CN104157433A - Split blowout on-load tap changer for transformer - Google Patents
Split blowout on-load tap changer for transformer Download PDFInfo
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- CN104157433A CN104157433A CN201410330722.3A CN201410330722A CN104157433A CN 104157433 A CN104157433 A CN 104157433A CN 201410330722 A CN201410330722 A CN 201410330722A CN 104157433 A CN104157433 A CN 104157433A
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Abstract
The invention discloses a split blowout on-load tap changer for a transformer. The split blowout on-load tap changer comprises a tap selector and a diverter switch; the diverter switch comprises a power circuit, a control circuit and a control power supply; the tap selector realizes selection of the number of winding turns of the transformer, and a moving contact of the tap selector is connected with one fixed contact of the power circuit; each fixed contact of the power circuit is connected with a direct contact and a bilateral switch branch; the bilateral switch branch is formed by connecting two electronic power switches, then parallelly connecting the two connected electronic power switches with a buffer circuit and finally serially connecting the three with a fuse; buffer circuits are parallelly connected among the fixed contacts of the power circuit; the control circuit comprises a communication unit, a trigger unit and a detection unit; on and off of the bilateral switch branch are controlled according to data detected by the detection unit. Blowout switching of the split blowout on-load tap changer is realized, expansion of accidents caused by faults of a bilateral switch is prevented, devices are protected from damages, and the split blowout on-load tap changer is simple in structure and reliable in operation.
Description
Technical field
The present invention relates to transformer regulating technical field, more specifically relate to a kind of transformer split type without arc on load tap changer.
Background technology
In the prior art, operating distribution transformer, due to the variation of primary side voltage, load and character, secondary side voltage may have a greater change.China's distribution transformer covers the following electric pressure of 35kV, in order to make load voltage maintain prescribed limit, ensures the normal need of power consumption equipment, must carry out pressure regulation to distribution transformer.
The general principle of transformer on-load voltage regulating is from a certain side of transformer, be generally and on high-tension side coil, draw some taps, pass through on load tap changer, in the situation that not cutting off load current, by a tap-change operation to another tap, with conversion effective turn, reach regulation voltage object.On-load tap-changing transformer is made up of two parts, and a part is transformer body, and different from common transformer is to draw multiple taps, and another part is on load tap changer, can be supplied and be assembled and obtain again by different manufacturers respectively.
Typical transformer on load tap changer has mechanical type and the large class of vacuum type two.Mechanical type on load tap changer has integral type and split type two kinds of structures.
In integrated mechanical on load tap changer, tapping directly surrounds a round, and each tap forms a fixed contact.Moving contact is made up of the contact with transition resistance and straight-through contact, can adopt single transition resistance, two transition resistance or many transition resistances pattern, and moving contact is dragged and realized fixed contact switching by diverter switch drive motors.
Separate mechanical on load tap changer is made up of switching selector and diverter switch.Switching selector is made up of two annulus, connect respectively odd number and even numbers tap, drag tap selector moving contact by tap selector drive motors and be communicated with respectively a tap, two moving contact outputs of tap selector are as two fixed contacts of diverter switch, each fixed contact is installed transition resistance, form two electric resistance structures, when stable state, only have a contact to be connected with output cable.The moving contact of diverter switch only has a straight-through contact, is dragged by a fixed contact and is switched to another fixed contact by diverter switch drive motors.
Vacuum shunting switch generally adopts split-type structural, switches tapping by tap selector.The fixed contact of diverter switch connects respectively a vacuum switch, and a transition vacuum switch is installed between two fixed contacts, between transition vacuum switch and one of them fixed contact, transition resistance is installed.Three vacuum switch outputs have two kinds of structures: be fixedly connected with and mobile link.Being fixedly connected with three vacuum switch outputs in mode can be fixedly connected with winding after short circuit, only realizes electric current by control vacuum switch and shifts in different taps.Mobile link mode adopts a moving contact, moving contact only has a straight-through contact, drag by a fixed contact and switch to another fixed contact by diverter switch drive motors, in moving process, vacuum switch is realized in real-time judge moving contact position disconnectedly closes control, guarantee Transformer Winding is not opened a way, not short circuit of tapping.
