1、矿用风机运用新型设施故障剖析Mine fan fault analysis using the new facilities1 系统的构成及初期投资分析Composition and initial investment analysis 1 system串调装置一般由配电装置、变流装置、调节保护系统、快开、电抗器、逆变变压器、频敏变阻器等部分组成。配电装置、快开、电抗器、频敏变阻器的参数依电动机参数而定，配电装置依电动机容量而定，快开、电抗器、频敏变阻器依电动机转子电流而定，调节保护系统依串调系统的控制方案而定。所以，影响串调装置造价的主要因素是变流装置和逆变变压器。String trans
2、fer device generally consists of power distribution unit, variable flow device, adjusting the protection system, quick opening, reactor, transformer, inverter frequency sensitive rheostat components. The distribution device, quick opening, reactor, frequency sensitive rheostat parameters depend on t
3、he motor parameter, power distribution device depends on the motor capacity, quick opening, reactor, frequency sensitive rheostat in the rotor of the motor current and decide, regulating protection system according to the control scheme of cascade control system depending on. Therefore, the main fac
4、tors influencing on the cost of the device is the converter and inverter transformer.变流装置分为整流和逆变两部分。整流部分有整流二极管组成，其参数由电动机转子参数而定。http:/ flow device is divided into two parts of rectifier and inverter. The rectifier part of rectifier diode, the parameters of the motor rotor parameter.逆变部分有可控硅元件组成，可控硅元件
5、电流值由电动机转子电流而定。随着串调系统调速范围加大，要求逆变电压提高（电流值不变）.由此可见，加大调速范围后变流装置仅需提高可控硅元件的耐压值。影响可控硅元件造价的主要因素是元件的电流值，且大功率可控硅元件耐压值一般在 1000V 以上，适当加大系统调速范围后可控硅元件的耐压值一般不会升级。随着调速范围的加大，要求逆变电压提高，逆变变压器(试验变压器的型号选择) 二次侧电压提高，逆变变压器的容量会有所增大。因变压器的造价在串调系统中占的比重较小，因而适当加大调速范围后对串调系统的造价影响不大。如在车集矿井北一风井（扇风机主电机容量为 400kW）施工图设计中加大了调速范围，调速范围由 590
6、545r/min 加在到 590440r/min.加大调速范围后，仅逆变变压器容量就由原来的 60kVA 增大到160kVA.可控硅元件耐压不用提高，串调设备（总造价 45 万元）增加投资 17 万元。The inverter is composed of thyristors, thyristor current value by the motor rotor current and. With the cascade speed adjusting system increase scope, requirements to improve the inverter voltage (c
7、urrent value unchanged). Thus, increased speed range converter only increasing the withstand voltage thyristor values. The main factors affecting the silicon http:/ element cost is the element of the current value, and large power SCR voltage values are generally in more than 1000V, increasing the s
8、peed range of system voltage thyristor values generally do not upgrade. With the increase of speed range requirements, the inverter voltage increase, the inverter transformer (test transformer model selection) two secondary side voltage increases, the inverter transformer capacity will be increased.
9、 For a small proportion of the cost in the cascade control system for less cost, influence on the cascade control system and thus increase the speed range. As in Cheji mine north air shaft (fan main motor capacity of 400kW) in the design of construction increased the speed range, speed range from 59
10、0545r/min to 590440r/min. in the increased speed range, only the inverse transformer capacity from the original 60kVA increases to 160kVA. silicon controlled element pressure without raising, string transfer equipment (total cost 450000 yuan) to increase the investment of 170000 yuan.2 加大调速范围后系统的运行分
11、析Analysis of 2 increased speed range of system operation21 系统效率21 system efficiency加大调速范围后因逆变变压器容量的增大，变压器的损耗会稍有增加，因变压器运行效率高，变压器容量的增加基本不影响系统的运行效率。http:/ the increased speed range by inverse transformer capacity, the loss of transformer will be slightly increased, due to transformer operation, high ef
12、ficiency, increase the transformer capacity basically does not affect the efficiency of the system.22 系统功率因数22 the system power factor影响系统功率因数的主要因素有电动机、变压器本身的功率因数，但更重要的是变流装置的影响。随着矿井对风量、负压要求的提高，逆变角的增大，逆变电流滞后电压角度增大（电流滞后角度即为逆变控制角）.又因系统加大调速范围提高了逆变变压器二次侧电压，使得逆变侧回馈电网的无功容量增加（增加的比例值即变压器容量增加的比例）.系统的功率因数会有所下降
13、，但随着新技术的成熟应用，如在中小容量串调系统中采用斩波技术，随着风机后期对转速要求的提高，电机转子回路的电流大部分可通过斩波器形成回路，减小逆变回路电流，从而减小逆变回电网的无功容量，使系统功率因数明显提高；在大容量系统中采用顺序控制也可有效地提高系统的功率因数。The main factors influencing the system power factor of the power factor of the motor, transformer itself, but more important is the impact of the converter. Along wit
14、h the on air, negative pressure requirements increase, increasing the angle inverter, inverter current hysteresis and voltage angle increases (current delay angle is inverter control angle). Because the http:/ increased speed range is increased by two times the inverter transformer voltage, the inve
15、rter power regeneration without power capacity increase (increased the proportion of the value of transformer the capacity to increase the proportion of). The power factor of the system will decrease, but with the mature application of new technology, such as in the middle and small capacity on Regu
16、lating System Based on chopper technology, along with the fan later on speed requirements increase, electric current of rotor loop most forms the loop through the chopper, inverter circuit current decreases, no power capacity so as to reduce inverter back network, make the system power factor is imp
17、roved; in the large capacity system used in sequence control can effectively improve system power factor.由以上分析可以看出，若在矿井通风系统设计选型时，依据风机的使用情况适当加大串调系统的调速范围，对通风系统的初期投资影响不大。对通风系统的主要影响是后期运行的无功容量增大，但可以通过新技术的应用或增加无功补偿容量得到解决。所以设计选型应依据矿井具体使用情况，合理选用风机的调速范围，减少矿井建设期间和投产初期风机运行的电能损耗对提高风机运行效率具有很重要的意义。From the above
18、analysis we can see that, if in the design and selection of mine ventilation system, based on the speed range of cascade control system properly increasing the use of fan on the initial investment, little http:/ on ventilation system. The main influence on the ventilation system is idle capacity inc
19、reases late run, but can through the application of new technology or increase the wattless compensation capacity is solved. So the design should be based on the specific use, speed range, reasonable selection of fan, reduce mine construction period and the early stage of production operation of the wind turbine power loss has very important significance to improve the service efficiency of the fan.
