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Negative sequence current phase failure protection circuit 2
Source: InternetPublisher:公子李 Keywords: Protection circuit phase failure protection BSP Updated: 2020/02/09
In the figure, capacitor
Cl, resistors Ri and R2 form a negative sequence current filter
; transistors VT1 and VTz form a Schmitt circuit
to improve the reliability of the circuit.
When one phase of the power supply is missing, the negative sequence current filter
has a current signal output, the transistor VTi is turned on,
VT2 is cut off, and VTa is turned on, the relay KA is closed, the contactor KM is released, and the motor stops.
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