Head electric switching off-circuit tap switch

Abstract

The utility model provides a head electric switching off-circuit tap switch, which comprises a switch flange plate, a contact system, a central transmission shaft, a head electric operating system and a controller, the head electric operating system comprises a speed reducing motor, a slot shifting piece, a grooved wheel and a gear signal panel; the speed reducing motor is mounted above the switch flange plate; the slot shifting piece is rotationally mounted on the switch flange plate and is in transmission connection with an output shaft of the gear motor; the grooved wheel is coaxially fixed on the central transmission shaft, and a gear signal moving contact is arranged at the bottom of the grooved wheel; the gear signal panel is fixed in an annular groove preset above the switch flange plate and located below the grooved wheel, and a plurality of gear signal contact sets are arranged on the gear signal panel. The controller is electrically connected with the gear signal contact sets and the speed reduction motor. The head electric switching off-circuit tap-changer is simple in structure, low in production and manufacturing cost, simple and convenient in operation process, low in danger coefficient of operators, and capable of realizing operation in a control room or intelligent operation.

Description

Technical Field

[0001] The utility model relates to the technical field of off-circuit tap changers, and particularly relates to an off-circuit tap changer with electric switching at the head. Background Art

[0002] Off-circuit tap changers are mainly applicable to power transformers with off-circuit voltage regulation, distribution transformers, and traction transformers, and also applicable to industrial transformers with off-circuit voltage regulation, especially small electric furnace transformers in smelting. For example, step-up power transformers, three-winding power transformers, and distribution transformers with significant changes in the load of the medium-voltage winding and relatively stable line-end voltage mostly adopt off-circuit voltage regulation methods.

[0003] On the market, off-circuit tap changers can be divided into cage-shaped, drum-shaped, strip-shaped, disc-shaped, etc. according to their structures. The operation and switching of off-circuit tap changers are all carried out after power failure. The operation methods are mainly manual operation at the head, manual operation on the side, and electric operation on the side. The manual operation method at the head has a simple structure and low product manufacturing cost. However, for operation and switching, it is necessary to climb onto the top of the transformer tank to manually operate the handle for switching, with a complex operation process and a high risk coefficient for operators. The manual operation on the side and the electric operation on the side have complex structures and high product manufacturing costs, and the transformer design structure is also complex. The advantages are that the operation process is simple and convenient, the risk coefficient for operators is low, and it can also achieve operation in the control room or intelligent operation.

[0004] In order to save investment and avoid waste, it is very necessary to develop an off-circuit tap changer with high cost performance, simple structure, low production and manufacturing cost, simple and convenient operation process, low risk coefficient for operators, and capable of realizing operation in the control room or intelligent operation. Content of the Utility Model

[0005] In order to solve the above problems, the purpose of the utility model is to provide an off-circuit tap changer with electric switching at the head, which has a simple structure, low production and manufacturing cost, simple and convenient operation process, low risk coefficient for operators, and capable of realizing operation in the control room or intelligent operation. This off-circuit tap changer with electric switching at the head combines the advantages of the existing manual operation at the head, manual operation on the side, and electric operation on the side. By adopting the method of electric mechanical operation at the head and using a controller to control the electric mechanism at the head, the disadvantages of manual operation at the head are effectively avoided, the advantages of manual operation on the side and electric operation on the side are absorbed, with stable and reliable performance and low manufacturing cost. It can also simplify the design and manufacture of the supporting structure of the transformer, save the procurement cost for transformer manufacturing, and thus save investment.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A head electric switching non-excitation tap switch, comprising a switch flange, a contact system mounted on the lower side of the switch flange, and a central transmission shaft rotatably mounted on the switch flange and having its lower end transmission-connected to the contact system; further comprising a head electric operating system and a controller mounted above the switch flange; the head electric operating system comprises a reduction motor, a slot member, a slot wheel and a gear signal disk; the reduction motor is mounted above the switch flange; the slot member is rotatably mounted on the switch flange and is transmission-connected to the output shaft of the reduction motor; the slot wheel is coaxially fixed on the central transmission shaft and can drive the central transmission shaft to rotate under the shifting of the slot member, and a gear signal moving contact is provided at the bottom of the slot wheel; the gear signal disk is fixed in a preset annular groove above the switch flange and is located below the slot wheel, and a plurality of gear signal contact groups are arranged on the gear signal disk in a circumferential distribution with the central transmission shaft as the center and corresponding to the positions of the gear signal moving contacts; the controller is electrically connected to each gear signal contact group through a cable, and is also electrically connected to the reduction motor through a cable.

