CN101996752B - Transformer split-type arcless on-load tap switch - Google Patents

Abstract

The invention discloses a transformer split-type arcless on-load tap switch, which comprises a plurality of singular taps connected with a transformer winding, a plurality of double taps, and a changeover switch moving contact which is connected with an outgoing line terminal and is dragged by a motor under the drive of the changeover switch, and further comprises a first two-way switch and a second two-way switch, and a first tapping selector and a second tapping selector, wherein a plurality of static contacts of the first tapping selector are respectively connected with a singular static tap of the transformer winding; the moving contacts of the first tapping selector are respectively connected with one end of a first straight-through contact and one end of the first two-way switch; a plurality of static contacts of the second tapping selector are respectively connected with the double taps of the transformer winding, and the moving contacts of the second tapping selector are respectively connected with one end of the second two-way switch and one end of a second straight-through contact. The transformer split-type arcless on-load tap switch can realize the arcless changeover of the taps of the transformer winding, is low in cost and reliable in operation.

Description

A transformer split type arcless on-load tap changer

technical field

The invention relates to the field of transformers, in particular to a transformer split type arcless on-load tap changer.

Background technique

In the prior art, due to changes in the primary side voltage (grid voltage), load size and nature of the distribution transformer in operation, the secondary side voltage may have a large change. Distribution transformers in my country cover voltage levels below 35kV. In order to maintain the load voltage within the specified range (±5% UN) and ensure the normal needs of electrical equipment, the distribution transformer must be adjusted.

The basic principle of transformer on-load voltage regulation is to draw several taps from the coil on one side of the transformer (usually the high-voltage side), and switch from one tap to Another tap is used to change the effective number of turns to adjust the voltage. The on-load tap changer is composed of two parts, one part is the transformer body, which is different from the usual transformer in that it leads to multiple taps, and the other part is the on-load tap changer, which can be supplied and assembled by different manufacturers.

Commonly used transformer on-load tap-changers are divided into two categories: mechanical type and vacuum type. Mechanical on-load tap-changers have two structures: one-piece and two-piece.

In the integrated mechanical on-load tap-changer, the winding taps directly form a circular body, and each tap constitutes a static contact. The moving contact is composed of a contact with transition resistance and a straight contact, which can be in the form of single transition resistance, double transition resistance or multiple transition resistance.

Split mechanical on-load tap-changers consist of a switch selector and a diverter switch. The switch selector is composed of two rings, which are respectively connected to the odd-numbered and even-numbered taps. The tap selector drives the motor to drive the moving contacts of the tap selector to connect to one tap respectively. The two moving contacts of the tap selector output as The two static contacts of the diverter switch, each static contact is equipped with a transition resistor to form a double resistance structure, and only one contact is connected to the output cable in a steady state. The moving contact of the diverter switch has only one straight-through contact, which is driven by the diverter switch drive motor to switch from one static contact to the other.

Vacuum tap changers generally adopt a split structure, and the taps of the windings are switched by the tap selector. The static contacts of the diverter switch are respectively connected to a vacuum switch, a transitional vacuum switch is installed between the two static contacts, and a transitional resistor is installed between the transitional vacuum switch and one of the static contacts. Three vacuum switch outputs have two structures: fixed connection and mobile connection. In the fixed connection mode, the output of the three vacuum switches can be short-circuited and fixedly connected to the winding, and the current can be transferred between different taps only by controlling the vacuum switch. The mobile connection method adopts a moving contact, and the moving contact has only one straight-through contact, which is driven by the switching switch to switch from one static contact to the other. During the movement, the position of the moving contact is judged in real time to realize the vacuum switch The on-off control of the transformer ensures that the transformer winding is not open circuited and the winding taps are not short-circuited.

The existing problems are: the mechanical tap changer generates arc during the tap switching process, causing contact ablation; when the vacuum tap changer adopts a fixed structure, the off-state vacuum switch is always under voltage, and it needs to be designed according to the system voltage. Due to the slow opening and closing time of the vacuum switch in the conventional structure, the moving speed of the moving contact needs to be coordinated with it, which is difficult to control.

Moreover, the above-mentioned tap changers all need transition resistors, which increases losses.

At present, there is also an all-electronic tap changer structure. The electronic switch is composed of power electronic devices such as thyristors. Each transformer winding tap is connected to an electronic switch. The tap switching is realized through certain timing control and does not require transition resistors. This solution requires high withstand voltage of the electronic switch, and the structure is complex and expensive.

