Power system and synchronizing breakers for a variable speed generator motor system
Patent 4952852 Issued on August 28, 1990. Estimated Expiration Date: 
August 9, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 9, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2735976 3581179 3660721 3873887 Digital logic control system for three-phase submersible pump motor Power interruption protection system for electric motors Multiple static trip circuit breaker coordination Electrical short-cicruit monitoring arrangement for variable-speed, three-phase motors, including their feed lines Patent #: 4682263 InventorsAssigneeApplicationNo. 229995 filed on 08/09/1988US Classes:318/140, GENERATOR-FED MOTOR SYSTEMS HAVING GENERATOR CONTROL318/434, LIMITATION OF MOTOR LOAD, CURRENT, TORQUE OR FORCE (E.G., PREVENTING OVERLOAD)361/31CurrentExaminersPrimary: Shoop, William M. Jr.Assistant: Wysocki, Jonathan Attorney, Agent or FirmForeign Patent References
International ClassH02H 007/08Foreign Application Priority Data1987-08-14 JPAbstractA generator-motor apparatus with economical protection measures for use in a variable speed pumping-up electric power plant, having a main transformer, a secondary winding of which is coupled to an electric power system, a power system breaker connected to a primary winding of the main transformer, a syncronizing breaker connected in series with the power system breaker, a generator-motor, a rotor of which is mechanically coupled to the pump-turbine and an armature winding of which is connected to the power system through the synchronizing breaker, the power system breaker and the main transformer, and an excitation circuit, including a frequency converter for supplying a field winding of the generator-motor with AC voltage of the variable frequency and a converter transformer for feeding the converter, which is branched from a junction of the power system breaker and the synchronizing breaker.Field of SearchNonresponsive or less responsive for limited periodsPlural, diverse conditions or with time-delay means With means for effecting other motor interconnections Plural, diverse motor controls for different motors Control of both armature (or primary) and field (or secondary) circuits Parallel connected motors GENERATOR-FED MOTOR SYSTEMS HAVING GENERATOR CONTROL Automatic generator control and/or with time-delay means Speed or frequency of generator or its drive means Control of both the generator and the circuit to the motor LIMITATION OF MOTOR LOAD, CURRENT, TORQUE OR FORCE (E.G., PREVENTING OVERLOAD) Motor protective condition responsive circuits Current and temperature With time delay Current and voltage Current Feeder protection in distribution networks With current responsive fault sensor Ground fault protection With more than two wires With bimetallic sensor Voltage responsive | |
