CN210469152U - On-load voltage regulation circuit with polarity conversion for staggered parallel nine-gear transformer - Google Patents
On-load voltage regulation circuit with polarity conversion for staggered parallel nine-gear transformer Download PDFInfo
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- CN210469152U CN210469152U CN201921100520.4U CN201921100520U CN210469152U CN 210469152 U CN210469152 U CN 210469152U CN 201921100520 U CN201921100520 U CN 201921100520U CN 210469152 U CN210469152 U CN 210469152U
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Abstract
The utility model relates to the field of distribution transformers, and provides an on-load voltage regulation circuit with a polarity-switching staggered parallel nine-gear transformer, which comprises a main winding, a polarity-switching switch, a voltage regulation winding, a transition switching unit, a rated voltage branch and five voltage regulation branches; the utility model arranges a polarity change-over switch between the main winding and the voltage regulating winding, and realizes positive and negative voltage regulation by adjusting the independent contact switch-on end of the polarity change-over switch; one end of each voltage regulating branch is respectively connected to two end taps of the voltage regulating winding and each middle tap; and the other ends of the two groups of the three-phase alternating current transformer are adjacently connected in parallel in a staggered mode to form two groups and respectively connected with two input ends of the transition switching unit, the input end of the rated voltage branch is connected with a tap of the output end of the main winding, and the output end of the rated voltage branch is connected with the output end of the voltage regulating circuit. The beneficial effects of the utility model are that reduce on-off switch's break-make frequency, increase corresponding regulating switch's life and need not to jump the shelves pressure regulating.
Description
Technical Field
The utility model relates to a distribution transformer field particularly relates to an on-load voltage regulating circuit of transformer.
Background
Under application number 201610121960, entitled: the patent of 'a permanent magnet vacuum on-load tap changer, a transformer and an on-load tap changing method' provides an on-load tap changing method which applies two vacuum arc extinguishing chambers to respectively form a main loop and a transition loop structure. The technical scheme is as follows: when the circuit normally operates, the main loop vacuum arc-extinguishing chamber is switched on, the main loop is in a switching-on state, the transition loop vacuum arc-extinguishing chamber is switched off, the transition loop is in a switching-off state, and the voltage regulating winding connected into the main loop determines the external voltage supply gear of the circuit. When the gears are switched, the transition loop vacuum arc-extinguishing chamber is closed firstly, the transition loop is in a connected state, then the main loop vacuum arc-extinguishing chamber is disconnected, and the main loop is in a disconnected state. At this time, the gearshift switch completes the gearshift without current, and no arc is generated. The transition loop provides transition voltage for the circuit when the gear is switched, and the circuit is ensured not to interrupt the external voltage supply. However, the multi-gear voltage regulating circuit designed according to the scheme has the following defects:
1. the main loop vacuum arc extinguish chamber is opened and closed once and the transition loop is also closed and opened once when the gears are switched once every time. The main loop and the transition loop vacuum arc-extinguishing chamber are used as the devices with the highest on-off frequency in the circuit, and the upper limit of the on-off times of the main loop and the transition loop vacuum arc-extinguishing chamber determines the service life of the voltage regulating switch designed according to the circuit. According to the standard requirement, the mechanical life of the on-load voltage regulating switch reaches 50 ten thousand times, namely, the voltage regulating switch carries out 50 ten thousand times of tapping conversion operation under the condition that the contact is not electrified and the whole tapping range is used. According to the voltage regulating circuit, the on-load voltage regulating switches with 5 gears perform one voltage regulating cycle, and the main loop and the transition loop act for 4 x 50=200 ten thousand times. For the on-load tap changer with 9 gears, the main loop and the transition loop are required to act 8 x 50=400 ten thousand times. The mechanical service life of the vacuum arc-extinguishing chamber is required to be 80-120 ten thousand times at the present stage. Therefore, the mechanical life of the voltage regulating switch produced according to the voltage regulating circuit is a severe test, and the deduction is not up to the mechanical life required by the standard.
2. The transition loop is fixedly connected to a tap, and the pressure regulation of any gear needs to return to the fixed tap first and then to the gear needing pressure regulation, commonly called gear skipping pressure regulation. The transient change of the voltage can generate an operation overvoltage with very high amplitude, and the higher the transient change rate of the voltage is, the higher the amplitude of the generated overvoltage is, so that the damage to electronic products in a power grid is great. The standard is not to allow for trip voltage regulation.
The application numbers are: 201721680735.9, the name is: in the patent of "a method for voltage regulation on load using a double throw switch", an improvement is made to the patent 201610121960: the structure of the tapping coil is simpler; the transition loop is connected to the rated gear instead of the main winding end of the transformer, so that the voltage fluctuation is small when the gear is shifted. There are several variations of this patent. But the two fundamental points are the same as patent 201610121960: 1. when the gear is switched once, the vacuum arc extinguish chamber of the main loop needs to be opened and closed once, and the transition loop needs to be opened and closed once. The upper limit of the on-off times of the voltage regulating switch determines the service life of the voltage regulating switch designed according to the circuit. 2. The transition circuit is fixedly connected with a tap of the main winding, and the trip voltage regulation is still performed during voltage regulation, which is not allowed by the standard.