[0008] Furthermore, each gear signal contact group includes a gear signal common contact located in the inner circle and a gear signal contact located in the outer circle. Each gear signal contact group represents a gear, and each gear signal contact group realizes electrical connection between the gear signal common contact and the gear signal contact through the gear signal moving contact. When the gear signal moving contact is connected to a gear signal contact group, the gear signal contact group transmits the group connection signal to the controller, and the gear value corresponding to the gear signal contact group will be displayed on the display screen of the controller to realize the display of the gear; the controller is electrically connected to the gear signal common contact and the gear signal contact of each gear signal contact group through cables.

[0009] Furthermore, the reducer is a worm gear cycloid reducer, which includes an electric motor and a reducer.

[0010] Furthermore, a plurality of grooves are provided on the outer periphery of the groove wheel; one end of the groove-push member is fixed on the output shaft of the reduction motor, and the other end is provided with a lever cooperating with the groove on the groove wheel. The groove-push member rotates under the drive of the reduction motor, and continuously and alternately engages in or leaves the groove of the groove wheel, driving the groove wheel (and the central transmission shaft) to rotate and perform progressive motion. The rotation of the groove wheel drives the gear signal moving contact at its bottom to contact the gear signal contact group on the gear signal disk, so that the gear signal common contact and the gear signal contact of the gear signal contact group are electrically connected.

[0011] Further, to ensure reliable contact of the contacts, two vertical through-holes are provided on the moving contact of the gear position signal. A contact is movably sleeved in each of the vertical through-holes. The upper ends of the two contacts are connected by a wire, and the lower ends of the two contacts correspond to the two contacts of the gear position signal contact group one by one. At the same time, a spring sleeved outside the contact is provided in the vertical through-hole. When the lower end of the contact is pushed upward, the contact will compress the spring, and the spring gives the contact a downward pressing force.

[0012] Further, the dial groove member, the grooved wheel and the gear position signal disc are all made of insulating materials.

[0013] Further, a control circuit for controlling the forward rotation, reverse rotation or stop of the motor is provided in the controller. A touch panel with a display screen and electrically connected to the control circuit is provided on the front side of the controller. Control buttons for controlling the forward rotation, reverse rotation or stop of the motor are provided on the touch panel.

[0014] Further, the head electric switching off-circuit tap-changer is characterized in that: it further includes a mechanism housing, and the mechanism housing is installed above the switch flange and encloses the head electric operating system airtight.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The structure of the present utility model is simple, the production and manufacturing cost is low, the performance is stable and reliable, it can simplify the design and manufacture of the supporting structure of the transformer, the product use and operation process is simple and convenient, the danger coefficient of the operator is low, it can realize operation in the control room or intelligent operation, it can save the procurement cost and manufacturing cost of the transformer manufacturing, thereby reducing the product price of the off-circuit tap-changer, saving resources for the grid investment; providing a new type of off-circuit tap-changer for the market, adding an option for the design and manufacture of the transformer, and enriching the types of off-circuit tap-changers for transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further details the solution of the present utility model with reference to the drawings.

[0018] Figure 1 It is a schematic structural diagram of the head electric switching off-circuit tap-changer described in the present utility model.

[0019] Figure 2 It is an electrical connection diagram of the head electric switching off-circuit tap-changer described in the present utility model.

[0020] Figure 3 It is a top view of the dial groove member and the grooved wheel described in the present utility model;

[0021] Figure 4 is Figure 3 a cross-sectional view along the A-A direction;

[0022] Figure 5 This is a top view of the gear position signal disc of the present utility model.

[0023] Figure 6 This is a front panel view of the controller of the present utility model.

[0024] Figure 7 This is a rear panel view of the controller of the present utility model.

[0025] As shown in the figure: 1 - controller, 2 - reduction motor, 3 - grooved part, 31 - lever, 4 - sprocket, 4 - groove, 5 - gear position signal moving contact, 6 - gear position signal disc, 61 - gear position signal contact point, 62 - gear position signal common contact point, 7 - central transmission shaft, 8 - mechanism housing, 9 - switch flange, 10 - moving contact system, 11 - static contact group, 12 - cable. Specific embodiments

[0026] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present utility model.

[0027] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have technical essence. Any modification of the structure, change of the ratio relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for easy description and are not used to limit the scope for the implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present utility model.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. Embodiment 1

[0029] like Figures 1 to 7 As shown, this embodiment provides a head electric switching off-excitation tap changer, including a switch flange 9, a contact system, a central transmission shaft 7, a head electric operating system and a controller 1. The head electric switching off-excitation tap changer is installed on a transformer, and the transformer coil lead is connected to the connection terminal of the static contact group 11 in the contact system.