There is also an electromechanical hybrid tap changer structure, which is equivalent to replacing the double transition resistors of the mechanical tap changer with anti-parallel thyristors, and the tap switching is realized by controlling the opening and closing of the thyristors and the moving position of the straight-through contacts. In this scheme, since the thyristor is a semi-controlled device, it is difficult to realize the timing coordination of the thyristor on and off when the movable contact moves.

Contents of the invention

(1) Technical problems to be solved

The purpose of the invention is to make the tap changer realize the arc-free switching of the taps of the transformer winding, and the cost is low and the operation is reliable.

(2) Technical solutions

In order to achieve the above object, the present invention proposes a transformer split-type arcless on-load tap-changer, which includes a plurality of odd-numbered taps connected to the winding of the transformer, a plurality of even-numbered taps and a switch-driven motor connected to the outlet terminals. The moving contact of the diverter switch to be dragged further includes: a first bidirectional switch and a second bidirectional switch, and a first tap selector and a second tap selector, wherein,

A plurality of static contacts of the first tap selector are respectively connected to odd-numbered taps of the transformer winding, and moving contacts of the first tap selector are respectively connected to one end of the first straight-through contact and the first two-way tap. One end of the switch, a plurality of static contacts of the second tap selector are respectively connected to double taps of the transformer winding, and the moving contacts of the second tap selector are respectively connected to one end of the second bidirectional switch and One end of the second through contact, during the moving process of the switch movable contact, the first through contact, the first bidirectional switch, the second bidirectional switch and the other end of the second through contact are sequentially connected with each other The diverter switch is connected with moving contacts.

Wherein, the moving contact of the diverter switch is in the following four states respectively during the moving process. One end is connected; the second state is that the moving contacts of the changeover switch are connected with the first through contact and the other end of the first bidirectional switch; the third state is that the moving contacts of the changeover switch are connected with the first two-way The switch is connected to the other end of the second bidirectional switch; the fourth state is that the moving contacts of the changeover switch are connected to the second bidirectional switch and the other end of the second through contact.

Wherein, it also includes a control module, which is used to control the mechanical movement of the movable contact of the diverter switch through the diverter switch drive motor, trigger and control the first bidirectional switch and the second bidirectional switch, and control the first bidirectional switch. A tap selector and said second tap selector perform selection control.

Wherein, each of the bidirectional switches is composed of a first unidirectional switch and a second unidirectional switch connected in reverse series.

Wherein, the first bidirectional switch is connected in parallel with a resistor.

Wherein, the second bidirectional switch is connected in parallel with a resistor.

Wherein, each of the unidirectional switches is an IGBT.

Wherein, it also includes a tap selector driving motor, the control module includes an on-load tap-changer controller and a diverter switch controller, and the on-load tap-changer controller includes a first communication unit, a tap selector moving contact The tap selector moving contact control unit and the diverter switch moving contact control unit and the second communication unit, the first communication unit is used to receive the control instructions from the upper computer, and the tap selector moving contact and the diverter switch moving contact control unit are used to pass The diverter switch drive motor controls the mechanical movement of the diverter switch movable contact and controls the selection of the first tap selector and the second tap selector through the tap selector drive motor. The second communication unit is used to send a switching start signal to the third communication unit of the diverter switch controller and receive a diverter switch status signal from the third communication unit of the diverter switch controller, and the diverter switch controller includes a third communication unit A unit and a trigger control unit, the trigger control unit is used to cooperate with the mechanical movement to perform trigger control of the first bidirectional switch and the second bidirectional switch.

(3) Beneficial effects

The above technical solution of the present invention has the following advantages: the arcless switching of the on-load tap changer is realized by using the bidirectional switch and the trigger sequence control of the bidirectional switch, and the structure is simple and the operation is reliable.