In patent No. 201820286271.1, 201721680735.9 is modified to add transition circuit selection switches (the number of the transition circuit selection switches is changed according to the different voltage regulating gears, and 2 transition circuit selection switches are needed in 5 gears). The transition loop is not fixedly connected to the main connection gear of the voltage regulating winding, but changes along with the change of the gear through the transition loop selection switch. However, each time the gear is switched, the vacuum arc-extinguishing chamber of the main loop needs to be opened and closed once, and the transition loop needs to be opened and closed once. The defect that the service life of the voltage regulating switch designed according to the circuit is determined by the upper limit of the on-off times of the voltage regulating switch is still not changed. And with the increase of the number of switch gears, the number of selection switches of the transition circuit also increases, and the switch structure tends to be complex.
SUMMERY OF THE UTILITY MODEL
The utility model aims at designing a new on-load voltage regulating circuit of a nine-gear transformer, replacing the design of a transition loop and a main loop, reducing the on-off frequency of an on-off switch in the circuit in the voltage regulating process, so as to achieve the purpose of prolonging the service life of the corresponding voltage regulating switch; in the voltage regulating process, the transition voltage is different along with different gear positions switched by the circuit, so that the voltage fluctuation in voltage regulation is reduced, and the problem of gear skipping voltage regulation is solved; meanwhile, the positive and negative voltage regulation functions are added into the nine-gear voltage regulation circuit, so that the purposes of reducing the number of voltage regulation windings and reducing the manufacturing cost on the premise of the same gear are achieved.
In order to realize the purpose of the utility model, the technical scheme of the utility model is an on-load voltage regulating circuit of a staggered parallel nine-gear transformer with polarity conversion, which comprises a main winding, a voltage regulating winding, a rated voltage branch, a transition switching unit and five voltage regulating branches; the voltage regulating winding is formed by sequentially connecting four sections of voltage regulating coils wound in the same direction end to end, the voltage regulating winding comprises two end taps and three middle taps, the tap at the input end of the main winding is connected with the input end of the voltage regulating circuit, and the tap at the output end of the main winding is connected with a common contact of the polarity change-over switch; two independent contacts of the polarity conversion switch are respectively connected with two end taps of the voltage regulating winding; the transition switching unit is formed by connecting a transition resistor and an on-off switch in parallel, a first input end and a second input end of the transition switching unit are determined at two ends of the parallel structure, and the second input end is also used as an output end of the voltage regulating circuit. Preferably, the switch is a vacuum interrupter, the arc does not contaminate the transformer oil. Each voltage regulating branch is connected with an on-off switch in series, and one end of each voltage regulating branch is connected to two end taps and a middle tap of the voltage regulating coil respectively; and the other ends of the two groups of the three-phase transformer are adjacently, alternately and parallelly connected into two groups and respectively connected with the two input ends of the transition switching unit, preferably, the vacuum arc-extinguishing chamber is used for a switch, and electric arcs cannot pollute transformer oil. The rated voltage branch is connected with an on-off switch in series, and one end of the rated voltage branch is connected with the output end of the main winding (the common contact of the polarity conversion switch is also connected with the end); the other end may be connected to either end of the transitional switching unit. Preferably, the rated voltage branch is connected to the first input end of the transition switching unit, and the output current does not pass through a switch in the transition switching unit during rated gear; the on-off switch preferably uses a vacuum arc-extinguishing chamber, and electric arcs cannot pollute transformer oil.
Specifically, four sections of voltage regulating coils are connected end to end, two ends of each voltage regulating coil are respectively provided with a voltage regulating winding tap, adjacent voltage regulating coil ends share one voltage regulating winding tap, and the voltage regulating windings have five taps, namely an upper tap, a middle-lower tap and a lower tap.
One end of the five voltage regulating branches is respectively connected with a winding tap, and the other end of each voltage regulating branch has two connection modes:
the first connection mode is as follows: the other ends of the three voltage regulating branches are directly connected with a second input end of the transition switching unit; the voltage regulating branch circuit is connected with the middle upper end tap and the voltage regulating branch circuit is connected with the middle lower end tap, and the other ends of the two voltage regulating branch circuits are connected with the first input end of the transition switching unit.
And a second connection mode: the voltage regulating branch circuit is connected with the upper end tap, the voltage regulating branch circuit is connected with the middle end tap, and the voltage regulating branch circuit is connected with the lower end tap, and the other ends of the three voltage regulating branch circuits are connected with a first input end of the transition switching unit; the other ends of the two voltage regulating branches are connected with a second input end of the transition switching unit.
