CN108987146B - Three-phase non-excitation tapping switch and transformer using same - Google Patents
Three-phase non-excitation tapping switch and transformer using same Download PDFInfo
- Publication number
- CN108987146B CN108987146B CN201810867000.XA CN201810867000A CN108987146B CN 108987146 B CN108987146 B CN 108987146B CN 201810867000 A CN201810867000 A CN 201810867000A CN 108987146 B CN108987146 B CN 108987146B
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- fixed
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- insulator spindle
- pull handle
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 34
- 230000005284 excitation Effects 0.000 title claims abstract description 17
- 230000003068 static effect Effects 0.000 claims abstract description 31
- 239000012212 insulator Substances 0.000 claims abstract description 25
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000000712 assembly Effects 0.000 description 11
- 238000000429 assembly Methods 0.000 description 11
- 238000004804 winding Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0016—Contact arrangements for tap changers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0027—Operating mechanisms
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Push-Button Switches (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The utility model relates to a three-phase non-excitation tapping switch and a transformer using the tapping switch. The transformer includes the transformer body and sets up the tapping switch on the transformer body, and the tapping switch includes the mount, be provided with three parallel interval arrangement's fixed insulator spindle on the mount, all be provided with the static contact group on each fixed insulator spindle, each static contact group all includes a plurality of static contacts of arranging along the extending direction interval of corresponding fixed insulator spindle, still all direction sliding fit has moving contact subassembly on each fixed insulator spindle, and each moving contact subassembly is all fixed on same connecting piece, still be provided with the push-pull handle on the static contact that is used for driving the connecting piece to remove in order to switch each moving contact subassembly to corresponding gear in step on the connecting piece. Through setting up each static contact group on different fixed insulator spindle, avoided each static contact group to adopt the mode of line type to arrange the condition that leads to fixed insulator spindle intensity to reduce, prolonged the life of tapping switch.
Description
Technical Field
The utility model relates to a three-phase non-excitation tapping switch and a transformer using the tapping switch.
Background
Transformers are an important type of electrical equipment that is used mainly to regulate the voltage across the grid system to a rated voltage. As the voltages are not exactly the same throughout the grid system, tapping switches are usually installed on the transformers in order to enable them to adjust the voltages throughout. The tapping switch is provided with a plurality of fixed contacts and movable contacts capable of freely moving, each fixed contact is respectively connected with taps connected with coils with different turns, and when voltage needs to be adjusted, the fixed contacts are switched to the fixed contacts of corresponding gears through sliding the movable contacts.
The tap switch in the prior art can be divided into a disc tap switch and a strip tap switch according to different switching modes, wherein the fixed contacts of the strip tap switch are arranged on a fixed insulating rod, the fixed contacts are arranged at intervals along the extending direction of the fixed insulating rod, and the moving contacts are slidingly assembled on the fixed insulating rod. For example, chinese patent publication No. CN205723180U discloses a non-excited bar tap changer, which includes a fixed insulating rod and a rack capable of sliding along the fixed insulating rod, the fixed insulating rod is provided with a stationary contact, and the rack is provided with a moving contact. Because the tapping switch in the patent document is a three-phase switch, three groups of fixed contact groups are arranged on the fixed insulating rod at intervals, each fixed contact group comprises six fixed contacts arranged at intervals, three moving contacts are arranged on the rack, each moving contact is respectively and correspondingly arranged on the corresponding fixed contact group, when voltage needs to be regulated, the rack slides through driving the rack, and each moving contact on the rack can be driven to slide, so that each moving contact is respectively switched with the fixed contact in the corresponding fixed contact group.
The fixed contacts of the prior bar switch mostly adopt the linear arrangement mode, so that the length of the fixed insulating rod is longer, the body type is longer, the structural strength is reduced, and the service life of the bar tapping switch is shortened. In addition, in order to avoid the overlong condition of the bar-type tapping switch, the distance between each static contact group in the bar-type tapping switch is generally relatively close, which can cause the phenomenon of electric breakdown to easily occur between adjacent static contact groups in the gear switching process, so that the electric protection level of the bar-type tapping switch is relatively low, and the safety operation is not facilitated.
