General Description; Principle Of How It Work - koban KVD-01-33 Mode D'emploi

2. General description

The range of capacitive high voltage detectors has been designed to
meet the requirements of the latest International IEC standards
(IEC 61243-1).
They may be used indoors and outdoors in all weathers. The
detectors are intended for use on high voltage systems but not in
switchgear.
Models are available to cover a wide range of system voltages.
The function of the detector is to determine whether a
conductor is energised or de-energised so that it may be safely
earthed before commencing work.
Protection class : IP65.
3. Principles of how it work
A strong cone shaped nylon moulding houses the detector. The
inner wall of the cone has a conductive screen coating to which the
earthy parts of the circuit are connected.
This screen coating is capacitively coupled to the earth of the
capacitor (The internal sensing capacitor is different from voltage
range to voltage range).
High voltage appearing at the electrode is divided down and the
voltage across the sensing capacitor is proportional to the voltage
between the electrode and earth.
This proportional signal voltage is fed to the electronic circuitry
whose output drives an audible warning device and a system of
indicating lamps.
set at the factory or set by an authorised calibration facility.
This range of capacitively coupled high Voltage Detectors uses
multilayer boards with ground planes all over the board, eliminating
false or noisy signals.
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