Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
新闻动态 News
搜索 Search
你的位置:首页 > 新闻动态 > 公司新闻

松川电器为您提供中间继电器结构及原理

2013/11/26 10:02:33点击:

结构及原理

⒈线圈装在"U"形导磁体上,导磁体上面有一个活动的衔铁,导
磁体两侧装有两排触点弹片。在非动作状态下触点弹片将衔铁向上托起,使衔铁与导磁体之间保持一定间隙。当气隙间的电磁力矩超过反作用力矩时,衔铁被吸向导磁体,同时衔铁压动触点弹片,使常闭触点断开常开触点闭合,
完成继电器工作。当电磁力矩减小到一定值时,由于触点弹片的反作用力矩,而使触点与衔铁返回到初始位置,准备下次工作。
⒉本继电器的"U"形导磁体采用双铁心结构,即在两个边柱上均可装设线圈。对于DZY、DZL和DZJ型只装一个线圈,而对于DZB,DZS,DZK型可根据需要在另一个铁心上装以保持线圈或延时用阻尼片等。从而使线圈类型大不相同的继电器都通用一个导磁体。
技术参数
⒈动作电压:不大于70%额定值。
⒉返回电压:不小于5%额定值。
⒊动作时间:不大于0.02S(额定值下)。
⒋返回时间:不大于0.02S(额定值下)。
⒌电气寿命:继电器在正常负荷下,电寿命不低于1万次。
⒍功率消耗:直流回路不大于4W,交流回路不大于5VA。
⒎触点容量:在电压不超过250V、电流不超过1A的直流有感负荷(时间常数τ=5±0.75ms)中,断开容量为50W;在电压不超过250V、电流不超过3A的交流回路中为250VA(功率因数CosΦ=0.4±0.1),允许长期接通5A电流。
⒏绝缘电阻:
下列部位用开路电压500V兆欧表测量其绝缘电阻应≥300MΩ(常温下)。
①导电端子与外露非带电金属或外壳之间;②动、静触点之间;③常开触点与常闭触点之间;④触点与电压回路之间。
⒐介质强度:
对下部位应能承受规定的交流电压试验1分钟而无绝缘击穿或闪络现象。
①所有导电端子与外露非带电金属或外壳之间2000V/50Hz;
②动、静触点之间1000V/50Hz;
③常开触点(继电器上的NO)与常闭触点(继电器上的NC[1])之间1000V/50Hz;
④触点与电压回路之间1000V/50Hz。
⒑抗干扰性能:继电器的抗干扰应符合 DL478-92《静态继电保护及自动装置通用技术条件》中的有关规定。