SU89500A1 - Device for driving synchronous machines - Google Patents

Description

The devices for woubdegde and synchronized machines with compounding by feeding the circuit of the excited day of the current of the current transformer connected to the machine's stator circuit are known.

In such ycTpoMcTj3ax, the normal voltage on the orders of a synchronous generator at idle is provided by self-excitation (or independent excitation).

This self-excitation of oscillators and the peculiarities of setting the rounding up limit the value of the compounding coefficient; the reduction is compounded, and the generator self-excitation to increase the indicated coefficient is undesirable due to the operating conditions of the generator at low loads.

The proposed device for driving synchronous machines provides an increase in the compounding ratio as the generator load increases using forced compounding. Two included in one phase are applied to supply the make-up current.

current transformer, connected on the secondary side}} e differentially II impedance magnetic cores, location: OSH 1k of individual current load currents.

The drawing shows the electrical circuit of the proposed device.

Compounding of the generator / is carried out from two current transformers, including, 11 and opposite, one to another. These transformer; served on (Fire Department with:; 55y; kden; And war / ditel 4 through transformer 5 and rectifier mkteli 6 made up yp; th voltage, proportional to the load current of generator 1.

The current transformers 2 and 3 are made so that one of them has a magnetic core that is significantly slower than the other. Prior to the beginning of the magnetic saturation of the first current transformer, the compounding current, and hence the compounding coefficient, will be unknown; then they will increase rapidly, and in the region of the generator rated load, the desired high compounding ratio can be obtained.

The described scheme has a pronounced nonlinearity of the compounding characteristic and its action is not associated with an increase in the electromagnetic inertia of the compound compaction. Object of the Invention A device for excitation of synchronous machines with compounding by feeding the excitation circuit with a rectified current transformer included in the machine stator circuit, characterized in that, in order to force the compounding, two current transformers connected in one phase, are applied. differentially connected on the secondary side and having magnetic cores that are pasacomous at different load currents.