On-load voltage regulation switch and on-load voltage regulation distribution transformer

Abstract

The invention discloses an on-load voltage regulation switch and an on-load voltage regulation distribution transformer, the switch is an on-load voltage regulation switch of a trisection disc type structure, the switch comprises a driving mechanism, an installation main board and an execution mechanism, the driving mechanism comprises a driving motor, a gearbox and a driving bevel gear, and the execution mechanism has three phases, each phase of actuating mechanism can form an independent component module structure; each actuating mechanism comprises a transmission mechanism, a selection switch component, a change-over switch component and a transition element; the driving motor drives the driving bevel gear to rotate by means of the gearbox, the driving bevel gear drives the three-phase transmission mechanism to rotate, and the transmission mechanism of each phase drives the selection switch assembly and the change-over switch assembly corresponding to each phase to have sequential actions, so that conversion of voltage regulation gears is completed. A disc type structure is adopted, a three-phase transmission mechanism is designed in a modularized mode and acts independently, meanwhile, a wide voltage regulation range is achieved, and the device is particularly suitable for a three-dimensional roll iron core distribution transformer, convenient to install and high in reliability.

Description

Technical Field

[0001] The device relates to the technical field of electric power products, and in particular to an on-load voltage regulating switch and an on-load voltage regulating distribution transformer. Background Art

[0002] The distribution transformer is the last transformer of the power supply network. It is used in various fields of national economy and people's livelihood, and is spread all over every corner of urban and rural areas. The number is huge. The current distribution transformers are all off-excitation voltage regulation mode. When regulating the voltage, it is necessary to cut off the power supply first, and then manually adjust the off-excitation voltage regulating switch. After the adjustment is completed, the power supply can be restored. Since the voltage can only be adjusted by power outage, and it cannot be adjusted in time, the distribution transformer in the actual power supply network is equivalent to no voltage regulation measures, resulting in low power supply voltage qualification rate, poor stability, abnormal operation of electrical equipment, and increased losses of the distribution transformer itself and electrical equipment. In recent years, with the continuous improvement and development of social economy and power grid, the energy efficiency of transformers has become higher and higher. The three-dimensional wound iron core distribution transformer has gradually become one of the mainstream distribution transformers. With the continuous improvement of the requirements of the National Energy Administration and the State Grid for voltage quality, the demand for on-load voltage regulation distribution transformers will continue to increase, and the requirements for their reliability will also become higher and higher. Most of the on-load voltage regulators in the current market are bar-type on-load voltage regulators, which are not particularly suitable for three-dimensional coil core distribution transformers with triangular distribution of core and coil. There are also 5-speed disk-type on-load voltage regulators on the market, but with the continuous access of new energy, its voltage regulation range cannot meet the needs of users. In order to meet the needs of different occasions, the demand for the number of voltage regulation gears and wide voltage regulation range of on-load voltage regulation distribution transformers will continue to increase, and at the same time, the structural form of on-load voltage regulators that can correspond to the distribution of the core and coil of the distribution transformer is also needed.

[0003] MR of Germany has applied for the following Chinese invention patents in China: 1. Application number 201780005054.9, invention name "On-load tap changer"; 2. Application number 201780007088.1, invention name "On-load tap changer, adjustable transformer with on-load tap changer and method for switching on-load tap changer". The above two invention patents only describe the structure and operation of the selection component and switching component of the on-load tap changer, but do not describe its driving transmission mechanism. It can also be seen from the drawings in the specification of the above patents that they are all on-load voltage regulators with a strip structure. Jinan Aidi Electrical Equipment Co., Ltd. has applied for the following Chinese invention patents: 1. Application number is 201811188811.3, the invention name is "A special on-load voltage regulating switch for distribution transformer and on-load voltage regulating distribution transformer"; 2. Application number is 201910056946.2, the invention name is "A special on-load voltage regulating switch for distribution transformer and on-load voltage regulating distribution transformer". From the drawings in the specification of the above two invention patents, it can be seen that the design schemes are both bar-shaped on-load voltage regulating switches. Although the goals of voltage regulating gears and wide voltage regulation are achieved, their application in three-dimensional wound iron core distribution transformers will greatly increase the volume of on-load voltage regulating distribution transformers, and the inconvenience of their installation and wiring will increase the risk of hidden dangers. Summary of the invention

