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1. WO2000044078 - CIRCUIT BREAKER

Publication Number WO/2000/044078
Publication Date 27.07.2000
International Application No. PCT/CN2000/000013
International Filing Date 24.01.2000
Chapter 2 Demand Filed 07.08.2000
IPC
H02H 3/253 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
24responsive to undervoltage or no-voltage
253for multiphase applications, e.g. phase interruption
H02H 3/33 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
26responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
32involving 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
33using summation current transformers
CPC
H02H 3/253
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection
24responsive to undervoltage or no-voltage
253for multiphase applications, e.g. phase interruption
H02H 3/334
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection
26responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
32involving 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
33using summation current transformers
334with means to produce an artificial unbalance for other protection or monitoring reasons or remote control
Applicants
  • LAM, Sheirchun [CN/CN]; CN
Inventors
  • LAM, Sheirchun; CN
Agents
  • SHANGHAI PATENT & TRADEMARK LAW OFFICE; Xu, Yiping 435 Guiping Road Shanghai 200233, CN
Priority Data
09/236,36425.01.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CIRCUIT BREAKER
(FR) DISJONCTEUR DE CIRCUIT
Abstract
(EN)
A circuit breaker (10) for use in a power/load circuit formed by a three-phase AC power supply (11) and a load (12) connected to the power supply (11) by means of three live power lines (R-R', S-S' & T-T'). The circuit breaker (10) comprises a tripping circuit (60) including switches (SW1) connected in series with the respective power lines facing the power supply (11), a transformer (T1) having at least three balanced primary windings (P1 to P3) connected subsequently in series along the respective power lines and a secondary winding (S1), and a voltage comparator (50) connected to the secondary winding (S1) for comparing a voltage induced in the transformer (T1) with a reference voltage and then in the event of a leakage fault providing a tripping signal for the tripping circuit (60) to open the switches (SW1). A circuit path (X) is provided, which has a combined voltage sensor/comparator (30) and extends across opposite sides and externally of the transformer (T1) for sensing and comparing two phase-to-phase voltages with each other and then in the event of a voltage imbalance fault simulating a leakage fault condition for the transformer (T1) to detect and the voltage comparator (50) to provide a tripping signal.
(FR)
L'invention concerne un disjoncteur de circuit (10) utilisé dans un circuit de puissance/charge se composant d'une alimentation en courant alternatif triphasé (11) et d'une charge (12) connectée à une alimentation (11) par l'intermédiaire de trois lignes d'électricité (R-R', S-S', T-T'). Le disjoncteur (10) comprend un circuit de déclenchement (60) constitué de commutateurs (SW1) montés en série avec les lignes d'électricité respectives opposées à l'alimentation (11), un transformateur (T1) doté d'au moins trois enroulements équilibrés (P1, P2, P3) montés en série le long des lignes d'électricité et d'un second enroulement (S1), ainsi qu'un circuit de comparaison de la tension (50) relié au second enroulement (S1) destiné à comparé une tension induite dans le transformateur (T1) avec une tension de référence puis en cas de fuite, à fournir un signal de déclenchement vers le circuit de déclenchement (60) pour ouvrir les commutateurs (SW1). Un chemin (X) de circuit, ayant un circuit de comparaison et un capteur combinés (30), s'étend à travers les côtés opposés et hors du transformateur (T1) en vue de capter et de comparer des tensions phase-à-phase. Dans le cas de déséquilibre de tension simulant une fuite, le capteur sert à détecter et le circuit de comparaison de tension (50) sert à émettre un signal de déclenchement.
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