04-714049-02海南期货行情走势图怎么看
日期：2024-3-4液压系统以其功率大、惯性小、响应速度快、调速范围宽及易于实现过载保护等突出优点而在矿山机械中被广泛采用。调速回路是液压系统中最主要的回路形式之一，在采煤机、绞车等各种场合应用非常广泛。传统的液压调速方式是从液压系统本身考虑，主要有节流调速和容积调速，这两种传统的液压调速方式在实际应用上各有其局限性。随着现代电子技术的发展，交流变频技术日益成熟。
由于各类液压泵和马达都存在一定的容积损失，系统压力变化后，马达转速势必也有所改变，尽管本系统采用了转速反馈的闭环控制，但是为了提高系统响应速度，在马达进口设置了一个压力传感器，采集系统压力值并传递给控制器，控制器根据系统压力值适当对其输出控制参数进行调整，例如在系统压力升高时，适当提高输入给变频器的电压值以增加液压泵的转速，补偿系统的容积损失。本系统是典型的泵控马达回路，在液压领域普遍应用，主要用于采煤机、液压绞车或回转工作台等。
作机械负载特性对变频调速的要求根据负载特性，一般要求通用变频调速器在额定转速（对应额定频率50Hz）以上为恒功率调速特性。额定转速以下为恒转矩调速特性。同时为应用在风机、水泵等流体机械上达到更好的节能效果，应具有减低转矩调速特性。
如果它们的供电全部或部分由市电提供，在系统电网波动中，这些设备将会因为电源问题而误动作或不能正常运行，从而引起装置停车。低压变频器在化工生产中，由于生产工艺的需要，如需要对进入反应器的原料或催化剂的进料量按照配比严格控制。或在连续生产过程中，对进人反应单元的固体物料的批料重重严格称量控制。以保证电网波动结束系统电压恢复正常后，实现高压异步电动机自启动。该方法控制线路简单、整定方便、维护量小。
低压异步电动机在化工生产装置中，电动机控制最常用方式一般为起停按钮与交流接触器、热继电器的组合方式。化工生产装量的防电网波动技术措施针对以上的不同类型的设备，我们可以分别采取一些有效技术措施，来减少或者梦免电网波动给化工生产装置带来的影响。但需要强调的是，化工生产有其自身很强的生产规律户技术和安全要求。我们在实施防电网波动技术改造之前，首先要进行全面、深人的论证。实施这些防波动技术措施后，不会给操作人员和生产装置带来新的安全隐患或使危害扩大，其次，要认真分析在电网波动过程中，影响生产装置安全运行的关键设备和关键因素，尽量减少要采取特殊措施的设备数量。
由于企业电网系统内部各类原因（雷击、误操作、污闪等）所造成的电网瞬时波动，平均每年达到2.5次（局部及大面积的停电除外）。每次均对各子、分公司的化工生产装置造成了不同程度的影响和损失。最严重的一次，曾造成十余套生产装置停车，经济损失巨大。
在正常情况下，企业电网的供电质量是完全可以满足这些技术指标的，但由于化工企业供电网络的特点，冲击性负荷的投入，特别是各类故障和事故的发生，都会影响到供电质量（当然，前者可以通过合理调度安排予以减少或避免，而后者则无法彻底避免）。其具体表现为电网电压闪变幅度超标，电网电压瞬时向下突降，对生产装置中运行的各类电仪设备造成影响而使其故障或停运，从而使生产装置停车。我们一般将这种电网电压瞬时向下突降的现象，通俗地称为“电压波动”。其时间和幅值由于短路形式和保护参数设置有关。
同商压异步电动机一般，化工企业中的冷冻机组、空压机组等设备均采用大功率的高压异步电动机驱动，这往往会造成生产装置冷t无法平衡、工艺参数发生变化而导致装置停车。其次，要认真分析在电网波动过程中，影响生产装置安全运行的关键设备和关键因素，尽量减少要采取特殊措施的设备数量。
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GENELECTR BENTLY NEVADA 21504-00-36-10-02 RQANS2
GENELECTR BENTLY NEVADA 330180-92-05 RQAUS1
BENTLY NEVADA 3500 Transient data Interface I/O module 11A01K45
GENELECTR BENTLY NEVADA 19000-00-07-36-02 RQANS2
GENELECTR BENTLY NEVADA 330180-50-05 RQANS2
GENELECTR BENTLY NEVADA 21504-00-32-10-02 RQAUS1
BENTLY NEVADA 21504 000 040 10 02 SENSOR PROBE
NOS! BENTLY NEVADA PC BOARD PWA72202-01 72201-01-04-01-01-01-01 PWA72203-01R
Bently Nevada 3300 Series Dual Thrust Monitor 3300/20 PWA 79482-01
GENELECTR BENTLY NEVADA 330101-00-08-05-02-00 RQAUS1
Bently Nevada 3300/20-01-05-02-00-00 Dual Thrust Monitor 25-0-25 mils 20 mA
Bently Nevada 125840-02 Power Supply Module 3500 System PLC 12584002 Bentley
Bently Nevada 3300 Series System Monitor 3300/03 PWA 87890-01 P
Bently Nevada AC Power Supply 125840-02 85-132 VAC 250V 4.5/6.25 Amp New
GENELECTR BENTLY NEVADA 130539-30 RQANS1
GENELECTR BENTLY NEVADA 72052-01 RQAUS1
Bently-Nevada 81545-01 Terminal Module LOT OF 2
Bently Nevada 81545-01 Relay Board 78462-01 H - New No Box
GENELECTR BENTLY NEVADA 330103-00-02-10-02-02 RQANS2
Bently Nevada Proximity Probe 3300 XL 11 MM -- 330702-00-40-10-01-00 -- New