Disclosure of Invention
The utility model aims to provide a three-phase non-excited tap switch, which is used for solving the technical problems of low strength and electric protection of a fixed insulating rod caused by a linear arrangement mode of a fixed contact of a strip-shaped tap switch in the prior art. The utility model also aims to provide a transformer applying the three-phase non-excited tap switch.
In order to achieve the above purpose, the three-phase non-excitation tap switch of the utility model adopts the following technical scheme:
the three-phase non-excited tapping switch comprises a fixed frame, three fixed insulating rods which are arranged at intervals in parallel are arranged on the fixed frame, fixed contact groups are arranged on the fixed insulating rods, each fixed contact group comprises a plurality of fixed contacts which are arranged at intervals along the extending direction of the corresponding fixed insulating rod, moving contact assemblies are assembled on the fixed insulating rods in a guiding and sliding manner, the moving contact assemblies are fixed on the same connecting piece, and push-pull handles which are used for driving the connecting piece to move so as to synchronously switch the moving contact assemblies to the fixed contacts of corresponding gears are further arranged on the connecting piece.
The beneficial effects are that: through setting up each static contact group on different fixed insulator spindle, avoided setting up alone on a fixed insulator spindle and lead to the longer condition of fixed insulator spindle, strengthened the structural strength of three-phase no excitation tapping switch to a certain extent, prolonged the life of three-phase no excitation tapping switch. In addition, through setting up each static contact group on different fixed insulator spindle, the distance between each static contact group has been increased to a certain extent, has improved the electrical protection performance of three-phase no-excitation tapping switch.
Further, the fixed contacts in the same gear in each fixed contact group are arranged in a collinear way.
Further, each stationary contact is arranged in a row along the extending direction of the corresponding fixed insulating rod and in a row along the direction perpendicular to the fixed insulating rod.
Further, the push-pull direction of the push-pull handle is parallel to the extending direction of the fixed insulating rod.
Further, a locking structure for locking the push-pull handle after the movable contact assembly is adjusted to the corresponding gear is further arranged on the push-pull handle.
Further, the locking structure comprises a plurality of locking holes which are arranged on the push-pull handle and correspond to the gears one by one, and locking pins which are inserted into the locking holes and used for blocking the setting surfaces mutually.
Further, an operation panel is further arranged on one side of the fixing frame, a through hole for the push-pull handle to penetrate out is formed in the operation panel, and the surface of the operation panel in the circumferential direction of the through hole forms the setting surface.
Further, the connecting piece is a connecting plate, and the connecting plate is perpendicular to each fixed insulating rod.
The transformer of the utility model adopts the following technical scheme:
the transformer comprises a transformer body and a three-phase non-excitation tapping switch arranged on the transformer body, the three-phase non-excitation tapping switch comprises a fixing frame, three fixed insulating rods which are arranged at intervals in parallel are arranged on the fixing frame, fixed contact groups are arranged on the fixed insulating rods, each fixed contact group comprises a plurality of fixed contacts which are arranged at intervals along the extending direction of the corresponding fixed insulating rod, moving contact assemblies are assembled on the fixed insulating rods in a guiding and sliding manner, the moving contact assemblies are fixed on the same connecting piece, and push-pull handles which are used for driving the connecting piece to move so as to synchronously switch the moving contact assemblies to the fixed contacts of corresponding gear positions are further arranged on the connecting piece.
