US698650A - Electric meter. - Google Patents

Description

No. 698,650. Patented Apr. 29, |902.

T. DUNCAN.

ELECTRIC METER.

(Application fixed Aug. 3:1899.) (No Model.) 2 Sheets-Sheet I.

'-N. 693,65. I Patented Apr.- 29, |902.

" A T.,nuNcAN.

ELECTRIC METER.

(Application led Aug'. 3, 1899.)

(No Model.)

2 Sheets-$heet 2.

flag. 3.' 3565@ if UNITED 'STATES PATENT omet. N

` 'rnoMAs DUNCAN, oncnIcAco, ILLINOIS, AssIGNoR To Tur; sinM'ENs a HALSKE ELECTRIC COMPANY OF AMERICA, OF CHICAGO, ILLINOIS, A

CORPORATION OF ILLINOIS;

" Y ELECTRIC" METER.

SPECIFICATION fomingpat gf Leners recent Nq. ee 8,650, .mais` Aprn 2e, leoa. j u Appiicaiogfuea August3.1899'..-serinrmzaeva (Nomaden Y l A.

Be it known that I, THOMAS"DUNCAbLof,`

Chicago, in the county of Cook` and State of Illinois, have invented certainnew and useful Improvements in Electric Meters, (Case NmV 53,) of which the following is aspecificatiomf vtive forcewhich it represents.

The invention `consists in the matters hereinafter described, and particularly pointed out in the appendedclaims, and will befully understood from the following detailed description of the constructions illustrated in the accompanying drawings, in which- Figures l and 2 are partially diagrammatic plan views of meters embodying my invention. Fig. 3 is a similar front elevation of still another meter Vconstruction embodying my invention, but modified somewhat from either form previously shown. Figs. 4, 5, and 6 are vector diagrams of the essential current eects.

As shown in Fig. l, A designates the rotary armature of the meter, B and C the series and volt field-coils, and D an impedancecoil connected in series with the volt fieldcoil C in a shunt-circuit between the main leads w and w of the work-circuit. D' is a secondary impedance-coil placed in inductive relation to the coil D and connected in a second shunt-circuit, in which the volt field-coil C is also connected in series. The terminals d and d of the two coils D and D are shown as connected to the leads w and w, respectively, of the Work-circuit, while their opposite terminals d2 and d3 are connected,through theyolt eld-coil C, with the leads fw' and w, respectively. Adjustable resistances r and r' are shown as inserted in the terminals d' and d3 to assist in the adjustment and calibration of the meter, and as a further improvement a starting-coil D2 is shown as inserted in the secondary shunt-circuit between the coils C and D to assist in overcoming the friction and inertia of the meter, especially under light working loads. The construction` shown in `2 is similar, except that the secondary coil D, instead of being Wound upon the same magnetic core D3 with the p`ri` marycoil D, is wound upona separable armature D4, `which for purposes of "fu rther a'djustment maybe Separatedfrom the main `core D3 by space blocks s n,ofauy desired thickness. This is also true of the construction shown in Fig. An additional adjustable resistance r2 is also shown in Fig. as inserted in `the terminal d2 ot `the primary shunt-circuit, while in Fig. 3 only the single adjustable resistance o" in the terminal d3 of Vthe secondary shuntfcircuit is provided. The

friction-coil D2 is not shown in Fig. 3, but can be supplied in any suitable manner. In all of said views, G indicates the alternatingcurrent generator, andL and M the lamps and motors constituting the load.

Any suitable mechanism R may beeinployed to register the revolutions of the ar mature, and a magnetic drag Smay be applied in the usual manner to maintain the number of revolutions proportional to the torque exerted, such devices being indicated in Fig. 3,'but omitted from theother views of the drawings for the sake `ot simplicity of illustration. These features', however, constitute in themselves no part of the present improvements and are mentionedmerely for the purpose of enabling the complete installation to be clearly understood.

The essential phase relations resulting in the present improvement are shown graphically in Figs. 4, v5, and 6, in which the line E represents the impressed electromotive force ot the work-circuit, and F the primary shunt-current, which will naturally be lagged somewhat less than ninety degrees behind the electromotive force E by the impedancecoil D, Fig.4. The secondary impedance-coil D will act as a primary on the coil I) and induces a secondary current F in the primary shunt-circuit, so that the total eective current through this circuit is the resultant f, obtained by completing the parallelogra'mon lines F and F', Fig. 5. This maystill lag less than ninety degrees; but" the total current supplied to the volt field-coil C includes not only such resultant, but the secondary shunt IOS 'tion-circuit.

current F2 through the coil D7, the et'tect of whichis to produce a iinal resultant F3, which Y by suitable adjustment, as by means ot' eitherv or all of the adjustable resistances fr, r', 'and r2, may be given the exact ninety-degree lag desired.- "4

AIn the preferred embodiment ot' the invention, as illustrated, the pressure-winding is subdivided into two coils, the coils having a common terminal, which is connected with one side ot the distribution-circuit through' an impedance-coil, the remaining terminal of one of the remaining pressure-coils being connected with the other side of the distribution-circuit through a second im pedance-coil,"

'the impedance-coils being preferablyinductively related, while the remaining terminal of thel remaining.pressure-coil isalso connected with the latter Lside of the distribu- I claim as my invention- 1. An electric meter provided with an armature, a series coil connected in series in the work-circuit, a volt-coil connected in two shnnt-circuits between the main leads of the work-circuit, and impedance-coils inserted in each of said shunt-circuits, substantially as described.

2. An electric meter provided with an armature, a series field-coil connected in series -in the Work-circuit, a volt field-coil connected in two shunt-circuits betweenv the main leads of theworlc-circuit, and impedancecoils inserted in each of said shunt-circuits `and arranged in inductive relation to each other, substantially as described.

3. An electric meter provided with an armature, a series field-coil connected in series in the work-circuit, a volt field-coil connected in two shunt-circuits between the main lead of the work-circuit, impedance-coils inserted in each of said shunt-circuits, and a nal of the remaining pressunefcoil isalso connected with thelatter side of the distributioncircuit, substantially as described.

5. In a meter, the combination with current and'pressu're windings, the pressure-windings being subdivided into two coils having a com- 'mon terminal, an impedance-coil connecting the said common terminal ywith oner side of a distribntionfcircuit, a second impedance-coil kconnecting the remaining terminal of a pressure-coil with the other side ot' the distribution-circuit while the remaining terminal ot' the remaining pressure-coil is also connected with the latter side of the distribution-circuit, and'a Vphase-modifying device r connected in shunt ofthe distribution-mains,sub stantially as described.

7. In a meter, the combination with current and pressure windings, the pressure-windings being subdivided into two coils having a common terminal, an impedance-coil connecting the said common terminal with one side of a distribution-circuit, a second impedance-coil connecting the remaining terminal of a pressure-coil with the other `side of the distribution-circuit while the remaining terminal of the remaining pressure-coil is also connected with Athe latter side of the distribution-circuit, the impedance-coils being inductively related, and a phase-modifying device r' connectedin shunt of the distributionmains,sub stantially as described.

In testimony that I claim the foregoing as my invention I affix my signature, in presence of two subscribing witnesses, this 25th day of July, A. D. 1899.

THOMAS DUNCAN. W'itnesses:

ALBERT H. GRAVES, HENRY W. CARTER.

IOO

Images