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To improve the stability of Arcjet discharge plasma in low current and high voltage mode, research on the demand of output characteristics of Arcjet Power Conditioning Unit was conducted. In this paper, based on PWM invertors and current mode control, using MOSFET as the main power device, an Arcjet Power Conditioning Unit was developed. Through adding a closed loop feedback circuit of output voltage, it can make the output characteristics of PCU be positive resistance to ensure the stability of Arcjet discharge plasma. The experiment indicates that this PCU can make Arcjet engine work at high voltage mode (100 V, 10 A) and ensure the stability of arcjet discharge plasma. Finally, it provides the experimental data of Arcjet when working.

为了解决小电流、高电压下电弧火箭等离子体的稳定性问题，研究了电弧火箭发动机对电源调理单元的输出特性要求，基于逆变电源脉宽调制技术与峰值电流型控制原理，以MOSFET为主功率器件，研制了一台电弧火箭电源调理单元，给出了Arcjet工作时的实验数据，通过增加PCU输出电压的闭环反馈电路，可以使PCU的输出外特性呈现正阻性，保证电弧的稳定燃烧，实验结果表明，该电源调理单元能使电弧火箭发动机达到高电压工作模式(100V， 10A)，保持电弧工作的稳定性。

It is also a key component that the management of accumulator in P-V system. The plan of the management of accumulator is enacted in the paper, which joints the charge and discharge characteristic of the accumulator together with P-V system's uniqueness, it takes the measures of low-voltage protection、over-voltage protection and the temperature compensation at the point of over-voltage protection.

光伏系统中对蓄电池的管理也是一个关键部分，本文结合蓄电池的充、放电特性以及光伏系统的独特性，制定了蓄电池的管理方案，采取了欠压保护、过压保护以及过压保护点的温度补偿。

The influence of impulse voltage waveshape on particle-initiated breakdown voltage of a GIS system in SF6 and SF6/Air mixtures is reported. The results are compared with the characteristics of air gaps. For the SF6 gaps, breakdown voltage depends on wave-front duration but almost independs on wavetail duration. For the gaps in SF6/Air mixtures, the influence of impulse waveshape also depends on SF6 contents and electrical field non-uniformity

作者研究比较了正极性冲击电压波形对SF_6、空气、SF_6/空气的 GIS 电极装置由固定导电微粒引发的击穿电压的影响，结果表明：SF_6间隙的击穿电压受冲击电压波前时间长短的影响较大，而与波长的关系不大，当采用SF_6/空气混合气体时，则这种影响随SF_6含量增大而愈明显，并与电场不均匀程度有关。

In order to solve this problem, a control strategy is developed. A control algorithm to suppress negative sequence current through ASVG caused by slight asymmetry of system is also developed based on the modeling method in function of switchings and the definition of instantaneous negative sequence voltage. The ASVG can generate a negative sequence voltage component against that in the system while it generating positive sequence voltage with this algorithm.

在系统轻度不对称时，本文提出了通过控制ASVG触发脉冲使其产生与系统电压负序分量大小和相角完全相同的负序电压以抵消系统电压负序分量，从而抑制ASVG负序电流的方法，并用&开关函数&建模法给出了具体的控制算法。

The following functions can be realized: Measuerment:the effective values of three phase current and voltage, power frequency, active power, reactive power, power factor etc. Motor control: direct starting, converse starting, star and triangle starting, self-starting. Protection:thermal overload protection, current leakage protection, open-phase protection, three-phase unbalance protection, over voltage protection, loss voltage protection, low load protection and fault warning and fault dates memory. Communication: communication of the computer in control room and the microcomputer monitor in the spots is realized by the interface of RS-485. The motor is not only controlled in the spots but also in control room. The dates, information and some functions are shared by the spots and control room too.

该电动机监控器以80C196KC单片机为核心，通过采样三相电流﹑电压信号来实现以下功能：三相电流﹑电压有效值，电网频率，有功功率，无功功率及功率因数等的测量；对电动机实现直接、正反转、星三角及自起动控制；对电动机实现热过载、漏电、断相、三相不平衡、过压、欠压及轻载保护，对故障进行报警及数据记忆；通过RS-485串行接口与中央控制室计算机实现通信功能，对电动机既可本地，也可远程控制；实现控制现场与控制室之间数据、信息、功能共享。

2KV, and the critical disruptive discharge voltage of low voltage transformer, filter and relay is between 3. 1 to 10.2kV. The lightning current withstand characteristics of electrical lines in low voltage system is also tested.

研究了全封闭和带丝网玻璃窗后的金属板屏蔽小室的稳态屏蔽效能和暂态屏蔽效能，比较了合金丝网玻璃窗对金属板屏蔽室屏蔽效能的影响。

Digital Language nuclear phase meter, intelligent dielectric loss test, instrument megger, frequency series resonance test device, grounding resistance tester, transformer load switch tester, the nuclear-phase high-pressure device, vacuum oil filter, clamp grounding resistance instrument, stray current detector, transformer features an integrated tester, cable fault tester, DC resistance tester, digital relay protection tester, automatic transformation ratio tester, relay protection tester, vacuum tester, Loop resistance tester, wireless high-pressure phase of nuclear device, active transformer capacity tester, insulation oil dielectric strength tester, high voltage switch mechanical properties tester, intelligent switching characteristics tester, light-up-flow devices, wireless instrument of nuclear phase, oxidation Zinc arrester tester, high voltage test transformer, DC high-voltage generator, lightning counter checkers, inductive load DC resistance tester, dielectric strength of insulating oil automatic tester, relay protection test chamber, multi-function test bed, IF DC - Generators