[0030] The switch flange 9 serves as the bearing body of the entire switch, and the lower surface of the outer circle thereof is butt-jointed with the transformer mounting flange.

[0031] The contact system is installed on the lower side of the switch flange 9. The contact system is the same as the contact system of the conventional off-excitation tap changer. The middle insulating shaft supports the moving contact system 10, the circumferential insulating strips support the static contact group 11, and the upper and lower mounting plates fix the circumferential insulating strips. The upper part is coaxially connected to the central transmission shaft 7. The off-excitation tap changer contact system is the main body of the entire switch that carries the current and withstands the voltage, and is also its core.

[0032] The central transmission shaft 7 is rotatably mounted on the central preset position of the switch flange 9 through bearings, retaining rings, oil seals, etc. The upper end of the central transmission shaft 7 is extended to the upper part of the switch flange 9 to connect with the sheave 4, and the lower end is extended to the lower part of the switch flange 9 to connect with the moving contact system 10 of the contact system. The function of the central transmission shaft 7 is to transmit the progressive rotation of the sheave 4 to the moving contact system 10 of the off-excitation tap changer to realize the off-excitation tap changer switching gear.

[0033] The head electric operating system includes a reduction motor 2, a slot-shifting member 3, a slot wheel 4 and a gear position signal plate 6.

[0034] The reduction motor 2 is installed above the switch flange 9, and a worm gear cycloid reducer is selected, which includes an electric motor and a reducer. The reduction motor 2 is electrically connected to the controller 1 through a cable.

[0035] The slot-shifting member 3 is rotatably mounted on the switch flange 9 and is drivingly connected to the output shaft of the reduction motor 2; one end of the slot-shifting member 3 is fixed to the output shaft of the reduction motor 2 through a key and a retaining ring, and the other end is provided with a lever 31 that cooperates with the groove 41 on the groove wheel 4.

[0036] The groove wheel 4 is coaxially fixed on the central transmission shaft 7 by a key and a retaining ring and can drive the central transmission shaft 7 to rotate when the groove shifting member 3 is shifted. A gear signal moving contact 5 is provided at the bottom of the groove wheel 4, and a plurality of grooves 41 are provided on the outer periphery of the groove wheel 4. The groove shifting member 3 rotates under the drive of the reduction motor 2, and the shifting rod 31 of the groove shifting member 3 continuously and alternately engages in or leaves the groove 41 of the groove wheel 4, driving the groove wheel 4 to rotate in a progressive motion, and driving the central transmission shaft 7 to rotate in a progressive manner (driving the contact system to shift gears). The rotation of the groove wheel 4 simultaneously drives the gear signal moving contact 5 at its bottom to contact the gear signal contact group on the gear signal disk 6, so that the gear signal common contact 62 and the gear signal contact 61 of the gear signal contact group are electrically connected. The gear signal moving contact 5 is provided with two vertical through holes, and a contact is movably sleeved in each of the vertical through holes. The upper ends of the two contacts are connected by wires, and the lower ends of the two contacts correspond to the two contacts of the gear signal contact group one by one. At the same time, a spring sleeved outside the contact is provided in the vertical through hole. When the lower end of the contact is pushed upward, the contact compresses the spring, and the spring applies a downward pressing force to the contact. The slot member 3 and the groove wheel 4 are both made of insulating material.

[0037] The gear signal disc 6 is fixed in a preset annular groove above the switch flange 9 and is located below the groove wheel 4. The gear signal disc 6 is disc-shaped and is coaxially arranged with the central transmission shaft 7. The gear signal disc 6 body is made of insulating material. A plurality of gear signal contact groups are arranged on the gear signal disc 6 in a circumferential distribution with the central transmission shaft 7 as the center and corresponding to the position of the gear signal moving contact 5; each gear signal contact group includes a gear signal common contact 62 located on the inner circle and a gear signal contact 61 located on the outer circle (all gear signal contact groups are arranged in a circumferential distribution with the central transmission shaft 7 as the center and corresponding to the position of the gear signal moving contact 5); The gear signal common contacts 62 are connected in series), each gear signal contact group represents a gear, and each gear signal contact group realizes the electrical connection between the gear signal common contact 62 and the gear signal contact 61 through the gear signal moving contact 5. When the gear signal moving contact 5 connects the gear signal common contact 62 and the gear signal contact 61 of a gear signal contact group, the gear signal contact group transmits the connection signal of the group to the controller 1, and the gear value corresponding to the gear signal contact group will be displayed on the display screen of the controller 1 to realize the display of the gear.

