Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1998-06-04
2000-03-07
Sherry, Michael J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 931, H02H 300
Patent
active
060348593
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a circuit-breaker with current transformers and with an electronic tripping device having a housing. In particular, the present invention relates to a circuit-breaker for processing signals supplied by the current transformers, the circuit-breaker including a data storage device for storing characteristic values of the circuit-breaker.
BACKGROUND INFORMATION
U.S. Pat. No. 5,331,500 describes a circuit-breaker. A data storage device which is described therein is an interface card which is fixedly secured to the support of a circuit-breaker in such a way that an operative connection with the tripping device is not established until the tripping device is inserted into the circuit-breaker. Signals from the current transformer are sent to the tripping device through lines connecting the current transformer to the interface card. The tripping device thus receives information about the characteristics of the circuit-breaker.
Due to the fact that the data storage device is a fixed component of the circuit-breaker and the characteristic values are stored in the tripping device itself, this reliably achieves the result, in comparison with another conventional method, that invariable features of the circuit-breaker such as the type and rated current as well as the characteristics of the current transformers which are also permanently installed in the circuit-breaker are invariably taken into account even when the electronic tripping device is replaced. However, this means that when a fault occurs and the electronic tripping device is subsequently tested, such faults which have occurred in the data storage device are not detected. Furthermore, greater caution is required when the current transformers of the circuit-breakers are to be replaced and therefore the data storage device must also be adjusted or replaced.
SUMMARY OF THE INVENTION
An object of this present invention is to improve the functional test and fault finding in circuit-breakers with a data storage device of the aforementioned type.
According to the present invention, this object is achieved because the data storage device, which is designed with interfaces to the tripping device and the current transformers, is detachably mounted on the outside of the tripping device. This achieves the result that the tripping device can be removed from the circuit-breaker only together with the data storage device. Therefore, if a functional test is performed on a tripping device removed from the circuit-breaker, the data storage device is necessarily included in the functional test. If a malfunction is found, this ensures that the troubleshooting will extend equally to the tripping device itself as well as the data storage device. If it proves to be necessary to replace only the tripping device, the data storage device can be separated from the respective tripping device and attached to the new tripping device. The characteristic values are transferred with the data storage device.
The data storage device may be arranged on the rear wall facing away from the operating front of the tripping device. The interface to the tripping device and the interface to the current transformers may be arranged on opposite sides of a circuitboard of the data storage device. This permits an expedient mounting of the data storage device on the tripping device with a small overall depth.
To ensure a reliable electric connection between the tripping device and the data storage device, the data storage device may have a separate housing with a fastening element that serves to connect it to the tripping device.
BRIEF DESCRIPTION OF THE DRAWING
The FIGURE illustrates a side view and a sectional view of a circuit-breaker in accordance with an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The FIGURE shows schematically a side view and a sectional view of a low-voltage circuit breaker with an electronic tripping device that is accessible on the front side and a data storage device arra
REFERENCES:
patent: 4209817 (1980-06-01), McGinnis
patent: 5331500 (1994-07-01), Corcoles et al.
patent: 5331501 (1994-07-01), Shimp
Sherry Michael J.
Siemens Aktiengesellschaft
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