Patent application number | Description | Published |
20090009349 | METHOD OF DETERMINING VOLTAGE STABILITY MARGIN FOR LOAD SHEDDING WITHIN AN ELECTRICAL POWER SYSTEM - A method of monitoring voltage stability within an electrical power system comprises the steps of establishing a dynamic power system stability margin based on an operating characteristic of the power system; indicating that the power system has become unstable when the dynamic power system stability margin falls below a predetermined value; and initiating dynamic load shedding and/or restoration depending on stability margin. | 01-08-2009 |
20120224287 | FUZZY INTERFERENCE RELAY AND METHOD FOR CURRENT DIFFERENTIAL PROTECTION OF A TRANSMISSION LINE - A relay for current differential protection of a transmission line, comprising: a first calculator of symmetrical sequence components of currents of each phase of the transmission line at local and remote ends of the transmission line; a second calculator of phase differences φ | 09-06-2012 |
20120277929 | METHOD OF INITIATING THE LOAD SHEDDING WITHIN AN ELECTRICAL POWER SYSTEM - A method of initiating the load shedding within an electrical power system comprising an electricity generator with a source impedance Z | 11-01-2012 |
20120330582 | METHOD OF HIGH IMPEDANCE GROUNDFAULT DETECTION FOR DIFFERENTIAL PROTECTION OF OVERHEAD TRANSMISSION LINES - The invention concerns a method of impedance groundfault detection for differential protection of an overhead transmission line in a three-phase high voltage electric power transmission system which comprises many lines ( | 12-27-2012 |
20130041604 | METHOD OF PREDICTING TRANSIENT STABILITY OF A SYNCHRONOUS GENERATOR AND ASSOCIATED DEVICE - A method of predicting transient stability of a synchronous generator and a device for implementing such a method, the device comprising measurement means and calculation means for calculating an information which indicates, before it actually happens, whether the generator slip will be greater than zero or not at the critical phase angle. | 02-14-2013 |
20140095087 | METHOD FOR GENERATING A FAULT SIGNAL - A method generates a fault signal that displays whether an internal transformer fault is present. According to the method, a differential current signal that indicates the difference between the primary current and the secondary current of the transformer, taking into consideration the conversion ratio of the transformer, is ascertained. A plurality of different criteria signals are generated using the differential current signal. At least two individual fuzzy matching functions are assigned to each criteria signal. The fuzzy matching functions are analyzed, thereby generating the fault signal. | 04-03-2014 |
Patent application number | Description | Published |
20130271053 | Method and Apparatus for Checking a Speed System of a Motor-Driven Apparatus - A method for checking a speed system of a motor-driven apparatus is proposed. In the absence of a speed signal, a first aspect provides for a control device to send a test signal via the speed system, the test signal being expected at an input of the control device. If the test signal is not detected, a fault in the speed system is identified. | 10-17-2013 |
20140253105 | METHOD FOR DETERMINING A ROTARY SPEED OF A DEVICE - A device configured for rotary speed measurement includes a speed transmitter on which segments are distributed across a radial circumference and a sensor that is substantially stationary relative to the speed transmitter. A method for determining the rotary speed of the device includes continuously determining pass-through times of all segments relative to the sensor, continuously determining revolution times of the speed transmitter by summing the pass-through times of all segments over a complete revolution, and continuously determining the speed from the revolution times. The revolution times are determined after each pass-through of a segment relative to the sensor and the most current pass-through times of all segments are used for determining each revolution time. Since the time for a full revolution is calculated for each segment respectively, differences in the length of individual segments due to production do not have any negative influence on the calculation of speed. | 09-11-2014 |
20140346994 | Phase Gating Controller and Method for Phase Gating Control - A phase gating controller includes a thyristor/triac having a control terminal and two power terminals, a sampling device for sampling a voltage present across the power terminals of the thyristor/triac and a control device configured to provide a control voltage at the control terminal in order to trigger the thyristor/triac. The control device is further configured to switch off the control voltage at the triggered thyristor and to detect an unexpected turning-off of the thyristor/triac if the sampled voltage exceeds a predetermined threshold value. | 11-27-2014 |
