3500/50

三个不利之处：一是每次事故灭磁对转子绝缘是一次冲击，当冲击次数太多使转子绝缘下降后对机组设备不利；二是对灭磁开关开断带来困难，在空载误强励下甚至有开不断的可能，至少加重了对触头的烧损；三是可能在滑环间造成击穿（广西电力系统已有Ur过高导致灭磁时滑环击穿事故，如拉浪电厂），或者在转子绕组的进出线两端击穿，如乌江渡电厂96年10月2号机定子AB相突然短路，转子出现大于5000A电流，转子过电压将转子进出线两端击穿短路，造成续流灭磁。其转子电流按转子本身时间常数(几秒）衰减，灭磁时间长达几秒，使定子AB相短路点烧损严重，以至喷弧将转子16个磁极上绕组对地烧穿。

可见，灭磁非线性电阻残压Ur选择过高对发电机转子等设备非常不利（有关方面分析见参考文献[1]）。如果选Ur =1600V，可能更为合理，特别对灭磁开关开断有利。

改进措施：  在保持氧化锌阀片能容量不变情况下，将氧化锌阀片重新匹配组合，使Ur下降至1600V以下。

ALLEN BRADLEY 24VDC 3C/O RELAY SER.D 700-HA33Z24

ALLEN BRADLEY FLEX I/O TERMINAL BASE SER.A REV.A01 1794-TB3 99141

ALLEN BRADLEY ENHANCED BAR CODE DECODER 2755-DS4A SER. B REV. F

ALLEN BRADLEY MOTOR STARTER 709-BOD SERIES K W/ 815-B0V4 SERIES K RELAYS

ALLEN BRADLEY OPERATING HEAD  40146-013-59

ALLEN BRADLEY 10A 300VAC KEY INTERLOCK SWITCH 802F-TF6SM11 SER. A

ALLEN BRADLEY  COMMNICATION MODULE CAT. REV B01  1756-DNB/A

ALLEN BRADLEY 9/SERIES BACKPLANE CONTROL BOARD 8520-32MB3 160671 REV. 03

ALLEN BRADLEY SAFETY INTERLOCK SWITCH WITH GUARD LOCKING 440G-MT

ALLEN BRADLEY HANDLES

ALLEN BRADLEY 24VDC FLEX I/O ADAPTER MODULE 1794-ADN SER. A

ALLEN BRADLEY 110/120VAC COIL SIZE 0 STARTER 709-AOD103 SER. K

ALLEN BRADLEY AMBER PUSH BUTTON 800T-PT16 SER T

ALLEN BRADLEY BLUE PUSH BUTTON 800T PT16 SER T

ALLEN BRADLEY WHITE PUSH BUTTON 800T-PT16 SER T

ALLEN BRADLEY REMOTE/LOCAL I/O SCANNER MODULE 5150-RS5/A

ALLEN BRADLEY 4PIN 22AWG DC MICRO STRAIGHT CABLE SER A 889D-F4EC-10

ALLEN BRADLEY 110/115-120VAC COIL 18A SIZE 0 AC CONTACTOR 500-AOD930 SER. B

ALLEN BRADLEY ASCII I/O MODULE 1771-DA SER. A FIRMWARE REV. B

ALLEN BRADLEY 24VDC 10A RELAY, 700HA33A24 SER. D,

ALLEN BRADLEY REMOTE I/O ADAPTER MODULE 1771-ASC SER. A F/W REV. F

ALLEN BRADLEY SP-135771 ( 135771 ) SURGE SUPPRESSOR KIT, REV 03 MOV 1,

ALLEN BRADLEY ControlLogix PROCESSOR UNIT 1756-L55/A F/W 1.4 W/ 1756-M12A

ALLEN BRADLEY REMOTE I/O ADAPTER MODULE 1771-ARC SER.B FW REV. A

ELECTROMECHANICAL CONTACT OUTPUT MODULE 177.1-0W16/B

ALLEN BRADLEY REVERSING STARTER MOTOR 505-AOD SERIES C

ALLEN BRADLEY HARDWARE KIT 77156-117-51

ALLEN BRADLEY 5-30V DC SELECTABLE INPUT MODULE 1771-IQC

ALLEN BRADLEY  ON DELAY TIMER SER A   700-HS12AZ24

ALLEN BRADLEY SOLID STATE TIMER 700-RTC00110U1 SER. A

