Control system of air-cooled induction voltage regulator

Abstract

The utility model relates to a control system of an air-cooled induction voltage regulator, which comprises a power supply module, and the power supply module comprises a first power supply and a second power supply. The first circuit, the second circuit and the third circuit are connected with the power supply module, and the first circuit is connected with the first power supply and the second circuit and used for controlling the second circuit; the second circuit is connected with the third circuit and used for adjusting the rotating direction of the voltage regulating motor according to the operation of the first circuit so as to control the third circuit; the third circuit is connected with the second power supply and the load and used for outputting voltage. Travel switches are arranged in the first circuit and the second circuit, so that the voltage regulator has zero-potential voltage-limiting protection and high-potential voltage-limiting protection functions in the voltage regulation process, and the output voltage of the voltage regulator is limited within a certain range; a buck-boost interlocking function is realized through the interlocking contacts, a voltage regulating motor interphase short circuit fault possibly caused by forward rotation and reverse rotation of the voltage regulating motor is prevented, the system safety is improved, and safe and reliable operation of each part of the voltage regulator is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of induction voltage regulator, in particular to a control system of an air-cooled induction voltage regulator. BACKGROUND

[0002] The induction voltage regulator is an electrical equipment which can continuously, smoothly and steplessly regulate the secondary load voltage in the live state by changing the relative angular displacement and coupling mode of the stator and rotor windings and using the electromagnetic induction principle. In essence, the induction voltage regulator is an asynchronous motor with a braked rotor, in which the rotor winding serves as the primary winding and the stator winding serves as the secondary winding. The induction voltage regulator is widely used in important fields such as motor and electrical appliance testing, electric furnace temperature control, rectifier equipment matching and generator excitation. Therefore, the voltage regulation mode, precision and stability of the induction voltage regulator are crucial to the production of various industries.

[0003] However, in the conventional technology, the induction voltage regulator mainly relies on manual or DC motor for voltage regulation. The manual voltage regulation mode requires manual rotation of the voltage regulation handle, which is time-consuming and labor-intensive, and has low operation safety. The voltage regulation process also depends on the experience of the operator, and the voltage regulation error is large. The voltage regulation precision of the DC motor voltage regulation mode is low, and the stability is poor. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a control system of an air-cooled induction voltage regulator to improve the regulation precision and stability of the induction voltage regulator.

[0005] The control system of the air-cooled induction voltage regulator comprises:

[0006] a power module comprising a first power supply and a second power supply; and connected with the power module:

[0007] a first circuit connected with the first power supply and a second circuit, for controlling the second circuit;

[0008] a second circuit connected with a third circuit, for adjusting the rotation direction of a voltage regulation motor according to the operation of the first circuit, to control the third circuit;

[0009] a third circuit connected with the second power supply and a load, for outputting voltage.

[0010] In one embodiment, the first circuit comprises:

[0011] an operation circuit for controlling the output voltage of the voltage regulation motor;

[0012] an indication circuit connected in parallel with the operation circuit and then connected in series between the first power supply and the second circuit.

[0013] In one embodiment, the operation circuit comprises:

[0014] The voltage-boosting branch includes a voltage-boosting button, a normally closed contact of the second contactor, a first contactor, and a normally closed contact of the upper limit travel switch;

[0015] The voltage-reducing branch includes a voltage-reducing button, a normally closed contact of the first contactor, a second contactor, and a normally closed contact of the lower limit travel switch.

[0016] The fan start-stop branch includes a fan start-stop button and a third contactor.

[0017] In one embodiment, the indicating circuit includes:

[0018] The power indicating branch is used to indicate whether the control system is live.

[0019] The voltage-boosting indicating branch is used to indicate whether the control system is performing a voltage-boosting operation, and includes a normally open contact of the first contactor and a voltage-boosting signal lamp.