GENELECTR BENTLY NEVADA 135137-01 RQAUS1
NEW BENTLY NEVADA 330980-70-00 3300 XL NS PROXIMITOR SENSOR 7M D538567
GENELECTR BENTLY NEVADA 106765-25 RQANS1
GENELECTR BENTLY NEVADA 7846202 RQAUS1
GENELECTR BENTLY NEVADA 21504-00-08-10-02 RQANS1
Bently Nevada Accelerometer Interface Module Model 156942-01 P/N 24145-XX -24VDC
GENELECTR BENTLY NEVADA 3120-190 RQAUS1
GENELECTR BENTLY NEVADA 3301/00-50-02 RQAUS1
GENELECTR BENTLY NEVADA 81544-01 RQANS2
Bently Nevada 7200 76683-01 Proximitor Sensor PLC Module 5 Metre 35mm 7668301
BENTLY NEVADA Proximity Probe & Housing Assembly 26530-12-10-03-018-250-22-00-01
Bently Nevada Proximitor Probe 330909-05-29-10-0200 NEW
Bently Nevada 43460-01 / ASSY 26631-01 G PLC Bentley SNK613232 4346001 2663101
Bently Nevada Eccentricity Monitor 3300/40 PLC Module 88859-01 88796-01 82924-01
GENELECTR BENTLY NEVADA 3300/01 RQAUS1
MZ-493, BENTLY NEVADA 3300/40-02-01-01-00-00 ECCENTRICITY MONITOR. +1 TO +5 V.
GENELECTR BENTLY NEVADA 125800-01 RQANS2
BENTLY NEVADA 330102-10-45-20-02-05 3300 XL 8MM
Bently Nevada 3500/40M Proximitor Monitor 3500 Series PWA 140734-01 Rev. B
Bently Nevada 78462-01-AB Record Terminals New
Bently Nevada 3500/20 Rack Interface Module 350020 PLC Bentley 3500 System
Bently Nevada 83729-01 P 84152-01 XDUCR I/O & Record Terminals 78599-14 PLC
Bently Nevada 125704-01 TMR Relay Module 3500 PLC 12570401 Bentley
Bently Nevada 7000 Velomitor XDucer I/O & Record Terminal 107321-01
Bently Nevada 9000 Series Display 90120-02-xx 15617-01
Bently Nevada 3300 49532-24-01-05-01-01-01-01-01 Vibration Control PWA 48253-01
Bently Nevada 72851/01-04-01-03-01-00-00-15 Vibration Control PWA 72852-01
Bently Nevada PWA 78434-01 Temperature Control PLC Module PWA 7843401 110 V
Bently Nevada 10 Slot Rack Chassis 87840-01 3300/05-24 PLC Bentley PWA87840 Card
BENTLY Nevada 3300 XL 11MM 330704-000-050-10-02-05
Bently Nevada 78432-01 PLC Input Relay Card 3300 System Power Supply 7843201
Bently Nevada 82927-01 79748-01 XDCR I/O Record Terminal 78599-06 PLC Relay Card
BENTLY NEVADA 146031-01 TRANSIENT DATA INTERFACE I/O MODULE (133-2)
BENTLY NEVADA 78432-02 PC TERMINAL DISTRIBUTION BOARD *NEW NO BOX*
BENTLY NEVADA PWA 72302-01-AA CIRCUIT BOARD **
NEW BENTLY NEVADA 36363-XX PROXIMITOR 36363, 158576-04
NEW BENTLY NEVADA 2 WIRE TRANSMITTER
Bently Nevada BA 21500-00-08-17-02 Vibration Sensor Probe PLC Monitor 7200
Bently Nevada 21505-24-40-10-02 Vibration Sensor Probe PLC Proximity 7200
BENTLY NEVADA PROXIMITY PROBE 27890-1-00-30-10-2 NEW
Bently Nevada FieldMonitor 1701/10 (24 volt DC Power Supply)
Bently Nevada 26631-01 Terminal Strip 26872-01 19298-01
BENTLY NEVADA VELOCITY SEISMOPROBE , P/N 24646-07-05-03 ,VIBRATION SENSOR , NEW
Bently Nevada 330101-00-20-05-02-00 Probe - New Surplus
