Nexus 1500 wave quality analyzer

Self-calibrating revenue meter, 0.06 % energy accuracy

The Nexus 1500+ is a power quality analyser with an on-board phasor measurement unit that recalibrates itself every ten seconds and keeps 0.06 % energy accuracy across the range. Measurements meet the IEC 61000-4-30 class A edition 3 specification, and the meter is classified as a PQI-A device under IEC 62586-2.

Advantages

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 %.

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.
• Perpetual time-of-use calendar and test mode that does not disturb load profiling or demand recording.

50 MHz transient recorder
Waveforms are captured at up to 1024 samples per cycle at 16-bit resolution, on voltage and current, and a transient recorder adds capture at over 800,000 samples per cycle, that is, 50 MHz sampling speed. Records are exported in COMTRADE and PQDIF formats for third-party analysis.

Applications

• 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.
• Synchrophasors for wide-area situational awareness and islanding detection.
• Setpoint control: capacitor banks, load shedding, automatic transfer schemes and transformer control.

About the product

Harmonics, flicker, unbalance, transients, frequency changes, sags, swells and outages are measured to the class A specification, with harmonic and interharmonic analysis to the 511th order and a flicker meter to IEC 61000-4-15 class A. EN 50160 reports are generated automatically and can be customised to meet local requirements, backed by an independent ITIC/CBEMA log and SEMI F47 graphing for voltage events.

The phasor measurement unit outputs synchrophasors to IEEE C37.118.1-2011 and .1a-2014, supporting P and M classes, with time synchronisation by IRIG-B or IEEE 1588 PTPv2 and data frame rates of up to 60 per second. The meter carries six simultaneous communication ports, dual Ethernet with separate addresses, DNP3 level 2 plus, IEC 61850 with GOOSE messaging and a colour touchscreen with pre-configured screens for readings, alarms and power quality.

Technical specifications

Frequently asked questions

What billing accuracy does it offer?
0.06 % energy accuracy, with automatic recalibration every ten seconds and a typical shipping accuracy of 0.02 %.

Can it record fast transients?
Yes, it includes a transient recorder of up to 50 MHz, equivalent to over 800,000 samples per cycle, in addition to waveform recording at 1024 samples per cycle.

What is the phasor measurement unit for?
A module that outputs synchrophasors to IEEE C37.118, with time synchronisation by IRIG-B or IEEE 1588 PTPv2, useful for wide-area monitoring and islanding detection.

Which protocols integrate it into a SCADA system?
DNP3 level 2 plus, Modbus TCP/IP, IEC 61850 with GOOSE messaging, SNMP and SNTP or IEEE 1588 PTPv2 time synchronisation.

Which power quality standards does it meet?
IEC 61000-4-30 class A edition 3, with PQI-A classification under IEC 62586-2, and harmonic analysis to IEC 61000-4-7.