Because the second input of transition switching unit is connected with whole voltage regulating circuit's output, so the voltage regulating branch road of the second input of definition connection transition switching unit directly links the voltage regulating branch road, because it has a resistance and transition unit on-off switch that connect in parallel to establish ties between the first input of transition switching unit and the output of voltage regulating circuit, so the voltage regulating branch road of the first input of definition connection transition switching unit is the non-directly links voltage regulating branch road.
The polarity conversion switch is in an upper end connection state, the polarity of a voltage regulating winding of the access circuit is the same as that of the main winding, and the circuit can perform positive voltage regulation; the polarity conversion switch is in a lower end connection state, the polarity of a voltage regulating winding of the access circuit is opposite to that of the main winding, and the circuit can perform reverse voltage regulation.
In the positive voltage regulation process or the negative voltage regulation process, the voltage regulation winding of the access circuit can be regulated by independently closing the on-off switch of any voltage regulation branch circuit, and the on-off switch corresponds to different gears.
And the on-off switch of any non-direct-connected voltage regulating branch is in a closed state, and meanwhile, the on-off switch of the transition switching unit is also in an on state, so that the voltage regulating circuit is in a normal operation state of a corresponding gear at the moment, and the state is defined as a normal working state of the non-direct-connected circuit.
The on-off switch of the direct-connection voltage-regulating branch is in a closed state, the on-off switch of the transition switching unit is in an off state, the voltage-regulating circuit is in a normal running state of a corresponding gear at the moment, and the state is defined as a normal working state of the direct-connection circuit.
In the process of gear switching, the on-load voltage regulation is realized by matching with a structure that a direct-connected voltage regulation branch circuit and a non-direct-connected voltage regulation branch circuit are alternated.
From circuit structure, the technical scheme of the utility model, a pressure regulating branch road is for directly linking the pressure regulating branch road, and adjacent pressure regulating branch road must be for the non-directly links pressure regulating branch road with it. In the multi-gear transformer voltage regulating circuit under the scheme, all voltage regulating branches are necessarily connected in the alternative form.
The voltage regulating circuit under the technical scheme is switched from the normal working state of one voltage regulating branch circuit to the normal working state of the other voltage regulating branch circuit adjacent to the voltage regulating branch circuit in a gear switching mode. Or the normal working state of the direct connection voltage regulating branch circuit is switched to the normal working state of the non-direct connection voltage regulating branch circuit, or the normal working state of the non-direct connection voltage regulating branch circuit is switched to the normal working state of the direct connection voltage regulating branch circuit.
From the circuit structure, as long as the on-off switch of the transition switching unit is in an off state, the transition resistor is always connected in series between the two adjacent voltage regulating branches, so that the circuit is prevented from being short-circuited when the two adjacent voltage regulating branches are simultaneously in an on state, the two voltage regulating branches are allowed to be simultaneously in an on state, and the power supply is prevented from being interrupted in the voltage regulating process.
Therefore, as long as the on-off switch of the transition switching unit is in an off state, the voltage regulation can be started.
If from directly connecting the normal operating condition of pressure regulating branch road and switching to the normal operating condition of non-directly connecting pressure regulating branch road, because directly connecting the pressure regulating branch road and being in normal operating condition, transition switching unit on-off switch has been in the off-state this moment, so as long as the closure corresponds non-directly connecting pressure regulating branch road on-off switch, then the disconnection corresponds directly connecting pressure regulating branch road on-off switch, then switch on transition switching unit on-off switch, so then accomplish a gear and switch over.
If the normal working state of the non-direct-connection voltage-regulating branch is switched to the normal working state of the direct-connection voltage-regulating branch from the normal working state of the non-direct-connection voltage-regulating branch, the on-off switch of the transition switching unit is in the on state because the non-direct-connection branch is in the normal working state, the on-off switch of the transition switching unit is firstly switched off, then the on-off switch of the corresponding direct-connection voltage-regulating branch is switched on, and then the on-off switch.
Therefore the technical scheme of the utility model, it is not only on connected mode, as long as each pressure regulating branch road satisfies directly link with the mode of non-direct link alternate connection, can realize the same technological effect. The two connection modes can be regarded as two preferable embodiments under the same utility model.
Therefore use the utility model discloses a transformer, the gear is once switched, and transition switching unit break-make switch only experiences once opening or once closing. The gear is switched twice continuously, and the on-off switch of the transition switching unit is switched on and off once. In the prior art, each time the gears are switched, the vacuum arc-extinguishing chambers of the main loop transition loop are opened and closed once respectively.
Compared with the prior art, the technical scheme can reduce half of opening and closing times of the vacuum arc-extinguishing chamber on the premise of the same voltage regulation times. On the other hand, the utility model discloses technical scheme can let the pressure regulating branch road of previous gear provide the transition voltage for the pressure regulating branch road of adjacent gear, so the transition voltage can be along with the difference of pressure regulating gear always, and change thereupon.
