Indoor temperature of relay protection room

The recommended indoor temperature for a relay protection room is typically between 20–25°C with controlled humidity.Recommended Temperature RangeMost relay manufacturers and design standards suggest maintaining a stable temperature between 20°C and 25°C to ensure proper operation of protective relays and prevent electronic drift . This range helps avoid overheating, reduces the risk of relay failure, and ensures accurate fault detection.Humidity and Environmental ControlIn addition to temperature, controlled humidity is essential. For rooms housing electronic controls, relative humidity is generally maintained between 35–50% ±5%, while rooms with only electrical gear should keep humidity below 60% . Proper ventilation, air conditioning, and sealed entryways help maintain these conditions.Design ConsiderationsAir conditioning: Should be sized to handle both sensible and latent heat loads, including heat from relays and other equipment .Ventilation: Natural or forced ventilation may be required to prevent excessive temperature rise inside cabinets .Room layout: Ensure adequate working clearances, maintenance access, and future expansion space .Sealing and insulation: Doors, windows, and cable entries should be sealed to maintain temperature and prevent dust or moisture ingress . Maintaining these environmental conditions is critical for relay longevity, reliability, and accurate system protection. Proper HVAC design and monitoring of temperature and humidity are recommended for all relay protection rooms.