CN111900000A - Separating tap changer - Google Patents
Separating tap changer Download PDFInfo
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- CN111900000A CN111900000A CN202010843133.0A CN202010843133A CN111900000A CN 111900000 A CN111900000 A CN 111900000A CN 202010843133 A CN202010843133 A CN 202010843133A CN 111900000 A CN111900000 A CN 111900000A
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- Prior art keywords
- tank
- selector
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- gear box
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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
- H01H9/0044—Casings; Mountings; Disposition in transformer housing
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- 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
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- 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
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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
- H01H9/0027—Operating mechanisms
Abstract
The invention discloses a separated tap changer, comprising: the split tap changer comprises an auxiliary tank isolated from the transformer oil tank, wherein the auxiliary tank is filled with insulating media, and the diverter switch is placed in the auxiliary tank and surrounded by the insulating media. The tap changer with the separated structure can separate the diverter switch which generates electric sparks or electric arcs from the transformer oil tank and independently place the diverter switch in the auxiliary tank, can limit the influence range in the auxiliary tank even if a fault occurs, cannot damage the transformer oil tank and the transformer body, and greatly reduces the operation risk of the transformer.
Description
Technical Field
The invention relates to the field of power equipment, in particular to a tap changer for an oil-immersed transformer.
Background
Tap changers are an important component in transformers. The tap changer can change the turn ratio of the primary winding and the secondary winding of the transformer by changing the winding tap of the connecting transformer under the condition that the transformer is loaded or unloaded (namely, power failure or power failure), thereby achieving the purpose of changing the output voltage of the transformer. Tap changers are very important electrical devices.
A commonly used transformer is an oil-immersed transformer, i.e. the whole transformer is immersed in transformer oil. The transformer oil provides insulation and cooling. Fig. 1 discloses a schematic construction of a tap changer used in the prior art. Referring to fig. 1, the tap changer comprises: transformer tank 13, tap selector 12, diverter switch 11 and electric machine 14. The transformer oil tank 13 is filled with transformer oil 132 and the transformer 131 is immersed in the transformer oil 132. As shown in fig. 1, in the prior art, the diverter switch 11 and the tap selector 12 are also placed in the transformer tank 13 and submerged in transformer oil 132. The diverter switch 11 and the tap selector 12 are of a directly connected, monolithic construction. The diverter switch 11 is on the top and the tap selector 12 is on the bottom, and the diverter switch 11 and the tap selector 12 realize synchronous action through mechanical connection. The integral change-over switch 11 and the tap selector 12 are integrally arranged in the transformer oil tank 13 through a flange hole on the upper cover of the transformer oil tank 13. The diverter switch 11 is typically a cylindrical member configured to form a separate cylindrical oil chamber in which the diverter switch 11 is located. The tap selector 12 is typically a cage-like structure having a plurality of terminals connected to corresponding transformer coil taps via electrical cables. The diverter switch 11, the tap selector 12 and the connecting cables are immersed in the transformer oil of the transformer tank.
The switching operation of the diverter switch 11 and the tap selector 12 is driven by an electric mechanism 14. The electric mechanism 14 is placed in a protective case, and the electric mechanism 14 is mounted on the outer wall of the transformer tank 13 together with the protective case. The output shaft of the electric machine 14 is connected to a gear box 16 through a transmission shaft 15. The gear box 16 is a single-output-shaft gear box, the gear box 16 is mounted on the upper cover of the transformer oil tank 13, and the gear box 16 is connected to the selector switch 11 and the tap selector 12. The function of the transmission shaft 15 is to realize reversing transmission so as to adapt to different directions of the output shaft of the electric mechanism 14 and the output shaft of the gear box 16. The electric mechanism 14 transmits the rotation torque to the switch 11 and the tap selector 12 through the transmission shaft 15 and the gear box 16, and the switching and the tap operation are completed.
When the load switching is performed, a spark is generated at the changeover switch 11 for changing over the contact. The high temperature of the spark may cause changes in the surrounding transformer oil, which may degrade the insulating properties of the transformer oil. After a long period of use, a fault current may occur during load switching due to a drop in the performance of the transformer oil or due to aging of other devices. The fault current is typically high current, which may cause arcing at the diverter switch 11. The arc is at a high temperature and lasts for a long time, and the sustained high temperature arc causes the surrounding transformer oil to burn. The small-range combustion may cause damage to peripheral devices such as the diverter switch 11 and the tap selector 12, and the combusted transformer oil forms contaminating impurities, which seriously affect the performance of the overall insulating medium in the transformer tank. The large-scale combustion can induce a large amount of transformer oil in the transformer oil tank to be combusted, so that the whole transformer oil tank is combusted and even explodes, and serious accidents are caused.
