micomp521技术使用说明书v1c.doc

MiCOM P521 电流差动保护装置 技术说明书 版本 1.C 上海施耐德电气电力自动化有限公司 中国上海闵行区浦江镇漕河泾高科技园 F 区 新骏环路 188 号 6 号楼 邮编 201114 电话：+86 (0) 21 3357 6888 传真：+86 (0) 21 3357 6999 目 录 1. 装置简介 - - - - - - - - - Deleted: 2. 原理和应用 2.1 2.1.1 I1 I2 Idiff = I1 + I2 k2 k1 Is1 Is2 I bias = I1 + I2 2 P1001ENd A B En d A End B tB3 * = (tA - tp2) tp1 = tp2 = 1/2 (tA* - tA1 - td) tA1 Current vecto rs tB1 tp1 tA1 tA2 tB2 tB* tA3 td tB3 * tB3 tA*_ _ tA4 tA5 tp2 tB3 tA1 td rs Current vecto tB4 tB5 tA1, tA2 - A tB1 , tB2 - B tp1 - A B tp2 - B A td - tA1 B B tB3 tA* - tB3 A tB* - tA1 B tB3 * - A tB3 P1002ENa A B A B B A tA1 B B tB3 ° ° 33kV 375A 33kV 400/1 350/1 0.94A 1.07A 1 2 P2055ENa CT = 1 0.938 = 1.071 CT = 1 1.071 = 0.938 2.1.2 INPUT Block t I [50/51] Phase OC I ? Yes No = 1 t I RELAY I TRIP Backup I threshold exceeded RELAY I START Protection Comms Failed CB Fail Blocks I Yes No BLO CK I Start CB Failed t CBF P2003ENa [50/51] Phase OC I ? RELAY I START Yes No = 1 t I Backup threshold I exceeded Protection Comms Failed t sel 1/2 t I INPUT BLO CK t I = 1 RELAY I TRIP INPUT Select Logic 1/2 t I P2004ENa t ? ? K ? ? = T× + L ? ( ) ? I/ Is ?1 α ? ? α α Ι Ι Ι Ι Ι Ι Ι Ι Ι Ι Ι Ι Ι Ι Ι t = ? K× ? ? 0 339 . ? 1 0.236 ? / I/ Is ( )?? (I I ) S t = T× ? ? ? ?1? ? K ? ( ) ? I/ Is ? 2 2.1.3 Ttrip = 2 K - Te. log ( e 2 K Ip/I θ - Trip ) 2.1.4 2.1.5 CB Fail Undercurrent elements Ia Ib = 1 CB Failed RELAY CB Fail Ic RL1 Energised = 1 tBF INPUT Start tBF CB Fail Block I? Yes Block I Start No CB Fail Block Ie ? Yes Block Ie Start No P2005ENa 2.1.6 A B P5 xx P5 xx P1021ENa Ι DDT = P1022ENa 2.1.7 ? ? ? ? ? 2.1.8 Protection Undercurrent elements Ia RELAY I START Ib = 1 RELAY I TRIP Ic IN PUT 52a P2002ENa 2.1.9 2.1.10 2.1.11 2.2 2.2.1 2.2.2 2.2.3 2.2.4 IN PUT Bl k Log 1 Enable Blocking logic Block 1 Idiff No Yes Operate Idiff t I diff RELAY t Idiff ALARM Idiff Disabled Enable Back-up Protection Block 1 tI No Yes Block 1 tI No Yes See Overcurrent and Earth Fault Section Figures 5 and 6 Block 1 Th