Metering

Three phase direct, CT and CT/VT electricity meters.

Three phase electricity meters to IEC 62052 and 62053, direct connected, CT connected or CT/VT connected, with class 1.0, 0.5S and 0.2S accuracy and high accuracy transformer operated meters for grid points. Open DLMS/COSEM communications work with plug in power line, Wi-SUN RF mesh, LoRaWAN and cellular modules, including NB-IoT and LTE-M. These are among the highest quality meters available, premium built for harsh environments and very long service lives.

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A three phase prepaid meter with keypad beside a three phase postpaid meter

Connection: Direct, CT and CT/VT
Direct connected current: Up to 100 A
Accuracy class: 0.1S to 1.0
Protocol: DLMS/COSEM

The range

Prepaid, postpaid and smart three phase meters, direct connected, CT connected and CT/VT connected, plus high accuracy transformer operated meters. They are DLMS/COSEM meters that take a plug in communication module, so one meter platform can run on power line, Wi-SUN RF mesh, LoRaWAN or cellular networks, including NB-IoT and LTE-M, and change later. For single phase meters, see our single phase range.

Customised designs available. If your project needs ratings, features, design requirements or arrangements outside the standard range below, we design and manufacture to your requirements and application.

A three phase postpaid electricity meter with display, terminal cover and optical port

Three Phase Meters

One three phase meter platform for prepaid, postpaid and smart metering, in the same way as the single phase range. It is built as direct connected, CT connected or CT/VT connected meters, for homes, commercial sites and large industrial customers. Prepaid with STS 6 tokens, postpaid, or smart with communications built in. Prepaid and postpaid meters can be supplied without communications and have plug in G3-PLC, BPLC, Wi-SUN, LoRaWAN or cellular modules, including NB-IoT and LTE-M, fitted at installation or added later. Accuracy is class 1.0, with class 0.5S and 0.2S available, and a polyphase keypad version adds power quality measurement to the 50th harmonic.

Operating modesThree Phase Meters

Prepaid	STS6 compliant. Pay in advance, with credit loaded by token or remotely
Postpaid	Conventional billing, no communications. Communications can be added later
Smart	Prepaid or postpaid with communications built in

Technical dataThree Phase Meters

Connection	Direct connected, CT connected or CT/VT connected
Reference voltage	3 x 230/400 V or 3 x 240/415 V
Current	Direct connected: 5 (100) A CT and CT/VT connected: to suit the instrument transformers
Accuracy	Class 1.0 kWh; class 2.0 kvarh Optional: Class 0.5S or 0.2S kWh
Frequency	50 Hz, ±5% Optional: 50 or 60 Hz, ±2%
Measurement	Four quadrant, three phase
Operating voltage range	70% to 130% of reference voltage
Impulse voltage withstand	Rated 6 kV impulse and 6 kV lightning surge Tested beyond the IEC 62052-11 requirement
AC voltage withstand	4 kV
Fast transient burst immunity	4 kV
Electrostatic discharge	Contact 8 kV, air 15 kV
Tariffs	Up to 8 tariffs, 6 seasons, 100 special days
Token entry	Remote credit transfer Optional: 20 digit STS 6 tokens by keypad
Load switch	None Optional: Bi-stable relay, to 100 A (direct connected only)
Communications	Plug in module, fitted at installation or retrofitted later Optional: Embedded G3-PLC (smart version)
WAN communications	Plug in module Optional: G3-PLC, BPLC, Wi-SUN RF mesh, LoRaWAN, GPRS, 3G, 4G, NB-IoT, LTE-M
Event logging	Tamper, failure and power quality events
Data security	DLMS/COSEM with low level and high level security Optional: Security Suite 1
Power quality	Under and over voltage (sag and swell), current imbalance and over current events logged Optional: Harmonic measurement to the 50th (polyphase keypad version)
Standards	IEC 62052-11; IEC 62053-21 and 62053-23; EN 50470-1 and 50470-3 (European MID); IEC 62055-31 for prepaid
Certification	SGS certified; MID certified to EN 50470 with KEMA certification; type tested to IEC and European standards
Firmware upgrade	Local interface and over the air
Protection	IP54; Class II insulation
Operating temperature	−25°C to +55°C Optional: −40°C to +70°C limit range
Humidity	Up to 95%, non-condensing
Design life	15 years or more

A three phase transformer operated smart energy meter with display, buttons and terminal block

Transformer Operated Meters

High accuracy three phase meters for transformer connected metering at regional grid points, power station gateways and large industrial sites. Class 0.1S or 0.2S active energy, with harmonic and power quality measurement, waveform recording and communications over RS485, RS232, Ethernet and 4G.

