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Smart DiagnosticMonitoring Technologies

PD700A complete Partial Discharge (PD)monitoring system for Gas InsulatedSwitchgears (GIS).

Key Features▶ Online Measurement▶ PD Location▶ PD Expert System▶ Advanced Data Display

Benefits▶ Reliable PD monitoring▶ Competitive Cost▶ Remote Monitoring▶ IEC 61850 ready

Knowing you have PD (partial discharge) is a worry,knowing where the PD is allows you to make risk as-sessments. The highly advanced timing system inthe PD700 allows the location of the PD to be calcu-lated within the GIS. The PD700 system can provideautomated simple results, or advanced screens forexperts even down to showing the pulse timing se-quences between channels.

The PD700 offers unrivalled features for a cost effec-tive solution. Monitor full GIS substations with onesimple system. Local units (LAUs) are mounted atconvenient location close to the GIS. Simple daisy-chain style connections means fast and simple instal-lation between LAUs and server. Automatically gen-erated warnings for PD within the GIS before failureoccurs.

The unique PD Intensity is used to measure the en-ergy in the PD. Advanced analysis developed from ex-perts in the field of GIS and PD signals. The combinedresults give accuratewarnings thatminimise the falsealarms for the operator.

Dedicated hardware allows the location of the PD tobe calculated. Knowing where the PD is located is asimportant as detecting PD. Only with the location in-formation can the true risk be assessed. This builtin feature avoids costly site visits from PD experts tolocate the signal.

The location system has the additional benefit of re-moving the same signal being seen onmultiple chan-nels. A common problem of UHF PDM systems is tohavemany additional signals spread across a numberof sensors. This is no longer a problem for the PD700,the operator need only look at one signal from eachPD source.

SDMT Ltd.South Oaks, Main RoadCardross, G82 5JYUnited Kingdom

Tel: +44 141-5309470Fax: +44 141-5309471

[email protected]


Installation is simplified by the daisy-chain configu-ration. 2 fibres and 1 power connection link unit tounit. The PD700 system self calibrates to allow thetime of arrival results to be accurate to better than1 nanosecond. The far end of the daisy-chain canbe linked back to the server to provide an alternatedata path for security. A star configuration can beused over Ethernet, however, the precision timing be-tween units is only available if the daisy-chain fibre isconnected. Standard Ethernet is not suitable for tim-ing between units.

The graphical interface and monitoring system is notlimited to the GIS or PD700. Many of the installedmonitoring systems from SDMT can be added on toextend the system to monitor other parts of the sub-station.

The PD700 systems is designed to work with mostUHF PD sensors. SDMT recommend a minimumspecification for best results, or can design specificsensors for any application within a GIS. ContactSDMT for further details onUHF sensor suitability anddesign.


Tel: +44 141-5309470Fax: +44 141-5309471

[email protected]


The main software interface is sim-ple enough to be used with mini-mal training. A full range of trends,patterns and parameters are avail-able for the expert user. Cus-tom real views can be used if avail-able, or any other representation ofthe GIS. Basic parameters are dis-played on the real and schematicviews.

PRPD

3D sequence

PD LocationPD Trends Multisource selection

Manual parsing of the data is through the interactivegraphical single line diagram. Any custom screens canbe added to the software to represent the GIS or sub-station components. A simple traffic light system showsthe operator where to look for problems. The operatorneed only look at the more in depth data when needed,saving unnecessary time wasting.


Tel: +44 141-5309470Fax: +44 141-5309471

[email protected]


SpecificationsNumber of PD channels per unit 6

Maximum number of units 100+ (600+ HF/UHF channels)UHF PD frequency bandwidth 300MHz to 1500MHzUHF PD amplitude range -75 to -5dBmPD location accuracy <50cm

Communication interfaces Fiber Ethernet, USB, RS-485Connectivity output SCADA, IEC61850Input power supply 90V to 260V, AC (50/60Hz) or DC

Operating temperature range -20◦C to 70◦CRelative humidity range not more than 95%, non-condensing


Tel: +44 141-5309470Fax: +44 141-5309471

[email protected]

sdmt - [email protected] smartdiagnostic monitoringtechnologies...

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