The problem that prior art exists has: mechanical type shunting switch produces electric arc in tap changing process, causes contact ablation; When vacuum shunting switch adopts stationary structure, off-state vacuum switch bears voltage always, needs to press system voltage design, and the time of closing because vacuum switch is disconnected in the time adopting portable structure is slow, and the movement velocity of moving contact need coordinate with it, wayward; And above-mentioned shunting switch all needs transition resistance, increase loss.
Have at present a kind of full electronic shunting switch structure, form electronic switch by power electronic device such as thyristors, each Transformer Winding tap connects an electronic switch, realizes tap changing, and do not need transition resistance by certain sequencing control.This scheme is high to electronic switch requirement of withstand voltage, and complex structure is expensive.
Also have a kind of electro-mechanical mixed shunting switch structure, be equivalent to two transition resistances of mechanical type shunting switch to replace with antiparallel thyristor respectively, coordinate and realize tap changing by disconnected the closing with the shift position of straight-through contact of controlling thyristor.In this scheme, because thyristor is half control device, the sequential mix proportion that realizes thyristor break-make in the time that moving contact moves is more difficult.
In addition, also has another kind of electro-mechanical mixed shunting switch mechanism, be equivalent to two transition resistances of mechanical type shunting switch to replace with the electronic power switch of two anti-series respectively, coordinate and realize tap changing by disconnected the closing with the shift position of straight-through contact of controlling electronic power switch.In this scheme, electronic power switch adopts the full control such as IGBT or MOSFET device.
Above-mentioned two kinds of electro-mechanical mixed structures are in handoff procedure, and electronic power switch, if there is fault, while being short-circuit condition, can make short circuit in winding after fault, and this situation has solution; But while being open-circuit condition after fault, can make the whole voltage of whole pressure regulation lateral coil be added in electronic power switch two ends, be punctured, and burn control section.
For this fault, having another kind of structure is the transition resistance in parallel at electronic power switch two ends on this basis, and when electronic power switch breaks down result during for open circuit, still on load tap changer uses routinely.In handoff procedure, still there is arcing process in this scheme, cannot realize on load tap changer without arc.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention be how to realize transformer have carry handoff procedure without arc, the situation of short circuit or open circuit that simultaneously occurs in handoff procedure can not damaged device, stops in time handoff procedure.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of transformer split type without arc on load tap changer, described a kind of transformer is split type comprises tap selector, diverter switch without arc on load tap changer; Described diverter switch comprises by loop of power circuit and control loop;
The moving contact of described tap selector connects the fixed contact of described loop of power circuit; Each fixed contact of described loop of power circuit is all connected with straight-through contact and bidirectional switch branch road; After described bidirectional switch props up two electronic power switches of route and is connected, a buffer circuit in parallel, then be in series with a fuse; Parallel connection buffer circuit between the described fixed contact of stating loop of power circuit;
Described control loop comprises trigger element and detecting unit; Described detecting unit detects pressure drop between electric current, two fixed contacts of electric current, the pressure drop of described bidirectional switch branch road, described loop of power circuit fixed contact and the electric current of described straight-through contact, and backward the calculation of parameter obtaining described trigger element is issued to control command, provide triggering signal by described trigger element for the electronic power switch of described bidirectional switch branch road.
Preferably, described buffer circuit is an electric capacity or resistance-capacitance circuit.
Preferably, the quantity of the fixed contact of described loop of power circuit is 2.
Preferably, described diverter switch also comprises control power subsystem, the step voltage of described control power subsystem taking the pressure drop of two fixed contacts of described loop of power circuit as input, and provide power supply for described control loop.
Preferably, described control loop also comprises communication unit, and the data upload that described communication unit detects described detecting unit is to host computer, and drives the moving contact of diverter switch and the moving contact of tap selector to move by described PC control drive motors.
Preferably, described control power subsystem is converted to direct voltage by isolation and the translation circuit of its inside by the step voltage of input.
Preferably, described electronic power switch adopts the half control device of thyristor or the full control device of IGBT, MOSFET.
Preferably, when described electric power electric switch adopts the half control device of thyristor, the form of being connected of two electronic power switches is that inverse parallel connects; When described electronic power switch adopts the full control device of IGBT, MOSFET, the form of being connected of two electronic power switches is that anti-series connects.