[0038] The controller 1 is an intelligent control unit, which uses a PLC and a relay to achieve control. The controller 1 is connected to a 380V AC working power supply. At the same time, the control and display functions can also be connected to the substation control background for display and control through the RS485 interface or corresponding passive contacts on the controller 1. The controller 1 is installed in the control cabinet in the substation control room and is electrically connected to the gear position signal common contact 62 and the gear position signal contact 61 of each gear position signal contact group through a cable. At the same time, it is electrically connected to the motor power supply interface of the reduction motor 2 through a cable. Its function is to receive the corresponding coded signals of the gear position signal contacts, display the current switch gear position, and provide working power for the motor to realize the forward rotation, reverse rotation, and stop of the motor; the control and display functions of the controller 1 can be connected to the substation control background for display and control through the RS485 interface or corresponding passive contacts. A control circuit for controlling the forward rotation, reverse rotation, or stop of the motor is provided in the controller 1, such as Figure 6 As shown, a touch panel with a display screen and electrically connected to the control circuit is provided on the front side of the controller 1. Control buttons for controlling the forward rotation, reverse rotation, or stop of the motor are provided on the touch panel, including the button "1-N" representing the upward instruction, the button "N-1" representing the downward instruction, and the button "Stop" representing the stop instruction.

[0039] The implementation process of switching the switch through the controller 1 operation:

[0040] The controller 1 is connected to a 380V AC working power supply. The gear position signal common contact 62 and the gear position signal contact 61 of the gear position signal disk 6 correspond one by one to form a gear position signal contact group, such as Figure 6 and Figure 7As shown, the gear position signal common contact 62 and the gear position signal contact 61 are connected to the rear panel CX1 of the controller 1 through the cable 12. The display screen on the front panel of the controller 1 shows the gear number corresponding to the currently connected gear position signal contact group. When operating the gear shift, press the buttons "1-N" up instruction, "N-1" down instruction, and "Stop" stop instruction on the front panel of the controller 1 by hand. The controller 1 executes the corresponding instructions and provides the corresponding power supply situation to the motor through the cable 12. The motor realizes forward rotation, reverse rotation, and stop. The motor speed is reduced by the speed reducer, and the rotation of the speed reducer is transmitted to the grooved part 3. The grooved part 3 drives the grooved wheel 4 to perform a progressive movement. The progressive movement of the grooved wheel 4 drives the moving contact system 10 of the non-excited tap changer to perform a progressive rotation through the central rotating shaft 7 to realize the gear shift. At the same time, the grooved wheel 4 drives the moving contact 5 of the gear position signal to the next gear position signal contact group of the gear position signal disk, connects the corresponding gear position signal common contact 62 and the gear position signal contact 61, and transmits the connection signal of this gear position signal contact group to the controller 1 through the cable 12. After the controller 1 makes a judgment, it displays the corresponding gear number on the display screen on its front panel, and at the same time changes the power supply signal supplied to the reduction motor 2 to force the reduction motor 2 to stop running, and the gear shift switching is completed, thus realizing the gear shift operation.

[0041] Implementation process through the operation switch on the background of the control room:

[0042] The controller 1 is connected to a 380v AC working power supply. The gear position signal common contact 62 and the gear position signal contact 61 of the gear position signal disk correspond one by one to form a gear position signal contact group, such as Figure 6 And Figure 7The shown gear position signal common contact and gear position signal contacts are connected to the rear panel CX1 of the controller 1 through the cable 12. The display screen on the front panel of the controller 1 shows the gear number corresponding to the currently connected gear position signal contact group. Through the RS485 interface or one-to-one corresponding passive contacts on the rear panel of the controller 1, each signal function is connected to the background control equipment in the substation control room. Thus, the current switch gear position can be displayed in the control equipment, and instructions can also be sent to the controller 1 through the relevant control keys in the control equipment. After receiving the signal, the controller 1 makes a judgment, and then provides the corresponding power supply situation to the motor through the cable 12. The motor realizes forward rotation, reverse rotation, and stop. The motor speed is reduced by the speed reducer, and the rotation of the speed reducer is transmitted to the grooving member 3. The grooving member 3 drives the sprocket 4 to make a progressive movement. The progressive movement of the sprocket 4 drives the moving contact system 10 of the non-excited tap changer to make a progressive rotation through the central rotating shaft 7 to realize gear shifting. At the same time, the sprocket 4 drives the moving contact 5 of the gear position to the next gear position signal contact group of the gear position signal disc, connects the corresponding gear position signal common contact 62 and gear position signal contact 61, and transmits the connection signal of this gear position signal contact group to the controller 1 through the cable 12. After making a judgment, the controller 1 displays the corresponding gear number on the display screen of its front panel, and at the same time changes the power supply signal supplied to the reduction motor 2 to force the reduction motor 2 to stop operating, and the gear shifting switching ends, thus realizing the gear shifting operation. Embodiment 2

