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

Abstract

The utility model 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, the execution mechanism has three phases, and the installation main board is arranged on the installation main board. 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 power products, in particular to a load-voltage-regulating switch and a load-voltage-regulating distribution transformer. BACKGROUND

[0002] The distribution transformer is the last stage transformer of the power supply network, is applied to various fields of state economy and people's livelihood, is widely distributed in every corner of cities and towns, and has a large quantity. The active distribution transformer is of no-field voltage regulation mode, and needs to cut off the power supply first, then manually adjusts the no-field voltage regulation switch, and restores the power supply after the adjustment is completed. Since the power supply needs to be cut off to regulate the voltage, and the voltage cannot be regulated in time, the distribution transformer in the actual power supply network is equivalent to having no voltage regulation measure, so that the qualified rate of the power supply voltage is low, the stability is poor, the electric equipment runs abnormally, and the loss of the distribution transformer itself and the electric equipment is increased. In recent years, with the continuous improvement and development of social economy and the power grid, the energy efficiency of the transformer is higher and higher, and the three-dimensional wound core distribution transformer gradually becomes one of the mainstream distribution transformers,

[0003] With the increasing demand for load-voltage-regulating distribution transformers, the reliability requirement is also higher and higher. Most of the load-voltage-regulating switches on the market are strip-shaped load-voltage-regulating switches, which are not particularly suitable for the three-dimensional wound core distribution transformer with triangular distribution of the core and the coil, and the 5-grade disc type load-voltage-regulating switch appears on the market, but with the continuous access of new energy, the voltage regulation range cannot meet the demand of users. In order to meet the demand of different occasions, the demand for the number of voltage regulation positions and the wide range of voltage regulation of the load-voltage-regulating distribution transformer will also increase, and the structure of the load-voltage-regulating switch corresponding to the distribution of the core and the coil of the distribution transformer is also needed.

[0004] The German MR company has applied for the following Chinese invention patents in China: 1. Application No. 201780005054.9, entitled "On-load tap changer"; 2. Application No. 201780007088.1, entitled "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 selection assembly and switching assembly structure and action of the on-load tap changer, and do not describe the driving transmission mechanism thereof, and it can also be seen from the drawings of the above patents that the on-load tap changer is a bar-shaped structure. The Jinan Edison Electrical Equipment Co., Ltd. has applied for the following Chinese invention patents: 1. Application No. 201811188811.3, entitled "Special on-load voltage regulating switch for distribution transformer and on-load voltage regulating distribution transformer"; 2. Application No. 201910056946.2, entitled "Special on-load voltage regulating switch for distribution transformer and on-load voltage regulating distribution transformer". It can be seen from the drawings of the above two invention patents that the design scheme is a bar-shaped on-load voltage regulating switch, which achieves the target of regulating voltage range and wide range of voltage regulation, but when applied to a three-dimensional wound core distribution transformer, the volume of the on-load voltage regulating distribution transformer is greatly increased, and the installation wiring is not convenient, which increases the risk of hidden dangers. SUMMARY

[0005] The utility model aims at providing a kind of on-load voltage regulating switch and on-load voltage regulating distribution transformer, solve the problem that on-load voltage regulating distribution transformer in prior art needs to be maintained periodically due to on-load voltage regulating switching, realize the long life, maintenance-free characteristics of on-load voltage regulating switch, make its life cycle equivalent to the life of distribution transformer body. While solving the problem that on-load voltage regulating switch in prior art is large in size and inconvenient to install, realize the miniaturization of on-load voltage regulating switch, it adopts disc type structure, is suitable for any structure type distribution transformer, is the most suitable structure mode of voltage regulating switch of three-dimensional wound core transformer, it is installed in distribution transformer, almost need not change the volume and shape of conventional distribution transformer for installation.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] An on-load voltage regulating switch, characterized in that it is a three-equal-part disc type structure on-load voltage regulating switch, comprising a driving mechanism, a mounting main plate and an execution mechanism.

[0008] The driving mechanism comprises a driving motor, a gearbox and a driving bevel gear.

[0009] The execution mechanism has three phases, and each phase of the execution mechanism can form an independent assembly structure to independently complete the selection and switching of three-phase voltage regulating positions.

