US1136810A - Device for the comparison of current, tension, and power by self-acting resistances. - Google Patents

Description

M. KALLMANN, DECD.

. P. KALLMANN. ADMINISTRATRIX.

DEVIQE ron THE commmson or cummn, TENSION, AND POWER BYSELF ACTING RESISTANCES.

APPLICATION FILED lULY 12, 1909.

- Patented Apr. 20, 1915.

v i T g g. @wfi Ti 5. Z.

fiifies'sea- THE NORRIS PETERS 60.. PHOTo-LlTHO.. WASHINGTON. D. c.

lJMAlRTIN,KALLMANNQ OF' BERIIIN, GERMANYpPAULA KALLMANN, as 3123mm} r GERMANY, ADMInIsTRA RIx on, SAID MARTIN KALLMANN, DECEASED. 1

E CE R ETHECQ AR 1*!- U R E IO AN r ummits I To azzwhomam m,

'stantially constantcurrent, for'use intestv especially to Fig, 1,5Biindicatesithe'entiref group of, load resistances, 1 such group being sonof Current, Tension, and'iPower 'by' Self- Acting Resistances, of which the following is a specification.

This invention relates tofmeans for test- 7 ing electricmeters, and-it consists in the use "of resistances of known'value having a high positive temperature coeflicient, connected 5, t with one or both ofxthefcoils of the-meter and constituting an automatically" regulated,

load resistance designed to maintain a subing without -a, standard*meter.

' In the accompanying d rawings forming part of this application, Figure :1 is a diagrammatic yiew' of the device, showing the" v manner of connecting the 'Various resistances "Figs; 2 and are'similarfviews showing the'connections with the mainand -l shunt coils of the meter; under the condi-Q tions described 'belowi i Referring to the drawings in detail, and

composed of a number, ofindividual ele-, ments consisting of iron conductors m ore- .ceptacles filled.- with'hydrogen; 'Ihe resistance elements Vareconnected inthe man 'ner shown in Fig;1,'inwhich' two conduc-v tors '5and 10 have connection with agnum ber of resistances, which arealsoconnected with contact members 'l5, arranged in pairs;

' sothatthefmembers of any two" pairs (01' all of them), may be connected by, switches pivoted. atthe points 20., These switches are connected by a wire25. The first group. i

of resistances at the right comprisestwo variable resistancesconnected in series "with 'gwlre 5,'and two connected in series wlth wire 10, all four being arrangedfforconnection in series with eachj'other by means of switch a. The switch a? is arranged to con- I meet two Variable'frsistances'whichelare inparallel with eachotherand have connec j tion with wire 5, in such manner that they will be '{in series with two resistances (also i parallel with 2 each; other) which; have t connection j with wire- 10. Switch 030011; 'nects series two .variableiresistances cone a "nected resp I Be it'known that I, MARTIN KALLMANm] electrical enginenfoitizenofGermany, re-' sidingiat Kurfuerstend'ammj /41, Berlin, I

cQ HQcted to be cutout in: steps.

RESISTANCES.

switch a* -controls resistances connected like those controlled by" switch dfl'while switch' V a controlsvreslstancesarranged similarly to those connected by: switch. a l A' :variable reslstancev. "is connected" with "a resistance cti ely" with wires 5 than, and;

, t R of substantially constant resistance-ma ts fi i fie ne mattedApafsafmia;

'i 'r alr Such s Rj, .comprisin j two j a a sectmns W and W the'fi'rst of, which is ad it justable'; ,Resista'nce V iscon'nected with ,651 nected, and resistance Rv may -be}conneote I 1 .t

terminal 30, with "which wire' 5 is also conwith terminal (1;

The manner of using diagrammatically in Fig. 2; i The shunt coil I this "arrangement" Q15 when ,testmga wattshour meter *isshow nij, V I ;:.70 N of the meterfl-is connected WIth terminal; I

X, andthe main coil is"connected'with 1 1 v terminal 30, the iouter conductors f of a three wire system being connected, grespectively,

with the main coil and with terminal d;

:L'indicate's the installationto whichlcur-f V rent is'being supplied by the-leads;

' The-switchesa, a 02 a? and a permit 1. i I: the resistance elements with which they are I ,For the:.purpose-of maintaining constant.

a; potentialof '220 volts afl 'ecting the outer" T ,conductors, cl'isiconnected to the negative terminal and bf is disconnected. 'Switchc T V 1;

