Abstract:
The present invention is concerned with a method of distance protection of parallel transmission lines applicable both to series compensated and uncompensated electric power lines, using a distance relay. The method is characterized in that a pair of a flags (ff1, ff2) are calculated for indication faulted and healthy circuits in parallel lines and in the same time a flag (lnternal_Fault) for indication internal or external fault in parallel lines is calculated in independent way. Next gathering all calculated flags (ff1, ff2, lnternal_Fault) an analyze of the value of these flags are performed and depending on the values of flags (ff1, ff2, lnternal_Fault) and on their reciprocal relationship, a trip permission signal from the protection relay (4) is released and sent to the alarms devices or to the line breakers, or a block signal from the protection relay (4) is generated and sent to the users in order to protect parallel lines before damage.
Abstract:
The present invention is concerned with a method of distance protection of parallel transmission lines applicable both to series compensated and uncompensated electric power lines, using a distance relay. The method is characterized in that a pair of a flags (ff 1 , ff 2 ) are calculated for indication faulted and healthy circuits in parallel lines and in the same time a flag (lnternal_Fault) for indication internal or external fault in parallel lines is calculated in independent way. Next gathering all calculated flags (ff 1 , ff 2 , lnternal_Fault) an analyze of the value of these flags are performed and depending on the values of flags (ff 1 , ff 2 , lnternal_Fault) and on their reciprocal relationship, a trip permission signal from the protection relay (4) is released and sent to the alarms devices or to the line breakers, or a block signal from the protection relay (4) is generated and sent to the users in order to protect parallel lines before damage.
Abstract:
A pump system. The pump system includes a pump, a motor coupled to the pump, a sensor coupled to a power source, and a controller. The motor operates the pump. The sensor detects an electrical characteristic of the power source. The controller executes a fault check, controls the motor, detects a change in the electrical characteristic, and suspends the execution of the fault check for a predetermined period of time when the detected change in the electrical characteristic is outside of a valid characteristic range.
Abstract:
Ensemble de contacteur et procédé de gestion associé. L'invention concerne un ensemble de contacteur (1) pour tableau électrique (100), comprenant une unité de commande (3), un sectionneur d'alimentation électrique (2) contrôlé par l'unité de commande (3), caractérisé en ce que ledit ensemble de contacteur comprend en outre au moins un organe de mesure (4, 5), une unité d'évaluation (6) des données mesurées par ledit organe de mesure (4, ), l'unité de commande (3) coopérant avec l'unité d'évaluation (6) de manière à ce que l'unité de commande (3) contrôle le sectionneur d'alimentation électrique (2) en fonction de l'évaluation des données.
Abstract:
Ein Motor eines elektrischen Geräts, insbesondere eines elektrischen Haushaltsgeräts, weist eine absolute Leistungsgrenze (P.limit), ab welcher er nicht betrieben werden kann, ohne Schaden zu nehmen, und eine Nominalleistung (P.max), welche unterhalb der absoluten Leistungsgrenze (P.limit) liegt und mit welcher er dauerhaft betrieben werden kann, ohne Schaden zu nehmen, auf. Im Fall eines erhöhten Leistungsbedarfs (P.required), der über der Nominalleistung (P.max) des Motors liegt, kann der Motor in begrenztem Umfang in einem Boost-Modus mit einer erhöhten Leistung (P.incr) betrieben werden, welche um eine zusätzliche Leistung (P.boost) über der Nominalleistung (P.max) liegt, aber die absolute Leistungsgrenze (P.limit) nicht übersteigt.
Abstract:
Disclosed are systems, devices, circuits, components, mechanisms, and processes in which a switching mechanism can be coupled between components. The switching mechanism is configured to have an on state or an off state, where the on state allows current to pass along a current path. A monitoring mechanism has one or more sensing inputs coupled to sense an electrical characteristic at the current path. The electrical characteristic can be a current, voltage, and/or power by way of example. The monitoring mechanism is configured to output a reporting signal indicating the sensed electrical characteristic. The monitoring mechanism can be integrated with the switching mechanism on a chip.
Abstract:
A smart circuit breaker is provided. An electronic device can be electrically positioned between a utility and an electrical power outlet, electrical subpanel, load center, transformer, or other power distribution center. The electronic device can include a circuit breaker associated with an electrical power circuit, a communications device, a monitoring device and an electronic circuit. The electronic circuit can be operable with the circuit breaker, the communications device and the monitoring device to determine an account of a user of the electrical power circuit and to determine from the account whether to supply power to the electrical power circuit. Further, the electronic circuit can be operable with the circuit breaker, the communications device and the monitoring device to, if power is supplied to the electrical power circuit, charge the account and activate the circuit breaker if the monitoring device detects an undesirable power condition.
Abstract:
In the field of electrical networks, and in particular distribution networks that include distributed voltage sources such as distributed generators, there is a need to safely manage the operation of the networks. A circuit interruption apparatus (10), for an electrical network (18), comprises a circuit interruption device that is operatively connectable at a source side (30) to a source of the electrical network (18) and at a back side (32) to a load of an electrical network (18). The circuit interruption device when closed permits current to flow between the source side (30) and the back side (32), and the circuit interruption device when open inhibits current from flowing between the source side (30) and the back side (32). The current interruption device is configured to open when a current (I) flowing therethrough meets or exceeds a fault current threshold. The circuit interruption apparatus (10) also includes a fault current level determination unit that is configured to determine a predicted fault current level (I PFI ) as a function of measured current and voltage values (I, U) at the circuit interruption device before and after a variation in the current and voltage values (I, U) at the circuit interruption device that result from a change of load at the back side (32) of the circuit interruption device.
Abstract:
A protection system (200) for high voltage direct current, HVDC, transmission lines is provided. The protection system comprises a direct current, DC, bus (201), means (202) for connecting an HVDC transmission line to the bus, at least one DC circuit breaker (203, 204) arranged for disconnecting the transmission line from the bus upon reception of a trip signal, current (211) and voltage sensors (212), an inductor (213) arranged such that the current through the transmission line passes the inductor, and a fault detection unit (220). The fault detection unit is arranged for assessing, on the basis of current and/or voltage measurements, whether a fault exists on the transmission line, and sending, if a fault is detected on the transmission line, a trip signal to the circuit breaker. The additional inductance limits the rise in fault current and facilitates a selective fault detection. Further, a method of fault protection for an HVDC transmission line is provided.
Abstract:
A smart circuit breaker is provided. An electronic device can be electrically positioned between a utility and an electrical power outlet, electrical subpanel, load center, transformer, or other power distribution center. The electronic device can include a circuit breaker associated with an electrical power circuit, a communications device, a monitoring device and an electronic circuit. The electronic circuit can be operable with the circuit breaker, the communications device and the monitoring device to determine an account of a user of the electrical power circuit and to determine from the account whether to supply power to the electrical power circuit. Further, the electronic circuit can be operable with the circuit breaker, the communications device and the monitoring device to, if power is supplied to the electrical power circuit, charge the account and activate the circuit breaker if the monitoring device detects an undesirable power condition.