69334006

变频器是工业电动机节能的主要手段，节能效率在30%左右，效果显著，同时，它还具有卓越的调速和保护功能。但是变频器是典型的非线性用电设备，使用过程中会产生大量的特征次谐波，这些谐波污染电网，对用电设备的安全稳定性构成严重的威胁；同时由于畸变无功的存在，变频器综合用电功率因数比较低，严重降低了配电设备的使用效率。本文重在介绍一种对变频器进行针对性的谐波治理和无功补偿的设备。

　　1.前言

　　十二五时期，我国将把大幅度降低能源消耗作为适应社会主义市场经济要求的长效机制。近年来，经过全国大量变频节能项目的实施，验证了变频节能是一项提高电能高效利用的技术措施，是一项能够有力推动节能降耗持续运行的双赢节能技术。

　　但变频器群的大量投入带来的电能质量问题也越来越凸显，主要表现为配电系统中大量的无功功率往复、降低配电设备的使用率和大量的谐波带来的用电不稳地问题，这就要求有针对性的设备对变频器进行无功补偿和谐波治理，变频器专用滤波器应运而生。

　　2.变频器带来的电能质量问题

　　2.1.问题描述

　　2.1.1.变频器群工作时，变频器出现概率性的保护动作问题，继电保护误动作，PLC异常，仪表读数错误，特别是变频器负荷比例增加时，配电系统不稳定现象恶化趋势明显。

　　2.1.2.变频器负荷比例比较大的现场，无功补偿电容器不能有效投切，电容器容易损坏和烧毁，考核点功率因数难以持续达标。

　　2.1.3.随着变频器负荷的增加，原来正常使用的电缆、变压器温升明显，变压器噪音异常，配电设备的容量得不到充分的使用。

　　2.1.4.变频器驱动的电机发热严重，噪声尖锐，绝缘、轴承容易损坏。
随着电力电子技术的进一步发展和对变频技术在液压领域应用的进一步深入研究，其不足之处相信一定能很快被克服。

　　（1）无论截割头进行横向摆动或纵向摆动截割，为了充分发挥由截割头电机功率所决定的周向截割力PC的作用，必须使其横向摆动力TH或纵向摆动力Tq与PC保持合理的匹配关系。

　　（2）可作为设计横向或纵向摆动机构与相应液压缸有关参数的基础。

　　（3）在截割头横向或纵向摆动的过程中，截割头除受到截割阻力和运动方向的牵引（摆动）阻力作用外，尚受到与摆动方向垂直的附加垂直力或附加水平力的作用。因此，对应的升降油缸或水平摆动油缸的两腔在液压回路上必须形成闭锁，才能承受截割时的附加载荷。目前，悬臂掘进机上的这两组液压缸，均采用/O0形机能的操纵阀来实现中位封闭，可在一定程度上满足闭锁要求。但当煤岩的强度较高、截割阻力与附加阻力较大时，仅靠操纵阀的中位封闭性能是难以满足的。而且阀后液流长期处于高压，会影响滑阀的封闭性能。因此，应在液压缸的两腔油路上设置由液控单向阀构成的液压锁进行锁紧。
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Bently Nevada 3300/55 Dual Velocity Monitor 3300/55-06-01-01-05-00-00-00-00 PLC

BENTLY NEVADA 149369-01B 3500/25 KEYPHASOR MODULE D554135

BENTLY NEVADA 149369-01E 3500/25 KEYPHASOR MODULE D554137

Bently Nevada 106765-07 Vibration Sensor Probe Proximity Cable 10676507 PLC

Bently Nevada 330400 PLC Module Transducer Accelerometer Acceleration Sensor

Bently Nevada 3300/55 Dual Velocity Monitor 3300/55-06-01-01-04-00-00-00-00 PLC

BENTLY NEVADA 90201-02E DUAL RTD TEMPERATURE MONITOR 90202-01

Bently Nevada 7200 EIPP 72975-03-03-01-01-01-01 PLC Eccentricity Monitor Module

Bently Nevada 7200 RA-R Rotor Acceleration Module PLC 72317 7200RAR Bentley 20mA

BENTLY NEVADA 3500 128240-01 PROX/SEISMIC I/O MODULE (NEW)