[0004] The purpose of the present invention is to provide an on-load voltage regulating switch and an on-load voltage regulating distribution transformer, which solves the problem of the on-load voltage regulating distribution transformer in the prior art that requires regular maintenance due to on-load voltage regulation switching, realizes the long life and maintenance-free characteristics of the on-load voltage regulating switch, and makes its life cycle equal to the life of the distribution transformer body. At the same time, it solves the problem of the on-load voltage regulating switch in the prior art that the on-load voltage regulating switch is large in size and inconvenient to install, and realizes the miniaturization of the on-load voltage regulating switch. It adopts a disc structure and is suitable for distribution transformers of any structural type. It is the most suitable structural mode of the voltage regulating switch for three-dimensional coiled iron core transformers. It is installed in the distribution transformer, and it is almost unnecessary to change the volume and shape of the conventional distribution transformer for installation.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: An on-load voltage regulating switch, characterized in that it is an on-load voltage regulating switch of a three-part disc structure, comprising a driving mechanism, a mounting main board, and an actuator; The driving mechanism includes a driving motor, a gearbox, and a driving bevel gear; The actuator has three phases, and each phase of the actuator can form an independent component structure, and independently complete the selection and switching of the three-phase voltage regulation gear; The three-phase actuator is installed and fixed in three equal parts below the mounting mainboard, and the driving mechanism is fixedly installed above the mounting mainboard; The actuator of each phase includes a transmission mechanism, a selection switch component, a switching switch component, and a transition element; The transmission mechanism of each phase comprises a transmission bevel gear and a transmission square shaft, and the transmission bevel gear is fixedly mounted on the transmission square shaft; The square transmission shaft of each phase passes through the selection switch assembly and the switching switch assembly of each phase; The driving motor drives the driving bevel gear with the aid of the gearbox, and the driving bevel gear drives the three-phase transmission bevel gear to rotate, and the transmission bevel gear of each phase drives the corresponding transmission square shaft of each phase to rotate, and the transmission square shaft of each phase drives the corresponding selection switch assembly and the switching switch assembly of each phase to have a timed action to complete the conversion of the voltage regulation gear.

[0006] According to a preferred embodiment of the present invention, the switching switch assembly of each phase includes a switching switch mounting substrate, two vacuum interrupter chambers, and two cams; the switching switch mounting substrate is sleeved on the transmission square shaft, the two cams are sleeved and fixed on the transmission square shaft, and the vacuum interrupter chamber is mounted and fixed on the switching switch mounting substrate; the transmission bevel gear drives the transmission square shaft to rotate, and the transmission square shaft drives the two cams to have a timed movement, and then respectively drives the two vacuum interrupter chambers to have a timed on and off, thereby completing the switching of the on-load voltage regulating switch.

[0007] According to a preferred embodiment of the present invention, the selection switch assembly of each phase includes a selection switch mounting base plate, two sets of groove wheel mechanisms, a selection contact assembly, and a selection conversion assembly, and the groove wheel mechanism includes a dial and a groove wheel; the selection switch mounting base plate is sleeved on the transmission square shaft; the two dials are located on both sides of the selection switch mounting base plate and are sleeved and fixed on the transmission square shaft; the transmission bevel gear drives the transmission square shaft to rotate, the transmission square shaft drives the dial to move, the dial drives the groove wheel to move and then drives the selection contact assembly to move, thereby completing the selection of the voltage regulating switch.

[0008] According to a preferred embodiment of the present invention, the selection contact assembly includes two moving contacts and a static contact group, the static contact group includes a plurality of static contacts, the number of the static contacts corresponds to the number of teeth of the groove wheel, the two moving contacts are respectively mounted and fixed on the two groove wheels, and the movement of the groove wheel drives the moving contact to select the corresponding static contact for electrical connection.

