How does the zero sequence current transformer work?

Since the primary winding of the zero-sequence current transformer is the neutral of the three-phase star connection. Under normal conditions, the sum of the three-phase currents is equal to zero, the neutral line (primary winding) has no current, no magnetic flux is generated in the iron core of the transformer, and no induced current is present in the secondary winding. When a single-phase earth fault occurs on the protected equipment or system, the sum of the three-phase currents is no longer equal to zero, and the primary winding will flow a current equal to three times the zero-sequence current of each phase. At this time, the magnetic flux is generated in the iron core. The secondary winding will induce current.

Digital Resistive Touch Membrane Switch

Digital Resistive (Transparent Membrane Switch) digital switch

This touch switch is sometimes referred to as the X-Y matrix touch switch. Digital resistive touch switch are as easy to interface with a controller as a conventional matrix keyboard and popular when finger-sized touch zones are required.

To produce digital resistive touch switch, the ITO coating is etched away (or selectively applied) to form rows on one layer and columns on the opposite layer (Figure 1). When assembled, the rows and columns form a matrix of switches. The location of each switch is permanent, and the size cannot change. The resolution of the touch switch depends solely on the number of rows and columns.

Digital Resistive Touch Membrane Switch,Oval Type Membrane Switch,Two Circuit Layer Membrane Switch,Blue Background Membrane Switch

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