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差动继电器技术数据

2013/12/20 13:36:14点击:
差动继电器技术数据
1.额定电流5A,额定频率50Hz。
2.无制动时继电器的起始动作安匝AWo=60±4。
3.当用于保护三绕组电力变压器时,其动作电流可在3A至12A的范围内进行整定(AWo=60),对于动作的最小整定值,其最大平衡系数接近于2。
当用于保护两绕组电力变压器时,其动作电流可以在1.55A至12A的范围内进行整定。
4.差动继电器由动作电流与制动电流的比值所决定的制动系数Kz可以在广泛的范围内变化,图3的制动特性AWp=f(AWz)是其极限范围,它与工作电流和制动电流间的相位角有关,但无论在任何角下都不应越出曲线的范围。
5.可靠系数(当一次动作电流等于5IDZ,的继电器正弦动作电流与当一次动作电流等于IDZ的正弦动作电流的比值)不小于1.35。
6. 3倍动作电流时差动继电器的动作时间不大于0.035s。
7.继电器具有一个动合触点,在电感性负荷的直流电路中,(其时间常数不大于5×10-3s),且电压不大于220V,电流不大于2A时,触点的断开容量50W。
8. 在正常工作状态下当电流为5A且变流器的制动绕组平衡绕组在全部匝数投入的情况下继电器的单相功率消耗不大于8.5VA。
9. 变流器的工作、平衡和制动绕组可长期通过电流10A。
10. 介质强度:继电器的电路对外露非带电金属部分之间应能耐受2kV,50Hz的交流电压历时1min而无击穿或闪络现象。