The IEC 60255-181 standard published by the International Electrotechnical Commission (IEC) describes the minimum requirements for the functional and performance evaluation of frequency protection. This standard also contains information on how to document and publish performance test results.
This standard covers functions based on frequency measurement or the rate of change of frequency measurements. It also covers frequency protection in cases where additional blocking elements are used.
This standard defines the factors affecting accuracy under steady-state conditions and performance characteristics during dynamic conditions. Test methodologies to verify performance characteristics are also included in this standard.
The frequency functions covered by this standard are shown in a table as follows:
This functional standard applies to frequency functions embedded in a protection relay, as well as other physical devices that incorporate frequency protection into their functions (e.g., tripping units in a low-voltage circuit breaker or inverters associated with photovoltaic or storage systems). However, it does not cover synchronization or synchronization control functions.
This standard does not specify the functional description of additional features often associated with frequency functions, such as undervoltage inhibition, df/dt control, current control or power control. It only considers the effects on the frequency protection function.
The frequency and frequency change rate measurement outputs provided by the protection devices are not covered by this standard.
Also, this standard does not explicitly cover frequency relays based on current as the amount of input energizing, but the principles covered by this standard can be extended as needed to provide guidance for these applications.
General requirements for measuring relays and protection equipment are contained in the standard IEC 60255-1.
The International Electrotechnical Commission (IEC) continues to work on a set of standards covering the functional requirements of measuring relays and related equipment used to protect electrical transmission and distribution systems. The new protection relay functional standards are set as the IEC 60255-1xx series.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization provides testing services for functional requirements for measurement relays and protection equipment, frequency protection, within the scope of IEC 60255-181 standard, with its trained and expert staff and advanced technological equipment. also gives.
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