LCI原理1

LCI 原理

phase for delta-delta connected. The secondary voltage is determined by the drive voltage, for Tanggang it is 2. 4KV. For the delta-wye configuration, the secondary terminal buses will lag the corresponding primary terminals, buses by 30 degrees.

一次侧和二次侧绕组对应的端子应按相序角－角连接。二次侧电压由驱动电压决定，唐钢是２.４ＫＶ。对于角－星接法，二次侧端母线将滞后于一次侧端母线３０度。

8.The transformer is designed to meet the general requirements of ANSI C57.12.00 plus the applicable requirements of ANSI C57.18 (since it is for rectifier service) and GEDS specification 305A1096. Audible sound level meets the requirements of NEMA TR-27.

变压器的设计要求符合ANSI C57.12.00和ANSI C57.18及GEDS 规范305A1096。噪音水平符合要求NEMA TR-27。

9.air cooled transformer: 空冷变压器

a.Typical temperature rise is 65 degrees over 40 degrees. C ambient. 环境温度４０度以上典型温升为６５度。

b.The secondary winding test specification includes: 二次侧测试标准包括

Test specification测试标准 Voltages电压 Norminal Voltage (V) 标准2.4 电压 BIL (KV) 45 4.16 60 19 Applied Voltage (KV) 应用15 电压 c.Accessories includes: 还包括：

Three winding-temperature indicator-relays with contacts. 带触点三相绕组温度指示继电器

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LCI 原理

Note: 注意：Since the LCI power converter is fuseless, transformer impedance is sized to limit fault current without excessive damage to the bridge.

由于ＬＣＩ功率变频器是不带保险的，变压器阻抗用来限制电流故障而不对桥造成额外的损坏。

11.Do not daisy chain the grounding cables from the transformer with the LCI lineup grounding cables. They should go to building ground direct.

不要将变压器接地与ＬＣＩ接地电缆结成一条环链，它将直接进入建筑接地。 12.Interface (No interface with Tanggang LCI system) 接口（唐钢LCI系统无接口）

a.Transformer overtemperture alarm and fault contacts (N.C.) are monitored by MSC. 变压器超温报警和故障接触器（常闭点）由MSC监控。

b.Any tripping action contacts should wire to remote operator station. 任何跳闸触点应用电缆接到遥控操作员站。

源侧电流（波形）Source Side Current (Waveform)

1.The source line current is sensed by a 2500:1 CT. There are two CTs located at the back of the bridge. One CT for A phase and the other for C phase. Phase B current is made from phase A and phase C base on the fact that the sum of all three phase current is zero at any time.

源侧线电流通过2500:1的CT感知。桥的背面有两个CT，一个用于A相，另一个用于C相，B相电流根据任意时间三相电流总和为零而计算得出。

2. The CT current feedback signals are received by the fcsa card (located at the right hand side of bridge front ).

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LCI 原理

CT电流反馈信号由fcsa板（位于桥前部的右侧）接收。

3. The CT current feedback signals are then routed to vpbl (located at the bottom of the vme rack in the control compartment).

CT电流反馈信号被送到vpbl （位于控制柜VME机架底部）。

4. PU current is sized by burden resistors on the vpbl pcb. In the LCI electronic module ( VME rack), fcgd pcb (sa locates in slot 5 and sb located in slot 7) received the A and C phase signals, reconstructs B phase current and produces IA, IB and IC signals.

PU电流大小取决于vpbl pcb上的分担电阻。在LCI电子模块里( VME 机架),，fcgd pcb (sa位于 5槽，sb 位于7槽)接收 A 和 C相信号，重建B相电流，并产生IA, IB 和 IC信号。

5. Phase current IA, IB and IC signals are combined to line currents which are used for IR and IX compensation. Absolute value circut on board FCGD combines the 3 phase current to form IFB signal which is scaled 3Vdc = 1 PU. (1 pu DC current is 1008 amp DC). IFB is equivalent to DC link current which is scaled 1. 2825 times the AC phase current, 1. 2825 = 3. 141592654 / sqrt(6)

相电流IA, IB 和 IC信号合成了用IR和IX补偿的县电流。FCGD板上电路绝对值合成了三个相电流，形成了3Vdc = 1 PU. (1单位直流电流是1186 安培)的IFB信号。IFB等于直流连接电流等于1.2825倍的交流相电流，1.2825= 3. 141592654 / sqrt(6)。

6. Interface see sh. 11AA

of the bridge elementary. Sh. 1AD Sh. 1AF and

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LCI 原理

Sh. 1FA Sh. 1FC

of system elementary

接口见桥原理图的11AA页，系统原理图的1AD ， 1AF ， 1FA 和 1FC页。 7. Source Current Waveforms (IA, IB, IC and IFB of sa-fcgd): 源侧电流波形(IA, IB, IC 和IFB of sa-fcgd):

waveform #01形1 waveform #02形2 waveform #03形3 waveform #04形4 waveform #05形5

波waveform #06波形waveform #15波形6 15 波waveform #07波形waveform #16波形7 16 waveform #20波形波waveform #10波形waveform #17波形20 10 17 波waveform #11波形waveform #18波形11 18 波waveform #12波形waveform #19波形12 19 Source Side Voltage (Waveform) 源侧电压（波形）

1.For Tanggang 2KV system it is 2400Vac. 唐钢2KV系统是2400Vac。

2. Line to neutral voltage is attenuated at NATO pcb (located at top shelf of the source bridge compartment). Five attenuated voltage signals (Van, Vbn, Vcn, Vpn, Vnn) from NATO are transmitted to VPBL pwb (located at the bottom of VME rack) by means of 20 pins ribon cables.

线对中性点电压在NATO pcb（位于源侧桥控制柜的架子顶部）衰减。NATO的五个电压衰减信号(Van, Vbn, Vcn, Vpn, Vnn)通过20针扁平电缆发送到VPBL pwb。

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