Nexus 1450

IEC 61000-4-30 class A edition 3 measurements, six communication ports and up to 1024 samples per cycle

Transducer base with separate display, 0.06 % accuracy

Nexus 1450

Cyber secure power quality meter

A transducer base with a separate display, so it can be fitted to existing switchboards without cutting the panel door.

Two sensing stages on every current input

Each current input carries a high gain sensor and a low gain sensor that measure the signal from the external current transformers at the same time. The meter reads the signal level and chooses the optimal sensing circuit, which holds 0.06 % accuracy across an extended measuring range. Pick-up starts at 1 mA and full accuracy is reached at 25 mA, so the same meter serves 5 A and 1 A secondary current transformers.

Advanced energy metering

• Full four-quadrant metering with maximum and minimum recording and time stamp.
• Transformer and line loss compensation for iron, copper and total substation losses.
• Coincidental readings, such as power factor or reactive power at the time of peak demand.
• Load aggregation through pulse inputs, including gas and water commodities.
• Perpetual time-of-use calendar with multiple tariffs for complex contracts.

Built for retrofit

• The transducer base is a direct physical retrofit of the previous 125x series meters.
• The separate display mounts into existing analogue meter knockouts.
• Eight built-in digital status inputs, an auxiliary voltage input and two pulse outputs as standard.

Accuracy holds from the bottom of the range to full scale, well inside the ANSI and IEC limit lines.

Accuracy and time reference

Repeatable across the whole range

The charts compare the error of the meter with the limit lines of ANSI C12.20 and IEC 62053-22 for the class 2 and class 20 measuring ranges at unity power factor. The two sensing stages keep the error flat where single-stage meters lose accuracy, that is, at the low end of the current range where most of the operating hours are spent.

Precision time reference

• Internal crystal accurate to 20 ppm at 23 °C when no other synchronisation is enabled.
• Line frequency synchronisation.
• DNP3 time synchronisation.
• IRIG-B time synchronisation.
• SNTP time synchronisation.

Wideband measurement

Nominal frequency range is (42.5 to 69.5) Hz, and the meter also supports wideband measurement from 20 to 500 Hz for variable frequency applications; some functions are disabled in wideband mode.

Power quality measurements certified by a third party to the most demanding international standards.

Power quality analysis

IEC 61000-4-30 class A edition 3

Voltage anomalies, harmonics, flicker, unbalance and many other indices are measured to the class A specification, which makes the readings comparable between instruments and admissible in contractual disputes. Sag and swell events are recorded with microsecond resolution, including peak and duration.

Harmonics to the 511th order

• Harmonic and interharmonic analysis to IEC 61000-4-7 class A.
• Magnitudes to the 511th order in the log viewer; real-time magnitudes and phase angles to the 127th order.
• Total harmonic distortion, total demand distortion and K factor.

Flicker and reports

• Flicker meter to IEC 61000-4-15 class A, on 230 V / 50 Hz and 120 V / 60 Hz systems.
• Weekly EN 50160 power quality reports calculated by the meter.

• ITIC CBEMA curve and SEMI F47 plots for voltage events.
• Limits on any measured value, combined through a Boolean logic tree, with email on alarm.

Waveforms at up to 1024 samples per cycle, an internal database that logs by itself and a web dashboard served by the meter.

Recording, logging and web dashboard

Waveform recording

Surges, sags and transients are captured at up to 1024 samples per cycle with 16-bit conversion, on voltage and current, with preand post-event analysis and fault capture to eight times full scale. Hardware and software triggers can both start a record, and waveforms can be viewed in the software, in the meter web browser or exported to third-party tools.

Logging without configuration

• Internal database log that automatically records 172 metering parameters.
• Eight configurable historical trending logs of 64 channels each.
• Power quality log, limit and alarm log for up to 32 programmable limits, and input status change log.
• Up to 4 GB of memory with up to 1.2 GB reserved for logging and user storage; all logs are first-in first-out.

Security and web dashboard

• Passwords of 32 complex characters with 128-bit AES encryption and fail timeouts against brute force.
• One administrator and ten configurable users across four roles, with physical sealing switch.
• Firmware verification and authentication on update, and an anti-tampering event log.
• HTML5 dashboard with real-time readings, trends, waveforms, phasors and flicker, also on tablets and phones.

Frequency accuracy is given for 50/60 Hz measurement; the meter also supports wideband accuracy for (20-500) Hz applications. Watt-hour accuracy applies from (0.025 to 20) A at unity power factor.

Memory logging capacity

Days are calculated for a 15-minute logging interval; all logs use a first-in first-out buffer and roll over when full.

V1 provides 512 MB of logging memory and 512 samples per cycle; V2 provides 1200 MB and 1024 samples per cycle.

Communication, inputs, outputs and displays

Ordering information

Every field must be filled in to form a valid part number, in the order shown.

Accessories, software and converters

Example of a valid part number: Nexus 1450-D2-60-V1.

The mounting bracket must be ordered with any external input or output module.