22F-RF012-BS

22F-RF012-BS

22F-RF012-BS

在改变发电机的励磁电流中，一般不直接在其转子回路中进行，因为该回路中电流很大，不便于进行直接调节，通常采用的方法是改变励磁机的励磁电流，以达到调节发电机转子电流的目的。常用的方法有改变励磁机励磁回路的电阻，改变励磁机的附加励磁电流，改变可控硅的导通角等。

这里主要讲改变可控硅导通角的方法，它是根据发电机电压、电流或功率因数的变化，相应地改变可控硅整流器的导通角，于是发电机的励磁电流便跟着改变。这套装置一般由晶体管，可控硅电子元件构成，具有灵敏、快速、无失灵区、输出功率大、体积小和重量轻等优点。在事故情况下能有效地抑制发电机的过电压和实现快速灭磁。

Summa Four Cisco VCO IV K Switch 16T1 2 x DC

Cisco PRP-2 Performance Route Processor GSR12000

90 Day Warranty - Free Overnight Shipping!

Nortel 8668 DS1404068 Metro Ethernet Services Module 

90 Day Warranty - Free Overnight Shipping!

Juniper M5 Router AC PE-1GE-SX M5BASE-AC-E RE-600-512

90 Day Warranty - Free US Shipping!

Cisco 15454E-E1-42 High Density 42-Port E1 Card

30 Day Warranty - Free Shipping

Alcatel 3EZ00902DAA 01 8-Port Gig SX SFP 7470 Router?

90 Day Warranty - Free Overnight Shipping!

Alcatel OS8800 OS8-GNI-U24 UNPOPUTATED 1000BASE Ports

90 Day Warranty - Free Shipping!

IBM 6-way 600MHz RS64 IV Processor 16MB RS6000 21P4511

We accept Corporate PO's Make Me an Offer!

Juniper IB-OC192-SON-SR2-E - Enhanced 1 Port OC192 M160

List Price $235,000.00 - 90 Day Warranty - Free Ship!

Juniper ERX1440 COC12FO-SM-I/O Channelized OC12/STM4 IO

90 Day Warranty - Free Shipping!

Juniper ERX-OCXA256M-MOD ERX1440 OC3/OC12/DS3 Line Card

90 Day Warranty - Free Overnight Shipping

Juniper M5 Router AC PE-1GE-SX M5BASE-AC-E RE333-768

90 Day Warranty - Free US Shipping!

Cisco OC192E/POS-SR-SC 1 Port OC192c/STM64c POS Edge LC

90 Day Warranty - Free Shipping!

Juniper ERX-COC12SM-A-IOA Channelized OC12 for ERX 1440

90 Day Hardware Warranty - Free Shipping!

Juniper PE-2CHDS3 2-port Channelized DS3 PIC M7i M10i

90 Day Warranty - Free Shipping!

Juniper PC-10GE-SFP-B T320 M320 T640 T1600 Router PIC

90 Day Warranty - Free Shipping!

Motorola River Delta BSR64000 1:8 DOCSIS HD Module

90 Day Warranty - Free Shipping!

Juniper T320-FPC2 2-Port PIC Concentrator T320 Router

90 Day Warranty - Free Shipping!

NEW Juniper PE-2E3-ATM2 2-Port E3 ATM2 IQ PIC M7i M10i

90 Day Warranty - Free Shipping!

Juniper PWR-T320-DC-S T320 Power Entry Module DC Power

90 Day Warranty - Free Overnight Shipping!

Newbridge Alcatel 90-7582-01 7670 Switching Control SSC

90 Day Hardware Warranty - Free Shipping!

Nokia NIF4450 4Port Gigabit Eth ADP Interface IP1280

90 Day Warranty - Free Worldwide Priority Shipping!

Nortel Passport 8310 2x 8393SF Ethernet Routing Switch

45 Day Warranty - Free Shipping!

Spirent Adtech AX/4000 400320 OC-48c OC48c STM-16c SM

90 Day Warranty - Free Shipping!

Extreme Black Diamond 8800 10G4Xa 41612 4-port 10G XFP

90 Day Warranty - Free Overnight Shipping!!!