EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 60255-149 testing. IEC EN 60255-149 specifies the minimum requirements for thermal protection relays. This standard includes protection function specifications, measurement specifications and test methodologies. The aim is to establish a common and repeatable reference for evaluating dependent time relays that protect equipment from thermal damage by measuring ac current flowing through the equipment. For the thermal protection specification specified in this standard, supplemental input energizing quantities such as ambient, coolant, top oil and winding temperature can be applied. This standard covers protection relays based on a thermal model with memory function.
This reset feature applies to overvoltage and undervoltage protection. A fixed time reset for an overvoltage protection is described here. The principle is the same for undervoltage protection. This standard does not cover the thermal overload protection trip classes specified in IEC EN 60947-4-1 and IEC EN 60947-4-2 for electromechanical and electronic protection devices for low voltage motor starters.
Input energy quantities are measurement signals such as phase (or line) currents and ambient/ambient or winding temperatures (if required or applicable). Their values and related requirements are specified in IEC EN 60255-1.
Input energizing quantities can be presented as a data packet from current transformers and any additional input quantities such as ambient or winding temperature to the thermal protection functional logic physically connected or over a communication ports using an appropriate data communication protocol such as IEC EN 61850-9-2.
The input energy amounts used by the thermal protection function need not be the current directly taken by the secondary of the current transformers. Therefore, the protection relay documentation should specify the type of energizing quantities used by the thermal protection function.
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