SELF-EXCITATION SYSTEM OF SYNCHRONOUS GENERATOR

The invention pertains to electrical engineering, particularly to branch of automation of electrical machines. Self-excitation system of synchronous generator is proposed, which comprises three-phase synchronous generator with connected in star scheme stator winding with neutral wire and independent excitation winding, which is shunted by diode conduction direction of which is reverse to the conduction direction of circuit. The reverse diode is inserted between common cathodes of thyristors of three-phase controlled rectifier, which is connected to the stator phases and through diode in direction of conductance is connected to the aforementioned neutral wire of stator winding. In parallel to the reverse diode a capacitor is switched in and through another diode is connected a low-powered electronic generator with start and stop control inputs.The starting signal of electronic generator is applied at the first control input from the frequency and voltage measuring device that is switched in between one phase winding and neutral wire of stator winding. The signal of voltage level from said measuring device is aapplied to one of starting inputs of thyristor control unit, outputs of which are connected to the gates of thyristors respectively. The second control input of thyristor control unit and the second control input of electronic generator are connected to one plate of capacitor and to the common point of anodes of diode brought to circuit in parallel with capacitor. Izgudrojums attiecas uz elektrotehniku, konkrēti - uz elektrisko mašīnu automātikas nozari. Ir piedāvāta sinhronā ģeneratora pašierosināšanas sistēma, kas sastāv no trīsfāžu sinhronā ģeneratora, kura statora ģenerējošais tinums ir saslēgts zvaigznes slēgumā ar nullvadu, un neatkarīgas ierosmes tinuma. Minētais ierosmes tinums ir šuntēts ar reverso diodi un ir ieslēgts trīsfāžu tiristoru vadāmā taisngrieža slodzes ķēdē starp statora ģenerējošā tinuma trīs fāžu izvadiem pieslēgto tiristoru kopā savienotajiem katodiem un šī tinuma nullvadu virknē ar ķēdes vadāmības virzienā ieslēgtu diodi, kurai paralēli ir pieslēgts kondensators, pie kam caur diodi ir pieslēgts tā sākotnējās uzlādes mazjaudas elektroniskais ģenerators ar palaišanas un bremzēšanas signālu ievadiem. Palaišanas signāls elektroniskā ģeneratora pirmajā vadības ievadā tiek saņemts no frekvences un sprieguma mērīšanas bloka, kas ir pieslēgts starp ģeneratora fāzi un neitrāli. Sprieguma līmeņa signāls no minētā bloka tiek padots uz tir