GENELECTR BENTLY NEVADA 3300/10 RQAUS1

GENELECTR BENTLY NEVADA 330100-50-05 RQAUS1

Bently Nevada 3300/16-02-01-00-01-01-01 Dual Vibration XY/GAP Monitor 190171-161

GENELECTR BENTLY NEVADA 90225-22-02-01-01-02-02-01-01-00 RQAUS1

GENELECTR BENTLY NEVADA 21504-00-40-05-02 RQAUS1

GENELECTR BENTLY NEVADA 21500-00-32-10-02 RQAUS1

GENELECTR BENTLY NEVADA 21500-00-40-05-02 RQAUS1

GENELECTR BENTLY NEVADA 21504-00-68-05-02 RQAUS1

GENELECTR BENTLY NEVADA 79492-01 RQAUS1

GENELECTR BENTLY NEVADA 21747-040-00 RQAUS1

GENELECTR BENTLY NEVADA 21747-040-00 (7200) RQAUS1

GENELECTR BENTLY NEVADA 330180-52-05 RQAUS1

Bently Nevada 3500/15 AC Power Supply

Bently Nevada 3500/20 Rack Interface Module

Bently Nevada 3500/42M Proximitor Seismic Monitor Module PWA 140734-02 350042M

Bently Nevada 7200 Diff Exp Monitor 7200-DE 72710-XX-03-01-01-01-15 Differential

GENELECTR BENTLY NEVADA 3500/42 RQAUS1

GENELECTR BENTLY NEVADA 140734-02B RQAUS1

Bently Nevada 146031-01 TRANSIENT DAT INTERFACE I/O MODULE - New No Box

BENTLY NEVADA 3300/02 SYSTEM MONITOR TRANSIENT DATA (EMBEDDED) WITH ETHERNET

GENELECTR BENTLY NEVADA 3300/35-04-02-01-00-00 RQAUS1

GENELECTR BENTLY NEVADA 21747-080-00 RQAUS1

BENTLY NEVADA 3300/25  DUAL ACCELEROMETER  MONITOR 0-10 GS PK  RANGE  **XLNT**

GENELECTR BENTLY NEVADA PWA-90201-02-E RQAUS1

GENELECTR BENTLY NEVADA 7200-RVR RQAUS1

GENELECTR BENTLY NEVADA 21500-00-20-05-02 RQAUS1

NEW BENTLY NEVADA 330850-91-05 3300 XL 25MM PROXIMITOR SENSOR D553325

GENELECTR BENTLY NEVADA 125680-01 RQAUS1

BENTLY NEVADA AC POWER SUPPLY MODULE 3500/15 350015 127610-01 12761001

GENELECTR BENTLY NEVADA 21504-000-020-10-02 RQANS1

GENELECTR BENTLY NEVADA 19000-00-07-36-02 RQAUS1

GENELECTR BENTLY NEVADA 83729-01 RQAUS1

GENELECTR BENTLY NEVADA 19000-00-19-18-01 RQAUS1

GENELECTR BENTLY NEVADA 19000-20-34-36-02 RQAUS1

GENELECTR BENTLY NEVADA 19048-00-60-05-02 RQAUS1

GENELECTR BENTLY NEVADA 19000-00-XX-24-02 RQAUS1

GE Bently Nevada 3300 XL 8mm Proximity Transducer System W/O Proximity Probe

BENTLY NEVADA 3300/01-01-00 SYSTEM MONITOR 3300010100 BACK PLACE BROKEN

