弱电基础知识.doc

-11 2 3 1I 20m 20m 12 3M Id Rd Ud = IdRd Ud 2 C M Ud C U M Ut = Ud -U RpM Rp2 UtRp2 RB IB = UfRB+Rp2 Ut = IBRB = Uf RBRB+Rp2UtM 2 M U Uf Ut U = 0 Uf = UdUt = UdRBRB+Rp 2Ut U 0.8m 1.8m Ut4 2 C U1 U2 Uk = U1 - U2 Uk IB Rp RB Rp IB = UkRB2Rp Ut = IBRB = UkRBRB+2p Uk 0.8m Uk 0.8m 2 U1 U1= Ud Uk 2 UkmU1 U 2 Uk = 0 540mRd = Rd1(n) 1Rd1n . IM UM IM Rds UM = IMRds 1 1 4Zi ZPl ZP2 ZiZP1ZP2 ZTZi IECZi 4 ZP1ZP2ZP1ZP2 4 50V 50100V . ZT ZT 500V ZTZTZT Ri 5 5 Z5 500.2 1 Z11000 0.5Z5 10000.5Z55 5 2 Z2 = 200 = 200 +0.55 200 3 11 IEC 1 120V 2 60V21 IEC 5 P R T5 6 X 6 15 100Hz 0.5mA15100Hz 10mA IB t 77 500mA 100ms 14 7 c1 5 c250 c3 50 7IB = IrefF 2IB mAIrefmAF 2 7 15100Hz 100Hz 450Hz 40005000Hz 20kHz 1MHz 100Hz 500Hz 50Hz 110 100Hz 50Hz Ff Ff f 50Hz 100Hz 1000Hz 8 9 1000Hz 10000Hz 10IEC 10kHz 100Hz 10mA 100mA 100kHz 100kHz 100kHz 2 11 2 500ms 2mA 300mA 300mA 30mA 300mA 300mA 3 3 12ab 12c 13ab 13 IEC p; Irms Ip Ipp Iev 7 11 IB 1.5 Iev = Ipp2 0.75 Iev = Ip2 0.1s 11 0.75 1.5 IEC 13 1.5 0.75 Iev Ipp(22)= Ip(22) Ipp2 = Ip2 13Irms = Ip2 Ip2 Iev Irms2 2IrmsIev Irms2 Irms 14 ab Ip 120 1.5 Iev 0.75 Iev 120 0.75 1.5 Iev IEC 1.5 IEC 0.75 Iev 120 15ts tp tstp p = ts(tstp)I1rms Ip2I2rms I1rmsp IEC IEC 16 1.5 p p 1 Ievp 0.1 I1rms 0.75 p10.1 16 I1rms 17ab 17c 10ms 7 0.lms10ms Fe I2tFe =0tii2dtFe Fq It Fq =0tiidt 5 t1 1e =0.3679 T ti = 3T 18 Fe(50100)10-6A2s 18 C W 100V 100nF K 10C 0.5mJIEC 10ms Fq Fe 19 50 Fq 0.005As Fe