Partial Discharge Monitoring
CONTINUOUS PD MONITORING ∙15+ CHANNELS
DYNAMIC RATINGS
RMM
ROTATING MACHINE MONITOR
| C/ María Barbeito, 14 | Contact Contact T [+34] 982 20 99 20 |
|---|---|
| 27003, Lugo, Spain | T [+34] 982 20 99 20 info@amperis.com | www.amperis.com |
Continuous partial‐discharge monitoring that protects the reliability and uptime of your rotating machines.
Your system's uptime matters
The Rotating Machine Monitor (RMM) raises plant reliability, lifting uptime and trimming maintenance costs. It watches partial discharge continuously while also logging and correlating the machine's operating dynamics, capturing every industry‐standard PD graphical result together with the quantities defined by IEC. Motors are critical assets: IEEE and EPRI studies attribute up to 40% of electrical‐origin failures on high‐voltage motors to stator‐insulation problems, most of them triggered by partial discharge in windings and cables. The RMM reports on that insulation's health in medium‐ and high‐voltage motors, generators and VFD‐driven machines.
Features & functions
Built around innovative sensors, monitoring hardware and controls for acquisition, analysis and diagnostics, the RMM works alongside asset‐management tools so operators draw the full value from online and partial‐discharge monitoring. It brings a complete range of advanced noise‐cancellation techniques — including the removal of cross‐coupled signals — and tracks the operating context that matters: ambient and winding temperature, humidity and load.
Optimal design
At least fifteen independent, simultaneously monitored and user‐configurable channels deliver an industry‐leading signal‐to‐noise ratio and accept PD sensors of any brand. Beyond PD, the unit reads six RTD winding temperatures, three load currents, three voltages and six user‐defined 4‐20 mA inputs, and can run motor‐current‐signature analysis to reveal broken rotor bars in induction machines. Up to two years of data are held on a first‐in, first‐out (FIFO) basis.
Independent operation, open communications and reuse of existing sensors — for fast, low‐disruption deployment.
Communication & implementation
Effective communication
The RMM keeps asset‐management and maintenance teams informed in good time. It can work on its own, with no PC connected, yet still provides a broad set of built‐in interfaces — Ethernet, USB and RS‐485 — using ModBus as the standard protocol, with DNP‐3 available on request.
Easy implementation
Designed to run with PD sensors that are already installed, the RMM avoids the purchase, engineering and installation costs of fitting new ones. Placed inside an approved enclosure, it can also be deployed in a wide variety of locations.
Optional hazardous‐location enclosure
For demanding sites, a hazardous‐location enclosure is offered in 316 stainless steel — the best choice for aggressive environments — with a gasketed flange whose O‐ring seats inside the cover bolts to seal the unit. It is certified to Class I, Division 1 (Groups B, C, D); Class II, Division 1 (Groups E, F, G); and Class I, Zone 1, IIB T4.
Optional hazardous‐location enclosure (316 stainless steel)
Reaching partial discharge deep in the windings — and driving a full analysis toolset.
Applications & software
Applications
Coupling capacitors sense partial discharge only near the machine terminals; the RTD‐PD module reaches the discharge that occurs deep inside the windings, where the RTDs already respond to its high‐frequency content. Used together, the two techniques widen the detection zone. Whatever the machine, four parameters are recommended for correlation with PD: winding temperature, ambient temperature, relative humidity and load current. A typical arrangement for turbos, small hydro sets and motors uses two sets of coupling capacitors — one at the line terminals and one in the isolated‐phase bus duct, at least two metres apart for a time‐of‐arrival measurement; large hydro generators often need two to four sets, one per parallel‐phase group, with coaxial‐cable lengths trimmed for correct time‐of‐arrival calibration.
Software package
The bundled Windows software drives portable and continuous insulation‐monitoring systems across generators, motors, switchgear, cables, bus duct and transformers, letting users configure the instrumentation, download and store data, and analyse it with a full toolset.
