Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO1979000127) DEFECT CURRENT PROTECTION SWITCH,REACTING TO DOUBLE BIASED DIRECT DEFECT CURRENTS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000127 International Application No.: PCT/EP1978/000013
Publication Date: 22.03.1979 International Filing Date: 28.08.1978
IPC:
H01H 83/14 (2006.01) ,H02H 3/33 (2006.01)
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
H
ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
83
Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
14
operated by unbalance of two or more currents or voltages, e.g. for differential protection
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
26
responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
32
involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
33
using summation current transformers
Applicants:
Inventors:
Priority Data:
7807502.09.1977LU
Title (EN) DEFECT CURRENT PROTECTION SWITCH,REACTING TO DOUBLE BIASED DIRECT DEFECT CURRENTS
(FR) INTERRUPTEUR DE PROTECTION A COURANT DE DEFAUT, REAGISSANT AUX COURANTS DE DEFAUT CONTINUS DES DEUX POLARITES
Abstract:
(EN) Defect current protection switch, in which the conductors (5) are associated to a core (6) of which the magnetic induction flux actuates, in case of defect, a tripping device. When a magnetic field produced by the defect current is superposed to a permanent magnetic field, the magnetic field in the magnetic system of the tripping device may become so weak that the armature (8) falls. The core (6) can form, particularly, several turns around the conductors (5) and be an integral part of the magnetic system (1) comprising the conductors of the induction flux (7) of the tripping device. The core (6) goes across the conductors of the induction flux (7) of the tripping device.
(FR) Interrupteur de protection a courant de defaut, dans lequel les conducteurs (5) sont associes a un noyau (6) dont le flux magnetique d"induction actionne, en cas defaut, un dispositif de declenchement. Lorsqu"un champ magnetique produit par le courant de defaut est superpose a un champ magnetique permanent, le champ magnetique dans le systeme magnetique du dispositif de declenchement peut devenir si faible que l"armature (8) tombe. Le noyau (6) peut notamment former plusieurs spires autour des conducteurs (5) et faire partie du systeme magnetique (1) comprenant les conducteurs du flux d"induction (7) du dispositif de declenchement. Il est prevu que le noyau (6) croise les conducteurs du flux d"induction (7) du dispositif de declenchement.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)
Also published as:
EP0006903US4329668