1
Merlin E Burkum, Charles M Gabriel: Apparatus and method for measuring battery condition. Commonwealth Edison Company, Willian Brinks Olds Hofer Gilson & Lione, September 29, 1987: US04697134 (186 worldwide citation)

A testing device measures the impedance of secondary cells that form a battery, such as a lead acid battery, while the battery is in a float charge condition and connected to an active electrical load. The impedance measurement is made at a frequency selected to be different from those frequencies o ...


2
Charles M Gabriel, Merlin E Burkum: Apparatus and method for utilizing polarization voltage to determine charge state of a battery. Commonwealth Edison Company, Willian Brinks Olds Hofer Gilson & Lione, May 25, 1993: US05214385 (146 worldwide citation)

An apparatus for measuring charge state of a battery having multiple cells includes a transmitter that is connected to the battery to apply a test signal across the battery. This test signal is preferably a continuous square wave signal having a frequency less than 3 Hz. The test signal alternates b ...


3
Chang E Kang, L Alan Lowry, Merlin E Burkum: Apparatus and method for locating ground faults. Commonwealth Edison Company, Emrich & Dithmar, October 8, 1985: US04546309 (27 worldwide citation)

An apparatus for locating ground faults on direct current control systems includes a low frequency current generator having a variable output, a Hall-effect current probe for detecting the low frequency current produced by the generator, a filter and amplifier connected to the output of the Hall-eff ...


4
Merlin E Burkum, Timothy M O Regan: Apparatus for identifying defective electric power distribution capacitors. Commonwealth Edison Co, Emrich Lee Brown & Hill, January 10, 1984: US04425541 (17 worldwide citation)

An apparatus for determining the operating condition of capacitors of the type used for power factor correction on electric distribution systems is assembled in two sections. A first power supply device supplies an alternating electric current to a de-energized capacitor without removing it from its ...


5
Merlin E Burkum, Timothy M O Regan: Apparatus for identifying defective substation capacitors. Commonwealth Edison Company, Emrich & Dithmar, August 20, 1985: US04536704 (8 worldwide citation)

An apparatus for identifying defective substation capacitors includes a variable power supply section for supplying an alternating electric current to a de-energized substation capacitor bank without disconnecting the individually fused capacitor from the capacitor bus and a second power measurement ...


6
Merlin E Burkum, Timothy M O Regan: Apparatus for identifying defective electric power distribution capacitors. Commonwealth Edison Company, Emrich & Dithmar, September 10, 1985: US04540935 (6 worldwide citation)

An apparatus for determining the operating condition of capacitors of the type used for power factor correction on electric distribution systems is assembled in two sections. A first power supply device supplies an alternating electric current to a de-energized capacitor without removing it from its ...