Совершенствование функции "ресинхронизация" синхронных двигателей в цифровых реле Sepam 2000

Abstract

Рассмотрены вопросы повышения надежности самозапуска синхронных двигателей с гашением поля, осуществляемым функцией ресинхронизации, запрограммированной в цифровых реле Зерат 2000 фирмы «Шнейдер Электрик».

The article is concerned of reliability of re-powering high voltage synchronous motors by the Sepam 2000 function with prior rotor field discharge. The fact revelations the power loss of synchronous motor according to the motor, according to the synchronization algorithm is determined by reducing of voltage and active power reverse on synchronous motor. But the exploitation experience of such a relay in «Gomeltransoil» plant shows if load consist of asynchronous and synchronous motors the failure of resynchronization function is often occurs. The experimental research and modeling of transient processes shows that reasons of the failures was a measurement element of active power backspacing due to the oscillatory process of active power flow between asynchronous and synchronous motor. There are two variants of the perfection of re-powering function. One of the variant is to change proposed characteristic of operation, the other one is to change the logical part of relay with addition of return delay element.