While the phrasing "Is 2026 temperature rise?" is not technically correct, based on the provided information, IS 2026 is a standard that defines and specifies temperature rise limits for electrical equipment, specifically transformers, in relation to cooling conditions. It is not temperature rise itself, but rather a reference document containing requirements related to it.
The standard, particularly IS 2026 (Part 1), sets out important criteria concerning the thermal performance of transformers.
Key Requirements from IS 2026 (Part 1) Regarding Temperature
According to section 2.1 of IS 2026 (Part 1), the standard operating condition for cooling water temperature is specified:
- Normal Cooling Water Temperature: Not above +25°C.
This limit is crucial because the specified temperature-rise limits for the transformer, as defined elsewhere within the standard, are based on this normal cooling water temperature.
Adjusting Temperature Rise Limits
The standard also provides guidance on how to handle situations where the cooling water temperature deviates from the normal limit:
- Excess Cooling Water Temperature: If the cooling water temperature exceeds +25°C, the specified temperature-rise limits for the transformer must be adjusted.
- Adjustment Rule: The specified temperature-rise limits for the transformer shall all be reduced by the same amount as the excess cooling water temperature.
Example Adjustment
Let's illustrate with a simple example based on the rule:
| Condition | Cooling Water Temperature | Excess Temperature (Above +25°C) | Adjustment to Transformer Temperature-Rise Limits |
|---|---|---|---|
| Normal Operation | ≤ +25°C | 0°C | No reduction required |
| Operation with Excess Cooling | +30°C | +5°C | Reduce limits by 5°C |
| Operation with Excess Cooling | +35°C | +10°C | Reduce limits by 10°C |
This adjustment ensures that even under warmer cooling conditions, the total temperature (ambient/cooling medium temperature plus the temperature rise) of the transformer's components does not exceed levels that could cause damage or reduce its lifespan.
In summary, IS 2026 (Part 1) is a standard that dictates specific requirements for transformer temperature rise, particularly linking these limits to the cooling water temperature and providing a clear rule for adjusting the acceptable temperature rise when the cooling water is warmer than the specified normal limit of +25°C.
