CN104157491A - Transformer integrated arc-free load-equipped tap switch - Google Patents
Transformer integrated arc-free load-equipped tap switch Download PDFInfo
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- CN104157491A CN104157491A CN201410329061.2A CN201410329061A CN104157491A CN 104157491 A CN104157491 A CN 104157491A CN 201410329061 A CN201410329061 A CN 201410329061A CN 104157491 A CN104157491 A CN 104157491A
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Abstract
The invention discloses a transformer integrated arc-free load-equipped tap switch. The transformer integrated arc-free load-equipped tap switch comprises a fixed contact connected with a transformer tapping, a moving contact D1 connected with a transformer outlet terminal and driven by a motor, and a controlling circuit, wherein the moving contact D1 comprises a first bilateral switch branch of which one end is connected with the outlet terminal, a direct connection contact terminal and a second bilateral switch branch; both of the first switch branch and the second bilateral switch branch are formed by adopting the structure that two power electronic switches are connected in a combined manner, then, a cushion circuits is connected with the two power electronic switches in parallel, and a fuse is connected in series. The bilateral switches and sequential control on triggering of the bilateral switches are adopted to realize arc-free switching of load-equipped tap switches, an accident during failure of the bilateral switches is prevented, reliable power supply is ensured for the controlling circuit, and the transformer integrated arc-free load-equipped tap switch is simple in structure and reliable in working.
Description
Technical field
The present invention relates to transformer regulating technical field, more specifically relate to a kind of transformer integral 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 integral type without arc on load tap changer, comprise the fixed contact that is connected with transformer tapping, be connected with transformer terminal by motor-driven moving contact, it also comprises control loop;
Described moving contact comprises the first bidirectional switch branch road, straight-through contact, the second bidirectional switch branch road that one end is connected with outlet terminal; After described the first switching branches and the second bidirectional switch branch road are connected by two electronic power switches, a buffer circuit in parallel, then be in series with a fuse;
Described control loop comprises trigger element and detecting unit; Described detecting unit detects electric current, the electric current of described straight-through contact, described the first bidirectional switch branch road, the electric current of the second bidirectional switch branch road and the pressure drop of pressure drop and adjacent two fixed contacts that described outlet terminal flows through, and the data that obtain are calculated to backward described trigger element issue control command, provide triggering signal by described trigger element for the electronic power switch of described the first bidirectional switch branch road, the second bidirectional switch branch road.
Preferably, parallel connection buffer circuit between described the first switching branches and the second bidirectional switch branch road.
Preferably, described buffer circuit is an electric capacity or resistance-capacitance circuit.
Preferably, in moving contact moving process, described the first bidirectional switch branch road, straight-through contact, the second bidirectional switch branch road successively with being connected of described each fixed contact.
Preferably, the described control power subsystem that also comprises, described control power subsystem is made input stage voltage with the pressure drop of described adjacent two fixed contacts, and is described control loop power supply.
Preferably, also comprise other one group of fixed contact being connected with transformer tapping, the pressure drop of wherein adjacent two contacts of described other one group of fixed contact is described control power subsystem power supply.
Preferably, described control loop also comprises communication unit and electric-motor drive unit, and the data upload described detecting unit being detected by described communication unit, to host computer, by described PC control drive motor units, drives described moving contact action.
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, is described control loop power supply by discharge module, is its inner charging module charging simultaneously; The input stage voltage of described control power subsystem is 1 o'clock, is that described charging module is described control loop power supply by described discharge module.
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 integral type without arc on load tap changer, the present invention is by using bidirectional switch and the triggering sequencing control to bidirectional switch, realize the commutating without arcing of on load tap changer, prevent from causing when bidirectional switch from breaking down fault spread, ensure the reliable power supply of control loop, 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 that a kind of transformer integral type of a preferred embodiment of the present invention is without the circuit diagram of arc on load tap changer;
Fig. 2 is that a kind of transformer integral type of a preferred embodiment of the present invention is without the structural representation of the control loop of arc on load tap changer;
Fig. 3 is that a kind of transformer integral type of a preferred embodiment of the present invention is without the structural representation of the control power subsystem of arc on load tap changer;
Fig. 4 a-4e is that a kind of transformer integral type of a preferred embodiment of the present invention is switched to R2A status of processes figure without the moving contact D1 of the diverter switch of arc on load tap changer by R1A;
Fig. 5 a-5c is that a kind of transformer integral type of a preferred embodiment of the present invention is the state diagram of controlling power subsystem power supply without other one group of fixed contact of arc on load tap changer;
Fig. 6 a-6d is that a kind of transformer integral type of a preferred embodiment of the present invention is without the electronic switch sequencing control state diagram of arc on load tap changer.
