- 型号:Pacific 3262RF/AD6
- 数量:10
- 制造商: 厦门兴锐达自动化设备有限公司
- 有效期:2019/2/1 0:00:00
Taylor-Wharton 10 Liter Liquid Nitrogen Cryogenic Dewar Cap
Gast Regenair Blower Model R4P315A
Gast Model R3305A-1
Gast Model 2067-V103
Aerzen GMb 16.13 HV Roots Blower Vacuum Pump 11,700 M3/Hr. Excellent Condition
Noyes OFL-100HR
Pacific 3262RF/AD6
Grandville-Phillips Model 260015
Taylor-Wharton 5 Liter Liquid Nitrogen Transport Dewar Cap
LMQ II Infinity Solutions Integrated Folder/Sealer Paper
Neutron REM 500 Servey
Taylor-Wharton 35-50
Laser Diode Aray SDL 34-00332
HPS KF40 Shut-Off MKS
EMG 97 Lambda Physics Power Supply Hewlett Packard
ARC Monochromator Spectrometer Parts/Rebuild Spectra Physics
MKS Valve KF40 Shut-Off
MDC KIV-200P Valve KF50 Shut-Off
MDC KIV-150-P High Vacuum Research Chamber InLine Valve KF40 Shut-Off
Marking Burning Station Nd:Yag Optics Lambda Spectra-Physics
Pacific 3262RF/AD6
到底采用何种方法,应根据不同的情况作出不同的分析。笔者认为,在有5用变压器的前提下,应尽量采用全压起动。这在农村的排灌事业是完全能实现的。
2分析及算例2.1全压起动和降压起动时电动机的发热分析设电动机的额定电流为全压起动时的电流为发热量为心起动过程需要时间为降压起动时的电流发热量为,起动过程需要时间为t.为简化计算,设电阻R为常数其实是随着温度的变化而改变的,根据电流热效应的公式有当降压起动采用0.6,时=0.6将其代人4式得可,只有当起动电甩为6起动时间为10,时,发热情况才好点,但这时的起动力矩为原先的36起动力矩与所加电压的平方成正比。实践证明,起动电压越低,所需就会超过3.由此可,从电动机发热角度来看,全压起动对电动机本身而言反而存利。
2.2校核全压起动时母线的,余电压降3电源为=,时大电网,不经常起动的电动机,起动时允许的电压降为20对额定电压为380220.的带动水泵的电动机来说,可允许剩余电压降为601校核公式为变压器的阻抗电压,变压器的额定容量,I,起动时的,大电流,为本台电动机的起动电流和其余电动机额定电流的总和电动机,变器的阻抗电压百分数=6.05,电动机的额定电流7,=3,起动电流倍数为4.2,4台正常运行,1台起动。则可,用全压起动。
2.3按变压器的过载能力进行分析宰外配电装置,变器过负荷容许延续的时间列尸1.
从1可压1变压器过负荷容许延续时间存定潜力的,当然是对短时间电动机自起动时的过载而言。
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Key Valve Tech High Vacuum Research Chamber Inline Valve with KF40-KF25
High Vacuum Research Chamber ISO 100K & ISO 63F Adapter Flange K25 Varian UHV
High Vacuum K25 UHV
High Vacuum KF40 Shut-Off
Edwards FL20K Forline Inlet Trap KF25 Rotary Vane Pumps Alcatel
Ortec Detector Model 210" AS-IS HP
Pacific 3262RF/AD6
NOMOS BAT SXi Ultrasound Localization System
AEROVOX 22,000 VDC High Energy Discharge Capacitor (8) Tesla Coil AeroStor
Varian 400 ASA Vacuum Research Chamber Gate Valve MDC H.V.A.
Briskheat Percentage Mantel Controller Thermolyne Glas-Col
CVC Vacuum Research Chamber 4 Inch ASA Gate Valve MDC H.V.A.
Canon Anelva Ion Pump Control Unit PIC-060 NP
Bertan 303 High Voltage DC Nim Bin Power Supply Module 0-3000V Ortec Tennelec
MKS High KF50 Shut-Off
MKS High Vacuum Research Chamber Inline Valve KF40 Shut-Off
Pacific 3262RF/AD6
MKS High Vacuum Research Chamber 90 Degree Right Angel Valve KF50 Shut-Off MDC
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