High voltage insulation testing system

Electricity: power supply or regulation systems – For reactive power control – Using impedance

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Details

324 54, 363 37, G01R 3112

Patent

active

043385613

ABSTRACT:
The high voltage testing system contains a series resonant circuit connected to a voltage source with a continuously variable frequency, whereby the insulation, connected in series with the inductor, which is being tested, either exclusively or at least partly, forms a part of the capacitance. The inductance may consist of several high voltage inductors constructed of modular elements. It is advantageous to use bar-core chokes.
Preferably, the bar-core choke is suspended in the mass center by means of a mounting plate. Suitably, the coil of the inductor consists of two windings, each having a trapezoidal cross section.
A static frequency converter would be suitable as a voltage source with variable frequency; the converter could be a direct converter built to act as an oscillating circuit converter, operating within the resonance frequency and with pulse-width control. At least one high-voltage capacitor may be connected in parallel to the insulation for the adjustment of the desired frequency. The advantage of this testing system for the testing of an insulation lies in the fact that this system permits testing with frequencies which are lower or higher than the line frequency. The testing system is small and very light-weight and contains elements which are more economical than was heretofore known.

REFERENCES:
patent: 2222221 (1940-11-01), Burford
patent: 3703692 (1972-11-01), Peschel
patent: 3736493 (1973-05-01), Rosenthal et al.
patent: 3781667 (1973-12-01), Tuttle
patent: 3821640 (1974-06-01), Bahder et al.
High Voltage Engineering, E. Kuffel et al, Pergamon Press, pp. 98-109, Oxford, 1970.
R. Reid, World Electrotechnical Congress, Section 1, Report No. 29, Jun. 21-23, 1977.
Resonant AC Dielectric Test Systems, Hipotronics (Pamphlet Undated).

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