Description of drawings

Fig. 1 is a structural schematic diagram of a transformer split type arcless on-load tap-changer according to an embodiment of the present invention;

Fig. 2 is the structural representation of the control unit of the embodiment of the present invention;

Figure 3a, 3b, 3c, 3d and 3e are schematic diagrams of the moving contact process of the diverter switch of the present invention;

Figures 4a, 4b, 4c and 4d are trigger timing diagrams of each unidirectional switch controlled by the control unit;

Fig. 5 is a structural schematic diagram of a transformer split-type arcless on-load tap-changer with parallel transition resistors according to an embodiment of the present invention.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figure 1, it is a schematic structural diagram of a transformer split-type arcless on-load tap-changer according to an embodiment of the present invention, which includes odd-numbered taps J1, J3, etc., and even-numbered taps J2, J4, etc. The movable contact D of the diverter switch driven by the diverter switch drive motor connected to the terminal N, the static contacts of the first tap selector are respectively connected with the odd-numbered taps J1, J3, etc., the first tap selection of the first tap selector The moving contact R1 of the switch is respectively connected with one end of the first direct contact K1 and one end of the first bidirectional switch S1, the static contact of the second tap selector is respectively connected with the double-number taps J2, J4, etc., and the second branch The first tap selector moving contact R2 of the connecting selector is respectively connected with one end of the second through contact K2 and one end of the first bidirectional switch S2, and the first tap selector moving contact of the first tap selector R1 can be connected to an odd tap of the transformer by being driven by the tap selector drive motor, and the second tap selector moving contact R2 of the second tap selector can be connected to an even number of transformer by being driven by the tap selector drive motor. A tap is switched on. With the movement of the moving contact D of the diverter switch, the other end of the first through contact K1 located on the moving contact R1 of the first tap selector, the other end of the first two-way switch S1, and the other end of the second tap selector The other end of the second bidirectional switch S2 on the movable contact R2 and the other end of the second through contact K2 are sequentially connected to the movable contact D of the diverter switch.

The transformer split-type arcless on-load tap-changer of the embodiment of the invention shown in Figure 1 is a split-type tap-changer, which is characterized in that it includes two parts: a tap selector and a changeover switch. The tap selector selects taps when it is no-load. Then the on-load switching is realized by the diverter switch. The tap selector is composed of two rings, which are respectively connected to odd-numbered and even-numbered taps. The tap selector drives the motor to drag the moving contact of the selector to connect to one tap respectively, which is the same as a conventional on-load tap-changer. In Figure 1, L and N represent the incoming and outgoing terminals of the winding respectively; S11, S12, S21 to S22 represent power electronic switches, each of which is a one-way switch, consisting of two anti-series bidirectional switches, that is, the first single The directional switch S11 and the second unidirectional switch S12 constitute the first bidirectional switch S1 , while the third unidirectional switch S21 and the fourth unidirectional switch S22 constitute the second bidirectional switch S2 .

The first one-way switch S11, the second one-way switch S12, the third one-way switch S21 and the fourth one-way switch S22 in Fig. Voltage, the reverse does not withstand the voltage, generally a diode is connected in antiparallel with it to form a one-way switch. If bidirectional controllability is required, two unidirectional switches can be connected in reverse series to form a bidirectional switch, as shown in Figure 1. Taking the first bidirectional switch S1 composed of the first unidirectional switch S11 and the second unidirectional switch S12 as an example, when no trigger signal is applied, both unidirectional switches are in the off state, and the bidirectional switch is in the off state; When the first one-way switch S11 is subjected to a positive voltage, a trigger signal is applied to the first one-way switch S11, and the one-way switch forms a path with the diode of the second one-way switch S12, that is, the first two-way switch S1 is turned on; When the one-way switch S12 is subjected to a positive voltage, a trigger signal is applied to the second one-way switch S12, and the one-way switch forms a path with the diode of the first one-way switch S11, that is, the first two-way switch S1 is turned on; The trigger signal is not applied to the one-way switch, but the trigger signal is applied to another one-way switch in anti-series, and the two-way switch cannot be turned on; when the first one-way switch S11 and the second one-way switch S12 apply the trigger signal at the same time , the bidirectional switch is in the on state regardless of the voltage direction.

Fig. 2 is a schematic structural diagram of the control module of the present invention. The control module is composed of on-load tap changer controller and diverter switch controller.

The on-load tap-changer controller includes a first communication unit, a second communication unit, a tap selector moving contact and a diverter switch moving contact control unit, wherein the function of the first communication unit is to communicate with the upper computer and obtain The tap adjustment command sent by the host computer will return to the working state after the switching process; the function of the second communication unit is to send a switching start signal to the third communication unit of the diverter switch controller, and receive the status of the diverter switch from the third communication unit Data; tap selector moving contact and diverter switch moving contact The function of the control unit is to control the operation of the tap selector drive motor and diverter switch drive motor so that they move from the initial position to the target position.