[0020] The voltage-reducing indicating branch is used to indicate whether the control system is performing a voltage-reducing operation, and includes a normally open contact of the second contactor and a voltage-reducing signal lamp.

[0021] The fan indicating branch is used to indicate whether the cooling fan is running, and includes a normally open contact of the third contactor and a fan signal lamp.

[0022] The upper limit indicating branch is used to indicate whether the output voltage of the voltage regulator exceeds the maximum voltage and whether the worm drive mechanism is running to the upper limit, and includes an upper limit signal lamp and a normally open contact of the upper limit travel switch.

[0023] The lower limit indicating branch is used to indicate whether the output voltage of the voltage regulator drops to zero potential, and includes a lower limit signal lamp and a normally open contact of the lower limit travel switch.

[0024] In one embodiment, the system further includes a first thermal relay normally closed contact, a second thermal relay normally closed contact, a third thermal relay normally closed contact, a fourth thermal relay normally closed contact, and a first power switch.

[0025] The first circuit is connected in parallel with a boost branch, a step-down branch, a fan start-stop branch, a power indicator branch, a boost indicator branch, a step-down indicator branch, a fan indicator branch, an upper limit position indicator branch and a lower limit position indicator branch, the first end of the first circuit is connected with the fourth thermal relay normally closed contact, the third thermal relay normally closed contact, the second thermal relay normally closed contact and the first thermal relay normally closed contact in sequence, and the first thermal relay normally closed contact is connected with the zero line of the first power supply; the second end of the first circuit is connected with the first end of the first power supply switch; and the second end of the first power supply switch is connected with the phase line of one phase of the first power supply.

[0026] In one of the embodiments, the second circuit comprises:

[0027] The voltage regulating motor circuit comprises a second power supply switch, a power phase sequence detector, a first contactor main contact, a second contactor main contact, a fourth thermal relay and a voltage regulating motor;

[0028] The first cooling fan circuit comprises the second power supply switch, the phase sequence detector, the third contactor main contact, the first thermal relay and the first cooling fan in sequence;

[0029] The second cooling fan circuit comprises the second power supply switch, the phase sequence detector, the third contactor main contact, the second thermal relay and the second cooling fan in sequence;

[0030] The third cooling fan circuit comprises the second power supply switch, the phase sequence detector, the third contactor main contact, the third thermal relay and the third cooling fan in sequence.

[0031] In one of the embodiments, the first thermal relay, the second thermal relay and the third thermal relay are used for overload protection of the first cooling fan, the second cooling fan and the third cooling fan; the first thermal relay, the second thermal relay and the third thermal relay are respectively connected in series between the third contactor main contact and the first cooling fan, the second cooling fan and the third cooling fan.

[0032] In one of the embodiments, the third circuit comprises a voltage regulator winding circuit, the voltage regulator winding circuit comprises a stator winding and a rotor winding, the stator winding is connected with a load, and the rotor winding is connected with a second power supply.

[0033] In one of the embodiments, the system further comprises:

[0034] The turbine transmission mechanism is connected with the voltage regulating motor and the third circuit; the voltage regulating motor controls the rotation angle of the rotor winding through the turbine transmission mechanism in forward rotation or reverse rotation, and adjusts the output voltage of the voltage regulator.

[0035] In one of the embodiments, the system further comprises an upper limit position travel switch normally closed contact and a lower limit position travel switch normally closed contact.

[0036] When the output voltage of the voltage regulator reaches the maximum value, the worm drive mechanism moves to the upper limit position, and the normally closed contact of the upper limit position travel switch is disconnected.

[0037] When the output voltage of the voltage regulator reaches the minimum value, the worm drive mechanism moves to the lower limit position, and the normally closed contact of the lower limit position travel switch is disconnected.

