METSyS Total Demand Monitor

METSyS Total Demand MonitorOverviewThe GMC-I PROSyS Substation Total Demand Monitor has been designed to provide an easy to install (30-45 minutes), versatile and configurable metrology system. The total demand of the substation is calculated by the summation of the feeder loads and all loading parameters are measured.

The system may be configured to measure transformer output and feeders by using either Rogowski coils, or 0.333V Wedding ring CT’s, or a combination of the two. This configuration must be specified at the point of order. Busbar voltage phase to phase angles may also be measured for the 3 phases.

Working in conjunction with the Nortech ENVOY GSM/2G/3G RTU, which provides RS485 over Modbus; the data is transmitted to a central iHost server over GPRS using DNP3/NEXUS protocol. This can also be made available to other manufacturer’s host servers if required. Continual logging of metrology values is done via the Modbus interface and all logs are date/time stamped, with the clock being synchronised with central server. Alarms and alerts relating to a range of measured parameters can be sent out.

Key System Features

Modbus Comms

VMEAS

COMPUTED DATA

Tx Rx VMEAS

COMPUTED DATA

Tx RxVMEAS

COMPUTED DATA

Tx RxVMEAS

COMPUTED DATA

Tx Rx

1 2 3 4

5 6

V VVV

• Ease of Installation plug and play interface for both current sensors and voltage inputs.

• Maximum no. of 6 LV feeders per metrology unit.

• Capable of daisy chaining up to 2 metrology units with a single ENVOY via RS485/Modbus. The first unit being the master using only 1 RTU

• Additional inputs for 2 temperature sensors.

• Single substation 3 Phase Voltage plus Neutral measurement point.

• Voltage inputs on 1000V rated cable bundle to a single Amphenol connector - busbar connections means to be provided by Utility.

• 3 Phase + Neutral Current measured using Rogowski coils per feeder - optional Neutral Current Calculation.

• Rogowski coils 600V CAT IV/1000V CAT III Pollution degree 2.

• 0.333V Wedding ring CTs.

• RS485/Modbus.

• DNP3 Protocol.

• GPRS quad band (850, 900, 1800, 1900MHz) and 3G (2100MHz) modem.

• Ethernet enables the system to communicate directly to a standalone system.

• Antenna capable of being relocated from fixed on enclosure to elsewhere to provide improved signal strength.

• LCD on RTU can be used to display Modbus parameters - an aid during commissioning.

• Configurable/programmable alarms for all parameters.

• Voltage data aggregation of Min, Max, Average and RMS values for Voltage over 1 minute average. resolution of 1s to 1Hr.

Reconfigurable to reporting

• Data aggregation of Min, Max, Average and RMS values of all other substation feeder parameters over 10 minute average. Reconfigurable to reporting resolution of 1s to 1Hr.

• Solid state data storage as backup.

• Lockable case with overall dimensions of 425mm x 300mm x180mm.

• Ingress Protection: IP65 (EN60529) and Impact Resistance IK06 (EN62262).

• -1; Safety: EN61010-1 and EN61010-2-032. EMC: EN61326

GPRS / GSM

RTU

V

METSyS Total Demand Monitor

Electrical Characteristics

Current Measurement

Voltage Measurement

Power Supply Unit

Communication Interface Media

Current Range Rogowski Coils or CTs ................................................ : To be defined by customer

CT Full scale output ............................................................................ : 0.333V Accuracy (45-65Hz) ........................................................................... : ± 1% of reading ± 0.1A Linearity (10% to 100% of range) ....................................................... : ± 0.7% of reading Phase Error (45 - 65Hz) ..................................................................... : ± <1° Positional Sensitivity Rogowski Coils .................................................. : ± 2.5% Overload Capacity Rogowski Coils ..................................................... : 75kA

Voltage Range (L - N) ......................................................................... : 400V ACRMS

Accuracy (45-65Hz) ........................................................................... : ± 0.2% of reading ± 0.2V Linearity ............................................................................................. : ± 0.1% of reading Other Measurement Parameters ..................................................... : better than ± 1% ........................................................................................................... : 3 Phase Voltage per phase (V) ........................................................................................................... : 3 Phase Current per phase (A) ........................................................................................................... : Neutral Current (A) ........................................................................................................... : Power per phase (kW) ........................................................................................................... : Power Factor per phase ........................................................................................................... : Apparent Power per phase (kVA) ........................................................................................................... : Frequency (Hz) ........................................................................................................... : Reactive Power per phase (kVAr) ........................................................................................................... : Total demand per feeder ........................................................................................................... : Total substation demand ........................................................................................................... : Temperature sensing 1 Ambient and 1 Patch - optional

Powered from the three phases with respect to Neutral .................. Unit remains energised even with the

loss of 2 voltage phases Consumption ...................................................................................... < 15W

MODBUS Protocol over Serial ............................................................ RS485 3G/GPRS Quad Band Ethernet Communications Protocol ................................................................. DNP3

Safety Standards

EN 61010-1 EN 61010-2-032

1000 VRMS, Category III, 600 VRMS, Category IV, Pollution Degree 2

EMC StandardsEN61326-1

Ingress ProtectionEN60529 IP 65

Impact Resistance EN62262 IK06

General Characteristics Rogowski Coils Material.............................................................................................. : Alcryn, Arnite and Santoprene Conductor Diameter …..... .................................................................. : 50mm / 70mm /100mm Cable Diameter .................................................................................. : 6mm (nominal) Cable Length (Probe to Monitor) ....................................................... : 5 m Operating Temperature Range .......................................................... : -20 to +65°C Storage Temperature Range .............................................................. : -40 to +75°C Operating Humidity ........................................................................... : 15% to 85% (non-condensing) Degree of Protection ......................................................................... : IP50 Probe Colour…………………………………………………… .......................................... : RAL 120 70 75 lemon green ROHS and WEEE Compliant Enclosure Material.............................................................................................. ABS (Halogen Free) Colour................................................................................................. RAL7035 Gasket ................................................................................................ EPDM Anti-tamper Method .......................................................................... Key lockable case Dimensions ........................................................................................ 425mm x 300mm x 180mm