基于超程时间回归模型的继电器寿命预测方法

继电器寿命预测可以有效指导继电器的快速筛选,以期达到高性能、高可靠、长寿命甚至零缺陷的要求。针对于继电器寿命预测主要集中于批产品的现状,本文提出基于超程时间回归模型的继电器寿命预测方法,该方法可实现对单个继电器产品的寿命预测。首先对以往测得的关于HH52P型继电器试验数据进行详细研究,得到继电器的超程时间数据。然后将超程时间数据分区处理后融入超程时间回归模型中,进而实现继电器的寿命预测,并使继电器寿命预测具有更高的精确性。

一种新型航天继电器寿命试验及分析系统

目前的航天继电器寿命试验装置在进行继电器寿命试验时,仅监测接触压降及开路电压,忽略了大量可用于失效分析、可靠性评估及寿命预测的过程退化数据。本文在分析现有寿命试验方法不足的基础上,将寿命试验与时间参数监测相结合,提出了一种符合国军标要求的新型寿命试验方法并开发了相应的试验系统。可在继电器寿命试验过程中,对其时间参数(包括吸合/释放时间、弹跳时间、超程时间等)和电参数(接触压降)的退化过程进行实时监测,并基于所监测得到的数据,实现继电器的可靠性评估、失效分析及一致性分析等功能。

UL508目击实验室电器寿命测试台设计与改进

建立UL508目击实验室要解决的是设备如何满足标准的需要,主要的测试设备——电器寿命实验台,通过软硬件的配合,达到对试品的全面测试,使之满足UL508标准的要求.并且在实践中对设备的功能软硬件进行改进,使它大大缩短测试时间.

继电器电寿命试验无线测控系统的设计

提出了应用ZigBee无线通信网络技术实现继电器电寿命试验的控制和检测。通过在上位机(工业控制计算机)加装ZigBee通信模块,负载柜加装MSP430单片机开发板和ZigBee通信模块,实现上位机和试验负载柜之间试验数据的无缝连接,使得电寿命试验的模块化程度更高,提高了设备的可靠性,降低了功耗和试验设备的成本。该设备已研制成功,性能良好,运行稳定。

电器开关的寿命和提升寿命途径探讨

提高产品的寿命,首先必须对产品的寿命有较科学的、准确的判断方法,以求得共识,才会有进一步采取改进的措施。同时针对电器开关的使用,提出一些延长寿命的途径。

银金属氧化物触点继电器电寿命的分析

在比较严酷的环境当中,通常会对密封型继电器进行使用,但是如果继电器是由银金属氧化物材料制作而成的,继电器长时间处于密封条件下,对电寿命会造成严重影响,因此不能满足应用的实际需求。在这篇文章中,主要从继电器温度升高、电弧能量以及电寿命实验之后所接触的材料等方面,实现对触点材料的选择,并且在进行具体实验中后可以发现,如果使用非银金属氧化物来代替银金属氧化物来作为继电器的触点材料,可以将继电器电寿命有效提升上去。

Crystalline and amorphous metal sulfide composite electrode materials with long cycle life:Preparation and performance of hybrid capacitors

Crystalline@amorphous NiCo_(2)S_(4)@MoS_(2)(v-NCS@MS)nanostructures were designed and constructed via an ethylene glycol-induced strategy with hydrothermal synthesis and solvothermal method,which simultaneously realized the defect regulation of crystal NiCo_(2)S_(4) in the core.Taking advantage of the flexible protection of an amor-phous shell and the high capacity of a conductive core with defects,the v-NCS@MS electrode exhibited high specif-ic capacity(1034 mAh·g^(-1) at 1 A·g^(-1))and outstanding rate capability.Moreover,a hybrid supercapacitor was assembled with v-NCS@MS as cathode and activated carbon(AC)as anode,which can achieve remarkably high specific energy of 111 Wh·kg^(-1) at a specific power of 219 W·kg^(-1) and outstanding capacity retention of 80.5%after 15000 cycling at different current densities.

电平衡计算方法及其在整车试验中的应用

通过描述电源系统存在的问题,提出电平衡试验的目的,重点介绍电平衡匹配计算方法和电平衡道路试验分析方法。

基于多路开关测试系统设计与改进

文章通过对电器寿命测试系统的软、硬件的改进,将实现在同一测试系统上可同时进行3个通道的开关测试,大大提高测试工作效率。

Vacuum interrupter,high reliability component of distribution switches,circuit breakers and contactors

The use of vacuum interrupters(VIs)as the current interruption component for switches,circuit breakers,reclosers and contactors operating at distribution voltages has escalated since their introduction in the mid-1950’s.This electrical product has developed a dominating position for switching and protecting distribution circuits.VIs are even being introduced into switching products operating at transmission voltages.Among the reasons for the VI’s popularity are its compactness,its range of application,its low cost,its superb electrical and mechanical life and its ease of application.Its major advantage is its well-established reliability.In this paper we show how this reliability has been achieved by design,by mechanical life testing and by electrical performance testing.We introduce the“sealed for life”concept for the VI’s integrity.We discuss this in terms of what is meant by a practical leak rate for VIs with a life of over 30 years.We show that a simple high voltage withstand test is an easy and effective method for monitoring the long-term vacuum integrity.Finally we evaluate the need for routine inspection of this electrical product when it is used in adverse ambient environments.