[0009] According to a preferred embodiment of the present invention, the selection conversion assembly includes a selection conversion substrate, a conversion connection mechanism, three conversion static contacts, and a selection conversion transmission mechanism. The selection conversion substrate is fixedly connected to the selection switch mounting substrate through a fixing column, the conversion static contact is mounted and fixed on the selection conversion substrate, the selection conversion transmission mechanism is mounted and fixed on one side of the selection switch mounting substrate, the conversion connection mechanism is connected to the selection conversion transmission mechanism, the groove wheel drives the selection conversion transmission mechanism to move, the selection conversion transmission mechanism drives the conversion connection mechanism to move, and the conversion connection mechanism selects two adjacent conversion static contacts among the three conversion static contacts for electrical connection to complete the selection conversion.

[0010] According to a preferred embodiment of the present invention, the groove wheel is provided with a conversion drive tooth, and when the conversion drive tooth moves to engage with the selection conversion transmission mechanism, the selection conversion transmission mechanism is driven to operate.

[0011] According to a preferred implementation manner of the present invention, an insulating shell of a corresponding shape is arranged outside the actuator of each phase.

[0012] According to a preferred embodiment of the present invention, if the actuator adopts only one phase, a single-phase on-load voltage regulating switch can be formed.

[0013] An on-load voltage-regulating distribution transformer, characterized in that it is an on-load voltage-regulating distribution transformer using any of the on-load voltage-regulating switches described above.

[0014] Compared with the prior art, the beneficial effect of the present invention is that an on-load voltage regulating switch and an on-load voltage regulating distribution transformer are invented. The on-load voltage regulating switch is suitable for distribution transformers of any structure, especially three-dimensional wound iron core transformers. When installed in a distribution transformer, the shape and volume of the conventional distribution transformer are hardly changed, which greatly reduces the production cost and installation and wiring hazards increased by the large volume or structural shape of the switch; at the same time, the present invention also realizes the wide-range voltage regulation of the distribution transformer, which can achieve 17 levels of ±8×2.5% wide-range voltage regulation or 9 levels of ±4×5% or ±4×2.5% voltage regulation, and can achieve more than 600,000 trouble-free, maintenance-free continuous voltage regulation actions, which can be maintenance-free within the life cycle of the distribution transformer, thereby improving the reliability of the on-load voltage regulation of the distribution transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram A of the overall structure of an on-load voltage regulating switch of the present invention; Figure 2 This is a schematic diagram B of the overall structure of an on-load voltage regulating switch of the present invention (the driving mechanism and the mounting main board are separated); Figure 3It is a structural schematic diagram of a three-phase transmission mechanism of an on-load voltage regulating switch of the present invention; Figure 4 It is a structural schematic diagram of a three-phase actuator of an on-load voltage regulating switch of the present invention; Figure 5 This is a structural schematic diagram A of a single-phase actuator of an on-load voltage regulating switch of the present invention (without the outer shell); Figure 6 This is a structural schematic diagram B of a single-phase actuator of an on-load voltage regulating switch of the present invention (without the outer shell); Figure 7 It is a schematic diagram of a selection switch assembly (including a selection conversion assembly) of an on-load voltage regulating switch of the present invention; Figure 8 The utility model is a schematic diagram of the principle of an on-load voltage regulating switch of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings. The embodiments described below are only used to more clearly illustrate the technical solution of the present invention. They are selected embodiments of the present invention, not all embodiments, and cannot be used to limit the scope of protection of the present invention. All other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0017] See also Figures 1 to 7 The present invention discloses an on-load voltage-regulating switch, which is a wide-width on-load voltage-regulating switch with a three-part disc structure, which can realize 9-speed and 17-speed voltage regulation. The on-load voltage-regulating switch of the present invention comprises a driving mechanism 1, a mounting main board 2, and an actuator 3; the driving mechanism comprises a driving motor 1.1, a gearbox 1.2, and a driving bevel gear 1.3; the driving motor 1.1 adopts a servo motor, and the gearbox 1.2 adopts a disc design structure; the actuator 3 has three phases, and an insulating shell 30 of a corresponding shape is arranged outside each phase actuator 3; the three-phase actuator 3 is installed and fixed in three parts below the mounting main board 2, and the driving mechanism 1 is fixedly installed above the mounting main board 2; the actuator 3 of each phase can form an independent component structure, that is, an independent module, and under the drive of the driving mechanism 1, the three-phase actuator 3 can independently complete the selection and switching of the three-phase voltage regulation gears.

