基本信息

• 发明名称： 【发明专利】 Improvements in or relating to devices for the detection of insulation faults with respect to earth in polyphase alternating current electrical networks with an insulated neutral
• 申请日： 1970-08-16
• 申请号/专利号： GB1933164
• 专利权人： 无
• 申请人： CHARBONNAGES DE FRANCE
• 分类号： H02H3/16
• 发明人/设计人： 无
• 公开日/公告日： 1970.08.16
• 优先权号： H02H3/16
• 代理机构：
• 代理人：
• PCT申请号： 无
• PCT申请日期： 无
• PCT进入国家阶段日： 无
• 生物宝藏信息： 无
• 审查员： 无

摘要：1,020,103. Fault testing. CHARBONNAGES DE FRANCE. May 8, 1964 [May 10, 1963], No. 19331/64. Heading G1U. [Also in Division H2] A circuit for indicating insulation faults with respect to earth of a network 2 supplied with polyphase A.C., e.g. from a transformer 1, with insulated neutral, comprises semi-conductor rectifiers 7A-7C connecting each phase to a common point 5 which is connected to earth through a resistance 8 and a current measuring instrument 10. The meter 10 may be calibrated in ohms and checks the overall insulation of the three phases as it will give the same indication for a resistance fault R on one phase as for 2R on two phases or 3R on three phases. A relay 9 may be included in the circuit to open the circuit-breaker 3 if there is a fault. The rectifiers 7A-7C may be protected by fuses 14A-14C and indicator lamps 15A-15C may be connected across the fuses.

摘要附图：