CN117809994A - Tap selector with arc-inducing contacts - Google Patents
Tap selector with arc-inducing contacts Download PDFInfo
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- CN117809994A CN117809994A CN202311237147.8A CN202311237147A CN117809994A CN 117809994 A CN117809994 A CN 117809994A CN 202311237147 A CN202311237147 A CN 202311237147A CN 117809994 A CN117809994 A CN 117809994A
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- contacts
- auxiliary
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- 230000001939 inductive effect Effects 0.000 title claims abstract description 13
- 239000004020 conductor Substances 0.000 claims description 40
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The present disclosure relates to a tap selector with arc inducing contacts, and more particularly, to a tap selector with arc inducing contacts in which an auxiliary contact makes contact with a movable contact to induce an arc and a main contact makes secondary contact with a movable contact to achieve electrical conduction when switching a load tap of an OLTC installed in an oil-immersed distribution transformer. According to the present disclosure, the auxiliary contacts provided in the form of rollers need to be first brought into contact with the main contacts and positioned between a pair of auxiliary contacts so that the movable contacts are brought into contact with the main contacts. Thus, arcing does not occur on the main contact, which may increase the life of the main contact and reduce the time and cost required for maintenance.
Description
Cross Reference to Related Applications
The present application claims priority and rights of korean patent application No. 10-2022-0125129 filed at the korean intellectual property office on the 9 th month 30 of 2022, the entire contents of which are incorporated herein by reference.
Technical Field
The present disclosure relates to a tap selector with arc inducing contacts, and more particularly, to a tap selector with arc inducing contacts in which an auxiliary contact makes contact with a movable contact to induce an arc and a main contact makes secondary contact with a movable contact to achieve electrical conduction when switching a load tap of an OLTC installed in an oil-immersed distribution transformer.
Background
When the load of a receiver in a power system increases or decreases, the transformer needs to adjust the voltage at the Primary Side (Primary Side) in order to maintain a constant power quality. An on-load tap changer (OLTC, i.e. a voltage regulator on the load) is connected to the main side (high voltage) tap winding for power distribution (22.9 kV to 40.5 kV), voltage and current are regulated by means of switching devices according to the winding ratio of the transformer in order to supply the appropriate voltage and current. That is, OLTC is a switching device that switches a circuit without shutting off power in a state where a load current flows. Typically, the voltage regulation range of the power distribution stage OLTC is 4% to 10%.
When OLTC is operated, the tap selector is moved by rotation of the drive motor by means of the associated structure of each drive member. In this case, when the change-over switch is operated, the windings are short-circuited between adjacent taps, and a circulating current occurs. OLTC in the prior art uses a method of extinguishing an arc only by using a Vacuum Interrupter (VI) when the tap is switched in insulating oil.
However, although this structure can extinguish the arc by VI, abrasion of the fixed contact in which the arc occurs, which is induced by the movable contact often coming into contact with the fixed contact, cannot be prevented.
A de-energized tap changer (DETC) is commonly used as an oil-immersed distribution transformer. There is only a difference between the power distribution stage OLTC product and the DETC product in terms of the automatic operation method (motor control) and the presence or absence of VI.
However, the configuration of the tap selector remains unchanged and all tap switching operations of the three-phase (U, V, W) transformer are performed by simple contact with and separation from the fixed contacts. In this process, in the OLTC configured such that the movable contact and the fixed contact are in direct contact with each other, there is a problem in that the main contact is damaged by an arc occurring between the movable contact and the fixed contact, which deteriorates electrical conduction efficiency and causes an increase in cost due to frequent maintenance and replacement.
[ related art literature ]
[ patent literature ]
(patent document 1) KR 10-2219309B1
(patent document 2) KR 10-2018-01010101559A
Disclosure of Invention
The present disclosure is directed to providing a tap selector with arc-induced contacts that improves a method of bringing movable contacts and fixed contacts into contact with each other when switching taps in an OLTC and minimizes wear of a main contact by binarizing materials, thereby increasing the mechanical life of the OLTC, reducing maintenance costs for a transformer, and improving economic benefits of an electric power system.
To this end, the present disclosure is directed to providing a tap selector having an arc inducing contact in which a fixed contact includes a main contact and an auxiliary contact, the auxiliary contact first contacting the movable contact before contact between the main contact and the movable contact, and pre-inducing the occurrence of an arc between the movable contact and the auxiliary contact, thereby preventing damage of the main contact due to the arc.
