US1635042A - Reactor - Google Patents

Description

July

J. s. HEBREW ET AL' REACTOR.

I"iled May 1l' 1925 w f s@ RH O T5 .N EIN 0 J Y Y B mlm llrllh lil f ummmml nu 11+ I uw ATTORNEY wnNEssEs: Maan Y yim Puente! .ialy5,`1927.1

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- Ourinvention relatesto electrical protective devices and particularly to reactors for y transformers and other electrical devices,

- One object of rour invention isto 'provide v45 a reactor of thethroughconductor type. l

Another object of our-`inventi`on is to Lprowindin f- Anotliser ob'ect of our invention is to prolo vide' a simpli ed form of reactance thatmay beeasily'*r adjusted to suit a widerange of requirements.

y AIt is also an object of ourinv'ention to provide 'a simple andv easily adjusted*r reactor 15 that maybe usedv in conjunction with a transformer for increasngthe reactance'of the transformer circuit. v i

A further object of our invention is' to rovide means for accomplishing theparal-v ,A 20 elA operationv of two or moretransformers whose impedances are dissimilarwithout the necessity windings.`

" In the accompanying drawings,`

` Fi re 1 is a'face view of areactorembodymg our invention. y y

' Fig. 2 is an edge view thereof. ,c jFig. 3 is ar diagrammatic view of circuits and apparatus` showing our reactor applied to a bank oftransformers of unequal vimpedances. e j Fig. ris a view'showin parallelfconuected transformers that are ba anced by means of our'reactors. Referringparticularly to Figs. land 2`, our invention comprises, in general, a. reactor or balancing coilthat is made up of a lurality of stamped laminations 1 clamped )etween end frames 2 by" bolts 3 permitting an 'increase or decreasein the number of laminations 1 and havin a straight .bushing j 4 extending longitudina y into the central kportions of the laminations and end frames. The bushing 4 is preferably'formed with either one or two openings 5, although any desired number of o nl may beemployed as the'opening for t e bus ing- '4 throughv the end frames 2 and the laminations 1 may be of any desired size. The laminations 1 may 50 be rovided. with one or more air aps 6,

if esired, one onlykb'eingshown. y e disposition of the air-gaps 6 has atgrononnced e'ect u n the noisiness of e reactor. `When e'structure is-employed as a reof any change inthe transformer actor, thefair ga 6 is m'adeuse of, but when employedfas 'a alancingcoil, it is preferable to omit theuse ofan air gap. yThe reactor is energized by the" electrical conductor orconductors extending through the c 'opening 4or .openingsin -thebushing 4.

y vide-a reactor that shall be free tfrom coil n i f "of the transformers? andSare connectedfm kparallel circuit/and their secondary windings 9 and 11" are similarly connected in parallel rcircuit andare provided, at their ends, with Referring toy Fig; 3, the lprimary `windinfrs double leads 12. The transformer Thais a ylower impedance than the transformer' 8` and, accordingly,a reactor is'placed about the leads of thev transformer 7 in order to etiectively increase the impedance of that transformenvas compared-to the impedance 'of transformer 8, and thereby equalize the current supplied by the two transformers.-

f Referring to Fig. 4, we have'shown the reactor employed asa balancing v"coil to equalize the current* delivered by parallelvconnected secondary windings 13 and 14 of transformer bank. `Inthis application ofv our invention, one of the conductors from the winding 14 is'threaded through an opening 5 so that the currentfwill traverse the reactor in one direction and a conductor from the winding-"13 passes through another opening 5 in the reactor soy that its current" will traverse the reactor in a direction opposite tothat of the winding r14. `f The two conductors lare then lccmnected at a point exteriorly of y the reactor. f 'Under' normal loperating condition of a balanced load between the'windings 13 and l14, the' impedance offered by the reactor to the currents from both windings is the same. However, should either of the windings 13 or 14 tend to deliver more current than the other winding,-

vtheV impedanceof the` reactor to that current increases, thereb causing that current to' decrease and,'at e samel time, causing the other windlng to increase the current delivered by it. In this construction, the currents` de ivered by thewindings `13 and 14 magnetically inuence 'each other through 'the reactor to maintain equalvalues.'vr In other words, the reactor acts as an equalizer.

It will seeny that we have devised 'a simple and easily adjusted reactor whose reactance may be increased-ordecreasedto suit the requirements of the apparatus with which it is used.

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ductors constituting portions of electrical circuits in said passageWa-ys whereby the current traversing one of the conductors influences the value of the current traversing the other conductoror conductors.

2. In an electrical reactor, a plurality of laininations, end frames therefor, means for clamping the end frames to the laminations, insulating means extending longitudinally ot the reactor and a winding for the reactor comprising conductors within the insulating means and in mutual inductive relation.

3. In an electrical reactor, a plurality of laminations, end frames therefor, means for clamping the end frames to the laminations, a straight bushing having a plurality of passageways extending longitudinally of.

the reactor and windings for the reactor comprising conductors within thebushing whereby the currents traversing the several conductors influence the value of one another. Y y

4. In a device for addin reactance to a single conductor system, a ushing for the reception of a conductor of said system, a

, plurality of end frames for supporting the ushing, adjustable clamping means for the end frames and a plurality of laminasl surrounding the bushing and confined between the end frames, each of the laminations being provided with an air-gap extending in a radial direction to the bushing and in predetermined angular relation to the air-gaps ot' adjacent laminae.

5. In a reactor, the combination with a current-carrying conductor, of a group of separable magnetizab'le-members ot a magnetic circuit inductively related with said conductor, theilux induced in said magnetizable members reacting solely on said conductors, and means for maintainingr said magnetizable members in assembled rezlation, said means comprising a detachable structure whereby the number of magnetizable members associated therewith may be varied inaccordance with the magnitude of the reactance to be added to the circuit in which said conductor is included.

6. In a reactor, the combination with a current-carrying conductor, of a oup of separable magnetizable members ora magnetic circuit inductively related with said conductor, said magnetizable members functioning solely to increase the number of lines of force around said conductor, and a frame for said magnetizable members, said frame comprisin detachable members whereb the number o magnetizable members associated therewith may be varied in accordance with the magnitude of the reactance to be added to the circuit in which said conductor is included. s 4

7. In a' reactor, the combination with a current-carrying conductor, of a group of separable magnetizable members of a maff- `netic circuit-inductively related with said conductor, said magnetizable members functioning solely to increase the number of lines of forcearound said conductor, a frame comprising end plates for said maofnetizable members, and a plurality of detachable elements for maintaining said end plates and niagnetizable members in assembled relation whereby the number of magnetizable members may be varied in accordance with the magnitude of the reactance to be added t0 the circuit in which said conductor is ineluded.

8. In a device for adding reactance to a single conductor system, the-combination with a current-carrying conductor of said system, of a group of ma etizable members of a magnetic circuit inductivel related with said conductor, said group o magnetizable members functioning solely to increase the number of lines of force around said conductor and comprisin an air gap impeding saturation thereo and means for maintaining said magnetizable members in assembled relation.

9. In a reactor, the combination with a' current-carrying conductor, of a group of separable magnetizable members of a magnetic circuit inductively related with said conductor, said magnetizable members functioning solely to increase the number of lines of force around said conductor and comprising aligned air gaps impeding saturation thereof, anda frame for said ma netizable members, said frame comprising detachable members whereby the number of magnetizable members associated therewith ma be varied in accordance with the magnitu e of the reactance to be added to the circuit in which said conductor is included.

In testimony whereof, we have hereunto subscribed our names this 4th day of May, 1925.

JOSEPH S. HEBREW.

EDWARD E. ROSS.

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