Wani Phase Synchronizing Device?

Mi ce ta Phase Synchronizing Device?

Takaitaccen Phase Synchronizing Device

Phase Synchronizing Device (PSD) ita ce tashar gajarta da take iya sanya abin da ake yi a kan circuit breaker poles zuwa zero crossing na phase voltage ko kuma current waveform.

Controlled Switching Device

Kuma ake kira Controlled Switching Device (CSD), wanda ya ba da damar inganta wani lokaci a matsayin da ake yi a kan circuit breaker operations.

Voltage da Current Synchronization

PSD yana amfani da voltage da current waveforms don in samun zero crossings da kuma sanya breaker operations saboda haka.

A nan da ake koye circuit breaker don cutta inductive load, ita ce mafi kyau a karin current a zero crossing na current waveform. Amma, wannan ita ce abin da ba a zama da shi a fili. A cikin circuit breakers na musamman, karin current ana faru a nan, amma ba a zero crossing point bane. Saboda load ce inductive, wannan faru na abin da suka haifar da high rate of current change (di/dt), wanda ya ba da high transient voltage a cikin system.

A cikin low ko medium voltage power systems, transient voltage a nan da ake yi a kan circuit breaker operation ba za a iya tabbas sa performance. Amma, a cikin extra da ultra-high voltage systems, ita ce mafi yawa. Idan contacts na circuit breaker ba su da shiga a nan da ake yi a karin, re-ionization zai faru saboda transient overvoltage, wanda zai ba da re-established arcing.

Idan ake koye inductive load kamar transformer ko reactor, da kuma circuit breaker yana close a nan da ke dace a zero crossing na voltage, zai faru high DC component of current. Wannan zai iya saturate core na transformer ko reactor. Wannan zai ba da high inrush current a cikin transformer ko reactor.

A nan da ake koye capacitive load, kamar capacitor bank, ita ce mafi kyau a karin circuit breaker a zero crossing na system voltage waveform.

Amma idan ba a nan da ake yi a karin, high inrush current zai faru a cikin system. Wannan zai iya ba da over voltage a cikin system bane.

Inrush current da over voltage stress zai haifar da capacitor bank da wasu abubuwa masu line mechanical da electrical.

A cikin circuit breaker, duka uku phases yana koye ko koyar da dace. Amma, akwai 6.6 ms time gap a nan da zero crossings na adjacent phases a cikin three-phase system.

Wani device ce take voltage waveform daga potential transformer na bus ko load, current waveform daga current transformers na load, auxiliary contact signal da reference contact signal daga circuit breaker, closing and opening command daga control switch na circuit breaker da ake fito a control panel.

Voltage da current signal daga kowane phase zai bukata don in samun exact instant na zero crossing na waveform na individual phase. Breaker contact signals zai bukata don in lalace operational delay na circuit breaker, saboda haka opening or closing pulse to the breaker zai iya taka da shi saboda haka, don in sanya interruption da zero crossing na either current ko voltage wave, kamar da rikitar.

Wani device ce take manual operation na circuit breaker. A nan da ake yi faulty tripping, trip signal to the circuit breaker zai taka da shi directly daga protection relay assembly, bypassing the device. Phase Synchronizing Device ko PSD zai iya a bayyana da bypass switch wanda zai iya bypass the device daga system idan ake buƙata a nan.

Inductive Load Management

A nan da ake koye inductive loads a wani lokacin da ke dace, zai iya hada high inrush currents wanda zai iya haifar da abubuwa.

Capacitive Load Switching

Timing na daidai a nan da ake koye capacitive loads zai iya hada risk na high inrush currents da kuma overvoltage.