Test results are presented in every industry‐standard format; all standard quantities can be trended and several channels compared on one screen.
Graphic results
2D phase resolved
3D phase resolved
Polar phase resolved
Magnitude vs. phase angle across the AC cycle
Phase‐resolved view with pulse count as third axis
The distribution mapped around the phase circle
Trend
Evolution of the quantities over time, by channel
Product specifications — Rotating Machine Monitor (Dynamic Ratings RMM)
| Detector characteristics | Array size/format PD channels | 15 per module, concurrent data acquisition |
|---|---|---|
| Field of view/min focus distance Spatial resolutions(IFOV) Dynamic range | 0,79mrad or 1,13mrad 70 dB, 3 mV to 10 V, no gain adjustment | |
| Image manage Acquisition | NETD Frame rate Measurement bandwidth | @30 60Hz 1 MHz to 20 MHz |
| Image manage | Frame rate Focus Zoom Phase resolution | 60Hz Auto / Manual / Motorize 1-4x electronic zoom 7.5° (power frequency) |
| Zoom Spectral range CCD Magnitude windows | 1-4x electronic zoom 1,3 million CMOS 32 | |
| Image display | CCD LCD RTD winding temperatures | 1,3 million CMOS 6 |
| Image display Auxiliary inputs | LCD Temperature ranges Load currents / voltages | -40 3 / 3 |
| Accuracy Measurement correction User‐defined inputs | ±2 or ±2% of reading, whichever is greater Auto/Manual 6 × 4‐20 mA | |
| Mode Internal memory | 8 MB | |
| Measurement Data, interface & comms | Image control Color pallete Image adjustment Data storage | 11 pallettes changeable (Iron, Rainbow, Grey and Grey inverted, etc) t Auto/Manual adjustment of contrast and brightness ≈2 years, first‐in first‐out (FIFO) |
| Data, interface & comms | Setup Emissivity correction User interface | Variable from 0.01 to 1.0 PC (Windows software) |
| Emissivity correction Background temp adjustment Atmospheric transmission correction Communications | Variable from 0.01 to 1.0 Auto, according to the background temp n Automatic correction according to user input object distance, humidity and temperature Ethernet, USB, RS‐485; ModBus (DNP‐3 optional) | |
| Power & environment | Atmospheric transmission correction Storage Card Storage Mode Power requirement | n Automatic correction according to user input object distance, humidity and temperature 8G SD card, storage > 6000 Manual/automatic single-frame image storage, continuous visible, infrared video recording 90‐264 V AC (47‐63 Hz); 100‐300 V DC |
| Power & environment | Storage Mode IR image Single frame Operating temperature | Manual/automatic single-frame image storage, continuous visible, infrared video recording JPEG, 14 bit thermal image with measurement data ‐40 °C to 70 °C (hazardous enclosure: ‐20 °C to 40 °C) |
| Image Save | IR image Video Visual image Single frame Mounting options | MPEG-4 or 14 bit thermal image with measurement data JPEG Standalone, panel‐mounted, enclosure‐mounted, hazardous‐location |
| Enclosure & certifications | Visual image Video Voice annotation Hazardous enclosure | MPEG-4 40s., saved together with the image 316 stainless steel with gasketed flange |
| Laser pointer | Image improvement Power supply Certifications | Class I Div 1 B/C/D; Class II Div 1 E/F/G; Class I Zone 1 IIB T4 |
| Contact Contact |
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Mounting options and mechanical dimensions for every configuration.
Dimensions & mounting
Standalone (S)
Panel mounted (P)
Enclosure mounted (E)
Hazardous‐location (H)
Mounting hole A
Mounting hole A × B
Mounting hole A × B × C
1: 31.75 × 35.56 × 22.86 cm (12.5 × 14 × 9 in) 2: 46.99 × 54.61 × 27.94 cm (18.5 × 21.5 × 11 in) 3‐4: consult factory