Short-circuiting device of an electrical installation and system for extinguishing an electrical arc that may appear in such an installation

Patent metadata

Field	Value
Publication number	US-10483749-B2
Application number	US-201415035376-A
Country	US
Kind code	B2
Filing date	Dec 9, 2014
Priority date	Dec 10, 2013
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A device for short-circuiting an electrical installation that includes at least two electrical conductors, the device including at least two connection terminals, each configured to be connected to a respective electrical conductor, an electromechanical unit configured to establish a short-circuit between the connection terminals, and at least one resistive element configured to connect one of the connection terminals to the corresponding electrical conductor. Each resistive element includes a first connection end connected to the corresponding connection terminal and a second connection end configured to be connected to the corresponding electrical conductor. The resistive element has an impedance, and variation in a value of the impedance is less than 1 mΩ for a temperature of the resistive element of 0° C. to 200° C.

First claim

The invention claimed is:

1. A device for shorting an electrical installation including at least two electrical conductors, the device comprising:
at least two connection terminals, each configured to be connected to a respective electrical conductor;
a parallelepipedic electromechanical block configured to set up a short circuit between the connection terminals;
at least two resistors, one for each of the two connection terminals, each of the at least two resistors being configured to connect a corresponding one of the connection terminals to the corresponding electrical conductor, each of the resistors comprising a first connection end connected to the corresponding connection terminal and a second connection end configured to be connected to the corresponding electrical conductor,
wherein each of the resistors has an impedance, and a variation in a value of the impedance is less than 1 mΩ for a temperature of the resistors of between 0° C. and 200° C.

2. The device as claimed in claim 1 , wherein the impedance value of each of the resistors is between 0.3 mΩ and 1 mΩ for a temperature of the resistors of between 0° C. and 100° C.

3. The device as claimed in claim 1 , wherein the electromechanical block comprises a moving member configured to switch between a rest position in which the connection terminals are electrically isolated from one another and a short-circuit position in which the connection terminals are mutually connected.

4. The device as claimed in claim 1 , wherein the resistors are electrically isolated from one another.

5. The device as claimed in claim 1 , wherein each of the resistors is made of stainless steel.

6. The device as claimed in claim 1 , wherein each of the resistors comprises an edge connecting the first connection end and the second connection end, and each of the resistors has a cross section, perpendicular to the corresponding edge, that is greater than or equal to 400 mm 2 .

7. The device as claimed in claim 1 , wherein at least one connection terminal is raised by a height with respect to the other connection terminals, the raised height being between 2 cm and 4 cm.

8. The device as claimed in claim 1 , wherein each of the resistors is in boustrophedon form.

9. A system for quenching an electric arc that can occur in an electrical installation, the installation including at least two electrical conductors, the system comprising:
at least one device for detecting the electric arc on each conductor;
at least one electrically isolating circuit breaker connected to the electrical conductors between the electrical installation and a power supply source of the electrical installation;
a shorting device connected to the electrical conductors;
an electronic device configured to control the shorting device so that the shorting device is in a state for setting up a short circuit between the electrical conductors when the electric arc is detected by the detection device, and configured to trip the at least one electrically isolating circuit breaker when the electric arc is detected by the detection device,
wherein the shorting device includes
at least two connection terminals, each configured to be connected to a respective electrical conductor;
a parallelepipedic electromechanical block configured to set up a short circuit between the connection terminals;
at least two resistors, one for each of the two connection terminals, each of the at least two resistors being configured to connect a corresponding one of the connection terminals to the corresponding electrical conductor, each of the resistors comprising a first connection end connected to the corresponding connection terminal and a second connection end configured to be connected to the corresponding electrical conductor,
wherein each of the resistors has an impedance, and a variation in a value of the impedance is less than 1 mΩ for a temperature of the resistors of between 0° C. and 200° C.

10. The system as claimed in claim 9 , wherein the shorting device is positioned downstream of the at least one electrically isolating circuit breaker with respect to the electrical power supply source.

Assignees

• Schneider Electric Ind Sas

Inventors

• Rival Marc
• Giraud Denis
• Rota Daniel

Classifications

• H02H3/023

  by short-circuiting · CPC title

• H02H3/08 Primary

  responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04) · CPC title

• H02H1/0023

  sensing non electrical parameters, e.g. by optical, pneumatic, thermal or sonic sensors · CPC title

• H01C7/06 Primary

  including means to minimise changes in resistance with changes in temperature · CPC title

• H01C1/014

  the resistor being suspended between and being supported by two supporting sections (H01C1/016 takes precedence) · CPC title