DC electrical network and overcurrent protection system for a DC electrical network
The DC electrical network comprises an electrical load supplied with electricity by an electrical power source to which the electrical load is linked by a first electrical line and a second electrical line. An overcurrent protection system comprising an input pole and an output pole is mounted in series on the first electrical line. The overcurrent protection system comprises an electronic switch mounted in series between the input pole and the output pole, an electrical current sensor, and a controller configured to control the electronic switch. It also comprises an electronic device linked to the input pole and to the second electrical line. The controller is configured to command a conducting state of the electronic device when a current measurement from the electrical current sensor is above a predetermined current threshold, then to command an opening of the electronic switch.
1. A DC electrical network provided to supply electricity to an electrical load by an electrical power source, the electrical network comprising:
said electrical power source, comprising a first pole and a second pole; and
said electrical load, comprising a first pole and a second pole;
a first electrical line linking the first pole of the electrical load to the first pole of the electrical power source;
a second electrical line linking the second pole of the electrical load to the second pole of the electrical power source;
an overcurrent protection system mounted in series on the first electrical line, the overcurrent protection system comprising
an input pole linked to the first pole of the electrical power source by an upstream part of the first electrical line, and
an output pole linked to the first pole of the electrical load by a downstream part of the first electrical line,
wherein the overcurrent protection system comprises
an electronic switch mounted in series between the input pole and the output pole,
an electrical current sensor provided to measure an electrical current circulating between the input pole and the output pole, and
a controller configured to control the electronic switch,
wherein the overcurrent protection system comprises an electronic device comprising a first pole linked to the input pole of the overcurrent protection system and a second pole linked to the second electrical line, this electronic device being designed to present a non-conducting state in normal operation and a conducting state when a command is applied to it, wherein the electronic device comprises a discharge tube, and
wherein the controller is configured to:
acquire an electrical current measurement from the electrical current sensor;
compare the current measurement to a predetermined current threshold; and
when the current measurement is above the predetermined current threshold, apply a command to the electronic device to command its conducting state, then command an opening of the electronic switch.
2. The DC electrical network according to claim 1 , wherein the controller is configured to apply said command to the electronic device by commanding an application, between two poles of the discharge tube, of a voltage greater than a discharge tube trigger voltage.
3. The DC electrical network according to claim 1 , wherein one of the poles of the discharge tube is linked to the input pole of the protection system via a diode.
4. The DC electrical network according to claim 1 , wherein the controller is configured to issue a command to open of the electronic switch after a predetermined time after having applied the command to the electronic device.
5. The DC electrical network according to claim 1 , wherein the controller is configured to issue a command to open electronic switch after having applied the command to the electronic device, when an electrical current measurement measured by the electrical current sensor is below a second predetermined current threshold.
6. The DC electrical network according to claim 1 , wherein the controller is configured to stop the application of the command to the electronic device after having commanded the opening of the electronic switch.
7. The DC electrical network according to claim 1 , wherein the controller is configured to receive a reset command and to command a closing of the electronic switch in response to a reception of a reset command.
8. An aircraft, comprising the DC electrical network according to claim 1 .
9. An overcurrent protection system for a DC electrical network provided to supply electricity to an electrical load by an electrical power source, the electrical power source comprising a first pole and a second pole and the electrical load comprising a first pole and a second pole,
the DC electrical network being configured such that the first pole of the electrical load is linked to the first pole of the electrical power source by a first electrical line and the second pole of the electrical load is linked to the second pole of the electrical power source by a second electrical line,
the overcurrent protection system being configured to be mounted in series on the first electrical line and comprising an input pole configured to be linked to the first pole of the electrical power source by an upstream part of the first electrical line and an output pole configured to be linked to the first pole of the electrical load by a downstream part of the first electrical line,
the overcurrent protection system comprising
an electronic switch mounted in series between the input pole and the output pole,
an electrical current sensor configured to measure an electrical current circulating between the input pole and the output pole, and
a controller configured to control the electronic switch,
the overcurrent protection system comprising an electronic device comprising a first pole linked to the input pole of the overcurrent protection system and a second pole provided to be linked to the second electrical line, the electronic device being configured to present a non-conducting state in normal operation and a conducting state when a command is applied to it, wherein the electronic device comprises a discharge tube, and
wherein the controller is configured to:
acquire an electrical current measurement from the electrical current sensor;
compare the current measurement to a predetermined current threshold; and
when the current measurement is above the predetermined current threshold, apply a command to the electronic device so as to command its conducting state, then command an opening of the electronic switch.