The diverter switch controller arranged close to the diverter switch includes a third communication unit, a trigger control unit, a fault inspection and parameter calculation unit. The function of the trigger control unit is: after receiving the start instruction from the on-load tap-changer controller through the third communication unit, control the bidirectional switch according to a certain sequence to realize arc-free switching of winding taps; fault inspection and parameter calculation The function of the unit is to judge the working state of the two-way switch, send a fault signal to the on-load tap-changer controller when there is a fault, stop the switching process, and calculate the electrical parameters of the switch to provide data for the timing control of the two-way switch.

The transformer split type arcless on-load tap-changer structure shown in Figure 1, the action mechanism of the diverter switch is under the condition that one winding tap is turned on, through the timing control of the first bidirectional switch S1 and the second bidirectional switch S2 and the mechanical Motion coordination realizes the arc-free switching of winding taps, smoothly transitions the load current to the next tap, and realizes the purpose of voltage regulation. The operating principle of the tap selector is the same as that of the conventional on-load tap-changer part of the prior art. When the tap selector ends, the diverter switch starts to act. The working process of the diverter switch is explained below.

Referring to Figure 1, the diverter switch has the first tap selector movable contact R1 and the second tap selector movable contact R2, according to the instruction of the on-load tap changer controller, the diverter switch movable contact D can be moved from the second tap selector to One tap selector moving contact R1 is switched to the second tap selector moving contact R2, or the second tap selector moving contact R2 is switched to the first tap selector moving contact R1. Assuming that in the steady state, the moving contact D of the diverter switch is connected to the first through contact K1 of the moving contact R1 of the first tap selector, and the load current passes through the winding inlet terminal L, the winding, the first tap selector to the second tap selector. A tap selector movable contact R1, and connects the diverter switch movable contact D to the outlet terminal N through the first through contact K1, thereby forming a current path. Assuming that when the host computer command is received to switch from the first tap selector moving contact R1 to the second tap selector moving contact R2, the process of the on-load tap changer controller controlling the movement of the diverter switch moving contact is shown in the figure 3, for the sake of simplicity, only the switch part is shown.

When the movable contact D of the diverter switch moves from the first direct contact K1 to the second direct contact K2, the mechanical action is a continuous process, and the time taken is on the order of milliseconds. During this moving process, the first one-way switch S11 and the second one-way switch S12 of the first two-way switch S1 and the third one-way switch S21 and the fourth one-way switch S22 of the second two-way switch S2 are coordinated by a certain timing. , to achieve arc-free switching from the first through contact K1 to the second through contact K2, the switching time of the electronic switch is on the order of microseconds, and the switching can be completed during the mechanical movement, because the time required for the electrical process Far less than the completion time of mechanical action.

The key to realize the no-fly switching of the on-load tap changer of the present invention is that the electrical switching process must control the opening and closing of the bidirectional switch at different moving positions of the mechanical process, and the opening and closing process must be based on a certain sequence to avoid load open circuit or winding short circuit.

Referring to Fig. 3a, the diverter switch movable contact D is connected with one end of the first through contact K1, and the diverter switch movable contact D is not connected with the first bidirectional switch S1, the second bidirectional switch S2 and the second through contact K2 , all four electronic switches are in the off state at this time, and when receiving the switching instruction, immediately send a trigger signal to the first one-way switch S11 and the second one-way switch S12 to turn them on.

When the diverter switch movable contact D moves to the position in Figure 3b, the diverter switch movable contact D is connected to the first through contact K1 and the first two-way switch S1, but not to the second two-way switch S2 and the second through contact K2 connection, because the resistance of the first through contact K1 is small, although the first one-way switch S11 and the second one-way switch S12 are turned on, the load current still flows through the first through contact K1, with the switching The switch movable contact D moves. When it moves to the position shown in Figure 3c, the switch movable contact D is disconnected from the first through contact K1, and the load current is transferred to the first two-way switch S1. At this time, the switch movable contact D is connected to the first bidirectional switch S1 and the second bidirectional switch S2, but not to the first through contact K1 and the second through contact K2.