Disclosure of Invention
The invention provides a tap changer with a separated structure, which separates a change-over switch generating electric sparks or electric arcs from a transformer oil tank so as to avoid accidents.
According to an embodiment of the present invention, there is provided a disconnect tap changer including: the split tap changer comprises an auxiliary tank isolated from the transformer oil tank, wherein the auxiliary tank is filled with insulating media, and the diverter switch is placed in the auxiliary tank and surrounded by the insulating media.
In one embodiment, the tap selector is placed in a transformer tank and submerged in transformer oil. Only the change-over switch is placed in the auxiliary box. The diverter switch and the tap selector are connected by conductive lines passing through the auxiliary tank and the tank wall of the transformer tank. The electric mechanism is arranged on the auxiliary box and is connected to the selector switch and the tap selector through the transmission assembly and drives the selector switch and the tap selector to act synchronously.
In one embodiment, the auxiliary tank is mounted on but isolated from the transformer tank, the wall of the auxiliary tank is closely attached to the wall of the transformer tank, the conductive circuit comprises a set of sleeves and two sets of cables, one set of sleeves simultaneously penetrates through the wall of the auxiliary tank and the wall of the transformer tank which are closely attached to each other, one set of cables is connected with the selector switch and the sleeves, and the other set of cables is connected with the tapping selector and the sleeves. The transmission assembly is a homodromous rotating assembly and comprises a transmission shaft, a double-output-shaft gear box and a single-output-shaft gear box, an output shaft of the electric mechanism is connected to one of shafts of the double-output-shaft gear box through the transmission shaft, the other shaft of the double-output-shaft gear box is connected to the single-output-shaft gear box, the double-output-shaft gear box drives the selector, and the single-output-shaft gear box drives the tapping selector.
In one embodiment, the auxiliary tank is separate from the transformer tank, the conductive circuit includes two sets of bushings extending through a wall of the auxiliary tank, a first set of electrical cables connecting the switch to the first set of bushings, a second set of bushings extending through a wall of the transformer tank, a second set of electrical cables connecting the first set of bushings to the second set of bushings, and a third set of electrical cables connecting the tap selector to the second set of bushings. The transmission assembly is a reversing rotating assembly and comprises a transmission shaft, a double-output-shaft gear box, a bevel gear set and a single-output-shaft gear box, an output shaft of the electric mechanism is connected to one shaft of the double-output-shaft gear box through the transmission shaft, the other shaft of the double-output-shaft gear box is connected to one end of the bevel gear set, the other end of the bevel gear set is connected to the single-output-shaft gear box, the double-output-shaft gear box drives a selector, and the single-output-shaft gear box drives a tapping selector.
In one embodiment, the insulating medium in the auxiliary tank is transformer oil or insulating gas.
In one embodiment, the diverter switch and the tap selector are both placed in an auxiliary tank and surrounded by an insulating medium, the diverter switch and the tap selector being directly connected and acting in synchronism. The tap selector and the transformer are connected by conductive lines passing through the auxiliary tank and the tank wall of the transformer tank. The electric mechanism is arranged on the auxiliary box and is connected to the selector switch through the transmission assembly to drive the selector switch and the tapping selector to synchronously act.
In one embodiment, the auxiliary tank is mounted on but isolated from the transformer tank, the wall of the auxiliary tank is closely attached to the wall of the transformer tank, the conductive circuit comprises a set of sleeves and two sets of cables, one set of sleeves simultaneously penetrates through the wall of the auxiliary tank and the wall of the transformer tank which are closely attached to each other, one set of cables is connected with the tapping selector and the sleeves, and the other set of cables is connected with the transformer and the sleeves. The transmission assembly transmission shaft and the single output shaft gear box, the output shaft of the electric mechanism is connected to the single output shaft gear box through the transmission shaft, and the single output shaft gear box drives the selector switch and the tapping selector.
