| 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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| 02/14/1978 | US4074176 Motor protector |
| 02/07/1978 | US4072997 Overtemperature protective circuit for switching devices |
| 01/31/1978 | US4071900 Control device for an inverted rectifier |
| 01/31/1978 | US4071875 Detector apparatus |
| 01/31/1978 | US4071871 Motor protector circuit |
| 01/17/1978 | US4069445 Bypass control for a solid state switching device |
| 01/10/1978 | US4068294 Circuit for detecting a missed commutation in an inverter |
| 01/10/1978 | US4068277 Overvoltage protector |
| 01/10/1978 | US4068275 Ground fault protective apparatus and method |
| 01/03/1978 | US4066954 Frequency converter |
| 12/27/1977 | US4065804 Electronic control system for motors and the like |
| 12/27/1977 | US4065803 Electronic device for preventing undesirable effect resulting from voltage fluctuation |
| 12/27/1977 | US4065802 Inverter circuit for induction heating cooking ovens with a protection device |
| 12/20/1977 | US4064546 Protection circuits |
| 12/20/1977 | US4064454 Corona discharge detecting device |
| 12/13/1977 | US4063307 Direct current power converter with start-up and protection circuits |
| 12/13/1977 | US4063302 Protection arrangement for an inverter |
| 12/13/1977 | US4063301 Half-wave detector for alternating current static switches |
| 12/13/1977 | US4063166 Method for locating a fault on a line near to a measuring location with the aid of substitute signals |
| 12/13/1977 | US4063165 Apparatus for localization of a line fault by using traveling wave signals especially for locating faults both near and far from a measuring location |
| 12/13/1977 | US4063164 Method and apparatus for detection of short circuits by phase monitoring traveling wave signals |
| 12/13/1977 | US4063163 Apparatus for localization of a line fault through the use of predeterminably shiftable reference location |
| 12/13/1977 | US4063160 Method and apparatus for locating a fault on a line by means of travelling wave signals |
| 12/06/1977 | US4061963 Load tap changer system |
| 12/06/1977 | US4061955 Multi-cell battery protection system |
| 11/29/1977 | US4060841 Motor protector for three-phase motors |
| 11/15/1977 | US4058758 Cooperative primary and secondary current limiting to selectively limit aggregate and individual current outputs of a multi output converter |
| 11/15/1977 | US4058757 Well pump-off controller |
| 11/08/1977 | US4057842 Current regulation system for three-phase load |
| 10/18/1977 | US4054943 Circuit arrangement for the automatic de-excitation of a hysteresis motor |
| 10/18/1977 | US4054933 Saturating time-delay transformer for overcurrent protection |
| 10/18/1977 | US4054932 Over-current protective apparatus for a power circuit |
| 10/11/1977 | US4053816 Protection means for objects included in electrical power supply networks |
| 10/11/1977 | US4053786 Transducer out of range protection for a steam turbine generator system |
| 10/04/1977 | US4052659 Overload protection system for power inverter |
| 10/04/1977 | US4052652 Apparatus for tightening and releasing a pressure vessel clamping nut |
| 09/27/1977 | US4051545 Apparatus for overvoltage protection of a direct converter in the rotor circuit of an asynchronous machine |
| 09/27/1977 | US4051427 Supervisory system for detecting torsional oscillation in the shaft of a rotating electro-mechanical system |
| 09/13/1977 | US4048663 Solid state overload relay transformer circuit |
| 09/13/1977 | US4048662 Device for avoiding accidents when closing a movable panel, for example the panel of an electrically controlled sliding roof |
| 09/13/1977 | US4048584 Input protection circuit for cmos oscillator |
| 09/13/1977 | US4048553 Interruption-free power supply |
| 09/06/1977 | US4047235 Current limit and overcurrent cut off system |
| 09/06/1977 | US4046512 Device for indicating overheating in generators |
| 09/06/1977 | US4045887 Switching regulator control circuit |
| 08/30/1977 | US4045742 High voltage shutdown circuit responsive to excessive beam current and high voltage |
