Transformer of tgδ on MSP430F1331 single chip microcomputer WANG Han 1 CAI Xinjing 1,XiaoJieping 2,Liu weiqing 2
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1 2nd Inernaional Workshop on Maerials Engineering and ompuer Sciences (IWMES 205 Transformer of gδ on MSP430F33 single chip microcompuer WANG Han AI Xinjing,XiaoJieping 2,Liu weiqing 2 School of elecrical engineering Norheas Dianli Universiy, Jilin,3202,Jilin hina 2 School of elecrical engineering Norheas Dianli Universiy, Jilin,3202,Jilin hina @qq.com Keywords: high volage insulaion, gδ, msp430f33 Absrac. This aricle designs a insulaion dielecric loss deecing insrumen based on MSP430F33 single chip microcompuer, which is a research on gδ value deecion of dielecric oil and insulaing sleeve. The research shows he applicaion of he new informaion collecion erminal and new algorihm and TG dela deecion is realized. I is urned ou ha he new insulaion dielecric loss deecing insrumen has he characerisics of low power consumpion, high efficiency, accuraely compared wih he AI-6000E dielecric loss es insrumen (he mehod of he resisan bridge..inroducion High pressure equipemen plays an imporan role in power sysem s safe operaion,which has far-reaching influence on power sysem. The problem of high pressure equipmen will resul in large area blockou acciden,even he sysem paralysis in elecric power sysem. Therefore, he mainenance of high pressure equipmen plays an imporan par in rouine mainenance. Dielecric loss es is an effecive way o insulaion defec deecion in high volage elecrical equipmen. Tradiional dielecric loss es usually use dielecric deecor based on schering bridge merhod o deec he loss of insulaing medium for high volage equipmen such as ransformer.bu here are many shorcomings, such as: power consumpion, poor ani-inerference abiliy,complex operaion an so on. These shorcomings are difficul o mee he demand of high efficiency, precision, low power consumpion of daa collecion in modern power sysem. The design in his aricle uses a insulaion dielecric loss deecing insrumen based on MSP430F33 single chip microcompuer. I s sampling secion combines many kinds of inegraed circui. This dielecric loss meer improves he sabiliy and accuracy of informaion sampling wih low power consumpion, fas operaion, processing power and oher advanages. 2. Basic composiion and working principle of he sysem Dielecric loss deecor hardware sysem based on MSP430F33 single chip microcompuer is divided ino wo pars: daa acquisiion and daa processing. When he deecor works, volage sampling sysem firsly carries ou volage es o he deeced objec. Then curren deecion sysem samples he delay ime of sampling o he objec o be measured. T I s conrolled by he clock module in MSP430F33 chip. Sampling sysem ges he sampling informaion of muliple sampling periods and sends he informaion o he daa processing sysem. The daa processing sysem combines ways of Pass Zero Disinguishing Phase and Leas square value, processes he daa repeaedly o ge he angen and sends o LED display sysem and sorage sysem. 3. Sysem hardware circui design 3. Sysem logic diagram The overall block diagram of he hardware sysem is shown in Figure. The sysem is composed of wo pars of he simulaion board and 430 single-chip microcompuer. The simulaion board includes sine wave sampling module, waveform processing module and waveform inegraed module hree pars. 430 single chip microcompuer is daa processing module The auhors - Published by Alanis Press 393
2 Fig. Hardware logic diagram 3.2 waveform sampling module In order o ensure no disorion effec o he maximum degree of he waveform of he acquisiion, LM334 is used as Volage Follower o sample he waveform sampling.the advanages of volage follower are very high inpu impedance and low oupu impedance, which are he mos commonly used impedance ransformaion and maching circui Volage follower is usually used as in buffer sage and ou buffer sage of circui. As high impedance inpu level of he whole circui, i can ease he effec on he signal source; as low impedance oupu sage of he whole circui, i can improve he abiliy o load. LM334 is he hree erminal adjusable consan curren source device. In he working curren, he consan curren source can be adjused o 000: and has a dynamic volage range of -40V wide, whose consan flow characerisic is very good, I is characerized by no need of precision volage amplificaion, compensaion, ec. To sum up, LM334 is used as he volage follower o carry ou he waveform sampling,the disorion of he waveform is reduced o he maximum exen. 3.3 waveform reamen module Algorihm used in daa processing module is high order fiing algorihm based on zero crossing ime difference mehod. In he algorihm, he ime delay difference is obained and is ransformed ino a cerain widh T square wave signal. The dielecric loss value of he sample can be obained by measuring he widh of he square wave. As a resul, i is he mos imporan facor in he acquisiion of dielecric loss o obain a square wave signal wih good, no disorion, and a cerain ani jamming abiliy. This sysem uses LM339 o ransform he sine wave as zero comparaor Zero comparaor s significance lies in Threshold Volage UT=0V When Inegraed Operaional Amplifier lies in open ring sae,he oupu volage is +UOM or -UOM. When he inpu volage is ui<0v, UO=+UOM;When he inpu volage is ui>0v,uo=-uom The advanages of he ne inpu volage of inegraed operaional amplifier and ne inpu curren is approximaely zero so as o proec he inpu level. Because he inegraed operaional amplifier does no work o he nonlinear region, a zero inpu volage is inernal ransisor do no need o ener he sauraed zone gradually from he end zone,or gradually from he sauraed zone o he end zone.so i improves he oupu volage. LM339 is an inegraed circui of four volage comparaor The circui has characers as follows: Operaing power supplies volage range ; boh single power supply and dual power can work. Single power supply: 2~36V, Double power supply: ±~±8V; The curren consumpion is small, Icc=.3mA ; Inpu offse volage is small, VIO= + 2mV; ommon mode inpu volage range, Vic=0 ~ Vcc-.5V; Oupu compaible wih TTL, DTL, MOS, MOS, ec. The oupu can be conneced wih an open collecor "or" door. The sysem uses LM339 as a zero comparaor wih low power consumpion, proecion of inpu sage, improve he speed of oupu waveform changes. 3.4 Waveform inegraion module The signal delay difference of T square wave signal is he key o calculae he dielecric loss value.in he daa processing module, he sine wave signal has been changed o square wave signal Bu a his ime of he wave ype signal is a wo way slighly delayed square wave signal To abain delay signal difference, his sysem combines 4096 No Gae and 408and GAT in order o ge 394
3 T Figure 2 is he schemaic diagram of he wave. In Fig. 2 a, he waveform of he curren inpu signal is adjused by he LM339 of he square wave.figure b he waveform of a square wave of a volage inpu signal by LM339. Figure as he inpu volage signal hrough he 4096 NOT gae signal,figure d for curren and volage inversion afer 408 and he difference of he inegraion ime delay signal waveform T Figure 3 is he real acquisiion of dela T waveform 4. Daa processing Daa processing applies o MSP430 series and F33 as he core PU daa calculaion Measures of Pass Zero Disinguishing Phase and Leas square value are aken o process T square wave signal.( Zero crossing mehod The curren flowing hrough he I o measure he dielecric loss Volage a boh ends of he insulaion U Frequency as a sine wave of 50HZ Through he measuremen of sine wave curren, volage changed from negaive o posiive over ime difference T zero coun pulse in ime domain and hen convered ino phase I ahead of u and TG dela phi difference ( π/ 2 ( π/ 2 2π ( T / T ( 2π( T / T (2 MSP430F33 wih high performance analog devices can be used for accurae measuremen Inegraed 2 is A/D converer for 200ksps,coming wih 6 bi RIS PU and 25ns insrucion cycle. High performance applicaions can be achieved wih less code space.and i has he high sorage space in he single chip microcompuer 64KB In consideraion, a high order algorihm is based on he zero crossing mehod of zero crossing. In daa acquisiion, efficien collecion of high efficiency is done.ollecion period is 0.2 seconds 00 imes. In each collecion, Zero crossing operaion is used o find ou he δ dela value.single chip regisers hen sore i. When i reached 000 imes, compuaion of leas square values is used o ensure daa accuracy and reliabiliy. If we se sinδ o X, and se cosδo y, he following funcions can be obained X D sin cos ( 0 i D i i i i 000 (3 2 Y sin cos u( i 0 i i j (4 From he above 000 operaions can be linear equaion From he above 000 operaions can be linear equaion sin cos sin cos i( 2 2, i(, (5 2 π/ 2 平 D D 0 A... sin u( u( 2 F... u( i u value 000, cos 000 D D D 0, G... i( 00 0 (6 Solving he linear equaions, can ge,and hen ge, Through 平, we can ge he mos accurae dielecric loss 395