(3) beneficial effect
The invention provides a kind of transformer split type without arc on load tap changer, by using bidirectional switch and the triggering sequencing control to bidirectional switch, realize the commutating without arcing of split type on load tap changer, prevent from causing when bidirectional switch from breaking down fault spread, do not damage device, and simple in structure, reliable operation.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the split type circuit diagram without arc on load tap changer of a kind of transformer of a preferred embodiment of the present invention;
Fig. 2 is the structural representation of the split type control loop without arc on load tap changer of a kind of transformer of a preferred embodiment of the present invention;
Fig. 3 is the structural representation of the split type control power subsystem without arc on load tap changer of a kind of transformer of a preferred embodiment of the present invention;
Fig. 4 a-4e is that the moving contact of the split type diverter switch without arc on load tap changer of a kind of transformer of a preferred embodiment of the present invention is switched to R2 status of processes figure by R1;
Fig. 5 a-5d is the split type electronic switch sequencing control state diagram without arc on load tap changer of a kind of transformer of a preferred embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Following examples are used for illustrating the present invention, but can not be used for limiting the scope of the invention.
Fig. 1 is the split type circuit diagram without arc on load tap changer of a kind of transformer of a preferred embodiment of the present invention; Described a kind of transformer is split type comprises tap selector, diverter switch without arc on load tap changer; Described diverter switch comprises by loop of power circuit, control loop, control power subsystem.
Described tap selector is realized the selection of the Transformer Winding number of turn, and it selects tap in the time of zero load, is then realized having to carry by diverter switch and switches.The moving contact of described tap selector connects the fixed contact of described loop of power circuit, i.e. the first fixed contact R1, the second fixed contact R2; The odd number tap of transformer is that J1, J3 etc., even numbers tap are J2, J4 etc., described tap selector comprises two annulus, i.e. the first tap selector and the second tap selector, the fixed contact of described the first tap selector is connected with odd number tap J1, J3 etc. respectively, and the fixed contact of described the second tap selector is connected with even numbers tap J2, J4 etc. respectively.
The first fixed contact R1 of described loop of power circuit is connected with one end of first straight-through contact K1, the first bidirectional switch branch road S1 respectively, described the second fixed contact R2 is connected with one end of the second bidirectional switch branch road S2, the second straight-through contact K2 respectively, parallel connection buffer circuit C3 between described the first fixed contact R1 and the second fixed contact R2, the moving contact of described the first tap selector and the second tap selector drags and can connect with transformer tap through drive motors.One end of the moving contact D of diverter switch is connected with outlet terminal N, and its other end is connected by dragging successively with the other end of the second bidirectional switch branch road S2 and the other end of the second straight-through contact K2 on the other end, the second fixed contact R2 of the other end that is connected to the straight-through contact K1 of first on the first fixed contact R1, the first bidirectional switch branch road S1 of diverter switch motor.
After described bidirectional switch props up two electronic power switches of route and is connected, a buffer circuit in parallel, then be in series with a fuse.In Fig. 1, S11, S12, S21, S22 represent electronic power switch, form the first bidirectional switch branch road S1 by the first single-way switch S11, the second single-way switch S12, buffer circuit C1 and fuse M1, form the second bidirectional switch branch road S2 by the 3rd single-way switch S21, the 4th single-way switch S22, buffer circuit C2 and fuse M2.Described buffer circuit C1, C2 act as: bidirectional switch branch road disconnects moment, and in current circuit, inductance department branch forms overvoltage, and buffer circuit now plays a protective role to bidirectional switch branch road.Described fuse M1, M2 act as: in the time that bidirectional switch branch trouble result is short circuit, switch fuse if continue and can fuse to avoid short circuit in winding, complete after this switching, fault-signal is uploaded to host computer by the control unit of described control loop, quiescing.
