Gec Alsthom T&d Sa

Gec Alsthom Sa

Gerard Ebersohl

Edmond Thuries

Olfa Chetay

A low voltage link for converting on/off orders between a relay building and remote high or medium voltage electrical disconnection apparatus, the link being mainly constituted by a bundle of electrical lines extending from the building to the remote apparatus, each line serving to convey an on/off order in the form of a voltage step. The voltage step transmitted on each line is converted, at the end of the line close to the electrical apparatus, into a two-state optical signal by an electro-optical conversion unit associated with said line, said optical signal then being delivered to an opto-electronic conversion unit associated with the electro-optical conversion unit in order to deliver a two-state electrical control signal to the apparatus. A crosstalk reduction device is provided at the terminals of each electro-optical conversion unit to reduce the level of a crosstalk voltage peak received at the terminals of said unit by use of a capacitive circuit forming a voltage divider, and to subtract a certain voltage from the reduced voltage peak by use of a zener diode so that the voltage peak received at the terminals of the electro-optical conversion unit is not detected thereby.

Low voltage link for transmitting on/off orders

A circuit for automatically monitoring equipment, including a plurality of transducers for measuring operating parameters and providing data to a multiprocessor system comprising stations interconnected by a local network and constituting a distributed database, the system being capable of interchanging data with a higher level including a computer with a bridge connected to said network, wherein said bridge is a 'terminal' microcontroller interchanging data with the stations via first messages corresponding to requests issued by the terminal and received by all of the stations in determined memory zones referred to as 'first dedicated zones', and second messages corresponding to response from the interrogated stations and received by said terminal in determined memory zones, referred to as 'second dedicated zones'.

Self-monitoring circuit, especially for electrical equipment, and in

A local network including no more than eight stations, each station being able to be both a source and a sink for data, and, thus being able both to receive and emit a message, the stations being interconnected by a serial bus and providing data to a distributed data base, which data is renewed cyclically under the control of a request generator that emits requests in the form of binary messages. The stations have addresses in the form of bytes respectively constituted by bytes of binary numbers representing powers of 2 in the range 0 to 7, a binary message emitted by the request generator containing the addresses, of all the stations designated to be sinks for the emitted binary message, in the form of a composite byte constituted by an OR UNION of the addresses of the stations designated to be sinks, a station thus observing that it is chosen as a sink by performing an AND INTERSECTION between the composite byte and the station's own address byte.

Local network, in particular for a control and self-monitoring system of

Control and self-monitoring system for an electrical apparatus comprising three poles, each including a closing coil and an opening coil, an opened auxiliary contact, and a closed auxiliary contact, wherein each of the poles is provided with a microprocessor receiving, in particular, information from the opened auxiliary contacts and controlling two static relays in series respectively with the circuit of the opening coil and in the circuit of the closing coil, the microprocessors being subscribers to a local bus comprising a serial bus under the control of a management member and connected to a processor station receiving the signals collected by the microprocessors and the signals issued by the protection devices or by the operator.

Control and self-monitoring system, in particular for a multipole

A device for determining the state of an apparatus capable of existing in a first state and a second state. The apparatus is provided with auxiliary contacts (CAO1, . . . , CAF1, . . . ) which provide binary state signals that depend on the current state of the apparatus. The device includes at least one first state auxiliary contact CAO1), that provides a '1' state signal when the apparatus is in its first state, and at least one second state auxiliary contact CAS1) providing a '1' state signal when the apparatus is in its second state. The device also has a programmed microcontroller (MP) having inputs on which it receives the state signals from the auxiliary contacts (CAO1, . . . , CAF1, . . . ) and also instructions (OO, OF) requesting the apparatus to switch from one state to the other. In particular, the programmed microcontroller provides output signals representative of the state (PO, PF) and/or of the availability (MFP) of the apparatus, and of the state and/or the availability (MACAO, MACAF, MFCA) of the auxiliary contacts. The output signals are generated by a program that implements a strategy for continuity of service and safety of utilization for the apparatus.

Device for determining the state of an apparatus, and in particular the

A device for signalling remotely the state of a device able to assume a plurality of discrete states comprises a circuit for producing inside a screened enclosure a direct current voltage free of interference. The screened enclosure contains a first circuit for producing from the direct current voltage electrical pulses whose duration is proportional to the value of an inductance which can assume distinct values according to the various states of the device. A second circuit converts the electrical pulses into optical pulses and an optical fiber transmits the pulses out of the enclosure to a processor.

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La Mulatiere, France

Gerard Ebersohl