The beneficial effects are that: through setting up each static contact group respectively on different fixed insulator spindle, avoided each static contact group to adopt the mode of line type to arrange the condition that leads to fixed insulator spindle intensity to reduce, prolonged the life of three-phase no excitation tap changer, reduced the operation and the maintenance cost of transformer, in addition, through setting up each static contact group on different fixed insulator spindle, distance between each fixed insulator spindle can be along the direction of height of transformer to adjust, distance between each static contact on the same fixed insulator spindle can be along the width direction of transformer to adjust, avoided each static contact to adopt the mode of line type arrangement can only be along same direction to adjust the condition that makes the regulation interval limited, and then avoided the condition that the distance is too near easy mutual interference between the adjacent static contact group, improved the electrical protection level of three-phase no excitation tap changer.
Further, the fixed contacts in the same gear in each fixed contact group are arranged in a collinear way. The arrangement of the static contacts is regular, and the corresponding arrangement space is saved.
Further, each stationary contact is arranged in a row along the extending direction of the corresponding fixed insulating rod and in a row along the direction perpendicular to the fixed insulating rod. The distribution of the fixed contacts is uniform, the stability of the structure is facilitated, and the synchronous switching of the fixed contacts with the same gear is also facilitated.
Further, the push-pull direction of the push-pull handle is parallel to the extending direction of the fixed insulating rod. The overlapping section is arranged between the push-pull handle and the fixed insulating rod, so that the arrangement space of the push-pull handle is saved.
Further, a locking structure for locking the push-pull handle after the movable contact assembly is adjusted to the corresponding gear is further arranged on the push-pull handle. The locking structure can fix the push-pull handle after gear switching, so that the situation that the gear switching is easily caused by misoperation and the like is avoided.
Further, the locking structure comprises a plurality of locking holes which are arranged on the push-pull handle and correspond to the gears one by one, and locking pins which are inserted into the locking holes and used for blocking the setting surfaces mutually. The locking hole and the locking pin are simple in structure, convenient to arrange and easy to operate.
Further, an operation panel is further arranged on one side of the fixing frame, a through hole for the push-pull handle to penetrate out is formed in the operation panel, and the surface of the operation panel in the circumferential direction of the through hole forms the setting surface. The operation panel can play a role in protecting the internal structure of the three-phase non-excitation tapping switch.
Further, the connecting piece is a connecting plate, and the connecting plate is perpendicular to each fixed insulating rod. The size of the connecting plate is shortest, and the miniaturization and the light weight of the three-phase non-excited tap switch are facilitated.
Further, a tap switch mounting box for mounting the three-phase non-excitation tap switch is further arranged on the transformer body. The setting of tapping switch mounting box can play the effect of protection three-phase no excitation tapping switch.
Drawings
Fig. 1 is a front view showing the overall structure of a three-phase off-circuit tap changer of embodiment 1 of the transformer of the present utility model;
fig. 2 is a right side view of the three-phase off-circuit tap changer of embodiment 1 of the transformer of the present utility model;
fig. 3 is a schematic overall structure of embodiment 1 of the transformer of the present utility model;
fig. 4 is a right side view of embodiment 1 of the transformer of the present utility model;
in the figure: the transformer comprises a 1-fixing frame, a 2-fixed contact, a 3-moving contact assembly, a 4-connecting plate, a 5-fixed insulating rod, a 6-operating panel, a 7-push-pull handle, an 8-locking pin, a 9-transformer body, a 10-wire slot, an 11-tapping switch mounting box and a 12-tap.
Detailed Description
Embodiments of the present utility model will be further described with reference to the accompanying drawings.
