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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 5253180 | Apparatus and method for diagnosis of power appliances A power appliance diagnosis apparatus includes a plurality of detectors provided on outer surfaces of gas-insulated casings of a power appliance for detecting the state of an insulating function and/or a current conduction function of the power appliance,... | 10/12/1993 |
| 5160926 | Display transducer apparatus A display transducer adapter for obtaining and displaying power system information from a protective relay. The information includes watt, voltage, current, reactive power, and fault location information. The information may be converted from a digitized ... | 11/03/1992 |
| 5089928 | Processor controlled circuit breaker trip system having reliable status display A fault-powered, processor-based circuit breaker tripping system employs a reliable low power trip indicator circuit that is normally powered from the tripping system. A liquid crystal display is used to indicate the status of the system, and a battery is... | 02/18/1992 |
| 5072403 | Equipment for and methods of locating the position of a fault on a power transmission line An equipment for locating the position of a fault (9) on a power transmission line (7) between two ends (11,13) of the line (7) comprising: a voltage (15A,B) and a current (17A,B) sensor located at each end (11,13) of the line (7) for deriving signals rep... | 12/10/1991 |
| 4985843 | Digital locator A digital locator in which a resistance value R and an inductance value L are determined using an improved approximation which remains precise over a wider frequency range based on waveform sampling at an odd or even number of time intervals.... | 01/15/1991 |
| 4868507 | Microcomputer controlled resistance fault locator circuit A resistance fault locator circuit having a digitally controlled current split circuit, an error amplifier and a programmed microcomputer plus a switching means for establishing several modes of operation of the circuit for determining the distance to a f... | 09/19/1989 |
| 4857854 | Digital fault locator A digital fault locator of this invention comprises a memory for storing input electric amount from a system and a plurality of digital filters having different filter functions to which electric amounts are supplied from the memory. A fault location is d... | 08/15/1989 |
| 4857833 | Diagnosis of faults on circuit board A method of determining which of a plurality of electrical devices connected to a node of a circuit under test is causing a failure at that node by causing individual devices to drive the node one device at a time, taking passive voltage measurements at t... | 08/15/1989 |
| 4797805 | Fault location in a power supply network A method for location of a fault on a transmission line in a network for distribution and transmission of electric power uses a travelling wave model of the transmission line positioned in measuring stations (P, Q) at either end of the transmission line, ... | 01/10/1989 |
| 4766549 | Single-ended transmission line fault locator A system for locating faults on a transmission line by taking measurements at only one end of the line.... | 08/23/1988 |
| 4719580 | Detection and location of a fault point based on a travelling wave model of the high voltage transmission line A method and a device for distance protection and location of a fault point on a transmission line based on voltage waves emitted from a measuring point towards a fault point and corresponding waves reflected from a fault point, which are included in a tr... | 01/12/1988 |
| 4698517 | Power supply source control system A system-power-supply-source controller is used for controlling and monitoring the operations of a plurality of power supply sources associated with a plurality of logical units. The logical units each comprise power supply control units. Separate and ind... | 10/06/1987 |
| 4689709 | Digital distance relay In a digital distance relay, the distance measuring operation is performed only regarding the phase on duty in the third step if there is no fault, and it is performed regarding either the third and first steps or the third and second steps if a fault is ... | 08/25/1987 |
| 4633421 | Method for transposing time measurements from one time frame to another A method for transposing the time of an event as read at a remote station with one clock to the time frame of another clock at a master station when the clocks are not synchronized and are of insufficient accuracy to provide measurements to within a few m... | 12/30/1986 |
| 4630270 | Method for identifying a faulty cell in a chain of cells forming a shift register A method for identifying the rank of a faulty cell in a chain of cells forming a shift register in a functional element, each cell including a pair of latches acting as master-slave elements having data inputs, clock inputs, and data outputs, each cell be... | 12/16/1986 |
| 4630228 | Transmission line analyzer for automatically identifying the severities and locations of multiple mismatches A transmission line analyzer for automatically identifying the severities and locations of multiple mismatches generates a ripple waveform which is digitally analyzed by a fast fourier transform method. Foreign and harmonic signals are rejected, and retur... | 12/16/1986 |