Besides the positive voltage regulation and the negative voltage regulation, the switch from the positive voltage regulation to the negative voltage regulation or the switch from the negative voltage regulation to the positive voltage regulation is also provided. In the switching process, the polarity conversion switch is switched from the upper end to the on state, the lower end is switched on or from the lower end to the upper end, and each voltage regulating branch is necessarily in the off state in the switching process, so that the transition voltage cannot be provided for the voltage regulating circuit.
The rated voltage branch bypasses the polarity change-over switch and is directly connected between the main winding tap and the output end of the voltage regulating circuit, the on-off switch of the rated voltage branch is closed, and the rated voltage branch is in a switch-on state, so that the circuit can be ensured not to interrupt voltage supply when positive and negative voltage regulation is switched.
Preferably, the transition switching unit is formed by connecting a transition resistor and an on-off switch in parallel, a first input end of the transition switching unit is connected with a first end of the transition resistor and a first end of the on-off switch, a second input end of the transition switching unit is also used as an output end of the transition switching unit, and an output end of the transition switching unit is connected with a second end of the transition resistor and a second end of the on-off switch.
Preferably, the on-off switch of the transition switching unit adopts a vacuum arc-extinguishing chamber.
Preferably, the on-off switches connected in series on the voltage regulating branch and the rated voltage branch adopt vacuum arc-extinguishing chambers.
Alternatively, a second vacuum arc-extinguishing chamber is connected in series with a line from the second input end to the output end in the transition switching unit, a third vacuum arc-extinguishing chamber is connected in series with a line from the first input end to the output end through a transition resistor, and meanwhile, the on-off switches respectively connected in series with the voltage regulating branch and the rated voltage branch are both common on-off switches.
To sum up, the foundation the utility model discloses the transformer that technical scheme designed has that voltage fluctuation is little, the output voltage high quality is halved with gear voltage regulation winding figure when long service life, vary voltage, low in manufacturing cost's advantage.
In the present invention, the input terminal and the output terminal are defined for clearly expressing the connection relationship of the constituent parts of the circuit, wherein "input" and "output" are used only for distinguishing different connection terminals, and do not represent the flowing or transmitting direction of the current or signal.
Drawings
FIG. 1 is an on-load tap changer for a nine-speed transformer;
fig. 2 shows an alternative connection of the on-load tap changing circuit of a nine-speed transformer.
Detailed Description
The structure characteristics and the working principle of the voltage regulating circuit of the nine-gear transformer with polarity conversion according to the present invention will be further described with reference to the accompanying drawings.
The utility model discloses a nine grades of transformer voltage regulating circuit schematic diagrams under the technical scheme is shown with reference to fig. 1, this circuit comprises main winding, voltage regulating winding, rated voltage branch road, transition switching unit, five voltage regulating branch roads.
The transition switching unit comprises a first input terminal T1, a second input terminal T2, an output terminal Xb and a parallel structure of a vacuum arc extinguish chamber D0 and a transition resistor R which are connected between the first input terminal T1 and the output terminal Xb in series.
The first voltage regulating coil L1, the second voltage regulating coil L2, the third voltage regulating coil L3 and the fourth voltage regulating coil L4 are connected end to form a voltage regulating winding, two ends of the voltage regulating coil are respectively provided with a winding tap, adjacent voltage regulating coils share one winding tap, and the four voltage regulating coils are provided with five voltage regulating winding taps, namely an upper end tap X1, a middle upper end tap X2, a middle end tap X3, a middle lower end tap X4 and a lower end tap X5.
And a common contact of the polarity change-over switch KaKb is connected with a tap Xa at the output end of the main winding, and two independent contacts of the polarity change-over switch are respectively connected with an upper tap X1 and a lower tap X5 of the voltage regulating winding.
The on-off switch D1, the on-off switch D2, the on-off switch D3, the on-off switch D4, the on-off switch D5, and the on-off switch Ke are all vacuum interrupters.
And one end of the on-off switch D1 is connected with an upper end tap X1, and the other end of the on-off switch D1 is connected with a second input end T1 of the transition switching unit and exists as a voltage regulating branch.
And one end of the on-off switch D2 is connected with the upper end tap X2, the other end of the on-off switch is connected with the first input end T1 of the transition switching unit, and the on-off switch is connected with the output end Xb of the voltage regulating circuit through a parallel structure of the vacuum arc-extinguishing chamber D0 and the resistor R and exists as a voltage regulating branch.
And one end of the on-off switch D3 is connected with a middle-end tap X3, and the other end of the on-off switch D3 is connected with a second input end T2 of the transition switching unit and exists as a voltage regulating branch.