[0010] Three-phase said actuator three equal parts are fixedly installed below the installation mainboard, and the driving mechanism is fixedly installed above the installation mainboard;

[0011] Each phase said actuator includes transmission mechanism, selection switch assembly, switching switch assembly, transition element;

[0012] Each phase said transmission mechanism includes transmission bevel gear, transmission square shaft, and the transmission bevel gear is sleeved and fixed on the transmission square shaft;

[0013] Each phase said transmission square shaft penetrates each phase said selection switch assembly and said switching switch assembly;

[0014] The driving motor drives the driving bevel gear through the gearbox, the driving bevel gear drives the three-phase transmission bevel gear to rotate, each phase said transmission bevel gear drives the corresponding each phase said transmission square shaft to rotate, and each phase said transmission square shaft drives the corresponding each phase said selection switch assembly, said switching switch assembly to have a time sequence action, so that the conversion of the voltage regulating gear is completed.

[0015] According to a preferred embodiment of the utility model, each phase said switching switch assembly includes switching switch installation base plate, two vacuum arc-extinguishing chambers and two cams, the switching switch installation base plate is sleeved on the transmission square shaft, the two cams are sleeved and fixed on the transmission square shaft, and the vacuum arc-extinguishing chambers are fixedly installed on the switching switch installation base plate; the transmission bevel gear drives the transmission square shaft to rotate, the transmission square shaft drives the two cams to have a time sequence action, in turn drives the two vacuum arc-extinguishing chambers to have a time sequence on-off, and the switching of the on-load voltage regulating switch is completed.

[0016] According to a preferred embodiment of the utility model, each phase said selection switch assembly includes selection switch installation base plate, two groups of groove wheel mechanisms, selection contact assembly and selection conversion assembly, the groove wheel mechanism includes dial and groove wheel; the selection switch installation base plate is sleeved on the transmission square shaft; two dials are located on the two sides of the selection switch installation 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 act, the dial drives the groove wheel to act in turn and drives the selection contact assembly to act, and the selection of the voltage regulating switch is completed.

[0017] According to a preferred embodiment of the utility model, the selection contact assembly includes two moving contacts and static contact group, the static contact group includes a plurality of static contacts, the number of static contacts corresponds to the number of teeth of the groove wheel, two moving contacts are fixedly installed on two groove wheels respectively, and the groove wheel action drives the moving contact to select the corresponding static contact to be electrically connected.

[0018] According to the preferred embodiment of the utility model, the selection conversion assembly comprises a selection conversion substrate, a conversion connecting mechanism, three conversion static contacts and a selection conversion transmission mechanism, the selection conversion substrate is fixedly connected with the selection switch mounting substrate through fixing columns, the conversion static contacts are fixedly installed on the selection conversion substrate, the selection conversion transmission mechanism is fixedly installed on one side of the selection switch mounting substrate, the conversion connecting mechanism is connected with the selection conversion transmission mechanism, the selection conversion transmission mechanism is driven by the groove wheel to act, the selection conversion transmission mechanism drives the conversion connecting mechanism to act, the conversion connecting mechanism electrically connects adjacent two conversion static contacts among the three conversion static contacts, and the selection conversion is completed.

[0019] According to the preferred embodiment of the utility model, the conversion driving tooth is arranged on the groove wheel, when the conversion driving tooth is moved to engage with the selection conversion transmission mechanism, the selection conversion transmission mechanism is driven to act.

[0020] According to the preferred embodiment of the utility model, an insulating shell with a corresponding shape is arranged outside each phase of the execution mechanism.

[0021] According to the preferred embodiment of the utility model, if only one phase is used for the execution mechanism, a single-phase on-load voltage regulating switch can be formed.

[0022] An on-load voltage regulating power distribution transformer, characterized in that the on-load voltage regulating power distribution transformer adopts the on-load voltage regulating switch of any one of the preceding.

[0023] Compared with the prior art, the utility model has the beneficial effects that an on-load voltage regulating switch and an on-load voltage regulating power distribution transformer are provided, the on-load voltage regulating switch is suitable for any structure of power distribution transformer, especially a three-dimensional winding core transformer, is installed in the power distribution transformer and hardly changes the shape and volume of the conventional power distribution transformer, greatly reduces the production cost and installation wiring hidden danger caused by the large volume or structure shape of the switch, simultaneously, the utility model also realizes wide-range voltage regulation of the power distribution transformer, can realize 17 grades of ±8x2.5% wide-range voltage regulation or 9 grades of ±4x5% or ±4x2.5% voltage regulation, can realize more than 600,000 times of fault-free, maintenance-free continuous voltage regulation action, can realize maintenance-free in the life cycle of the power distribution transformer, and improves the reliability of on-load voltage regulation of the power distribution transformer. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the whole structure schematic view A of the utility model one kind of on-load voltage regulating switch;

[0025] Figure 2 It is the whole structure schematic view B (driving mechanism and installation mainboard split) of the utility model one kind of on-load voltage regulating switch;

[0026] Figure 3 is a schematic view of a three-phase transmission mechanism structure of the load regulating switch of the utility model;

