insulating material, rely on the intrinsic electrical connection short circuit sub-conductor in circuit both sides to form ice-melt loop.In figure, the second siding ring (W0) of ice-melt current transformer RB adopts the adjuster of carrying output, after becoming direct current, commutating circuit loads on middle part, ice-melt loop (left and right, ice-melt loop resistance equates part, loads on the left side of two first siding rings (W1, W2) in figure).Controller (not shown in FIG.) is controlled has the adjuster of carrying automatically to change tap joint position, regulates the output current of second siding ring W0, to meet ice-melt needs.Two groups of by-pass switches (P1, P2), the operation principle of controller and power unit (not shown in FIG.) is with identical described in Fig. 1.The by-pass switch (P1, P2) that also can save first siding ring in figure (W1, W2) both sides, only arranges one group of by-pass switch P(in the outlet of its second siding ring W0 and describes in detail in Fig. 4 example).For other even number division circuit, as 6,8,10 isotomy wires, can be in like manner respectively two groups of two groups of first siding rings (W1, W2) that seal in respectively ice-melt current transformer RB by 3,4,5 root wire parallel connections.
Fig. 4 is the deicing device wiring block diagram of five bundle conductor circuits.At line ice-melting section middle part, by the sub-conductor L1 in a phase circuit (other two-phase does not draw), L2, after L3 parallel connection, seal in the first siding ring W1 of ice-melt current transformer RB, by sub-conductor L4, after L5 parallel connection, seal in another group first siding ring W2 of ice-melt current transformer RB, ice-melt section two ends are used metal conductor spacer G by the sub-conductor ice-melt loop that is electrically connected to form, conductor spacer on ice-melt section lead is replaced by insulation gap rod (not shown in FIG.), if during using whole piece circuit as ice-melt end, all conductor spacers on circuit are replaced by insulation gap rod, rely on the intrinsic electrical connection in circuit both sides that five oidiospore wires are connected together at circuit two ends and form ice-melt loop.In figure, second siding ring W0 exports through many taps, can control and select a road tap conducting by controller (not shown in FIG.), the alternating current of output accesses ice-melt loop after commutating circuit ZLQ becomes direct current, in figure, access is in the left side of two groups of first siding rings (W1, W2) (also can be on right side, but must be the same side of two groups of coils).In figure, by-pass switch P is arranged at the output of the second siding ring W0 of ice-melt current transformer RB, for the switching to ice-melt current transformer RB, in the time that by-pass switch P disconnects, ice-melt current transformer RB and package unit are in ice-melt operating state, in the time that by-pass switch P connects, ice-melt current transformer (RB) second siding ring (W0), by short circuit, is now the no-load running state of ice-melt current transformer RB, and the deicing device that do not have a power failure of the alternating current circuit of a whole set of multiple fission conductor exits ice-melt operating state.Now, the external no-output of second siding ring W0, primary side line current flows through the magnetic flux basic neutralisation that the first siding ring (W1, W2) of ice-melt current transformer RB and the short circuit current of second siding ring W0 produce, and ice-melt current transformer RB only can only produce less copper loss on less no-load loss and coil in iron core.Compare with Fig. 3 scheme with Fig. 1, save two by-pass switches (P1, P2) on ice-melt current transformer RB primary winding (W1, W2), only be provided with one group of by-pass switch P in second siding ring W0 outlet, scheme is more simple, but ice-melt current transformer RB wants frequent charging operation.
For the circuit of 3,7,9,11 odd number multiple fission conductors, all can, according to above-mentioned principle, at line ice-melting section middle part, will after 2,4,5,6 root wire parallel connections, seal in W1, will after 1,3,4,5 root wire parallel connections, seal in W2, other operation principle is identical.
The circuit that is solid conductor for 10KV, 35KV, the every phase circuit of 110KV, can transform as after double bundle conductor, the deicing device that do not have a power failure that re-uses the alternating current circuit of the multiple fission conductor of the present invention ice-melt that do not have a power failure.
Claims (4)
1. the de-icing method that do not have a power failure of the alternating current circuit of a multiple fission conductor, it is characterized in that, the method at least one ice-melt current transformer of all connecting on each phase circuit at line ice-melting section middle part, every ice-melt current transformer at least arranges two groups of first siding rings and at least one group of second siding ring, two groups of first siding rings seal in a phase circuit middle part makes this phase current divide two-way to flow through two groups of first siding rings the secondary current of inducting in second siding ring, second siding ring is through tap or have the adjuster of carrying output, the alternating current of its output loads on the ice-melt loop formation ice-melt circulation that this many oidiospores of phase circuit wire forms after commutating circuit becomes direct current, control after the caloric value stack of ice-melt circulation and the load current of circuit own, reach and protect line effect or ice-melt effect.
2. the method for claim 1, it is characterized in that, described ice-melt current transformer is by least two group first siding ring (W1, W2) and at least one group of second siding ring (W0) be jointly wound on same iron core-closed upper composition, two groups of primary winding (W1 wherein, W2) mutually insulated and between second siding ring (W0), and contact by the iron core-closed magnetic of setting up, when alternating current in the same way flows through two groups of first siding ring (W1, W2) time, connect second siding ring (W0) at the equidirectional magnetic flux of iron core-closed middle generation key, at second siding ring (W0) secondary current of inducting, second siding ring (W0) outlet arranges tap or has the adjuster of carrying, to regulate the size of second siding ring (W0) output current, second siding ring (W0) outlet can move by bringing onto load, or short circuit operation is in Light Condition, but can not open circuit operation, and:
When the second siding ring (W0) of ice-melt current transformer is during through many taps output, by the selection of diverter switch or electronic switch, make many taps have a road at least in conducting state, become direct current to load on ice-melt loop through commutating circuit (ZLQ) alternating current of output;
Or, when the second siding ring (W0) of ice-melt current transformer is in the time having the adjuster of carrying output, the alternating current of output is loaded on to ice-melt loop after commutating circuit (ZLQ) becomes direct current;
Or in the time that an ice-melt current transformer has multiple second siding rings (W0), multiple second siding rings (W0) can be exported after serial or parallel connection.