Fig. 7 is that a kind of transformer integral type of a preferred embodiment of the present invention is without the stereogram of arc on load tap changer.
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 that a kind of transformer integral type of a preferred embodiment of the present invention is without the circuit diagram of arc on load tap changer; Described switch comprise the fixed contact that is connected with transformer tapping, be connected with transformer terminal by motor-driven moving contact D1, it also comprises control loop.Described moving contact D1 comprises the first bidirectional switch branch road, straight-through contact, the second bidirectional switch branch road that one end is connected with outlet terminal; After described the first switching branches and the second bidirectional switch branch road are connected by two electronic power switches, a buffer circuit in parallel, then be in series with a fuse.Parallel connection buffer circuit C3 between described the first switching branches and the second bidirectional switch branch road.
In 1 figure, L, N represent respectively Transformer Winding inlet wire and outlet terminal, in the present embodiment, electronic power switch adopts insulated gate bipolar transistor, English full name is Insulated Gate Bipolar Transistor, IGBT write a Chinese character in simplified form in English, form bidirectional switch by two IGBT anti-series, each bidirectional switch two ends buffer circuit in parallel, connect with a fuse again and form bidirectional switch branch road, i.e. the first single-way switch S11, the second single-way switch S12, buffer circuit C1 and fuse M1 form the first bidirectional switch branch road S1, and the 3rd single-way switch S21, the 4th single-way switch S22, buffer circuit C2 and fuse M2 form the second bidirectional switch branch road S2.Acting as of described buffer circuit: bidirectional switch disconnects moment, in current circuit, inductance department branch forms overvoltage, and buffer circuit now plays a protective role to bidirectional switch branch road.Acting as of described fuse: in the time that bidirectional switch branch trouble result is short circuit, switches fuse if continue and can fuse to avoid short circuit in winding, complete after this switching, fault-signal is uploaded to host computer by control loop, and quiescing.In the time that bidirectional switch branch trouble result is open circuit, will cause load open circuit, after the detecting unit in control loop calculates, can identify this fault, and forbid continuing operation.With the process taking Fig. 4 as example, if when open fault appears in S21, under 4c state, S21 is applied in after triggering signal, because S21 opens a way, so the second bidirectional switch branch road S2 remains disconnection, switching is proceeded, and the first bidirectional switch S1 will turn-off, now can cause load open circuit, at S2 two ends, uS2 moment increases, and forms overvoltage, as Fault Identification signal; If S22 short circuit and now i<0, in the moment that switches to 4b, step voltage, through fixed contact R1A, leads directly to contact K, and the second bidirectional switch branch road S2 and fixed contact R2A form path, now, winding is equivalent to short circuit, and the current i K moment of described straight-through contact K increases, and forms overcurrent, as Fault Identification signal, all the other Fault Identification signals similarly.
Described electronic power switch forward can bear high voltage, does not oppositely bear voltage, and diode of inverse parallel with it forms single-way switch, and two single-way switch anti-series are formed to bidirectional switch.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, and in the time not applying triggering signal, two single-way switch are all in off state, and this bidirectional switch branch road 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 this single-way switch 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 bidirectional switch branch road 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 bidirectional switch branch road is in on-state.
