Division 4.2 Effect of disturbances of long duration
United Kingdom
Table 3
| In the case of electromechanical electricity meters, no critical change values are defined for harmonic contents in the current circuits and for DC and harmonics in the current circuit. | |||
| Critical change values for disturbances of long duration | |||
|---|---|---|---|
| Disturbance | Critical change values in percent for meters of class | ||
| A | B | C | |
| Reversed phase sequence | 1,5 | 1,5 | 0,3 |
| Voltage unbalance (only applicable to polyphase meters) | 4 | 2 | 1 |
| Harmonic contents in the current circuitsf1 | 1 | 0,8 | 0,5 |
| DC and harmonics in the current circuit | 6 | 3 | 1,5 |
| Fast transient bursts | 6 | 4 | 2 |
| Magnetic fields; HF (radiated RF) electromagnetic field; Conducted disturbances introduced by radio-frequency fields; and Oscillatory waves immunity | 3 | 2 | 1 |
Annotations
Footnotes
- f1
-
In the case of electromechanical electricity meters, no critical change values are defined for harmonic contents in the current circuits and for DC and harmonics in the current circuit.