| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 361065000 | With current and voltage responsive fault sensors | 15 |
| 20080239602 | FAST IMPEDANCE PROTECTION TECHNIQUE IMMUNE TO DYNAMIC ERRORS OF CAPACITIVE VOLTAGE TRANSFORMERS - The present invention relates to methods for providing impedance protection differentiating between in-zone and out-of-zone faults based on instantaneous, digitally derived operating and polarizing, distance comparator signals. The method uses a pair of fast orthogonal filters to derive D and Q components of the input voltages and currents. Two sets of operating and polarizing signals are derived for better speed of response under varying fault moment with respect to the peaks and zero crossings of power signals. Three stages of comparison between the operating and polarizing impedance terms are used. These comparator stages use half a cycle averaging windows, and three-quarters-of-a-cycle windows. The first stage of comparison is based on energy comparator responding to both magnitude and phase information in the signals. Stages 2 and 3 are of phase comparison type, responding mostly at the phase information and neglecting the magnitude information for better immunity to noise and signal distortions. | 10-02-2008 |
| 20080278875 | Safety switching apparatus for a failsafe disconnection of an electrical load - A safety switching apparatus for failsafe disconnection of an electrical load has a first and a second connecting terminal for connecting a first signaling switch and a third and a fourth connecting terminal for connecting a second signaling switch. It also has a first and a second output switching element, which are designed to produce a redundant output switching signal. The first connecting terminal is connected to a first potential and the third connecting terminal is connected to a second potential. The potentials differ from one another. In addition, the second connecting terminal is coupled to the first switching element in such a way that the first switching element receives the first potential via the first signaling switch. Likewise, the fourth connecting terminal is coupled to the second switching element in such a way that the second switching element receives the second potential via the second signaling switch. According to one aspect of the invention, a circuit arrangement is provided for determining at least one further potential at the second and/or fourth connecting terminal, and said circuit arrangement is designed to control the redundant output switching signal as a function of the further potential. | 11-13-2008 |
| 20090174976 | CURRENT DIFFERENTIAL RELAY DEVICE, SIGNAL PROCESSING METHOD THEREOF AND POWER TRANSMISSION LINE PROTECTION SYSTEM - Two current differential relay devices | 07-09-2009 |
| 20100118458 | Power Switching Arrangement - A circuit protection system for a power panel is disclosed. The circuit protection system includes a transistor connected in a channel of a power panel, the transistor connected between return connections of a load and a return path, and the power panel including a plurality of channels connected to the load. The circuit protection system also includes control circuitry electrically connected in parallel with the transistor, the control circuitry configured to selectively activate the transistor to allow current to pass through the transistor based on an observed voltage across the transistor. | 05-13-2010 |
| 20110085273 | Circuit Breaker With Improved Re-Closing Functionality - A circuit breaker for protecting a power line. The circuit breaker includes a control unit and a circuit breaking element disconnecting the power line from a power source. The control unit detects a fault on the power line, opens the circuit breaking element, which opening starts a disconnection time interval, injects a test signal into the power line, measures a response, determines an impedance of the power line from the response, analyses the impedance during the time interval based on comparing the impedance with a reference threshold, determines a permanent or a temporary fault based on the analysed impedance, re-closes the circuit breaking element after the time interval if the fault is temporary and keeps the circuit breaking element open after the time interval if the fault is permanent. | 04-14-2011 |
| 20110242715 | Power Management Arrangement and Method in a Utility Meter - An arrangement for controllably disconnecting a utility power service from a load includes a utility meter housing, a service switch, an energy storage device and a control circuit. The utility meter housing includes metrology circuitry configured to generate metering information regarding electrical power provided to the load. The service switch is configured to controllably interrupt a connection between the utility power service and the load, and has a controller. The control circuit is configured to cause the energy storage device to be connected to the controller responsive to a service disconnect command. The control circuit is further configured to cause a portion of the metrology circuit to be connected to the energy storage device and the meter power supply to be disconnected from the portion of the metrology circuit responsive to a power interruption detection signal. | 10-06-2011 |
| 20120063045 | DETECTING AND SELECTIVELY IGNORING POWER SUPPLY TRANSIENTS - Systems and methods for discriminating a negative-going load fault from a positive-going input voltage (VIN) surge are disclosed. The system includes a circuit that senses the VIN voltage to generate a disable signal, if the positive-going VIN surge is identified. Specifically, the circuit can include a high pass filter to facilitate identification of the positive-going VIN surge. Moreover, the disable signal is employed to control an overcurrent comparator that provides an overcurrent shut-off. Typically, when the positive-going VIN surge is identified, the disable signal is generated, which masks the overcurrent response, such that, normal operation can be continued without erroneously shutting-off the load. | 03-15-2012 |