[0018] Each phase actuator 3 includes a transmission mechanism 3.1, a selection switch assembly 3.2, a switching switch assembly 3.3, and a transition element 3.4; the transmission mechanism 3.1 includes a transmission bevel gear 3.1.1 and a transmission square shaft 3.1.2; each phase selection switch assembly 3.2 includes a selection switch mounting base plate 3.2.1, two sets of groove wheel mechanisms 3.2.2, and a selection contact assembly 3.2.3, each set of groove wheel mechanisms 3.2.2 includes a dial 3.2.2.1 and a groove wheel 3.2.2.2, and the groove wheel 3.2.2.2 has 9 wheels; each phase selection contact assembly 3.2.3 includes two moving contacts 3.2.3.1 and a stationary contact assembly 3.2.3.2, and the stationary contact assembly 3.2.3.2 includes a plurality of stationary contacts, the number of which corresponds to the number of teeth on the groove wheel 3.2.2.2, and the two moving contacts 3.2.3.1 are respectively mounted and fixed on the two groove wheels 3.2.2.2. Each phase transfer switch assembly 3.3 includes a transfer switch mounting substrate 3.3.1, two sets of cams 3.3.2, 3.3.3, and two sets of vacuum interrupters 3.3.4, 3.3.5; each phase transmission square shaft 3.1.2 runs through each phase selection switch assembly 3.2 and each phase transfer switch assembly 3.3; the selection switch mounting substrate 3.2.1 and the transfer switch mounting substrate 3.3.1 are mounted on the transmission square shaft 3.1.2, the transmission bevel gear 3.1.1, and two dials 3.2. 2.1, two cams 3.3.2, 3.3.3 are set and fixed on the transmission square shaft 3.1.2; two sets of groove wheel mechanisms 3.2.2 are respectively located on both sides of the selection switch mounting base plate 3.2.1, two sets of cams 3.3.2, 3.3.3, two sets of vacuum interrupters 3.3.4, 3.3.5 are located on the same side of the switching switch mounting base plate 3.3.1, and two sets of vacuum interrupters 3.3.4, 3.3.5 are installed and fixed on the switching switch mounting base plate 3.3.1.

[0019] The driving motor 1.1 drives the driving bevel gear 1.3 to rotate with the aid of the gearbox 1.2. The driving bevel gear 1.3 rotates and drives the three transmission bevel gears 3.1.1 of the three phases to rotate. The rotation of the transmission bevel gear 3.1.1 of each phase drives the corresponding transmission square shaft 3.1.2 of each phase to rotate. The transmission square shaft 3.1.2 of each phase drives the corresponding selection switch assembly 3.2 and the switching switch assembly 3.3 of each phase to have a timed action to complete the conversion of the voltage regulating gear. Specifically, the transmission square shaft 3.1.2 of each phase drives the two The dial 3.2.2.1 and the two cams 3.3.2 and 3.3.3 move in sequence. The two dials 3.2.2.1 respectively drive the two groove wheels 3.2.2.2 to move, and the two groove wheels 3.2.2.2 drive the two moving contacts 3.2.3.1 to move and select the corresponding static contacts to complete the voltage adjustment selection; the two cams 3.3.2 and 3.3.3 respectively drive the two vacuum interrupters 3.3.4 and 3.3.5 to be turned on and off to complete the switching of the voltage adjustment; finally, the conversion of the voltage adjustment gear is completed.