ALLEN BRADLEY PROGRAMMING TERMINAL 1201-HA2 SER. B FRN 1.07

ALLEN BRADLEY SIZE 3 200/230/460/575V 25/30/50HP STARTER 512-DDB-6-26 SER. B

ALLEN BRADLEY BULLETIN 889N QD CORDSET 889N-F4AF-20F SER. B

ALLEN BRADLEY  COMMUNICATION CABLE  1772-CS

ALLEN BRADLEY T CONNECTOR 5 PIN

ALLEN-BRADLEY 10-30VDC 200mA 50MM INDUCTIVE PROXIMITY SENSOR 871R-D50NP90-D4

ALLEN-BRADLEY 800MR-B2AK SER C, SMALL ROUND EXTENDED PUSH BUTTON HEAD,

ALLEN BRADLEY 2755-LD4C4 HIGH PERFORMANCE VISIBLE LASER DIODE SCANNER  SEALED

ALLEN BRADLEY PRESET SPEED CONTROLLER 160-BA06PPS1 SER. C FRN. 7.04

ALLEN BRADLEY 600V 24A FINGER-SAFE TERMINAL BLOCK 1492-HM2

ALLEN BRADLEY OVERLOAD RELAY 592-B0V16 SER. A

ALLEN BRADLEY 1770-RG PLC-2 FAMILY REPORT GENERATION MODULE,

ALLEN BRADLEY BULLETIN 1329 2 HP. INVERTER DUTY MOTOR 1329RS-HA00218FCF

ALLEN BRADLEY SYSTEM POWER SUPPLY MODULE 1772-P1 SER. C

ALLEN BRADLEY 1.5KW/2HP VARIABLE FREQUENCY AC DRIVE 1305-BA04AX SER. C PLASTIC

ALLEN BRADLEY I/O SCANNER MODULE REMOTE 1774-SR SER. B REMANUFACTURED

ALLEN BRADLEY GRAND TRANSFORMERS 34AMPS DC CHOKE 21803-018-04

ALLEN BRADLEY 700-HB32Z24 & 700-HB33Z24 RELAYS LOT OF 8

ALLEN BRADLEY AC OUTPUT MODULE SERIES B 1771-OA

ALLEN BRADLEY 0.32A-1.0A CLASS-10 OVERLOAD RELAY SER.B 193-EA1CB 99739

ALLEN BRADLEY DRIVER BOARD 50403 REV. 11

ALLEN BRADLEY 800MS-HX2B SELECTOR SWITCH UNIT,

ALLEN BRADLEY 0-24V CONTACT OUTPUT MODULE 1771-OZL SER. A

ALLEN BRADLEY GLASS FIBER OPTIC CABLE 99-52-1096 SER C

ALLEN BRADLEY 1336-SMC-BSP1A MAIN CONTROL BOARD, MANUFACTURER REFURBISHED

ALLEN BRADLEY 150V MAX SURGE SUPRESSOR 700-N24 SER. B LOT OF 10

ALLEN BRADLEY ACCESSORY KIT  75006-140-01

ALLEN BRADLEY Ser B 100AMP 600VAC - 250VDC DISCONNECT SWITCH 149V-DS100

ALLEN BRADLEY 24VDC SINK INPUT MODULE 1734-IB4 SER. B

ALLEN BRADLEY AUXILIARY CONTACTS SER.A  100-FA40

ALLEN BRADLEY AC DRIVE 1336E-B015-AA-EN-HA2-L8E SER D

ALLEN BRADLEY CONTACTOR SIZE 0 18AMP. 115-230V 50/60 HZ 509-AOD SERIES B

ALLEN BRADLEY 110/115-120VAC COIL 18A SIZE 0 MOTOR STARTER Ser.B 509-AOD

ALLEN BRADLEY ISOLATED DC OUTPUT MODULE 1771-0Q SER. B

ALLEN BRADLEY STARTER SER.B 500F-B0D93

ALLEN BRADLEY 110/120VAC COIL 10A CONTROL RELAY 700-F400A1 SER. C LOT OF 10

