描述
一、产生误差的主要原因如下:
1)一次绕组电阻及漏抗,引起空载及负载误差;
2)二次绕组电阻及漏抗,引起负载误差;
3)铁芯励磁电流,引起非线性空载误差;
4)一次侧容性浊漏电流引起容性误差。
二、相应的降低误差的方法如下:
1)铁芯要尽量减少接缝,优先采用卷铁芯,磁密均匀,且总顺着硅钢片的辗压方向。
2)缩短铁芯平均磁路长度,以减小励磁安匝。
3)采用高导磁率的铁芯材料,如Z10型冷轧硅钢片,对精密互感器,一般采用饱和磁密高的坡莫合金。铁芯进行热处理时,要防止渗碳,避免过度氧化,要采用适当的退火温度和速度。
4)适当降低磁密,冷轧硅钢片叠片铁芯,一般设计为6000~8000GS,冷轧硅钢片卷铁芯,一般为10000~13000GS。
5)要兼顾误差,合理确定绕组匝数。准确等级高的互感器,匝数要少一些,准确等级低的互感器,可适当多一些。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
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⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
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⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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