In the time that bidirectional switch branch trouble result is open circuit, will cause load open circuit, the parameter value that the detecting unit in described control loop detects can be identified this fault, and forbids continuing operation.When described electronic power switch adopts the full control device of IGBT, MOSFET, the form of being connected of two electronic power switches is that anti-series connects.Electric power electric switch in the present embodiment adopts IGBT, the feature of such devices is that forward can bear high voltage, oppositely do not bear voltage, generally diode of inverse parallel with it, forms single-way switch, and two single-way switch anti-series are formed to bidirectional switchs, the the first bidirectional switch branch road S1 forming taking the first single-way switch S11 and the second single-way switch S12 is as example, in the time not applying triggering signal, two single-way switch are all in off state, and described the first bidirectional switch branch road S1 is in off-state; In the time that the first single-way switch S11 bears positive voltage, apply triggering signal to the first single-way switch S11, the diode of the first single-way switch S11 and the second single-way switch S12 forms path, i.e. the first bidirectional switch branch road S1 conducting; In the time that the second single-way switch S12 bears positive voltage, apply triggering signal to the second single-way switch S12, the diode of this single-way switch and the first single-way switch S11 forms path, i.e. the first bidirectional switch branch road S1 conducting; Do not apply triggering signal if bear the single-way switch of positive voltage, and apply triggering signal to the another single-way switch of anti-series, described the first bidirectional switch branch road S1 can not conducting; In the time that the first single-way switch S11 and the second single-way switch S12 apply triggering signal simultaneously, regardless of voltage direction, described the first bidirectional switch branch road S1 is in on-state.
Fig. 2 is the structural representation of the split type control loop without arc on load tap changer of a kind of transformer of a preferred embodiment of the present invention; Described control loop comprises communication unit, trigger element and detecting unit; Current i K1, the second straight-through pressure drop of lifting one's head between the current i K2 of K2 and the current i 1 of described loop of power circuit fixed contact R1, R2, i2, two fixed contacts that described detecting unit detects pressure drop uS1, uS2, the first straight-through contact K1 of current i S1, iS2 that described bidirectional switch branch road flows through, bidirectional switch branch road are step voltage U
0.The current i 1 of described fixed contact and the effect of i2 are the load current i of the two addition transformer terminal of being equivalent to any time, while being used for judging sequential, use, because control loop is mounted on fixed contact, and load current i is in moving contact side, be not easy to gather, so gather i1 and i2; Pressure drop U between two fixed contacts
0be used for and uS1, uS2 compares, and detects bidirectional switch and whether bears step voltage.IS1, uS1, iS2, uS2 use while judging sequential in switching.
Backward the calculation of parameter obtaining described trigger element is issued control command by described detecting unit, provides trigger voltage by described trigger element for the electronic power switch of described bidirectional switch branch road; Described communication unit comprises the first communication unit, the second communication unit and the 3rd communication unit, the information exchange that described the 3rd communication unit detects described detecting unit is crossed the second communication unit, the first communication unit is uploaded to host computer, described PC control drive motors control unit, drive motors, controls the moving contact of diverter switch and the action of the moving contact of tap selector.
Fig. 3 is the structural representation of the split type control power subsystem without arc on load tap changer of a kind of transformer of a preferred embodiment of the present invention; The control power subsystem of described diverter switch, input is connected with described the first fixed contact R1, the second fixed contact R2, is step voltage U
0, output U
dCVfor 24V direct voltage, it is described control loop power supply.The isolation of control power supply inside and translation circuit are converted to step voltage can be for the direct current of control loop, wherein, due to according to the difference of transformation model, the magnitude of voltage of step voltage from hundreds of to thousands of not etc., consider insulating requirements, described voltage transitions can adopt power frequency isolation or high-frequency isolation power technology, wherein, high-frequency isolation technology is isolated small volume with respect to power frequency, is easy to install.
The process of below moving contact of described diverter switch being switched describes:
Described diverter switch moving contact D can switch to the second fixed contact R2 by the first fixed contact R1, or switches to the first fixed contact R1 by the second fixed contact R2.If when stable state, diverter switch moving contact D be connected to the straight-through contact K1 of first on the first fixed contact R1 and be connected, load current is through winding end of incoming cables L, the winding of flowing through, the a certain fixed contact of the first tap selector, the first fixed contact R1, the first straight-through contact K1, diverter switch moving contact D is to outlet terminal N, thus formation current path.Suppose now to receive host computer instruction, diverter switch moving contact D is switched to the second fixed contact R2 by the first fixed contact R1 upper, the process that diverter switch moving contact D moves, as shown in Fig. 4 a-4e, herein in order to simplify, is only expressed diverter switch part.
