A universal device for registration and analysis of emergency processes, combining the functions of selective detection of line faults in networks of any topology and neutral type and measurement of basic parameters of electricity. The device is mounted in the switchgear cubicle on the panel of the control panel.
It is equipped with relay outputs and RS-485 communication channel according to standard protocols Modbus, GOST R IEC 60870-5-101. The following functions are realised in the device: control of voltage presence on the cable line (from capacitive or resistive dividers),control of correctness of alternation of phases of the network 6-20kV; measurement of currents Ia, Ib, Ic and calculation of current 3I0; automatic fixation of current values on each phase at exceeding the set point (MTZ) with determination of power direction;automatic recording of the calculated value of current 3I0 for the purpose of detecting single-phase earth fault when the setpoint is exceeded with the determination of the direction of power on the current 3I0; determination of deviation from the steady state load.
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