3. the deicing device that do not have a power failure of the alternating current circuit of the multiple fission conductor that described in claim 1 or 2 prepared by method, is characterized in that, on each phase circuit at line ice-melting section middle part, by least one ice-melt current transformer (RB), at least one rectifier bridge (ZLQ), a set of controller and power unit (KZQ), two groups of by-pass switch (P1, P2) composition, wherein, ice-melt current transformer (RB) has two groups of first siding ring (W1 at least, W2) and at least one group of second siding ring (W0) be wound on same iron core-closed above, at every phase line ice-melting section middle part, seal in respectively two groups of first siding ring (W1 of ice-melt current transformer (RB) after will bundle conductor bundle (L) point two groups of parallel connections, W2), make every phase line current divide two-way to flow through two groups of primary winding (W1, W2), for 2, 4, 6, 8, 10, the bundle conductor bundle (L) of even number, two groups of first siding ring (W1, W2) seal in respectively 1, 2, 3, 4, 5 oidiospore bundle conductors (L), for 3, 5, 7, 9, 11, odd number bundle conductor, first group of first siding ring (W1) seals in 2, 3, 4, 5, 6 oidiospore bundle conductors (L), second group of first siding ring (W2) seals in 1, 2, 3, 4, 5 oidiospore bundle conductors (L), two groups of by-pass switch (P1, P2) be connected in parallel on respectively two first siding ring (W1 of ice-melt current transformer (RB), W2) two ends, ice-melt current transformer (RB) second siding ring (W0) is through tap or have the adjuster of carrying output, and be electrically connected with the AC of rectifier bridge (ZLQ), the DC side of rectifier bridge (ZLQ) is electrically connected with the ice-melt loop of multiple fission conductor (L) composition, and controller and power unit (KZQ) are controlled the operation of whole device.
4. the deicing device that do not have a power failure of the alternating current circuit of multiple fission conductor as claimed in claim 3, it is characterized in that, when the by-pass switch (P1, P2) of described ice-melt current transformer (RB) first siding ring (W1, W2) two ends parallel connection saves, at the output by-pass switch in parallel (P) of ice-melt current transformer (RB) second siding ring (W0).
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Cited By (7)
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| CN104567983A (en) * | 2015-01-08 | 2015-04-29 | 国家电网公司 | Phytotron de-icing test platform for extra-high voltage divided conductors |
| CN106207863A (en) * | 2016-09-26 | 2016-12-07 | 南京工程学院 | A kind of based on the THE UPFC de-icing method of synchronization paralleling device between electrical network |
| CN109038445A (en) * | 2018-08-23 | 2018-12-18 | 国网湖南省电力有限公司 | A kind of electrification deicing topology system and its de-icing method based on step-down capacitor |
| CN109088384A (en) * | 2018-09-30 | 2018-12-25 | 南京电力金具设计研究院有限公司 | A kind of overhead transmission line conductors on quad bundled ice-melt short jumper device |
| CN110535061A (en) * | 2019-07-15 | 2019-12-03 | 贵州电网有限责任公司 | One kind being used for the online ice-melt substation back brake method of electric line |
| CN113011013A (en) * | 2021-03-03 | 2021-06-22 | 贵州电网有限责任公司 | Method for calculating grouped ice melting time of sub-conductors of high-voltage overhead transmission line |
| CN114530814A (en) * | 2022-04-15 | 2022-05-24 | 西南交通大学 | Direct-current ice melting system for electrified railway contact network and control method thereof |
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| CN201178282Y (en) * | 2008-04-17 | 2009-01-07 | 李杨扬 | Loaded operating ice melting system for high-voltage power transmission line |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104567983A (en) * | 2015-01-08 | 2015-04-29 | 国家电网公司 | Phytotron de-icing test platform for extra-high voltage divided conductors |
| CN106207863A (en) * | 2016-09-26 | 2016-12-07 | 南京工程学院 | A kind of based on the THE UPFC de-icing method of synchronization paralleling device between electrical network |
| CN109038445A (en) * | 2018-08-23 | 2018-12-18 | 国网湖南省电力有限公司 | A kind of electrification deicing topology system and its de-icing method based on step-down capacitor |
| CN109088384A (en) * | 2018-09-30 | 2018-12-25 | 南京电力金具设计研究院有限公司 | A kind of overhead transmission line conductors on quad bundled ice-melt short jumper device |
| CN109088384B (en) * | 2018-09-30 | 2023-11-10 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Overhead transmission line four-split conductor deicing shorting device |
| CN110535061A (en) * | 2019-07-15 | 2019-12-03 | 贵州电网有限责任公司 | One kind being used for the online ice-melt substation back brake method of electric line |
| CN113011013A (en) * | 2021-03-03 | 2021-06-22 | 贵州电网有限责任公司 | Method for calculating grouped ice melting time of sub-conductors of high-voltage overhead transmission line |
| CN113011013B (en) * | 2021-03-03 | 2023-04-28 | 贵州电网有限责任公司 | Grouping ice melting time calculation method for sub-conductors of high-voltage overhead transmission line |
| CN114530814A (en) * | 2022-04-15 | 2022-05-24 | 西南交通大学 | Direct-current ice melting system for electrified railway contact network and control method thereof |
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| CN103915809B (en) | 2016-08-17 |
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