Lifetime prediction for tantalum capacitors with multiple degradation measures and particle swarm optimization based grey model

A lifetime prediction method for high-reliability tantalum （Ta） capacitors was proposed, based on multiple degradation measures and grey model （GM）. For analyzing performance degradation data, a two-parameter model based on GM was developed. In order to improve the prediction accuracy of the two-parameter model, parameter selection based on particle swarm optimization （PSO） was used. Then, the new PSO-GM（1, 2, co） optimization model was constructed, which was validated experimentally by conducting an accelerated testing on the Ta capacitors. The experiments were conducted at three different stress levels of 85, 120, and 145℃. The results of two experiments were used in estimating the parameters. And the reliability of the Ta capacitors was estimated at the same stress conditions of the third experiment. The results indicate that the proposed method is valid and accurate.

Nb2O5 nanotubes on carbon cloth for high performance sodium-ion capacitors

Hybrid sodium-ion capacitors(SICs)bridge the gap between the supercapacitors(SCs)and batteries and have huge potential applications in large-scale energy storage.However,designing appropriate anode materials with fast kinetics behavior as well as long cycle life to match with the cathode electrodes remains a crucial challenge.Herein,Nb2O5 nanotubes and nanowire-to-nanotube homo-junctions were directly grown on the carbon cloth(CC)via a simple hydrothermal process through regulating the pH value of solution.The as-prepared Nb2O5@CC nanotubes displayed a high reversible capacity of 175 mA hg-1 at the current density of 1Ag-1 with the coulombic efficiency of 97%after 1500 cycles.Besides,the SICs fabricated with Nb2O5@CC and activated carbon(AC)electrode materials showed a high energy density of 195 W h kg-1 at 120 W kg-1,a power density of 7328 W kg-1 at 28 W hkg-1and 80%of the capacitance retention after 5000 cycles.Additionally,the flexible SIC devices can operate normally at various bendable conditions.The Nb2O5@CC nanotubes in this work can be promising electrode materials in flexible and wearable energy storage devices.

Fabricating low-temperature-tolerant and durable Zn-ion capacitors via modulation of co-solvent molecular interaction and cation solvation

Aqueous Zn-based energy-storage devices have aroused much interest in recent years.However,uncontrollable dendrite growth in the Zn anode significantly limits their cycle life.Moreover,the poor low-temperature performance arising from the freezing of aqueous electrolytes at sub-zero temperatures restricts their practical applications in cold regions.Here,we fabricated low-temperature-tolerant and durable Zn-ion hybrid supercapacitors(ZHSCs)via modulating a co-solvent water/ethylene glycol electrolyte.The interaction of intermolecular hydrogen bonds between water and ethylene glycol as well as cation solvation was systematically investigated by tuning the co-solvent composition.The results illustrate that the ZnSO_(4)/water/ethylene glycol(65%)electrolyte possesses high ionic conductivity at low temperatures and effectively prevents the dendrite formation of the Zn anode.The as-fabricated ZHSCs exhibit long-term cyclability and are capable of working at sub-zero temperatures as low as -40℃.The present ZHSCs are anti-freezing and cost-effective,which may find new applications in the fields of next-generation electrochemical energy storage devices.

All-climate aqueous Na-ion batteries using “water-in-salt” electrolyte

Aqueous Na-ion batteries have been extensively studied for large-scale energy storage systems. However,their wide application is still limited by their inferior cycle stability(<3000 cycles) and poor temperature tolerance. Furthermore, many of the reported high rate behaviors are achieved at a low mass loading(<3 mg cm^(-2)) of the electrodes. Herein, we propose an aqueous Na-ion battery which includes a Ni-based Prussian blue(NiHCF) cathode, a carbonyl-based organic compound, 5,7,12,14-pentacenetetrone(PT)anode and a “water-in-salt” electrolyte(17 mol kg^(-1)NaClO_(4)in water). Its operation involves the reversible coordination reaction of the PT anode and the extraction/insertion of Na;in the NiHCF cathode. It is demonstrated that the wide internal spaces of the PT anode and NiHCF cathode can not only buffer the volumetric change induced by Na;storage, but also enable fast kinetics. The full cell exhibits a supercapacitor-like rate performance of 50 A g^(-1)(corresponding to a discharge or charge within 6.3 s)and a super-long lifespan of 15,000 cycles. Moreover, the excellent rate performance can still be preserved even with a high mass loading of the electrodes(15 mgNiHCFcm^(-2)and 8 mgPTcm^(-2)).Especially, the cell can work well in a wide temperature range, from-40 to 100 °C, showing a typical all-climate operation.

Improving operation lifetime of OLED by using thermally activated delayed fluorescence as host

We fabricated organic light-emitting diodes （OLEDs） with the thermally activated delayed fluorescence （TADF） mate- rial of 4CzlPN, Which show better stability compared with the 4,4＇-Bis（carbazol-9-yl）biphenyl （CBP） based devices. The half lifetime of the device using 4CzlPN as host material has doubled, and a slower voltage rise compared with that of CBP-based devices has been achieved, which indicates the improvement of stability. We attribute the better sta- bility to the good film morphology and difficult crystallization property of 4CzlPN. Our results suggest that employing the 4CzlPN as host material can be a promising way of fabricating OLEDs with longer operation lifetime.