Specific embodiment 1 of the transformer of the present utility model:
as shown in fig. 1 to 4, the transformer includes a transformer body 9, and three winding assemblies are disposed in the transformer body 9, and each winding assembly includes an iron core located inside and a coil wound on the outer side of the iron core. Each winding component is correspondingly provided with a plurality of taps 12, and each tap 12 is connected with coils with different turns in each winding component, so that the adjustment of different voltages can be realized by switching different taps 12. In order to facilitate the adjustment of different voltages to rated voltages, the transformer body 9 is further provided with a three-phase non-excited tap changer (hereinafter referred to as tap changer), the tap changer comprises a fixed contact group and a moving contact assembly 3, in this embodiment, since the transformer comprises three winding assemblies, the tap changer is also provided with three fixed contact groups corresponding to the three winding assemblies one by one, each fixed contact group comprises a plurality of fixed contacts 2, wherein the fixed contacts 2 are respectively connected with taps 12 corresponding to the box, connecting lines between each fixed contact group and the corresponding tap 12 are assembled in a wire slot 10, and in this embodiment, three wire slots 10 are provided. In order to avoid the contact of non-engineering technicians with the tap changer, the transformer body 9 is also provided with a tap changer mounting box 11 with a protection function, and the tap changer is directly mounted in the tap changer mounting box 11 during mounting. When the rated voltage is regulated, the voltage can be regulated by switching the movable contact assembly 3 to the corresponding fixed contact 2.
The tapping switch in this embodiment specifically adopts the following structure, tapping switch includes mount 1, mount 1 is square frame form, three fixed insulator spindle 5 is installed to parallel interval on the mount 1, all be provided with a set of static contact group on each fixed insulator spindle 5, all include six static contacts 2 in each static contact group, each static contact 2 in each static contact group is equidistant along the extending direction of corresponding fixed insulator spindle 5, the static contact in each static contact group is listed as along the extending direction of corresponding fixed insulator spindle in this embodiment, arrange in rows along the direction of perpendicular to fixed insulator spindle, there are six rows of three columns of static contacts in this embodiment. The fixed insulating rods 5 are also provided with a moving contact assembly 3 in a guiding manner, and each moving contact assembly 3 can slide along the corresponding fixed insulating rod 5 in a guiding manner, so that synchronous driving of each moving contact assembly 3 is realized, in this embodiment, each moving contact assembly 3 is fixed on the same connecting piece, the connecting piece is a connecting plate 4 in this embodiment, a push-pull handle 7 is fixedly connected to the connecting plate 4, and the push-pull direction of the push-pull handle 7 in this embodiment is parallel to the extending direction of each fixed insulating rod 5. After the moving contact assembly 3 is switched to the corresponding fixed contact 2 under the driving action of the push-pull handle 7, in order to avoid the situation that the push-pull handle 7 slides easily due to misoperation and other reasons, a locking structure for fixing the push-pull handle 7 after the push-pull handle 7 is moved is further arranged on the push-pull handle 7, and the locking structure in the embodiment is a locking hole and a locking pin 8 inserted in the locking hole. The locking holes are arranged on the push-pull handle 7, and because the tapping switch in the embodiment has five shift positions, the five locking holes on the push-pull handle 7 are correspondingly provided with five locking holes, the five locking holes are arranged at intervals along the extending direction of the push-pull handle 7, the distance between the locking holes is determined according to the shift position switching distance of the moving contact assembly 3, and the shift position switching distance is the sliding distance of the moving contact assembly 3 in the process of switching to the corresponding fixed contact 2. When the locking pin 8 is penetrated in the corresponding locking hole, the locking pin 8 can be blocked with the corresponding setting surface, so that the aim of limiting the sliding movement of the push-pull handle 7 is fulfilled. In this embodiment, the fixing frame 1 is further provided with an operation panel 6, the operation panel 6 is provided with a through hole through which the push-pull handle 7 passes, and the outer surface of the operation panel on the periphery of the through hole in this embodiment forms a setting surface.