4 5. Experimenal resuls are compared wih he AI-6000E dielecric loss es insrumen (he mehod of he resisan bridge. This experimen is done in he field of high volage elecric laboraory of Norheas Dianli Universiy.Samples were colleced for SFZ /0,ransformer insulaion medium oil and B A hree insulaion casing. And he influence of he elecric field inensiy on he daa is considered. Specific daa are shown in Table and 2: Tab.Transformer insulaing oil es Field srengh and AI-6000Egδ% 430gδ% influence of experimen Nofieldsrengh /0Trans former 3 0kV Tab.2 Transformer bushing es Measuremen posiion AI-6000Egδ% 430gδ% A B In Table, he differen working condiions are seleced o compare wih he experimenal resuls.the influence of high pressure on he elecric field inensiy in differen working condiions is considered.the inerference of he 0kV analog line is he mos. The error of he AI-6000E dielecric loss eser is 0.004%. The error of he new ype dielecric loss meer is 0.00%. Elecric field beside he lighning experimen machine is mos unsable.two dielecric loss esing apparaus are all inerference To sum up, new dielecric loss meer can work in differen elecric field srengh, whose error is beween 0.00%-0.003%. In Table 2, he posiion of he ransformer insulaion sleeve is fixed. The impac of oher environmenal facors can no be considered.the experimenal comparison of wo kinds of dielecric loss meer is carried ou. From able 2 we can see ha he experimenal error beween he AI-6000E dielecric loss eser gδ% and 430 gδ% is beween 0.003%-0.006%.The accuracy of he 430 dielecric loss meer is demonsraed.during he experimen, he collecion and operaion ime were measured. 430 dielecric loss meer is due o no need o adjus he capaciance resisance, which in he ime grealy exceeds he AI-6000E dielecric loss eser. 6.onclusion The new inegraed circui informaion acquisiion erminal is differen from he radiional pulse sampling, which is easily influenced by elecric field, emperaure, ec, So i can improve he sabiliy of he collecion informaion. 2Because of high performance of single chip microcompuer, he mehod of calculaing he zero crossing ime difference mehod and he leas square mehod is used, which improves he accuracy of he daa. Besides he calculaion speed is improved compared wih he radiional mehod of 396
5 measuring insrumen of he resisan bridge. 3The whole hardware par uses 3.3V buon baery power supply compared wih he radiional dielecric loss meer can grealy save energy and reduce power consumpion. References [] Wu Weihan, Ma Weimin. Research on porable digial dielecric loss measuring insrumen [J], high volage echnology, :9-94 [2] Gu Huixing.The design and implemenaion of he signal source design and Realizaion of he fine sabiliy of he [D], Xi'an Universiy of Science And Technology,203 [3]hen Haibing. Design of [J]. based on he MSP430F6736 of he full SO single-phase smar meer,205,04:8-2. [4] Qiu Hong, a porable wireless muli-channel daa acquisiion sysem based on MSP 430 MU (, he Journal of science and Science 20,39, [5] hen Yirong.LM334's special applicaion [R] insrumenaion echnology and sensor, no2 [6] Ma Weimin, Wu Weihan. Influence of power supply harmonics on dielecric loss measuremen [J]. Journal of Tsinghua Universiy (NATURAL SIENE EDITION,997,37 ( : [7] Xie Nan, hen Weimin. Design of grid conneced inverer based on disribued new energy generaion [J],202,02: [8]Yi Zhenhua, Sun Yize, Peng Lele, hen Xiao. Power supply design of phoovolaic grid conneced inverer [J],202,08: [9]Pang Qichang, Zhang Haifeng, hen Xiuchun. haracerisics and deecion of high volage corona discharge [J]. Elecrical measuremen and insrumenaion,2006,02: [0]Zhang Jing, Zeng Xianyun. Inroducion of he embedded sysem [J]. Elecrical measuremen and insrumenaion,2002,04:
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