Technical dataTransformer Operated Meters

Voltage	3 x 57.7/100 V to 3 x 277/480 V
Current	1 (2) A, 5 (10) A or 1 (10) A
Accuracy	Class 0.1S or 0.2S active; class 0.5S or 2 reactive
Frequency	50 or 60 Hz, ±5%
Certification	SGS certified; type tested to IEC and European standards
Tariffs	Up to 8 tariffs
Load profile	15 minute interval, one year of storage; 24 months of billing data
Power quality	Harmonics, interharmonics, voltage and current unbalance, flicker, waveform recording
Communications	RS485, RS232, Ethernet, optical, 4G
Protocols	DLMS/COSEM, Modbus, IEC 61850
Protection and temperature	IP54; −40°C to +70°C
Design life	16 years or more
Firmware upgrade	Local interface and over the air
Event logging	Fraud, failure, power quality and security events
Humidity	Up to 95%, non-condensing

Design and performance

Three phase meters for homes, commercial sites, large industrial customers and grid points, in direct connected, CT connected and CT/VT connected versions.

Prepaid or Postpaid in One Meter

Prepayment and postpayment modes can be switched in the field, so one meter serves both customer types and a customer can change over without a replacement.

STS 6 Token Prepayment

Optional 20 digit STS 6 tokens are entered by keypad or sent remotely to transfer credit and parameters, with three levels of low credit alarm, emergency credit and friendly time and days.

Plug In Communication Modules

WAN modules plug into a separate module box, so power line, Wi-SUN RF mesh, LoRaWAN and cellular options, including NB-IoT and LTE-M, are fitted or swapped without a new meter. Local HAN options include RS485, M-Bus, RF and an in-home display.

Open DLMS/COSEM Protocol

Meters speak DLMS/COSEM with password and encrypted authentication, so they work with standards based head-end systems. The DLMS implementation has been conformance tested by the DLMS User Association.

Tamper and Fraud Detection

Meter cover and terminal cover opening, current reversal and strong magnetic fields are detected and logged, with power quality, failure and security events recorded alongside.

Remote Load Control

On direct connected meters, an optional internal bi-stable relay supports remote disconnect and reconnect, over current and power limit control, and automatic disconnection on tamper or no credit.

Local Reading and Setup

An optical port to IEC 62056-21, plus Bluetooth or RF handheld reading, lets crews read, set parameters and update firmware on site with an Android app.

Direct, CT and CT/VT Connection

Direct connected meters suit loads up to 100 A. Above that, CT connected meters read the current through current transformers while taking voltage straight from the supply, and CT/VT connected meters also use voltage transformers, for medium and high voltage metering. The same meter platform covers all three.

Accuracy and Power Quality

Class 1.0 as standard, with class 0.5S and 0.2S available, and class 0.1S and 0.2S for grid point meters. Power quality events are logged, and a polyphase keypad version measures harmonics to the 50th.

Performance Beyond the Standard

Our three phase meters are tested beyond the IEC requirements. They are designed and tested to IEC and European (EN 50470, MID) standards, MID certified with KEMA certification, and built for the overvoltage and surge conditions of utility networks.

Premium Quality, Built for the Long Term

These are amongst the highest quality meters available, premium built for harsh environments and engineered for very long service lives. Class II insulation, IP54 protection and a design life of 15 years or more, with replaceable backup batteries and firmware that is upgraded over the air, keep meters accurate and in service year after year.

Applications

Delstar supplies three phase meters for:

Commercial and Small Industrial

Three phase smart meters with load profiles, tariffs and power quality events.

Large Commercial and Industrial Metering

CT and CT/VT connected meters for customers above direct connection limits, with load profiles, tariffs and power quality events.

Pacific and Remote Networks

Prepaid and RF or cellular meters for island and remote utilities where site visits are costly.

Network Boundary and Generator Billing

Class 0.1S and 0.2S transformer operated meters for regional grid points and power station gateways.

Sourcing and quality assurance

Our three phase meters come from an established metering manufacturer that designs its own meters, communication modules and head-end software, and builds them on automated production lines with in-line testing. Meter designs are type tested and certified by SGS to IEC and European (EN 50470, MID) standards, and the DLMS/COSEM implementation is conformance tested by the DLMS User Association. Delstar checks each order against your specification and delivers to site across New Zealand, Australia and the Pacific.

Lifecycle support

Specification and selection: we help match the meter type, communications module and prepayment option to your network, tariff structure and metering provider requirements.
Spares and asset management: spare meters, communication modules and ongoing support through our asset management service.

Talk to our team

Specify your metering requirement.

Tell us the connection type (direct, CT or CT/VT), voltage and current rating, accuracy class, whether you need prepaid or postpaid operation, your communications network, and your head-end or vending system. We will recommend the right meter.