[0038] The control system of the air-cooled induction voltage regulator has travel switches arranged in the first circuit and the second circuit, so that the voltage regulator has zero potential voltage limiting protection and high potential voltage limiting protection functions during voltage adjustment, and the output voltage of the voltage regulator is limited within a certain range; the up-down voltage boosting interlocking function is realized through interlocking contacts, so as to prevent the voltage regulating motor from being short-circuited between phases due to forward rotation and reverse rotation, improve the safety of the system, and ensure safe and reliable operation of each component of the voltage regulator. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 The figure is a structural schematic diagram of the control system of the air-cooled induction voltage regulator in some embodiments of the present application.

[0041] Figure 2 The figure is a circuit schematic diagram of the control system of the air-cooled induction voltage regulator in some embodiments of the present application.

[0042] Explanation of reference numerals:

[0043] M, voltage regulating motor; AV, induction voltage regulator; KM1, first contactor; KM1 P , main contact of the first contactor; KM1 NC , normally closed contact of the first contactor; KM1 NO , normally open contact of the first contactor; KM2, second contactor; KM2 NC , normally closed contact of the second contactor; KM2 P , main contact of the second contactor; KM2 NO , normally open contact of the second contactor; KM3, third contactor; KM3 P , main contact of the third contactor; KM3 NO , normally open contact of the third contactor; HL1, power signal lamp; HL2, voltage boosting signal lamp; HL3, voltage reducing signal lamp; HL4, fan signal lamp; HL5, upper limit position signal lamp; HL6, lower limit position signal lamp; SP1, upper limit position travel switch; SP1 NC, upper limit position travel switch normally closed contact; SP1 NO , upper limit position travel switch normally open contact; SB1, boost button; T, worm drive mechanism; SB2, step-down button; SP2, lower limit position travel switch; SP2 NC , lower limit position travel switch normally closed contact; SP2 NO , lower limit position travel switch normally open contact; FJ1, first cooling fan; FJ2, second cooling fan; FJ3, third cooling fan; SB3, fan start-stop button; FR1, first thermal relay; FR1 NC , first thermal relay normally closed contact; FR2, second thermal relay; FR2 NC , second thermal relay normally closed contact; FR3, third thermal relay; FR3 NC , third thermal relay normally closed contact; FR4, fourth thermal relay; FR4 NC , fourth thermal relay normally closed contact; QF1, first power switch; QF2, second power switch; XJ, power phase sequence detector. DETAILED DESCRIPTION

[0044] In order to make the above objectives, characteristics and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0047] In this application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0049] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0050] Reference Figure 1 , an embodiment of the present application provides a control system of an air-cooled induction voltage regulator, comprising a power supply module, the power supply module comprising a first power supply and a second power supply; and a first circuit, a second circuit and a third circuit connected with the power supply module, the first circuit being connected with the first power supply and the second circuit, and being used for controlling the second circuit; the second circuit being connected with the third circuit, and being used for adjusting the rotation direction of a voltage regulating motor M according to the operation of the first circuit to control the third circuit; the third circuit being connected with the second power supply and a load, and being used for outputting voltage.

[0051] In this embodiment, the travel switch is arranged in the first circuit and the second circuit, so that the voltage regulator has zero potential voltage limiting protection and high potential voltage limiting protection functions during voltage adjustment, and the output voltage of the voltage regulator is limited within a certain range; the up-down voltage interlocking function is realized through interlocking contacts, so as to prevent the voltage regulating motor M from being short-circuited between phases due to forward rotation and reverse rotation of the voltage regulating motor M, improve the safety of the system, and ensure the safe and reliable operation of each component of the voltage regulator.

[0052] Referring to Figure 1 and Figure 2 In some embodiments, the first circuit includes an operation circuit and an indication circuit; the operation circuit is used to control the output voltage of the voltage regulating motor; and the indication circuit is connected in parallel with the operation circuit and then connected in series between the first power supply and the second circuit.

