BAUR PHG 80 TD PD -- Strengthen Medium-Voltage Cable Diagnostics

For medium-voltage cable networks, accurate condition assessment has outgrown the withstand test. A feeder can pass a VLF test and still be two years from failure — because a pass/fail result cannot describe ageing, and it certainly cannot tell you which joint is the weak point in a three-kilometre run.

The BAUR PHG 80 TD/PD is aimed exactly at that gap. BAUR describes it as a multifunctional cable testing and diagnostics system that gives a comprehensive picture of the quality and ageing condition of the test sample, combining the three diagnostic layers in one integrated platform.

Why tan delta and PD belong together

These two methods are complementary, not competing, and BAUR's own positioning makes the split explicit: one assesses the overall condition and ageing of the cable insulation, the other locates individual faults.

The practical consequence: TD alone can put a feeder on the replacement list without telling you whether the problem is the cable or one joint that could be cut out. PD alone can find a discharge site without telling you whether the rest of the run is worth repairing. Together they support a decision, which is the difference between a diagnostic campaign and a pile of measurements. Our article on combining tan delta and PD diagnostics covers the interpretation in more detail.

PHG 80 TD versus PHG 80 TD/PD

BAUR builds the PHG 80 platform in two diagnostic configurations, and this is the decision that matters most at quotation stage:

That last row is the reason this page exists. Choosing TD-only and then discovering a PD requirement means replacing the instrument, not upgrading it. If PD is in your specification, in your regulator's expectations, or anywhere in a five-year plan, the TD/PD configuration is the one to price.

Hardware and deployment

BAUR builds the system around a 3 kW VLF truesinus® testing device with regulated output voltage — a high-performance source for both testing and diagnostics rather than a separate test set plus add-on analysers. Other published characteristics that matter in the field:

• Compact enclosed 19-inch design — rack-standard, which simplifies both vehicle installation and lab use
• Variable installation options with separate control and voltage units, plus flexible connection options for different cable station configurations
• Suited to fixed and mobile testing environments — BAUR positions the PHG platform for installation in cable test vans

If the programme is van-based, the integration route is the TITRON cable test van and the wider cable test vans and systems range. If you need the same diagnostic concept without a vehicle, the PHG 80 Portable is the mobile configuration.

The workflow around the instrument

What turns measurements into a condition assessment is the software and process layer. BAUR combines the PHG 80 TD/PD with its PD workflow tools and BAUR Software 4 to deliver:

• Visualisation of partial discharge levels and positions, dissipation factors, voltage curves and trend displays
• Software-supported automation for measurement control and documented calibration
• Comparison of PD signals for precise fault location
• Planning, evaluation, central documentation, report generation and long-term trend analysis across a network

Two practical notes we give customers planning this layer. First, plan where the data lives before the first campaign, not after — the value of this system is the history it accumulates. Second, ask BAUR or your distributor to confirm the current division of work between the PD workflow products and Software 4 for your configuration; the feature set has evolved across generations, and this page describes the workflow outcomes rather than each module's current role.

When PD is a requirement rather than a bonus

PD capability adds cost, so it is fair to ask when it is genuinely justified. In our experience with Canadian MV networks, PD earns its place when any of these are true:

• The cable population is old enough that localised defects, not general ageing, drive your failures
• Your failure history points at joints and terminations rather than cable body
• You are managing XLPE cables with suspected water treeing, where discharge activity is an early indicator
• The asset owner's specification or insurer requires PD measurement before energisation
• You need to decide between repairing one section and replacing a feeder — this is precisely the TD + PD decision
• The network is critical enough that an unplanned outage carries a regulatory or safety consequence

Conversely, if your work is acceptance testing on new installations and you have no ageing population to trend, a VLF test set such as the viola will do the job for a fraction of the cost.

Where each model sits in the range

For the wider method picture — including fault location, sheath testing and cable identification, which are separate jobs from diagnostics — see the cable diagnostics guide and the BAUR application guide.

Buying, renting and supporting PD diagnostics in Canada

RCC Electronics supplies the BAUR cable testing and diagnostics range in Canada and supports the programme around it. The PD-capable PHG configurations are capital purchases rather than rental items, but the path to them does not have to start with a purchase order: Frida TD, TDR811P, Protrac and SHIRLA are all available for rental, which is how most teams run a first diagnostic campaign and build the internal case for a PD-capable system. Calibration and service are handled in-house — see our services. Background material is in the PD FAQ, the VLF + TD + PD FAQ, the cable testing brochure and the PD video library.

FAQ: PHG 80 TD/PD and partial discharge diagnostics

What is the difference between the PHG 80 TD and the PHG 80 TD/PD?
Both do VLF withstand testing and tan delta diagnostics. The TD/PD version adds partial discharge diagnostics and PD-based fault localisation. PD cannot be added to a TD-only instrument later, so this choice is effectively permanent.

Why do tan delta and PD need to be used together?
They cover each other's blind spots. Tan delta describes overall insulation ageing but can hide a single bad joint; PD finds localised defects but says nothing about the condition of the rest of the cable. Together they support a repair-or-replace decision.

Can the system be installed in a test van?
Yes. BAUR notes the PHG platform is suitable for installation in cable test vans, and the compact enclosed 19-inch design with separate control and voltage units is intended to make both fixed and mobile configurations practical. See our cable test vans range for integration options.

Does PD testing require an outage?
Yes. The cable must be isolated, discharged and grounded before connection, so diagnostic work is scheduled with outages or planned switching. Note also that a comprehensive safety concept with automatic discharge is part of what makes these systems practical for repeated field use.

When is a portable VLF/TD set enough instead of a PHG-class system?
When the work is dispersed, low-volume, or limited to acceptance testing, and when partial discharge is not in your specification. See the portable versus built-in comparison for how that decision is made.

Can I rent a PD-capable system in Canada?
The PHG platform is a purchase-class system, but VLF and tan delta units, TDR, pin-pointing and sheath fault location equipment are all available for rental — a practical way to run a first campaign before committing to a PD-capable purchase.

See the PHG 80 TD/PD System Ask RCC About PD Diagnostics

* The 3 kW VLF truesinus® source, regulated output, 19-inch enclosure and installation characteristics are BAUR-published descriptions for this platform and should be confirmed against the current datasheet for your configuration. Software workflow capabilities are described at the level published by BAUR; confirm the current feature set and module roles with your distributor. Test voltages, durations and evaluation criteria are governed by the current standard text and the asset owner's specification.