WO2011029251A1

WO2011029251A1 - Non-excitation cage-shaped voltage-regulation tap changer for transformer

Info

Publication number: WO2011029251A1
Application number: PCT/CN2009/075696
Authority: WO
Inventors: 秦伟
Original assignee: 武汉泰普变压器开关有限公司
Priority date: 2009-09-08
Filing date: 2009-12-18
Publication date: 2011-03-17
Also published as: CN101692392B; DE112009005212B4; DE112009005212T5; CN101692392A

Abstract

A non-excitation cage-shaped voltage-regulation tap changer for a transformer. Each phase of the tap changer has two cage bodies. One of the cage bodies has annular fixed contacts (7-1) linked with main winding taps (K) and annular fixed contacts (7-3) linked with voltage-regulation winding taps, which are in equal numbers and spaced staggeringly apart from each other longitudinally. The other cage body has output (X) annular fixed contacts (7-2) and annular fixed contacts (7-4) connected with voltage-regulation winding taps, which are in equal numbers and spaced staggeringly apart from each other longitudinally. Two groups of annular fixed contact (7-3, 7-4) linked with connecting positions corresponding to the voltage-regulating winding taps are connected with each other. Movable contact assemblies (6) of two cage bodies are correspondingly arranged and moved opposite to each other in upward and downward directions. The tap changer has a simple and compact structure, small volume, and better rigidity. The voltage of a large current tap changer can be regulated.

Description

Technical field

The invention relates to a non-excitation positive and negative pressure regulating tap changer for a transformer, which is a further improvement of the existing non-excited cage tap changer.

Background technique

In the Chinese utility model patent specification with the authorization bulletin number CN200944364Y, a non-exciting cage-shaped tap changer is disclosed, which is characterized in that the annular static contact is distributed along the axial direction, and the annular static contact is fixed in the circumferential direction by the outer circle. On each of the insulating rods, it also acts as a mechanical reinforcement of the cage insulator formed of the insulating material, and the movable contact slides up and down in the ring of the annular static contact to bridge the two adjacent static contacts, thereby realizing the voltage regulation. Features. The switch achieves high current and rigidity. The switch has only one set of moving contacts in each phase of the cage, which can only achieve linear voltage regulation or central voltage regulation. However, the market often needs positive and negative pressure regulation, and the existing structure cannot be realized. The use range of the large current tap changer is limited. Summary of the invention

The technical problem to be solved by the present invention is to avoid the deficiencies of the prior art and to provide a non-excited cage-shaped positive and negative pressure regulating tap changer with large carrying current, good rigidity, small height dimension and simple and reliable structure.

The technical solution adopted by the present invention to solve the above-mentioned problems is as follows: the upper and lower supports 2, 3 are provided, and the insulating rods 4 are circumferentially coupled between the upper and lower supports, and the annular static is arranged along the axial interval of the insulating rods. The contact 7 is provided with a movable contact assembly between the upper and lower supports and the inner side of the annular static contact, the movable contact assembly is connected with the upper and lower transmission devices, and the upper and lower transmission devices are connected with the operating mechanism 1, and the movable contact assembly 6 The outer circumference corresponding to the annular static contact is provided with a movable contact bridging the adjacent two static contacts to form a cage tap changer, wherein the cage tap changer corresponds to each phase of the switch Two cages are arranged in parallel, and the two cages are integrally connected by the upper and lower supports to form two groups of corresponding cages, wherein one group of cages is provided with annular fixed contacts 7-1 connected to the main coil tap K And the annular static contact 7-3 connected to the tap of the voltage regulating coil, and the annular fixed contact 7-1 connecting the main coil tap K and the annular static contact 7-3 connected to the tap of the regulating coil are equal in number and arranged at intervals , another component switch has an output X ring The static contact 7-2 and the annular static contact 7-4 connected to the tap of the voltage regulating coil, and the output X annular fixed contact 7-2 and the annular fixed contact 7-4 connected to the tap of the regulating coil are equal in number and up and down Arranged at staggered intervals, two sets of annular static contacts 7-3, 7-4 connected to the corresponding coupling positions of the voltage regulating coil taps are connected or connected integrally, and the movable contact assemblies of the two sets of cage bodies are correspondingly arranged and Move up and down in opposite directions.

According to the above scheme, the annular static contacts of the two sets of cages have the same axial separation distance, and the corresponding two sets of annular fixed contacts are in the same level and equal position.

