GDSC-200kV/100pF Standard Capacitor/Calibration Standard for Tan Delta
I. General Information
In every high-voltage laboratory and test, compressed gas standard capacitor is an important instrument, in these occasions, it plays a very important role. In the dielectric loss test, compressed gas capacitors are used to measure the capacitance and dielectric loss tangent (tgδ) of capacitors, cables, bushings, insulators, transformer windings and insulating materials. Moreover, it can also be used as a voltage divider in high voltage measurement. Under certain conditions, it can also be used as a high-voltage coupling capacitor in partial discharge measurement.
II. Features
The capacitance (C) and dielectric loss (tgδ) are extremely stable.
The influence of changes in air pressure, temperature and humidity on the capacitance is small and can be ignored.
The dielectric loss of itself is small.
III. Structure
The shell is composed of an insulating sleeve and a bottom and cover made of steel plate. The bottom and cover are fastened at both ends of the insulating sleeve with bolts and rings. The upper and lower ends of the capacitor are provided with anti corona covers.
The capacitor shell is equipped with coaxial, highly polished cylindrical high and low voltage electrodes.
The capacitor is equipped with a pressure gauge and an air valve for observing the internal pressure and charging and discharging.
The capacitor is filled with SF6, and the external shielded socket can be used with all kinds of bridges and plugs of all kinds of automatic dielectric loss meters at home and abroad.
IV. Specifications
Rated voltage: 200kV
Test voltage: 240kV
Rated capacity: 100pF
Measurement error: <±0.05%
Actual capacitance deviation: <±1.5%
Dielectric loss tgδ: <2×10-5
Temperature coefficient α: <5×10-5/ºC
Pressure coefficient: <2.2×10-3/ Mpa-1
Filled with SF6 gas: at 20ºC, the pressure is 0.35±0.05Mpa
PD value: <5pC
Conditions of Use
The capacitor is installed and operated at an altitude of no more than 1000 meters, and the ambient air temperature: -10ºC-40ºC;
The relative humidity does not exceed 70%;
The operating frequency of the capacitor is 50 Hz.
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