Self-calibrating architecture, 0.06 % energy accuracy and IEC 61000-4-30 class A edition 3 measurements
Nexus 1500+
Revenue metering, 50 MHz transients and synchrophasors
Nexus 1500+
Power quality meter with phasor measurement unit
A revenue meter that recalibrates itself every ten seconds and keeps 0.06 % energy accuracy across the range.
Constant calibration
A separate calibration circuit measures the incoming signal every ten seconds, which keeps the metrology stable over time and temperature. Readings exceed the ANSI C12.20 0.1 class and IEC 62053-22 0.2S standards, with an energy class accuracy of 0.06 % and typical shipping accuracy of 0.02 %. Two test pulses on the front allow accuracy to be verified quickly, and the real-time clock drifts less than ten seconds per month.
Advanced revenue metering
- Full four-quadrant metering with virtually unlimited historical trending.
- Transformer and line loss compensation for iron, copper and total substation losses, plus CT/PT compensation.
- Load aggregation through pulse inputs, including gas and water commodities.
- Coincidental readings, such as power factor or reactive power at the time of peak demand.
- Perpetual time-of-use calendar and test mode that does not disturb load profiling or demand recording.
Where it fits
- Substation automation, grid monitoring and distribution reliability measurement.
- Co-generation plants and independent power producers.
- Critical loads where a small error turns into a large cost.
Certified class A power quality measurement, with reports that can be adapted to each jurisdiction.
Power quality analysis
IEC 61000-4-30 class A edition 3
Harmonics, flicker, unbalance, transients, frequency changes, sags, swells and outages are measured to the class A specification, and the meter is classified as a PQI-A device under IEC 62586-2. EN 50160 reports are generated automatically and can be customised to meet local requirements.
Harmonics and flicker
- Harmonic and interharmonic analysis to IEC 61000-4-7 class A, with magnitudes to the 511th order.
- Real-time magnitudes and phase angles resolved to the 127th order; THD, TDD and K factor.
- Flicker meter to IEC 61000-4-15 class A on 220 V / 50 Hz and 120 V / 60 Hz systems.
Event plotting and control
- Independent ITIC/CBEMA log with a summary of surges, sags and average duration, plus SEMI F47 graphing.
- Multi-level programming logic for setpoints: capacitor control, load shedding, automatic transfer schemes and transformer control.
- Alarm notification by email or by internal relay trip.
A 50 MHz transient recorder, 16-bit waveform capture and an on-board phasor measurement unit.
Recording and synchrophasors
Waveform and fault recorder
- Up to 1024 samples per cycle at 16-bit resolution, on voltage and current, with preand post-event analysis.
- Transient capture at over 800 000 samples per cycle, that is, 50 MHz sampling speed, with the V3 and V6 keys.
- Fault recording to eight times full scale, with hardware and software triggers.
- Directional disturbance analysis and harmonic direction analysis.
- Records exported in COMTRADE and PQDIF formats for third-party analysis software.
Phasor measurement unit
- Synchrophasor output to IEEE C37.118.1-2011 and .1a-2014, supporting P and M classes.
- Time synchronisation by IRIG-B or IEEE 1588 PTPv2.
- Individual voltage and current phasors, symmetrical components, frequency and rate of change of frequency.
- Data frame rates of 10, 25 and 50 per second at 50 Hz, and 10 to 60 per second at 60 Hz.
- Data sent to a phasor data concentrator for wide-area situational awareness and islanding detection.
Six simultaneous communication ports, dual Ethernet with separate addresses and encryption that protects the metering data.
Communication, security and I/O
Six ports at the same time
- Two optional RS485 ports with Modbus and DNP3 level 2 plus.
- USB port and ANSI optical port on the front panel.
- Two Ethernet ports with separate MAC and IP addresses; one of them available with fibre optic or RJ45 media.
- Up to 32 Modbus TCP/IP sockets per Ethernet port, DNP3, IEC 61850 with GOOSE messaging, SNMP, SMTP email on alarm, FTP and SNTP or IEEE 1588 PTPv2 time synchronisation.
DNP3 level 2 plus
- Up to 136 measurements mapped to static points: 64 binary inputs, 8 binary counters and 64 analogue inputs.
- Up to 16 relays and 8 resets controlled through DNP3.
- Report by exception with deadbands and unsolicited response, and 250 events across four event types.
Security and inputs and outputs
- Encryption and port control that protect the meter from unauthorised access, with an anti-tampering system events log.
- External modules: analogue outputs, analogue inputs, digital status inputs, relay outputs and pulse outputs.
