摘要:
The aim of the invention is to protect an electromagnetic switching device when a load (6) is switched to a supply voltage (U). A current (IL) that flows through the load contact (2) is monitored. The electric circuit is interrupted when the current (IL) exceeds a threshold value that is below the current carrying capacity of the load contact (2). The electric circuit is automatically closed again after the current (IL) which flows through the load contact (2) has decreased.
摘要:
In accordance with one embodiment, the present technique provides a circuit interrupter. The exemplary circuit interrupter includes conductive spanner that completes an electrical pathway between first and second electrical conductors. To facilitate a good electrical connection between the conductive spanner and the first and second conductors, the exemplary interrupter includes a biasing mechanism that biases the conductive spanner toward the first and second conductors. However, in the event of a fault condition, for instance, the conductive spanner is displaced away from the first and second conductors by magnetic forces, and the electrical path is interrupted. To facilitate this displacement, the biasing mechanism presents an opposing force to displacement relationship with a negative slope. That is to say, the biasing force provided by the biasing mechanism decreases as the distance between the conductive spanner and the first and second electrical conductors increases. Additionally, pistons driven by arc heated gases engage the biasing mechanism to assist the magnetic forces during the interruption of soft faults.
摘要:
A method an apparatus is disclosed for preventing contact welding during fault conditions. This fault current tolerable contactor includes two magnetic components, one in operable association with the movable contacts, and the other fixable attached above the movable contacts such that when a fault condition occurs, a high magnetic force is created to draw the two magnetic components together thereby opening the contacts. The magnetic force keeps the contacts open at least until current zero, and preferably a defined time thereafter to provide enough time for the contacts to cool and prevent welding upon the closure of the contacts.
摘要:
Disclosed herein are efficient mechanical fuse devices that are capable of functioning at high current levels. These devices comprise mechanical features configured such that the fuse devices have a non-triggered state, which allows current to flow through the device, and a triggered state, which does not allow current to flow through the device. In some embodiments, the devices are configured such that a certain pre-determined current level flowing through the device will generate a sufficient electromagnetic field to cause the mechanical elements to transition the fuse device into the triggered state and thus interrupt a connected electrical circuit, device or system. In some embodiments, these devices can also comprise hermetically sealed components.
摘要:
The aim of the invention is to protect an electromagnet switching device when a load is switched to a supply voltage. A current that flows through the load contact is monitored. The electric circuit is interrupted when the current exceeds a threshold value that is below the current carrying capacity of the load contact. The electric circuit is automatically closed again after the current which flows through the load contact has decreased.