System and method for improving accuracy of high voltage phasing voltmeters
AssigneeHoneywell International Inc.
InventorsAdishesa Cs, Anil Nagpal
Life of this patent
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Abstract
A high voltage phasing voltmeter comprises first and second probes. Each probe comprises an insulated handheld shield supporting an electrode for contacting a high voltage electrical conductor. The electrode is connected in series with a resistor and a capacitor. A meter comprises a housing enclosing an electrical circuit for measuring phasing voltage. The electrical circuit comprises an input circuit for connection to the first and second probes and an amplifier connected between the input circuit and a display. The amplifier measures voltage across the electrodes to provide an indication on the display.
Claims20
A high voltage phasing voltmeter comprising:
- first and second probes, each comprising an insulated handheld shield supporting an electrode for contacting a high voltage electrical conductor, the electrode being connected in series with a resistor and a capacitor;
- and
- a meter comprising a housing enclosing an electrical circuit for measuring phasing voltage, the electrical circuit comprising an input circuit for connection to the first and second probes, the input circuit comprising a biasing circuit, and an amplifier connected between the input circuit and a display, the amplifier comprising an active compensation circuit with high common mode rejection to eliminate common mode parasitic noise effects and developing an output representing voltage difference between the first and second probes to provide an indication on the display.
A high voltage portable phasing voltmeter comprising:
- a first probe comprising an elongate insulated shield having a handle portion at one end, an electrode extending from a distal end of the shield for contacting a high voltage electrical conductor, and a high impedance circuit in the shield comprising a resistor and a capacitor connected in series with the electrode;
- a second probe comprising an elongate insulated shield having a handle portion at one end, an electrode extending from a distal end of the shield for contacting a high voltage electrical conductor, and a high impedance circuit in the shield comprising a resistor and a capacitor connected in series with the electrode;
- and
- a meter comprising a housing enclosing an electrical circuit for measuring phasing voltage, the electrical circuit comprising an input circuit, for connection to the first and second probe high impedance circuits, the input circuit comprising a biasing circuit, and an amplifier connected between the input circuit and a display, the amplifier comprising an active compensation circuit with high common mode rejection to eliminate common mode parasitic noise effects and developing an output representing voltage difference between the first and second probes measuring voltage across the electrodes to provide an indication on the display.
Dependencies are inferred from the claim text.