| Patents for H02H 7 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions (32,726) |
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| 12/14/1988 | EP0294887A2 Driving a semiconductor device |
| 12/14/1988 | CN88103187A Control apparatus for brush-less motor |
| 12/13/1988 | US4791375 Apparatus for detecting degradation of an arrester |
| 12/06/1988 | CA1246146A1 Dual current transformer current sensing method and sensor |
| 12/06/1988 | CA1246129A1 Protected refrigerator compressor motor systems and motor protectors therefore |
| 11/30/1988 | CN88204220U Autoprotective electric source device for electrophoresis |
| 11/30/1988 | CN88103459A Electronic protecting instrument for ac load |
| 11/29/1988 | US4788619 Use in an electrical power system with a circuit breaker |
| 11/23/1988 | EP0292430A1 Process and device for the overvoltage protection of an electrical conductor system |
| 11/23/1988 | CN88203069U Protector for motor phase breaking |
| 11/22/1988 | US4786822 Load control system |
| 11/22/1988 | US4785712 Hydraulic operating apparatus for electric circuit breaker |
| 11/22/1988 | CA1245316A1 Compact resistor assembly |
| 11/17/1988 | EP0290914A1 Status signal generated for indicating the by-pass transition in a device for high voltage direct current power transmission |
| 11/17/1988 | DE3812733A1 Short-circuit protection circuit |
| 11/16/1988 | CN88204274U Emergency protective device for loss of phase and short circuit |
| 11/16/1988 | CN86204312U Multifunction electric motor protection circuit breaker |
| 11/15/1988 | US4785249 Method for measuring distance in digital distance relays |
| 11/15/1988 | CA1244878A1 Method of, and apparatus for, half-cycle average or r.m.s. load voltage control |
| 11/15/1988 | CA1244861A1 Electrical components incorporating a temperature responsive device |
| 11/09/1988 | EP0289645A1 Infrared signaling system for detecting a predetermined condition of a high tension device |
| 11/02/1988 | EP0288729A1 Quench extending device for a supraconducting magnet |
| 11/02/1988 | EP0288642A2 Real load unbalance protection circuit and method |
| 11/02/1988 | CN88102486A Current source power converting apparatus with overvoltage protection |
| 11/01/1988 | US4782421 Electrical supply line protection apparatus |
| 10/26/1988 | CN87209624U Automatic protective device for safety operation of amotor |
| 10/25/1988 | US4780908 Method and apparatus for signal transmission regulation in differential protection |
| 10/25/1988 | US4780656 Drive and protection system for variable speed motor |
| 10/19/1988 | EP0286951A1 Monitoring circuit for polyphase convertor |
| 10/19/1988 | CN88203398U Protector for phase breaking and lacking of three-phase motor |
| 10/19/1988 | CN88100138A Safety device for alternating current elevator |
| 10/19/1988 | CN87217191U Portable verifier for gas relay |
| 10/19/1988 | CN87209691U Protection switch with temp. and current relay |
| 10/19/1988 | CN87100595A Double adaptive complex impedance ground distance protection |
| 10/18/1988 | US4779051 Coupling unit for the operative monitoring of the high-voltage wingings and the connected output leads in electric high-voltage machines and apparatus, by means of partial discharge determination and breakdown spark measurement |
| 10/18/1988 | US4779031 Motor system |
| 10/12/1988 | CN87102532A Dc-to-ac converter circuit with serial silicon controlled rectifiers |
| 10/11/1988 | US4777554 Method and apparatus for detecting charger abnormality |
| 10/11/1988 | US4777518 Semiconductor device including gate protection circuit with capacitor under input pad |
| 10/11/1988 | US4777437 Monitoring system for detecting quench of superconductive coils |
| 10/05/1988 | EP0285583A1 Device for protecting an integrated circuit against overload and short circuit currents |
| 10/05/1988 | EP0285513A1 Devices for the detection of the transition into the normal state of a supraconducting winding, in particular of an electric generator, and for protecting such a winding |
| 10/05/1988 | EP0284869A1 Power supply circuit using DC series supply |
| 10/05/1988 | CN88101557A 晶闸管阀 Thyristor valve |
| 10/04/1988 | US4775924 Inverter commutation failure prevention method and apparatus |
| 10/04/1988 | US4775245 Multi-phase electronic temperature controller |
| 09/28/1988 | EP0283895A1 Electrical protection apparatus |
| 09/28/1988 | CN87215041U Automatic testing and cut-out device for line short fault |