Described in the present embodiment, a kind of transformer integral type also comprises one group of fixed contact being connected with transformer tapping without arc on load tap changer, two other moving contact D2, D3 and control power subsystem; Described two groups of fixed contacts are respectively A group fixed contact and B group fixed contact.Described A group fixed contact comprises the fixed contacts such as R1A, R2A, R3A, and B group fixed contact comprises the fixed contacts such as R1B, R2B, R3B.The fixed contact that described moving contact D2, D3 are adjacent with two of described B group fixed contact is connected, simultaneously for controlling power subsystem power supply.The fixed contacts such as A group fixed contact R1A, R2A along with the movement of moving contact D1 be positioned at the first bidirectional switch branch road S1 on moving contact, straight-through contact K and the second bidirectional switch branch road S2 and be connected successively, described contact D2 organizes the fixed contacts such as R1B, R2B, R3B and is connected successively in moving process with B with D3.
Fig. 2 be a kind of transformer integral type of a preferred embodiment of the present invention without the structural representation of the control loop of arc on load tap changer, described control loop comprises trigger element and detecting unit; Described detecting unit detects the pressure drop U between electric current and pressure drop iS1, iS2, uS1, uS2 and moving contact D2, the D3 of the current i that described outlet terminal flows through, straight-through contact current i K, described the first bidirectional switch branch road, the second bidirectional switch branch road
0, and the data that obtain are calculated to backward described trigger element issue control command, provide triggering signal by described trigger element for the electronic power switch of described the first bidirectional switch branch road, the second bidirectional switch branch road.Described control loop also comprises power supply, communication unit and electric-motor drive unit, and described power supply is the power supply of control loop each several part; Described communication unit comprises the first communication unit, the second communication unit, the 3rd communication unit; The first communication unit is used for carrying out communication with host computer, the data of uploading detection unit inspection, and receive the control command of transferring the files that host computer issues; The second communication unit is for the data of the 3rd communication unit uploading detection unit inspection; Electric-motor drive unit, for moving contact D1, D2, D3 are controlled, moves to destination locations; Described trigger element sends triggering signal according to detecting unit the electronic power switch of bidirectional switch branch road is carried out to sequencing control, realizes the commutating without arcing of on load tap changer.Described detecting unit detects the operating state of bidirectional switch branch road, sends fault-signal, and stop handoff procedure while having fault by the 3rd communication unit to host computer.
Fig. 3 is that a kind of transformer integral type of a preferred embodiment of the present invention is without the structural representation of the control power subsystem of arc on load tap changer; Described control power subsystem comprises two states, and when the second moving contact D2 and the 3rd moving contact D3 are during in the first state, input stage voltage is U
0, output U
dC0for 24V direct voltage, it is control loop power supply.Step voltage is converted to direct current by isolation and the translation circuit of controlling power subsystem inside, 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 conversion device can adopt power frequency isolation or high-frequency isolation power technology, high-frequency isolation technology is isolated small volume with respect to power frequency, is easy to install.Direct current after conversion, through charging module, by discharge module at output is exported 24V direct current when charging for energy-accumulating medium, and wherein energy-accumulating medium can adopt ultracapacitor or storage battery.When moving contact D2 and moving contact D3 are in handoff procedure during in the second state, the input stage voltage of controlling power module is zero, and energy-accumulating medium electric discharge at output output 24V direct current, has ensured the reliable power supply of control loop by discharge module.
Below the handoff procedure of moving contact D1 is described:
Moving contact D1 switches to R2A by A group fixed contact R1A, moving contact D2 switches to R2B, moving contact D3 by B group fixed contact R1B and switches to R3B by B group fixed contact R2B simultaneously, or, A group fixed contact R2A switches to R1A, and moving contact D2 switches to R1B, moving contact D3 by B group fixed contact R2B and switches to R2B by B group fixed contact R3B.Be connected with A group fixed contact R1A if lead directly to contact K when stable state in moving contact D1, load current is organized fixed contact R1A through winding end of incoming cables L, winding, A, and is connected to outlet terminal N through straight-through moving contact K, thus formation current path.Moving contact D2 is connected with B group fixed contact R1B, and moving contact D3 is connected with B group fixed contact R2B, provides voltage for controlling power subsystem input.Suppose now to receive host computer instruction, on load tap changer is switched to R2A by A group fixed contact R1A, and the moving process of moving contact D1 is as Fig. 4 a-4e, and the moving process of the second moving contact D2 and the 3rd moving contact D3 is as Fig. 5 a-5c, in order to simplify, only express diverter switch part herein.
