RU1804690C - Method of starting system: synchronous motor-generator - Google Patents

Abstract

Use in testing and operating magnetoelectric motors. Essence: during the start-up of the synchronous motor-generator system, the predetermined excitation current of the generator is established from the condition that the generator voltage is equal to twice the rated voltage of the synchronous motor. In the process of regulating the excitation current of the generator, its value is reduced until the synchronous motor reaches the rated speed, and the current value in the main circuit is maintained at the level of the nominal value.

Description

The invention relates to electrical engineering and can be used in the operation and testing of synchronous electric motors, mainly magnetoelectric.

The aim of the invention is to simplify and increase the reliability of the starting method.

An example of a specific application of this starting method is the launch during testing of the DMK-10 synchronous magnetoelectric motor. The test setup includes a power generating unit containing a synchronous generator and a drive motor, and a DMK-10 test engine. In tests, the excitation currents of the generator, cor. generator and engine; and the frequency of the generator current.

Before turning on the installation, the generator excitation current is set from the condition that the generator voltage is equal

twice the rated voltage of the synchronous motor, in this case 240 V. Then it connects the main circuit of the synchronous motor to the main circuit of the generator. The frequency of the generator voltage gradually increases from zero to the nominal value, for example, during the start-up of the power motor. The speed of the starting engine also increases simultaneously. During the start-up process, the excitation current of the generator is reduced, maintaining the current in the main circuit of the synchronous motor at a nominal level equal to 74 A. In this case, the excitation current of the generator is controlled until the synchronous motor reaches its rated speed, i.e. until the launch is complete.

The technical and economic effectiveness of the proposed start-up method is that: ...

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a) during start-up, only the excitation current of the generator is set and regulated, which simplifies the start-up method;

b) it is possible to start magnetoelectric motors without a special starting cell on the rotor and without a special starting motor.

Claims (1)

SUMMARY OF THE INVENTION A method for starting a synchronous engine-generator system, in which a predetermined excitation current of the generator is set, the main circuit of the synchronous motor is connected to the main circuit of the generator, and the excitation current is regulated 0 5 generator and increase the frequency of the voltage of the generator from zero to a nominal value, characterized in that, in order to simplify and increase reliability, the set excitation current of the generator is set from the condition that the generator voltage is equal to twice the rated voltage of the synchronous motor, while regulating the excitation current of the generator is reduced its value until the synchronous motor reaches its rated speed, while maintaining the amount of current in the main circuit of the synchronous motor is of its nominal value.