Atec Phenix-PD2U - Manual (Page 3)

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Quadrupoles
When a quadrupole and a coupling capacitor are used together as the
coupling device, high voltage is applied both to a test object and to the
coupling capacitor in parallel with the test object. A quadrupole (sometimes
called a measuring impedance) can then be placed in series with either
the coupling capacitor or in series with the test object. Some quadrupoles
also output a low-voltage copy of the applied high-voltage wave for
synchronizing with the PD detector.
The CIL quadrupoles consist of an inductor in parallel with a damping resistor.
The inductor and resistor are calculated to form, together with a high-voltage
coupling capacitor, a second order high pass filter. Therefore, matching
the range of the CIL with the size of the coupling capacitor with which it
will be used is important.
The CIL/V quadrupoles are similar to the CIL quadrupoles but also contain
a capacitor acting as a voltage divider together with the high voltage
coupling capacitor. This provides a low-voltage copy of the applied high-
voltage wave that can be used through a HST to synchronize the PD
detector and monitor the quality of the applied high-voltage wave.
Optionally, the quadrupoles with built-in divider capacitor for voltage
measurement can be supplied with a rotary switch to select the divider
capacitor. When connected to the measurement tap of transformer
bushings, the selectable capacitors expand the applicable voltage range.
Model range
CIL4M/V1µ0 Designed for up to 100 kV, 1 nF Capacitor Range,
400 mA max
CIL4M/V2µ0 Designed for up to 200 kV, 1 nF Capacitor Range,
400 mA max
CIL4M/V3µ5 Designed for up to 350 kV, 1 nF Capacitor Range,
400 mA max
CIL4M/V4µ0 Designed for up to 400 kV, 1 nF Capacitor Range,
400 mA max
*Other quadrupoles are available
rPa1 Preamplifiers
The RPA1 is the standard preamplifier for measurements in the low frequency
range according to standards such as IEC60270.
Preamplifiers serve to condition, filter, and amplify the partial discharge
signal to be measured. Because the frequency range in which PD signals
are measured is strongly dependent on the preamplifier used, proper
selection of a preamplifier is an important part of noise mitigation and can
have a strong effect on the appearance of the partial discharge pattern
itself. All external signal conditioning modules and preamplifiers are remote
supplied and remote controlled through a simple coaxial signal cable (RG58).
This technique allows placement of these units close to the sensor or signal
source. Furthermore, as these modules act as an impedance converter
and line driver, the weak signal source, such as voltage divider or coupling
impedance, is not loaded by the cable capacitance or impedance.
This technique also provides enhanced over-voltage protection. All
preamplifiers can drive a 50 Ω cable up to 50 m long.
TECHNOLOGIES
PHENIX
R
frequency range: 40-800 khz
input impedance: 10 kΩ/50 pf
input sensitivity: <200 µV
roll-off: 40 dB/dec
Bipolar
DescriPtion