GENELECTR BENTLY NEVADA 330101-00-12-10-02-00 RQANS2
BENTLY NEVADA 125800-01 KEYPHASOR I/O MODULE *NEW NO BOX*
BENTLY NEVADA 146031-01 TRANSIENT DATA INTERFACE I/O MODULE ***XLNT***
New Bently Nevada 330180-XO-05 3300 XL 5/8mm PROXIMITOR SENSOR
Bently Nevada 990-04-70-01-00 2 wire Vibration Transmitter 5B
Bently Nevada PROBE PROXIMITY VIBRATION 5MM Sensor 21500-00-40-05-02
Bently Nevada PROBE PROXIMITY VIBRATION 8MM Sensor BA21504-00-36-05-02 7200
Bently Nevada 330171-XX-XX-10-02-05 proximity vibration sensor probe
Bently Nevada 7200 series 21500-00-28-05-02 proximity vibration sensor probe
Bently Nevada 21500-00-08-10-02 proximity vibration sensor probe
Bently Nevada Transducer motion motional pick up 190 series probe 28607-018-02
Bently Nevada 3300 XL 8mm 330103-00-02-10-12-05 sensor probe
Bently Nevada 3300 XL 8mm 330103-00-06-10-12-05 sensor probe
Bently Nevada 3300 XL 8mm 330103-00-07-10-12-05 sensor probe
Bently Nevada 3300 XL 8mm 330103-00-08-10-12-05 sensor probe
Bently Nevada 3300 XL 8mm 330173-00-03-10-02-05 sensor probe
Bently Nevada 3300 XL 8mm 330103-00-09-10-02-05 sensor probe
GENELECTR BENTLY NEVADA 72072-01 RQAUS1
NEW BENTLY NEVADA 330180-91-00 3300 XL 5/8MM PROXIMITOR SENSOR D553324
Bently Nevada - Dual RTD Temperature Monitor - P/N: 90199
BENTLY NEVADA 3115 2800 PROXIMITOR ***XLNT***
DG401 Bently Nevada System Monitor 3300/03
DG407 Bently Nevada Dual Vibration Monitor 3300/16 XY/GAP
Bently Nevada 21500-00-08-05-02 proximity vibration sensor probe
GENELECTR BENTLY NEVADA 330101-00-40-10-02-05 RQANS1
Bently Nevada 330100-50-02 Proximitor Sensor 3300 5 MM 8 MM 5 Metre Cable PLC
Bently Nevada 330980-X1-05 -- 5 Metre System - New
#868 Bently Nevada PWB78434-01 C PWA78432-01 110Vac ?Input Relay Circuit Board
NOS! BENTLY NEVADA PC BOARD PWA72302-01 72301-01-04-02-03-01-15 PWB72303-01
Bently Nevada Proximity Sensor 330980-70-05 3309807005 7.87 V/mm 24 VDC
GENELECTR BENTLY NEVADA 126648-01 RQANS2
8Meters Armored Extension Cable For GE Bently Nevada 3300 XL Proximitor Sensor
GENELECTR BENTLY NEVADA 330902-00-20-10-02-00 RQANS1
NEW Bently Nevada 3300 XL 330180-X0-05 Proximitor Sensor
GENELECTR BENTLY NEVADA 90340B-016 RQAUS1
GENELECTR BENTLY NEVADA 330854-040-25-05 RQANS1
GENELECTR BENTLY NEVADA 330101-26-40-10-02-00 RQANS2
GENELECTR BENTLY NEVADA 330101-00-20-05-12-00 RQAUS1
GENELECTR BENTLY NEVADA 21501-00-12-10-02 RQANS2
GENELECTR BENTLY NEVADA 330100-50-00 RQAUS1
GENELECTR BENTLY NEVADA 21501-00-12-10-02 (7200) RQANS2
GENELECTR BENTLY NEVADA 106765-25 RQANS2
GENELECTR BENTLY NEVADA 126615-01 RQAUS1
GENELECTR BENTLY NEVADA 330102-08-16-10-02-05 RQAUS1
Bently Nevada 3500/20 Rack Interface Module 125744-02 W PLC Bentley 3500 System
GENELECTR BENTLY NEVADA PWA88199-01 RQAUS1