In one embodiment, the auxiliary tank is separate from the transformer tank, the conductive circuit includes two sets of bushings extending through a wall of the auxiliary tank, a first set of electrical cables connecting the tap selector to the first set of bushings, a second set of electrical cables extending through a wall of the transformer tank, a second set of electrical cables connecting the first set of bushings to the second set of bushings, and a third set of electrical cables connecting the transformer to the second set of bushings. The transmission assembly transmission shaft and the single output shaft gear box, the output shaft of the electric mechanism is connected to the single output shaft gear box through the transmission shaft, and the single output shaft gear box drives the selector switch and the tapping selector.
In one embodiment, the insulating medium in the auxiliary tank is transformer oil or insulating gas.
The tap changer with the separated structure can separate the diverter switch which generates electric sparks or electric arcs from the transformer oil tank and independently place the diverter switch in the auxiliary tank, can limit the influence range in the auxiliary tank even if a fault occurs, cannot damage the transformer oil tank and the transformer body, and greatly reduces the operation risk of the transformer.
Drawings
Fig. 1 discloses a schematic construction of a tap changer used in the prior art.
Fig. 2 discloses a schematic construction of a tap changer of the divided type according to a first embodiment of the invention.
Fig. 3 discloses a block diagram of a tap changer according to a second embodiment of the invention.
Fig. 4 discloses a block diagram of a tap changer according to a third embodiment of the invention.
Fig. 5 discloses a block diagram of a tap changer according to a fourth embodiment of the invention.
Detailed Description
Among the individual components that make up the tap changer, the component that generates the spark or arc is the diverter switch, and therefore the risk of failure is mainly concentrated on the diverter switch. The probability of major accidents can be greatly reduced by separating the change-over switch from the oil tank of the transformer. The invention provides a separating tap changer, the basic components of which are the same as those of the tap changer in the prior art, comprising: the transformer oil tank is filled with transformer oil, the transformer is immersed in the transformer oil, and the electric mechanism drives the selector switch and the tapping selector to act to switch current. The tap changer removes a diverter switch from a transformer tank and places the diverter switch in a separate space, and specifically, the tap changer comprises an auxiliary tank isolated from the transformer tank, the auxiliary tank is filled with an insulating medium, and the diverter switch is placed in the auxiliary tank and surrounded by the insulating medium.
Fig. 2 discloses a schematic construction of a tap changer of the divided type according to a first embodiment of the invention. Referring to fig. 2, in a first embodiment, the divided tap changer comprises: transformer tank 13, tap selector 12, diverter switch 11 and electric machine 14. The transformer oil tank 13 is filled with transformer oil 132 and the transformer 131 is immersed in the transformer oil 132. The electric mechanism 14 drives the selector switch 11 and the tap selector 12 to operate, thereby switching the current. The respective structures and functions of the transformer tank 13, the tap selector 12, the diverter switch 11 and the electric mechanism 14 are the same as those of the prior art and will not be described here. In the first embodiment, the sub tank 20 is installed on the outer wall of the transformer tank 13 but is isolated from the transformer tank 13. The wall of the auxiliary tank 20 is closely attached to the wall of the transformer tank 13, and although the auxiliary tank 20 is mounted on the transformer tank 13, the auxiliary tank 20 forms an isolated independent space, and the space inside the auxiliary tank is not communicated with the space inside the transformer tank. The auxiliary tank 20 is filled with an insulating medium 30, and the insulating medium 30 in the auxiliary tank 20 may be the same transformer oil as that in the transformer oil tank 13, or may be an insulating gas such as an inert gas or other inactive gas. In the first embodiment, only the diverter switch 11 is placed in the sub tank 20, and the diverter switch 11 is surrounded by the insulating medium 30. The tap selector 12 continues to be placed in the transformer tank 13 and submerged in the transformer oil 132. The tap selector 12 does not generate electrical sparks or arcs and therefore the risk of placing the tap selector 12 in a transformer tank is not high. Since the diverter switch 11 and the tap selector 12 are separated, it is necessary to establish an electrically conductive line and a mechanical linkage between the diverter switch 11 and the tap selector 12. In the first embodiment, the diverter switch 11 and the tap selector 12 are connected by conductive lines through the wall of the sub tank and the transformer tank. Since the sub tank 20 is mounted on the transformer tank 13 and the wall of the sub tank 20 is closely attached to the wall of the transformer tank 13, the conductive path in the first embodiment includes a set of the bushing 22 and two sets of the cable lines 211 and 212. One set of cables 22 passes through the wall of the attached sub-tank and the wall of the transformer tank, one set of cables 211 connects the switch 11 and the cables 22, and the other set of cables 212 connects the