Bently Nevada Sensor 24701 Relative Probe Assembly Temperature 21048 21050-01

Bently Nevada 3300/48 Case Expansion Monitor 3300/48-05-03-01-00 PLC 82803-05

BENTLY NEVADA 3300 XL N8v VIBRATION SENSOR PROBE 330930-045-01-00 *NEW IN BOX*

BENTLY NEVADA 72101-XX-01-01-01-01-01 PC BOARD 72101XX010101010

BENTLY NEVADA 330930-045-01-00 CABLE *NEW NO BOX*

Bently Nevada 3300 Dual Vibration Monitor PLC Module 3300/15-02-01-00-01-00-01

Bently Nevada 3300 Power Supply 3300/11-01-02-00 330011010200

BENTLY NEVADA VELOMITOR  3536   P/N 190501

Bently Nevada 3300 System 6 Slot Rack 3300/05 Chassis 3300/05-23-00-00 87830-01

Bently Nevada Dual Accelerometer Monitor 3300/25-01-XX-XX-00-00-03-00 PLC 330025

BENTLY NEVADA 129966-03A *NEW NO BOX*

BENTLY NEVADA 3300 XL 5/8MM PROXIMITOR SENSOR 330180-90-00 INCLUDES 8MM PROBE

NEW BENTLY NEVADA 21000-00-00-00-0250-03-02 PROBE ASSEMBLY 210000000002500302

BENTLY NEVADA 45456 PROXIMITOR NEW

Bently Nevada 3500 3500/20 3500-20 Rack Interface Module

Bently Nevada 3500 3500-32 3500/32 4 Channel Relay Module

BENTLY NEVADA TDM SAMPLER PWA 77448-01

Bently Nevada 3300/25 330025 Dual Acceleration Monitor NIOB SAR

BENTLY NEVADA 1900/55-01-01-01-00 FAN MONITOR ***XLNT***

BENTLY NEVADA LINEAR TAPER POTENTIOMETER  77206-01 102601

GENELECTR BENTLY NEVADA 3300/03-01-00 RQAUS1

Bently Nevada 72870-01 Vibration Monitor

Bently Nevada 72870-04 Vibration Monitor

Bently Nevada 72301-02-04-02-05-01-01 PC Board

Bently Nevada 84141-01 Transducer Module

BENTLY NEVADA 24701 PROXIMITY PROBE

Bently Nevada 3500/15 AC Power Supply - best offers considered!

BENTLY NEVADA 190501 VELOMITOR CT TRANSDUCER(NEW)

Bently Nevada PWA129958-01 & PWA83657-01 for 3350/55-01-04-03-03-00-00-05-00

Bently Nevada Valve Positioner Indicator 7200 Series 72938-01-02-01-01-15

GENELECTR BENTLY NEVADA 21509-02-12-10-02 RQANS1

BENTLY NEVADA 3300/03-01-00 SYSTEM MONITOR **

GENELECTR BENTLY NEVADA 21501-00-36-10-02 RQANS2

GENELECTR BENTLY NEVADA 12240701 RQAUS1

BENTLY NEVADA 3300/12-02-20-00 3300 POWER SUPPLY

BENTLY NEVADA 3536 /190501 VELOMITOR CT TRANSDUCER(NEW)