It should be noted that, in this embodiment, the moving contact assembly 3 is a conventional structure in the prior art, the moving contact assembly 3 includes two moving contacts that are located inside and are oppositely disposed, springs are disposed on the outer sides of the two moving contacts, when the moving contact assembly is switched to the corresponding fixed contact 2, the two moving contacts will clamp the fixed contact 2 between the two moving contacts, so that the switching between the moving contact assembly 3 and the corresponding fixed contact 2 is realized, and the springs will apply force to the corresponding moving contacts, so that good contact between the moving contacts and the fixed contact 2 is ensured. In addition, in this embodiment, the extending direction of the connecting plate 4 is perpendicular to the extending direction of each fixed insulating rod 5, so that the length of the connecting plate 4 is shortest, which is beneficial to the miniaturized design of the tapping switch.
When the transformer of the embodiment is used, the voltage with different sizes can be adjusted to be rated voltage through pushing and pulling the push-pull handle 7, the push-pull handle 7 can drive the moving contact assemblies 3 on the fixed insulating rods 5 to move and switch the moving contact assemblies 3 to different fixed contacts 2 in the push-pull process, after the switching is finished, the locking pin 8 penetrates into the locking hole on the push-pull handle 7, and the part of the locking pin 8 exposed out of the locking hole can be blocked with the operation panel 6, so that the sliding of the push-pull handle 7 towards the fixed contacts 2 is limited.
In other embodiments: the number of the fixed contacts on each fixed insulating rod can be adjusted according to actual conditions.
In other embodiments: the connecting plates can be obliquely arranged with the fixed insulating rods.
In other embodiments: the connecting piece can be in other shapes such as a curved bar, a V-shaped bar and the like, and correspondingly, when the connecting piece is the curved bar, all the fixed contacts in the same gear are also arranged by adopting curves matched with the shape of the curved bar; when the connecting piece is a V-shaped rod, all the fixed contacts in the same gear are also arranged in a V shape matched with the shape of the V-shaped rod.
Embodiments of the three-phase off-circuit tap-changer of the present utility model: the specific structure of the three-phase non-excited tap switch is the same as that of the three-phase non-excited tap switch in the transformer, and the description is omitted here.
Claims (10)
1. The three-phase non-excitation tapping switch is characterized in that: including the mount, be provided with three parallel interval arrangement's fixed insulator spindle on the mount, all be provided with the static contact group on each fixed insulator spindle, each fixed insulator spindle and the three looks one-to-one of static contact group on it and circuit each, each static contact group all includes a plurality of static contacts of arranging along the extending direction interval of corresponding fixed insulator spindle, still all direction sliding is equipped with the moving contact subassembly on each fixed insulator spindle, and each moving contact subassembly is all fixed on same connecting piece, still be provided with the push-pull handle on the static contact that is used for driving the connecting piece and removes in order to switch each moving contact subassembly to corresponding gear in step on the connecting piece.
2. The three-phase off-circuit tap-changer of claim 1, wherein: the fixed contacts in the same gear in each fixed contact group are arranged in a collinear way.
3. The three-phase off-circuit tap-changer of claim 2, wherein: the fixed contacts are arranged in rows along the extending direction of the corresponding fixed insulating rod and in rows along the direction perpendicular to the fixed insulating rod.
4. A three-phase off-circuit tap-changer according to claim 1 or 2 or 3, wherein: the push-pull direction of the push-pull handle is parallel to the extending direction of the fixed insulating rod.
5. The three-phase off-circuit tap-changer of claim 4, wherein: and the push-pull handle is also provided with a locking structure for locking the push-pull handle after the movable contact assembly is adjusted to the corresponding gear.
6. The three-phase off-circuit tap-changer of claim 5, wherein: the locking structure comprises a plurality of locking holes which are arranged on the push-pull handle and correspond to the gears one by one, and locking pins which are inserted into the locking holes and used for blocking the setting surfaces mutually.
7. The three-phase off-circuit tap-changer of claim 6, wherein: one side of the fixing frame is also provided with an operation panel, the operation panel is provided with a through hole for the push-pull handle to pass through, and the surface of the operation panel in the circumferential direction of the through hole forms the setting surface.
8. A three-phase off-circuit tap-changer according to claim 1 or 2 or 3, wherein: the connecting piece is a connecting plate, and the connecting plate is perpendicular to each fixed insulating rod.
