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System Components
Fast switch
The fast switch adopts the electromagnetic repulsion operating mechanism and isolation transformer for power supply, it can perform the switching operation when the system line is not powered, the rated opening time is less than 5ms, the closing time is less than 20ms, and the mechanical life is more
than 2000 times. High voltage level expansion is achieved by series connection of multi-break, and the number of the series-connected break can be flexibly configured according to the actual system requirement.
Current limiting reactor
Current limiting reactor adopts air core type, the overall insulation heat-resistance grade is required to be F class, the winding inter-turn insulation heat-resistant material is required to be H class, and the pillar insulator adopts a solid core rod-shaped, non-magnetic porcelain pillar insulator. The impedance value can be flexibly configured according to different current limits, meeting the requirements of dynamic and short-time thermal withstand currents.
Measurement equipment
NR provides users with two solutions: electronic current transformer and conventional electromagnetic current transformer. The measurement system has high linearity, no residual magnetism and magnetic hysteresis, and the sampling rate is larger than 10kHz.
Control system
The typical configuration of the control system of fault current limiter is as shown in the figure below. It can realize the quick put-into-service and automatic exit of the fault current limiter, the current setting and the time delay setting are settable. Under certain conditions, the enabling or disabling of the fault current limiter can be blocked. It should be equipped with the manual enabling and disabling function of the fault current limiter, the self-supervision function of the status, and the fault recording function, and timely transmits the status and alarm information to the HMI system.
