CN1010902B

CN1010902B - Step transformer with central tapping

Info

Publication number: CN1010902B
Application number: CN86104379A
Authority: CN
Inventors: 卡尔·斯坦泽尔
Original assignee: Maschinenfabrik Reinhausen GmbH
Current assignee: Maschinenfabrik Reinhausen GmbH
Priority date: 1985-08-21
Filing date: 1986-06-26
Publication date: 1990-12-19
Also published as: ATE52875T1; CN86104379A; DE3671323D1; EP0213461A1; DE3529886A1; JPH0646615B2; JPS6245106A; EP0213461B1

Abstract

. Tapped transformer, in which the winding of each phase is split in its centre and each winding part is provided from this centre outwards with several taps, which are switchable in and out in sequence by means of a selector switch, to the stationary tap contacts arranged in a circle of which the taps are connected and the movable contacts of which are pivotable from tap contact to tap contact about the center of the circle, characterised thereby, that the selector switch is a load diverter switch, which is operable under load and in which the taps of both the winding parts are connected in opposite sequence to the stationary contacts and in which the movable contacts are constantly in engagement with an annular lead-out contact, wherein the annular lead-out contact is subdivided into two parts, the first part of which is associated with the tap contacts of the first winding part and the second part of which is associated with the tap contacts of the second winding part, wherein the first part of the lead-out contact is electrically connected with the last tap as seen from the centre of the second winding part, while the second part of the lead-out contact is connected with the first tap as seen from the centre - of the first winding part, and wherein the movable contacts, simultaneously with their change from the tap contact of the first tap of the first winding part to the tap contact of the last tap of the second winding part, change without interruption from the first part to the second part of the lead-out contact.

Description

Step transformer with central tapping

What the present invention relates to is a grading adjustable transformer, in this grading adjustable transformer, the winding of each phase place separates from its center, each winding part is extracted a plurality of taps out from its center, utilize a selector switch, its fixing grading contact and the tap of arranging with garden shape is connected, and its movably contact head can be round the garden central point, rotate to another grading contact from a grading contact, connect or disconnect in order.

Usually this class grading adjustable transformer is equipped with the centre cap transducer, and this centre cap transducer only could be operated when transformer opens circuit.Therefore, must disconnect transformer frequently for regulation voltage.The electric power system modernization has caused bigger energy density and stronger networking interconnected, exists such necessity promptly: use more in existing networking and regulate transformer, promptly can carry out the transformer of voltage-regulation under loaded situation.Only being used in the transformer that can regulate under the loading condition replaces transformer that tap change is housed yes very expensive.Therefore people make great efforts to replace existing tap change with a load selector in this class transformer.When transformer has the star point tap, generally can not cause too big difficulty.Yet, just different when transformer has centre cap, because at this moment two of each phase different taps must be interconnective.This just makes and goes up mutually at each, must use or two load selectors or a bipolarity load selector.Like this, price is very expensive, and does not fail owing to there being the locus to lay load selector through regular meeting.

Therefore, task of the present invention just is: particularly the transformer that the centre cap transducer is housed is reequiped, make it not only aspect expensive but also all be significantly improved aspect the requisite space position, this task is by being feature according to claim 1 of the present invention, and the described at the beginning grading adjustable transformer of this paper is finished.

The decisive advantage that the present invention has is: for the repacking with centre tapped grading adjustable transformer, the current load selector of form usually can be applied.Therefore, just no longer need use two load selectors on mutually, perhaps use a bipolarity load selector on mutually, need not transformer is carried out bigger repacking, just can replace original tap change with load selector at each at each.It also is feasible using an additional load selector.

Claim 2 has illustrated a kind of remodeling that conforms with purpose of applied load selector.Embodiments of the invention are described with the diagram circuit arrangement map in the accompanying drawings.

Fig. 1 represents: the layout (minimum voltage location) in tap 1 service position.

Fig. 2 represents: when the layout of transfer process when tap 3 turns to tap 4.

Can find out obviously that as figure grading adjustable transformer has two winding W ₁, W ₂, each winding all has three taps 1,2,3 and 4,5,6, the close center M of these taps, the grading contact K that each of these taps and load selector is fixing ₁, K ₂, K ₃And K ₄, K ₅, K ₆Be connected.Grading contact K ₁To K ₆Usually arrange with garden week form.Load selector has a movably contact head system 10, the contact head system is round garden week central point, can move to next grading contact from a grading contact, this movably the contact head system have a main contact head 11 and two resistance contact heads 12 and a movable contact 13, movable contact 13 and dimeric annular

conduction contact ring

14,15 are connected.Main here contact head 11 directly is connected with movable contact 13, and resistance contact head 12 then respectively connects a cross-over connection resistance 16 backs therebetween and is connected with movable contact 13.Annular conduction contact ring-as top said-be divided into two parts, its first 14 is with grading contact K ₁To K ₃Relevant, it and winding W ₂Deep tap 4 is electrically connected, and the second portion 15 of movable contact is with grading contact K ₄, K ₅, K ₆Relevant, and with the first winding W ₁The tap 3 that is positioned at center M is electrically connected.