9. The transformer comprises a transformer body and a three-phase non-excitation tapping switch arranged on the transformer body, and is characterized in that: the three-phase off-circuit tap-changer is configured by using the three-phase off-circuit tap-changer according to any one of the claims 1 to 8.
10. The transformer according to claim 9, wherein: and the transformer body is also provided with a tapping switch mounting box for mounting the three-phase non-excitation tapping switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810867000.XA CN108987146B (en) | 2018-08-01 | 2018-08-01 | Three-phase non-excitation tapping switch and transformer using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810867000.XA CN108987146B (en) | 2018-08-01 | 2018-08-01 | Three-phase non-excitation tapping switch and transformer using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108987146A CN108987146A (en) | 2018-12-11 |
| CN108987146B true CN108987146B (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810867000.XA Active CN108987146B (en) | 2018-08-01 | 2018-08-01 | Three-phase non-excitation tapping switch and transformer using same |
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| Country | Link |
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| CN (1) | CN108987146B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112133548B (en) * | 2020-09-17 | 2023-06-13 | 天津市特变电工变压器有限公司 | High-current dry type transformer with tapping voltage regulation function and voltage regulation method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2062483U (en) * | 1990-03-20 | 1990-09-19 | 沈阳市变压器开关厂 | Non-exciting shunting switch |
| CN200944345Y (en) * | 2006-08-07 | 2007-09-05 | 武汉泰普变压器开关有限公司 | Off-circuit positive and negative regulating strip-type tapping switch |
| CN201590318U (en) * | 2010-01-14 | 2010-09-22 | 浙江省三门腾龙电器有限公司 | Changeable non-excitation shunting switch |
| CN102148095A (en) * | 2010-02-10 | 2011-08-10 | 任宏宇 | Bar-shaped tapping switch for respective voltage regulation in conversion of two voltage classes by single control system |
| CN105977070A (en) * | 2016-06-28 | 2016-09-28 | 山东达驰电气有限公司 | Non-excitation tapping switch for grounding transformer |
| CN207529829U (en) * | 2017-10-13 | 2018-06-22 | 辽宁金立电力电器有限公司 | A kind of special strip-shape tap switch of triangular solid Wound iron-core transformer |
| CN208622619U (en) * | 2018-08-01 | 2019-03-19 | 河南森源电气股份有限公司 | The transformer of three-phase off circuit tap changer and the application tap switch |
-
2018
- 2018-08-01 CN CN201810867000.XA patent/CN108987146B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2062483U (en) * | 1990-03-20 | 1990-09-19 | 沈阳市变压器开关厂 | Non-exciting shunting switch |
| CN200944345Y (en) * | 2006-08-07 | 2007-09-05 | 武汉泰普变压器开关有限公司 | Off-circuit positive and negative regulating strip-type tapping switch |
| CN201590318U (en) * | 2010-01-14 | 2010-09-22 | 浙江省三门腾龙电器有限公司 | Changeable non-excitation shunting switch |
| CN102148095A (en) * | 2010-02-10 | 2011-08-10 | 任宏宇 | Bar-shaped tapping switch for respective voltage regulation in conversion of two voltage classes by single control system |
| CN105977070A (en) * | 2016-06-28 | 2016-09-28 | 山东达驰电气有限公司 | Non-excitation tapping switch for grounding transformer |
| CN207529829U (en) * | 2017-10-13 | 2018-06-22 | 辽宁金立电力电器有限公司 | A kind of special strip-shape tap switch of triangular solid Wound iron-core transformer |
| CN208622619U (en) * | 2018-08-01 | 2019-03-19 | 河南森源电气股份有限公司 | The transformer of three-phase off circuit tap changer and the application tap switch |
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| Publication number | Publication date |
|---|---|
| CN108987146A (en) | 2018-12-11 |
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