[0027] Figure 4 is a schematic view of a three-phase transmission mechanism structure of the load regulating switch of the utility model;

[0028] Figure 5 is a schematic view of a single-phase transmission mechanism structure A (without shell) of the load regulating switch of the utility model;

[0029] Figure 6 is a schematic view of a single-phase transmission mechanism structure B (without shell) of the load regulating switch of the utility model;

[0030] Figure 7 is a schematic view of a selection switch assembly (including a selection conversion assembly) of the load regulating switch of the utility model;

[0031] Figure 8 is a schematic view of the load regulating switch of the utility model. DETAILED DESCRIPTION

[0032] The utility model will be further described below in combination with the drawings. The embodiments described below are only used to more clearly illustrate the technical scheme of the utility model, and are selected embodiments of the utility model, but not all embodiments, and cannot limit the protection scope of the utility model. All other embodiments obtained by the person skilled in the art without making creative efforts belong to the protection scope of the utility model.

[0033] Referring to Figures 1 to 7 The utility model discloses a kind of load regulating switches, it is a three-equal division disc type structure wide load regulating switch, it can realize 9 grades and 17 grades of voltage regulation, the load regulating switch of the utility model includes driving mechanism 1, installation mainboard 2, transmission mechanism 3;Driving mechanism includes driving motor 1.1, gearbox 1.2, driving umbrella tooth 1.3;Driving motor 1.1 uses servo motor, gearbox 1.2 uses the design structure of disc;Transmission mechanism 3 has three phases, and each phase transmission mechanism 3 is provided with the corresponding shape insulation shell 30 outside;Three-phase transmission mechanism 3 is installed and fixed below installation mainboard 2, driving mechanism 1 is fixedly installed on installation mainboard 2 upper side;The transmission mechanism 3 of each phase can form an independent assembly structure, i.e. an independent module, under the driving of driving mechanism 1, three-phase transmission mechanism 3 can independently complete three-phase voltage regulation gear position selection and switching respectively.

[0034] Each phase actuator 3 includes transmission mechanism 3.1, selection switch assembly 3.2, switching switch assembly 3.3, transition element 3.4; transmission mechanism 3.1 includes transmission bevel gear 3.1.1, transmission square shaft 3.1.2; each phase selection switch assembly 3.2 includes selection switch mounting base plate 3.2.1, two sets of Geneva mechanism 3.2.2, selection contact assembly 3.2.3, each set of Geneva mechanism 3.2.2 includes dial 3.2.2.1, Geneva wheel 3.2.2.2, Geneva wheel 3.2.2.2 has 9 wheels; each phase selection contact assembly 3.2.3 includes two moving contacts 3.2.3.1, stationary contact assembly 3.2.3.2, stationary contact assembly 3.2.3.2 contains a plurality of stationary contacts, the number of stationary contacts corresponds to the number of teeth on the Geneva wheel 3.2.2.2, two moving contacts 3.2.3.1 are respectively mounted and fixed on two Geneva wheels 3.2.2.2. Each phase switching switch assembly 3.3 includes switching switch mounting base plate 3.3.1, two sets of cam 3.3.2, 3.3.3, two sets of vacuum interrupter 3.3.4, 3.3.5; the transmission square shaft 3.1.2 of each phase penetrates each phase selection switch assembly 3.2 and each phase switching switch assembly 3.3; selection switch mounting base plate 3.2.1, switching switch mounting base plate 3.3.1 are sleeved on transmission square shaft 3.1.2, transmission bevel gear 3.1.1, two dials 3.2.2.1, two cams 3.3.2, 3.3.3 are sleeved and fixed on transmission square shaft 3.1.2; two sets of Geneva mechanism 3.2.2 are respectively located on both sides of selection switch mounting base plate 3.2.1, two sets of cam 3.3.2, 3.3.3, two sets of vacuum interrupter 3.3.4, 3.3.5 are located on the same side of switching switch mounting base plate 3.3.1, two sets of vacuum interrupter 3.3.4, 3.3.5 are mounted and fixed on switching switch mounting base plate 3.3.1.

