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WO/1994/022031A1 |
An arc detector for detecting potentially hazardous arcing in electrical connections comprises detection (72-91) and signal processing (92-98) circuitry for monitoring high frequency noise characteristic of arcing on the power line and d...
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WO/1994/021014A1 |
A protection arrangement for use with HT transformers in neon lighting systems is disclosed. Besides the main HT leads that feed the neon display, a set of auxiliary HT leads (10) from the transformer connect to PCB (11) which has HT tra...
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WO/1994/009240A1 |
An electromotive drive has a first part (10) and a second part (11) offset with respect to the first part (10). In the first part (10) are arranged a control and an evaluation arrangement (12, 13) and in the second part (11) are arranged...
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WO/1994/008379A1 |
It is the aim of the present invention to provide an economical arrangement of digital protective relays also for small installations. The full structure is attained when there are two input transformer panels (1) to power a circuit regi...
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WO/1994/007254A1 |
A memory circuit associated with the housing for a circuit breaker or other switchgear is disclosed. The circuit has a non-volatile memory or a memory with battery back-up and a single input line divided into separate lines of different ...
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WO/1994/007290A1 |
In order to obtain improved triggering properties in a protective device for power supply lines, a protection triggering process is proposed in which at least one signal (i, u) is taken to a filter device (3, 16) and a triggering decisio...
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WO/1994/006203A1 |
This invention relates to a servo waveform display system which stores servo data before and after the occurrence of a servo alarm and displays the data on a display, so as to easily specify the causes of a trouble. Servo motor instructi...
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WO/1994/006026A1 |
A system for detecting a fault in a power line (1) includes, in the power line (1), a first circuit (4) capable of attenuating signals within a first frequency band, which is centered on a first frequency, substantially more than it atte...
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WO/1994/006190A1 |
For use in a trip unit, a switched current shunting arrangement in a circuit interruption tripping system couples the current transformers (A, B, C, G, F) to relatively low voltage and it accumulates a high level of energy quickly at pow...
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WO/1994/003820A1 |
An arc detector for detecting potentially hazardous arcing in electrical connections comprises detection and signal processing circuitry (82, 69-72) for monitoring high-frequency noise on the power line characteristic of arcing and disti...
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WO/1994/001910A1 |
A method and apparatus for detecting high impedance faults and other arcing phenomena in an electrical distribution system. Electrical signals on the distribution system are monitored and a number of frequency components isolated, such a...
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WO/1994/000862A1 |
A trip energy monitor for microprocessor-based trip units includes a Zener diode (CR1), a current-limiting resistor (R1), and an inverting buffer (INV1). The trip energy monitor provides a reference logic signal which is read by a microp...
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WO/1994/000900A1 |
A logic level current and voltage independent restraint system for generating an output drive signal which is independent of an output driver circuit includes a logic level output control circuit (12) and an output driver circuit (14). T...
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WO/1993/021573A1 |
A circuit for reducing a voltage received at an input (3) of the circuit to provide a lower output voltage at an output (5) of the circuit comprises a voltage stabilizer (Zener diode ZD1 and the base-emitter junction of a transistor T2) ...
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WO/1993/016517A1 |
A method and a device for preventing overstabilization of longitudinal differential protections in case of internal faults on power lines, which may take place when a fault situation, which is indicated as an external fault, is in realit...
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WO/1993/013581A1 |
The invention relates to a numerical method which via discrete-time measurements of the secondary current (is(k)) from a current transformer reconstructs the primary current (ipr(k)) and the secondary current (isr(k)) of a saturated curr...
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WO/1993/007597A1 |
The present invention provides a circuit breaker control arrangement that is reliable, accurate and cost-effective to manufacture, install and maintain. This circuit breaker arrangement also provides increased modularity by alleviating t...
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WO/1993/003530A1 |
In order to recognize in time discharge defects that could provoke a fire in power converters (2, 2a), in particular HVDC systems, a signal (S) obtained from the power converter (2, 2a) is subjected to a frequency analysis. When a defect...
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WO/1992/020891A1 |
A motor reverse system for a motor driven vehicle closure member such as a window comprises filters (6 and 7), comparators (8 and 10), a sample and hold circuit (9) and a backoff circuit (11). The backoff circuit is activated to reverse ...
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WO/1992/017941A1 |
In one embodiment, the sampling order of voltage/current data channels (40-45) from a power transmission line is controlled so that the average sampling instant for each channel is the same. In one example involving a six-channel system,...
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WO/1992/015139A1 |
There is provided a circuit (10) that protects the electronic tripping circuitry (14) of a circuit breaker system from external transient high voltages and prolonged high voltage faults. The circuit (10) preferably includes a transzorb (...
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WO/1992/011676A1 |
An addressable relay module (10) is provided for controlling a plurality of relay outputs (14) associated with an electronic circuit breaker system using a trip unit for monitoring system functions or network parameters. The relay module...
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WO/1992/010018A1 |
A solid state circuit interruption arrangement in a distributed power network provides fast and reliable circuit interruption. A common power source (10) provides power to a plurality of loads (12, 14) via respective current paths. A mai...
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WO/1992/009899A1 |
A portable communication device communicates with a circuit breaker trip unit in a cost-efficient, power-effective manner. The portable communication device includes a keypad (10, 12), a display (78), an interface circuit (16) which coup...
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WO/1992/008143A1 |
A principal object of the invention is to detect sparks or arcs (12) in electric circuits (13) or otherwise to detect a spectrum of a broad band of distinct instantaneous radio frequencies in radio frequency noise. The invention rejects ...
