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Relay na Reactance

Relay na reactance yana cikin abu biyu: elemen na overcurrent da elemen na current-voltage directional. Elemen na current ya kawo positive torque, amma elemen na current-voltage directional ya kawo torque mai sauƙa kan elemen na current, bata da phase angle daga current zuwa voltage.

Relay na reactance yana cikin relay na overcurrent tare da directional limitation. Elemen na directional an sanar da shi don kawo maximum negative torque idan current ta gine lagga voltage tare da 90°. Induction cup ko double induction loop structures suna da muhimmanci wajen sake faɗa relay na distance na reactance-type.

Girman Relay na Reactance

Relay na reactance na tsari na induction cup structure an samun haka a cikin hoton. Yana da sabbin poles tare da operating coils, polarizing coils, da restraining coils. Operating torque an samu ne daga interaction na magnetic fluxes daga current-carrying coils (ya'ni, interaction na fluxes daga poles 2, 3, da 4), amma restraining torque an samu ne daga interaction na fluxes daga poles 1, 2, da 4.

A cikin yanayin faɗa relay na reactance, operating torque yana da shakka sama da square na current, wanda yake nuna cewa takwasuwar current suna da tashin tattalin magnitude. Amma, restraining torque yana da shakka sama da product na voltage da current, bayan ya zama cos(Θ−90°), wanda yake nuna cewa an yi tattalin voltage, current, da kuma phase angle.

Kamar yadda ake nuna a hoton, resistor-capacitor (RC) circuit an amfani da ita don kawo da adjust da achieve masu desired maximum torque angle tare da inganta impedance characteristics don kontrol phase shifts. Idan an ambaci control effect a matsayin -k3, equation na torque zai iya bayyana dynamic equilibrium relationship daga operating da restraining torques. Equation na wannan yana nuna tattalin relay na torque tun daga electrical parameters, wanda ke taimakawa wajen analysis da design optimization.

ida Θ, yana da shakka sama da positive idan I ya gine lagga V. A balance point net torque yana da zero, kuma haka

A cikin equation na, spring control effect an yi saukin saboda tushen da take da shi, ya'ni, K3 = 0.

Characteristic na Operation na Relay na Reactance

Kamar yadda ake nuna a hoton, characteristic na operation na relay na reactance yana ciki a matsayin vertical line perpendicular zuwa horizontal axis. Hakan, X yana nufin reactance value na protected line, da R yana nufin resistance component. Characteristic na wannan yana nuna cewa operation na relay yana da shakka sama da reactance component, ba da shakka da changes na resistance. Area da ke kusa da characteristic na operation curve yana cikin positive torque region (ya'ni, operating zone na relay). Idan measured impedance yana zaune a wannan area, relay yana yi amsa, wanda yake taimaka wajen protection na short-line, domin yake taimaka da fast, reliable operation.

Idan τ a equation na torque ba 90º ba, straight-line characteristic non-parallel zuwa R-axis zai samu, kuma relay da wannan yana nufin angle impedance relay.

Relay na wannan ba zan iya dace faults a cikin its own ko adjoining sections a transmission lines. Unit na directional ta differe da impedance relays' saboda reactive volt-amperes su ne near zero. Saboda haka, yana bukatar unit na directional inactive under load. Ideal for ground fault protection, reach ta stays unaffected by fault impedance.