Exemplary embodiments of the present disclosure provide a tap selector having arc inducing contacts, the tap selector inducing an occurrence of an arc on an auxiliary contact when switching a load tap of an OLTC installed in an oil immersed distribution transformer, the tap selector comprising: a movable contact connected to the horizontal fixed rod (114) and configured to move horizontally; and a fixed contact configured to contact or separate from the movable contact by movement of the movable contact, wherein the movable contact includes: a power source side conductor (116) having an upper end fixed to the horizontal fixing rod (114), the power source side conductor (116) being configured to move together with the horizontal fixing rod (114); a spring (120) provided on the power source side conductor (116) and configured to absorb and relieve pressure generated at a timing when the movable contact and the fixed contact meet together; a movable member main contact (122) provided at a lower end of the power source side conductor (116) and extending forward; and a movable member auxiliary contact (124) provided at one end of the movable member main contact (122), and wherein the fixed contact includes: a fixed member main contact (128) positioned below the movable contact and connected to a distal end of the load side conductor (108); and a pair of fixed member auxiliary contacts (130) provided at an upper end of the fixed member main contact (128) and each having a rotatable roller shape.
The movable contact may further include a movable member contact surface (126) formed flat on a bottom surface of the movable member main contact (122), the fixed contact may further include a fixed member contact surface (132) formed flat on an upper surface of the fixed member main contact (128), and the movable member contact surface (126) and the fixed member contact surface (132) may be maintained in a contact state in a state in which the movable contact and the fixed contact are electrically connected.
When the movable contact is in contact with the fixed contact, the movable member auxiliary contact (124) may first be in contact with a first fixed member auxiliary contact of a pair of fixed member auxiliary contacts (130) and then be positioned between the pair of fixed member auxiliary contacts (130).
The movable contact may further include a conductor cover (118) configured to protect a surface of the power source side conductor (116).
According to the present disclosure, the auxiliary contacts provided in the form of rollers need to be first brought into contact with the main contacts and positioned between a pair of auxiliary contacts so that the movable contacts are brought into contact with the main contacts. Thus, arcing does not occur on the main contact, which may increase the life of the main contact and reduce the time and cost required for maintenance.
Drawings
Fig. 1 and 2 are perspective views illustrating a structure of a tap selector having contacts according to the present disclosure.
Fig. 3 is a perspective view illustrating the structure of an internal movable part of the tap selector.
Fig. 4 and 5 are enlarged perspective views illustrating the structure of the movable contact and the structure of the fixed contact.
Fig. 6 is a front view illustrating a contact state between the movable contact and the fixed contact.
Fig. 7 is a side view illustrating a contact state between the movable contact and the fixed contact.
Fig. 8 is a front view illustrating a process in which the movable contact is first brought into contact with the auxiliary contact.
Fig. 9 is a sectional view illustrating a state in which the movable contact is in contact with the main contact.
Detailed Description
Hereinafter, a "tap selector with arc-inducing contacts" (hereinafter, referred to as "tap selector") according to an embodiment of the present disclosure will be described with reference to the accompanying drawings.
Fig. 1 and 2 are perspective views illustrating a structure of a tap selector having contacts according to the present disclosure, fig. 3 is a perspective view illustrating a structure of an internal movable part of the tap selector, fig. 4 and 5 are enlarged perspective views illustrating a structure of a movable contact and a structure of a fixed contact, fig. 6 is a front view illustrating a contact state between the movable contact and the fixed contact, fig. 7 is a side view illustrating a contact state between the movable contact and the fixed contact, fig. 8 is a front view illustrating a process in which the movable contact is first contacted with an auxiliary contact, and fig. 9 is a cross-sectional view illustrating a state in which the movable contact is contacted with a main contact.
As illustrated in fig. 1 to 3, the present disclosure is characterized by providing a tap selector 100 including fixed contacts in which three-phase conductors are disposed at equal intervals and movable contacts configured to change conductive states to apply appropriate voltages and currents while reciprocating between the fixed contacts.
Front and rear stop plates 102, 104 are disposed in parallel at the front and rear sides of the tap selector, respectively. The transfer member 106 is movably disposed above the front barrier plate 102 and the rear barrier plate 104.
A plurality of load side conductors 108 are connected to the front barrier plate 102. One side of the load side conductor 108 is electrically connected to a load side power supply device such as a receiver. Further, the other side of the load side conductor 108 has a contact, and the contact selectively contacts the movable contact.
