PD Accessories - Prescon

Maximize benefits of PD test instruments with PD accessories

Whether you need a sensor, measuring impedance, coupling capacitor or calibrator, we offer a complete line of Doble partial discharge testing accessories (PD accessories) to help refine your PD testing capabilities.

With many possible applications for PD testing, accessories can help maximize the benefit of your PD test instruments.

CALIBRATORS

LDC-5 Calibrator

For PD-Smart and LDS-6
For external calibration of the standard PD measuring circuit according to IEC 60270
Quantifying of the main PD quantity “apparent charge”
Output for calibrating pulse charges: 5, 20, 100, 500 Pc

LDC-7/UHF

For PD-Smart
Pulse generator for sensitivity verification of PD measuring circuits operating in the UHF/VHF domain

LDC-5/D

For LDS-6
Double impulse calibrator
For external calibration of the standard PD measuring circuit according to IEC 60270 (single pulses)
PD measurements on long cables and in accordance with standards requiring the verification of the double pulse behavior of the employed PD measuring system
Produces these standardized time parameters according to the IEC 855-3
Output for calibrating pulse charges (5, 20, 100, 500 pC)

LDC-5/RIV

For LDS-6
External RIV calibrator for standardized PD measuring circuit according to IEC 60270
Quantifies “apparent charge”
Magnitude of the calibrating pulses can be selected by the “Charge Magnitude” switch

LDC-5/S2

For LDS-6
Charge injector designed for simulation of PD pulses, especially for on-site PD testing
Generates five different charge magnitudes, which appear at the 5 BNC-jacks
Calibrating charge can be fed into the terminals of test sample (according to IEC 60270 and DIN VDE 0434)

SENSORS

PDDC-17 PD Decoupler

For use with rotating machines
Designed for PD signal transmission with a bandwidth above 30 MHz at 50 Ohm matching resistance
PD decoupling unit with integrated PD measuring impedance for decoupling of PD pulses from the standard PD measuring circuit according to IEC 60270
Voltage signal for phase resolved measurements
Composite PD and voltage signal, additive superimposed

PDDC-24—Failsafe & LF Coupler

For use with rotating machines.

Designed for PD signal transmission with a bandwidth above 30 MHz at 50 Ohm matching resistance. It also transmits test voltage signals at the same wire.
PD decoupling unit with integrated PD measuring impedance for decoupling of PD pulses from the standard PD measuring circuit acc. to IEC 60270
Voltage signal for phase resolved measurements
Composite PD and voltage signal, additive superimposed
Integrated high-voltage fuse

BC Matching Unit

For use with rotating machines
Works with your previously installed couplers for PD testing in rotating machines
Designed to adapt conventional PD measuring methods to the 80pF-Line coupler
Improves signals from existing couplers
Avoids outages that would be needed to replace high frequency couplers with low frequency couplers

LDM-5 /SP1

For use with PDDC-range in combination with PD-Smart or LDS-6
Splitting box designed for PD/TV-signal transmission
Compact device with all input and output lines at the sides
Includes fast overvoltage protection to help prevent dangerous overvoltage due to unexpected breakdown of the test sample

Connection Boxes

For use with LDM-5/U5
Connection Boxes are designed for PD/TV-signal transmission and diplexing
Two and three channel connection box options

DA100 Directional Antenna

For use with PD and RFI Surveyors
Provides more specific location of Radio Frequency Interference (RFI) and Partial Discharge (PD) sources.
Can be handheld or mounted on tripod
Bandwidth 250 MHz – 1 GHz
Diameter: 290 mm

HFCT sensor

For use at cable terminations
Clip-on
10 kHz – 200 MHz

HFCT-300 sensor

For use at cable terminations
Hand-held split-core sensor specially designed for coupling out high frequency PD-signals
Applicable for PD tests on any part of the PD signal loop between the insulation electrodes where the outgoing and incoming signals do not cancel each other out
For highly sensitive PD measurements with superposed line currents or high reactive currents (50/60 Hz) which can reach up to 300 A