GENELECTR BENTLY NEVADA 72708-01 RQANS2
GENELECTR BENTLY NEVADA 147663-01 RQANS2
FREESHIPSAMEDAY BENTLY NEVADA 72708-01 TACHOMETER PANEL 335 7270801
GENELECTR BENTLY NEVADA 19004-02-12-18-02 RQAUS1
GENELECTR BENTLY NEVADA 20929-06 RQAUS1
NEW BENTLY NEVADA 83024-00-16-90-02 7200 SERIES PROXIMITY SENSOR PROBE D538332
GENELECTR BENTLY NEVADA 90340B-04D RQAUS1
BENTLY NEVADA 78462-01Y XDCR I/O & RECORD TERMINALS **
Bently Nevada 330101-00-24-10-02-05 Probe 3300 Series
NEW BENTLY NEVADA 3300 NSV CABLE PART #1X35668 NEW IN INGERSOLL RAND PACKAGE
BENTLY NEVADA 2155/00-08-01-01-01-11-11-11-00-00 TDXNET TRANSIENT DATA
Bently Nevada 3300/12-01-20-00 Power Supply Unit Board Mondule
Bently Nevada 78596-01D Transformer 7859601D -
GENELECTR BENTLY NEVADA 81544-01 RQAUS1
GENELECTR BENTLY NEVADA 84345-02 RQAUS1
Bently Nevada 130732-01 13073201 Velomitor Terminal Card SAR
1PC BENTLY NEVADA 128031-01C 88AB
Bently Nevada 126615-01 PROXIMITOR I/O MODULE -
GENELECTR BENTLY NEVADA 133442-01 RQANS2
GENELECTR BENTLY NEVADA 20929-01 RQAUS1
Bently Nevada 3300/01 System Monitor 820
Bently Nevada 7200 Vibration Monitor Meter 0-15 MILL 0-18 V GAP 215-4637
Bently Nevada 3300 Series Power Supply 3300/12 PWA88219-01 Rev. F
NEW BENTLY NEVADA 330105-02-12-10-02-00 3300 XL 8MM REVERSE MOUNT PROBE D553378
GENELECTR BENTLY NEVADA 125800-01 RQAUS1
BENTLY NEVADA 19049-04 PROXIMITOR -18 TO -24VDC *NEW IN BOX*
BENTLY NEVADA PWB38101-01 MODULE *NEW NO BOX*
BENTLY NEVADA 135137-01 3500/45 POSITION I/O MODULE D554161
BENTLY Nevada 3300Xl NSv 330902-00-10-10-02-00
Bently Nevada 3300/15 Dual Vibration Monitor 3300/15-03-01-01-00-00-00 78392-01
Bently Nevada Probe Proximity 21504-00-68-10-02
Bently Nevada Probe Proximity 21504-24-44-05-02
BENTLY NEVADA I/O & RECORD TERMINAL 81544-01 NEW-NO BOX 8154401
New Bently Nevada Velocity Seismoprobe 16699-10 Vibration Sensor 25" Probe
Bently Nevada Trendmaster 2000 101284-02-01-01 TIM Line Isolator PLC Bentley
BENTLY NEVADA 200150 G09D0116 ACCELEROMETER NEW
BENTLY NEVADA ACC-R CIRCUIT BOARD 37050 PWA72802 / PWA72928-01 / A72828-01
Bently Nevada 3300 Series Dual Vibration Monitor 3300/16 XY/GAP PWA 86739-01 M
Bently Nevada 3300 Series Dual Vibration Monitor 3300/16 XY/GAP PWA 86739-02 U
Bently Nevada 3300 Series Dual Vibration Monitor 3300/16 XY/GAP PWA 86739-01 U
Bently Nevada 3300 XL Proximitor Sensor 330180-90-05 Asset Condition Monitoring
GENELECTR BENTLY NEVADA 330101-00-25-10-02-00 RQAUS1
NEW BENTLY NEVADA 330901-00-20-05-01-00 3300 XL NSV PROXIMITY PROBE D553375
GENELECTR BENTLY NEVADA 21504-004-016-10-02 RQANS1
Bently Nevada 18745-03 High Temp 7200 Series Proximitor
Bently Nevada 7200 Power Supply 72055-01 PS S-7200-R
NEW BENTLY NEVADA 72102-01Z PRINTED CIRCUIT BOARD 72009-01H POSITIVE RECORD
