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NEK IEC TS 60255-216-1:2025

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Abstract

This document covers protection functions with digital inputs and outputs complying with urn:iec:std:iec:61850::ser::IEC 61850 series and urn:iec:std:iec:61869::ser::IEC 61869 series, in particular regardingsubscription to sampled values (SV) streams representing energising inputs instead of analog inputs (see Figure 1);subscription to GOOSE (e.g. circuit breaker position, circuit breaker failure);publication of GOOSE messages (e.g. trip signals);subscription to time synchronisation messages.On this basis, this document formulates requirements for protection functions with digital inputs and outputs and for the IED hosting them. The document also covers tests related to the functional interoperability and functional requirements of these protection functions, in addition to the general conformance tests required by urn:iec:std:iec:61850-10:2012-12:::IEC 61850-10:2012 and test related requirements in urn:iec:std:iec:61850-10-3:2022-02:tr::IEC TR 61850-10-3:2022[1]11Numbers in square brackets refer to the Bibliography..Numbers in square brackets refer to the Bibliography.Requirements regarding characteristics of the communication network are not within the scope of this document. Delays and jitter due to the network are taken into account by network engineering. The expected behaviour of protection functions in case of delays, jitter or loss of SV is covered by this document. Figure 1 below shows the functional chain of a protection function, where each IED is connected to the PACS communication network. This document only considers the data received and published by the protection function as shown in Figure 1. It describes the coordination between the digitally interfaced protection functions and the characteristics of the analog acquisition chain.See the list of abbreviations in Clause 4.urn:iec:std:iec:61869-12::::IEC 61869-12 is under development.If not mentioned otherwise, the term “switch” in this document refers to the switches used in the communication network.The PACS communication network engineering and cyber security measures to be applied on PACS level are out of scope of this document.Requirements for protection functions switching over between two redundant SV streams acquired by different acquisition chains but reflecting the same primary values are covered in this document.This document is applicable to protection functions for AC networks implemented in IEDs subscribing SV streams. Parts of the considerations can also apply to IEDs combining analog inputs connected to Instrument Transformers and SV subscription.If an IED hosting protection functions is interfacing analog inputs connected to Instrument Transformers and publishes the associated SV streams, it is a multifunctional IED and complies additionally with the relevant urn:iec:std:iec:61869::::IEC 61869 standards. This type of device is out of scope of this document.Some aspects related to cyber security are considered in this document, e.g. reception of duplicated or corrupted messages. The implementation of specific cyber security standards, such as urn:iec:std:iec:62351-6::::IEC 62351-6[2] is covered by the general implementation requirements of the urn:iec:std:iec:61850::ser::IEC 61850 series. Detailed cyber security requirements for IEDs hosting protection functions are out of scope of this document.

Document information

  • Standard from NEK
  • Published:
  • Edition: 1.0
  • Version: 1
  • Document type: TS
  • ICS 29.120.70
  • National Committee NEK/NK94/95

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  • Adopted from: IEC TS 60255-216-1:2025