And one end of the on-off switch D4 is connected with a middle lower end tap X4, the other end of the on-off switch is connected with a first input end T1 of the transition switching unit, and the on-off switch is connected with an output end Xb of the voltage regulating circuit through a parallel structure of a vacuum arc-extinguishing chamber D0 and a resistor R and exists as a voltage regulating branch.
And one end of the on-off switch D5 is connected with a lower end tap X5, the other end of the on-off switch is connected with a first input end T1 of the transition switching unit, and the on-off switch is connected with an output end Xb of the voltage regulating circuit through a parallel structure of a vacuum arc-extinguishing chamber D0 and a resistor R and exists as a voltage regulating branch.
The combination state of the polarity switch and each on-off switch corresponds to each gear of the voltage regulating circuit as follows:
1, gear 1: ka-close D5-close D0 open-circuit voltage-regulating windings L1, L2, L3 and L4 are connected into the circuit
2, gear: ka-in D4-in D0-in voltage-regulating windings L1, L2 and L3 are positively connected into a circuit
3, gear 3: ka closes D3 closes D0 and opens the positive access circuit of voltage regulating winding L1, L2
4, gear 4: ka closes D2 and D0 closes voltage regulating winding L1 positive access circuit
5, gear: ka closes D1 closes D0 and opens regulating winding L1, L2, L3, L4 and do not insert the circuit all
5, gear: kb closes D5 closes D0 and opens regulating winding L1, L2, L3, L4 and do not insert the circuit all
6, gear 6: kb and D4 and D0 voltage regulating winding L1 reverse access circuit
7, gear: kb closes D3 closes D0 and opens voltage regulating winding L2, L1 and inserts the circuit conversely
And 8, gear: kb and D2 and D0 voltage-regulating windings L3, L2 and L1 are reversely connected into a circuit
9, gear: kb closes D1 closes D0 and opens regulating winding L4, L3, L2, L1 and inserts the circuit conversely
Note: ka indicates that the Ka terminal of the polarity switch is in an on state, and Kb indicates that the Kb terminal of the bidirectional switch is in an on state.
And (3) voltage regulation principle:
when the voltage regulating circuit is in the 1 gear, the Ka end of the polarity switch is in a connected state. The on-off switch D5 is in a closed state, the vacuum arc extinguish chamber D0 of the transition switching unit is in an open state, and the voltage regulating windings L1, L2, L3 and L4 are all connected into a circuit.
And (3) closing the on-off switch D4, wherein the on-off switch D4 and the on-off switch D5 are in a closed state at the same time, and the transition resistor provides short-circuit protection. The on-off switch D5 is then opened and the transition switching unit vacuum interrupter D0 is closed, at which time the voltage regulating windings L1, L2, L3 are now connected into circuit. The circuit completes the switching from 1 gear to 2 gear.
The vacuum arc extinguish chamber D0 of the transition switching unit is disconnected firstly, then the on-off switch D3 is closed, at the moment, the on-off switch D4 and the on-off switch D3 are in a closed state at the same time, the two branches are connected with each other, and the transition resistor R protects the circuit from short circuit. The on-off switch D4 is then opened, while the regulator windings L1, L2 are now connected into circuit. The voltage regulating circuit completes the switching from 2 gear to 3 gear.
And (3) closing the on-off switch D2, wherein the on-off switch D2 and the on-off switch D3 are in a closed state at the same time, and the transition resistor provides short-circuit protection. The on-off switch D3 is then opened and the transition switching unit vacuum interrupter D0 is closed, at which time the regulator winding L1 is being switched into circuit. The circuit completes the switching from 3 gear to 4 gear.
The vacuum arc extinguish chamber D0 of the transition switching unit is firstly opened, then the on-off switch D1 is closed, at the moment, the on-off switch D1 and the on-off switch D2 are in a closed state at the same time, and the transition resistor R provides short-circuit protection. Then the on-off switch D2 is switched off, and the voltage regulating windings L1, L2, L3 and L4 are not connected into the circuit. The voltage regulating circuit completes the switching from 4 th gear to 5 th gear.
After the positive voltage regulation is finished, switching from the positive voltage regulation to the negative voltage regulation is performed. The on-off switch Ke is closed firstly, the rated voltage branch is in an on state, then the on-off switch D1 is opened, at the moment, the circuit is externally supplied with voltage by the rated voltage branch, and the polarity switch KaKb is in an uncharged state. Then the polarity switch is rotated to switch from the Ka end to the Kb end. Then the on-off switch D5 is closed, the on-off switch Ke is opened, the circuit is still at 5 grades at the moment, and the switching from positive electrode voltage regulation to reverse electrode voltage regulation is completed.
The on-off switch D4 is closed, then the on-off switch D5 is opened, then the vacuum arc extinguish chamber D0. of the transition switching unit is closed, at this time, the voltage regulating winding L4 is reversely connected into a circuit, and the voltage regulating circuit completes the switching from 5 grades to 6 grades.