GENELECTR BENTLY NEVADA 20229-01-02-018-84-006-01 RQAUS1
GENELECTR BENTLY NEVADA 126648-01 RQAUS1
GENELECTR BENTLY NEVADA 78596-01D RQANS2
GENELECTR BENTLY NEVADA 7213006 RQAUS1
BENTLY NEVADA 330104-00-06-10-02-00
NEW BENTLY NEVADA 72302-01V PRINTED CIRCUIT BOARD POSTIVE RECORD PWA 72009-0IF
Bently Nevada Modul PWA101879-01 D OVP
Bently Nevada XDUCR I/O Record Terminals 8/545-01 GEB
Bently Nevada XDUCR I/O Record Terminals 8/546-01 GEB
BENTLY NEVADA 3300XL 11mm 330730-040-01-00 3307300400100 -un-
Bently Nevada XDUCR I/O Record Terminals 81544-01 GEB
GENELECTR BENTLY NEVADA 72065-01K RQANS2
BENTLY NEVADA 18745-03 PROXIMITOR **
Bently Nevada 2155/00 TDXnet PLC Transient Data Interface Rack Chassis Cage TDIX
BENTLY NEVADA 3300/03-01-02 CHANNEL TEMPERATURE MONITOR **
NEW BENTLY NEVADA 72102-01Z PRINTED CIRCUIT BOARD 72009-06H POSITIVE RECORD
GENELECTR BENTLY NEVADA 3300/25-01-XX-XX-00-00-03-00 RQAUS1
GENELECTR BENTLY NEVADA 330101-XX-XX-10-02-00 RQANS1
GENELECTR BENTLY NEVADA 330101-00-30-10-12-00 RQANS1
GENELECTR BENTLY NEVADA 133827-02 RQAUS1
Bently Nevada 72308-02 Thrust Monitor
Bently Nevada 330930-065-00-00 3300 XL NSv Cable Extension
ONE BENTLY NEVADA Bently 330101-00-08-05-02-00
Bently Nevada 3300 Series System Monitor 3300/01-06-00 83989-01
GENELECTR BENTLY NEVADA 330101-00-40-05-02-00 RQANS2
Bently Nevada 330101-09-51-10-02-05 inductive proximity vibration sensor probe
Bently Nevada 330908-09-51-05-02-05 inductive proximity vibration sensor probe
GENELECTR BENTLY NEVADA 330130-040-02-00 RQANS1
GENELECTR BENTLY NEVADA PWA8499 RQAUS1
Bently Nevada 90120-0252 Analog Display Module Series 9000 Working
Bently Nevada 330908-09-95-02-05 NSv inductive proximity vibration sensor probe
GENELECTR BENTLY NEVADA 82364-01 RQANS2
GENELECTR BENTLY NEVADA 40180-02 RQANS2
GENELECTR BENTLY NEVADA 330102-00-12-10-02-01 RQANS1
Bently Nevada 330101-00-36-10-02-05 3300 XL Probe
Bently Nevada 3300/03-03-00 System Monitor Board Dynamic Data Interface
New BENTLY NEVADA Cable Splash Resistant Acceleration Accelerometer 25' 130539-2
GENELECTR BENTLY NEVADA 330106-05-30-02-05 RQANS2
NEW BENTLY NEVADA 126648-02 3500/25 ENHANCED KEYPHASOR MODULE D538311
NEW BENTLY NEVADA 330303-20-50-90-00-00 3300 HTPS SENSOR D534501
GE Bently Nevada Trendmaster 2000 Transducer Interface Module
BENTLY NEVADA 27890-2-00-30-90-2 CABLE
NEW BENTLY NEVADA SIX CHANNEL TEMPERATURE MINITOR 81228-01 79492-01 YJ664762
BENTLY NEVADA 330701-00-40-10-02-05 NEW
BENTLY NEVADA P/N 330701-00-40-10-02-05 PROBE NEW
GENELECTR BENTLY NEVADA 330101-00-20-10-12-00 RQAUS1
NEW Bently Nevada 3300 XL 8MM Vibration Probe 330101-00-70-10-02-00
BENTLEY NEVADA CUSTOM 70000 SERIES PROXOMTOR *NEW
Bently Nevada PWA87840-01 Backplane Board Rev. B