Power quality monitoring for fixed installation points
Power quality monitoring at a fixed point gives plant electrical engineers a continuous record of what the supply is doing, rather than a snapshot taken during a one-off audit. LOGGON TECH supplies a fixed monitoring line built around the LOGGON-3W power quality analyzer/monitor, which measures and records to IEC 61000-4-30 Class A and evaluates results against EN 50160, national standards or user-defined parameter sets. The same series includes the LOGGON-3F active power filter as a companion unit, so a monitoring point and a mitigation device can be specified from one product family and one manufacturer. The monitoring system is designated LOGGON-310; the 3W is its measuring unit and the 3F is its companion filter.
What it does
The LOGGON-3W is a power quality meter intended for permanent installation at a distribution point. It performs real-time measurement and recording to IEC 61000-4-30 Class A, the class that defines measurement methods and accuracy for parameters where compliance decisions are made. Recorded data can be evaluated against EN 50160, against the applicable national standard, or against a user-defined parameter set, so the same instrument can serve a compliance report and an internal power quality monitoring system with site-specific limits.
Measurement coverage includes harmonics to the 127th order and interharmonics to 126.5, rapid voltage changes, short-term flicker Pst and long-term flicker Plt. Event triggering captures disturbances, and the unit supports fault (disturbance) recording, fault analysis and alarm outputs. The LOGGON-310 series is positioned with a large high-brightness touchscreen front panel and a modular industrial enclosure; confirm the 3W's configuration against its datasheet. For engineers familiar with a portable power analyzer used for surveys, the 3W performs the same class of steady-state and event measurement but stays connected, so slow trends and intermittent faults are captured without a site visit.
Models and key data
LOGGON-3W power quality analyzer/monitor
| Function | Real-time measurement and recording |
|---|---|
| Measurement class | IEC 61000-4-30 Class A |
| Evaluation | EN 50160, national standards or user-defined parameter sets |
| Harmonics | To the 127th order |
| Interharmonics | To 126.5 |
| Rapid voltage changes | Supported |
| Flicker | Short-term Pst and long-term Plt |
| Event handling | Event triggering, fault (disturbance) recording, fault analysis, alarm outputs |
| Interface | Large high-brightness touchscreen (series positioning; confirm per model) |
| Construction | Modular industrial design (series positioning) |
LOGGON-3F active power filter (companion unit)
| Rated input | 380VAC (-40%~+20%) / 50Hz |
|---|---|
| Filtering result | THDi <= 5% |
| Filtering range | 2nd–50th harmonics |
| Response time | < 10ms |
| IGBT switching frequency | 20kHz |
| Overall efficiency | >= 97% |
| Single-unit capacity | 25A, 50A or 100A |
| Parallel capability | Up to 6 units in parallel |
How it fits together / architecture
A typical arrangement places the LOGGON-3W at the point where supply quality must be evidenced: the incoming feeder of a plant, the busbar feeding a sensitive process line, or the coupling point between a non-linear load group and the rest of the installation. Current and voltage connection arrangements follow the selected unit's wiring documentation, and the unit records continuously while raising alarm outputs on the parameters and thresholds configured for the site.
Where recorded harmonics exceed the limits set for the point, the LOGGON-3F active power filter is applied on the same network. The 3F operates from a 380VAC input, filters the 2nd to 50th harmonic range with a THDi result of 5% or lower, and responds in under 10ms, which suits fast-varying loads. Single units are available at 25A, 50A or 100A, and up to six units can be paralleled for larger feeders. With IGBT switching at 20kHz and overall efficiency of 97% or above, the filter adds limited losses at the point of installation. The practical sequence is to measure with the 3W, identify the harmonic spectrum and its variation over the production cycle, size the 3F from that record, then keep the 3W in place to verify the result.
Applications
- Incoming supply monitoring at plant transformers and main switchboards.
- Feeders supplying variable speed drives, rectifiers, induction furnaces and other non-linear loads.
- Sensitive process lines — control systems, metering and laboratory equipment — where voltage events must be logged.
- Points where EN 50160 or a national standard compliance record must be produced over time.
- Installations where harmonic distortion has been identified and an active filter is to be sized and verified.
FAQ
What is the difference between the fixed monitor and a portable analyzer?
The 3W is installed at a point and records continuously to IEC 61000-4-30 Class A. A portable analyzer is carried between points and used for audits. The two are complementary: the portable instrument surveys the site, and the fixed unit keeps watch afterwards.
Can the evaluation limits be changed after installation?
Yes. The 3W evaluates against EN 50160, national standards or user-defined parameter sets, so site-specific limits can be applied where a standard does not match the installation.
Which harmonic orders are covered?
The monitor measures harmonics to the 127th and interharmonics to 126.5. The companion 3F filter operates over the 2nd to 50th harmonic range.
How is the filter sized for a larger feeder?
Single 3F units are rated 25A, 50A or 100A, and up to six units can be connected in parallel. Sizing should follow the harmonic record taken by the 3W at the same point.
For specification support on power quality monitoring at a specific installation point — measurement class, evaluation standard, harmonic range and filter capacity — send the point details and load data through the contact page.