When straight-through contact K moves to fixed contact R2A position by fixed contact R1A, mechanical action is a continuous process, and the time used is the millisecond order of magnitude.In this moving process, the 3rd single-way switch S21 of the first single-way switch S11 of the first bidirectional switch branch road S1 and the second single-way switch S12 and the second bidirectional switch branch road S2 and the 4th single-way switch S22 coordinate by certain sequential, realize by fixed contact R1 the commutating without arcing to fixed contact R2, in microsecond magnitude, can complete switching completely the switching time of electronic switch in Mechanical Moving process.
In the present invention, electric handoff procedure must be controlled the disconnected of bidirectional switch and closes in the time of the different shift position of mechanical process, and the disconnected process of closing must be according to certain sequential, to avoid load open circuit or short circuit in winding.
As Fig. 4 a, only getting adjacent two fixed contact R1A, R2A is herein example, and other handoff procedure analyses are identical with it.Straight-through contact K is connected with one end of fixed contact R1A, and the first bidirectional switch branch road S1 is not connected with fixed contact R1A and fixed contact R2A with the second bidirectional switch branch road S2, and now all four electronic power switches are all in off state.Detecting unit detects the direction of the current i K of straight-through contact K, detects voltage uS1 and the uS2 that bear at the first bidirectional switch branch road S1 and the second bidirectional switch branch road S2 two ends, if detect that S2 bears step voltage U mobile time
0, moving contact is to be switched to R2A by fixed contact R1A, then triggers the road of single-way switch according to the direction of iK, described detecting unit detects the current i K of straight-through contact K, in the time of iK>0, trigger the first single-way switch S11, make the first bidirectional switch branch road S1 conducting; In the time of iK<0, trigger the second single-way switch S12, make the first bidirectional switch branch road S1 conducting; Now straight-through contact K is connected with fixed contact R1A, and because straight-through contact K resistance is little, although the first single-way switch S11 and the second single-way switch S12 conducting, load current still flows through from straight-through moving contact K.If detect that S1 bears step voltage U0, moving contact is switched to R1A by fixed contact R2A, trigger single-way switch according to the direction of iK, described detecting unit detects the current i K of straight-through contact K, in the time of iK>0, trigger the 3rd single-way switch S21, make the second bidirectional switch branch road S2 conducting; In the time of iK<0, trigger the second single-way switch S22, make the second bidirectional switch branch road S2 conducting.
Along with moving contact, D1 moves, in the time moving to Fig. 4 c position, the first bidirectional switch branch road S1 is connected respectively fixed contact R1A and fixed contact R2A with the second bidirectional switch branch road S2, it is now the key link of diverter switch action, realize the commutating without arcing of tapping at this, and avoid load open circuit or short circuit in winding.By Fig. 4 b state, in the moving process of Fig. 4 c state, in the time that the second bidirectional switch branch road S2 is not connected with fixed contact R2A, because the second bidirectional switch branch road S2 is in floating dummy status, switching voltage reduces to zero; In the time that moving contact D1 moves to Fig. 4 c state, because the second bidirectional switch branch road S2 is in off-state, must bear the winding step voltage U between fixed contact R1A and R2A
0, by judging whether the second bidirectional switch branch road S2 two ends bear the criterion that voltage is connected with fixed contact R2A as the second bidirectional switch branch road S2, thereby saved mechanical location decision mechanism.In the time that detecting unit in control loop detects that the second bidirectional switch branch road S2 bears voltage, start the handoff procedure to the second bidirectional switch branch road S2 by the first bidirectional switch branch road S1, need the bearing data of load current, if electric current flows to the first moving contact D1 for just from A group fixed contact, be current i >0, on the contrary i<0.According to load current direction and diverter switch direction, switch to the second bidirectional switch branch road S2 or switch to the first bidirectional switch branch road S2 by the second bidirectional switch branch road S2 by the first bidirectional switch branch road S1, have 4 kinds of operating modes, as shown in Fig. 6 a-6d.
