EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 60255-127 test. IEC EN 60255-127 specifies minimum requirements for over/under voltage relays. The standard includes features of the protection function, measurement features and time delay features.
This standard defines the factors that affect accuracy under steady-state conditions and performance characteristics during dynamic conditions. Test methodologies for verifying performance characteristics and accuracy are also included in this standard.
If any binary input signals (externally or internally driven) are used, their effect on the protection function must be clearly defined in the functional logic diagram. Additional textual description may also be provided if it could further clarify the functionality and intended uses of the input signals.
The relationship between operating time and characteristic quantity can be expressed by means of a characteristic curve. The shape of this curve should be declared by the manufacturer by an equation (preferred) or graphical means. The time characteristic defines the operating time, which is the time between when the input energy amount exceeds the set value and when the relay operates.
Relay reset characteristics must be defined by the manufacturer to allow users to determine the behavior of the relay on repeated intermittent faults or faults that may occur in rapid succession. 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.
EUROLAB assists manufacturers with IEC EN 60255-127 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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