tap selector 12 and the cables 22. The diverter switch 11 and the tap selector 12 establish an electrical connection via the conductive line. The electric machine 14 is mounted on the accessory box 20, and the electric machine 14 is connected to the diverter switch 11 and the tap selector 12 through a transmission assembly and drives the diverter switch 11 and the tap selector 12 to act synchronously. In the first embodiment, the transmission assembly is a co-rotating assembly including the transmission shaft 15, the double-output-shaft gear box 23, and the single-output-shaft gear box 24. The output shaft of the electric mechanism 14 is connected to one of the shafts of the double output shaft gear box 23 through the transmission shaft 15, and the other shaft of the double output shaft gear box 23 is connected to the single output shaft gear box 24. The double output shaft gear box 23 drives the change-over switch 11, and the single output shaft gear box 24 drives the tap selector 12. The interconnected double-output-shaft gear box 23 and single-output-shaft gear box 24 act synchronously, so that the electric mechanism 14 can drive the diverter switch 11 and the tap selector 12 to act synchronously. Though the conductive circuit and the transmission component are separately arranged, the switch 11 and the tap selector 12 can still realize circuit conduction and synchronous action, and the function is equivalent to that of the switch and the tap selector in the prior art. The first embodiment separates only the changeover switch 11, so that the volume of the sub-tank 20 can be set comparatively small. When maintenance or replacement is needed, only the auxiliary box 20 and the change-over switch 11 need to be maintained or replaced, and the cost is low. The auxiliary box 20 is directly arranged on the outer wall of the transformer oil tank 13, the structures of the conducting circuit and the transmission component are compact, and the occupied area of the whole split tap changer is small.
Fig. 3 discloses a block diagram of a tap changer according to a second embodiment of the invention. Referring to fig. 3, in a second embodiment, the divided tap changer comprises: transformer tank 13, tap selector 12, diverter switch 11 and electric machine 14. The transformer oil tank 13 is filled with transformer oil 132 and the transformer 131 is immersed in the transformer oil 132. The electric mechanism 14 drives the selector switch 11 and the tap selector 12 to operate, thereby switching the current. The respective structures and functions of the transformer tank 13, the tap selector 12, the diverter switch 11 and the electric mechanism 14 are the same as those of the prior art and will not be described here. In the second embodiment, the sub tank 20 is separated from the transformer tank 13, and a sufficient separation distance is left between the sub tank 20 and the transformer tank 13. The auxiliary tank 20 is completely separated from the transformer tank 13. The auxiliary tank 20 is filled with an insulating medium 30, and the insulating medium 30 in the auxiliary tank 20 may be the same transformer oil as that in the transformer oil tank 13, or may be an insulating gas such as an inert gas or other inactive gas. In the second embodiment, only the diverter switch 11 is also placed in the sub-tank 20, the diverter switch 11 being surrounded by the insulating medium 30. The tap selector 12 continues to be placed in the transformer tank 13 and submerged in the transformer oil 132. The tap selector 12 does not generate electrical sparks or arcs and therefore the risk of placing the tap selector 12 in a transformer tank is not high. Since the diverter switch 11 and the tap selector 12 are separated, it is necessary to establish an electrically conductive line and a mechanical linkage between the diverter switch 11 and the tap selector 12. In the second embodiment, the diverter switch 11 and the tap selector 12 are connected by conductive lines through the wall of the sub tank and the transformer tank. Since the sub tank 20 and the transformer tank 13 are spaced apart, the conductive path in the second embodiment includes two sets of bushings and three sets of cable lines. The first set of bushings 221 pass through the wall of the accessory box 20 and the first set of cable wires 211 connect the switch 11 with the first set of bushings 221. A second set of bushings 222 passes through the wall of the transformer tank 13, a second set of electrical cables 212 connects the first set of bushings 221 with the second set of bushings 222, and a third set of electrical cables 213 connects the tap selector 12 with the second set of bushings 222. The diverter switch 11 and the tap selector 12 establish an electrical connection via the conductive line. The electric machine 14 is mounted on the accessory box 20, and the electric machine 14 is connected to the diverter switch 11 and the tap selector 12 through a transmission assembly and drives the diverter switch 11 and the tap selector 12 to act synchronously. In the second embodiment, the drive assembly is a reversing rotary assembly comprising a drive shaft 15, a double-output gear box 23, a bevel gear set 25 and a single-output gear box 24. The separately provided sub-tank 20 and the transformer tank 13 have different heights, so that it is necessary to change the direction of the driving at the time of driving. Referring to fig. 3, in the second embodiment, the output shaft of the electric mechanism 14 is connected to one of the shafts of the double output shaft gear box 23 through the transmission shaft 15, the other shaft of the double output shaft gear box 23 is connected to one end of the bevel gear set 25, and the other