When the diverter switch moving contact D moves to the position shown in Figure 3c, the diverter switch moving contact D is placed between the first bidirectional switch S1 and the second bidirectional switch S2, which is the key link of the diverter switch action, where the winding Arcless switching of taps, and avoid load open circuit or winding short circuit. Since the second bidirectional switch S2 is in the off state, it must bear the winding voltage between the taps of the first tap selector movable contact R1 and the second tap selector movable contact R2. When the bidirectional switch S2 is connected, the second bidirectional switch S2 is in a floating state, and the switch voltage drops to zero. When the switch moving contact D moves to connect with both the first bidirectional switch S1 and the second bidirectional switch S2, the second bidirectional switch Only the switch S2 has a voltage drop, so judging whether the second bidirectional switch S2 bears the voltage is used as a criterion for connecting the movable contact D to the second bidirectional switch S2, thereby eliminating the need for a mechanical position judging mechanism. When the switch control module detects that the second bidirectional switch S2 bears the voltage, it starts the switching process from the first bidirectional switch S1 to the second bidirectional switch S2. At this time, the direction data of the load current is needed, and the current is tapped from the first Selector moving contact R1 is positive when it flows to moving contact D, that is, current i>0, otherwise i<0. According to the load current direction and switching direction (from the first bidirectional switch S1 to the second bidirectional switch S2 or from the second bidirectional switch S2 to the first bidirectional switch S1), there are four working conditions, as shown in FIG. 4 .

Fig. 4a and Fig. 4b show the switching process from the first bidirectional switch S1 to the second bidirectional switch S2, and Fig. 4c and Fig. 4d show the switching process from the second bidirectional switch S2 to the first bidirectional switch S1, and take Fig. 4a as an example below To explain the switching process, the working condition is that the current i>0, and the first bidirectional switch S1 is switched to the second bidirectional switch S2.

Assume that when the moving contact D of the diverter switch is in the position shown in Figure 3c, the current flows from the moving contact R1 of the first tap selector to the moving contact D of the diverter switch through the first bidirectional switch S1, that is, the current i>0, and the current passes through The switch tube of the first one-way switch S11 and the diode of the second one-way switch S12 flow, that is, the state before the time t1 shown in Figure 4a, and the second one-way switch S12 is turned off at the time t1 without affecting the current flow; time, such as 3 microseconds, to ensure that the second one-way switch S12 is reliably turned off; at time t2, the third one-way switch S21 is triggered to be turned on, and the load current is transferred to the third one-way switch S21 and passed through the fourth one-way switch S22 At this time, because the second one-way switch S12 and the fourth one-way switch S22 are not conducting, so as to ensure that the winding is not short-circuited, and the load current is not in the circuit, and the delay time to t3 ensures that the third one-way switch S21 is reliably turned on; turn off the first one-way switch S11 at time t3, and all the load current is transferred to the third one-way switch S21, and delay until t4 to ensure that the first one-way switch S11 is reliably turned off; turn on at time t4 S22, completely turn on the second bidirectional switch S2, and completely turn off the first bidirectional switch S1.

When all the current is transferred to the second bidirectional switch S2, as the moving contact D of the diverter switch moves, when the first bidirectional switch S1 and the movable contact D of the diverter switch are disconnected, it will not cause the load to open. At the 3d position, the diverter switch movable contact D is connected to the second through contact K2, and at the same time the diverter switch movable contact D is also connected to the second bidirectional switch S2. Since the resistance of the second through contact K2 is much smaller than that of S2, the current is transferred to When the second direct contact K2 detects that the current of the second bidirectional switch S2 suddenly decreases to close to zero, it can be judged that the switch movable contact D has communicated with the second direct contact K2, and the second direct contact can be removed. The second bidirectional switch S2 triggers the signal to turn off the second bidirectional switch S2.

When the diverter switch movable contact D moves to the position shown in Figure 3e, the diverter switch movable contact D is disconnected from the first through contact K1, the first bidirectional switch S1 and the second bidirectional switch S2, and is only connected to the second through contact The head K2 is connected, and a switching process is completely completed.

The working principles of the other three working conditions are basically the same, which can be understood by referring to Figures 4b-4d, and will not be repeated here.

A new type of on-load tap-changer according to the embodiment of the present invention shown in Figure 1 can connect a transition resistor in parallel to each bidirectional switch, which is equivalent to connecting a transition resistor in parallel on a conventional mechanical on-load tap-changer Bi-directional switch, as shown in Figure 5. This structure still belongs to the scope of protection of the present invention, and its control principle is the same as that of the case without transition resistance. When the bidirectional switch fails and the result is an open circuit, it can still be used as a conventional on-load tap changer. When the fault result of the bidirectional switch is a short circuit, if only one bidirectional switch is faulty, the on-load tap-changer can be used with a single transition resistor, and the fault signal is uploaded to the on-load tap-changer control module, and the switching is stopped to avoid the expansion of the fault ; When both two-way switches are faulty and short-circuited, if the intermittent switching will cause a short circuit of the winding, the operation should be prohibited at this time. Since the probability of two bidirectional switches failing at the same time is very small, generally when one bidirectional switch fails, it should be repaired in time to avoid developing to a complete failure.