LDWS-T Sensor

For use at HV cable terminations
For decoupling of PD signals (TNC-socket)
High impedance version
For ungrounded and grounded devices

UHF Drain Valve Sensor DN50/DN80

For use with HV Transformers
Designed for decoupling of electromagnetic PD signals from inside of transformers
Sensor fits into DN 50 or DN 80 drain valves
Supports “Performance/Sensitivity Check” where high frequency test pulses can be injected with further integrated electrodes
Grounded sensors (for low frequencies)

UHF PD Plate Sensor

For use with HV Transformers
Used for the decoupling of electromagnetic UHF PD signals from the inside of the transformer tank
Designed to retrofit transformers that do not have oil flanges with free internal tubes
Can be installed on new transformers during manufacturing
Used for testing and optimizing mechanical properties such as oil-tightness, thermal withstanding of changing temperatures and pressure withstanding

TEV-Probe

For use in GIS
Capacitive sensor for metalclad switchgear
Connects to PDS100/PDS200/DFA300 and PD-Smart

UHF Spacer Sensor

For use in GIS
Antenna for polymeric spacers or glass inspection windows
The sensor can be placed across a joint on a GIS to find evidence of partial discharge inside

Sensor Pre-Amplifier

For use with all kind of UHF sensors
High sensitivity and high gain sensor amplifier
Special protection circuitry protects the input against excessive input power
Integrated soft start reduces the maximum peak current when powering up

MEASURING IMPEDANCES

LDM-5/U5

For cable and transformer testing
General use measuring impedance designed for the decoupling of the PD current pulses on the PD coupling capacitor, changing in equivalent voltage pulses and forwarding to the PD detector (according to IEC 60270)
Voltage signal for phase resolved measurements by an internal low voltage capacitor for measuring test voltage and forwarding to PD test equipment
Output for test voltage value, derived from the coupling capacitor
No additional HV divider capacitor is necessary
With up to 2 switches for maximum 4 different coupling capacitances

LDF-6/FU

For use with LDM-5/U5
Band pass filter designed to improve electromagnetic compatibility in the measuring surroundings
Reduction of the disturbing influence of high frequency currents
Use between a measuring impedance and PD device

LDM-5/U5 RIV

For transformer testing
Designed for the decoupling of the PD current pulses on the PD coupling capacitor, changing in equivalent voltage pulses and forwarding to the PD detector (according to IEC 60270)
Connects to a bushing tap or a coupling capacitor
Low voltage capacitor for measuring test voltage and forwarding to PD test equipment
Voltage signal for phase resolved measurements
Output for test voltage value, derived from the coupling capacitor
No additional HV divider capacitor is necessary

Coupling Capacitors

For use with LDM-5/U5
The coupling capacitor connects the high voltage with the PD-measuring device
Mobile and equipped with the suitable security procedures
Capacitance 1 nF
- CC1000/60: Rated Voltage 60 kV
- CC1000/120: Rated Voltage 120 kV
Capacitance 10 nF
- CC10000/50: Rated Voltage 50 Kv

LDM-6/3

For use with Coupling Capacitors
Designed for the decoupling of the PD current pulses on the PD coupling capacitor, changing in equivalent voltage pulses and forwarding to the PD detector (according to IEC 60270)
Voltage signal for phase resolved measurements by an internal low voltage capacitor for measuring test voltage and forwarding to PD test equipment
Voltages decoupled from the bushing tap together with the PD signal
One signal output (TNC-socket) for voltage signal with added PD signal

LDM-5/M8 Switching Box

For use with specially designed LDS-6 control software
Signal switch, specially designed for PD applications
Stores all measured PD data for each channel separately (8 measuring files)
Can customize a test procedure (test time, sequence of activation of the measuring impedances)

Contact

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