IEC 61850 Edition 2.1 of Core Documents Published

The other day IEC TC 57 has published five more parts as Edition 2.1 - it took several years to get there! But finally it was successful.

I would call these Edition 2.1 documents simply the real Edition 2 documents.

First of all, what does Edition 2.1 mean?

The original edition 2 documents needed some corrections and updates. All crucial corrections et cetera have been documented in the Tissue Database (https://iec61850.tissue-db.com/default.mspx). The solutions provided on the Tissue Database have been used as input to the standardization process and led to amendments number 1 of the corresponding parts. These amendments have been commented and balloted officially by the members of TC 57. These amendments 1 are now the official documents that are amending the edition 2 documents (both are valid for the next years).

In order to make the "edition 2.1" more readable and understandable, there are other documents available: The consolidated parts 2.1 ... comprising the "old" stuff, the fixes and the extensions.




Consolidated Version of part 7-2: https://webstore.iec.ch/publication/66525 :



So: This consolidated version consists of the second edition (2010) and its amendment 1 (2020). Therefore, no need to order the amendment in addition to this publication.

Note: The first Tissues for edition 2.1 have already be posted, e.g., for part 7-2 Edition 2.1:



The following Previews for edition 2.1 consolidated versions are available:

Preview IEC 61850-6 Edition 2.1
Preview IEC 61850-7-2 Edition 2.1
Preview IEC 61850-7-3 Edition 2.1
Preview IEC 61850-7-4 Edition 2.1
Preview IEC 61850-8-1 Edition 2.1
Preview IEC 61850-9-2 Edition 2.1

Note: The name spaces (code components) for the edition 2.1 parts will be available soon - I hope:
Click HERE for the list of available name spaces (code components).

IEC 61850 Deadband Reporting and Logging - What Does It Provide?

IEC 61850 Reporting and Logging are very useful services to keep the needed bandwidth for messaging low. It is a bit tricky to understand how it works ... due to the fact that there are two documents that need to be studied to understand the function (IEC 61850-7-2 and IEC 61850-7-3). And: You need to know that some changes in the operation of Reporting and Logging happened from Edition 2 to Edition 2.1 (soon to be published as International Standard).

Deadbanding in IEC 61850 provides a filter mechanism that defines, when an analogue value will be reported by the IED (Server side) to another system (Client side).

Edition 2 of IEC 61850-7-3 defines:

"Deadband. Shall represent a configuration parameter used to calculate all deadbanded attributes (for example mag attribute in the CDC MV). The value shall represent the percentage of difference between max. and min. in units of 0,001 %.
If an integral calculation is used to determine the deadbanded value, the value shall be represented as 0,001 % s.
A db value of 0 shall suppress reporting events on the analog value, so that only changes of the range value will lead to events."

Edition 2.1 of IEC 61850-7-3 will define:

"Deadband is a configuration parameter used to calculate deadbanded value 'mag'. The value of 'db' shall represent the percentage of 'dbRef' in units of 0.001 %. Therefore, 'db' = [0...100000], corresponding to [0 %...100 %], respectively. If an integral calculation is used to determine the deadbanded value, the value of 'db' shall be represented as 0.001 %s.
With a 'db' = 0 the attribute 'mag' follows the instantaneous value.
If 'db' is not present in the model, then the deadband calculation is a local issue."

See Tissue Data Base on deadbanding.

"db" = 0 is a dangerous configuration value!! It is like divide by "0". Any (small) change of "instMag" will issue a report or log entry. I am a little bit confused ... but finally it may help with the following use case: Output of the Schedule "ValMV" that is of CDC "MV". See the following figures for some details:


"db" >= 0 could reduce the number of events (reports/log entries) for analogue values. Usually an analogue value is a measurement or a calculated value.

In case of modeling schedules (FSCH in IEC 61850-90-10 / IEC 61850-7-4 Ed2.1) it is required to report/log a scheduled value - which is similar to a measurement ... but it is a non-continuous value (has "jumps" only) ... OK. CDC MV is used for the Output of a Schedule. What is the impact of the "db" value?!? Be careful!
The following figure discusses the impact of trigger option "data change" and "db"=0 as well as "data update":



Finally: If you need to see (as a client) changes only, then "db"=0 is the right configuration. If you want to receive/log a "confirmation" of any new value at the beginning of a new Schedule Interval (SchdIntv) then "data update" is the right configuration.

You need to understand your needs before you decide how to configure deadbanding.