Fig. 6 a and Fig. 6 b represent the handoff procedure to the second bidirectional switch branch road S2 by the first bidirectional switch branch road S1, Fig. 6 c and Fig. 6 d represent the handoff procedure to the first bidirectional switch branch road S1 by the second bidirectional switch branch road S2, explain this handoff procedure below as an example of Fig. 6 a example, this operating mode is current i >0, and by tangential the second bidirectional switch branch road S2 of the first bidirectional switch branch road S1.
When moving contact D is during in position shown in Fig. 4 c, the first single-way switch S11 and the second single-way switch S12 are conductings, now the second bidirectional switch branch road S2 bears step voltage U0, 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. 6 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 second single-way switch S12 reliable turn-off; 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, moving contact D1 continues mobile, when the first bidirectional switch branch road S1 and fixed contact R1A 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 moving contact D1 moves to as Fig. 4 d position, straight-through contact K is all connected with fixed contact R2A with the second bidirectional switch branch road S2, because the resistance that leads directly to contact K is much smaller than the second bidirectional switch branch road S2, current transfer is to straight-through contact K, when the second bidirectional switch branch road S2 current i being detected
s2be decreased to and approach at 1 o'clock, can judge that straight-through contact is communicated with in fixed contact R2A, now issues triggering signal by trigger element and turn-offs the second bidirectional switch branch road S2 suddenly.
When moving contact D moves to Fig. 4 e position, the first bidirectional switch branch road S1 and the second bidirectional switch branch road S2 and fixed contact R1A and fixed contact R2A disconnect, and only have straight-through contact K to be connected with fixed contact R2A, 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 6b-6d, no longer repeats.
Fig. 5 is the moving process of moving contact D2 and moving contact D3, same drive motors drives three moving contacts to move simultaneously, and initial condition is that contact D2 is connected with fixed contact R1B, and moving contact D3 is connected with fixed contact R2B, as shown in Figure 5 a, now-control power subsystem input input stage voltage U
0in the time switching to Fig. 5 b state, the second moving contact D2 is not all connected with any fixed contact with the 3rd moving contact D3, now control power subsystem input without input, use inner energy storage medium discharge, for control loop provides power supply, in the time that moving contact D1 switches to Fig. 4 e state, moving contact D2 and moving contact D3 switch to Fig. 5 c state, now control power subsystem input input stage voltage U
0, so far, a handoff procedure of moving contact D2 and moving contact D3 all completes.
A kind of transformer integral type that Fig. 7 is a preferred embodiment of the present invention is without the stereogram of arc on load tap changer, upper strata is B group fixed contact, moving contact D2 and moving contact D3 and controls power subsystem part, lower floor is A group fixed contact and moving contact D1 part, and diverter switch drive motors drives three moving contacts to switch simultaneously.
The work schedule when employing providing according to above-described embodiment Fig. 6 b-6d is controlled device entirely, the control sequential while can Analogy going out to adopt half control device, no longer repeats.
Said process 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.
The above is only embodiments of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
The present invention is by using bidirectional switch and the triggering sequencing control to bidirectional switch, realize the commutating without arcing of on load tap changer, prevent from causing fault spread when bidirectional switch from breaking down, ensured the reliable power supply of control loop, 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 (10)
1. transformer integral type is without an arc on load tap changer, comprise the fixed contact that is connected with transformer tapping, be connected with transformer terminal by motor-driven moving contact, it is characterized in that, also comprise control loop;
Described moving contact comprises the first bidirectional switch branch road, straight-through contact, the second bidirectional switch branch road that one end is connected with outlet terminal; After described the first switching branches and the second bidirectional switch branch road are connected by two electronic power switches, a buffer circuit in parallel, then be in series with a fuse;
Described control loop comprises trigger element and detecting unit; Described detecting unit detects electric current, the electric current of described straight-through contact, described the first bidirectional switch branch road, the electric current of the second bidirectional switch branch road and the pressure drop of pressure drop and adjacent two fixed contacts that described outlet terminal flows through, and the data that obtain are calculated to backward described trigger element issue control command, provide triggering signal by described trigger element for the electronic power switch of described the first bidirectional switch branch road, the second bidirectional switch branch road.