[0035] The driving motor 1.1 drives the driving bevel gear 1.3 to rotate through the gearbox 1.2, the driving bevel gear 1.3 drives the three transmission bevel gears 3.1.1 of the three phases to rotate, the transmission bevel gear 3.1.1 of each phase drives the transmission square shaft 3.1.2 corresponding to each phase to rotate, the transmission square shaft 3.1.2 of each phase drives the selection switch assembly 3.2 and the switching switch assembly 3.3 corresponding to each phase to act in sequence, completing the conversion of the voltage regulation gear; specifically, the transmission square shaft 3.1.2 of each phase drives the two dials 3.2.2.1, the two cams 3.3.2, 3.3.3 of each phase to act in sequence, the two dials 3.2.2.1 respectively drive the two Geneva wheels 3.2.2.2 to act, the two Geneva wheels 3.2.2.2 drive the two moving contacts 3.2.3.1 to act to select the corresponding stationary contacts, completing the selection of voltage regulation; the two cams 3.3.2, 3.3.3 respectively drive the on-off of the two vacuum interrupters 3.3.4, 3.3.5, completing the switching of voltage regulation; finally, the conversion of the voltage regulation gear is completed.

[0036] The above describes the implementation of 9-level voltage regulation. To achieve 17-level voltage regulation, an additional selection conversion assembly 3.2.4 is required. The selection conversion assembly 3.2.4 includes a selection conversion base plate 3.2.4.1, a conversion connection mechanism 3.2.4.2, three conversion stationary contacts 3.2.4.3, 3.2.4.4, and 3.2.4.5, and a selection conversion transmission mechanism 3.2.4.6. The selection conversion base plate 3.2.4.1 is fixedly connected to the selector switch mounting base plate 3.2.1 via a fixing post. The selection conversion transmission mechanism 3.2.4.6 is mounted on one of the selector switch mounting base plates 3.2.1. On the side, the conversion drive tooth 300 on the grooved wheel 3.2.2.2 moves to engage with the selection conversion transmission mechanism 3.2.4.6, driving it to move. 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 stationary contacts 3.2.4.3, 3.2.4.4, and 3.2.4.5 (3.2.4.3 and 3.2.4.4 are connected, or 3.2.4.4 and 3.2.4.5 are connected) to form a conversion selection, realizing forward and reverse voltage regulation or coarse and fine voltage regulation, and realizing 17 on-load voltage regulation.

[0037] The above describes a three-phase on-load tap changer. If a single-phase on-load tap changer is used, two phases of the three-phase actuator can be removed to achieve single-phase on-load tap regulation.

[0038] See Figure 8 This is a schematic diagram of the principle of an on-load tap changer according to this utility model. In the diagram, P1 and P2 are two moving contacts in the selector contact assembly, G1 and G2 are two vacuum interrupters, R is a transition resistor, K, K1, and K2 are switching stationary contacts, and 1, 2, 3...9 are taps in the voltage regulating coil that are connected to the stationary contacts in the on-load tap changer. In the diagram, P1 and G1 are the main voltage regulating circuit, and P2, R, and G2 are the voltage regulating transition circuits. During the voltage regulation range switching process, at least one circuit of the main voltage regulating circuit and the voltage regulating transition circuit is in a connected state. To maintain continuous and stable voltage; K, K1, and K2 form a conversion circuit. When performing 17-level voltage regulation, the conversion circuit is used to perform forward / reverse conversion or coarse / fine conversion, transforming the 9-level linear voltage regulation into 17-level voltage regulation by adding a selection conversion component; in the diagram, tap 9 and the other end of K1 and K2 are connected to the corresponding coil winding or voltage regulating winding tap according to the selected forward / reverse voltage regulation principle or coarse / fine voltage regulation principle; detailed adjustment steps are not described here, and those skilled in the art can clearly understand the corresponding voltage regulation action principle based on the schematic diagram.

[0039] The utility model discloses a wide range load regulation switch of disc type structure, which is characterized by the following technical points: the switch is designed in a disc type, three-phase transmission mechanism independent action, miniaturization, no maintenance in life cycle, etc. The switch can realize 17 wide range regulation, and the structure is simple and compact. The switch is single-phase modular structure, which greatly reduces the size of the switch. The switch can be optimized and designed in a modular way according to different application requirements. The wide range load regulation switch of disc type structure is suitable for any distribution transformer, especially for three-dimensional winding core distribution transformer. The switch is almost not required to change the shape or size of the conventional no excitation distribution transformer, which saves the installation and application cost. The three-phase angle direction of the load regulation switch corresponds to the installation of the three-phase core coil, which is simple and reliable. Each phase of the switch selects two groups of vacuum arc-extinguishing chambers to switch the main circuit and the transition circuit. The vacuum switch contact does not pollute the transformer oil, and the two groups of switches greatly improve the service life of the switch. The flexible motor drive is adopted, and the driving transmission is not impacted, so that the service life of the load regulation switch can be equivalent to the service life of the distribution transformer. The utility model can be improved according to the preferred embodiments, for example, other number of gears (9 gears or more than 17 gears) can also be improved according to the utility model, which also belongs to the protection scope of the utility model.

