2903 Oil Test Cell0 pages

2903
Test Cell Liquid Insultants

The precision test cell type 2903 measures the
dielectric properties of liquid insulants such as
insulating oil, i.e. it determines the dissipation factor
tan and the dielectric constant r as well as the
specific resistivity.

DESIGN
The complete test cell type 2903 consists of the actual test
cell type 2903a as well as a pot with built-in heating.

The test cell has been designed as a cylindrical
capacitor with a shielded measuring electrode (guard
ring capacitor) thus avoiding partial capacitances,
which might influence the test results.

The test cell consists of a cylindrical container (highvoltage electrode) with a shielded measuring electrode
inside. The cell is vacuum-sealed by a locking head. It
further includes a socket for the measuring electrode, two
vacuum connections, and a stern thermometer.

The test cell's design is in accordance with the
specifications of VDE 0303, 0370 (Fed. Republic of
Germany),
SEV
(Switzerland)
and
the
recommendations of CIGRE. IEC and ISO, as well as
with ASTM standards (USA).

To conduct measurements the test cell is inserted into the
pot. The sockets far high voltage, the temperature
controller and the temperature measuring bridge are
mounted on the pot's top panel made of insulation
material.

The temperature controller type 2967 with digital
temperature adjustment is used to heat up the test cell.

Always check suitability of the equipment for the
considered test cells. It should also be noted that the
power supply used must have a low short-circuit power
characteristic (e.g. a resonant power supply).

ADVANTAGES & BENEFITS

The test cell is in accordance with international

standards and specifications.
The test cell is heatable.
The temperature is adjustable up to 150°C
The cell can be evacuated, e.g. to degas the
insulating oil.
The electrodes are made of stainless steel.
The test results are reproducible thanks to precise
mechanical design.

To degas the measured liquid (e.g. oil) we recommend our
vacuum pump type 2973.

FEATURES
No-load capacitance ≈ 60 pF
Electrode spacing 2 mm
Amount of liquid
40 cm3
Electrode material stainless steel
Surface
micro finished
Electrode
ambient temperature .. 150°C
temperature
Heating capacity
heating jacket 300 W,. heating
cartridge 150 W, total 450W
Heat-up time
60 min.
Built-in fuses
4A
Max. test voltage
2000 V RMS, 50/60 Hz
Max. electric field
10 kV/cm
Dimensions
0 95x175 mm (3.8x6.9 ins) Test cell
type 2903a
0 240x220 mm (9.5x8.7 ins) Test cell
2903a with heating pot 2903
Weight
5.2 kg (11.5 lbs) Test cell type 2903a
8.2 kg (18 lbs) Test cell with heating
type 2903

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