Above-mentioned process has explained working principle and basic composition of the present invention with single-phase winding as example, and the structure shown in Fig. 1 and Fig. 5 all can be used for three-phase structure through simple expansion, the tap of three-phase on-load tap-changing transformer There are structures such as three-phase star-shaped neutral point taps, angled connection end taps and angled connection center taps, no matter which structure is used, it does not affect the use of the present invention.

The foregoing is only an embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the technical principle of the present invention. It should be regarded as the protection scope of the present invention.

Claims (8)

1. A transformer split-type arcless on-load tap-changer, including a plurality of odd-numbered taps connected to the winding of the transformer, a plurality of even-numbered taps and a diverter switch moving contact driven by a diverter switch drive motor connected to the outlet terminal The head is characterized in that it also includes: a first bidirectional switch and a second bidirectional switch, and a first tap selector and a second tap selector, wherein, A plurality of static contacts of the first tap selector are respectively connected to odd-numbered taps of the transformer winding, and moving contacts of the first tap selector are respectively connected to one end of the first straight-through contact and the first two-way tap. One end of the switch, a plurality of static contacts of the second tap selector are respectively connected to double taps of the transformer winding, and the moving contacts of the second tap selector are respectively connected to one end of the second bidirectional switch and One end of the second through contact, during the moving process of the switch movable contact, the first through contact, the first bidirectional switch, the second bidirectional switch and the other end of the second through contact are sequentially connected with each other The diverter switch is connected with moving contacts. 2. The transformer split type arcless on-load tap-changer according to claim 1, characterized in that, the moving contact of the diverter switch is in the following four states during the moving process, the first state is the switching The switch movable contact is only connected to the other end of the first through contact or the second through contact; the second state is that the changeover switch movable contact is connected to the first through contact and the first two-way The other end of the switch is connected; the third state is that the moving contacts of the diverter switch are connected with the other ends of the first bidirectional switch and the second bidirectional switch; the fourth state is that the movable contacts of the diverter switch are connected with the second The bidirectional switch is connected to the other end of the second through contact. 3. The transformer split type arcless on-load tap changer as claimed in claim 2, further comprising a control module for controlling the mechanical movement of the moving contact of the diverter switch through the drive motor of the diverter switch, and controlling the The trigger control of the first bidirectional switch and the second bidirectional switch and the selection control of the first tap selector and the second tap selector are performed. 4 . The transformer split type arcless on-load tap changer according to claim 3 , wherein each of the bidirectional switches is composed of a first unidirectional switch and a second unidirectional switch connected in reverse series. 5. The transformer split type arcless on-load tap changer according to claim 4, characterized in that the first bidirectional switch is connected in parallel with a resistor. 6. The transformer split type arcless on-load tap-changer according to claim 5, characterized in that the second bidirectional switch is connected in parallel with a resistor. 7. The transformer split type arcless on-load tap changer according to claim 6, characterized in that each of the one-way switches is an IGBT. 8. The transformer split type arcless on-load tap-changer according to any one of claims 3-7, characterized in that it also includes a tap selector drive motor, and the control module includes an on-load tap-changer controller and a diverter switch controller, the on-load tap-changer controller includes a first communication unit, a tap selector movable contact and a diverter switch movable contact control unit and a second communication unit, and the first communication unit is used for Receive the control instruction from the upper computer, the tap selector movable contact and diverter switch movable contact control unit are used to control the mechanical movement of the diverter switch movable contact through the diverter switch drive motor and through the tap selector The drive motor is used to control the selection of the first tap selector and the second tap selector, and the second communication unit is used to send a switching start signal to the third communication unit of the diverter switch controller and from The third communication unit of the diverter switch controller receives the diverter switch state signal, the diverter switch controller includes a third communication unit and a trigger control unit, and the trigger control unit is used to cooperate with the mechanical movement to perform the first Bidirectional switch and trigger control of the second bidirectional switch.

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