Appendix ANNEX P LINE VOLTAGE
United Kingdom
The characteristics of the main traction voltage systems (with the exception of over-voltages) are described in detail in the following table:
Nominal voltages and their acceptable limits in value and in duration.
| The duration of voltages between U min1 and U min2 shall not exceed two minutes. | |||||
| The duration of voltages between U max1 and U max2 shall not exceed five minutes. | |||||
| Electrification system | Lowest non-permanent voltage | Lowest permanent voltage | Nominal voltage | Highest permanent voltage | Highest non-permanent voltage |
|---|---|---|---|---|---|
| U min2(V) | U min1(V) | U n(V) | U max1(V) | U max2(V) | |
| DC (mean values) | 400f1 | 400 | 600 | 720 | 800f2 |
| 400 | 500 | 750 | 900 | 1 000 | |
| 1 000 | 1 000 | 1 500 | 1 800 | 1 950 | |
| 2 000 | 2 000 | 3 000 | 3 600 | 3 900 | |
| AC (effective values) | 11 000 | 12 000 | 15 000 | 17 250 | 18 000 |
| 17 500 | 19 000 | 25 000 | 27 500 | 29 000 | |
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The voltage of the collection bar in the substation including the line circuit breakers shall not exceed U max1,
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voltages, in normal operating conditions, have to stay in the range between U min1 and U max2,
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when operating conditions are interrupted, voltages in the range U min1 to U min2 are acceptable.
Relationship U max1/U max2
Every occurrence of U max2 must be followed by a level not exceeding U max1 for an indefinite duration.
Lowest tension of service
When the operating conditions are interrupted, U max2 will be the lower voltage limit for the air breakers when trainsets can run.
Note:
Values recommended for under-voltage tripping.
The under-voltage breakers with fixed or adjustable trips can be adjusted for values between 85 % and 95 % of U min2.
Annotations
Footnotes
- f1
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The duration of voltages between U min1 and U min2 shall not exceed two minutes.
- f2
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The duration of voltages between U max1 and U max2 shall not exceed five minutes.