高速鐵路車網(wǎng)耦合誘發(fā)的暫態(tài)諧振過電壓仿真研究研究外文翻譯、中英對照、英漢互譯

1、overvoltage research status mechanism of ferromagnetic resonance at home and abroad has been exhaustive research, the main reason is when the voltage increases, (then, of closing the persistent failure resection can cause), pts core saturation, the inductive reactance xmline-to-ground capacitance or

2、 circuit breaker equalizing the capacitance of the capacitor and capacitor equipment close to inspiresince a resonant frequency. in the power system to determine ferromagnetic resonance occurs in any case will preventand analysis play a very important role. opinion at home and abroad in accordance w

3、ith the above results of ferromagnetic resonance over-voltage are generally taken to prevent and eliminatemethods, prevention and to eliminate ferroresonance over-voltage is generally considered from two aspects of the running operation, equipment. from running operation considerations during operat

4、ion ferroresonance over-voltage, the operation of the equipment or line road re ored to the state before the operation, and then re-operate. the bus charging power shininghub circuit breaker, and then close thentransformer or voltage transformer and inductor device on the bus. ferromagnetic resonanc

5、e occurs in the operation, the temporary investment ofinto the arc suppression coil or specified in advance some of the lines or equipment, such as shunt capacitor banks or standby line. from the deviceconsiderations, (1) in the star connection voltage transformer primary winding neutral point and g

6、round installation of harmonic elimination, such as:-6-35 type lxq (resistor r), r in series by a sic non-linear resistor and a linear resistor (6 7k), thissample can directly absorb vibration energy, to prevent resonance occurs, this damping method is particularly suitable for large capacitance ong

7、rid; (2) the original electromagnetic voltage transformer triangular openings at both ends of the winding (secondary side) access harmonic elimination installedset, such as: 10kv and 35kv voltage transformer, respectively, then wnx-ii / 10, and wnx of-ii / 60 type microelectronicsbrain multi-functio

8、n harmonic elimination, which can eliminate the fundamental resonance, but also to eliminate high-order harmonic and sub-harmonic resonance, this measures particularly suitable for small-to-ground capacitance grid; (3) between the tv and high-voltage voltage transformer neutral point and ground stri

9、ngthe phase voltage transformer tv0 of orders, tv0 tv same model, ground signal voltage from tv0 secondary acquisition. on the one hand, the general external excitation can not make the tv into the saturated zone; the other hand tv0 high voltage winding dc resistance of approximately10k, the resonan

10、t strong damping effect, a measure that is suitable for a variety of distribution networks; (4) 10 to 35 kv powerthe pressure transformer used in all the harmonic elimination voltage transformer. more than the prevention and elimination of ferroresonance over-voltage methods and measures, to some ex

11、tent, the system can eliminatethe ferromagnetic resonance over-voltage, but not well determine the type of ferromagnetic resonance, measures for eliminationthe process tends to cause unnecessary waste, and may even expand the occurrence of ferroresonance over-voltage. at the present stageall areas i

12、n research, how to determine by calculation or simulation power system ferroresonance over-voltage class type, the final choice harmonic elimination measures.is still in a research point of view, whether domestic or foreign, for the substation ferromagnetic overvoltage simulation analysisstudy stage

13、, there is little research institutions or units of the entire substation simulation, and most of them are just pinan interval of substation, an outlet to the simulation, the simulation results and the actual results have some access it is difficult to be corrected; basically use a lumped parameter

14、model from the model, and use the set parameters in model of the entire substation ferroresonance over-voltage tends to ignore the distributed capacitance and distributed inductance and other . the items distributed parameter influence on the results. 國內(nèi)外對鐵磁諧振的機(jī)理已有詳盡的研究，其主要原因是當(dāng)電壓升高時，（接地、不同期合閘，持續(xù)性故障的

15、切除等，均可引起），pt的鐵芯飽和，其感抗xm下降，而與線路對地電容或斷路器均壓電容等電容型設(shè)備的容抗接近時，即可激發(fā)起某一頻率下的諧振。在電力系統(tǒng)中，判斷在任何情況下會發(fā)生鐵磁諧振將對預(yù)防和分析起到十分重要的作用。 按照上面得出的觀點(diǎn)國內(nèi)外對于鐵磁諧振過電壓一般都是采取預(yù)防和消除的方法，預(yù)防和消除鐵磁諧振過電壓一般從運(yùn)行操作、設(shè)備兩方面考慮。從運(yùn)行操作方面考慮，如果在操作過程中發(fā)生鐵磁諧振過電壓，可立即把操作過的設(shè)備或者線路恢復(fù)到操作前狀態(tài)，然后重新進(jìn)行操作。母線充電時，先合電源斷路器，再合接在母線上的變壓器或電壓互感器等電感設(shè)備。在運(yùn)行中發(fā)生鐵磁諧振時，可臨時投入消弧線圈或事先規(guī)定的某些線

16、路或設(shè)備，如并聯(lián)電容器組或備用線路等。從設(shè)備方面考慮，在電壓互感器一次繞組星形接線的中性點(diǎn)與地間加裝消諧器如：lxq-6-35型（電阻r），r由sic非線性電阻和線性電阻（67k）串聯(lián)組成，這樣可直接吸收振蕩能量，阻止諧振發(fā)生，這種阻尼方式特別適合于對地電容較大的電網(wǎng)；在原有的電磁式電壓互感器的開口三角繞組兩端（即二次側(cè)）接入消諧裝置，如：在10kv和35kv電壓互感器分別接wnx/10和wnx/60型微電腦多功能消諧器，這樣可消除基波諧振，又可消除高次諧波和分次諧波諧振，這一措施特別適合對地電容較小的電網(wǎng)；在電壓互感器tv的高壓中性點(diǎn)與地之間串接單相電壓互感器tv0，tv0與tv同型號，接地信號電壓可從tv0二次取得。一方面，一般外部激發(fā)不能使tv進(jìn)入飽和區(qū)；另一方面tv0高壓繞組的直流電阻約為10k，對諧振有強(qiáng)烈的阻尼作用，這一措施適合于各種配電網(wǎng)；1035kv電壓互感器全部采用消諧型電壓互感器。 以上預(yù)防和消除鐵磁諧振過電壓的方法和措施，在一定程度上可以消除系統(tǒng)中的鐵磁諧振過電壓，但由于不能很好的判斷出鐵磁諧振的類型，在采用消諧措施的過程中往往會造成不必要