According to the above scheme, the upper and lower transmissions of the two groups of cages are connected with an operating mechanism to control two sets of dynamic touches. The head assembly moves up and down in reverse.

According to the above scheme, the upper and lower transmission device is a screw type upper and lower transmission device, which comprises a transmission screw 5 which is worn between the upper and lower supports, and the upper part of the transmission screw is connected with the operating mechanism 1, the transmission screw and the moving contact assembly. 6-linked screw sleeve phase configuration, the screw sleeve is connected or connected to the support member, and the movable contact is arranged on the outer periphery of the support member.

According to the above scheme, the guide member 13 is disposed on the outer circumference of the movable contact assembly, and the guide groove is disposed on the inner side of the annular static contact.

15.

According to the above scheme, the set of cages is provided with three annular fixed contacts 7-1 connected to the main coil tap K and three annular fixed contacts 7-3 connected to the tapping coil taps, staggered from top to bottom. The interval is set in the order of K, 3, Κ, 2, Κ, 1, and the other group of cages is provided with 3 output X-ring static contacts 7-2 and 3 annular static contacts 7 connected to the voltage-regulating coil taps. 4. The order of the top-down staggered interval is X, 3, X, 2, X, 1, which constitutes the 5-speed positive and negative voltage tap-changer.

According to the above scheme, the set of cages is provided with four annular fixed contacts 7-1 connected to the main coil taps and four annular fixed contacts 7-3 connected to the regulating coil taps, staggered from top to bottom. The order of the interval setting is Κ, 4, Κ, 3, Κ, 2, Κ, 1, and the other group of cages is provided with 4 output X-ring static contacts 7-2 and 4 ring-connected thermostatic coil taps. The contacts 7-4 are arranged in the order of X, 4, X, 3, X, 2, X, and 1, from the top to the bottom, and constitute a 7-speed forward and reverse voltage tap changer.

According to the above scheme, the two groups of cages in each phase are a pair, and 1 to 3 pairs can be arranged along the axial or parallel direction of the tap changer to form a single-phase or multi-phase tap changer.

The beneficial effects of the invention are as follows: 1. Two cage tap changers are organically integrated, by respectively providing annular static contacts and output annular static contacts coupled to the main coil taps and annular static contacts connecting the pressure regulating coils The phase configuration realizes the positive and negative pressure regulation of the large current tap changer, so that the application range of the large current cage tap changer is further broadened; 2. The invention has the advantages of simple and compact structure, small volume, good rigidity, reasonable setting and reliable performance. .

DRAWINGS

Figure 1 is a front elevational view of one embodiment of the present invention.

Figure 2 is a cross-sectional view of the Ε-Ε of Figure 1.

Figure 3 is a cross-sectional view taken along the line F-F of Figure 1.

Figure 4 is a cross-sectional view taken along line G-G of Figure 2;

Fig. 5 is a schematic diagram of the wiring of the structure of Fig. 1, and the gear position is I.

