DE1711227U - SECOND-SIDE SWITCHABLE CURRENT CONVERTER WITH DIFFERENT AWNUMBERS BUT THE SAME BUILDING AND THE SAME OVERCURRENT CURRENT. - Google Patents

Description

PATENT ADVOCATE
· - DIPL.-ING.

HELMUT G-CRTZ

Schncdcenhcisi ;. 27 - Te ^ 6 54 M

MEASURING CONVERTER - BATJ GmbH ₀ , Bamberg

Current transformer with different AWs that can be switched on the secondary side Numbers but the same burden and the same overcurrent figure «

The H & aerang relates to a current transformer which guarantees the same overcurrent difference with the same load despite different numbers of amperages "

With the known current transformers ^ * those to achieve different "Measuring ranges with a constant burden, for example a Stroasaessinstruinent * are designed to be secondary switchable * the overcurrent difference in the individual areas is different, there the operation also feels at the different number of ampere turns is at different points on the magnetization curve «

For such cases, the use of a saturation choke is known, - which is connected in parallel across the Börde and the currents over the Bennstrosi area are limited to the desired value by high power consumption - the saturation choke, however, influences the measurement accuracy of the Wanalsre in HennstrODgebiet ,. In addition, this throttle causes "additional core material> an increased scarce requirement and higher costs,"

It has also been proposed for specific converter without measuring range change ^ susammenzubauen the iron core of the reactor with the current transformer core and provided with an additional, geaieinsamen with the latter winding "This swar be reduced the disadvantages mentioned, but" converter v mit'verschiedenen.-Imperewindurigszahlen? iron trots all of these dimensions, different transmission levels, and the desired low temperature difference can only be achieved in a single range.

When current transformer after the acidification., This Geesthacht ropes are characterized that _s avoided its iron core of several partial cores in common primary winding consists whose number corresponds to the number of different ampere turns and partly partly mounted, their secondary windings in legs parallel and are partly kurzauschliessen and each number of turns have, which correspond to the selected secondary voltage circuit and the assigned dimensioned cross-sections of the active filing cores in such a way that the same overcurrent figure is always achieved. ■ '"· ■''

In the case of current transformers with three or more ampere- turn numbers , the leueruag stipulates that all partial cores have separate secondary windings with the partial core transverse sections having an inversely proportional number of turns, which are connected in parallel as required and are dimensioned so that the sum of the partial currents for all AW numbers is the desired Secondary current results in ο the windings of the partial cores not required for the number of ampere-turns used must be short-circuited within themselves.

Bsi current transformer ^, for operation with only two Amperewinaungssahlen can be made after the control . The device so that the first partial core, both with a winding for the low al? also with one winding for the high Amperewindungssahl and the second i-iilksrn only with one winding for the low Amperewisciur-eiCDaL-. is equipped, and that when operating the converter aii low ampere-turns the first winding of the srstsr. Part & arnes in legs with the winding of the sweiten • £ etikerii £ s IMD sweite Wicklting of ersterA part of the core parallel to the T / ICLK "Jing the second ieilkernee is switched while ds Operating? Ys ^r andlere high Amperewin-aungsz & hi by operating a change-over switch the two windings of the first rope core in. Helhfi; switched and the "winding of the second partial core is short-circuited "

Further invention features and the two described below and the floodplain depicted in the drawings » Guide examples and the following description can be found «,

It «own»

FIG. 1 shows a current transformer based on the invention for three Aaperewindungtsmühlen,

Figure 2, the so holding pushes the associated shift drum in the development in the gusts «, and

Pigur 3 "inen current transformer according to the invention for two

The core of the current transformer * according to Pigur 1 is divided into three cable cores 1, Z ₉ 3 » which« have a common primary winding 4 with the connections K, X « Each core 1, 2, 3 has a special secondary winding 5, &» 7, whose beginnings are electrically connected to one another and to both the load connection terminal k ale and z * £. The end of the winding 5 is led to the fixed connection 9, the end of the winding 6 is led to the fixed connection 10 _{9 and} the end of the winding 7 is led to the fixed connection 11. The end of the winding 7 is at the same time connected _{9 to the burden connector 1}

