耐压击穿装置的容量指标研究

根据影响绝缘材料击穿的主要因素,本文着重阐述了交流耐压击穿装置的容量指标问题,在确定耐压击穿装置的容量时,要考虑试件在击穿过程可能产生的最大击穿电流值。对于某种绝缘介质或构件,合理选定耐压击穿装置的容量对正确进行试验是很重要的。     

耐压击穿装置的容量指标研究

根据影响绝缘材料击穿的主要因素 ,本文着重阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时 ,要考虑试件在击穿过程可能产生的最大击穿电流值。对于某种绝缘介质或构件 ,合理选定耐压击穿装置的容量对正确进行试验是很重要的。     

耐压击穿装置的容量指标

根据影响介质击穿的主要因素，本文着阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时，不仅要考虑到被样件两极间的等效电容值，同时还要估计到试件在击穿过程可能产生的最大击穿电流值，对于某种绝缘材料或构件，合理选用耐压击穿装置的容量对正确进行试验是很重要的。     

耐压击穿装置的容量指标

根据影响介质击穿的主要因素，本文着重阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时，不仅要考虑到被试样件两极间等效电容值，同时还要估计到试件在击穿过程可能产生的最大击穿电流值，对于某种绝缘材料或构件，合理选用耐压击穿装置的容量对正确进行试验是很重要的。     

耐压击穿装置的容量指标问题

根据影响绝缘材料击穿的主要因素 ,着重阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时 ,不仅要考虑到试样两极之间的等效电容 ,同时还要估计到试样在击穿过程可能产生的最大击穿电流值。对于某种绝缘材料或构件 ,合理选定击穿装置的容量对正确进行试验是很重要的     

耐压击穿装置的容量指标

根据影响介质击穿的个人因素，文章着重阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时，不仅要考虑到被试样件两极间的等效电容值，同时还要估计到试件在击穿过程过程可能产生的最大击穿电流值，对于某种绝缘材料或构件，合理选用耐压击穿装置的容量对正确进行试验是很重要的。     

耐压击穿装置容量指标

根据影响绝缘材料击穿的主要因素,文中阐述交流耐压击穿装置的容量指标,在确定耐压击穿装置容量时,要考虑被试样件在两级间的等效电容值,同时还要估计到样件在击穿过程可能发生的最大击穿电流值。对于某种绝缘材料或构件,合理选定击穿装置的容量对正确进行试验是很重要的．     

耐压击穿装置的容量

着重阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时，不仅要考虑到被试样件在两电极之间的等效电容值，同时还要估计到样件在击穿过程可能产生的最大击穿电流值。     

耐压试验装置的容量指标

根据影响绝缘介质击穿的主要因素，本文着重阐述了交流耐压试验装置的容量指标问题。在确定耐压试验装置的容量时，不仅要考虑到试样件两极之间的等效电容值，同时还要估计到试样在击穿过程可能产生的最大击穿电流值。对于某种绝缘材料或构件，合理选用耐压试验装置的容量对正确进行试验是很重要的。     

电能表耐压装置反冲电压的抑制方法

电能表在进行耐压试验时,如发生耐压击穿,耐压装置输出电压会产生较高的反冲电压,导致多表位耐压装置上的其他电能表击穿或损坏。通过对反冲电压产生原理的分析,设计出一种反冲电压抑制的方法,可极大的降低耐压试验的误检和保护电能表不受损坏。     

Sparking, electrical discharge, and heating in synchronous andinduction machines: can it be controlled?

It is impossible to eliminate all occurrences of sparking and localized heating from the interior of electric machines during the 20-40 years that they are normally in service. One can minimize the probability of sparking and localized heating by exercising precautions which will eliminate or minimize the sources of these conditions in AC machines. Most new machines have a low probability of sparking, but some design steps can be taken which condition the machine as a sparking type or a nonsparking type. This paper discusses the aspects of arcing between rotor and stator in the air gap, sparking between rotor parts, sparking between frame components, sparking due to broken or open bars and endrings, and surface discharge on the stator winding. Also discussed is what action, if any, can be taken in design, application, and maintenance to eliminate or control these problems     

铝电解电容器用电解液的烧煮工艺研究

以现有生产工艺为基础,通过调整配方,改进烧煮工艺,用正交试验研究中高压铝电解电容器用工作电解液.结果表明,通过添加不同分子量的高分子聚合物PVA,可以提高电解液的闪火电压,降低闪火时间.当以乙二醇为主溶剂,癸二酸铵、十二双酸铵、壬二酸氢铵、硼酸等为主溶质,添加1.15％（质量百分数）的高分子聚合物时,32s初闪电压为428 V,电解液64s时闪火电压达到500 V,制作的电容器（400 V、6.8μF）漏电流为13.5μA,损耗0.05,耐纹波寿命达到8kh.     

