Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electrical power distribution systems and devices
Reexamination Certificate
1997-11-17
2001-03-20
Tolin, Gerald (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electrical power distribution systems and devices
C200S332100, C218S120000, C218S154000, C361S618000
Reexamination Certificate
active
06205018
ABSTRACT:
TECHNICAL FIELD
The present invention relates to air insulated switchgear (AIS) provided with a device for operating one or more power circuit breakers in the switchgear.
DESCRIPTION OF THE BACKGROUND ART
Switchgear for high voltages/current strengths will most often include one or more operating devices and one or more circuit breakers each connected to busbars. The operating devices for operating the circuit breakers are connected to the switchgear and must be dimensioned to manage the maximum load when the current supply is broken. To this end, each operating device is provided with a very powerful spring or with powerful mutually coacting springs, wherein the spring force/spring forces have been dimensioned to manage this seldomly occurring maximum load. It is necessary to adapt the mechanical structural components of the operating device to the largest active spring and circuit-breaking forces, so as to prevent damage to the operating device. The operating device in also subjected to high stresses even when making or breaking a current circuit in the absence of a maximum load, since large spring forces must be balanced in the operating device, these stresses being liable to result in damage to the mechanical components. A damaged operating device must either be replaced or repaired. In such cases, it is necessary to manoeuver a circuit breaker (fixedly) connected to the operating device to an off-position and take the circuit breaker out of operation, meaning that the current supply must either be switched off or rearranged. If the circuit breaker cannot be manoeuvered to an off position, it is necessary to open a parent circuit breaker, which entails still greater disturbance in operation.
SUMMARY OF THE INVENTION
With the intention of simplifying the replacement of an operating device in an air insulated switchgear having power circuit breakers, the operating device has been made separable to the circuit breaker and capable of being docked thereto. By a dockable operating device is meant an operating device which an be readily removed from and fitted onto the power circuit breaker, i.e. be removable and connectable without needing to influence the circuit breaking function. This is achieved without loosening links, which has been made possible by providing the operating device with guide parts, such as an outgoing, rotatable splined shaft, and by providing the switchgear with corresponding guide parts adapted for coaction with the first-mentioned guide parts, for instance a receiving splined hole in a circuit breaker operating shaft, said splined hole being adapted to receive the splined shaft. For reasons of personal safety, it is essential that this can be effected without access to the high voltage parts of the switchgear. This is made possible by placing the manoeuvering device in a space separated from said parts. In earlier designs, it was the power circuit breakers in switchgear that were most likely to suffer damage, therewith necessitating a replacement of the damaged circuit breakers. In the case of modern-day switchgear, it is more often the operating device that suffers damage rather than the circuit breakers. An operating device that can be readily docked onto the switchgear enables the operating device to be easily replaced without affecting the circuit breaker function.
REFERENCES:
patent: 3597556 (1971-08-01), Sharp
patent: 4214291 (1980-07-01), Koshman
patent: 4384179 (1983-05-01), Milianowicz
patent: 4550234 (1985-10-01), Steinemer
patent: 4593165 (1986-06-01), Steinemer
patent: 5354959 (1994-10-01), Yoshizumi et al.
patent: 5450280 (1995-09-01), Wactor
patent: 1233455 (1967-02-01), None
patent: 2049736 (1972-09-01), None
patent: 2337135 (1974-02-01), None
patent: 0279045 (1988-08-01), None
patent: 2044003 (1980-01-01), None
ABB AB
Hodgson & Russ LLP
Tolin Gerald
LandOfFree
Air insulated switchgear with operating device for effect... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Air insulated switchgear with operating device for effect..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air insulated switchgear with operating device for effect... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2491696