- Colour touchscreen display with pre-configured screens for readings, alarms and power quality.
| V-Switch key | y technology - featur | res by key | ||||
|---|---|---|---|---|---|---|
| Feature | V1 | V2 | V3 | V4 | V5 | V6 |
| Basic measurement | • | • | • | • | • | • |
| Logging memory | 512 MB | 1 GB | 4 GB | 512 MB | 1 GB | 4 GB |
| Sampling speed | 512 | 1024 | 1024 | 512 | 1024 | 1024 |
| 50 MHz transient recording | • | • | ||||
| IEC 61000-4-30 class A edition 3 | • | • | • | • | • | • |
| IEC 61850 server | • | • | • | • | ||
| IEC 61850 GOOSE | • | • | • | • | ||
| Encryption and access control | • | • | • | |||
| Synchrophasor PMU | • | • | • |
Sampling speed is given in samples per cycle. Transient sampling reaches 800 000 samples per cycle. Keys are activated in the field, so the meter can be upgraded after installation.
Technical specifications
| Voltage input range | (5-347) V AC line to neutral and (10-600) V AC line to line; inputs isolated to 2500 V AC |
|---|---|
| Current input range | Programmable to any CT ratio; class 2 with 1 A nominal secondary and two times overrange, fault recording to ±16 A peak; class 20 with 5 A nominal secondary and four times overrange, fault recording to ±80 A peak |
| Current withstand | 100 A for 10 s, 300 A for 3 s and 500 A for 1 s at 23 °C |
| Burden | Voltage inputs 0.072 VA per phase maximum at 600 V and 0.003 VA at 120 V; current inputs 0.008 VA per phase maximum at 20 A |
| Isolation | All inputs to outputs isolated to 2500 V AC |
| Sensing method | True RMS with up to 1024 programmable samples per cycle, 16-bit conversion with multiple converters, self-calibrating architecture and transients measured at 800 000 samples per cycle |
| Accuracy rating | Energy measurement accuracy of 0.06 %, exceeding ANSI C12.20 0.1 class and IEC 62053-22 0.2S |
| Time clock | 3.5 ppm from (-40 to +85) °C, under ten seconds of drift per month; 2.0 ppm typical from (0 to +40) °C, under six seconds per month |
| Environmental | Operating (-20 to +70) °C; storage (-30 to +80) °C; humidity to 95 % RH non-condensing; protection class IP30 |
| Communication ports | Six simultaneous ports: two optional RS485, front USB, front ANSI optical and two Ethernet, one of them with fibre optic or RJ45 media |
| Displays | Colour touchscreen on the meter, with pre-configured screens for readings, alarms and power quality |
Ordering information
Every field must be filled in to form a valid part number, in the order shown.
| 1. Base meter | Nexus 1500+ meter |
|---|---|
| 2. Control power | 115AC = (100-240) V AC at 50/60 Hz; D2 = (100-240) V DC or (90-264) V AC at 50/60 Hz; D = (18-60) V DC |
| 3. Frequency range | 60 = 60 Hz system; 50 = 50 Hz system |
| 4. Current class | 20 = 5 A nominal CT secondary; 2 = 1 A nominal CT secondary |
| 5. V-Switch pack | V1 standard, 512 MB and 512 samples per cycle; V2 adds 1 GB and IEC 61850; V3 adds 4 GB and 50 MHz transients; V4, V5 and V6 add the synchrophasor unit and the security package to V1, V2 and V3 |
| 6. Communication slot 1 | X = none; 485P = two RS485 ports and four pulse outputs; NTRJ = second RJ45 network card; NTFO = second fibre optic network card, ST terminated |
| 7. I/O slots 2, 3 and 4 | X = none; 6RO1 = six relay outputs; 16DI1 = sixteen status inputs |
| Accessories, software and converters COMPQA6P1Y | Configuration software for Windows, single-computer licence |
| ENERGYPQA-1Year | Energy management solution, one year |
| 1mAON4 / 1mAON8 | Four or eight analogue outputs 0±1 mA |
| 20mAON4 / 20mAON8 | Four or eight analogue outputs 4-20 mA |
| 8AI1 / 8AI2 / 8AI3 / 8AI4 | Eight analogue inputs 0±1 mA, 0±20 mA, 0±5 V DC or 0±10 V DC |
| 8DI1 / 4RO1 / 4PO1 | Eight digital status inputs, four relay outputs or four solid state pulse outputs |
| PSIO / MBIO | Power supply for additional modules and mounting bracket, required with external modules |
| P40N+ / P41N+ / P43N+ / P70N | LED master display, current and power slave displays, and colour touchscreen |
| SMKP70N / E171103 | Mounting kit for the touchscreen and DIN rail mounting kit for the meter |
Accessories, software and converters
Example of a valid part number: Nexus1500+-D2-60-20-V2-485P-NTRJ-6RO1-6RO1.
External input and output modules must be ordered together with their mounting bracket.