ABB DCS AC800M模块 PM866K01 PM861AK02
ABB DCS AC800M模块 PM866K01 PM861AK02
ABB DCS AC800M模块 PM866K01 PM861AK02
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接地变压器为三相变压器，如图1-1所示，常用来为不接地系统提供一个人工的、可带负载的中性点，以供连接中性点设备使用。
图1-1接地变压器原理接线图
接地变压器通常采用Z型接线，与普通变压器的区别是每相绕组分别绕在两个磁柱上，这样连接的好处是零序磁通可沿磁柱流通，所以Z型接地变压器的零序阻抗很小(10Ω左右/相)，而普通变压器要大得多。因此规程规定，用普通变压器带消弧线圈时，其容量不得超过变压器容量的20%，而Z 型变压器则可带90%~100%容量的消弧线圈。接地变压器除可带消弧线圈外，也可带二次负载，替代站用变压器，这样，可使接地变压器与站用变压器合二为一，既减少了损耗和建筑物面积，又节省了***。
由于三个同芯绕组构成的安匝相反的三个系统，且A、B、C三相提供的零序电流同向，故每相的零序磁势近乎为零(由于每柱两绕组间有漏磁通道，零序阻抗不可能为零)，相对于变压器的短路阻抗来讲零序阻抗要小得多。
对于ZN型接地变压器，通常可带一个二次绕组，组成ZNyn11或ZNyn1连接组别，供变电站站用电，起到了一台变压器两种功用的效果。
接地变压器零序阻抗是接地变压器的一个重要的参数，要求每相不大于9Ω，否则，接地变压器的零序阻抗太大会造成单相接地故障时，零序阻抗上分压过大，施加在消弧线圈上的电压过低，消弧线圈达不到额定出力。因此消弧线圈投运前要先测接地变压器零序阻抗。测量接线图如图1-2所示。
图1-2 接地变压器零序阻抗测量接线图
测量时，按图接线，然后读取电压表和电流表的读数，则接地变压器的零序阻抗值为：
Z=U/I
将测量结果和接地变压器的铭牌参数相比，看接地变压器的零序阻抗达到出厂要求没有或接地变压器的零序阻抗符不符合现场试验要求。
woodward 126443 communication cable
woodward 376104 lsg-10
woodward 5441689 24/120 i/o
woodward 1326-183
woodward 1691-143+b842 netcon expansion chassis
woodward 1720-707 panel switch, spdt
woodward 1720-713 panel switch, spdt
woodward 1720-719 panel switch, spdt
woodward 1751-147d 4 ch. mpu transformer
woodward 1751-6058b
woodward 1751, -673 extractor, top handle
woodward 1751-675 extractor, bottom handle
woodward 1785-655 100 ohm rtd to 0-5 volt converter
woodward 1790-789 intel memory card 4 mb
woodward 1790-791
woodward 1790-9026
woodward 1803-105
woodward 1843-325 digital meter
woodward 1886-313 tm25 torque motor
woodward 1887-031
woodward 3005-510 filter assembly
woodward 3005-517 filter assembly
woodward 3052-141 gasket
woodward 3081-847 cpu connection
woodward 31902-02 505 display
woodward 3313-055 metering sleeve
woodward 3462-757
woodward 3462-757
woodward 3462-758
woodward 376-104 lsg-10
woodward 4199j51 standard summe board
woodward 5403-535 cables, 501
woodward 5403-536 cables, 501
woodward 5403-616 govenor cables
woodward 5403-824 multipin 8ft cable
woodward 5403-975 cable
woodward 5403-977 netcon cables
woodward 5403-978 netcon cables
woodward 5405-818 cables, 501
woodward 5405-819 cables, 501
woodward 5410-995
woodward 5412-033
woodward 5415-623 control cables
woodward 5415-625 control cables
woodward 5415-625 control cables
woodward 5415-703 control cables
woodward 5415-737 control cables
woodward 5415-738 control cables
woodward 5415-816 control cables
woodward 5415-851 netcon cables
woodward 5415-852 netcon cables
woodward 5415-856 control cables
woodward 5415-858 control cables
woodward 5415-966 replace by 5416-348
woodward 5416-190 cable
woodward 5416-337 cable
woodward 5416-338 cable
woodward 5416-338 netcon cables
woodward 5416-339 cable
woodward 5416-351 netcon cables
woodward 5416-352 netcon cables
woodward 5417-032 cable
woodward 5417-040 micronet cable
woodward 5417-173 micronet cable
woodward 5417-175 cable
woodward 5417-176 cable
woodward 5417-413 cable
woodward 5417-417 cable
woodward 5421-112
woodward 5421-123
woodward 5421-178
woodward 5430-856 ext. card
woodward 5430-929
woodward 5432-039
woodward 5432-157 seq.power module
woodward 5434-334
woodward 5437-027 module, chassis assy dcs 509 vfd
woodward 5437-051 relay module, 32 ch
woodward 5437-076 netcon power supply
woodward 5437-077 inactive, r/b 9907-077
woodward 5437-078 netcon main chassis
woodward 5437-078 netcon main chassis
woodward 5437-079 ftm (field termination)
woodward 5437-080 ftm
woodward 5437-081 power supply
woodward 5437-092 netcon
woodward 5437-173 ftm (field termination)
woodward 5437-281 linknet-ftm parts
woodward 5437-282 ftm (field termination)
woodward 5437-283 ftm modules
woodward 5437-406 linknet-ftm parts
woodward 5437-417 linknet-ftm parts
woodward 5437-418
woodward 5437-465 linknet-ftm parts
woodward 5437-484 ftm (field termination)
woodward 5437-523 ftm, analog 8 channel
woodward 5437-524 ftm, t/c 8 channel
woodward 5437-672 linknet-ftm parts
woodward 5437-686 linknet-ftm parts
woodward 5437-687 ftm (field termination)
woodward 5437-843 micronet chassis
woodward 5437-844 micronet chassis
woodward 5437-845 notch filter 3khz.