[0043] For dust and waterproof purposes, the following settings are made in this embodiment based on Embodiment 1:

[0044] In addition to including the structure described in the embodiment, the head electric non-excited tap changer further includes a mechanism housing 8, and the mechanism housing 8 is installed above the switch flange 9 and encloses the head electric operating system airtight.

[0045] Other details not elaborated in the present utility model are all well-known conventional technologies in the art.

[0046] It should be noted that the term "comprising", "including" or any other variation is intended to cover a non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0047] The protection scope of the present utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present utility model all fall within the protection scope of the present utility model.

Claims

1. A head electric changeover off-circuit tap-changer, comprising a switch flange, a contact system installed on the lower side of the switch flange, and a central drive shaft rotatably installed on the switch flange and having its lower end drivingly connected to the contact system; characterized in that: It also includes a head electric operating system and a controller installed above the switch flange; the head electric operating system includes a reduction motor, a slot member, a slot wheel and a gear signal disk; the reduction motor is installed above the switch flange; the slot member is rotatably installed on the switch flange and is drivingly connected to the output shaft of the reduction motor; the slot wheel is coaxially fixed on the central transmission shaft and can drive the central transmission shaft to rotate when the slot member is moved, and a gear signal moving contact is provided at the bottom of the slot wheel; the gear signal disk is fixed in a preset annular groove above the switch flange and is located below the slot wheel, and a plurality of gear signal contact groups are provided on the gear signal disk, which are distributed in a circle with the central transmission shaft as the center and correspond to the positions of the gear signal moving contacts; the controller is electrically connected to each gear signal contact group through cables, and is also electrically connected to the reduction motor through cables.

2. The head electric change-over off-circuit tap-changer according to claim 1, characterized in that: Each gear signal contact group includes a gear signal common contact located in the inner circle and a gear signal contact located in the outer circle. Each gear signal contact group represents a gear, and each gear signal contact group realizes electrical connection between the gear signal common contact and the gear signal contact through the gear signal moving contact; the controller is electrically connected to the gear signal common contact and the gear signal contact of each gear signal contact group through a cable.

3. The head electric switching off-circuit tap-changer according to claim 1, characterized in that: The reducer is a worm gear cycloid reducer, which includes an electric motor and a reducer.

4. The head electric switching off-circuit tap-changer according to claim 1, characterized in that: A plurality of grooves are arranged on the outer circumference of the groove wheel; one end of the groove-push member is fixed on the output shaft of the reduction motor, and the other end is provided with a lever cooperating with the groove on the groove wheel. The groove-push member rotates under the drive of the reduction motor, and continuously and alternately engages in or leaves the groove of the groove wheel, driving the groove wheel to rotate and perform progressive motion. The rotation of the groove wheel drives the gear signal moving contact at its bottom to contact the gear signal contact group on the gear signal disk, so that the gear signal common contact and the gear signal contact of the gear signal contact group are electrically connected.

5. The head electrically switched off-circuit tap-changer according to claim 4, characterized in that: The gear signal moving contact is provided with two vertical through holes, and a contact is movably sleeved in each of the vertical through holes. The upper ends of the two contacts are connected by a wire, and the lower ends of the two contacts correspond one by one to the two contacts of the gear signal contact group. At the same time, a spring sleeved outside the contact is provided in the vertical through hole. When the lower end of the contact is pushed upward, the contact will compress the spring, and the spring will give the contact a downward pressing force.

6. The on-load tap-changer without exciting current with electric head changeover according to claim 1, characterized in that: The slot-pulling member, the slot wheel and the gear position signal plate are all made of insulating materials.

7. The head electrically switched off-circuit tap-changer according to claim 1, characterized in that: The controller is provided with a control circuit for controlling the forward, reverse or stop of the motor, and the front side of the controller is provided with a touch panel with a display screen and electrically connected to the control circuit, and the touch panel is provided with control buttons for controlling the forward, reverse or stop of the motor.

8. The head electric changeover off-circuit tap-changer according to any one of claims 1-7, characterized in that: It also includes a mechanism shell, which is installed above the switch flange and hermetically covers the head electric operating system.

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