The connection arm 110 is provided at the lower end of the transmission member 106 and generates a rotational force, and the rotational force is transmitted to the crankshaft 112. Power is generated in the left/right direction by the rotation of the crankshaft 112, and the horizontal rod 114 can be moved left or right by the power.
The horizontal securing lever 114 moves in parallel to the left or right in the tap selector 100. A plurality of movable contacts are disposed on the horizontal stationary bar 114. In the case of the tap selector 100 of the present disclosure for use in a three-phase power plant, typically three movable contacts are provided on a single horizontal fixed bar 114.
In the structure and detailed description illustrated in the drawings of the present disclosure, the horizontal fixing rod 114 reciprocates leftward or rightward by the operation of the actuator. However, the method and structure for generating the driving force for the horizontal fixing lever 114 may be modified.
Fig. 4 and 5 illustrate detailed structures of the movable contact and the fixed contact.
In the present disclosure, a member that is connected to the horizontal fixed lever 114 and moves together with the horizontal fixed lever 114 will be referred to as a movable contact, and a member that is disposed at the distal end of the other side of the load side conductor 108 and is in contact with or separated from the movable contact by the movement of the movable contact will be referred to as a fixed contact.
The movable contacts include a power source side conductor 116, a conductor cover 118, a spring 120, a movable member main contact 122, a movable member auxiliary contact 124, and a movable member contact surface 126. Further, the fixed contacts include a fixed member main contact 128, a fixed member auxiliary contact 130, and a fixed member contact surface 132.
The upper end of the power supply side conductor 116 is fixed to the horizontal fixing lever 114, and when the horizontal fixing lever 114 moves, the power supply side conductor 116 moves together with the horizontal fixing lever 114. The distal end of the power source side conductor 116 is electrically connected to the power supply facility and serves as a path through which current flows.
The surface of the power supply side conductor 116 is protected by a conductor cover 118.
The spring 120 is provided on the power supply side conductor 116. The spring 120 serves to absorb and relieve the pressure generated at the moment when the movable contact meets the fixed contact. Thus, the spring 120 enables the movable contact to move while being gently brought into contact with the fixed contact. The contact between the movable contact and the fixed contact is maintained in a tightly attached state by the elastic force of the spring 120. Typically, a maximum of 5N vertical load is applied by means of the contacts to achieve electrical conduction. The spring 120 used in the present disclosure is a circular coil spring (material: SUS 405-WPB), and the model number of the spring 120 is C-VUR 5-30 (number of turns is 14, and compression domain is 7.5 mm). However, the present disclosure is not limited to this material and physical properties.
The movable member main contact 122 is provided at the lower end of the power supply side conductor 116. The movable member main contact 122 extends forward in a generally rod shape. However, the movable member main contact 122 may have a shape different from the above-described shape. Further, the movable member auxiliary contact 124 is detachably provided at one end of the movable member main contact 122.
Both the movable member main contact 122 and the movable member auxiliary contact 124 may be configured as conductors to enable electrical conduction. The movable member main contact 122 is a conductor for supplying main power to be supplied to the load side, and transfers current supplied from the power supply facility to the load side in a normal electrically conductive state.
Both the movable member main contact 122 and the movable member auxiliary contact 124 are each manufactured in the form of a rod having a predetermined cross-sectional shape and a predetermined size. The edges of each of the movable member main contact 122 and the movable member auxiliary contact 124 may have a gradually curved shape so as to achieve soft contact.
Since the movable member auxiliary contact 124 is subjected to initial contact and an arc occurs on the movable member auxiliary contact 124 at the time of switching tapping, the movable member auxiliary contact 124 is made of tungsten-copper alloy (W80%, cu 20%) having a high melting point.
In addition, in transformers filled with insulating oil, the movable part auxiliary contacts 124 are mainly used to prevent wear of the movable part main contacts 122 while VI is used to resist the occurrence of arcing at the same time when switching taps. In the case where the movable member auxiliary contact 124 is damaged due to wear or the like, only the movable member auxiliary contact 124 may be separated and replaced. However, the entire movable contact is typically replaced.
The movable member main contact 122 maximizes electrical conduction efficiency by using copper metal having excellent electrical conductivity.