When the moving contact D of described diverter switch moves to the second straight-through contact K2 position by the first straight-through contact K1, mechanical action is a continuous process, time used is the millisecond order of magnitude, in this moving process, the first single-way switch S11 of the first bidirectional switch branch road S1 and the second single-way switch S12, the 3rd single-way switch S21 of the second bidirectional switch branch road S2 and the 4th single-way switch S22 coordinate by certain sequential, realize the commutating without arcing by the straight-through contact K2 of the first straight-through contact K1 to the second, the switching time of electronic switch is in microsecond magnitude, can in Mechanical Moving process, complete switching completely.The key that realizes commutating without arcing in the present invention is, electric handoff procedure must be controlled disconnected the closing of the first bidirectional switch branch road S1 and the second bidirectional switch branch road S2 in the time of the different shift position of mechanical process, and disconnected must be according to certain sequential, to avoid load open circuit or short circuit in winding in closing process.
When completing under the driving of tap selector at motor after no-load transfers the files, drive the moving contact D of described diverter switch to move, establish by the first fixed contact R1 and move to the second fixed contact R2.When moving contact D moves to position shown in Fig. 4 b chronologically, diverter switch moving contact D is all connected with the first straight-through contact K1 and the first bidirectional switch branch road S1, now the first bidirectional switch is not bear positive voltage, described detecting unit detects the current i K1 of the first straight-through contact K1, in the time of iK1>0, trigger the first single-way switch S11, make the first bidirectional switch branch road S1 conducting; In the time of iK1<0, trigger the second single-way switch S12, make the first bidirectional switch branch road S1 conducting.Now, because the resistance of the first straight-through contact K1 is little, although the first single-way switch S11 and the second conducting of single-way switch S12, load current still flows through from the first straight-through contact K1.
Along with diverter switch moving contact D continues mobile, arrive position shown in Fig. 4 c, diverter switch moving contact D is all connected with the first bidirectional switch branch road S1 and the second bidirectional switch branch road S2, by Fig. 4 b state in the moving process of Fig. 4 c state, in the time that diverter switch moving contact D is not connected with the second bidirectional switch branch road S2, because the second double line switching branches S2 is in floating dummy status, voltage reduces to zero; When diverter switch moving contact D moves to while being all connected with the first bidirectional switch branch road S1 and the second bidirectional switch branch road S2, because the second bidirectional switch branch road S2 is in off-state, must bear the winding step voltage U between the first fixed contact R1 and the second fixed contact R2
o, the step voltage that described control loop detecting unit detects becomes U from 0
obe the foundation that diverter switch moving contact D is connected with the second bidirectional switch branch road S2, save mechanical location decision mechanism, now switching sequence starts, need the bearing data of load current, if electric current flows to moving contact D for just from the first fixed contact R1, be load current i>0, on the contrary i<0.Have 4 kinds of operating modes according to load current direction and diverter switch direction, as shown in Fig. 5 a-5d.Wherein Fig. 5 a and Fig. 5 b all represent the process of being switched to the second bidirectional switch branch road S2 by the first bidirectional switch branch road S1, the load current i>0 of Fig. 5 a; The load current i<0 of Fig. 5 b; Fig. 5 c and 5d all represent the process of being switched to the first bidirectional switch S1 by the second bidirectional switch S2, the load current i>0 of Fig. 5 c; The load current i<0 of Fig. 5 d.
Explain this handoff procedure below as an example of Fig. 5 a example, its operating mode is i>0, and the first single-way switch S11 and the second single-way switch S12 are conductings, and now the second bidirectional switch branch road S2 bears step voltage U
0, load current the flow through switching tube of the first single-way switch S11 and the diode of the second single-way switch S12, i.e. state before the t1 moment in Fig. 5 a; Turn-off the second single-way switch S12 in the t1 moment, do not affect the circulation of load current, time delay certain hour is to t2, and for example 3 microseconds are to guarantee the reliable turn-off of the second single-way switch S12; Open the 3rd single-way switch S21 in the t2 moment, now load current two branch roads of flowing through, comprise that the switching tube of the first single-way switch S11 and the diode of the second single-way switch S12 are as a branch road, the diode of the switching tube of the 3rd single-way switch S21 and the 4th single-way switch S22 is as another branch road, guarantee not short circuit of winding in handoff procedure, load is not opened a way, and time delay certain hour is down to zero to guarantee current i to t3; Turn-off the first single-way switch S11 in the t3 moment, load current is all transferred on the second bidirectional switch branch road S2, time delay to t4 to guarantee the first single-way switch S11 reliable turn-off, now the flow through switching tube of the 3rd single-way switch S21 and the diode of the 4th single-way switch S22 of load current; Open the 4th single-way switch S22 in the t4 moment, so far, the first bidirectional switch branch road S1 turn-offs completely, and the second bidirectional switch branch road S2 is completely open-minded.When load current is all transferred to the second bidirectional switch branch road S2, diverter switch moving contact D continues mobile, when the first bidirectional switch branch road S1 and diverter switch moving contact D disconnect, can not cause load open circuit, has played the effect of extinguishing arc.
