SU143107A1 - Device for distributing loads between generators operating in parallel - Google Patents

Description

The prior art devices for distributing loads between generators operating in parallel do not ensure a sufficiently uniform distribution of these loads between said generators.

The proposed device, which provides automatic switching on of generators, connected between themselves by two symmetrical equalizing circuits and excited by individual exciters, eliminates this drawback. To automatically equalize the load between the generators, the auxiliary excitation windings of the pathogens are included in the equalization circuits so that the equalizing currents flowing through them create additional magnetizing forces of the pathogens, in one of which the corresponding winding bias the generator while the other circuits demagnetize it.

The drawing shows a schematic diagram of parallel-connected generators with self-excitation through magnetic amplifiers with equalizing winding.

In order to evenly distribute the load on two generators / and 2 standard power, the following equalities must be observed:, i / 2 and, where: E and EZ emf. generators, rl and g are the resistances of the supply wires, gz and the resistance of the windings of the additional poles of the DP.

The device automatically creates a correspondence between the voltages of the connected and operating generators and ensures an even distribution of their load by turning on the windings of additional across, the ambulances of the DP generators, divided into two equal parts, according to the scheme

The Nb 143107 is an equilibrium bridge, from one diagonal of which the load of the generators is removed, and to another diagonal, consisting of two equalizing; 1 rosod, sub 104; auxiliary windings of exciters of parallel generators - / and 2.

If the load of both generators is the same, then with equal bridges of shoulders, the potential difference of the points to which the equalizing windings of the OS are connected, and the equalizing currents in them will be zero, and consequently, the magnetizing force of these windings will be absent.

Inequality e. DS generators, leads to inequality of loads between the generators and the inequality of potentials in the cars Ci and 2, b and c-2, as a result of which a current arises in the equalizing windings of the OS. Auxiliary excitation windings of the exciter are included so that the equalizing currents Gu and Gu flowing through them will create additional magnetizing forces of the pathogens, one of which will magnetize the less loaded generator, and the other demagnetize the more loaded generator. These currents will act until the load of the generators is again distributed equally.

The effectiveness of equalizing windings depends on their resistance, on the sensitivity of the exciter and on the resistance of the sections of the main circuit. Therefore, the proposed device is expediently used for DC generators, in which an excitation system consisting of a magnetic amplifier or a motor-driven amplifier or a combination of conventional machine-controlled agents with magnetic or electric machine amplifiers (drivers) is used as the exciter.

The present device achieves a uniform load distribution of parallelly operating generators with parallel and mixed excitation. In this case, the generator excitation winding is connected in series between the winding of the core and the winding of the additional DC poles in the QI, b, and a, c sections.

When switching on generators for parallel operation, located in different rooms, it is not necessary to match the generator voltages, as is required for parallel operation of generators with an equalizing wire. To do this, it is enough to turn on only two equalizing windings of pathogens, not including the power circuit of the connected generator. In this way, a closed loop is formed consisting of coil windings, consecutive field windings (for machines with mixed excitation) and equalizing windings along which the surge current will flow. In order to limit the magnitude of this current, an additional resistance must be introduced into the equalization circuit, which should later be felt.

In case of using the device for generators of different power, the place of connecting equalizing windings in the shoulders of the bridge should be selected from the ratio of equality of the product of current loads to the resistance of the bridge shoulders.

The equalizing action of the equalizing windings is maintained both in the generator mode and in the engine mode. When the motor is reversed, the balancing windings must be switched.

The proposal can be used in all power systems where parallel operation of generators or DC motors with excitation is foreseen, in which the excitation system has highly sensitive excitation elements (magnetic silica - MU, electric machine amplifier, etc.). Subject invention

A device for distributing loads between generators operating in parallel, for example, direct current machines interconnected by two symmetrical equalizing circuits and driven by individual drivers, for example magnetic amplifiers, characterized in that for the purpose of automatic load balancing between the generators, The pathogens are equipped with auxiliary windings included in the balancing value so that the balancing currents flowing through them create additional agnichivayuschie strength agents, one of which will PA1, less magnetization-reversing nagrul enny; for generators, and other demagnetize more loaded generator.

LH 143107

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