Meter Selection

sesa282957 · ‎2015-09-18

Dear Expert,

Please, i need a meter based on the below specification, kindly select the most appropriate meter.

The following are the minimum technical specifications for the programmable electronic grid energy meters for installation at the Nigerian Electricity Grid/Trading Points-

POWER SUPPLY:

Voltage: - 3x 11000/110V ,33000/110V, 132000/110 and 330000/110V.

Current: - 3 X -/1A 3 X -/1A, 3 X-/5A

Frequency: – 50Hz

System: - 3-Phase 3 wire (or 3-Phase 4 wire for 11,) 33, 132 and 330KV

Secondary voltage variation: 85V—135V

Supply frequency variation +5%

Internal Battery: - Lithium CR20255 –1HF or an equivalent giving a total

Stand-by life of 10 years (minimum)

Auxiliary Battery: - Embedded in the meter for down-loading stored

data during power outage

ACCURACY CLASS

0.2 for 132, 330kv voltage levels and for loads above 50MVA.
0.5 for 11 and 33kv voltage levels.
1.0/2.0 LV, Ring CT Operated- for 415V LV voltage level
*MUST BE DLMS/COSEM COMPLIANT - For interoperability with other meter makes, with respect to AMR.

ENVIRONMENTAL CONDITIONS
Operating Temp Range:     -        -15^oc to 60^oc
Storage Temp Range:        -        -15^oc to +70^oc
Humidity: - Annual mean 75% (for 30 days spread over one year, 95%)
BURDEN
Voltage Circuit: -                                 1.12W or 2.45VA
Current Circuit: -                                  /5A Meter 0.12 VA
                                                          /1A Meter 0.02VA

CASING
Material:-   The casing shall be for panel or wall mounting with fire retardant type of Bakelite or Polycarbonate.
Screws: -      All Screws should be stainless steel or nickel – plated brass.
Current Terminals:                               Screw type 2 per terminal (6mm)
                                                         Cable size: 4.0mm².
Voltage Terminals:                                Screw type: 1 per terminal (4mm)
                                                          Cable: 2.5mm².
Auxiliary Terminal:                                Screw type: 3mm
                                                          Cable: 1.5mm².

INSULATION

2.0 KV for 1 minute for current circuit
2.0 KV for 1 minute for voltage circuit
4.0 KV for 1 minute for current, voltage, all relay contacts plus auxiliary inputs plus the RS232/485 ports together.
4.0 KV for 1 minute between all relay contacts and the auxiliary input plus communication port (RS232 or RS485)
4.0 KV for 1 minute between one set of relay contacts and the other relay contacts.

NAME PLATE
The name plate should contain the following:-

Meter serial number
Operating current and voltage
Accuracy class
Frequency
Pulse nominal value etc.

Measured Quantities

Import KWH
Export KWH
Import KVArH
Export KVArH
Apparent KVA maximum Demand
Four Quadrant KVArH
Load Profile (180-450days)
Line parameters e.g. line voltage, current, power factor, active and reactive power, phase angle, frequency and phase rotation.

TARIFFICATION:-                    Time of use register
                                      Maximum demand register
                                      Integration period options: 15 min, 30 minutes etc.
                                      Switching times
                                      Seasons times
                                      Billing dates
                                      End of billing dates etc.
DISPLAY
The display should be capable of displaying Default, Customer and Utility modes.
- Battery backup operated display is required.

EVENTS MONITORING

The meter should be able to monitor the following events among others:-

Battery fail indication
Battery elapse warning
Meter fail Indication
Reverse run warning
Over Current
Phase failure
Current reversal
Voltage reversal
Partial demand
Meter communication event
Time and date of events etc.

DATA STORAGE
It should be capable of storing measured quantities as end-month historical values for up to 16 months.
COMMUNICATION

RS232 and RS485 must be fitted as standard
Optical port: - Opto – electronic, bi-directional
Protocol: - Flag IEC 62056 - 21 (formerly IEC 61107)
Built-in GSM/GPRS Modem with omni-directional antenna
Must be compatible with MV 90 AMR Machine for end-month data retrieval.
SAFETY CLASS

Category - EN61010, EN61011 Class II
REAL TIME CLOCK
Type: - Capable of synchronizing to A.C. Supply or to a crystal
Oscillator
Accuracy: - Better than 0.5 of a second per day at 50^oC
ADDITIONAL INFORMATION

The Energy Meters should be taken to a NERC certified Meter Test Laboratory for Type Test and Accuracy Checks, for a fee.
Enough space should be made available on the Control Panel for Mounting of the meters.

The Programming of the meters to the line CT, VT and display sequence should be carried out at the Meter Manufacturer’s Factory for accurate display of billing parameters.

Anonymous user · ‎2015-09-23

Hello sesa282957,

We have the global meter selector app to help you to select meter based on different conditions and applications

Please find more information below:

https://community.se.com/message/67809#67809