SU4618A1 - Volt-Ampere or Volt-Ampere-Hour AC Meter Measuring Instrument - Google Patents

Description

The proposed device is basically an ordinary meter or wattmeter, in which, however, one of the systems is volt or ampere, it creates a magnetic flux that always coincides in phase, or differs in phase from the current of the other system. This result is achieved by using the first system to create a rotating magnetic field, which, when placed in the magnetic flux of the second system, itself creates the required sinusoidal magnetic flux in a certain spatial direction, provided that the rotating field can freely be established spatially in the magnetic flux of the second system. In the proposed device, npninaioiucecH mlnipus iiciju (m.chdaogsche ciiCTC.Mofi and molopy K.iiyiiicK, С1н) () ol, 11о co1; rc1, oscillations around the axis of rotation of the magnetic field. This system is oriented in the magnetic flux of the ampere rollers as a mobile phase meter system. The magnetic action of such a system in a certain spatial direction, passing through the axis of a rotating magnetic field, is similar to the action of a sinusoidal flow with a frequency equal to the rotational frequency

a magnetic field, the magnitude of the magnetic field proportional to the force, and out of phase of the current from the ampere magnetic flux by the angle between the flow and the direction taken. To obtain a rotating magnetic field, it is also possible to use an ampere signal oriented in the volt current.

FIG. 1, 2 and 3 depict a device for measuring volt-amperes and in FIG. 4- corresponding scheme. FIG. 5, 6, 7 and 8 (section along NN of Fig. 5 and b) shows a device for measuring voltamperes and FIG. 9-appropriate scheme. FIG. 10, P and 12 (NN section of Fig. 10 and 11) shows a modification of the designated instrument for measuring pol.zhper, il |) game, 13-correspondent: 11 (ui 1c; gi cxcM.i and HI fig. 14 di, 1rpOMMi.

A device for measuring three-phase current-voltage hours (Figs. 1-4) is a normal single-phase induction-type watt power meter with an W-shaped magnetic core and a rotating disk (a permanent magnet and small adjustment tools are omitted in the diagram to simplify the drawing). Unlike an ordinary counter, the serial magnetic flux in the core is G-7b; it is not entirely through a rotating disk, but it is shunted through an iron cylinder /; the latter carries a three-phase winding, which creates a rotating magnetic field around it, which makes one full revolution of the cylinder in the continuation of one period of the supply current. The cylinder through the axis lies in the bearings like a motor rotor. On this axis, the cylinder can turn at any angle and is installed in any spatial position. To the winding of the cylinder e, e. . e. . the current is supplied by flexible thin wires ((1) and 4). When the magnetic flux is detected, the cylinder is adhered so that a sinusoidal magnetic flux, always out of phase from the serial flux f-90 (phase meter principle), is created in the direction of /, perpendicular to the shunt branch of the branch /, by rotating the magnetic field. . Thus, the disk intersects in two places with an amperage magnetic flux and in one (in the middle between the intersection points of the flow L) by the flow F.2, which is closed through the instrument case and out of phase with respect to the flow F by 90 .. This shift is constant and independent on the phase difference between the current in the ampere windings / and the voltage of the current supplying the windings of the cylinder /. The torque that drives the disc is then

M - KR G ,. sin 90 ° (where / s is the proportionality coefficient), i.e. always maximum when given FI and P. Including the device ampere winding into one of the three-phase current phases and the cylinder winding / into the same network into all three phases in parallel (figure 4), the flux F is proportional to the current strength / and flux P, ; is proportional in magnitude to the voltage of the network E. Then the torque 1 / sin is 90 °, i.e. independent of the phase shift in the network. With the appropriate selection of a constant device, its mechanism will be counted},: it will be T-amps-hour ;. The device shown in ng. fi; 1-4, GODS11.l work in the network of threefnz; south current with a uniform load fg.z. On the same principle, the following devices can be performed: 1) for three-phase current with non-abnormal load: 1st phase, 2) single-phase tokz and generally multiphase currents.

