Bw-ml series microcomputer small current grounding line selection device on the line selection scheme of the comprehensive use of the transient process of wavelet analysis and the use of the steady process of harmonic analysis, energy method, residual increment method, further improve the accuracy of line selection. Can automatically select small current grounding system single-phase grounding fault line, and automatically distinguish the line and bus grounding.

The core adopts high performance DSP digital processor and peripheral control circuit to improve the integration degree of the system. PT and CT sampling circuits are separated to eliminate the involvement between each other when adjusting magnification. In order to improve the sampling accuracy (especially with arc-suppression coil system), the device adopts high-precision AD sampling chip to ensure that it can still sample correctly under various interference conditions; The high performance multi-channel switch is selected to greatly increase the anti-interference ability and improve the accuracy of line selection; Direct grounding, gap grounding, arc grounding can be accurate line selection.

Easy and comprehensive automation and remote device interface, not only provides the serial port output signal RS232 or RS485 interface and provides the relay node output signal; It has two output modes of alarm coding, which can adapt to various needs of the site. The action delay time can be set by software. And have perfect self-detection ability, self-debugging ability.

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