Reference voltage measuring bridge for a device for...

Details Reference voltage measuring bridge for a device for... Reference voltage measuring bridge for a device for...

G - Physics

01

R

G01R 31/02 (2006.01) G01R 15/06 (2006.01) G01R 19/00 (2006.01) G01R 27/14 (2006.01) G01R 27/18 (2006.01)

Patent

CA 2058380

ABSTRACT REFERENCE VOLTAGE MEASURING BRIDGE FOR A DEVICE FOR MONITORING AND MEASURING THE INSULATION OF A DC VOLTAGE ELECTRICAL MAINS SYSTEM An insulation monitor (5) comprises a measuring bridge (8) of the reference AC voltage (Vd) of low frequency (4 to 10 Hertz) input to a DC mains system (1). The bridge is a mixed bridge (8), comprising a resistive bridge (9) with a high total resistance (R'1 + R'2 = 100 Megaohms) and a very low dividing ratio (R'2/R'1 = 1/1000), and a capacitive bridge (10) with a low impedance with respect to that of the lower resistance (R'2) of the resistive bridge (9). Refer to figure 2.

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