DAVID LEE SWINDLER
Pilots at Wiltshire Dr, Murfreesboro, TN

2002008, Jun 27, 2002

Dec 22, 2000

09/748683

David Swindler - Murfreesboro TN, US
Henry Zylstra - Alburnett IA, US
Mitchell Lampley - Thompson Station TN, US

H02H003/32

361/044000, 361/042000

A ground fault protection system and method for implementing such is provided for protecting an electrical power distribution system having multiple sources and multiple grounds. A set of current transformers are connected to an interface unit which in turn is connected to a ground fault trip function for a circuit breaker. The interface unit has an output with a low impedance, and the outputs of multiple interface units can be connected in series and feed a single ground fault trip function; thereby tripping the circuit breaker on a ground fault detected by any set of current transformers connected to one of the interface units. Another embodiment utilizes multiple, independent ground fault trip functions in a single circuit breaker. Each ground fault trip function is connected to a set of current transformers, and the circuit breaker will trip if any connected set of current transformers detects a ground fault. This embodiment involves a system whereby one circuit breaker is tripped under ground fault conditions using one signal from either of two or more inputs from different groups of sensor circuits. A method is disclosed that includes the steps of sensing the current at various points in the distribution system, monitoring the sensed current for a ground fault, determining which breakers need to be tripped for a detected ground fault, and tripping those breakers.

5751524, May 12, 1998

Mar 10, 1997

8/814302

David L. Swindler - Murfreesboro TN

Square D Company - Palatine IL

H02H 300

361 42

An improved ground fault protection system is provided for protecting an electrical power distribution system having multiple sources and multiple grounds. In accordance with a preferred embodiment, an electrical power distribution circuit having a primary electrical circuit for distributing electrical power from a plurality of sources to a plurality of loads is provided with a ground fault protection circuit magnetically coupled to the primary circuit. The primary electrical circuit includes conventional main and tie buses for distributing power to the loads and switches or circuit breakers for interrupting power from flowing in the buses. The ground fault protection circuit includes current sensors, tripping functions or ground fault relays associated with each circuit breaker and a novel use of an auxiliary transformer. When a ground fault occurs, the ground fault protection circuit is capable of sensing and determining the specific bus in which a ground fault condition exists. It then selectively sends a trip current generated by the associated current sensor only to the proper tripping functions for tipping the appropriate circuit breakers in the affected bus in order to isolate the ground fault; this avoids unnecessary tripping of circuit breakers in bus portions which are not affected by the ground fault.

6188298, Feb 13, 2001

Dec 30, 1998

9/223051

Philip J. Hopkinson - Charlotte NC
David L. Swindler - Murfreesboro TN

Square D Company - Palatine IL

H03H 706

333172

The present invention relates to a transformer having a conductive element spiraling along the length of an insulated wire of the coil. When formed into plurality of adjacent turns, the conductive element couples one of the plurality of turns with another of the plurality of turns. The conductive element increases the series capacitance of the transformer circuit. A resistive element may also spiral along the length of the insulated wire to couple one of the plurality of turns with another of the plurality of turns. The resistive element not only increases the series capacitance of the transformer, but also increases the series conductance of the transformer circuit. The increase in the series resistance increases the dampening of the switching resonance.

2002007, Jun 27, 2002

Dec 22, 2000

09/748688

David Swindler - Murfreesboro TN, US

H02M007/00

323/908000

A power factor correction circuit for controlling the inrush current for a power factor correcting capacitor bank in an electrical power distribution system. The circuit includes an inrush current limiting device in series with the capacitor bank. The inrush current limiting device, such as a thermistor, varies its resistance in an inverse relationship to its temperature.

5477017, Dec 19, 1995

Mar 15, 1994

8/213326

David L. Swindler - Murfreesboro TN
Gary T. Jones - Antioch TN

Square D Company - Palatine IL

H01H 900

200 50AA

A racking assembly is provided for racking a circuit breaker into and out of electrical switchgear having a cell adapted to receive the circuit breaker and a cell door for enclosing the circuit breaker within the cell, the racking assembly includes a shaft having a first end adapted to be coupled to the circuit breaker and a motor coupled to a second end of the shaft for applying a rotational torque to the shaft. An anti-rotation assembly is coupled to the motor for preventing the motor from rotating when it is applying the rotational torque to the shaft.