PD Doctor – Partial discharge diagnostics

PD Doctor Coupler

Three-channel amplifier that boosts the weak signal of partial discharges and prepares it for further processing. This module is responsible for switching ranges, standardizing the signal, or extracting additional MV or HV level information.

PD Doctor Coupler

The coupler unifies signals from various types of sensors for PD Doctor Analyzer. It is also responsible for channel switching, selecting measuring range and providing environmental conditions, such as temperature, relative humidity, and pressure at the module’s location.

Key features:

Multiple sensor types supported (capacitive, inductive)
AC synchronization with line voltage
Up-to 3 channels per unit
Integrated temperature, humidity and atmospheric pressure sensor
Solid construction suitable for outside environment

Capacitive sensor

The capacitive sensor is designed for connecting PD Doctor components to MV equipment directly on live parts up to 22 kV. It is used to collect the signal of partial discharges as well as the synchronization signal.

Inductive sensor

The inductive sensor is designed for connecting PD Doctor components to non-voltage parts of MV equipment, primarily to the grounding wire of the measured device.

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Technical Specifications

Amplifier Parameters

Number of channels	3
Input type	Voltage, current
Bandwidth	60 kHz ÷ 1,5 MHz
Gain	0 / -12 / -24 / -36 dB
Synchronization voltage	15 V_AC
Synchronization frequency	40 ÷ 70 Hz
Connector	RJ45

Environmental Measurement

Temperature	-40 ÷ +85 °C (±1 °C)
Humidity	0 ÷ 100 % (±3 %)
Pressure	300 ÷ 1100 hPa (±1,7 hPa)

Mounting

Mounting	On the wall
Enclosure	Molex 936040024
IP rating	IP65

Environment

Operating temperature	-40 to +60 °C
Storage temperature	-40 to +70 °C
Humidity _{Non-condensing}	0 – 80 %

Power supply

Voltage	12 VDC
Maximum current	0,15 A

Dimensions and weight

Dimension	165 x 195 x 65 mm (D x W x H)
Weight	0,8 kg

PD Doctor Coupler