The one corresponding to the smallest number of ampere turns The lug connection is made so rich; that the tab

12 (Pig * 2) connects the connections 9f 10 and 11 to one another; in this position the three windings 5, 6 "7 are connected in parallel"

In the measuring range corresponding to the mean number of ampere turns, the link connection is changed so that the link

13 connects the connections 8 and 9 and the tab 14 connects the connections 10 and 11 to one another. In this switch position, the windings 6 and 7 are connected in parallel and the winding 5 is short-circuited

With the measuring range corresponding to the high amperage eohlieeslieb the Laechexaune attitude is made in such a way that the tab 15 connects the connections 8, 9 and 10 and thereby the ffioculations 5 and 6 short-circuited «Only that remains effective here Winding 7.

In each of the three switching positions, just as many partial cores are used »ale sum Err ei without η eier because the overcurrent difference caused by induction is necessary, The number of turns of the partial cores is inversely proportional to the (direction finding core cross-sections and selected so that the sum of the partial currents of each parallel-connected partial cores iiamer results in the desired secondary current »

In the exemplary embodiment according to FIG. 3 for a current transformer according to the Srfinduag for only two ampere turns, the core is divided into the silver cores 16 and 17. The PrioSrwicklung 18 connected to the terminals K and Ii eating the two 2? Eilkernen 16 and 17 together, the divided core 16 is a t two windings equipped $ a 19 for the low Amperewindungezahl UNFI the other 20 to 19 in series circuit lor the high _e The beginning of winding 19 is AIT the Mraenanschlussklemme _s k their end with the * terminal 21 of a single-pole DiaschalterB 25 as well as with äem start of the winding 20 is connected "the agent terminal 22 dee changeover switch 25 has with deis start of the winding 24 Dess core 17 'which for the low Asperewizxäungssahl is designed, connection »Pie ends of the windings 20 and 24 and the connection 23 of the switch 25 are connected to the uürdenanechlusskleio & ie i»

In the circuit for the low number of ampere turns, the switch 25 connects its connections 21 vtnü 22 _O. The windings TS * 24 for the low number of ampere turns of both cores 16, 17 are connected in series? Cores and windings are dimensioned in such a way that the winding 20 lying parallel a '& eu is currentless ο

To switch to the high Amper © number of turns, the with The switch blade connected to connection 2 is placed on connection 23 * The winding 24 is now short-circuited and the windings 19 and 20 are connected in series. The copper cross section the winding 24 misses for the high number of ampere turns measured current occurring

Claims (1)

β - U Current transformer, which with the same burden trots different Number of ampere turns ensures the same overcurrent figure, characterized in that its iron core is made there is more than one rope with a common primary winding * their look! the number of different ampere turns corresponds and their secondary windings parts in series » partly switch on in parallel and partly on course and each have 7 digits, plural marriage of each £ s? Wäiil "i? - ;, Sefcunaärwlosiungsschaitung and the associated possessed: ·; The cross-sections of the active rope cores that always got the same overstroa figure will c Current transformer according to claim 1, characterized _s that all iPsilkeme separate secondary windings with aeri Teilkez ^ iausrschnitten inversely proportional Windungssahlen wear that are geschaltet- parallel as needed and so böSLossGi: sindf that the Suiame the I'eilströme all AW-2ahlen the desired Secondary trojs results » ο Current transformer according to claim 1, for operation with two Asperewindungssahlejif characterized in that the first partial core both old a winding for the low and one for the high Amperewindingsahi and the "wide! Boundary core saw only one .winding for the low Amperewindingssahi! is equipped, and that when the converter is operated with a low number of ampere-turns, the first winding of the first cable core is connected in series with the winding of the second cable core & the wide winding of the first partial core is connected in parallel to the winding of the second partial core, while when operating the converter with high imperewindingsahl By pressing a door switch, the two WicKLungez of the first part core connected in series. the winding of the second Seilkenies is short-circuited in itself