大型水轮发电机集电环装置环面损蚀探究

对大型水轮发电机组集电环装置环面损蚀现象进行分析,指出其主要由机械磨损、电火花腐蚀和电化学腐蚀所致。对此提出了防治和减缓集电环环面损蚀的措施：① 选择天然石墨碳刷;② 及时消除碳刷打火现象;③ 加强停运保护;④ 改善集电环室运行环境;⑤ 保持集电环环面平整。这些措施在葛洲坝水电站125 MW机组得到应用,水轮发电机滑环运行状况有所改善,因集电环环面损蚀所引起的打火及过热情况明显减少。     

Electrostatic Precipitator Voltage Control Using Silicon-Controlled Rectifiers

A new electrical control for electrostatic precipitators is discussed. The control uses silicon-controlled rectifiers (SCR's) and analog electronic networks for rapid response to sparking and changing gas and dust conditions.     

矿用防爆型照明综保装置

论述了用于井下巷道工作面等处照明开关的防爆性。阐明了如何使用无触点开关来防止电器线路及灯具等短路产生的火花，并给出了实验和实用参数。     

Risk of ignition due to transition currents in medium voltagemotors for classified locations

In 1984, during commissioning of a two-pole 13.2 kV motor driving a compressor in a chemical plant, arcing and sparking were observed at the joints of the enclosure. Later two motor explosions, which occurred on offshore platforms, were presumably ignited by arcing and sparking at the joints of the enclosures. This information instigated further investigations. The research work and measurements, which basically apply to all 1000 r/min and above machines of multisection enclosure design are discussed. In the presence of a flammable vapor, the current transfers at enclosure joints are a potential ignition source. These eddy currents in the enclosure are created by stray fields emerging from the active part of the motor consisting of stator and rotor. On the basis of the investigations, necessary remedial measures for large high-speed (1000 r/min and above) motors are described     

The Sparking Characteristics of Needle-To-Plane Coronas

The sparking voltage (Vs) and maximum presparking corona current (Imax) of needle-to-plane coronas have been measured as independent functions of polarity, tip radius (r), and needle-to-plane spacing (S). For a negative needle, Vs and Imax increase with S but are independent of r. For positive polarity, Vs and Imax increase with both S and r. Thus to increase the corona current while avoiding a spark, one should increase the spacing and voltage. At large spacings, Imax is appreciably greater for negative polarity than for positive. Analysis of the data reveals that for negative polarity the maximum presparking current may be written in the approximate form Imax?Vs(Vs-VO)S-2 where VO is the corona threshold voltage. This is an extrapolation of a relationship previously obtained for Trichel pulse corona. The analysis shows that the transition from negative corona to sparking occurs when the linear space charge density in the gap reaches a critical value Qs/S ?10-10 coul/mm, where Qs is the total space charge in the gap just before sparking occurs. It is shown that this condition amounts to spatial overlap of the multiple ion clouds in the gap, thereby creating a continuous ionized channel between the electrodes.     

增安型无刷励磁同步电动机采用发电机突然短路法进行无火花试验的探讨

讨论增安型无刷励磁同步电动机采用电机惰行时,发电机突然短路法代替电动机空满压起动无火花试验的可行性。     

平行四边形水平宽度和转角参数的应用

本文研究测量局部放电特性的平行四边形方法,发现平行四边形的水平宽度与绝缘系统所含气隙的放电电压和残余电压有关,提出了一种确定气隙放电电压和残余电压的方法——平行四边形两次测量法。从而认定平行四边形转角表征的电压值和电荷转移量也是平行四边形法中的重要参数,利用这些参数可以估计放电特性。此外,本文分析证明了气隙试样中平行四边形图形特征。     

Characteristics of a fast rise time power supply for a pulsedplasma reactor for chemical vapor destruction

Rotating spark gap devices for switching high voltage direct current (DC) into a corona plasma reactor can achieve pulse rise times in the range of tens of nanoseconds. The fast rise times lead to vigorous plasma generation without sparking at instantaneous applied voltages higher than can be obtained with DC. The resulting energetic plasma is effective for destroying a variety of molecules. The spark gap circuit configuration plays an important role in the effectiveness of the plasma generation. A single-gap circuit is effective for generating moderate peak voltages, but is limited by a multiple sparking phenomenon. A double-gap circuit can achieve equal peak voltages with every spark, but with a reduced number of pulses, compared to the single gap. Both configurations have an upper voltage imposed by the changing impedance of the reactor as voltage and frequency are varied. The pulse characteristics are reported for both types of circuits. The general performance of the reactors for destruction of some compounds with both circuits is also reported