GENELECTR BENTLY NEVADA 726902-2M RQAUS1

Bently Nevada Proximitor Probe Cable Extension Part No 2789-084

Bently Nevada 44461-07 Ctr Deck Assy 12 Slot Rack/Chassis PLC PWB49418-01 49418

GENELECTR BENTLY NEVADA 7200-RVDP-R RQAUS1

GENELECTR BENTLY NEVADA 133819-01 RQANS2

GENELECTR BENTLY NEVADA 84143-01 RQANS2

New BENTLY NEVADA Cable Splash Resistant Acceleration Accelerometer 25' 130539-2

GENELECTR BENTLY NEVADA 72870-01 RQAUS1

GENELECTR BENTLY NEVADA 330280-015-00 RQANS1

Bently Nevada 990-05-XX-02-05 Vibration Transducer

Bently Nevada 3300XL NSV 330980-50-00 Proximity Sensor

Bently Nevada 7200 XL 5/8mm Proximitor Sensor Switch 18745-04 Cheapest On

GENELECTR BENTLY NEVADA 89968-0050-02-01 RQANS2

BENTLY NEVADA 135137-01 PLC MODULE M *NEW NO BOX*

GENELECTR BENTLY NEVADA 21505-000-040-10-02 RQANS1

GENELECTR BENTLY NEVADA 21505-000-064-10-02 RQANS1

GENELECTR BENTLY NEVADA 21505-00-28-10-02 RQANS1

NEW BENTLY NEVADA 330101-00-30-10-02-00 VIBRATION PROBE 3301010030100200

GENELECTR BENTLY NEVADA 90060-02 RQAUS1

Bently Nevada 3300 Dual Vibration XY/GAP Monitor, 3300/16-03-01-03-03-00-02

GENELECTR BENTLY NEVADA 7200-DRV-R RQAUS1

Bently Nevada  Input  ASSY 78462-02

GENELECTR BENTLY NEVADA 89590-01 RQAUS1

Bently Nevada 3500/60 Temperature Monitor

Bently Nevada 21000-00-00-00-040-01-02 210000000000400102 Prob.Assem -un/OVP

GENELECTR BENTLY NEVADA 2158-02-12-05-02 RQAUS1

bently nevada  330180-50-00

NEW BENTLY NEVADA 21504-000-020-10-02 7200 SERIES PROXIMITY PROBE SENSOR D533825

GENELECTR BENTLY NEVADA 136188-01 RQAUS1

Bently Nevada 5 Metre System -- 330980-51-00 -- New

Bently Nevada Field Monitor 24V DC Power Supply Cat# 1701/10 Sealed (NIB)