[0053] The operation circuit includes a boost branch, a buck branch, and a fan start-stop branch. The boost branch includes a boost button, a second contactor normally closed contact, a first contactor, and an upper limit position travel switch normally closed contact. The buck branch is used to drive the voltage regulating motor M to rotate reversely, thereby reducing the output voltage of the induction voltage regulator. The buck branch includes a buck button, a first contactor normally closed contact, a second contactor, and a lower limit position travel switch normally closed contact. The fan start-stop branch is used to control the start and stop of the cooling fan and includes a fan start-stop button and a third contactor.

[0054] Specifically, the boost branch is used to drive the voltage regulating motor M to rotate forward, thereby increasing the output voltage of the induction voltage regulator AV. The boost branch is composed of a boost button SB1, a second contactor KM2 normally closed contact KM2 NC , a first contactor KM1, and an upper limit position travel switch SP1 normally closed contact SP1 NC . The boost button SB1 is a momentary self-resetting normally open button. When the boost button SB1 is pressed, the boost branch is turned on, the first contactor KM1 is energized, the main contact KM1 P of the first contactor KM1 is closed, the voltage regulating motor circuit is forward energized, and the voltage regulating motor M rotates forward. The voltage regulating motor M drives the voltage regulator rotor winding to rotate forward through the worm drive mechanism T, and the output voltage of the voltage regulator stator winding is increased.

[0055] The buck branch is used to drive the voltage regulating motor M to rotate reversely, thereby reducing the output voltage of the induction voltage regulator AV. The buck branch is composed of a buck button SB2, a first contactor KM1 normally closed contact KM1 NC , a second contactor KM2, and a lower limit position travel switch SP2 normally closed contact SP2 NC . The buck button SB2 is a momentary self-resetting normally open button. When the buck button SB2 is pressed, the buck branch is turned on, the second contactor KM2 is energized, the main contact KM2 P of the second contactor KM2 is closed, the voltage regulating motor M reverse circuit is energized, and the voltage regulating motor M rotates reversely. The voltage regulating motor M drives the voltage regulator rotor winding to rotate reversely through the worm drive mechanism T, and the output voltage of the voltage regulator stator winding is reduced.

[0056] The fan start-stop branch is used to control the start and stop of the first cooling fan circuit, the second cooling fan circuit and the third cooling fan circuit. The fan start-stop branch is composed of a fan start-stop button SB3 and a third contactor KM3. The fan start-stop button SB3 is a self-locking normally open button. When the fan start-stop button SB3 is actuated, the fan start-stop button SB3 is closed and self-locked, the third contactor KM3 is energized, the main contact KM3 P of the third contactor KM3 is closed, the first cooling fan circuit, the second cooling fan circuit and the third cooling fan circuit are simultaneously turned on and self-kept, and the first cooling fan, the second cooling fan and the third cooling fan are started and continuously operated to continuously provide cooling gas for the stator winding and the rotor winding.

[0057] The indication circuit includes a power supply indication branch, a boost indication branch, a step-down indication branch, a fan indication branch, an upper limit position indication branch and a lower limit position indication branch. The power supply indication branch is used to remind the operator whether the control system is live, and is composed of a power supply signal lamp HL1. The boost indication branch is used to remind the operator whether the control system is performing a boost operation, and is composed of a first contactor KM1 normally open contact KM1 NO and a boost signal lamp HL2. The step-down indication branch is used to remind the operator whether the control system is performing a step-down operation, and is composed of a second contactor KM2 normally open contact KM2 NO and a step-down signal lamp HL3. The fan indication branch is used to remind the operator whether the cooling fan is running, and is composed of a third contactor KM3 normally open contact KM3 NO and a fan signal lamp HL4. The upper limit position indication branch is used to remind the operator whether the output voltage of the regulator stator winding exceeds the maximum voltage and whether the worm drive mechanism T runs to the upper limit position, and is composed of an upper limit position signal lamp HL5 and an upper limit position travel switch SP1 normally open contact SP1 NO . The lower limit position indication branch is used to remind the operator whether the output voltage of the regulator stator winding drops to zero potential and whether the worm drive mechanism T runs to the lower limit position, and is composed of a lower limit position signal lamp HL6 and a lower limit position travel switch SP2 normally open contact SP2 NO .