The vacuum arc extinguish chamber D0 of the transition switching unit is firstly opened, then the on-off switch D3 is closed, then the on-off switch D4 is opened, at the moment, the voltage regulating windings L4 and L3 are reversely connected into the circuit, and the voltage regulating circuit completes the switching from 6 grades to 7 grades.
The on-off switch D2 is closed, then the on-off switch D3 is opened, then the vacuum arc extinguish chamber D0. of the transition switching unit is closed, the voltage regulating windings L4, L3 and L2 are reversely connected into the circuit, and the voltage regulating circuit completes switching from 7 grades to 8 grades.
The vacuum arc extinguish chamber D0 of the transition switching unit is firstly switched off, then the on-off switch D1 is switched on, then the on-off switch D2. is switched off, the voltage regulating windings L4, L3, L2 and L1 are all reversely connected into a circuit, and the voltage regulating windings are switched from 8 grades to 9 grades.
In the whole nine-gear voltage regulation process, gears are switched eight times, and if a main circuit transition circuit structure used in the background technology is applied, vacuum arc extinguishing chambers in the main circuit and the transition circuit are opened and closed eight times respectively. By applying the technical scheme of the utility model, the electronic component with the highest on-off frequency in the circuit, namely the vacuum arc extinguish chamber of the transition switching unit, only needs to be opened and closed for four times, and the on-off times is just half saved compared with the prior art.
In the positive voltage regulation process or the reverse voltage regulation process, the branch circuit of the previous gear just provides transition voltage for the branch circuit of the next gear, so that different transition voltages can be ensured according to different voltage regulation gears in the specific voltage regulation process. So the foundation the technical scheme of the utility model, corresponding nine grades of transformers have the pressure regulating undulant little, advantage that voltage stability is high.
According to the technical scheme, the positive and negative voltage regulation method is applied to the nine-gear transformer voltage regulation circuit, and compared with the prior art that the number of the voltage regulation windings is compressed to four sections, the manufacturing cost is effectively reduced.
Referring to fig. 2, a schematic diagram of a voltage regulating circuit of a nine-gear transformer in the technical scheme of the aspect is shown, and the circuit is composed of a main winding, a voltage regulating winding, a rated voltage branch, a transition switching unit and five voltage regulating branches.
The transition switching unit comprises a first input terminal T1, a second input terminal T2, an output terminal Xb and a parallel structure of a vacuum arc extinguish chamber D0 and a transition resistor R which are connected between the first input terminal T1 and the output terminal Xb in series.
The first voltage regulating coil L1, the second voltage regulating coil L2, the third voltage regulating coil L3 and the fourth voltage regulating coil L4 are connected end to form a voltage regulating winding, two ends of the voltage regulating coil are respectively provided with a voltage regulating winding tap, wherein the adjacent voltage regulating coil ends share one voltage regulating winding tap, and the four voltage regulating coils are provided with five voltage regulating winding taps, namely an upper end tap X1, a middle upper end tap X2, a middle end tap X3, a middle lower end tap X4 and a lower end tap X5.
And a common contact of the polarity change-over switch KaKb is connected with a tap Xa at the output end of the main winding, and two independent contacts of the polarity change-over switch are respectively connected with an upper tap X1 and a lower tap X5 of the voltage regulating winding.
The on-off switch D1, the on-off switch D2, the on-off switch D3, the on-off switch D4, the on-off switch D5, and the on-off switch Ke are all vacuum interrupters.
And one end of the on-off switch D1 is connected with an upper end tap X1, the other end of the on-off switch is connected with a first input end T1 of the transition switching unit, and the on-off switch is connected with an output end Xb of the voltage regulating circuit through a parallel structure of a vacuum arc-extinguishing chamber D0 and a resistor R and exists as a voltage regulating branch.
And one end of the on-off switch D2 is connected with the upper end tap X2, and the other end of the on-off switch D2 is connected with the second input end T2 of the transition switching unit and exists as a voltage regulating branch.
And one end of the on-off switch D3 is connected with a middle-end tap X3, the other end of the on-off switch is connected with a first input end T1 of the transition switching unit, and the on-off switch is connected with an output end Xb of the voltage regulating circuit through a parallel structure of a vacuum arc-extinguishing chamber D0 and a resistor R and exists as a voltage regulating branch.
And one end of the on-off switch D4 is connected with a middle-lower end tap X4, and the other end of the on-off switch D4 is connected with a second input end T2 of the transition switching unit and exists as a voltage regulating branch.
And one end of the on-off switch D5 is connected with a lower end tap X5, the other end of the on-off switch is connected with a first input end T1 of the transition switching unit, and the on-off switch is connected with an output end Xb of the voltage regulating circuit through a parallel structure of a vacuum arc-extinguishing chamber D0 and a resistor R and exists as a voltage regulating branch.