NEW Bently Nevada 21508-02-12-10-02 7200 Series Proximity Sensor Pick-Up

Bently Nevada 7200 Dual Valve Positioner Indicator 7200-VPR 72937-01-02-01-01-15

Bently Nevada 7200 TACH Digital Tachometer Module PLC 72750-03-01-15-00-02

Bently-Nevada 7200 Series Proximity Probe, Extension Cable, Proximiter

BENTLY NEVADA 21508-02-12-05-02 PROXIMITY PROBE *NEW NO BOX*

Bently Nevada 3500/20 3500-20 350020 Rack Interface Module Missing Key

BENTLY NEVADA PROBE 21508-02-12-05-02 NEW

GENELECTR BENTLY NEVADA 21000-00-00-00-035-00-02 RQAUS1

Bently Nevada 7200 Power Supply 72055-01 PS S-7200-R

GENELECTR BENTLY NEVADA 9571-30 RQANS1

Bently Nevada Terminal 88286-01H GEB

Bently Nevada Terminal 88286-02A GEB

Bently Nevada 3120-300 200MV MIL PROXIMITOR

Bently Nevada 3300 XL 8mm Proximitor Sensor 330180-91-05

Bently Nevada 3300 XL 25mm Proximitor Sensor 330850-91-05 NEW

Bently Nevada 7200 8 Slot Rack 72027 H801392 Chassis PLC Cage

GENELECTR BENTLY NEVADA 330101-00-50-10-02-00 RISCN1

Bently Nevada 3300/10-01-01 Power Supply PLC 82515-01 Bentley 330010 System

GENELECTR BENTLY NEVADA 30000-00-52-18-02 RQANS2

Bently Nevada 72564-01-04-03-04-01-01-11 Monitor 7200-RVDP-R - New No Box

GENELECTR BENTLY NEVADA 21500-00-12-10-02 RQAUS1

BENTLY NEVADA 125840-02 POWER SUPPLY

BENTLY NEVADA Power Supply 3300/10-02-01-00

BENTLY NEVADA PWA 140734-02 R PROXIMITOR 3500/42M SEISMIC MONITOR PCB D553205

Bently Nevada 81546-01 Signal Input Relay Card

BENTLY NEVADA 3300XL 11mm 330780-50-00 3307805000 Proximitor Sensor -un/OVP-

GENELECTR BENTLY NEVADA 133819-01 RQAUS1

GENELECTR BENTLY NEVADA 72358-51 RQAUS1

BENTLY NEVADA 330850-X0-00 3300 XL 25MM PROXIMITOR

BENTLY NEVADA 330850-50-00 3300 XL 25MM PROXIMITOR  0.79v mm

GENELECTR BENTLY NEVADA 330101-XX-XX-10-02-00 RISCN1

GENELECTR BENTLY NEVADA 75436-01 RQAUS1

GENELECTR BENTLY NEVADA 84143-01 RQAUS1

NEW 3300/16 BENTLY NEVADA DUAL VIBRATION MONITOR 13532101

BENTLY NEVADA Dual Thrust Monitor 7200 DUTP-R 72350-05-06-01-01-01-15

BENTLY NEVADA Dual Path Monitor 7200 DP 72470-21-01-02-13-15-01-03-07-01-01-15

GENELECTR BENTLY NEVADA 72659-25 RQAUS1

Bently Nevada Case Expansion Indicator 7200 CE Series 72940-01-01-02-01-01

Bently Nevada Valve Positioner Indicator 7200 VP-R  Series 72938-01-02-01-01-01

New Bently Nevada, 12580-02, 3500 Power Supply Connector, 12584002 SAR

NEW BENTLY NEVADA 330851-04-000-020-10-00-05 3300XL 25MM PROXIMITY PROBE D553415

Bently Nevada Thrust Monitor Series 7200 TP-R 72300-02-04-01-01-01-01

Bentley Nevada Power Supply 3300/14-01-20-01

NEW BENTLY NEVADA 27482-00-50-18 PROXIMITY PROBE 27482005018

MO-1859, BENTLY NEVADA 2100/11 RACKMATE

Bently Nevada Interface Module Rack PN: 125768-01

BENTLY NEVADA 149992-01 3500/33 16-CHANNEL RELAY OUTPUT MODULE D554166

BENTLY NEVADA 146031-01  TRANSIENT DATA INTERFACE I/O MODULE 14603101 146031 01

Bently Nevada 9000 Dual RTD Temperature Monitor 90199 -22-02-06-04-02-01-03-04

BENNTLY NEVADA  330104-00-02-10-02-00

NEW BENTLY NEVADA 24654-03 HIGH TEMP 25MM PROXIMITOR 2465403

BENTLY NEVADA DUAL VELOCITY MONITOR

Bently Nevada 2155100-00-03-00-01-00-00-00-00-00-00 Transient Data Interface

BENTLY NEVADA 3300 XL , 11 MM , PROXIMITOR SENSOR , P/N 330780-91-00 , NEW

NIB Bently Nevada Probe 330130-085-00-00

Bently Nevada 330101-00-16-50-02-00, 3300 XL 8mm, Proximity Sensor Probe

Bently Nevada 72059-01 Keyphaor Board

Bently Nevada Valve Positioner Indicator 7200 Series 72938-01

GENELECTR BENTLY NEVADA 21747-045-00 RQANS1

BENTLY NEVADA 3300/55-03-01-05-05-00-00-01-00 DUAL VELOCITY Ships Today

GENELECTR BENTLY NEVADA 330101-00-25-10-02-05 RQANS1

Bently Nevada 3300 Series Differential Expansion Monitor 3300/46 82803-01 V

Bently Nevada Probe 19048-00-20-10-02

GENELECTR BENTLY NEVADA 330101-05-26-10-02-05 RISCN1

GENELECTR BENTLY NEVADA 330101-00-48-10-02-05 RISCN1

GENELECTR BENTLY NEVADA 37506-A-01 RQAUS1

GENELECTR BENTLY NEVADA 330101-00-20-10-02-05 RQAUS1

Bently Nevada 3300 Series Eccentricity Monitor 3300/40 PWA 88796-01

GENELECTR BENTLY NEVADA 21505-00-60-10-02 RQAUS1

BENTLY NEVADA 3300 XL 5/8 mm PROXIMITY SENSOR 330180-91-00 , 7.87 V/mm

Bently Nevada Dual Velocity Monitor 3300/55-01-04-02-02-00-00-05-01 PWA129958-02

GENELECTR BENTLY NEVADA RVXYII-72852-01K RQAUS1