[0058] Referring to Figure 2In a further embodiment, the control system further includes a first normally closed contact of a thermal relay, a second normally closed contact of a thermal relay, a third normally closed contact of a thermal relay, a fourth normally closed contact of a thermal relay, and a first power switch; the first circuit is a boost branch, a buck branch, a fan start / stop branch, a power indicator branch, a boost indicator branch, a buck indicator branch, a fan indicator branch, an upper limit indicator branch, and a lower limit indicator branch connected in parallel; the first terminal of the first circuit is sequentially connected to the fourth normally closed contact of the thermal relay, the third normally closed contact of the thermal relay, the second normally closed contact of the thermal relay, and the first normally closed contact of the thermal relay; the first normally closed contact of the thermal relay is connected to the neutral wire of the first power supply; the second terminal of the first circuit is connected to the first terminal of the first power switch; the second terminal of the first power switch is connected to one phase wire of the first power supply.

[0059] In this circuit, after the branches of the first circuit are connected in parallel, the first terminal of the first circuit is sequentially connected to the normally closed contact FR4 of the fourth thermal relay FR4. NC The third thermal relay FR3 normally closed contact FR3 NC The normally closed contact of the second thermal relay FR2 is FR2. NC and the normally closed contact FR1 of the first thermal relay NC Connection, first thermal relay FR1 normally closed contact FR1 NC Finally, it is connected to the neutral wire of the first power supply. After the branches of the first circuit are connected in parallel, the other end of the parallel circuit is connected to one end of the first power switch QF1. The other end of the first power switch QF1 is connected to one phase wire of the first power supply. The first power switch QF1 is a single-phase air switch, which can not only connect and disconnect the first circuit, but also has overcurrent and undervoltage protection functions, improving the safety of the control system.

[0060] Reference Figure 2 In some embodiments, the second circuit includes a voltage regulating motor circuit, a first cooling fan circuit, a second cooling fan circuit, and a third cooling fan circuit.

[0061] Specifically, the voltage regulating motor circuit is used to drive the rotor winding of the voltage regulator to rotate, changing the relative angular displacement of the stator and rotor winding axes. The voltage regulating motor circuit includes a second power switch QF2, a power phase sequence detector XJ, and the main contacts of the first contactor KM1. P Second contactor KM2 main contact KM2 P The fourth thermal relay FR4 and the voltage regulating motor M. The input terminal of the second power switch QF2 is connected to the U, V, and W terminals of the first power supply, and the output terminal of the second power switch QF2 is connected to the main contactor KM1 of the first contactor KM1. P Second contactor KM2 main contact KM2 P Connections. The power phase sequence detector XJ is connected to the second power switch QF2 and the main contact KM1 of the first contactor KM1. P, second contactor KM2 main contact KM2 P . The first contactor KM1 main contact KM1 P and the second contactor KM2 main contact KM2 P are connected in parallel, and are connected with the fourth thermal relay FR4, and the fourth thermal relay FR4 is connected with the voltage regulating motor M, and the rotating shaft of the voltage regulating motor M is connected with the worm gear transmission mechanism T.