| 09/21/1988 | EP0283268A1 An overvoltage protection device for thyristor valve |
| 09/20/1988 | US4772978 Transformer protection system |
| 09/20/1988 | US4772977 System for protection of electrical machines against damage from residual voltage effects |
| 09/15/1988 | DE3707336A1 Arrangement for supplying at least one AC or DC motor |
| 09/15/1988 | DE3706932A1 Device for protecting against shorts to earth for rectifier-fed synchronous machine exciter device in a potential free arrangement |
| 09/07/1988 | EP0280759A1 Arrangement for electric energy cables for protection against explosions of gas and/or dust/air mixtures, especially for underground working |
| 09/07/1988 | CN87207461U Protective arrangement for phase interruption |
| 09/06/1988 | US4769752 Power supplies for electrical and electronic equipment |
| 08/31/1988 | EP0280382A2 Inverter control method and apparatus |
| 08/30/1988 | US4768125 Protective device for an electric motor |
| 08/30/1988 | US4767974 Automatic universal head |
| 08/30/1988 | US4767970 Dynamic brake control for a tape drive system |
| 08/30/1988 | CA1241424A1 Power distribution system |
| 08/24/1988 | EP0279023A2 Compressor terminal block and overload protector assembly |
| 08/23/1988 | US4766549 Single-ended transmission line fault locator |
| 08/23/1988 | US4766364 Parallel power systems |
| 08/23/1988 | US4766360 Induction generator/motor system |
| 08/18/1988 | DE3702970A1 Schutzeinrichtung fuer elektrisch betriebene geraete Protective device for electrically operated equipment at |
| 08/17/1988 | EP0277961A1 Capacitor circuit interruption |
| 08/17/1988 | CN87217095U Three-phase motor protector for phase failure and voltage unbalance |
| 08/17/1988 | CN87204387U Phase break and overcurrent protector of motor |
| 08/16/1988 | US4764838 Regulated alternator with positive fault related shut down apparatus |
| 08/16/1988 | US4764837 Superconductive circuit for controlling quench events |
| 08/16/1988 | CA1240780A1 Three terminal current differential protective relay |
| 08/16/1988 | CA1240778A1 Safety mechanism for electrical power line |
| 08/11/1988 | WO1988005974A1 Protective device for electrically driven apparatus |
| 08/11/1988 | DE3703218A1 Current limiting for a three-phase invertor which is operated using a servo controller (follow-up controller) |
| 08/10/1988 | CN87216941U Multi-functional integration protector for threephase motor |
| 08/10/1988 | CN87216391U Multi-purpose electronic protector for three-phase motor |
| 08/10/1988 | CN87203408U Open-phase protective apparatus for three-phase ac motor |
| 08/09/1988 | US4763238 Extended overload protection circuit for a switch mode power supply having cycle detector, memory and flip-flop inhibition |
| 08/09/1988 | US4763221 Superconducting magnet apparatus with emergency run down unit |
| 08/09/1988 | CA1240364A1 Device for generating a signal indicative of a fault in an electrical circuit connected to a power mains |
| 08/03/1988 | EP0276401A2 Mechanically operated pressure switch having solid state components |
| 08/03/1988 | EP0276400A2 Mechanically operated pressure switch having solid state components |
| 08/03/1988 | EP0276296A1 Current-limiting circuit. |
| 08/03/1988 | CN87215945U Overcurrent protector for motor |
| 08/03/1988 | CN87209091U Star resistance type phase failure protector for motor |
| 08/03/1988 | CN87206874U Switchless element phase failure protector |
| 08/03/1988 | CN87107988A Improved current fault detection method |
| 08/03/1988 | CN86108614A Multifunctional automatic contactor with distinct state indication |
| 08/02/1988 | US4761726 Variable speed constant frequency power system with boost converter auxiliary output |
| 08/02/1988 | US4761703 Rotor fault detector for induction motors |
| 08/02/1988 | US4761702 CMOS latch-up recovery circuit |
| 08/02/1988 | US4761593 Device for controlling motor driven antennas for vehicles |
| 08/02/1988 | US4761592 Electric motor with overload protection circuit |
| 07/28/1988 | DE3743453A1 Circuit arrangement for short-circuit protection of a semiconductor amplifier element |
| 07/27/1988 | EP0275779A1 Directional relay protective device consisting of several types |
| 07/27/1988 | EP0275633A1 Control of multiphase ac motors |
| 07/27/1988 | CN88210030U Three-phase protector for losing phase |
| 07/27/1988 | CN87208743U Pulse modulation type governor for electric bicycle |
| 07/27/1988 | CN86108602A Multifunctional explosionproof-type circuit protector |