| 4618933 | Method for detecting a fault or also the direction of a fault in electric lines and means for executing this method A method and apparatus for detecting a fault and also the direction of a fault in electric lines, wherein voltage (Su) and current step signals (Si) corresponding to the transient components in the line voltage and line current are derived; the instantane... | 10/21/1986 |
| 4612498 | Induction furnace fault locator The specification discloses a computerized monitor for a coreless induction furnace. The monitor includes a first potential transformer connected across the coil and a second potential transformer connected between one end of the coil and an electric grou... | 09/16/1986 |
| 4591992 | Method and system for identifying the direction of a fault in a power line In direction identification for a close-in fault when the voltage becomes very small, direction of the fault is determined from the discriminant D given by: where Vk1, Vk3 represent sample values of the voltage at time points k1, k3,... | 05/27/1986 |
| 4577279 | Method and apparatus for providing offset compensation An apparatus and method for removing a transient exponential noise signal from a sinusoidal signal. The effects of the transient are removed by sampling the sinusoidal signal, averaging the transient over a time interval corresponding to an integral numbe... | 03/18/1986 |
| 4570231 | Fault finder A fault finder for locating faults along a high voltage electrical transmission line. Real time monitoring of background noise and improved filtering of input signals is used to identify the occurrence of a fault. A fault is detected at both a master and ... | 02/11/1986 |
| 4559491 | Method and device for locating a fault point on a three-phase power transmission line A fault point in a line section of a three-phase power transmission line, is determined by measuring currents and voltages at a measuring point arranged adjacent the near end of the section. The type of fault (single-phase/multi-phase ground fault/phase-t... | 12/17/1985 |
| 4475150 | Coordinated load commutated inverter protection system A fault protective system for a load commutated inverter motor drive including an AC to DC source side converter coupled from an AC source to a DC to AC load side converter via a DC link circuit and wherein the load side converter supplies AC power of var... | 10/02/1984 |
| 4455612 | Recursive estimation in digital distance relaying system Digital distance relaying of a three-phase electric power transmission line depends on accurate estimation of the postfault voltage and current phasors during the first postfault electrical cycle, when the line voltages and currents are corrupted by noise... | 06/19/1984 |
| 4351030 | Automatic repair apparatus and method for insulated wire A method for repairing faults or defects in the insulation of insulated wire is disclosed together with an apparatus for operation of the method. The method comprises passing insulated wire to be tested for insulation faults at high speed through a fault ... | 09/21/1982 |
| 4322805 | Electrical survey method and apparatus An apparatus for making electrical surveys of structures contained in an electrolyte by measuring potential difference therebetween includes an electrode to contact the electrolyte proximate the structure, a wire electrically and mechanically connecting t... | 03/30/1982 |
| 4313169 | Fault detecting system for locating a fault point with a fault resistance separately measured At an end (11) of a power transmission line (10), a fault detecting system monitors variations resulting from a fault in voltage and current being transmitted through the line and calculates the distance between the end and location (20) of the fault by t... | 01/26/1982 |
| 4107778 | Digital fault-location calculation system Provided is a digital fault-location calculation system which comprises first means for obtaining data including voltage and current information of a power transmission system subjected to fault-location calculation, a computer, and second means coupled b... | 08/15/1978 |
| 4063160 | Method and apparatus for locating a fault on a line by means of travelling wave signals A method of and apparatus for locating a fault on a line in which there is formed from the voltage and current at a test or measuring location at least one signal (travelling-wave signal) associated with a travelling wave on the line and its variation wit... | 12/13/1977 |
| 3983377 | Method and apparatus for detecting a fault location at an electrical conductor A method of, and apparatus for, detecting a fault location at an electrical conductor which entails forming a wave voltage and therefrom together with a measurement voltage a first wave function and a second wave function. Weighted functions are formed by... | 09/28/1976 |
| 3931502 | Method and apparatus for localization of failures on electrical lines At a measuring point serving at least one adjacent line segment instantaneous values of current and voltage are measured in sequential pairs, either continuously or at intervals by delaying these values by discrete amounts of delay corresponding to twice ... | 01/06/1976 |