2. a kind of transformer integral type according to claim 1, without arc on load tap changer, is characterized in that, parallel connection buffer circuit between described the first bidirectional switch branch road and the second bidirectional switch branch road.
3. a kind of transformer integral type according to claim 1 and 2, without arc on load tap changer, is characterized in that, described buffer circuit is an electric capacity or resistance-capacitance circuit.
4. a kind of transformer integral type according to claim 1 is without arc on load tap changer, it is characterized in that, in moving contact moving process, described the first bidirectional switch branch road, straight-through contact, the second bidirectional switch branch road successively with being connected of described each fixed contact.
5. a kind of transformer integral type according to claim 1 is without arc on load tap changer, it is characterized in that, also comprise control power subsystem, described control power subsystem is made input stage voltage with the pressure drop of described adjacent two fixed contacts, and is described control loop power supply.
6. a kind of transformer integral type according to claim 5 is without arc on load tap changer, it is characterized in that, also comprise other one group of fixed contact being connected with transformer tapping, the pressure drop of wherein two adjacent fixed contacts of described other one group of fixed contact is described control power subsystem power supply.
7. a kind of transformer integral type according to claim 1 is without arc on load tap changer, it is characterized in that, described control loop also comprises communication unit and electric-motor drive unit, the data upload described detecting unit being detected by described communication unit is to host computer, by described PC control drive motor units, drive described moving contact action.
8. a kind of transformer integral type according to claim 1 is without arc on load tap changer, it is characterized in that, described control power subsystem is converted to direct voltage by isolation and the translation circuit of its inside by the step voltage of input, be described control loop power supply by discharge module, be its inner charging module charging simultaneously; The input stage voltage of described control power subsystem is 1 o'clock, is that described charging module is described control loop power supply by described discharge module.
9. a kind of transformer integral type according to claim 1, without arc on load tap changer, is characterized in that, described electronic power switch adopts the half control device of thyristor or the full control device of IGBT, MOSFET.
10. a kind of transformer integral type according to claim 9, without arc on load tap changer, is characterized in that, 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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| CN201410329061.2A CN104157491B (en) | 2014-07-11 | 2014-07-11 | A kind of transformer integral type is without arc load ratio bridging switch |
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| CN201410329061.2A CN104157491B (en) | 2014-07-11 | 2014-07-11 | A kind of transformer integral type is without arc load ratio bridging switch |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110518845A (en) * | 2019-07-30 | 2019-11-29 | 广州供电局有限公司 | On-load tap-changer of transformer |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2424766B (en) * | 2005-03-31 | 2007-06-27 | Areva T & D Sa | An on-load tap changer |
| CN101048932A (en) * | 2004-11-12 | 2007-10-03 | 罗姆股份有限公司 | Direct-current-to-alternating current converter, controller IC therefor, and parallel operation system for direct-current-to-alternating current converter |
| CN101325124A (en) * | 2008-04-24 | 2008-12-17 | 中国农业大学 | Tapping switch for load voltage-regulating transformer and voltage-regulating transformer using the same |
| CN101996752A (en) * | 2010-09-19 | 2011-03-30 | 中国农业大学 | Transformer split-type arcless on-load tap switch |
-
2014
- 2014-07-11 CN CN201410329061.2A patent/CN104157491B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101048932A (en) * | 2004-11-12 | 2007-10-03 | 罗姆股份有限公司 | Direct-current-to-alternating current converter, controller IC therefor, and parallel operation system for direct-current-to-alternating current converter |
| GB2424766B (en) * | 2005-03-31 | 2007-06-27 | Areva T & D Sa | An on-load tap changer |
| CN101325124A (en) * | 2008-04-24 | 2008-12-17 | 中国农业大学 | Tapping switch for load voltage-regulating transformer and voltage-regulating transformer using the same |
| CN101996752A (en) * | 2010-09-19 | 2011-03-30 | 中国农业大学 | Transformer split-type arcless on-load tap switch |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110518845A (en) * | 2019-07-30 | 2019-11-29 | 广州供电局有限公司 | On-load tap-changer of transformer |
| 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 |
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|---|---|
| CN104157491B (en) | 2018-02-27 |
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