公开(公告)号：DE19702094A1

公开(公告)日：1998-07-23

申请号：DE19702094

申请日：1997-01-22

Applicant: ABB RESEARCH LTD

Inventor： DULLNI EDGAR DR ,  GLATZ-REICHENBACH JOACHIM DR ,  KUHLEFELT JAN ,  LOITZL RUZICA ,  PELANEK ZDENEK ,  SKINDHOEJ JOERGEN DR ,  STRUEMPLER RALPH DR

IPC: H01H33/16 ,  H02H3/02 ,  H01C1/16

Abstract: The circuit breaker device (L) has at least one current conductor to which a high voltage is applied. A series circuit is arranged in the path of the current conductor. The series circuit includes a switch point and a current limiting element including at least one PTC resistor and at least one parallel connected varistor. A device for operating the switch point cooperates with the current limiting element. The current limiting element has n parallel circuits connected in series. Each parallel circuit has at least one PTC resistor and at least one varistor connected in parallel. n is a natural number greater than 1. A current sensor acting on an input of the switch actuator is arranged in the current path of the current conductor.

公开(公告)号：DE19702094B4

公开(公告)日：2008-01-24

申请号：DE19702094

申请日：1997-01-22

Applicant: ABB RESEARCH LTD

Inventor： DULLNI EDGAR ,  GLATZ-REICHENBACH JOACHIM ,  KUHLEFELT JAN ,  LOITZL RUZICA ,  PELANEK ZDENEK ,  SKINDHOEJ JOERGEN ,  STRUEMPLER RALPH

IPC: H01H33/16 ,  H02H3/02 ,  H02H3/08 ,  H02H9/02

Abstract: A power switching apparatus is disclosed which has an electrical conductor to which high voltage can be applied. A series of circuits formed by a switching point and a current-limiting element which contains PTC thermistors and varistors is arranged in the cable run of the electrical conductor. An apparatus for operating the switching point interacts with the current-limiting element. The current-limiting element has n (where n is a natural number greater than 1) series-connected parallel circuits each having at least one PTC thermistor and at least one varistor connected in parallel with it. A current sensor arranged in the cable run of the electrical conductor or those connections of one of the PTC thermistors and of the varistor connected in parallel with it which are interconnected at two junction points in one of the parallel circuits are operatively connected to the input of the operating apparatus. Such a power switching apparatus is designed using economic components, such as PTC thermistors and varistors for low-voltage applications, and a switching device which is designed for switching only low currents and can effectively limit large and small short-circuit currents without the current-limiting element connected upstream of the switching device, and/or the switching device, being overloaded.

公开(公告)号：DE19534442A1

公开(公告)日：1997-03-27

申请号：DE19534442

申请日：1995-09-16

Applicant: ABB RESEARCH LTD

Inventor： GLATZ-REICHENBACH JOACHIM DR ,  KUHLEFELT JAN ,  STRUEMPLER RALF DR

IPC: H01C7/02 ,  H02H3/08

Abstract: The device includes a high-voltage current conductor (R) with a switch point (CB) arranged in the conductor path, and a activator coil (TC) which operates the switch. A current converter (CT) mirrors currents in conductor (R) in a secondary current loop which contains the activator coil. If the mirrored current oversteps a predetermined threshold value, it causes an activation of the coil, and therefore the switch. At least one PTC element is connected in parallel to the activator coil, whose resistance rises above a certain threshold value of the current in the secondary current loop.