In Fig. 4 c handoff procedure, the moment that the first bidirectional switch branch road S1 turn-offs, because electric current in inductance can not suddenly change, in the winding of transformer cut-out, can form overvoltage, now buffer circuit C3 forms path, and bidirectional switch on S1 branch road is played a protective role.
When diverter switch moving contact D moves to as Fig. 4 d position, diverter switch moving contact D is connected with the second bidirectional switch branch road S2 and the second straight-through contact K2, because the second resistance that leads directly to contact K2 is much smaller than the second bidirectional switch branch road S2, current transfer to the second leads directly to contact K2, when detecting the second bidirectional switch branch road S2 current i S2, control loop detecting unit is decreased to suddenly while approaching zero, can judge that diverter switch moving contact D is communicated with the second straight-through contact K2, now can turn-off the second bidirectional switch branch road S2.When diverter switch moving contact D moves to as Fig. 4 e position, diverter switch moving contact D is only connected with the second straight-through contact K2, and so far, a handoff procedure all completes.
Its excess-three kind operating mode operation principle is basic identical, can understand with reference to figure 5b-5d, no longer repeats.
The work schedule when employing providing according to above-described embodiment Fig. 5 b-5d is controlled device entirely, the control sequential while can Analogy going out to adopt half control device, no longer repeats.
Above-described embodiment has been explained operation principle of the present invention and basic comprising as an example of single-phase winding example, structure shown in Fig. 1 can be passed through simple extension, just can be used for three-phase structure, the tap of three-phase on-load tap-changing transformer has the structures such as the tap of three-phase star neutral point, the tap of angle scheme end and angle scheme centre tap, no matter which kind of structure, does not affect use of the present invention.
A kind of transformer provided by the invention is split type without arc on load tap changer, by using bidirectional switch and the triggering sequencing control to bidirectional switch, realize the commutating without arcing of split type on load tap changer, prevent from causing when bidirectional switch from breaking down fault spread, do not damage device, and simple in structure, reliable operation.
Above execution mode is only for the present invention is described, but not limitation of the present invention.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is carried out to various combinations, revises or is equal to replacement, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (8)
1. transformer is split type without an arc on load tap changer, comprises with transformer terminal and is connected moving contact, it is characterized in that, described a kind of transformer is split type comprises tap selector, diverter switch without arc on load tap changer; Described diverter switch comprises by loop of power circuit and control loop;
The moving contact of described tap selector connects the fixed contact of described loop of power circuit; Each fixed contact of described loop of power circuit is all connected with a straight-through contact and a two-way switching branches; After described bidirectional switch props up two electronic power switches of route and is connected, a buffer circuit in parallel, then be in series with a fuse; Parallel connection buffer circuit between the described fixed contact of stating loop of power circuit; Described moving contact motion process successively with being connected of described through swtich, bidirectional switch branch road;
Described control loop comprises trigger element and detecting unit; Described detecting unit detects pressure drop between electric current, two fixed contacts of electric current, the pressure drop of described bidirectional switch branch road, described loop of power circuit fixed contact and the electric current of described straight-through contact, and backward the calculation of parameter obtaining described trigger element is issued to control command, provide triggering signal by described trigger element for the electronic power switch of described bidirectional switch branch road.
2. a kind of transformer according to claim 1 is split type is characterized in that without arc on load tap changer, and described buffer circuit is an electric capacity or resistance-capacitance circuit.
3. a kind of transformer according to claim 1 is split type is characterized in that without arc on load tap changer, and the quantity of the fixed contact of described loop of power circuit is 2.
