The online Partial Discharge Detector (PDD) from ohv diagnostic is a comprehensive tool for assessing the dielectric condition in rotating machines, GIS, Transformers, Generators, HT Cables, Switchgears. By way of periodical monitoring of the partial discharge behavior within the insulation structure, the operational reliability of the insulation in critical equipment can be assessed. And it helps generate valuable information for maintenance planning and repairs when they are required. Or in many cases PD assessment can help avoid or postpone the inspection and maintenance plans to prioritize the operational availability of the assets. ohv diagnostic’s Partial Discharge Analyzer works based on IEC or UHF signal detection and covers the broad frequency range as per IEC 60270 or IEC TS 62478 and is designed for a very sensitive on-site PD measurement for assessing insulation defects within rotating machines, GIS, Transformers, Generators, HT Cables, and Switchgears.

ohv diagnostic’s PD analyzer can be configured with any standard Coupling capacitor (superimposed or separate PD and Voltage signals) or with UHF decoupling sensor package like UHF sensors for cable sealing end, UHF drain valve & hatch sensors for transformers or window sensors for GIS.

The PDD analyzer offers flexibility of up to 6 multiplexed or synchronized channel measurements to facilitate measurements form multiple sensor inputs at a given location and perform better analysis. Even a combined PDD with IEC- and UHF-signal detectors within one housing is possible. The Hardware is ready for either hard- and software upgrades like Gating, VLF, DC pulse count and PD fault location.

The unit is available with an optional large on-board display and battery backup to facilitate use in outdoor areas where there is no power nearby, and also offers a lower noise floor. Devices with on-board display allow the storage of measurements for viewing them later either on the device itself or transfer to external storage via USB.

Features of the PDD:

•  Provides multiple channels for phase synchronous partial discharge measurements.

•  PD measurements in compliance to IEC 60270 and / or IEC TS 62478.

•  Dynamic auto ranging for consistent measurement response.

•  Easy access via web browser for easy parameterization.

•  User-friendly ohv suite software for high quality measurement and analysis of defect.

•  Covers IEC, broadband and UHF frequency range.

•  High sensitivity, excellent signal to noise ratio

•  weatherproof outdoor housing available, Protection class IP 67

The online Partial Discharge Monitoring System (PDMS) from ohv diagnostic is a comprehensive monitoring system for assessing performance of the dielectric condition in rotating machines. By way of long-term monitoring of partial discharge behavior, the operational reliability of the insulation in critical machines can be assessed on real-time basis. And it helps generate valuable information for maintenance planning and repairs when they are required. Or in many cases PD assessment can help avoid or postpone the inspection and maintenance plans to prioritize the operational availability of the assets. The key element of the PDMS is the partial discharge data acquisition (DAQ) unit which detects the high frequency PD impulses from the sensors, converts them into data packages sending them via fiber optic cable to the server. The partial discharge data acquisition unit consists of a multiplexer with several inputs as per application, signal conditioning, an analogue/digital converter, a digital signal processor converting the PD impulses to time stamped PD and Voltage data. A PDMS generally includes data acquisition units with sensors and a server together with data visualization, storage and connectivity facilities, such as a workstation or an interface to a SCADA or DCS system. The specific configuration and topology strongly depends on the assets to be monitored and requirements to data acquisition and analysis. The DAQ unit are integrated in a single housing. They are assembled in a weatherproof Ingress Protection (IP) class IP55 cabinet.

Sensing Features

■       Meets applicable IEC and IEEE standards

■       Covers IEC, broadband and UHF frequency range

■       High sensitivity, excellent signal to noise ratio

A class of compact, lightweight, and versatile DAC MV and HV cable test systems featuring withstand voltage test, PD analysis and PD localization

The Damped Alternating Current (DAC) M30, M40, M60, H200 and H300 by ohv diagnostic is an exceptionally compact, lightweight, and versatile class of systems for testing and diagnosis of medium and high voltage transmission cables. They are programmable and feature automatic withstand voltage test, partial discharge (PD) measurement and analysis as well as PD localisation. Control and analysis are user-friendly using the OHV Suite which is the common software platform for the complete range of ohv diagnostic products. As additional feature also a cable sheath test can be performed.

DAC cable testing is not only a basic “good or bad” measurement tool but an advanced analysis and diagnosis concept. It allows to assess the cable insulation condition of newly installed, repaired or service-aged cable systems and thus supports asset management. The measuring mode includes

-  Voltage withstand test at voltage level representing operational stress and above as well as

-  Partial discharge measurement, analysis, and location along complete cable systems.

DAC voltage test and PD analysis allow reliable detection of

-  Insulation deficiencies caused by installation or laying,

-  Deficiencies of the cable accessories, i.e. joints and terminations

-  Cable insulation deterioration due to aging processes.

Efficient test environments for high voltages

Tailored to your specific requirements, our high-voltage testing technology provides the test environment for testing your components.

Customized PD measurements and high-voltage tests on site and in-house

Tailored to your specific requirements, our high-voltage testing technology provides the test environment for testing your components

AC and DC high-voltage test systems incl. Shielded cabins and partial discharge measurement

DC and AC voltage test systems with customer-specific programmable voltage-time-load profiles

Simply talk to us about your specific requirements - for your perfect test environment.

ohv diagnostic is the ideal partner for the planning, construction and installation of customized high-voltage and test systems, which are planned and built optimally and cost-effectively according to customer specifications. ohv diagnostic has developed proprietary measurement and control software for these systems that ensures safe operation in compliance with standards. This software also enables a fully automated inspection process, which can be linked to database software that allows the results to be assigned to the various items inspected. The test systems also include optional PD measuring cabins with fully automatic partial discharge measurement integrated into the test sequence, which enables a "pass - fail" assessment in accordance with the test criteria.

ohv diagnostic offers a full range of accessories like calibrators, pulse injectors and filters. furthermore we have all kind of sensors for conventional and UHF frequency range for all type of applications in our scope

ohv diagnostic offers a comprehensive PD monitoring solutions for MV switchgears for continous of period objective. The PD solutions are ideal for metal clad air insulation switchgears, compact GIS system, CSS as well as bus bar systems.

The monitoring system can be used with choice of sensors like Ultrasonic, UHF, HFCT based on a specific need of a client and apparatus design type so that optimal signal acquisition is made possible. The sensor type is designed with high sensitivity and noise related challengs in mind. The data acqisition from the sensor could be with conventional or non-conventional tecqnique based on client needs.

The online PD monitoring solutions from ohv diagnostic has wider installation base ranging from Oil and Gas, Petroleum and Refinery sector to fertilizer and heavy engginering industry. Online PD solutions from ohv diagnostic are highly appreciated for its excelent value offered and many emerging defects have been arrested to prevent catastrophic failures. Delivers a "bang from every buck".....literally.