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| Number | Title | Issue Date |
| 7183773 | Method and circuit arrangement for the self-testing of a reference voltage in electronic components To provide a method for the self-testing of a reference voltage in electronic components, by means of which method there is defined a circuit arrangement for a self-test of the reference voltage that can be implemented in the form of an on-chip test, i.e. for which ... | 02/27/2007 |
| 7174255 | Self-processing integrated damage assessment sensor for structural health monitoring A small, lightweight, portable, and inexpensive self-processing integrated damage assessment sensor (SPIDAS) that may be temporarily or permanently attached to a structure for structural health monitoring is provided. The SPIDAS device employs an electromechanical i... | 02/06/2007 |
| 7157896 | Device for locating and identifying circuit breakers The transmitter of the circuit breaker locator draws large amplitude, short duration, phase locked unipolar pulses of current from the power source at a frequency lower than that of the AC line frequency. The audible and visual indicators of the transmitter are trig... | 01/02/2007 |
| 7138924 | Disturbance direction detection in a power monitoring system A system for determining the location of a disturbance event in a power distribution system. More specifically, the present invention provides a system for determining the direction of a disturbance event at the individual meter location and a system for analyzing t... | 11/21/2006 |
| 7068044 | Cable tester A cable tester includes a pretest module that senses activity on a cable and selectively enables testing depending upon the sensed activity. A test module is enabled by the pretest module, transmits test pulses on the cable, measures a refelction amplitude, calculat... | 06/27/2006 |
| 6975312 | Computer system having network connector and method of checking connection state of network cable therefor A computer system having a network connector to which a network cable is connected, including a displaying part displaying a connection state of the network cable; a signal processing part processing a signal inputted through the network connector; and a control par... | 12/13/2005 |
| 6873158 | Circuit protection device with half cycle self test A circuit protection device connected between two lines of an AC power source self checks for an introduced simulated ground fault every half cycle during a period when a trip SCR cannot conduct. If the self check fails, the device is tripped on the next half cycle ... | 03/29/2005 |
| 6844737 | Device and process for detecting an electrical short-circuit, and circuit breaker comprising such a device An electrical short-circuit detection device includes a first signal processing module for receiving a signal representative of an electrical current and supplying a first signal representative of the value of the electrical current and a second signal representativ... | 01/18/2005 |
| 6794883 | Method and system for monitoring winding insulation resistance A method and system for determining the resistance of a winding insulation. The method includes applying a pulsed voltage having a maximum value and a minimum value to the winding insulation. The maximum and minimum values of the pulsed voltage are both negative val... | 09/21/2004 |
| 6674289 | Circuit protection device with half cycle self test A circuit protection device connected between two lines of an AC power source self checks for an introduced simulated ground fault every half cycle during a period when a trip SCR cannot conduct. If the self check fails, the device is tripped on the next ... | 01/06/2004 |
| 6518768 | Arrangement, method, and current measurement device for measuring a current in a conductor A method, an arrangement, and a current measurement device with which a signal that characterizes a fault current in an electrical conductor having at least three conductor ends can be produced in a particularly simple fashion. In particular, a current me... | 02/11/2003 |
| 6518769 | Method and device for the electrical monitoring of an electrode lead of a bipolar high-voltage D.C. transmission system To monitor an electrode lead composed of two lines in a bipolar HVDCT system, a balanced-to-ground pulse formed from an unbalanced-to-ground pulse in push/pull mode is fed into the lines and an actual echo curve is recorded from the echo signals and compa... | 02/11/2003 |
| 6501277 | Automotive harness and audio system analyzer An apparatus for diagnosing automobile audio systems having a system integrity analyzer which includes speaker testing. The speaker testing includes a member for supplying an input to each of the positive and negative leads while supplying ground to the o... | 12/31/2002 |
| 6141093 | Method and apparatus for locating power plane shorts using polarized light microscopy An apparatus and corresponding method for detecting, locating, or defining a short in a thin-film module. The apparatus includes a mechanical fixture supporting the module. A current source provides a current pulse to the module which produces a magnetic ... | 10/31/2000 |
| 5933012 | Device for sensing of electric discharges in a test object A device for sensing electric discharges in a test object with at least two electric connection conductors comprises transducer equipment and evaluation equipment. The transducer equipment comprises at least one transducer for direction-sensitive sensing ... | 08/03/1999 |
| 5912514 | Uninterruptible power supply unit An uninterruptible power supply unit for coupling between an adapter with an adapter connector and an electronic device in accordance with one embodiment of the present invention includes a self-contained housing, a backup power supply, and an output swit... | 06/15/1999 |
| 5847423 | Semiconductor device having a thin film capacitor and a resistance measuring element A semiconductor device having thin film capacitors and containing resistance measuring elementsis disclosed. The thin film capacitor comprises a bottom electrode, a high permittivity dielectric, and a top electrode stacked on an interlayer insulation film... | 12/08/1998 |
| 5796259 | Methods and apparatus for detection of fault direction Apparatus and methods for detecting the direction of a fault in relation to a switch connected between a source and a load are shown to include a voltage sampler for generating samples of the voltage during first and second power cycles. A current sampler... | 08/18/1998 |
| 5760591 | Method of and apparatus for determining an electric wiring state A method of and an apparatus for determining an electric wiring state, having the steps of: feeding at least one pulse voltage signal into one of two lines short-circuited at their two source portions; detecting the pulse voltage signal at two end portion... | 06/02/1998 |