[0020] The above is the description of achieving 9-speed voltage regulation. To achieve 17-speed voltage regulation, an additional set of selection conversion components 3.2.4 is required. The selection conversion component 3.2.4 includes a selection conversion substrate 3.2.4.1, a conversion connection mechanism 3.2.4.2, three conversion static contacts 3.2.4.3, 3.2.4.4, 3.2.4.5, and a selection conversion transmission mechanism 3.2.4.6. The selection conversion substrate 3.2.4.1 is fixedly connected to the selection switch mounting substrate 3.2.1 through a fixing column. The selection conversion transmission mechanism 3.2.4.6 is installed on one side of the selection switch mounting substrate 3.2.1. On the other side, the conversion driving tooth 300 arranged on the groove wheel 3.2.2.2 moves to engage with the selection conversion transmission mechanism 3.2.4.6 to drive it to move, and the selection conversion transmission mechanism 3.2.4.6 drives the conversion connection mechanism 3.2.4.2 to select two of the three conversion static contacts 3.2.4.3, 3.2.4.4, and 3.2.4.5 (3.2.4.3 is connected with 3.2.4.4 or 3.2.4.4 is connected with 3.2.4.5) to connect, forming a conversion selection, realizing the positive and negative selection or coarse and fine selection of positive and negative voltage regulation or coarse and fine voltage regulation, and realizing 17 gears of on-load voltage regulation.

[0021] The above is a three-phase on-load voltage regulating switch. If a single-phase on-load voltage regulating switch is used, two phases of the three-phase actuator can be removed to achieve single-phase on-load voltage regulation.

[0022] See also Figure 8 The present invention is a schematic diagram of the principle of an on-load voltage regulating switch, in which P1 and P2 are two moving contacts in the selection contact assembly, G1 and G2 are two vacuum interrupters, R is a transition resistor, K, K1, K2 are switching static contacts, 1, 2, 3, ... 9 are tapping points in the voltage regulating coil correspondingly connected to the static contacts in the on-load voltage regulating switch, P1 and G1 are the voltage regulating main circuits, P2, R, G2 are the voltage regulating transition circuits, and during the voltage regulating gear conversion process, at least one of the voltage regulating main circuit and the voltage regulating transition circuit is in the connected state, Maintain continuous stability of voltage; K, K1, and K2 are conversion circuits. When performing 17-speed voltage regulation, the conversion circuit is used for positive and negative conversion or coarse and fine conversion, and the 9-speed linear voltage regulation is achieved by adding a selection conversion component to achieve 17-speed voltage regulation; the tap 9 in the figure and the other end of K1 and K2 are connected to the corresponding coil winding or the tap corresponding to the voltage regulating winding according to the selected positive and negative voltage regulation principle or coarse and fine voltage regulation principle; the detailed gear adjustment steps are no longer described in detail here, and technicians in this technical field can clearly know the corresponding voltage regulation action principle based on the schematic diagram.

[0023] When designing the on-load voltage regulating switch, the present invention is developed from the technical points and actual needs such as the disc-type structure, independent action of the three-phase transmission mechanism, miniaturization, and no maintenance during the life cycle. At the same time, the voltage regulating gear can achieve a wide voltage regulation of 17 gears. The structural design is simple and compact, and the single-phase modular structural design is realized, which greatly reduces the size of the switch. Modular change optimization design can be performed according to different application requirements. The wide-range on-load voltage regulating switch with a disc-type structure is suitable for any distribution transformer, especially for three-dimensional wound iron core distribution transformer. When used in three-dimensional wound core distribution transformers, there is almost no need to change the shape or volume of conventional non-excitation distribution transformers, which saves installation and application costs. The three phases of the on-load voltage regulator are installed in a corresponding angle direction to the three phases of the core coil, and the installation is simple and reliable. Two sets of vacuum arc extinguishing chambers are used for each phase to switch the main circuit and the transition circuit respectively. The vacuum isolating switch contacts do not pollute the transformer oil, and the two sets of switching also greatly increase the service life of the switch. A flexible motor drive is used, and the drive transmission is impact-free, so that the life of the on-load voltage regulator can reach the same as the life of the distribution transformer body. Improvements can be made in the technical field according to the preferred embodiments of the present invention. For example, other gear numbers (less than 9 gears or more than 17 gears) can also be improved and implemented in the manner of the present invention, which also belongs to the protection scope of the present invention.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the technical principles of the present invention. These changes and improvements should also be regarded as the scope of protection of the present invention.