FIG. Fig. 9-12 shows the form.: 1 implementation of the proposed device;) for measuring the single-volt-ampere, - ;: current with an iron magnetic circuit. It consists of two intersecting one of the closing sides of the yellow cores /, and / ,. At the intersection, the cores are high with such c) 6 |:) asex, that they are covered with four HCiioniin / i-: iio reinforced on o (.. and zhb: l (V-.11 .i cylinder / ,. the gap between the cylinder / i and the magnetic cores F and /,. can rotate freely on the cylinder’s two-phase axle system of two frames,, and C. Also,

the magnetic core P is put on the ampern. Both frames e and cj. nm.i are artificially produced by a two-phase current using induction resistance L and ohmic g and form a rotating magnetic field around the cylinder / 1. Having the ability to be installed in the ampere flow of the coil / frame (rotated-1 magnetic field), it is formed in a perpendicular magnetic conductor P the magnetic conductor sinusoidal magnetic flux. The flow is always shifted in phase by 90 and relative to the current in the amp coil. The magnetic core / o has a cylindrical cutout, filled inside with an iron cylinder / 2, reinforced on both sides with special copper plates on the iron of the magnetic circuit / V In the gap between the cylinder / 2 and the magnetic core P-2 on a special axis, which lies freely in the podshpnik, the current-setting frame / It is installed by two coils and springs, which at the same time serve as conductors for current supply. If, as shown in

the circuit of FIG. 9, turn off the coil in od11os | kziu1O network in series, Kspushki Cj and g ,, in parallel through

the corresponding additional resistances and a p / w, parallel connected in series into a shunt resistance, for example, a coil /, the magnetic flux /, proportional in magnitude to voltage AND of the network and shifted in phase relative to the current of the network at a fixed angle 90, interacting with current in frame i, deflect it to one side or the other by an angle a - to i n cos (90 I), where k is the proportionality coefficient, / is the current in the frame of the same designation, n is the number of turns in it and the shear angle in the shunt branch of the frame points / relative to the current phase in the network, i.e.

 P, /, -cos (90 × -.). The angle J for this instrument is constant. By selecting a shunt or additional resistance to the frame / it can be brought to the most advantageous value of 90 °; then the angle of deflection of the frame, and consequently, the arrow attached to it, will be equal to / fj EI / ,; However, this selection of the angle J is by no means obscured, since it suffices that ISfO.

The device can also be designed, for example, as follows: 1) the exciter of a rotating magnetic field can be designed as a rotor of a motor (with a rotating magnetic core, as in Fig. 1-3), 2) it can be not two, but multiphase, ) the phase shift in its windings can be carried out using more complex and precise schemes; 4) the dubious convenience of using shunttops with alternating current (frame /) can be avoided by introducing a special current transformer whose role can be played by a fixed thin winding placed on core / ,; the voltage induced in it by the flux FI is proportional to the strength of the current in the network and is shifted in phase by a constant angle (approximately 180 °).

Modification of the instrument; s for measuring the aeltamps consists in a tone (fkg. 10 -14), which instead of the SIZE of the system /., On the core /% on /. The winding is burned. Thus, the current induced in the winding can be used outside the device.

The subject of the patent.

1. An instrument for measuring voltamperes or volt-amps in an AC network, characterized in that the shunt winding is made of two or multiphase to obtain a rotating

flow on the rotary iron cylinder located in the branch of the flow created by the operating current, the flow of which cylinder is perpendicular to its orienting branch, acts on the moving 1-meter metric system or counter system together with the flow created by the operating current.

2. The form of the device described in claim 1 for measuring volt-ampere-hours, characterized in that the rotary iron cylinder / with the winding superimposed on it is located in a space which is formed by parts of the cut middle core of the W-shaped magnetic system of the counter and the branches two extreme cores of the same system (Fig. 1-4) located perpendicular to the middle core.

3. The execution form is characterized by ioro in l. 1 pick-up unit for measuring voltamperes, characterized in that a freely rotating iron cylinder / with a winding superimposed on it to receive a rotating flow is placed in a common cylindrical cut-out of two crossed, perpendicular to each other iron cores P, F-, of which the cores of the core P are supplied with a series winding, the other core / Vj is provided with another cut, in which