[0062] The second power switch QF2 is a three-phase air switch, which can not only connect and disconnect the second circuit, but also has overcurrent and undervoltage protection functions, thereby improving the safety of the control system. The power phase sequence detector XJ is used to determine whether the first power three-phase phase sequence connected with the second power switch QF2 is correct, so as to prevent the voltage from being unable to be normally regulated in the case that the external power phase sequence is changed. When the first power three-phase phase sequence is correct, the power phase sequence detector green light is on, and when the power three-phase phase sequence is incorrect, the power phase sequence detector red light is on, thereby reminding the operator to change the power phase sequence, so as to ensure that the voltage regulating operation and the voltage reducing operation are correct, and the cooling fan wind direction is correct. The voltage regulating motor M adopts a low-speed and large-torque AC servo motor. The AC servo motor can convert the received electrical signal into angular displacement output on the motor shaft, the rotation angle is accurate, the response speed is fast, and the voltage regulating precision of the voltage regulator is improved. The fourth thermal relay FR4 is connected in series between the contactor main contact and the voltage regulating motor M, and is used for overload protection of the voltage regulating motor M. When the current in the winding of the voltage regulating motor M is too large, and the winding temperature rise exceeds the limit value, the fourth thermal relay FR4 will act, the fourth thermal relay FR4 normally closed contact FR4 NC is disconnected, the first circuit is not conducted, the first contactor KM1 or the second contactor KM2 loses power, the first contactor KM1 main contact KM1 P or the second contactor KM2 main contact KM2 P is disconnected, the voltage regulating motor circuit is powered off, and the winding temperature of the voltage regulating motor M is prevented from being too high to burn the voltage regulating motor M.

[0063] The cooling fan is used to continuously provide cooling gas for the stator and rotor windings, so as to prevent the stator and rotor windings from being burned due to high temperature.

[0064] The first cooling fan circuit is sequentially connected by the second power switch QF2, the phase sequence detector XJ, the third contactor KM3 main contact KM3 P , the first thermal relay FR1 and the first cooling fan FJ1. The second cooling fan circuit includes the second power switch QF2, the phase sequence detector XJ, the third contactor KM3 main contact KM3 P , the second thermal relay FR2 and the second cooling fan FJ2. The third cooling fan circuit includes the second power switch QF2, the phase sequence detector XJ, the third contactor KM3 main contact KM3 Pa third thermal relay FR3 and a third cooling fan FJ3.

[0065] The first thermal relay FR1, the second thermal relay FR2 and the third thermal relay FR3 are connected in series between the third contactor main contact and the first cooling fan, the second cooling fan and the third cooling fan respectively, for cooling fan overload protection. When the winding current of the cooling fan is too large and the winding temperature exceeds the limit value, the thermal relay will act, its normally closed contact will be disconnected, the first circuit will not be conducted, the contactor KM3 will lose power, the main contact KM3 P will be disconnected, the cooling fan circuit will be powered off, and the winding temperature of the cooling fan will be prevented from being too high to burn the cooling fan.

[0066] Referring to Figure 2 In some embodiments, the third circuit includes a voltage regulator winding circuit, the voltage regulator winding circuit includes a stator winding and a rotor winding, the stator winding is connected with the load, and the rotor winding is connected with the second power supply.

[0067] The control system further includes a worm gear transmission mechanism connected with the voltage regulating motor M and the third circuit. The voltage regulating motor M controls the rotation angle of the rotor winding through the worm gear transmission mechanism in the forward direction or in the reverse direction, so as to adjust the output voltage of the voltage regulator.

[0068] Specifically, the rotor winding is connected with two phases of the second power supply. The rotor shaft is connected with the worm gear transmission mechanism T. The voltage regulating motor M controls the rotation angle of the rotor winding through the worm gear transmission mechanism T in the forward direction or in the reverse direction, so as to adjust the output voltage of the voltage regulator AV.

[0069] Further, the control system further includes an upper limit travel switch normally closed contact and a lower limit travel switch normally closed contact. When the output voltage of the voltage regulator reaches the maximum value, the worm gear transmission mechanism moves to the upper limit position, and the upper limit travel switch normally closed contact is disconnected. When the output voltage of the voltage regulator reaches the minimum value, the worm gear transmission mechanism moves to the lower limit position, and the lower limit travel switch normally closed contact is disconnected.