| 20120162839 | SAFETY DISCHARGE APPARATUS FOR AN ELECTRICAL STORAGE ELEMENT - A safety discharge apparatus for an electrical storage element includes a load device for discharging the electrical storage element connected to the safety discharge apparatus via input connections. The apparatus includes a clocked switching device connected to a control device that serves to produce and interrupt a discharge current via the load device and the storage element, and a voltage detection device that detects a storage voltage of the electrical storage element to be discharged. The voltage detection device is connected to a discharge condition monitor that checks a dischargeability of the electrical storage element. An operating method for a safety discharge apparatus is also disclosed. | 06-28-2012 |
| 20130088802 | FAULT PROTECTION OF HVDC TRANSMISSION LINES - A protection system for high voltage direct current, HVDC, transmission lines is provided. The protection system includes a direct current, DC, bus, a device configured to connect an HVDC transmission line to the bus, at least one DC circuit breaker arranged for disconnecting the transmission line from the bus upon reception of a trip signal, current and voltage sensors, an inductor arranged such that the current through the transmission line passes the inductor, and a fault detection unit. 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. | 04-11-2013 |
| 20130258536 | BUSBAR DIFFERENTIAL PROTECTION METHOD - The present invention relates to a busbar differential protection method. For each bay, firstly, zero-crossing point of voltage is determined according to sample values of voltage, then the current values are re-sampled on a current fitting curve by using zero-crossing point of voltage as a synchronous signal according to a given sampling time period to get a sample sequence. The sample sequence is comprised of current values of sampling points and sample serial numbers. The sample serial numbers of sampling points at the same time are same for the sample sequence of respective interval. Finally, computing is done to sample sequences of respective intervals, and differential protection is achieved. | 10-03-2013 |
| 20130271884 | POWER MANAGEMENT AND DISTRIBUTION SYSTEM HAVING A FAULT DETECTION AND ISOLATION ASSEMBLY AND METHOD - A power management and distribution system includes a source block having a power distribution line, wherein the power distribution line includes a distribution switch. At least one load block is in operable communication with the power distribution line and having a plurality of load block power output lines, wherein each of the plurality of load block power output lines includes a load switch. Further included is a plurality of loads each carried power by at least one of the plurality of load block power output lines. Yet further included is a protection logic unit comprising at least one algorithm for comparing a power characteristic to a power characteristic threshold at a plurality of locations, wherein the protection logic unit selectively determines which of the source block switches, distribution switches and the load switches of the plurality of load block power output lines are opened based on at least one comparison. | 10-17-2013 |
| 20140240881 | PROTECTION ELEMENT HAVING INTEGRATED DISTANCE PROTECTION WITH REAL TIME ADAPTATION OF THE TRIGGER TIME FOR DETECTING AND SEPARATING HIGH IMPEDANCE ERRORS IN MESHED NETWORKS - A protection element for a meshed energy supply network of a means of transport, in particular of an aircraft, a meshed energy supply network having such protection elements, a method for protecting such a meshed energy supply network and a computer program for executing the method. The protection element comprises a control unit, which is formed to deduce a trigger time value from a detected fault impedance value of a network error that has occurred in the energy supply network and to adapt the trigger time value in the event of a subsequent change in the fault impedance value of the network error, and a separation unit for interrupting a connection between the protection element and the network error depending on the trigger time value. | 08-28-2014 |
| 361066000 | With communication between feeder disconnect points | 3 |
| 20110063767 | CHARGING CURRENT COMPENSATION FOR LINE CURRENT DIFFERENTIAL PROTECTION - Current differential protection with charging current compensation is provided for a power apparatus, such as a power transmission line. Individual terminals dynamically determine their respective contributions, if any, to the charging current compensation value as availability of one or more voltage sources dynamically changes within the power apparatus. Respective terminals calculate local contributions to a charging current compensation value based on local voltage measurements. A loss of a voltage source is handled by adjusting multipliers for the remaining compensation points to reflect the total charging current. A local contribution is suppressed when the local voltage source is no longer available. After applying the local contributions, an alpha plane analysis may be used to determine when to trip the power apparatus. | 03-17-2011 |
| 20150116876 | METHOD OF FAULT CLEARANCE - There is a method of fault clearance for a DC power grid ( | 04-30-2015 |
| 20160190790 | Adaptive Protection For Distribution Grid Based On Area Concept - Method of protecting a distribution network with a line interconnecting busbars, each busbar being connectable, by means of switching devices adjacent to the busbar, to the line and to loads and/or generators. The method divides the distribution network in multiple protection areas, each comprises a busbar, a protection device and an area controller. Upon a change in connect status of a distribution feeder line, load or generator connectable to one of the busbar, the logic controller in this protection area re-calculates the short circuit level of the areas. Based on the recalculated short circuit levels, the protection settings of the areas may be adapted. The embodiment also provides a system and computer program product adapted to perform the method. | 06-30-2016 |