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WO/1992/002067A1 |
A current regulator circuit for shunting excess current from a current supply (14) utilizes two separate shunting paths (52, 68) depending on the amount of excess current on the supply line. The first shunting circuit is activated when t...
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WO/1991/019339A1 |
A residual current operated device includes a d.c. power supply (36, 38, 40) and means (82) for inhibiting the supply of d.c. power to the operational part of the device until the magnitude of the d.c. voltage is equal to or greater than...
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WO/1991/018441A1 |
A power supply (1) incorporating a fault detection circuit (3) controlling a circuit breaker (2) is described. The power supply is isolated from relatively large applied DC voltages. This isolation is provided by a coupling capacitor (C1...
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WO/1991/015890A1 |
An arcing fault detector is set up to identify arcing faults and to distinguish them from other disturbances in a circuit. A plurality of electrical conditions are monitored (16, 18) and the conditions are tested against predetermined pa...
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WO/1991/007795A1 |
The disclosed faulted current indicator ignores temporary overloads and transients by inhibiting any trip resulting from an overcurrent signal until a disabling circuit senses that a fuse or circuit breaker has reduced the line current t...
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WO/1991/003826A1 |
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 (317) is used to indicate the status of the ...
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WO/1991/003825A1 |
A fault-powered, processor-based tripping system includes a solenoid (112) for interrupting a current path in response to a trip signal generated by a processor (120). The processor (120) analyzes current provided by a current sensor, by...
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WO/1990/012352A1 |
A power supply has a full-wave rectified signal which is alternately switched between a low impedance path, which does not provide power to the power supply, and a charging path, which does provide power to the power supply. During the m...
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WO/1990/010967A1 |
A solid state circuit protector is comprised of a coil winding (6), a latching type Hall effect device (2), and a solid state switching network including an NPN bipolar junction transistor (10) with a current limiting resistor (4). Other...
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WO/1990/004278A1 |
An electrical fault detection apparatus comprises a detector (3), a threshold detector (4), duration discriminator (5) and warning device (6). Electrical signals radiated due to a fault having a certain frequency, above a certain amplitu...
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WO/1989/009411A1 |
The currents flowing through high voltage conductors in a network or switchyard (14) are monitored by magnetic field sensors (31) in the form of air-cored epoxy-filled coils which are electrostatically shielded by discontinuous shields. ...
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WO/1989/007852A1 |
A monitoring system for an electric motor comprising a temperature sensor (5) for monitoring the operating temperature of a motor, memory means (4) in which is stored the absolute maximum operating temperature and a predetermined maximum...
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WO/1989/002666A1 |
In phase loss detection circuits a false indication can occur doing the starting, stopping and severe load transitions of a three-phase motor. The present phase loss detection circuit solves this problem by using a circuit (33) to detect...
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WO/1988/008217A1 |
The invention relates to an arc relay intended for detecting an arc possibly flashing up at one or more points (A to E) of a switchgear (1) and for extinguishing it by causing a circuit-breaker supplying current to the switchgear to be o...
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WO/1988/005543A1 |
A system (Fig. 3) and method for detecting an abnormality in a network (10) for distributing or transmitting electric power at a predetermined fundamental frequency. The system produces a signal (40) representing the fundamental frequenc...
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WO/1987/007986A2 |
The device consists of a combination of circuits including a first antenna circuit to pick up the electric field created by an electrostatic discharge, which sends an enabling signal, upon systematic suppression of noises on power line b...
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WO/1986/007160A1 |
The control device comprises an antenna (10) for receiving an electro-magnetic radiation emitted by an electric alternating current overhead line. The antenna is connected to an amplifier (20) of which the output (22) is connected to an ...
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WO/1986/006889A1 |
A ground-fault circuit interrupter is provided with an additional current-sensing element (44) that responds to a net value of current through the power wires in an ac circuit. The winding (44) may be wound on a ferromagnetic core of its...
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WO/1986/005651A1 |
Apparatus and a corresponding method for the suppression of switching arcs in direct-current (dc) circuitry. Resistive loads, such as lighting loads (20), supplied with dc through a rectifier circuit (14) and a filter circuit (16) are su...
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WO/1981/001632A1 |
A distance relay apparatus of the type in which signals corresponding to input voltage and current are converted into signals of which suitable ones are selected in accordance with fault conditions and then introduced to a measuring elem...
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WO/1981/001092A1 |
The device allows the control of the output cut off elements, such as contactors breakers, protection switches of motors or similar, and apparatus or installations. The computer is connected, through an analog-digital converter, to at le...
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WO/1980/001442A1 |
It is sought to enhance the reliability of the optical detector in the supervision device of electrical arcs in a high power circuit-breaker insulated with SF6. To this effect a light impulsion external to the circuit-breaker is utilized...
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WO/1979/001033A1 |
Protection arrangement against a solicitation by suppression of the encapsulation (6), in switching devices encapsulated and insulated by pressure gas, distributed within individual sealed compartments. The arc is short-circuited for ext...
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JP7432871B2 |
The problem to be overcome by the present disclosure is to shorten the time it takes to activate an interrupter. A control system (800) is designed to control an interrupter (910). The interrupter (910) is started by a startup current to...
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JP3242312U |
An integrated monitor of power bus status for closed-loop communications. The method includes a microprocessor, a shaping and measuring module, a signal conditioning module, a communication module, and an A/D converter, wherein the shapi...
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