ALLEN BRADLEY 800T-QB10 SERIES T 120 VAC/VDC ILLUMINATED PUSH BUTTON,

ALLEN BRADLEY OVERLOAD THERMAL UNIT W10

ALLEN BRADLEY OVERLOAD HEATER  LOT OF 2 W34

ALLEN BRADLEY 800T-XA2, CONTACT BLOCK, 2 NO, SERIES D,

ALLEN BRADLEY TIME DELAY RELAY 700-HSF22F29Z24 SERIES A

ALLEN BRADLEY 1336E-B015-AA-EN-HA2-L7E DRIVE

ALLEN BRADLEY CONTACT CARTRIDGE W/ LATCH SER.A  800E-2LX03V 99348

ALLEN BRADLEY CABLE AWM 2464

ALLEN BRADLEY FLEX I/O TERMINAL BLOCK 96145476 REV A02 1794-TB3 SER A

ALLEN BRADLEY 110/120V COIL CONTROL RELAY 700-BR800A1 SER. A

ALLEN BRADLEY 10A SINGLE POLE CIRCUIT BREAKER 1492-SP1C100 SER. C

ALLEN BRADLEY 1770-RG PLC-2 FAMILY REPORT GENERATION MODULE,

ALLEN BRADLEY  COMMUNICATION ADAPTER MODULE  1785-KA

ALLEN BRADLEY 600V 30A 3-POLE TRAILER FUSE BLOCK 1494V-FSR633 SER. A

ALLEN BRADLEY 3-PHASE 24VDC COIL 25A 600VAC MAX CONTROL RELAY 700-CF310ZJ SER. A

ALLEN BRADLEY SERIES B 1492-CB1F080 277 VAC 65 VDC CIRCUIT BREAKER,

ALLEN BRADLEY 110/115-120V COIL CONTROL RELAY 700-PK200A1 SER. B

ALLEN BRADLEY CONTROL CIRCUIT TRANSFORMER 1497-N5 A

ALLEN BRADLEY REVERSING CONTACTOR SIZE O 115-120V COIL 509-AOD SER. B

ALLEN BRADLEY 100A 600V 3 POLE TRAILER FUSE BLOCK 1494V-FSR611 SER. B

ALLEN BRADLEY 12 BIT ANALOG OUTPUT EXPANDER MODULE 1771-E4

ALLEN BRADLEY 100A 600V 3 POLE TRAILER FUSE BLOCK 1494V-FSR622 SER. B

ALLEN BRADLEY PILOT LIGHT MTG RING 800T-N226 SER-C

ALLEN BRADLEY BULLETIN 712 COMBINATION STARTER 712-162D-16

ALLEN BRADLEY 3-AXIS SERVO AMPLIFIER 8520-AA12 SER. A

ALLEN BRADLEY  OUTPUT MODULE SLC500 SER.C  1746-OV16

ALLEN BRADLEY ArmorBLOCK I/O MODULE BASE 1792D-CB18 SER. B

ALLEN BRADLEY 100-FAB11 SER B FRONT MOUNT AUXILIARY CONTACT, LOT OF 4,

ALLEN BRADLEY  120 V AC/DC INPUT MODULE REV A04  1771-IA/C

ALLEN BRADLEY  SER B MODULE WITH LATCH   800E-3DL3GX20

ALLEN BRADLEY CIRCUIT BOARD 1336-SN-SP13A / 74101-785-52 REV-C

ALLEN BRADLEY 15KW/20HP DC DRIVE 1395-B69-C1-P12 SER. B

ALLEN BRADLEY 27A 600V SER.B MOTOR STARTER 500F-B0930

ALLEN BRADLEY 1794-OW8 FLEX I/O OUTPUT MODULE 96223671

MRC DOUBLE ROW BALL BEARING, 5310-M/H501,

ALLEN BRADLEY 384K RESOURCE MANAGER MODULE 5130-RM2/A

ALLEN BRADLEY CNC CONTROL BACKPLANE BOARD 8000-GA

