Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1998-11-13
2000-01-04
Jackson, Stephen W
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 23, 361115, H02H 300
Patent
active
060116803
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention related to a connector, in particular a plug-in connector for TT and TN networks, in which an electronic monitoring and control unit supplied with a voltage switches through conductors and releases the connection by means of a switching device, from the supply side to the load side of the connector as a function of information or measured data.
BACKGROUND INFORMATION
In deep coal mining, concepts have been developed to provide power system which perform functions such as conductor supply and/or load side potential measuring and fault current monitory and actuation of a switch device when certain conditions occur. See Record of the Industry Applications Conference (IAS), Orlando, Oct. 8-122, 1995, Vol. 3, Oct. 3, 1995, IEEE, pp. 2009-2012, XP000547126, Novak, T., et al., "Technological Innovations in Deep Coal Mine Power Systems," esp. FIG. 1).
V-E 0100 defines a TT network as a type of network in which overcurrent-, fault-current- and fault-voltage-operated protective devices can be used. TN networks are the most common, with overcurrent- and fault-current-operated protective devices being used. All elements are connected by means of a separate conductor, the PE conductor, which performs the protective function. Even though national and international regulations exist for setting up and testing electrical power systems, it is occasionally not possible in practice to prevent power systems from demonstrating deficiencies that can result in accidents or fire. In most cases, effective protection could be provided by using fault-current-operated protective devices, especially with low rated fault currents of 30 mA or 10 mA. However, these types of protective devices are not yet prescribed nationally or internationally for all fields of application.
According to current concepts in structural systems engineering, opening and closing commands can be supplied to specially designed receptacles via a bus. These types of switching commands may result in dependence on measurement results and information processing systems See e.g., (German Patent No. U-9 312 528). In this regard, certain functions, such as current-limiting functions, can even be transferred to the receptacle, which are then referred to as intelligent receptacles. German Patent No. 4 425 876 describes an intelligent receptacle of this type which includes a connector which has a bus interface. Here, the power line is used as the bus.
Other concepts provide the receptacles with child-proof mechanisms, or mechanical latches, which provide access to the current-conducting leads only when a suitable plug is inserted.
SUMMARY
An object of the present invention is to pursue the idea of the intelligent receptacle and to generally develop a connector, which can be a receptacle, taking into account the most frequent and hazardous deficiencies of these devices and protecting downstream equipment and personnel.
According to the present invention, an arrangement is provided in which potential-measuring devices measure conductor potentials continuously or at regular intervals on the supply and/or load side. The switching device is actuated if the result falls short of or exceeds specific limits, thereby releasing the connection, if it was previously established. When a load is connected for the first time, the conductor is or is not switched through as a function of the measured values. The potential should be measured on the supply and load sides of the contact gap, especially in the case of protective conductors. This helps detect defective or interrupted protective conductors. It is possible to establish both minimum and maximum limits in order to check for proper connection, intact conductors and whether the protective conductor is set to ground potential. The conductors to be switched through are also monitored by a fault current detecting device. The fault current also serves as a criterion for reversed conductors, especifially for the hazardous reversal of the external conductor, L-conductor or protective co
REFERENCES:
patent: 5519561 (1996-05-01), Mrenna et al.
patent: 5555483 (1996-09-01), Pressman et al.
T. Novak et al., "Technological Innovations in Deep Coal Mine Power Systems", 1995 IEEE, pp. 2008-2016.
Schmid Reinhard
Solleder Reinhard
Jackson Stephen W
Siemens AG
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