描述
一、產(chǎn)生誤差的主要原因如下:
1)一次繞組電阻及漏抗,引起空載及負載誤差;
2)二次繞組電阻及漏抗,引起負載誤差;
3)鐵芯勵磁電流,引起非線性空載誤差;
4)一次側(cè)容性濁漏電流引起容性誤差。
二、相應(yīng)的降低誤差的方法如下:
1)鐵芯要盡量減少接縫,優(yōu)先采用卷鐵芯,磁密均勻,且總順著硅鋼片的輾壓方向。
2)縮短鐵芯平均磁路長度,以減小勵磁安匝。
3)采用高導(dǎo)磁率的鐵芯材料,如Z10型冷軋硅鋼片,對精密互感器,一般采用飽和磁密高的坡莫合金。鐵芯進行熱處理時,要防止?jié)B碳,避免過度氧化,要采用適當(dāng)?shù)耐嘶饻囟群退俣取?/p>
4)適當(dāng)降低磁密,冷軋硅鋼片疊片鐵芯,一般設(shè)計為6000~8000GS,冷軋硅鋼片卷鐵芯,一般為10000~13000GS。
5)要兼顧誤差,合理確定繞組匝數(shù)。準(zhǔn)確等級高的互感器,匝數(shù)要少一些,準(zhǔn)確等級低的互感器,可適當(dāng)多一些。
產(chǎn)品廣泛應(yīng)用于:電力、石油、礦井提升、港口、供熱、燃氣、供水、污水處理、冶金、造紙、紡織、化工、水利等現(xiàn)代化工業(yè)領(lǐng)域!
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅(qū)動模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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