Conductor temperature detector
Various implementations described herein are directed to a method for detecting, by a device, an increase in temperature at certain parts of an electrical system, and taking appropriate responsive action. The method may include measuring temperatures at certain locations within the system and estimating temperatures at other locations based on the measurements. Some embodiments disclosed herein include an integrated cable combining electrical conduction and heat-detection capabilities, or an integrated cable or connector combining electrical conduction with a thermal fuse.
1. An apparatus comprising:
a first conductor and a second conductor, the first conductor and the second conductor being in electrical contact;
a spring disposed between the first conductor and a first surface, wherein the spring is loaded to apply a force to the first conductor; and
a pellet disposed between the first conductor and a second surface, the pellet sized and positioned to prevent unloading of the spring and designed to deform at a predetermined temperature,
wherein, upon the pellet deforming at the predetermined temperature, the spring is configured to unload in a direction toward the first conductor so as to break the electrical contact between the first conductor and the second conductor, and
wherein one conductor of the first conductor and the second conductor is connected to an electrical input for receiving photovoltaic power, and the other conductor of the first conductor and the second conductor is connected to an electrical output for providing photovoltaic power.
2. The apparatus of claim 1 , wherein the pellet is designed to deform at a temperature of about 200 degrees Celsius.
3. The apparatus of claim 1 , further comprising a photovoltaic generator, wherein the first conductor, second conductor, spring and pellet are disposed in a connector terminal of the photovoltaic generator.
4. The apparatus of claim 1 , further comprising a photovoltaic power device, wherein the first conductor, second conductor, spring and pellet are disposed in an output connector of the photovoltaic power device.
5. The apparatus of claim 4 , wherein the connector of the photovoltaic power device is a male output connector terminal for connecting to a female output connector of a second photovoltaic power device.
6. The apparatus of claim 4 , wherein the connector of the photovoltaic power device is a female output connector terminal for connecting to a male output connector of a second photovoltaic power device.
7. The apparatus of claim 4 , wherein the photovoltaic power device comprises at least one of a direct current to direct current converter and a direct current to alternating current converter.
8. The apparatus of claim 4 , wherein the photovoltaic power device is integrated in a photovoltaic generator junction box.
9. An apparatus comprising:
a first photovoltaic module comprising a first electronic circuit and a first circuit terminal;
a connector coupled to the first circuit terminal and configured to connect to a terminal or a connector of a second electronic circuit; and
a thermal fuse disposed in or next to the connector, the thermal fuse designed to disconnect the first electronic circuit from the second electronic circuit in response to an increase in temperature in or next to the connector.
10. The apparatus of claim 9 , wherein the photovoltaic module comprises a photovoltaic generator.
11. The apparatus of claim 9 , wherein the photovoltaic module comprises a battery.
12. The apparatus of claim 9 , wherein the photovoltaic module comprises a combiner box.
13. The apparatus of claim 9 , wherein the photovoltaic module comprises at least one of: a direct current to direct current converter and a direct current to alternating current converter.
14. The apparatus of claim 9 , wherein the thermal fuse is designed to disconnect the first electronic circuit from the second electronic circuit in response to a temperature of about 200 degrees Celsius.
15. A photovoltaic string comprising:
a plurality of photovoltaic generators, each photovoltaic generator having a plurality of output connectors;
wherein each photovoltaic generator has a first output connector electrically connected to a second output connector of a different photovoltaic generator, forming a connection point; and
wherein at least one of the first and second output connectors comprise an integrated thermal fuse designed to disconnect the first output connector from the second output connector at a predetermined temperature.
16. The photovoltaic string of claim 15 , wherein the integrated thermal fuse is designed to disconnect the first output connector from the second output connector at a temperature of about 200 degrees Celsius.
17. The photovoltaic string of claim 15 , wherein each of the photovoltaic generators comprises a junction box, each junction box comprising at least one of a direct current to direct current converter and a direct current to alternating current converter.
18. The photovoltaic string of claim 17 , wherein each of the photovoltaic generator junction boxes further comprises a temperature sensing device responsive to an increase in temperature in or next to one or more of the output connectors and a controller configured to receive measurements from the temperature sensing device and trigger an overheating response in response to a measurement indicating overheating.
19. The photovoltaic string of claim 18 , wherein the overheating response comprises raising an alarm.
20. The photovoltaic string of claim 18 , wherein the overheating response comprises reducing current flowing through the output connectors.