end of the bevel gear set 25 is connected to the single output shaft gear box 24. The bevel gear box 25 changes the transmission direction so that the double-output-shaft gear box 23 and the single-output-shaft gear box 24 can be set at different heights. The double output shaft gear box 23 drives the change-over switch 11, and the single output shaft gear box 24 drives the tap selector 12. The double output shaft gear box 23 and the single output shaft gear box 24 connected by the bevel gear set 25 act synchronously, so that the electric mechanism 14 can drive the selector switch 11 and the tap selector 12 to act synchronously. Though the conductive circuit and the transmission component are separately arranged, the switch 11 and the tap selector 12 can still realize circuit conduction and synchronous action, and the function is equivalent to that of the switch and the tap selector in the prior art. Similarly to the first embodiment, the second embodiment also separates only the changeover switch 11, so that the volume of the sub-tank 20 can be set comparatively small. When maintenance or replacement is needed, only the auxiliary box 20 and the change-over switch 11 need to be maintained or replaced, and the cost is low. The auxiliary tank 20 is separated from the transformer tank 13 and maintains a sufficient distance, so that the safety of the transformer tank is higher, and even if the auxiliary tank 20 has a serious fault to cause combustion or explosion, the safety of the transformer tank is not affected. But the structure of conducting circuit and transmission component is more complicated, the distance is longer, the cost is slightly higher because of the separate arrangement, and the occupied area of the whole separated tap changer is enlarged.
Fig. 4 discloses a block diagram of a tap changer according to a third embodiment of the invention. Referring to fig. 4, in a third embodiment, the splitter tap changer comprises: transformer tank 13, tap selector 12, diverter switch 11 and electric machine 14. The transformer oil tank 13 is filled with transformer oil 132 and the transformer 131 is immersed in the transformer oil 132. The electric mechanism 14 drives the selector switch 11 and the tap selector 12 to operate, thereby switching the current. The respective structures and functions of the transformer tank 13, the tap selector 12, the diverter switch 11 and the electric mechanism 14 are the same as those of the prior art and will not be described here. In the third embodiment, the sub tank 20 is installed on the outer wall of the transformer tank 13 but is isolated from the transformer tank 13. The wall of the auxiliary tank 20 is closely attached to the wall of the transformer tank 13, and although the auxiliary tank 20 is mounted on the transformer tank 13, the auxiliary tank 20 forms an isolated independent space, and the space inside the auxiliary tank is not communicated with the space inside the transformer tank. The auxiliary tank 20 is filled with an insulating medium 30, and the insulating medium 30 in the auxiliary tank 20 may be the same transformer oil as that in the transformer oil tank 13, or may be an insulating gas such as an inert gas or other inactive gas. In the third embodiment, the diverter switch 11 and the tap selector 12 are both placed in the accessory box 20 and surrounded by an insulating medium 30. The diverter switch 11 and the tap selector 12 are of a directly connected, monolithic construction. The diverter switch 11 and the tap selector 12 in the third embodiment are directly connected and synchronously operated, and the structure and the connection mode are the same as those in the prior art, and it can be understood that the diverter switch 11 and the tap selector 12 in the third embodiment are integrally moved from the transformer tank 13 to the auxiliary tank 20. The direct connection of the diverter switch and the tap selector thus no longer requires consideration of the problems of electrical and mechanical connection between the diverter switch and the tap selector, only the electrical connection between the tap selector 12 and the transformer 13. In a third embodiment, the tap selector and the transformer are connected by conductive traces through the wall of the auxiliary tank and the transformer tank. In the illustrated embodiment, the conductive path connecting the tap selector and the transformer includes a set of bushings simultaneously passing through the walls of the attached sub-tank and the transformer tank, and two sets of cables connecting the tap selector and the bushings, one set of cables connecting the tap selector and the transformer and the bushings, and the other set of cables connecting the transformer and the bushings. The conductive lines are similar in structure to the conductive lines of the first embodiment and are therefore not drawn in detail in fig. 4, which conductive lines are exemplarily identified as 40 in fig. 4. The electric mechanism 14 is mounted on the accessory box 20, and the electric mechanism 14 is connected to the switch 11 through a transmission assembly to drive the switch 11 and the tap selector 12 to act synchronously. Since the structure and connection of the diverter switch 11 and the tap selector 12 in the third embodiment are the same as those in the prior art, a transmission assembly similar to that in the prior art can also be used. The transmission assembly comprises a transmission shaft 15 and a single-output-shaft gear box 16, and the output shaft of the electric mechanism 14 is connected to the single-output-shaft gear box 16 through the transmission shaft 15. A single-output-shaft gear box 16 drives the diverter switch 11 and the tap selector 12. Similar to the prior art, the single-output-shaft gear box 16 drives the directly connected diverter switch 11 and the tap selector 12 to act synchronously. The third embodiment separates the diverter switch 11 and the tap selector 12 integrally, so that the volume of the sub-tank 20 is relatively large. It is costly when maintenance or replacement is required. However, the change-over switch 11 and the tap selector 12 adopt the same direct connection mode as that in the prior art, extra electric conduction and transmission are not needed between the change-over switch 11 and the tap selector 12, the existing transmission assembly can be continuously used, only the electric conduction circuit between the tap selector and the transformer tap needs to be modified, and the modification cost is low.