[0070] The control system has a high potential voltage limiting protection function, which prevents the output voltage of the voltage regulator from being too high during voltage boosting operation, and prevents the worm gear transmission mechanism T from moving beyond the upper limit position and being damaged. When the output voltage of the voltage regulator reaches the maximum value, the worm gear transmission mechanism T moves to the upper limit position, and the upper limit travel switch SP1 acts immediately, playing a high potential voltage limiting protection function. NC The upper limit travel switch SP1 normally closed contact SP1 P is disconnected, the voltage boosting branch is disconnected, the first contactor KM1 coil is powered off, the first contactor KM1 main contact KM1 NOClose, the upper limit position indicating branch is conducted, the upper limit position indicating lamp is lit, reminding the operator that the output voltage of the voltage regulator has reached the maximum value.

[0071] The control system has zero potential voltage limiting protection function, preventing the output voltage of the voltage regulator from not returning to zero position during the voltage reduction operation, and preventing the worm drive mechanism T from moving beyond the lower limit position and being damaged. When the output voltage of the voltage regulator reaches the minimum value, the worm drive mechanism T moves to the lower limit position, and the lower limit position travel switch SP1 acts immediately, playing the zero potential voltage limiting protection function. The lower limit position travel switch SP2 normally closed contact SP2 NC Open, the voltage reduction branch is disconnected. Since the voltage reduction branch is not conducted, the second contactor KM2 coil is de-energized, and the second contactor KM2 main contact KM2 P Open, the voltage regulation motor circuit is de-energized, and the rotor winding is braked. At the same time, the lower limit position travel switch SP2 normally open contact SP2 NO Close, the lower limit position indicating branch is conducted, and the lower limit position indicating lamp is lit, reminding the operator that the output voltage of the voltage regulator has returned to zero position.

[0072] The voltage increase branch and the voltage reduction branch have mutual restraint interlocking function, preventing the inter-phase short circuit fault of the voltage regulation motor M. When the voltage increase branch is energized, the first contactor KM1 is energized, and the first contactor KM1 normally closed contact KM1 NC Open, the voltage reduction branch is not conducted. Preventing the voltage reduction button SB2 from being mistakenly closed when the voltage increase operation is in progress, resulting in the voltage reduction branch being energized and causing the inter-phase short circuit fault of the voltage regulation motor M. When the voltage reduction branch is energized, the second contactor KM2 is energized, and the second contactor KM2 normally closed contact KM2 NC Open, the voltage increase branch is not conducted. Preventing the voltage increase button SB1 from being mistakenly closed when the voltage reduction operation is in progress, resulting in the voltage increase branch being energized and causing the inter-phase short circuit fault of the voltage regulation motor M, ensuring the safe and reliable operation of the components of the voltage regulator.

[0073] In the description of the specification, the description referring to the terms "some embodiments", "other embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the present application. The illustrative description of the above terms in the specification does not necessarily refer to the same embodiment or example.

[0074] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0075] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A control system for an air-cooled induction voltage regulator, characterized in that, The system comprises: a power module comprising a first power supply and a second power supply; and a first circuit connected with the first power supply and a second circuit, for controlling the second circuit; a second circuit connected with a third circuit, for adjusting the rotation direction of a voltage regulating motor according to the operation of the first circuit, to control the third circuit; a third circuit connected with the second power supply and a load, for outputting voltage.

2. The system of claim 1, wherein, The first circuit comprises: an operation circuit for controlling the output voltage of the voltage regulating motor; an indication circuit connected in parallel with the operation circuit and then connected in series between the first power supply and the second circuit.

3. The system of claim 2, wherein, The operation circuit comprises: a voltage increasing branch comprising a voltage increasing button, a second contactor normally closed contact, a first contactor, and an upper limit position travel switch normally closed contact; a voltage decreasing branch for driving the voltage regulating motor to rotate reversely, to decrease the output voltage of the induction voltage regulator, the voltage decreasing branch comprising a voltage decreasing button, a first contactor normally closed contact, a second contactor, and a lower limit position travel switch normally closed contact; a fan start-stop branch for controlling the start and stop of a cooling fan, comprising a fan start-stop button and a third contactor.