ALLEN BRADLEY 120V COIL 76A86

ALLEN BRADLEY POWER CIRCUIT BOARD 50906 REV 08

ALLEN DYNAMIC BRAKE REV.03 50411-002

ALLEN BRADLEY 110/120VAC COIL TYPE N AC RELAY 700-NM400 SER. D

ALLEN BRADLEY 1794-0B16P Ser A FLEX I/O Rev A01 96268274

ALLEN BRADLEY 16 AXIS SERCOS INTERFACE MODULE 1756-M16SE SER-A REV-006 F/W-13.7

ALLEN BRADLEY SERIES A PRESSURE CONTROL SWITCH 836T-T253JX81X15

ALLEN BRADLEY 1772-MR MEMORY SEGMENT (RAM)

ALLEN BRADLEY STARTER 71A86 120V 60 CY

ALLEN BRADLEY REV F02 TTL OUTPUT MODULE 1771-OG

ALLEN BRADLEY RED LED LAMP 800E-N157R

ALLEN BRADLEY RELAY 700-HB33Z24 SER. D

ALLEN BRADLEY PROGRAMMABLE TIMER 700-FS-100JU23 SER.B

ALLEN BRADLEY ISOLATED RS232 COMMUNICATIONS BOARD 46702-031-01 A

ALLEN BRADLEY DEVICENET COMMUNICATIONS MODULE USERS MANUAL 74002-103-03

ALLEN BRADLEY PANELVIEW 1000 2711-T10C15 SER B REV D FRN 4.00

ALLEN BRADLEY 110/120VAC TYPE RTA SOLID STATE TIMER 700-RTA99V000A 1 SER. B

ALLEN BRADLEY DC SELECTABLE INPUT MODULE 1771-IQ/B LOT OF 2

ALLEN BRADLEY 110/115-120VAC COIL NEMA SIZE 0 18A AC CONTACTOR 509-AOD SER. B

ALLEN BRADLEY PILOT LIGHT LAMP BULB SER.B  800T-N169 102810

ALLEN BRADLEY TTL INPUT MODULE 1771-IGD SER. A

ALLEN BRADLEY  COMMUNICATION CABLE  1202-C10 SER A

ALLEN BRADLEY  CABLE 9 PIN  1326-CPB1-E-005 SER B

ALLEN BRADLEY 800MS-CB5A SMALL SQUARE PUSH BUTTON UNIT, SERIES A,

ALLEN BRADLEY CONTACTOR 100-C85D00/100-S SER.A/100-C85DJ10 SER.A 690V 100A

ALLEN BRADLEY PanelView OPERATOR INTERFACE CONTROL BOARD 77129-014-85(B)

ALLEN BRADLEY 1792D-CBFM SER. B  FACTORY SEAL

ALLEN BRADLEY REMOTE I/O ADAPTER 1771-ASB

ALLEN BRADLEY 25HP MOTOR CONTROL CENTER UNIT SER.K YUW934216/1AI (2112) 104354

ALLEN BRADLEY PRESET SPEED CONTROLLER 160-BA06PPS1 SER. C FRN. 7.06

ALLEN BRADLEY PCB BOARD 90072 / 8000AFA

ALLEN BRADLEY 0-264VAC/VDC INTERFACE MODULE SER.B 1492-IFM20F 104956

ALLEN BRADLEY PLC-5 CONTROL COPROCESSOR MODULE 1771-DMC4 SER. A F/W REV. E

ALLEN BRADLEY  EXPANSION MODULE  1775-LX A

ALLEN BRADLEY PERIPHERAL COMMUNICATION MODULE 1775-GA

ALLEN BRADLEY 200 A 600V TERMINAL BLOCK X-181460

ALLEN BRADLEY SINGLE-POLE 0.8A CIRCUIT BREAKER 1492-G008 SER. B  LOT OF 13

ALLEN BRADLEY SLC500 OUTPUT MODULE 1746-OX8 SER. A MISSING DOOR