Fig. 5 discloses a block diagram of a tap changer according to a fourth embodiment of the invention. Referring to fig. 5, in a fourth embodiment, the divided tap changer comprises: transformer tank 13, tap selector 12, diverter switch 11 and electric machine 14. The transformer oil tank 13 is filled with transformer oil 132 and the transformer 131 is immersed in the transformer oil 132. The electric mechanism 14 drives the selector switch 11 and the tap selector 12 to operate, thereby switching the current. The respective structures and functions of the transformer tank 13, the tap selector 12, the diverter switch 11 and the electric mechanism 14 are the same as those of the prior art and will not be described here. In the fourth embodiment, the sub tank 20 is separated from the transformer tank 13 with a sufficient space between the sub tank 20 and the transformer tank 13. The auxiliary tank 20 is completely separated from the transformer tank 13. The auxiliary tank 20 is filled with an insulating medium 30, and the insulating medium 30 in the auxiliary tank 20 may be the same transformer oil as that in the transformer oil tank 13, or may be an insulating gas such as an inert gas or other inactive gas. In the fourth embodiment, the diverter switch 11 and the tap selector 12 are both placed in the accessory box 20 and surrounded by an insulating medium 30. The diverter switch 11 and the tap selector 12 are of a directly connected, monolithic construction. The diverter switch 11 and the tap selector 12 in the fourth embodiment are directly connected and synchronously operated, and the structure and the connection mode are the same as those in the prior art, and it can be understood that the diverter switch 11 and the tap selector 12 in the fourth embodiment are integrally moved from the transformer tank 13 to the auxiliary tank 20. The direct connection of the diverter switch and the tap selector thus no longer requires consideration of the problems of electrical and mechanical connection between the diverter switch and the tap selector, only the electrical connection between the tap selector 12 and the transformer 13. In a fourth embodiment, the tap selector and the transformer are connected by conductive traces through the wall of the auxiliary tank and the transformer tank. In the illustrated embodiment, the conductive path connecting the tap selector and the transformer includes two sets of bushings extending through the wall of the accessory tank, a first set of electrical cables connecting the tap selector to the first set of bushings, a second set of electrical cables extending through the wall of the transformer tank, a second set of electrical cables connecting the first set of bushings to the second set of bushings, and a third set of electrical cables connecting the transformer to the second set of bushings. The conductive lines are similar in structure to the conductive lines in the second embodiment and are therefore not drawn in detail in fig. 5, which conductive lines are exemplarily identified as 41 in fig. 5. The electric mechanism 14 is mounted on the accessory box 20, and the electric mechanism 14 is connected to the switch 11 through a transmission assembly to drive the switch 11 and the tap selector 12 to act synchronously. Since the configuration and connection of the diverter switch 11 and the tap selector 12 in the fourth embodiment are the same as those in the prior art, a transmission assembly similar to that in the prior art can also be used. The transmission assembly comprises a transmission shaft 15 and a single-output-shaft gear box 16, and the output shaft of the electric mechanism 14 is connected to the single-output-shaft gear box 16 through the transmission shaft 15. A single-output-shaft gear box 16 drives the diverter switch 11 and the tap selector 12. Similar to the prior art, the single-output-shaft gear box 16 drives the directly connected diverter switch 11 and the tap selector 12 to act synchronously. The fourth embodiment separates the diverter switch 11 and the tap selector 12 as a whole, so that the volume of the sub-tank 20 is relatively large. It is costly when maintenance or replacement is required. However, the change-over switch 11 and the tap selector 12 adopt the same direct connection mode as that in the prior art, extra electric conduction and transmission are not needed between the change-over switch 11 and the tap selector 12, the existing transmission assembly can be continuously used, only the electric conduction circuit between the tap selector and the transformer tap needs to be modified, and the modification cost is low. The auxiliary tank 20 is separated from the transformer tank 13 and maintains a sufficient distance, so that the safety of the transformer tank is higher, and even if the auxiliary tank 20 has a serious fault to cause combustion or explosion, the safety of the transformer tank is not affected.
