A dynamic braking load analyzer that determines the proper resistance value for a dynamic braking load resistor to be used in combination with a variable frequency drive or servo-drive to accommodate the power dissipated from an induction motor when it is being reduced in speed. The analyzer includes a resistor bank having a plurality of resistors electrically coupled in parallel. Switches are provided between the resistors, and a resistor selector switch determines which resistors are switched into the resistor bank circuit. A heat sensing resistor in the resistor bank measures the heat generated by the resistors and provides a signal that is read by a heat meter. The combination of the temperature measurement and the resistance of the resistors in the circuit gives the proper braking resistance value for the deceleration of the induction motor.
Method And Apparatus For Control And Detection In Resistance Grounded Electrical Systems
William Brungs - North Bend OH, US Thomas Yingling - Batavia OH, US Douglas Frushour - Burlington KY, US
International Classification:
H02H003/00
US Classification:
361/042000
Abstract:
A ground fault detector for use in resistance grounded electrical systems. In one embodiment, the system includes a digital processor to monitor an electrical parameter of the resistance to determine and indicate whether a ground fault has occurred. Data regarding the ground fault occurrence can then be digitally stored transmitted, or processed, such as by an external computer. In another embodiment, the ground fault detector includes a filter to remove the harmonic components of the monitored electrical parameter, to avoid false alarms. In addition, in another embodiment, the ground fault detector can also determine whether a high harmonic condition is present in the monitored electrical system. The phase of the electrical system can be grounded by pressing a test switch, thereby causing a ground fault and allowing the harmonic components of the signal in the electrical system to be monitored.
Name / Title
Company / Classification
Phones & Addresses
Thomas Yingling Principal
Try Services Services-Misc
2354 Bauer Rd, Stonelick, OH 45103
Thomas Yingling
SYI ENTERPRISES, INC
Hamilton, OH
Isbn (Books And Publications)
Hart Crane and the Homosexual Text : New Thresholds, New Anatomies
Tom Yingling (1968-1972), Regina Gruppi (1968-1972), Brian Austin (1974-1978), Gail Williams (1974-1978), Vincent Mauch (1979-1983), Vince Mauch (1983-2005)