数显语言核相仪，智能化介质损耗测试，仪兆欧表，变频串联谐振试验装置，接地电阻测试仪，变压器有载开关测试仪，高压核相仪，真空滤油机，钳形接地电阻仪，杂散电流测定仪，互感器特性综合测试仪，电缆故障测试仪，直流电阻测试仪，微机继电保护测试仪，全自动变比测试仪，继电保护测试仪，真空度测试仪，回路电阻测试仪，高压无线核相仪，有源变压器容量测试仪，绝缘油介电强度测定仪，高压开关机械特性测试仪，智能开关特性测试仪，轻型升流器，无线核相仪，氧化锌避雷器测试仪，高压试验变压器，直流高压发生器，雷击计数器校验器，感性负载直流电阻测试仪，绝缘油介电强度全自动测试仪，继电保护试验箱，多功能测试台，中频直流发生器

Company's products are as follows: 1, AC-DC transformer test, the control box and console, high-voltage direct current generator, high-current generator, the third-harmonic power generator , AC-DC high-pressure measuring device, dry-type isolation transformers. 2, MOA tester, relay calibrator, DC Resistance Tester, insulating oil dielectric strength tester, dielectric loss tester, insulating oil dielectric loss tester, transformers containing a switch tester. 3, clamp-type ground resistance tester, grounding resistance table, insulation resistance tester, switch mechanical properties tester, loop resistance tester, vacuum tester. 4, cable fault Tester (notebook computers, LCD, kinescope three shows), sentinel-synchronous digital, cable identification device, try扎cable, high-voltage integrated devices, underground pipeline detector, cable detector, high pressure Cable Detector, DC Bridge, DC arms Bridge, the PSA than the bridge. 5, the company also several well-known domestic and foreign agents company's products, for example: Japan has legislation (Xinhua shake table 3121,3122,3123,3125), Japan with 000 (high-voltage clamp-type table HCL1000D, HLC9000, HLC5000, etc.), cable Altimeter instrument, laser range finder, non-metallic pipeline positioning system, and so on. N:-yuan power equipment

公司产品如下：1、交直流试验变压器、控制箱及控制台、直流高压发生器、大电流发生器、三倍频电源发生器、交直流高压测量装置、干式隔离变压器。2、氧化锌避雷器测试仪、继电保护校验仪、直流电阻测试仪、绝缘油介电强度测试仪、介质损耗测试仪、绝缘油介质损耗测试仪、变压器有载开关测试仪。3、钳型接地电阻测试仪、接地电阻表、绝缘电阻测试仪、开关机械特性测试仪、回路电阻测试仪、真空度测试仪。4、电缆故障测试仪（笔记本电脑、液晶、显象管三种显示）、数显同步定点仪、电缆识别仪、电缆试扎器、高压一体化装置、地下管线探测仪、电缆探伤仪、高压电缆探伤仪、直流电桥、直流双臂电桥、变压比电桥。5、本公司还代理国内外多家知名公司的产品例如：日本共立（电动摇表3121、3122、3123、3125等）、日本万用（高压钳型表HCL1000D、HLC9000、HLC5000等）、线缆测高仪、激光测距仪、非金属管线定位系统等等。

After years of efforts and the needs of users, the company currently has products are mainly 6 ~ 10kV of KYN28A-12 sheathed in metal cabinets home, XGN -12 ring counters Nets, CBW-1-type box-type substation, GGD AC Low Voltage Distribution counters, GCK low-voltage switch cabinet drawers, GBD due to set-type low-voltage switchgear, ZXL§Distribution Cabinet, ZXJ metering box as well as the PZ30, such as power, lighting distribution box, the product also involves the control of industrial automation power distribution cabinet type PLC.

经过多年来的努力和用户的需要，公司目前产品主要有6~10kV的KYN28A-12金属铠装中置柜、XGN□-12环网柜、CBW-1型箱式变电站、GGD低压交流配电柜、GCK低压抽屉式开关柜、GBD低压因定式开关柜、ZXL户内外配电柜、ZXJ计量箱以及PZ30等动力、照明配电箱，产品还涉及工业自动化的控制类PLC配电柜。

With analysis on the control model, an improved automatic tuning method for arc-suppression coil is proposed, that is: adopting voltage feed forward control to restrain interfere of 50Hz displacement voltage, which can improve the characteristic of the injected signal significantly, make the injected signal without reference to unbalanced network and neutral displaced system. Another innovation is detecting the magnitude of neutral point signal-frequency voltage to judge the resonant state, which improves the sensitivity and accuracy of resonant judgement effectively.

基于对控制模型的分析，提出了一种新的注入变频信号的消弧线圈自动调谐方法：通过电压前馈校正控制的引入，有效抑制了50Hz工频电压对注入信号的干扰，使得注入信号不受电网不对称及中性点位移电压的影响；提出以中性点注入信号电压幅值最大做为新的谐振判据，有效提高了谐振状态判断的灵敏度和准确度。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。