Method and circuit arrangement for measuring earth leakages...

Details Method and circuit arrangement for measuring earth leakages... Method and circuit arrangement for measuring earth leakages...

2005-03-08

2005-03-08

Tang, Minh N. (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

C324S1540PB

Reexamination Certificate

active

06864673

ABSTRACT:
A method and a circuit arrangement (10) for the measurement of earth leakage in intrinsically safe current feeds to electronic control units (4) for underground mining installations and machines, whereby at least one earthed control unit is connected to the two intrinsically safe potentials of an intrinsically safe direct current supply (1) and at least one earth leakage sensor (20) is provided for earth leakage measurement with which steps of the periodical application of a test potential (Umess) from an intrinsically safe switchable test voltage source (21) to an RC-element (22), isolated from earth (8) by means of decoupling capacitors (C1, C2), measurement of the charging or discharging current behaviour of the RC-element (22) after each switching of the test voltage source (21) and comparison of the measured charging or discharging behaviour with stored reference data.

REFERENCES:
patent: 4293813 (1981-10-01), Groenenboom
patent: 5818236 (1998-10-01), Sone et al.
patent: 39 01 277 (1990-07-01), None
patent: WO 0155738 (2001-08-01), None

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