For reference, regarding the properties of the material, the melting point of tungsten was 3,400 ℃, the melting point of copper was 1,085 ℃, and the electrical conductivity of tungsten was 1.82×10 7 And the conductivity of copper is 5.8X10 7 。
The movable member contact surface 126 is formed flat on the bottom surface of the movable member main contact 122. The movable member contact surface 126 serves as a main current moving path in a state where the movable contact and the fixed contact are in contact with each other.
At the same time, the fixed member main contact 128 is positioned below the movable contact and connected to the distal end of the load side conductor 108. The fixed member main contact 128 is also configured as a conductor made of copper or the like, and transmits electric power from the power source side conductor 116.
The fixed member main contact 128 has a predetermined volume, and the fixed member auxiliary contact 130 is provided at an upper end of the fixed member main contact 128. In the description of the present disclosure, the fixed member auxiliary contact 130 has a cylindrical roller shape, and the intermediate rotation shaft is disposed parallel to the central axes of the movable member main contact 122 and the load side conductor 108. However, the positions and arrangement directions of these components may be changed.
In addition, the fixed member auxiliary contacts 130 may be provided as a pair of fixed member auxiliary contacts 130 spaced apart from each other by a predetermined distance. The pair of fixed member auxiliary contacts 130 selectively contact the movable member auxiliary contacts 124. The pair of fixed member auxiliary contacts 130 may be arranged in the same direction as the moving direction of the movable member auxiliary contacts 124. The movable member auxiliary contact 124 may be in contact with the first fixed member auxiliary contact 130 during a process in which the movable contact is in contact with the fixed contact. Further, the movable member auxiliary contact 124 may be in contact with the second fixed member auxiliary contact 130 during a process in which the movable contact is separated from the fixed contact.
The fixed member auxiliary contact 130 is also configured as a conductor made of copper or the like.
The fixed member contact surface 132 is formed flat on the upper surface of the fixed member main contact 128. As illustrated in fig. 6 and 7, the fixed member contact surface 132 may be positioned between the pair of fixed member auxiliary contacts 130. The fixed member contact surface 132 is formed at a position corresponding to the movable member contact surface 126 in the lateral direction. Accordingly, in a state where the movable member contact surface 126 and the fixed member contact surface 132 are in contact with each other, the main current can be transmitted from the supply facility to the load side.
Fig. 8 illustrates a method of minimizing an arc by using the movable contact and the fixed contact having the above-described structure.
First, as illustrated in the first view in fig. 8, the movable contact moves toward the fixed contact. In this case, the movable contact is not electrically connected to the fixed contact, and the current is not supplied from the power supply facility to the load side.
As illustrated in the second view in fig. 8, the movable member auxiliary contact 124 and the fixed member auxiliary contact 130 first contact each other when the movable contact approaches the fixed contact. The first fixed member auxiliary contact 130 of the pair of fixed member auxiliary contacts 130 positioned close to the movable member auxiliary contact 124 is first brought into contact with the movable member auxiliary contact 124. At this point, an arc occurs due to contact between the two conductors. However, such an arc occurs only between the first fixed member auxiliary contact 130 and the movable member auxiliary contact 124, and the arc does not reach the other main contacts.
In this case, the arc is extinguished by the operation of VI and no longer occurs.
In this state, the spring 120 is compressed, and the movable member auxiliary contact 124 moves upward and climbs over the fixed member auxiliary contact 130 (third view in fig. 8). When the movable member auxiliary contact 124 climbs over the fixed member auxiliary contact 130, the movable member auxiliary contact 124 moves downward again by the compression force of the spring 120.
Further, when the movable member auxiliary contact 124 moves again (until the movable member auxiliary contact 124 is positioned between the pair of fixed member auxiliary contacts 130), the movable member contact surface 126 and the fixed member contact surface 132 contact each other. In addition, a normal current is supplied.
As described above, at the time of switching tapping, during the process in which the movable contact and the fixed contact are in contact with each other, an arc that may occur on the two contacts is caused to occur only between the two auxiliary contacts that correspond to each other, and an arc does not occur during the contact between the main contacts, thereby protecting the main contacts.
Although exemplary embodiments of the present disclosure have been described above with reference to the accompanying drawings, it will be understood by those skilled in the art that the above technical construction of the present disclosure may be embodied in other specific forms without changing the technical spirit or essential features of the present disclosure. It is therefore to be understood that the foregoing exemplary embodiments are described in all respects and not limited by the description, and that the scope of the disclosure is to be indicated by the appended claims, and all changes or modifications that come within the meaning and range of claims, and their equivalents, are intended to be embraced therein.