4. a kind of transformer according to claim 1 is split type without arc on load tap changer, it is characterized in that, described diverter switch also comprises control power subsystem, the step voltage of described control power subsystem taking the pressure drop of two fixed contacts of described loop of power circuit as input, and provide power supply for described control loop.
5. a kind of transformer according to claim 1 is split type without arc on load tap changer, it is characterized in that, described control loop also comprises communication unit, the data upload that described communication unit detects described detecting unit is to host computer, and drives the moving contact of diverter switch and the moving contact of tap selector to move by described PC control drive motors.
6. a kind of transformer according to claim 3 is split type is characterized in that without arc on load tap changer, and described control power subsystem is converted to direct voltage by isolation and the translation circuit of its inside by the step voltage of input.
7. a kind of transformer according to claim 1 is split type is characterized in that without arc on load tap changer, and described electronic power switch adopts the half control device of thyristor or the full control device of IGBT, MOSFET.
8. a kind of transformer according to claim 7 is split type is characterized in that without arc on load tap changer, and when described electric power electric switch adopts the half control device of thyristor, the form of being connected of two electronic power switches is that inverse parallel connects; When described electronic power switch adopts the full control device of IGBT, MOSFET, the form of being connected of two electronic power switches is that anti-series connects.
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| CN201410330722.3A CN104157433B (en) | 2014-07-11 | 2014-07-11 | A kind of split type no arc load ratio bridging switch of transformer |
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| CN201410330722.3A CN104157433B (en) | 2014-07-11 | 2014-07-11 | A kind of split type no arc load ratio bridging switch of transformer |
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| CN104660237A (en) * | 2015-03-13 | 2015-05-27 | 刘友仁 | One-out-three load transfer switch module |
| CN105261467A (en) * | 2015-11-10 | 2016-01-20 | 刁俊起 | Novel on-load voltage regulation switch of transformer |
| CN108269704A (en) * | 2017-12-29 | 2018-07-10 | 国网北京市电力公司 | Load ratio bridging switch and transformer |
| CN108768359A (en) * | 2018-04-03 | 2018-11-06 | 李晓明 | A kind of load ratio bridging switch and its method |
| CN110768212A (en) * | 2019-10-25 | 2020-02-07 | 南方电网科学研究院有限责任公司 | Transformer internal short-circuit fault protection device and control method thereof |
| CN111835247A (en) * | 2020-08-04 | 2020-10-27 | 上海华明电力设备制造有限公司 | Electronic on-load voltage regulator and tap unit thereof |
| CN114089679A (en) * | 2021-12-22 | 2022-02-25 | 全球能源互联网研究院有限公司 | Control equipment of on-load tap-changer and application method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660237A (en) * | 2015-03-13 | 2015-05-27 | 刘友仁 | One-out-three load transfer switch module |
| CN104660237B (en) * | 2015-03-13 | 2017-07-04 | 刘友仁 | A kind of one-out-three load switch module |
| CN105261467A (en) * | 2015-11-10 | 2016-01-20 | 刁俊起 | Novel on-load voltage regulation switch of transformer |
| CN108269704A (en) * | 2017-12-29 | 2018-07-10 | 国网北京市电力公司 | Load ratio bridging switch and transformer |
| CN108269704B (en) * | 2017-12-29 | 2019-09-06 | 国网北京市电力公司 | Load ratio bridging switch and transformer |
| CN108768359A (en) * | 2018-04-03 | 2018-11-06 | 李晓明 | A kind of load ratio bridging switch and its method |
| CN110768212A (en) * | 2019-10-25 | 2020-02-07 | 南方电网科学研究院有限责任公司 | Transformer internal short-circuit fault protection device and control method thereof |
| CN110768212B (en) * | 2019-10-25 | 2021-09-03 | 南方电网科学研究院有限责任公司 | Transformer internal short-circuit fault protection device and control method thereof |
| CN111835247A (en) * | 2020-08-04 | 2020-10-27 | 上海华明电力设备制造有限公司 | Electronic on-load voltage regulator and tap unit thereof |
| CN111835247B (en) * | 2020-08-04 | 2024-05-14 | 上海华明电力设备制造有限公司 | Electronic on-load voltage regulator and tap unit thereof |
| CN114089679A (en) * | 2021-12-22 | 2022-02-25 | 全球能源互联网研究院有限公司 | Control equipment of on-load tap-changer and application method thereof |
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