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Division 2 Rated operating conditions

United Kingdom

Original text. Later amendments are not shown.

The manufacturer shall specify the rated operating conditions of the meter; in particular:

The values of fn, Un, In, Ist, Imin, Itr and Imax that apply to the meter. For the current values specified, the meter shall satisfy the conditions given in Table 1;

Table 1

For Class B electromechanical meters I min ≤ 0,4 × I tr shall apply.

Class AClass BClass C
For direct-connected meters
Ist ≤ 0,05 × I tr ≤ 0,04 × I tr ≤ 0,04 × I tr
Imin ≤ 0,5 × I tr ≤ 0,5 × I tr ≤ 0,3 × I tr
Imax ≥ 50 × I tr ≥ 50 × I tr ≥ 50 × I tr
For transformer-operated meters
Ist ≤ 0,06 × I tr ≤ 0,04 × I tr ≤ 0,02 × I tr
Imin ≤ 0,4 × I tr ≤ 0,2 × I tr f1 ≤ 0,2 × I tr
In = 20 × I tr = 20 × I tr = 20 × I tr
Imax ≥ 1,2 × I n ≥ 1,2 × I n ≥ 1,2 × I n

The voltage, frequency and power factor ranges within which the meter shall satisfy the MPE requirements are specified in Table 2. These ranges shall recognise the typical characteristics of electricity supplied by public distribution systems.

The voltage and frequency ranges shall be at least:

  • 0,9 × U n ≤ U ≤ 1,1 × U n
  • 0,98 × f n ≤ f ≤ 1,02 × f n

power factor range at least from cosφ = 0,5 inductive to cosφ = 0,8 capacitive.

Annotations

Footnotes

f1

For Class B electromechanical meters I min ≤ 0,4 × I tr shall apply.