| 08/30/1977 | US4045715 Operator motor control |
| 08/30/1977 | US4045682 Phase reversal protection system |
| 08/23/1977 | US4044295 Over-voltage interrupt for a phase controlled regulator |
| 08/23/1977 | US4044288 Temperature-responsive motor restart limiter |
| 08/23/1977 | US4044287 Circuit for energizing the electromotor driving a blower |
| 08/16/1977 | US4042966 Motor control circuit |
| 08/16/1977 | US4042965 Power interruption safeguard apparatus |
| 08/16/1977 | US4042964 Motor protection circuit |
| 08/16/1977 | US4042963 Reduction of mechanical stresses on turbosets upon occurrence of three-pole mains short circuits near generators |
| 08/16/1977 | US4042872 Static converter having partially gapped transformer |
| 08/16/1977 | US4042871 Conversion system with overcurrent protection and start-up circuitry |
| 08/09/1977 | US4041543 Field protector for synchronous machines |
| 08/09/1977 | US4041542 Control apparatus for two-speed compressor |
| 08/09/1977 | US4041365 Circuit for detecting a malfunction in an inverter |
| 08/09/1977 | US4041357 High voltage protection circuit |
| 08/02/1977 | US4040117 Fast operating overload switching circuit for universal motors |
| 08/02/1977 | US4039928 Electrical operating circuit having semiconductor device junction temperature monitoring |
| 07/26/1977 | US4038584 Protective arrangement for dependent switching circuits |
| 07/26/1977 | US4038061 Air conditioner control |
| 07/19/1977 | US4037271 Switching regulator power supply |
| 07/19/1977 | US4037138 Zero-phase sequence protective device for faults within armature of three-phase synchronous machine |
| 07/12/1977 | US4035692 Resistor protection systems |
| 07/12/1977 | US4035603 Fault detector system for starting plasma arc working apparatus |
| 07/05/1977 | US4034415 Thermal protection for D.C. motors |
| 06/28/1977 | US4032860 Radio frequency power generator having adjustable stabilized output level and fail-safe control circuits |
| 06/14/1977 | US4030012 Amplifier malfunction detector |
| 06/14/1977 | US4030005 Brushless d.c. motor having rotor position-dependent control means |
| 06/07/1977 | US4028737 Transient voltage protection circuit |
| 06/07/1977 | US4028736 Motor protection circuit unit |
| 06/07/1977 | US4028610 Inverters supplying a high frequency alternating current |
| 06/07/1977 | US4028593 Motor control circuit |
| 06/07/1977 | US4028592 Means for increasing the stability in high-voltage power supply networks |
| 06/07/1977 | US4028591 Relay contact protector |
| 05/31/1977 | US4027221 Control circuit with time delay |
| 05/31/1977 | US4027204 Phase failure detection circuit for multi-phase systems |
| 05/31/1977 | US4027202 Voltage protection circuit |
| 05/24/1977 | US4025845 System with photocouplers for automatic checking of operating thyristors |
| 05/24/1977 | US4025836 Protective system against commutation failure in a chopper circuit |
| 05/24/1977 | US4025833 Torque demand thermal switch |
| 05/24/1977 | US4025820 Contactor device including arc supression means |
| 05/17/1977 | US4024454 Holding circuit for static convertor valves |
| 05/17/1977 | US4024451 Stabilized DC power supply device |
| 05/17/1977 | US4024439 Protection of polyphase equipment |
| 05/17/1977 | US4024437 D.C. power supply circuit |
| 05/10/1977 | US4023087 Overvoltage protection for a direct current transmission |
| 05/10/1977 | US4023076 Discharge gap device |
| 05/10/1977 | US4022598 Air conditioning |
| 05/03/1977 | US4021704 Phase sequence correcting system for three-phase AC power |
| 05/03/1977 | US4021702 Arrangement for detecting deficient operational capability of vacuum switching vessels |
| 05/03/1977 | US4021700 Digital logic control system for three-phase submersible pump motor |
| 04/26/1977 | US4020404 System for controlling motor speed |
| 04/26/1977 | US4020397 Parallel transistor protection circuit |
| 04/26/1977 | US4020396 Time division multiplex system for a segregated phase comparison relay system |
| 04/26/1977 | US4019315 Gas turbine power plant control apparatus including a temperature reset starting control system and an ignition pressure control system |