[0040] The above is only the preferred embodiment of the utility model, and it should be pointed out that for the person skilled in the art, without departing from the technical principles of the utility model, a number of changes and improvements can be made, and these changes and improvements should also be considered as the protection scope of the utility model.

Claims

1. A load regulation switch, characterized by The application discloses a three-equal-division disk type on-load voltage regulating switch which comprises a driving mechanism, a mounting main plate and an executing mechanism. The driving mechanism comprises a driving motor, a gearbox and driving bevel gears. The executing mechanism has three phases, each of which can form an independent component structure and independently complete selection and switching of three-phase voltage regulating gears. The three-phase executing mechanism is three-equal-division mounted and fixed below the mounting main plate, and the driving mechanism is fixed and mounted above the mounting main plate. Each phase of the executing mechanism comprises a transmission mechanism, a selection switch component, a switching switch component and a transition element. Each phase of the transmission mechanism comprises a transmission bevel gear and a transmission square shaft, and the transmission bevel gear is sleeved and fixed on the transmission square shaft. Each phase of the transmission square shaft penetrates through each phase of the selection switch component and the switching switch component. The driving motor drives the driving bevel gears through the gearbox, the driving bevel gears drive the three-phase transmission bevel gears to rotate, each phase of the transmission bevel gears drives the corresponding transmission square shaft to rotate, and each phase of the transmission square shaft drives the corresponding selection switch component and switching switch component to act in time sequence, thereby completing conversion of voltage regulating gears.

2. A load tap changer according to claim 1, characterized in that Each phase of the switching switch component comprises a switching switch mounting base plate, two vacuum arc-extinguishing chambers and two cams, the switching switch mounting base plate is sleeved on the transmission square shaft, the two cams are sleeved and fixed on the transmission square shaft, and the vacuum arc-extinguishing chambers are mounted and fixed on the switching switch mounting base plate; the transmission bevel gears drive the transmission square shaft to rotate, the transmission square shaft drives the two cams to act in time sequence, thereby respectively driving the two vacuum arc-extinguishing chambers to turn on and turn off in time sequence, and completing switching of the on-load voltage regulating switch.

3. A load regulation switch according to claim 1, wherein Each phase of the selection switch component comprises a selection switch mounting base plate, two groups of groove wheel mechanisms, a selection contact component and a selection conversion component, the groove wheel mechanism comprises a dial and a groove wheel; the selection switch mounting base plate is sleeved on the transmission square shaft; two dials are located on the two sides of the selection switch mounting base plate and are sleeved and fixed on the transmission square shaft; the transmission bevel gears drive the transmission square shaft to rotate, the transmission square shaft drives the dials to act, the dials drive the groove wheels to act, thereby driving the selection contact component to act, and completing selection of the voltage regulating switch.

4. A load regulating switch according to claim 3, wherein The selection contact component comprises two movable contacts and a static contact group, the static contact group comprises a plurality of static contacts, the number of the static contacts corresponds to the number of teeth of the groove wheels, the two movable contacts are respectively mounted and fixed on the two groove wheels, and the groove wheels drive the movable contacts to select corresponding static contacts to be electrically connected.

5. A load regulating switch according to claim 3, wherein The selection conversion assembly comprises a selection conversion substrate, a conversion connecting mechanism, three conversion static contacts, a selection conversion transmission mechanism, the selection conversion substrate is fixedly connected with the selection switch mounting substrate through fixing columns, the conversion static contacts are fixedly mounted on the selection conversion substrate, the selection conversion transmission mechanism is fixedly mounted on one side of the selection switch mounting substrate, the conversion connecting mechanism is connected with the selection conversion transmission mechanism, the selection conversion transmission mechanism is driven by the groove wheel to act, the selection conversion transmission mechanism drives the conversion connecting mechanism to act, the conversion connecting mechanism selects two adjacent conversion static contacts among the three conversion static contacts to be electrically connected, and the selection conversion is completed.

6. A load regulation switch according to claim 5, wherein the switch is a silicon carbide switch. The groove wheel is provided with a conversion driving tooth, when the conversion driving tooth is moved to engage with the selection conversion transmission mechanism, the selection conversion transmission mechanism is driven to act.

7. The load regulation switch according to claim 1, wherein An insulating shell with a corresponding shape is arranged outside the execution mechanism of each phase.

8. The load regulation switch according to claim 1, wherein If only one phase is used, a single-phase on-load voltage regulating switch can be formed.

9. A load-regulated distribution transformer, characterized in that An on-load voltage regulating distribution transformer adopting the on-load voltage regulating switch of any one of the preceding claims.

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