20140361779 | CIRCUIT ARRANGEMENT AND PROCESS FOR DETECTING A SWITCH POSITION - A circuit arrangement for detecting a switch position includes a first node configured to be connected to one phase of a power network, a third node, and a micro-controller. A switch is arranged between the first node and the third node. A resistor is arranged parallel to the switch between the first node and the third node. A connection on the micro-controller is connected to the third node. The micro-controller is programmed to compare a voltage present at the connection against a reference voltage and to determine from this comparison whether the switch is open or closed. | 12-11-2014 |
Patent application number | Description | Published |
20090109260 | INKJET PRINTHEAD COMPRISING NOZZLE PLATE HAVING IMPROVED ROBUSTNESS - An inkjet printhead comprising a reinforced bi-layered nozzle plate structure spanning across a plurality of nozzles is provided. Typically, the nozzle plate structure comprises: a first nozzle plate spanning a plurality of nozzles, the first nozzle plate having a plurality of cavities defined therein; photoresist filling the cavities; and a second nozzle plate covering said the first nozzle plate and the photoresist. | 04-30-2009 |
20090110846 | METHOD OF FABRICATING INKJET PRINTHEAD HAVING PLANAR NOZZLE PLATE - A method of fabricating an inkjet printhead is provided. The method comprises the steps of: (a) providing a partially-fabricated printhead having a first nozzle plate comprised of a first material spanning a plurality of nozzles, the first nozzle plate having a plurality of cavities; (b) filling the cavities with a filler, such that an upper surface of the first nozzle plate and an upper surface of the filler together define a contiguous planar surface; and (c) depositing a second material onto the planar surface to form a second nozzle plate having a planar exterior surface. | 04-30-2009 |
20100134562 | INKJET PRINTHEAD WITH FIRST AND SECOND NOZZLE PLATES - An inkjet printhead with first and second nozzle plates. The first nozzle plate is comprised of a first material spanning a plurality of nozzles. The first nozzle plate has a plurality of cavities filled with a filler such that an upper surface of the first nozzle plate and an upper surface of the filler together define a contiguous planar surface. The second nozzle plate is comprised of a second material disposed on the planar surface. | 06-03-2010 |
20110094103 | METHOD OF FABRICATING INKJET PRINTHED HAVING LOW-LOSS CONTACT FOR THERMAL ACTUATORS - A method of fabricating an inkjet printhead is provided in which a supporting substrate is provided, a conductive layer is deposited and patterned on one side of the supporting substrate, an insulating layer is deposited on the conductive layer, holes are etched through the insulating layer to the conductive layer, metal is deposited in the holes to form metallic vias, an outer surface of the insulating layer and one end of each of the metallic vias are planarized, and a layer of heater material is deposited and patterned on the outer surface to form a heater with a resistive element extending between a pair of contacts. The metallic vias electrically connect the contacts to the conductive layer. | 04-28-2011 |
20110096124 | INKJET PRINTHEAD HAVING LOW-LOSS CONTACT FOR THERMAL ACTUATORS - An inkjet printhead that has a supporting substrate, a conductive layer deposited in a pattern on one side of the supporting substrate, an insulating layer deposited such that the conductive layer is between the insulating layer and the supporting substrate, an ink chamber supported on the supporting substrate such that the conductive layer is between the ink chambers and the supporting substrate, a nozzle in fluid communication with the ink chamber, a heater on the insulating layer configured to vaporize some ink in the ink chamber such that a droplet of ink is ejected through the nozzle, the heater having a resistive element extending between a pair of contacts and, at least one metallic via in each of the contacts respectively, the metallic vias extending through the insulating layer to establish and electrical connection between the conductive layer and the contacts. The insulating layer has a planar surface on which the heater is supported. | 04-28-2011 |
20120062653 | INKJET PRINTHEAD HAVING BILAYERED NOZZLE PLATE COMPRISED OF TWO DIFFERENT CERAMIC MATERIALS - An inkjet printhead includes a bi-layered nozzle plate having a plurality of nozzle apertures. The bi-layered nozzle plate being includes a lower first nozzle plate formed from a first material and an upper second nozzle plate disposed on the first nozzle plate, the second nozzle plate being formed from a second material. The first and second materials are different from each other and are each independently selected from the group consisting of: silicon nitride, silicon oxide and silicon oxynitride. | 03-15-2012 |