The tap changer with the separated structure can separate the diverter switch which generates electric sparks or electric arcs from the transformer oil tank and independently place the diverter switch in the auxiliary tank, can limit the influence range in the auxiliary tank even if a fault occurs, cannot damage the transformer oil tank and the transformer body, and greatly reduces the operation risk of the transformer.
It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention. The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.
Claims (9)
1. A split tap changer comprising: the split tap changer is characterized by comprising an auxiliary tank isolated from the transformer oil tank, wherein the auxiliary tank is filled with insulating media, and the diverter switch is placed in the auxiliary tank and surrounded by the insulating media.
2. Split tap changer according to claim 1,
the tapping selector is placed in a transformer oil tank and immersed in the transformer oil;
only a change-over switch is placed in the auxiliary box;
the selector switch is connected with the tapping selector through a conductive circuit passing through the auxiliary tank and the tank wall of the transformer oil tank;
the electric mechanism is arranged on the auxiliary box and is connected to the selector switch and the tap selector through the transmission assembly and drives the selector switch and the tap selector to act synchronously.
3. Split tap changer according to claim 2,
the auxiliary tank is arranged on the transformer oil tank but is isolated from the transformer oil tank, the tank wall of the auxiliary tank is clung to the tank wall of the transformer oil tank, the conductive circuit comprises a group of sleeves and two groups of cables, one group of sleeves simultaneously penetrate through the tank walls of the auxiliary tank and the tank wall of the transformer oil tank which are clung to each other, one group of cables is connected with the selector and the sleeves, and the other group of cables is connected with the tapping selector and the sleeves;
the transmission assembly is a homodromous rotating assembly and comprises a transmission shaft, a double-output-shaft gear box and a single-output-shaft gear box, an output shaft of the electric mechanism is connected to one of shafts of the double-output-shaft gear box through the transmission shaft, the other shaft of the double-output-shaft gear box is connected to the single-output-shaft gear box, the double-output-shaft gear box drives the selector, and the single-output-shaft gear box drives the tapping selector.
4. Split tap changer according to claim 2,
the auxiliary tank is separated from the transformer oil tank, the conductive circuit comprises two groups of sleeves and three groups of cables, the first group of sleeves passes through the tank wall of the auxiliary tank, the first group of cables is connected with the selector switch and the first group of sleeves, the second group of sleeves passes through the tank wall of the transformer oil tank, the second group of cables is connected with the first group of sleeves and the second group of sleeves, and the third group of cables is connected with the tapping selector and the second group of sleeves;
the transmission assembly is a reversing rotating assembly and comprises a transmission shaft, a double-output-shaft gear box, a bevel gear set and a single-output-shaft gear box, an output shaft of the electric mechanism is connected to one shaft of the double-output-shaft gear box through the transmission shaft, the other shaft of the double-output-shaft gear box is connected to one end of the bevel gear set, the other end of the bevel gear set is connected to the single-output-shaft gear box, the double-output-shaft gear box drives a selector, and the single-output-shaft gear box drives a tapping selector.
5. The disconnect tap changer of claim 2, wherein the insulating medium in the auxiliary tank is transformer oil or insulating gas.
6. Split tap changer according to claim 1,
the diverter switch and the tapping selector are both arranged in the auxiliary box and surrounded by insulating media, and the diverter switch and the tapping selector are directly connected and synchronously act;
the tapping selector is connected with the transformer through a conductive circuit penetrating through the auxiliary tank and the tank wall of the transformer oil tank;
the electric mechanism is arranged on the auxiliary box and is connected to the selector switch through the transmission assembly to drive the selector switch and the tapping selector to synchronously act.
