SU95648A1 - Device for compensating frictional moment in single-phase induction meters - Google Patents

Description

The subject of the invention is a device for compensating the moment of a trill in single-phase induction meters, having two magnetol ovods, and it is directly in the loss counters that do not have voltage coils.

The compensating moment in the device is created by the omnipotent windings located 1 on the magnetic conductors of the meter and powered by trims of triple frequency currents shifted one turn away; 1b the second by a quarter of the period of these currents.

As the source of the triple frequency current in the proposed device-ve pr: name.} 1b; three single-phase drossel, connected by IB Sound to the wire, in which the third harmonic current flows.

Sdv.ng (time between toyaml two com :: en; the loop windings are provided by a capacitor and an om.ic CO resistance, which are connected in series to one of the compensating windings.

To prevent the possibility of induced, and .h the currents of the fundamental frequency in a closed circuit, formed parallel to the connected windings and co-mimizing MN windings, and this circuit introduces a filter consisting of parallel to the connection of the currents through the HHix capacitance to the inductance and current. about frequency.

The drawing shows the principle of the proposed device.

Here /, 2 and 3-three oai-nakovyh-saturated single-phase choke switches; 4-way current with multiB-igxay Btor.ichnaya winding; 5 and f-kytu-shk. nats zhsNi L current coil of the meter; 7 and S-auxiliary windings through which the third harmonic current flows; 9-bone, compensating self-induction of the winding 8 at Lroy th frequency; 10-dobachense ohmic resistance; P and 12-capacitance. And -i.industrial, forming a filter, 1e .g; 0speeing current of the main frequency; for the currents of the third harmonic, the power of this filgrar is not very well-guided.

The presence in the device of a three-meter, and -1515.d. throttle and filter increases the stability of the momentum and increases

this is the accuracy of the counter.

Subject invention

Claims (4)

1. A device for compensating the frictional moment in single-phase induction meters having two magnetic cores, mainly in loss meters that do not have a voltage coil, characterized in that it consists of two located 3iKaea.HHbix Malnitprovods counter auxiliary voltages fed by alternating currents of triple frequency shifted from one another by a quarter of the 3T period, Hix TOKOiB, and serving to create a compensating moment in the counter. 2. In the device according to claim. 1, use as a current source the triple frequency of three single-phase chokes, connected in a star with a zero wire, in which the third harmonic current flows. 3. In the device of claim 1, use of a capacitor and an ohmic resistance, connected in series to the circuit of one of the compensating windings and providing a phase shift between the currents of the two compensating windings. 4. In the device according to claim 1, use an electric filter consisting of parallel-connected capacitance and INDUCTANCE: subsequently connected into a closed loop of two parallel-connected compensating windings, and preventing oscillation currents from pointing in this circuit.