Electrical transmission or interconnection systems – Plural load circuit systems – Selectively connected or controlled load circuits
Patent
1998-12-29
2000-10-03
Ballato, Josie
Electrical transmission or interconnection systems
Plural load circuit systems
Selectively connected or controlled load circuits
307 40, 361605, H02J 300
Patent
active
061277428
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electrical switchgear apparatus comprising: designed to be connected to the electrical power distribution system via the fixed part, connect the apparatus of the removable part to the fixed part and to the electrical power distribution system, and removable part.
Known electrical switchgear apparatuses comprise a fixed part connected in permanent manner to an electrical power system and a removable part able to be easily connected to and disconnected from the fixed part. In the case of a circuit breaker, the fixed part is a frame or support comprising fixed connectors connected to the electrical power system. The removable part is a circuit breaker comprising connecting studs designed to be connected to the fixed connectors.
In known manner, the removable parts such as circuit breakers, contactors or switches comprise auxiliary control or indicating circuits. These auxiliary circuits are connected to monitoring or control circuits via plug-in contacts arranged between the fixed part and the removable part.
The circuit breakers comprise electronic processing units equipped with setting devices. Said settings notably concern tripping curves which require the current threshold and time delay value parameters to be set. When these settings are complex, the processing units store the setting parameters in memory.
It is also known to fit communication devices in electrical switchgear apparatuses. These devices are generally used to transmit or receive information concerning the status of the apparatus, the currents flowing in the power system, or control orders.
The communication devices are disposed on the removable part and connected notably to an electronic trip device. When the switchgear apparatus is a circuit breaker, the communication device is connected to a communication network via plug-in contacts arranged between the fixed part and the removable part. Preferably, the communication network comprises a two-wire bus.
When several communication devices are connected to the communication bus, each device comprises an addressing means so as to identify the messages it transmits or receives. The addressing means are for example thumb-wheels, blocks of several contacts or electronic memories.
The removable parts of the electrical switchgear apparatus are designed to be easily disconnected and replaced by personnel specialized in maintenance of electrical installations. This personnel must be able to replace the electrical switchgear apparatuses, such as circuit breakers, in a simple and reliable manner without having to perform any work on complex settings of the electronic circuit breakers or the communication devices.
However, switchgear apparatuses comprising complex trip devices or communication devices require work to be carried out each time a replacement is made. This work mainly involves re-establishing all the processing unit settings and notably configuration of the communication address.
SUMMARY OF THE INVENTION
Accordingly, it is a primary object of the present invention to provide an electrical switchgear which includes a fixed part such as a frame and a removable part such as a circuit breaker designed to be connected, through the fixed part, to a power distribution system and to a communication network. The removable part comprises a first communication circuit receiving a first address from a first addressing device. The fixed part comprises a second addressing device and a second communication circuit designed to supply a second address to the first communication circuit. To communicate, the first communication circuit chooses in priority the address supplied by the second addressing device and the second communication circuit. If this address is not valid, it then chooses the address supplied by the first addressing device.
BRIEF DESCRIPTION OF THE DRAWINGS
Other advantages and features will become more clearly apparent from the following description of different embodiments of the invention given as non-restrictive examples onl
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Ballato Josie
Rios Roberto
Schneider Electric SA
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