detailed description

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, 2, 3, 4, 5, it is a single-phase five-position non-excited cage positive and negative pressure regulating tap changer, as shown in Figure 1. The switch is in the 3rd gear position. The whole tap changer is composed of two cages on the left and the right. The two cages are connected together by the upper and lower supports to form two groups of corresponding cages. Each group of cages includes a common upper and lower support 2 and 3 weeks. To the cage insulator formed by the connected insulating rods 4, annular annular contacts 7 are arranged along the axial direction of the insulating rod, and the outer circumference of the annular static contact is connected with the insulating rod 4 through the bolts 12, and the ring of the two sets of cages The static contact axial spacing distance is the same, wherein one set of cages is provided with three annular static contacts 7-1 connecting the main coil taps K and three annular static contacts 7-3 connected to the regulating coil taps, and are connected The annular fixed contact 7-1 of the main coil tap K and the annular fixed contact 7-3 connected to the tap of the regulating coil are equal in number and arranged at intervals, and the three annular fixed contacts 7-1 of the main coil tap K are connected from The upper and lower layers are arranged on the 1, 3, and 5 layers, and the three annular static contacts 7-3 connected to the voltage regulating coil taps are arranged on the 2, 4, and 6 layers, and the order of the staggered intervals from top to bottom is 3, K. 2, Κ, 1, another group of cages with 3 output X-ring static contacts 7-2 and 3 connected pressure-regulating coils The annular fixed contact 7-4 of the head, and the output X-ring fixed contact 7-2 and the annular fixed contact 7-4 connected to the tap of the regulating coil are equal in number and arranged at intervals, 3 output X-ring static contacts 7-2 is set from the top to the bottom in the 1, 3, 5 layers, and the three ring-shaped static contacts 7-4 connected to the voltage-regulating coil taps are set on the 2nd, 4th, and 6th layers, and the order of the staggered intervals from top to bottom is X, 3, X, 2, X, 1, two sets of annular static contacts 7-3, 7-4 connected to the corresponding connection position of the voltage regulating coil tap are in the upper and lower positions of the same layer and are connected in one body, which is "8""Zigzag, the two sets of cages are organically coupled together, further strengthening the rigidity and integrity of the switch, or axially misaligned and achieving an equidistant connection through the connecting member 14, and the outer side of the annular static contact of the tap of the regulating coil is provided. The terminal 10 is connected to the voltage regulating coil tap of the corresponding coupling position; the annular static contact 7-1 and the output X annular static contact 7-2 connected to the main coil tap are located at the same level and spaced apart from each other. Separating, the interval forming an oil gap 8 between the two stationary contacts, connecting the annular fixed contact 7-1 of the main coil tap 和 and The output X-ring static contacts 7-2 are respectively short-circuited through the connecting piece 11, and are respectively connected to the main coil and the output joint through the connecting piece; the movable contact is arranged between the upper and lower supports and the inner side of the annular fixed contact The movable contact assembly is composed of a support member 16 and a movable contact disposed on the outer periphery of the support member, and the movable contact of the movable contact assembly 6 is bridged with the adjacent two static contacts; The assembly is coupled to the upper and lower transmissions, wherein the upper and lower transmissions are screw-type upper and lower transmissions, including a transmission screw 5 that is worn between the upper and lower supports, and the upper part of the transmission screw is connected to the operating mechanism 1, the transmission screw and The threaded sleeve assembly 6 is arranged with a screw sleeve phase, and the screw sleeve is connected or connected with the support member. In this embodiment, the two screw shafts have opposite spiral directions, and the upper portions of the two transmission screws pass through the gear pair and one The operating mechanism is connected, and the two movable contact assemblies are controlled to move up and down synchronously, and the two movable contact assemblies are respectively moved, and the corresponding working positions of the shifting positions are I, II, III, IV, V (shown in Table 1). a guide 13 is disposed on an outer circumference of the movable contact assembly, An annular fixed contact disposed inside the corresponding guide grooves 15, the vertical guide member to run along the guide groove to prevent rotation of movable contact assembly. In addition, an insulating support ring 9 may be coupled to the cage insulator formed by the insulating rod 4 to enhance the rigidity of the cage insulator.

Table 1

If the 7-speed and 9-speed switches are formed, the height of the cage body can be increased accordingly and the number of dynamic contact static contacts can be increased according to the above principle.

The heightening switch of the invention is repeatedly arranged in the lower part of the single-phase switch 2~3, and the above-mentioned dynamic and static contact structure constitutes a two- or three-phase switch. If the outer diameter is increased and the above switches are repeatedly arranged in parallel, a multi-phase switch can also be constructed.

The invention is particularly suitable for high voltage, high current switching, and can meet the needs of large and special type transformers.

Claims

Claim

1. A non-excited cage-shaped positive and negative pressure regulating tap changer for a transformer, comprising an upper and a lower support, an insulating rod is circumferentially coupled between the upper and lower supports, and an annular static touch is arranged along the axial interval of the insulating rod. a moving contact assembly is arranged between the upper and lower supports and the inner side of the annular static contact, the movable contact assembly is connected with the upper and lower transmissions, and the upper and lower transmissions are connected with the operating mechanism, and the outer circumference of the movable contact assembly corresponds to the ring. The static contact is provided with a movable contact bridging the adjacent two static contacts to form a cage tap changer, wherein: the cage tap changer is provided with two cages in parallel for each phase of the switch. The two cages are connected together by the upper and lower supports to form two groups of corresponding cages, wherein one group of cages is provided with annular static contacts (7-1) and couplings connected to the main coil taps K. The annular fixed contact (7-3) of the coil tap is connected, and the annular fixed contact (7-1) connecting the main coil tap K and the annular fixed contact (7-3) connected to the tap of the regulating coil are equal in number and up and down Interlaced interval setting, another component switch with output X Annular static contact (7-2) and annular static contact (7-4) connected to the tap of the regulating coil, and output X-ring static contact (7-2) and annular static contact connecting the tap of the regulating coil ( 7-4) The number of equal and up-and-down staggered intervals, the two sets of annular static contacts (7-3, 7-4) connected to the corresponding joints of the voltage regulating coil taps are connected or connected together, the two groups The moving contact assembly of the cage is correspondingly arranged and the direction of movement up and down is opposite.