85,. are'then placedxinseries-between theouter 1' conductors. Thestrengthofthe current is" Q generally one-half anampereytherebeing 20 oltsat V and 200 volts at-the constant; resistance; Across the latter '(V? and 'R), and vbetween. the terminal X andgthe negw, 1 tive 'connection'd,'the shunt coil N offthe "wattfihour meter is connected, andis' 'at'a -constantvoltage of 200. The va'riators ata 1 potential of 210 0111 require'lO volts. On a volt circuit the switchc is closed, can-g nectingthe' outer conductors Sand 10. ?:The i negative main is disconnected ,fm'm' the Y outer; conductor 10 at dand is connected 1 with the middle conductori25 at b.v The is "open. The resistances:V QWEand VV shunt coil N of the meter is influenced by 7 As many jofgthe groups ofyariable rsish; an'ces arei'connected up by switches-0,11 5

; rangement over previous ;constructions, is;

etc., as maybe necessary,the current passing through the main coil of the meter;

through wire 5, the switchesjust mentioned, Wire 10, to the. other lead, and the shunt circuit being completed through resistances W, W as in Fig. l or through resistance -V as in Fig. 2. The current Will be maintained constant Within limits by the iron resistances, sincetheir' ohmic yalueincreases with the increaseof voltage. V The value of the resistances being known, the meter may bettesteol; without a standard meter, Q'Ehe degree I of incandescense of 1 an iron resistance shows when it is .penformingits normal function.

V The advantage of-the abovedescrihed arthat it vis not only possibleptortest amperhour meters and wattehourmeters .vvithout lowering .the voltage of -the v-shunt circuit in the first ocase, but .the regulating control of the largevariable .-resistances;V is greater iron resistances, that is, the thinner 'the Wires and the, current =constant Within wider limits. Moreover, the construction greatly simplified and no adjustment 'isrequired, the same load resistance being used for voltages between 210 and 230.

. The more delicate the construction-of the used, the more sensitive I do they become, as they immediately resp ndkto the variations of potential, becoming heated to a high degree, and checking the initial; rush ofcurrent. The efiiciency i of :the test is increased in proportion to the sensitiveness of the resistances controlling the current, a

'What Iclaim is: 1. @Ina device oiithecharacterdescribed, a plurality of outer conductors having iterminaleconnection's; a third and "normally neutral conductor between the conductors first mentioned; a meter having its :main coilvconnected with one of theouter conductors; a plurality of load aresistances -.of

high temperature coe'fficient arranged: to \be a connected iacr'oss -the outer .conductorsvand with the (main coil, said resistances also be- Copiesuof this patentmay lie-obtained for shunt coil o1": the-meter, thelatter coil having ing arranged for connection with saidthird conductor; a supplementary resistance of high temperature coefficient-connected with one of =the outer conductors and with the shunt coil of the meter, the latter coil having connectionw'ithcthe'other of'said outer con ductors; independent means arranged to connect the outer conductors; means ior connecting the third and normallyneutral conductor Withthe supplementary resistance and the negative terminal; and means for disconnecting one ofrthe it outer conductors from. said negativezterminal. i In fludGVlCG'Ofl the character described,

a plurality of outer; 1 conductors Ehaving terse minal connections; third; and :normally neutral conductor between the conductors 7' first mentiionedi; a imeter havingwits main coil] connected with one of the louterr conductors; a plurality of load, resistances of:

high temperature eoefiicientn-arranged ;to be connected across the outer conductors and r ing aarrjanged forrconnection with; said third conductor; -a. supplementary resistance of high temperature 1 coefiicient connected with one of the outer conductors and'with the.

connection With the other of saidouter' rcon resistance material in series, withi thepsupplementary Presistanceof high temperature coefficient independent .means arranged to connect the outer conductorsymeans for connecting the ,thirdand normally neutral 'ductors; anadjustable.resistanceof constant conductor-'withthe supplementary resistance a and the negative terminal' gand ;means for disconnecting one of the outer conductors from said-negative 139111111131. W '7 In testimony whereof. I have signed my name to this specification in thepresence of two subscribing Witnesses. o p: v V

V V MARTI KALL vIANN.

V'Vitne sses: Q HENRY HASBER, WOLDEMAR Henr five cents each, by addressingthe Commissioner of Patents, Washingt mDXQiPz V

Images