PROCEDURE TO CONNECT AN ASYNCHRONOUS GENERATOR ON AN ALTERNATING CURRENT AND AN ELECTRICAL CONNECTING FOR USE AT THIS PROCEDURE

The invention relates to a procedure of connecting a polyphased asynchronous generator on a polyphased alternating voltage network. The connecting is carried out by means of an adjustable, electronic connecting based on thyristors or similar variable (adjustable) connecting items, the connecting degree of which is varied during a controlled connecting course, which is controlled in consideration of the wish of a "soft" connecting on the network and a limitation of the maximum amperage during the connecting course. During the whole connecting course a continuous determination of the generator phase angle phi is carried out, and on basis of this determination a continuous adjustment of thyristors - the aperture angle is carried out, thus the aimed, successive load connection of the generator on the network (soft-connecting) is obtained. Furthermore the procedure includes a new method to determine the generator phase angle phi by registering the time of zero circulation on the phase voltage, and at the same time detection of the respective thyristor voltage zero circulation point at a measuring method based on measuring of the thyristor voltage. The novelty of the invention consists in adjusting the ignition point of the thyristors successively to the phase angle phi , thus the connecting degree resulted to the thyristors is increased in a controlled speed regardless of the variations registered in the phase angle during the connecting course, i.e. in the principle the thyristor aperture angle is reduced, when phi increases and so on. L'invention porte sur la procédure de raccordement d'un générateur polyphasé asynchrone à un réseau à tension alternative polyphasée. Le raccordement se fait au moyen d'un dispositif électronique réglable à base de thyristors ou d'éléments de raccordement (réglables) dont le degré de raccordement peut varier pendant le processus de raccordement pour obtenir un raccordement en douceur limitant au maximum l'ampérage. Pendant la totalité du processus de raccordement, on mesure en permanence l'angle de phase phi du générateur en fonction de quoi, on procède à un réglage continu des thyristors et de l'angle d'ouverture pour obtenir le raccordement (en douceur) du générateur au réseau. La procédure comporte en outre une nouvelle méthode de détermination de l'angle de phase phi du générateur consistant à enregistrer le temps de circulation nulle sur la tension de phase et en même temps à détecter le point de circulation nulle sur les t