4. The system of claim 3, wherein, The indication circuit comprises: a power supply indication branch for indicating whether the control system is live; a voltage increasing indication branch for indicating whether the control system is performing voltage increasing operation, the voltage increasing indication branch comprising a first contactor normally open contact and a voltage increasing signal lamp; a voltage decreasing indication branch for indicating whether the control system is performing voltage decreasing operation, the voltage decreasing indication branch comprising a second contactor normally open contact and a voltage decreasing signal lamp; a fan indication branch for indicating whether the cooling fan is running, the fan indication branch comprising a third contactor normally open contact and a fan signal lamp; an upper limit position indication branch for indicating whether the output voltage of the voltage regulator exceeds the maximum voltage, and whether the worm drive mechanism is running to the upper limit position, the upper limit position indication branch comprising an upper limit position signal lamp and an upper limit position travel switch normally open contact; a lower limit position indication branch for indicating whether the output voltage of the voltage regulator decreases to zero potential, the lower limit position indication branch comprising a lower limit position signal lamp and a lower limit position travel switch normally open contact.

5. The system of claim 4, wherein, The system further comprises a first thermal relay normally closed contact, a second thermal relay normally closed contact, a third thermal relay normally closed contact, a fourth thermal relay normally closed contact, and a first power supply switch; the first circuit is connected in parallel with the voltage increasing branch, the voltage decreasing branch, the fan start-stop branch, the power supply indication branch, the voltage increasing indication branch, the voltage decreasing indication branch, the fan indication branch, the upper limit position indication branch, and the lower limit position indication branch, a first end of the first circuit is connected with the fourth thermal relay normally closed contact, the third thermal relay normally closed contact, the second thermal relay normally closed contact, and the first thermal relay normally closed contact in sequence, the first thermal relay normally closed contact is connected with the zero line of the first power supply; a second end of the first circuit is connected with a first end of the first power supply switch; a second end of the first power supply switch is connected with one phase line of the first power supply.

6. The system of claim 1, wherein, The second circuit comprises: The voltage regulating motor circuit comprises a second power switch, a power phase sequence detector, a first contactor main contact, a second contactor main contact, a fourth thermal relay and a voltage regulating motor. The first cooling fan circuit comprises a second power switch, a phase sequence detector, a third contactor main contact, a first thermal relay and a first cooling fan connected in sequence. The second cooling fan circuit comprises a second power switch, a phase sequence detector, a third contactor main contact, a second thermal relay and a second cooling fan connected in sequence. The third cooling fan circuit comprises a second power switch, a phase sequence detector, a third contactor main contact, a third thermal relay and a third cooling fan connected in sequence.

7. The system of claim 6, wherein, The first thermal relay, the second thermal relay and the third thermal relay are used for overload protection of the first cooling fan, the second cooling fan and the third cooling fan.

8. The system of claim 1, wherein, The third circuit comprises a voltage regulator winding circuit, the voltage regulator winding circuit comprises a stator winding and a rotor winding, the stator winding is connected with a load, and the rotor winding is connected with the second power supply.

9. The system of claim 8, wherein, The system further comprises: A turbine transmission mechanism connected with the voltage regulating motor and the third circuit; the voltage regulating motor controls the rotation angle of the rotor winding through the turbine transmission mechanism to adjust the output voltage of the voltage regulator.

10. The system of claim 9, wherein, The system further comprises an upper limit position travel switch normally closed contact and a lower limit position travel switch normally closed contact. When the output voltage of the voltage regulator reaches the maximum value, the worm transmission mechanism moves to the upper limit position, and the upper limit position travel switch normally closed contact is disconnected. When the output voltage of the voltage regulator reaches the minimum value, the worm transmission mechanism moves to the lower limit position, and the lower limit position travel switch normally closed contact is disconnected.

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