Represented position is minimum voltage location in Fig. 1.Electric current is from tap 1 process grading contact K ₁, main contact head 11, movable contact 13 and conduction contact ring 14 arrive tap 4.Winding part between these two taps is all thrown away.In order to be transformed into next high voltage level, movably contact head system 10 is from grading contact K ₁Move to grading contact K ₂Usually will make two grading contact K this moment ₁And K ₂Cross-over connection in short-term, in the resistance contact head 12 is still at grading contact K at this moment ₁On, and another resistance contact head 12 has arrived grading contact K ₂Go up (comparison diagram 2).In case movably the service position of contact head system 10 arrives grading contact K ₂When last, clearly, the winding part between tap 1 and the tap 2 has just been connected, and the voltage of grading adjustable transformer has just correspondingly improved, when continuing to connect grading contact K ₃, the winding part between tap 2 and the tap 3 just has been switched on, and makes voltage continue out height.Fig. 2 represents that movably contact head system 10 is from grading contact K ₃To grading contact K ₄Conversion.Along with this conversion, movable contact 13 also transforms to conduction contact ring 15 from conduction contact ring 14, if electric current is originally from tap 3 process grading contact K ₃Flow to tap 4 with conduction contact ring 14, so finished this conversion with after-current just from tap 3 through conducting electricity contact ring 15 and grading contact K ₄Flow to tap 4.This switch process means the variation that does not have voltage on grading adjustable transformer, next switch process, and promptly removable contact head system is from grading contact K ₄Move to grading contact K ₅, the winding between the tap 4 and 5 has been switched on thus, and voltage continues to raise, and movably contact system moves to grading contact K at last ₆On, just can reach the highest voltage location.

Because movably the contact head system is from grading contact K ₃Be transformed into grading contact K ₄The time, some electric current is also through two

parts

14 and 15 of conduction contact ring, so meanwhile, movable contact 13 electrically contacts ring 15 conversions of carrying out from conduction contact ring 14 guides does not have electric current, therefore,

conduction contact ring

14,15 corresponding two ends 17 have also adopted the material of anti-oxidant scaling loss as two ends 18 of movable contact 13.

Clearly, whole contact heads of describing among the figure all are positioned on the plane, yet never must be this situation in practical structures, can be positioned at grading contact K with garden week shape stationary arrangement such as conduction contact ring 14,15 ₁-K ₆On or under the plane on, and these movably contact head can make the roller bearing bridge-type, structure also never is limited to progression as shown in the figure.

Claims

1, grading adjustable transformer, in this grading adjustable transformer, the winding of each phase place separates from its center, each winding part (W ₁, W ₂) extract a plurality of taps (1～3,4～6) out from its center, utilize a selector switch, its fixing grading contact (K with the arrangement of garden shape ₁～K ₆) be connected with moving contact (10), and its movably contact head can be round the garden central point, from a grading contact (K ₁～K ₆) rotate to another grading contact (K ₁～K ₆), connect or disconnect in order,

It is characterized in that:

Two winding part (W ₁, W ₂) tap (1,2,3 or 6,5,4) according to rightabout order and fixing grading contact (K ₁, K ₂, K ₃Perhaps K ₆, K ₅, K ₄) be connected, annular conduction contact ring is divided into two parts (14,15), and its first (14) is with first winding part (W ₁) grading contact (K ₁, K ₂, K ₃) relevant, its second portion (15) is then with second winding part (W ₂) grading contact (K ₄, K ₅, K ₆) relevant, wherein, the first (14) of conduction contact ring and second winding part (W ₂) from the center (M) to look be that a last tap (4) is electrically connected, and the second portion (15) of conduction contact ring and first winding part (W ₁) to look from the center be that first tap (3) is electrically connected, wherein movably contact head system (10) from the first winding (W ₁) the grading contact (K of first tap (3) ₃) be transformed into the second winding (W ₂) the grading contact (K of last tap (4) ₄) time, carrying out first (14) from the conduction contact ring not interruptedly to the conversion of second portion (15).

2, according to the grading adjustable transformer of claim 1, it is characterized in that: the end (17) of cross-over connection two conductions contact ring (14,15) in the switching process, and the part (13) that removable contact head system (10) is meshed with (17) all is to make with erosion-resisting contact material (17,18).