Meter Selection

[sesa282957]

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

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

1. 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]

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