2. The non-excited cage-shaped positive and negative pressure regulating tap changer for a transformer according to claim 1, wherein: the annular static contacts of the two sets of cage bodies have the same axial separation distance, and the two groups correspond to each other. The annular static contacts are in the same level of the same layer.

3. The non-excited cage-shaped positive and negative pressure regulating tap changer for a transformer according to claim 1 or 2, wherein: the upper and lower transmissions of the two sets of cage bodies are associated with an operating mechanism, and two The movable contact assembly moves up and down synchronously.

The non-excited cage-shaped positive and negative pressure regulating tap changer for a transformer according to claim 1 or 2, wherein: the upper and lower transmission devices are screw-type upper and lower transmission devices, including the upper and lower branches. The transmission screw between the seats, the upper part of the transmission screw is connected with the operating mechanism, the transmission screw is arranged with the screw sleeve connected with the moving contact assembly, the screw sleeve is connected or connected with the support member, and the support member is installed at the periphery. Contact.

The non-excited cage-shaped positive and negative pressure regulating tap changer for a transformer according to claim 4, wherein: a guide member is disposed on an outer circumference of the movable contact assembly, and a guide groove is disposed on an inner side of the annular fixed contact.

The non-excited cage-shaped forward and reverse pressure regulating tap changer for a transformer according to claim 1 or 2, wherein: said set of cage bodies are provided with three annular static contacts connected to the main coil tap K (7-1) and three annular static contacts (7-3) connected to the tap of the regulating coil, the order of the top-down staggered interval is K, 3, Κ, 2, Κ, 1, another group of cages The body is provided with three output X-ring static contacts (7-2) and three annular static contacts (7-4) connected to the voltage-regulating coil taps. The order of the top-down staggered intervals is X, 3, X. 2, X, 1, constitute a 5-speed positive and negative pressure tap-changer.

The non-excited cage-shaped positive and negative pressure regulating tap changer for a transformer according to claim 1 or 2, wherein: said set of cage bodies are provided with four annular static contacts connected to the main coil tap K (7-1) and 4 annular static contacts (7-3) connected to the tap of the regulating coil, the order of the top-down staggered interval is K, 4, Κ, 3, Κ, 2, Κ, 1, The other set of cages is provided with four output X-ring fixed contacts (7-2) and four annular fixed contacts (7-4) connected to the taps of the regulating coils, and the order of the staggered intervals from top to bottom is X. 4, X, 3, X, 2, X, 1, constitute a 7-speed positive and negative pressure tap-changer.

The non-excited cage-shaped positive and negative pressure regulating tap changer for a transformer according to claim 1 or 2, wherein: the two sets of the cages of each phase are a pair, which can be along the axial direction of the tap changer Or set the 1~3 pairs in the parallel direction to form a single-phase or multi-phase tap changer.

9. The non-excited cage-shaped positive and negative pressure regulating tap changer for a transformer according to claim 2, wherein: two sets of annular static contacts (7-3, 7-) connected to corresponding positions of the voltage regulating coil taps. 4) It is in the upper and lower position of the same layer and is connected in one body, which is in the shape of "8". The outer side of the annular static contact connected to the tap of the pressure regulating coil is provided with the connection terminal and the tap of the voltage regulating coil corresponding to the corresponding connection position respectively; The annular fixed contact (7-1) of the coil tap and the output X annular fixed contact (7-2) are located at the upper and lower positions of the same layer and are spaced apart from each other, and the intervals form an oil gap between the two stationary contacts. The annular fixed contact (7-1) and the output X-ring fixed contact (7-2) connected to the main coil tap 短 are short-circuited by the connecting piece phase, respectively.

The non-excited cage-shaped forward and reverse pressure regulating tap changer for a transformer according to claim 1 or 2, wherein the insulating support ring is coupled to the cage insulator formed by the insulating rod.