woodward 5437-860 chassis - netcon 5000 i/o
woodward 5439-076 24 vdc power supply
woodward 5439-273 501 chassis
woodward 5439-555
woodward 5439-730 netcon power supply
woodward 5439-751
woodward 5439-754 netcon expansion chassis
woodward 5439-754 netcon expansion chassis
woodward 5439-760 netcon main power supply
woodward 5439-764 power supply
woodward 5439-766 power supply
woodward 5439-800 power supply
woodward 5439-861 chassis - use 503 vfd w/o fans
woodward 5439-927 509 chassis
woodward 5439-929 power supply assy- 509
woodward 5439-966 netcon expansion chassis
woodward 5439-984 120v ac power supply
woodward 5439-986 chassis
woodward 5441-407 relay module, 5 amp, 28 ch
woodward 5441-409 10 amp relay interface
woodward 5441-413 32 channel relay interface
woodward 5441-419 16 channel relay interface
woodward 5441-629 5 amp relay interface
woodward 5441-635 opto isolator
woodward 5441-637 5 amp relay interface
woodward 5441-645 10 amp relay 28 ch
woodward 5441-661 relay interface
woodward 5441-663 relay int
woodward 5441-669
woodward 5441-671 10 amp relay interface
woodward 5441-673 relay module, 5 amp, 8 ch
woodward 5441-689 24/120 i/o
woodward 5441-691 replaced by 1751-6091
woodward 5441-693 relay interface 12ch aftm1099a
woodward 5441-695
woodward 5441-697 i/o
woodward 5441-889
woodward 5448-906 control spm-d10
woodward 5448-906 control spm-d10
woodward 5450-106
woodward 5453-278 micronet chassis
woodward 5453-750 netcon/micronet ethernet interface
woodward 5453-754 netcon/micronet ethernet interface
woodward 5460-735 speed control
woodward 5460-796 pressure channel
woodward 5460-836 speed sensor
woodward 5460-837 speed reference
woodward 5460-838 frequency control
woodward 5460-839 auxiliary module
woodward 5460-840 pressure reference
woodward 5460-841 auxiliary module
woodward 5460-842 power sensor
woodward 5460-843 power channel
woodward 5460-844 final driver
woodward 5461-002
woodward 5461-062
woodward 5461-082 voltage input (0-10 or 0-5 vdc)
woodward 5461-083 discrete in
woodward 5461-086
woodward 5461-088 do
woodward 5461-117 ps a-19
woodward 5461-290 high volt p/s
woodward 5461-292 secondary power supply
woodward 5461-331 master cpu
woodward 5461-622+b2 load control ?
woodward 5461-639 cpu module
woodward 5461-640 ps aux
woodward 5461-641 module assy - dcs ii ftc
woodward 5461-642 discrete input
woodward 5461-643 discrete output
woodward 5461-644 analog output (4-20 ma)
woodward 5461-646 sio module
woodward 5461-647 speed input
woodward 5461-648 transceiver
woodward 5461-650 t/c input
woodward 5461-651 analog input - 8 channel 4-20 ma
woodward 5461-652 current input
woodward 5461-653
woodward 5461-654 8 ch rtd/input
woodward 5461-655
woodward 5461-656
woodward 5461-659 discreet module
woodward 5461-661 current output isolated - 507 (8 channel)
woodward 5461-768 speed control
woodward 5461-769 speed reference
woodward 5461-770 speed control
woodward 5461-771 speed reference
woodward 5461-772 temp control
woodward 5461-773 sw mode
woodward 5461-774 freq. control
woodward 5461-775 amb. bias ramp
woodward 5461-776 accel. schedule
woodward 5461-777 decel. jump rate
woodward 5461-778 liq. final driver
woodward 5461-779 fuel transfer card/board
woodward 5461-780 gas final driver
woodward 5461-781 synchonizer
woodward 5461-798 n1 speed control
woodward 5461-880 rtd
woodward 5461-892
woodward 5461-944 speed control
woodward 5461-975 power supply dcs 2 lv
woodward 5461-975 power supply dcs 2 lv
woodward 5462-017 dcs digital spd sensor
woodward 5462-085 final driver
woodward 5462-117 pos transducer
woodward 5462-236
woodward 5462-244 liq. final driver
woodward 5462-268 mother board for 505
woodward 5462-292 speed sensor
woodward 5462-336 speed sensor
woodward 5462-338 power aux card
woodward 5462-443 fuel transfer card/board
woodward 5462-472
woodward 5462-482
woodward 5462-518 speed sensor
woodward 5462-519 speed control
woodward 5462-520 speed reference
woodward 5462-521 power sensor
woodward 5462-522 power control
woodward 5462-523 power refernce
woodward 5462-524 extraction control
woodward 5462-525 pressure prefernce
woodward 5462-526 ratio limiter
woodward 5462-527 valve ramp
woodward 5462-528 final driver
woodward 5462-529 valve ramp
woodward 5462-530 final driver
woodward 5462-531 auxiliary
woodward 5462-532 pressure channel
woodward 5462-533 power prefernce
woodward 5462-578 high volt p/s
woodward 5462-581
woodward 5462-584 dcs motherboard
woodward 5462-651 analog 8ch 4-20ma input
woodward 5462-718 speed sensor
woodward 5462-749 coprocessor
woodward 5462-750 sec. power supply
woodward 5462-753
woodward 5462-756
woodward 5462-757 discrete input
woodward 5462-758 discrete output