7. Split tap changer according to claim 6,
the auxiliary tank is arranged on the transformer oil tank but is isolated from the transformer oil tank, the tank wall of the auxiliary tank is clung to the tank wall of the transformer oil tank, the conductive circuit comprises a group of sleeves and two groups of cables, one group of sleeves simultaneously penetrate through the tank walls of the auxiliary tank and the tank wall of the transformer oil tank which are clung to each other, one group of cables is connected with the tapping selector and the sleeves, and the other group of cables is connected with the transformer and the sleeves;
the transmission assembly comprises a transmission shaft and a single-output-shaft gear box, an output shaft of the electric mechanism is connected to the single-output-shaft gear box through the transmission shaft, and the single-output-shaft gear box drives the selector switch and the tapping selector.
8. Split tap changer according to claim 6,
the auxiliary tank is separated from the transformer oil tank, the conductive circuit comprises two groups of sleeves and three groups of cables, the first group of sleeves penetrates through the tank wall of the auxiliary tank, the first group of cables is connected with the tapping selector and the first group of sleeves, the second group of sleeves penetrates through the tank wall of the transformer oil tank, the second group of cables is connected with the first group of sleeves and the second group of sleeves, and the third group of cables is connected with the transformer and the second group of sleeves;
the transmission assembly comprises a transmission shaft and a single-output-shaft gear box, an output shaft of the electric mechanism is connected to the single-output-shaft gear box through the transmission shaft, and the single-output-shaft gear box drives the selector switch and the tapping selector.
9. The disconnect tap changer of claim 6, wherein the insulating medium in the auxiliary tank is transformer oil or insulating gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010843133.0A CN111900000A (en) | 2020-08-20 | 2020-08-20 | Separating tap changer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010843133.0A CN111900000A (en) | 2020-08-20 | 2020-08-20 | Separating tap changer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111900000A true CN111900000A (en) | 2020-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010843133.0A Pending CN111900000A (en) | 2020-08-20 | 2020-08-20 | Separating tap changer |
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| Country | Link |
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| CN (1) | CN111900000A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113593864A (en) * | 2021-06-24 | 2021-11-02 | 南京南瑞继保电气有限公司 | Split type on-load tap-changer and control method thereof |
| CN115774194A (en) * | 2022-11-30 | 2023-03-10 | 西安西电变压器有限责任公司 | Split type on-load tap-changer test device |
| CN116457912A (en) * | 2020-11-13 | 2023-07-18 | 日立能源瑞士股份公司 | On-load tap changer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105976991A (en) * | 2016-06-23 | 2016-09-28 | 山东达驰电气有限公司 | On-load voltage regulating transformer tank structure |
| CN109103007A (en) * | 2018-08-21 | 2018-12-28 | 上海华明电力设备制造有限公司 | A kind of oil immersed type gas-insulated tap switch |
| CN111540626A (en) * | 2020-04-22 | 2020-08-14 | 国家电网有限公司 | Mechanical type change-over switch arrangement structure of on-load tap-changer for converter transformer |
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- 2020-08-20 CN CN202010843133.0A patent/CN111900000A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105976991A (en) * | 2016-06-23 | 2016-09-28 | 山东达驰电气有限公司 | On-load voltage regulating transformer tank structure |
| CN109103007A (en) * | 2018-08-21 | 2018-12-28 | 上海华明电力设备制造有限公司 | A kind of oil immersed type gas-insulated tap switch |
| CN111540626A (en) * | 2020-04-22 | 2020-08-14 | 国家电网有限公司 | Mechanical type change-over switch arrangement structure of on-load tap-changer for converter transformer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116457912A (en) * | 2020-11-13 | 2023-07-18 | 日立能源瑞士股份公司 | On-load tap changer |
| CN113593864A (en) * | 2021-06-24 | 2021-11-02 | 南京南瑞继保电气有限公司 | Split type on-load tap-changer and control method thereof |
| CN115774194A (en) * | 2022-11-30 | 2023-03-10 | 西安西电变压器有限责任公司 | Split type on-load tap-changer test device |
| CN115774194B (en) * | 2022-11-30 | 2024-04-19 | 西安西电变压器有限责任公司 | Split type on-load tap-changer test device |
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