The combination state of the polarity switch and each on-off switch corresponds to each gear of the voltage regulating circuit as follows:
1, gear 1: ka-in D5-in D0-in voltage-regulating windings L1, L2, L3 and L4 are connected into a circuit
2, gear: ka closes D4 closes D0 and opens regulating winding L1, L2, L3 positive access circuit
3, gear 3: ka-closed D3-closed D0-closed voltage regulating windings L1 and L2 are positively connected into a circuit
4, gear 4: ka closes D2 closes D0 and opens regulating winding L1 and is being inserted circuit
5, gear: ka closes D1 closes D0 and closes voltage regulating winding L1, L2, L3, L4 and do not insert the circuit
5, gear: kb closes D5 closes D0 closes voltage regulating winding L1, L2, L3, L4 and do not insert the circuit
6, gear 6: kb closes D4 closes D0 and opens voltage regulating winding L4 and inserts the circuit conversely
7, gear: kb and D3 and D0 and voltage regulating windings L4 and L3 are reversely connected into a circuit
And 8, gear: kb closes D2 closes D0 and opens voltage regulating winding L4, L3, L2 reverse access circuit
9, gear: kb and D1 and D0 and voltage regulating windings L4, L3, L2 and L1 are reversely connected into a circuit
Note: ka indicates that the Ka terminal of the polarity switch is in an on state, and Kb indicates that the Kb terminal of the bidirectional switch is in an on state. And (3) voltage regulation principle:
when the voltage regulating circuit is in the 1 gear, the Ka end of the polarity switch is in a connected state. The on-off switch D5 is in the on state, the vacuum interrupter D0 of the transition switching unit is in the on state, and the voltage regulating windings L1, L2, L3 and L4 are all connected into the circuit.
The vacuum arc extinguish chamber D0 of the transition switching unit is disconnected firstly, then the on-off switch D4 is closed, at the moment, the on-off switch D4 and the on-off switch D5 are in a closed state at the same time, the two branches are connected with each other, and the transition resistor R protects the circuit from short circuit. The on-off switch D5 is then opened, at which time the regulator windings L1, L2, L3 are now connected into circuit. The voltage regulating circuit completes the switching from the 1 gear to the 2 gear.
And (3) closing the on-off switch D3, wherein the on-off switch D4 and the on-off switch D3 are in a closed state at the same time, and the transition resistor R provides short-circuit protection. The on-off switch D4 is then opened and the transition switching unit vacuum interrupter D0 is closed, at which time the regulator windings L1, L2 are now open to the circuit. The circuit completes the switching from 2 nd gear to 3 rd gear.
The vacuum arc extinguish chamber D0 of the transition switching unit is firstly opened, then the on-off switch D2 is closed, at the moment, the on-off switch D2 and the on-off switch D3 are in a closed state at the same time, and the transition resistor R provides short-circuit protection. The on/off switch D3 is then opened, and the voltage regulating winding L1 is now switched into circuit. The voltage regulating circuit completes the switching from 3-gear to 4-gear.
And (3) closing the on-off switch D1, wherein the on-off switch D1 and the on-off switch D2 are in a closed state at the same time, and the transition resistor R provides short-circuit protection. And then the on-off switch D2 is opened, the transition switching unit vacuum arc extinguish chamber D0 is closed, and the voltage regulating windings L1, L2, L3 and L4 are not connected into a circuit at the moment. The circuit completes the switching from 4 th gear to 5 th gear
After the positive voltage regulation is finished, switching from the positive voltage regulation to the negative voltage regulation is performed. The on-off switch Ke is closed firstly, the rated voltage branch is in an on state, then the on-off switch D1 is opened, at the moment, the circuit is externally supplied with voltage by the rated voltage branch, and the polarity switch KaKb is in an uncharged state. Then the polarity switch is rotated to switch from the Ka end to the Kb end. Then the on-off switch D5 is closed, the on-off switch Ke is opened, the circuit is still at 5 grades at the moment, and the switching from positive electrode voltage regulation to reverse electrode voltage regulation is completed.
The vacuum arc extinguish chamber D0 of the transition switching unit is firstly opened, then the on-off switch D4 is closed, at the moment, the on-off switch D4 and the on-off switch D5 are in a closed state at the same time, and the transition resistor R provides short-circuit protection. The on/off switch D5 is then opened, and the voltage regulating winding L4 is switched back into the circuit. The voltage regulating circuit completes the switching from 5 th gear to 6 th gear.
The on-off switch D3 is closed, then the on-off switch D4 is opened, then the vacuum arc extinguish chamber D0. of the transition switching unit is closed, the voltage regulating windings L4 and L3 are reversely connected into the circuit, and the voltage regulating circuit completes switching from 6 grades to 7 grades.
The vacuum arc extinguish chamber D0 of the transition switching unit is firstly switched off, then the on-off switch D2 is switched on, then the on-off switch D3 is switched off, at the moment, the voltage regulating windings L4, L3 and L2 are reversely connected into the circuit, and the voltage regulating circuit completes switching from 7 grades to 8 grades.