[ description of reference numerals ]
100: tapping selector
102: front baffle plate
104: rear baffle plate
106: conveying component
108: load side conductor
110: connecting arm
112: crankshaft
114: horizontal fixing rod
116: power supply side conductor
118: conductor cover
120: spring
122: main contact of movable part
124: movable part auxiliary contact
126: movable part contact surface
128: main contact of fixed part
130: auxiliary contact of fixed part
132: the fixed member contacts the surface.
Claims (4)
1. A tap selector having arc inducing contacts, the tap selector inducing an arc on auxiliary contacts when switching a load tap of an on-load tap changer installed in an oil-filled distribution transformer, the tap selector comprising:
a movable contact connected to a horizontal fixed rod (114) and configured to move horizontally; and
a fixed contact configured to contact or separate from the movable contact by movement of the movable contact,
wherein the movable contact includes:
a power supply side conductor (116), the power supply side conductor (116) having an upper end fixed to the horizontal fixing rod (114), the power supply side conductor (116) being configured to move together with the horizontal fixing rod (114);
a spring (120), the spring (120) being disposed on the power source side conductor (116) and configured to absorb and relieve pressure generated at a timing when the movable contact and the fixed contact meet together;
a movable member main contact (122), the movable member main contact (122) being provided at a lower end of the power source side conductor (116) and extending forward; and
a movable member auxiliary contact (124), the movable member auxiliary contact (124) being provided at one end of the movable member main contact (122), and
wherein, the fixed contact includes:
a fixed member main contact (128), the fixed member main contact (128) being positioned below the movable contact and connected to a distal end of a load side conductor (108); and
a pair of fixed member auxiliary contacts (130), the pair of fixed member auxiliary contacts (130) being provided at an upper end of the fixed member main contact (128) and each having a rotatable roller shape.
2. The tap selector of claim 1, wherein the movable contact further comprises a movable member contact surface (126) formed flat on a bottom surface of the movable member main contact (122),
wherein the fixed contact further comprises a fixed member contact surface (132) formed flat on an upper surface of the fixed member main contact (128), and
wherein the movable member contact surface (126) and the fixed member contact surface (132) maintain a contact state in a state in which the movable contact and the fixed contact are electrically connected.
3. The tap selector of claim 1, wherein when the movable contact is in contact with the fixed contact, the movable member auxiliary contact (124) is first in contact with a first fixed member auxiliary contact of the pair of fixed member auxiliary contacts (130) and then positioned between the pair of fixed member auxiliary contacts (130).
4. The tap selector of claim 1, wherein the movable contact further comprises a conductor cover (118) configured to protect a surface of the power supply side conductor (116).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2022-0125129 | 2022-09-30 | ||
| KR1020220125129A KR102547475B1 (en) | 2022-09-30 | 2022-09-30 | Tap selector with arc enticed contact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117809994A true CN117809994A (en) | 2024-04-02 |
Family
ID=86994060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311237147.8A Pending CN117809994A (en) | 2022-09-30 | 2023-09-25 | Tap selector with arc-inducing contacts |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR102547475B1 (en) |
| CN (1) | CN117809994A (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003188031A (en) * | 2001-12-18 | 2003-07-04 | Toshiba Corp | On-load tap changer |
| JP5286610B2 (en) * | 2009-04-27 | 2013-09-11 | 三菱電機株式会社 | Tap changer |
| DE202012101475U1 (en) * | 2012-04-20 | 2013-07-23 | Maschinenfabrik Reinhausen Gmbh | OLTC |
| DE102012103489B4 (en) * | 2012-04-20 | 2015-11-12 | Maschinenfabrik Reinhausen Gmbh | On-load tap-changer and its use for voltage regulation in a distribution transformer |
| DE102016104499B3 (en) | 2016-03-11 | 2017-04-27 | Maschinenfabrik Reinhausen Gmbh | Selector for an on-load tap-changer and on-load tap-changer with diverter switch and selector |
| KR102219309B1 (en) | 2020-11-13 | 2021-02-24 | 한국에너지솔루션 주식회사 | Transformer Using Electric Power Distribution Smart OLTC |
-
2022
- 2022-09-30 KR KR1020220125129A patent/KR102547475B1/en active IP Right Grant
-
2023
- 2023-09-25 CN CN202311237147.8A patent/CN117809994A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR102547475B1 (en) | 2023-06-28 |
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