| Brand | RW Energy |
| Model NO. | Is-Lock fault current identification module |
| Rated frequency | 50/60Hz |
| Series | DDX |
DDX1 short-circuit current limiter (DDX1 current limiter) based on micro-explosion technology is to use micro-explosion technology to quickly cut the leading electrical circuit (the micro-explosion device is controlled by a special electronic controller), so that the fault current is quickly transferred to the branch of the special high-voltage current limiting fuse, and the fuse completes the current limiting and interruption of the fault current, limiting the peak of the first half of the fault current to a lower level, which not only solves the dynamic stability problem of the power system, but also solves the thermal stability problem of the power system.
The Is-Lock Fault Current Identification Module (Is-Lock) is an auxiliary judgment device with action direction selection specially developed for the DDX1 current limiter. In order to reduce the unnecessary operation of the DDX1 current limiter and eliminate the resulting system disturbance and operation and maintenance costs, Is-Lock can provide accurate and reliable selective action signals (auxiliary criterions) for the DDX1 current limiter under the operation conditions of action selectivity, such as the connection position of multi-section bus running in parallel, the new power supply is connected to the Internet or the interconnection of two power supplies, and the star interconnection of three power supplies, so that the control strategy of the micro-explosive DDX1 current limiter installed in the special power distribution system has both overcurrent tripping and action direction selection. The short-circuit protection effect of DDX1 current limiter on the power distribution system is optimized and the operation and maintenance cost is significantly reduced.
Is-Lock can introduce up to three branch currents 1I, 2I and 3I of closely related nodes, each branch includes A, B and C three phases, convert and modulate the collected current signal inside the module to obtain a voltage signal with an appropriate range, and input it to a high-performance CPU for rapid analysis and operation after 16-bit high-precision A/D analog-to-digital conversion. Only when the current direction criterion, current eigenvalue threshold criterion and handshake signal criterion meet the conditions at the same time, the Is-Lock will send an enabling signal to the corresponding port, and this signal is logically calculated with the electronic controller on the high voltage side of the DDX1 current limiter to determine whether to output a trip command.