The on-off switch D1 is closed, then the on-off switch D2 is opened, then the transition switching unit vacuum arc extinguish chamber D0. is closed, at this time, the voltage regulating windings L4, L3, L2 and L1 are all reversely connected into a circuit, and the voltage regulating circuit completes the switching from 8 grades to 0 grades.
Although the connection modes of the other ends of the four voltage regulating branches in the circuits of fig. 1 and 2 are different, the connection modes are only sequence changes in nature. Although the corresponding relation between the combination state of the on-off switch, the polarity switch and the vacuum arc-extinguishing chamber in the transition switching unit and each gear of the transformer is different, the principle is the same, and the two have the same beneficial effect, and are two different preferred embodiments under the same technical scheme.
Claims (6)
1. An on-load voltage regulation circuit with polarity conversion for a staggered parallel nine-gear transformer is characterized by comprising a main winding, a polarity conversion switch, a voltage regulation winding, a transition switching unit, a rated voltage branch and five voltage regulation branches;
the voltage regulating winding is formed by sequentially connecting four sections of voltage regulating coils wound in the same direction end to end, the voltage regulating winding comprises two end taps and three middle taps, the tap at the input end of the main winding is connected with the input end of the voltage regulating circuit, and the tap at the output end of the main winding is connected with a common contact of the polarity change-over switch; two independent contacts of the polarity conversion switch are respectively connected with two end taps of the voltage regulating winding;
the transition switching unit is formed by connecting a transition resistor and an on-off switch in parallel, two ends of the parallel structure are a first input end and a second input end of the transition switching unit, and the second input end is also used as an output end of the voltage regulating circuit;
each voltage regulating branch is connected with an on-off switch in series, and one end of each voltage regulating branch is connected to two end taps and a middle tap of the voltage regulating coil respectively; the other ends of the two groups of the transition switching units are adjacently connected in parallel in a staggered mode and are respectively connected with the two input ends of the transition switching unit;
the rated voltage branch is connected with an on-off switch in series, and one end of the rated voltage branch is connected with the output end of the main winding; the other end may be connected to either end of the transitional switching unit.
2. The on-load tap changing circuit of the interleaved parallel nine-speed transformer with polarity conversion according to claim 1, wherein the on-off switch of the transition switching unit is a vacuum arc extinguishing chamber.
3. The on-load tap changer of claim 1, wherein the on-off switches connected in series to the tap-changing branch and the rated voltage branch are vacuum interrupters.
4. The on-load tap changer of claim 1, wherein the other end of said voltage rating branch is connected to the output of the tap changer.
5. The on-load tap changing circuit of the interleaved parallel type nine-gear transformer with polarity conversion according to claim 1, which is characterized in that: the other ends of the three voltage regulating branches are directly connected with a second input end of the transition switching unit; the voltage regulating branch circuit is connected with the middle upper end tap, the voltage regulating branch circuit is connected with the middle lower end tap, and the other ends of the two voltage regulating branch circuits are connected with the first input end of the transition switching unit.
6. The on-load tap changing circuit of the interleaved parallel nine-speed transformer with polarity conversion according to claim 1, wherein the voltage regulating branch is connected with an upper end tap, the voltage regulating branch is connected with a middle end tap, and the voltage regulating branch is connected with a lower end tap, and the other ends of the three voltage regulating branches are connected with a first input end of the transition switching unit; the voltage regulating branch circuit is connected with the middle upper end tap, the voltage regulating branch circuit is connected with the middle lower end tap, and the other ends of the two voltage regulating branch circuits are connected with the second input end of the transition switching unit.
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| CN201921100520.4U CN210469152U (en) | 2019-07-15 | 2019-07-15 | On-load voltage regulation circuit with polarity conversion for staggered parallel nine-gear transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212829A (en) * | 2019-07-15 | 2019-09-06 | 浙江宝威电气有限公司 | A kind of nine grades of transformer on-load voltage regulating circuits of staggered-parallel-type with dipole inversion |
| CN114430247A (en) * | 2020-10-29 | 2022-05-03 | 浙江宝威电气有限公司 | Voltage regulating circuit of nine-gear transformer |
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2019
- 2019-07-15 CN CN201921100520.4U patent/CN210469152U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212829A (en) * | 2019-07-15 | 2019-09-06 | 浙江宝威电气有限公司 | A kind of nine grades of transformer on-load voltage regulating circuits of staggered-parallel-type with dipole inversion |
| CN114430247A (en) * | 2020-10-29 | 2022-05-03 | 浙江宝威电气有限公司 | Voltage regulating circuit of nine-gear transformer |
| CN114430247B (en) * | 2020-10-29 | 2024-05-24 | 浙江宝威电气有限公司 | Voltage regulating circuit of nine-gear transformer |
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