1、 G Y /T 181 2002 Protecting distance of radio radiation interference from AC electrified railway to television relay broadcasting and transposer station(s) 2002-03-18 2002-05-01 1 1 2 1 3 1 4 1 3 7 9 GY/T 181 2002 GB/T 15708-1995 GB/T 6113-1995 80 24 18 A B C GY/T 1812002 1 1 48.5MHz 958MHz ( ) 2 GB
2、/T 6113-1995 GB/T 7400.2-1987 GB/T 14431-1993 / GB/T 15708-1995 3 3.1 television relay broadcasting station(s) 3.2 television transposer station(s) 3.3 TV usable field strength ( ) 3.4 R.F. protection ratio 3.5 protecting distance 4 48.5MHz 958MHz , G Y /T 181 2002 Protecting distance of radio radia
3、tion interference from AC electrified railway to television relay broadcasting and transposer station(s) 2002-03-18 2002-05-01 GY/T 181-2002 2 ( ) 450m 200m GB/T 14431-1993 A B C GY/T 181-2002 3 48.5MHz 958MHz A1 A1 A1 A1.1 GB/T 6113-1995 (GPIB) A1.2 GB/T 6113-1995 A1.3 GPIB IEEE488 A1.4 50 A2 A2 A3
4、 A ( ) E2 H1 E1 H2 P1 P2 GY/T 181-2002 4 A2 A3 A3 48.5MHz 958MHz A4 3m 1m A5 A5.1 20m A5.2 20m A6 20m 10kV GPIB GPIB 1 2 1 2 GPIB GY/T 181-2002 5 12dB A7 A7.1 A4 5 A7.2 A7.2.1 15 A7.2.2 A7.2.1 18 A7.2.1 18 15 A7.3 8 A7.4 A7.5 B A8 A8.1 A8.5 A8.1 A8.2 A8.3 / RF A8.4 A8.5 GY/T 181-2002 6 A4 GY/T 181-2
5、002 7 B ( ) B1 B1.1 , 9 18 B1.2 B1.3 80% Ei, B1 5 T1 T2Tm Ei Ei (B1) (T1+T2+Tm)/T=0.8 .(B1) T=18 B1 B2 80% 80% 80% 80% 80% B2.1 n 80% Eav (B2) , dB( V/m) = = n 1 i av i )/n E ( E (B2) T1 T 2 T m Ei E T tGY/T 181-2002 8 Ei i n B2.2 n Sn (B3) 1) (n ) E (E S n 1 i 2 av i n = = (B3) B2.3 L (B4) dB( V/m)
6、 L Eav+KSn (B4) K 80% t n B1 B1 80% n K n 8 9 10 11 12 13 14 15 20 25 30 35 K 1.30 1.27 1.24 1.21 1.20 1.19 1.18 1.17 1.12 1.09 1.07 1.06 GY/T 181-2002 9 C ( ) C1 EImax (C1) dB( V/m) EImax=ETmin-S/I (C1) ETmin dB( V/m) 10m 55dB( V/m) GB/T 14431-1993 S/I 3.5 dB 43.9dB C2 E20 20m 18 80% 80% (C2) dB( V/m) E20=Eav+KSn (C2) Eav n 80% (B2) dB( V/m) K 80% t n B1 Sn n (B3) C3 Dmin (C3) , m Dmin=D20 10 0.166B 20 E E Imax 20 (C3) B 1 6dB D20 20m GY/T 1812002 * : : 010 86093424 86092645 100866 15.00
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