Claims

1. An on-load voltage regulating switch, characterized in that: It is a three-part disc-type on-load voltage regulating switch, including a driving mechanism, a mounting main board, and an actuator; The driving mechanism includes a driving motor, a gearbox, and a driving bevel gear; The actuator has three phases, and each phase of the actuator can form an independent component structure, and independently complete the selection and switching of the three-phase voltage regulation gear; The three-phase actuator is installed and fixed in three equal parts below the mounting mainboard, and the driving mechanism is fixedly installed above the mounting mainboard; The actuator of each phase includes a transmission mechanism, a selection switch component, a switching switch component, and a transition element; The transmission mechanism of each phase comprises a transmission bevel gear and a transmission square shaft, and the transmission bevel gear is fixedly mounted on the transmission square shaft; The square transmission shaft of each phase passes through the selection switch assembly and the switching switch assembly of each phase; The driving motor drives the driving bevel gear with the aid of the gearbox, and the driving bevel gear drives the three-phase transmission bevel gear to rotate, and the transmission bevel gear of each phase drives the corresponding transmission square shaft of each phase to rotate, and the transmission square shaft of each phase drives the corresponding selection switch assembly and the switching switch assembly of each phase to have a timed action to complete the conversion of the voltage regulation gear.

2. The on-load voltage regulating switch according to claim 1, characterized in that: The switching switch assembly of each phase includes a switching switch mounting substrate, two vacuum interrupters, and two cams; the switching switch mounting substrate is sleeved on the transmission square shaft, the two cams are sleeved and fixed on the transmission square shaft, and the vacuum interrupter is mounted and fixed on the switching switch mounting substrate; the transmission bevel gear drives the transmission square shaft to rotate, and the transmission square shaft drives the two cams to have a timed movement, and then respectively drives the two vacuum interrupters to have a timed on and off, thereby completing the switching of the on-load voltage regulating switch.

3. The on-load voltage regulating switch according to claim 1, characterized in that: The selection switch assembly of each phase includes a selection switch mounting base, two sets of groove wheel mechanisms, a selection contact assembly, and a selection conversion assembly. The groove wheel mechanism includes a dial and a groove wheel; the selection switch mounting base is sleeved on the transmission square shaft; the two dials are located on both sides of the selection switch mounting base, and are sleeved and fixed on the transmission square shaft; the transmission bevel gear drives the transmission square shaft to rotate, the transmission square shaft drives the dial to move, the dial drives the groove wheel to move and then drives the selection contact assembly to move, so as to complete the selection of the voltage regulating switch.

4. The on-load voltage regulating switch according to claim 3, characterized in that: The selection contact assembly includes two moving contacts and a stationary contact group. The stationary contact group includes a plurality of stationary contacts. The number of the stationary contacts corresponds to the number of teeth of the groove wheel. The two moving contacts are respectively mounted and fixed on the two groove wheels. The movement of the groove wheel drives the moving contact to select the corresponding stationary contact for electrical connection.

5. The on-load voltage regulating switch according to claim 3, characterized in that: The selection conversion assembly includes a selection conversion substrate, a conversion connection mechanism, three conversion static contacts, and a selection conversion transmission mechanism. The selection conversion substrate is fixedly connected to the selection switch mounting substrate through a fixing column. The conversion static contact is mounted and fixed on the selection conversion substrate. The selection conversion transmission mechanism is mounted and fixed on one side of the selection switch mounting substrate. The conversion connection mechanism is connected to the selection conversion transmission mechanism. The groove wheel on the same side drives the selection conversion transmission mechanism to move. The selection conversion transmission mechanism drives the conversion connection mechanism to move. The conversion connection mechanism selects two adjacent conversion static contacts among the three conversion static contacts for electrical connection to complete the selection conversion.

6. The on-load voltage regulating switch according to claim 5, characterized in that: The groove wheel is provided with a conversion driving tooth, and when the conversion driving tooth moves to engage with the selection conversion transmission mechanism, the selection conversion transmission mechanism is driven to operate.

7. The on-load voltage regulating switch according to claim 1, characterized in that: An insulating shell of corresponding shape is arranged outside the actuator of each phase.

8. The on-load voltage regulating switch according to claim 1, characterized in that: If the actuator adopts only one phase, a single-phase on-load voltage regulating switch can be formed.

9. An on-load voltage-changing distribution transformer, characterized in that: An on-load tap-changing distribution transformer using the on-load tap-changing switch according to any one of the preceding claims.

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