| 5708364 | Cable monitoring system with multiple branch terminations A novel method and apparatus are used for monitoring cables for wear and damage. The system is particularly applicable to a cable system with multiple branch terminations. The cables have detection conductors, for example the metal cable jackets or other ... | 01/13/1998 |
| 5694044 | Simultaneous surge test of two coils of an assembly of series connected coils A circuit detects insulation defects in a coil assembly including a plurality of series connected coils. A first voltage pulse is applied to a first coil of the coil assembly, a second voltage pulse is applied to a second coil of the coil assembly, the fi... | 12/02/1997 |
| 5646462 | DC voltage bypass power system architecture A power plant system architecture includes a plurality of battery polarity switching circuits for providing uninterruptible power/voltage to a plurality of loads, each of which is powered by low frequency AC, and which is also powered by a DC voltage. DC ... | 07/08/1997 |
| 5502375 | Method and apparatus for determining orientation of polarized capacitors The orientation of a polarized capacitor is determined by applying a voltage signal to one of the leads of the capacitor and a reference signal to the other lead. The magnitude of the electric field thus generated by the capacitor is measured. Then the vo... | 03/26/1996 |
| 5365438 | Audible and visual feedback for user stimulated self-test diagnostics A plurality of sensors, such as a door handle lift switch, a headlight switch, and an ignition switch, are normally provided in an automotive electrical system. A master microcontroller normally is coupled to each of these sensors for receiving a signal t... | 11/15/1994 |
| 5347225 | Network monitor and test apparatus An apparatus for monitoring and testing a twisted pair, particularly useful for an Ethernet network. First and second DC currents alternated with one another are applied to both ends of the line, asynchronously. By monitoring the potential on the line, a ... | 09/13/1994 |
| 5325061 | Computationally-efficient distance relay for power transmission lines The relay includes means for obtaining current and voltage samples on the power transmission line for a particular possible fault type. The current sample is multiplied by the replica impedance of the power transmission line, while the voltage sample is m... | 06/28/1994 |
| 5245289 | Circuit breaker interrupter sequence monitor The operation of energized substation circuit breakers in electrical power distribution systems is directly monitored. For each circuit breaker in a multi-phase breaker arrangement, the flow of electrical current is sensed. A signal is then formed for eac... | 09/14/1993 |
| 5087874 | Apparatus and method for locating a short An apparatus can locate a short between a first and second network with a pair of probes, a measurement device and a current source. The measurement device can measure the potential between the probes. The current source can be connected to the first and ... | 02/11/1992 |
| 4884033 | Diagnostic test apparatus for electrical system of automotive vehicle A test module incorporating a unique diagnostic circuit for monitoring the magnitude of electrical parameters existing between an electrical driver such as the electronic control module (ECM) of an automotive vehicle and an electrical load in the vehicle'... | 11/28/1989 |
| 4833414 | Method and apparatus for the identification of a faulty conductor in a multiple supply line A method of and apparatus for determining which if any phase of duplex supply lines wherein each phase w is assigned two conductors w1 and w2. The method and apparatus use an asymmetry value, for example a function of the relationship (output of 9) of the... | 05/23/1989 |
| 4764727 | Circuit continuity and voltage tester A test module incorporating a unique diagnostic circuit for monitoring the magnitude of electrical parameters existing between an electrical driver such as the electronic control module (ECM) of an automotive vehicle and an electrical load in the vehicle'... | 08/16/1988 |
| 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 |
| 4562401 | Circuit arrangement and method for fault locating in conjunction with equipment for the trunk feeding of electrical loads Circuit arrangement for fault locating in conjunction with equipment for the trunk feeding of electrical loads by means of dc series feeding in which the trunk supply circuit is equipped with cross branches conducting only for currents in the direction of... | 12/31/1985 |
| 4458198 | Fault indicator having a remote test point at which fault occurrence is indicated by change in magnetic state A fault indicator for use in conjunction with components of a power distribution system contained within a protective enclosure includes a magnetic test point on the exterior surface of the enclosure for indicating the occurrence of a fault in associated ... | 07/03/1984 |
| 4445085 | Fault location methods and apparatus using current pulse injection A probe for sensing direction of flow of an injected current pulse along a conductor of a circuit under test is linked to an ATE, to be triggered to inject the pulse during a test sequence at a step previously found by the ATE to establish a faulty state ... | 04/24/1984 |
| 4438403 | Fault indicator with combined trip and reset winding A fault indicator for indicating the occurrence of a fault current in a power distribution system includes a test-point-mounted circuit module and a remotely-mounted indicator module. The indicator module incorporates a bidirectional magnetic winding and ... | 03/20/1984 |
| 4385271 | Fault monitoring by detecting a polarity difference In a system for continuously monitoring partial discharge in high voltage electrical equipment thereby to give advance warning of impending breakdown of solid-insulated components, means are provided to distinguish electrical signals indicative of partial... | 05/24/1983 |
| 4377834 | Multiphase blocking circuitry for electrical power supply networks In circuitry for generating tripping and blocking signals for the protection of electrical power supply network components as a result of the occurrence of faults, the blocking signals are selected from each phase of the electrical power supply network to... | 03/22/1983 |
| 4377782 | Fault location methods and apparatus using current pulse injection A probe for sensing direction of flow of an injected current pulse along a conductor of a circuit under test is linked to an ATE, to be triggered to inject the pulse during a test sequence at a step previously found by the ATE to establish a faulty state ... | 03/22/1983 |
| 4351011 | Directional wave detector apparatus In directional wave detector apparatus for electrical power line relay protection devices determining the direction to a fault, the current and voltage of the travelling waves generated by a fault point are combined at a measuring point and the sign of th... | 09/21/1982 |