New Work Items Proposed within IEC TC 57 (IEC 62351-14)

57/1746/NP
Power systems management and associated information exchange - Data and communications security - Part 14: Cyber security event logging (proposed IEC 62351-14)

This part 14 of the IEC 62351 series specifies technical requirements for logging cyber security events: transport, log data and semantics, such as how to send and receive security events securely, reliably, how to forward security events or logs, etc.
The purpose of this standard is to specify the requirements needed by the power industry to meet
their cyber security needs, to comply with cyber security regulations and standards, and to guarantee
interoperability among different vendor products.

Logical Node "GSAL" (Generic security application), IEC 61850-7-4, is recommended to take into account with the already published data objects:

AuthFail       Authorisation failures
AcsCtlFail    SEC Access control failures detected
SvcViol        SEC Service privilege violations
Ina                SEC Inactive associations
NumCntRs   Number of counter resets

Ballot closes 2016-09-30

VHPready Signal MMXU1.TotW.instMag – versus IOA 113

Signals configured in IEC 61850 and configured in IEC 60870-5-104 look quite different.

The following figure shows the same signal (Current electric Power – Aktuell erzeugte elektrische Leistung) in IEC 61850 (left) and IEC 60870-5-104 (right):

The IEC 61850 model exposes the value, quaity and timestamp as well as the semantic (TotalWatt). The total watt of what? Of the “Current electric Power – Aktuell erzeigte elektrische Leistung” as described in the DC (description of the signal).

On the other side we have the information object address (IOA = 113) that carries the same value in IEC 60870-5-104. What does the value 3456 mean? No idea in IEC 60870-5-104. You have to know upfront what 113 means. IEC 61850 stores the meaning in the device (model).

In the above case we see also the IOA=113 in the description (DC) of the IEC 61850 model. It is a text string attached to the DC attribute.

Details of Inverter-based DER Devices Modelled in IEC 61850-90-7

Functions and Information Exchanges for Inverter-based DER Devices are modeled in IEC 61850-90-7. What does this document provide? A lot of useful models for real functions needed (today and in the near future) in power distribution systems with massive renewable power fed into the grid. The main models can be found in a document published the other day (see link below).

You can find many functions described and modeled in IEC 61850-90-7, e.g., frequency-watt mode:

This frequency-watt mode addresses the issue that high frequency often is a sign of too much power in the grid, and vice versa. These extreme deviations from nominal frequency can cause grid instability, particularly if they cause significant amounts of generating equipment to trip off-line.
One method for countering this over-power problem is to reduce power in response to rising frequency (and vice versa if storage is available). Adding hysteresis provides additional flexibility for determining the active power as frequency returns toward nominal.

The IEC 61850-90-7 has been written to meet crucial needs in the power delivery system. This document has to be seen in conjunction with other standards as depicted in the UML diagram below:

 

The electrical measurements like voltage, current and frequency are defined in IEC 61850-7-4 Ed2.

Note that the conversion of almost all models into UML (Enterprise Architect) will be completed soon. The huge model will be used to maintain the models in future. This is a crucial step toward tool based standardization.

Download the models based on IEC 61850-90-7 [pdf, 1.1 MB]

Functional Constraint CO “Control” missing in IEC 61850-7-2 Edition 2

Somebody asked me today: “I did not find the CO Functional Constraint among the Functional Constraint list in IEC61850-7-2{ed2.0}.pdf, section 12.3.3.2 FunctionalConstraint (FC). Please advise what does it represent?”

In IEC 61850-7-2 Ed1, IEC 61850-7-3 Ed1, and IEC 61850-8-1 Ed1 the control model was described partly in 7-2, 7-3 and 8-1. Now we have the complete control model defined in IEC 61850-7-2 Ed2 – without any mapping issue! in IEC 61850-7-3 Ed2 we have defined for controllable data objects (CDCs: SPC, DPC, …) that the service is Control and the payload is as defined in IEC 61850-7-2 Ed2.

CDC: SPC, DPC, INC, ENC, BSC, ISC, APC, BAC adds the control service at the end of the CDCs for controllable data objects:

That is the reason why we have removed the FC=CO from IEC 61850-7-3 Ed2 (and IEC 61850-7-2 Ed2).

The FC=CO is introduced in the mapping in IEC 61850-8-1 Ed2.

From an implementation point of view (in MMS terms) it is more or less the same in Ed1 and Ed2 of the three parts. The description has changed – it is cleaner now … if you know where to find it … I agree it’s a bit confusing …

The Data Objects of CDC for settings like SPG, ING, … are not using the control services to set a value! These CDCs just support SetDataValues (which is a write in MMS …without the control state machines) and other services:

Hope that helps to understand the (mainly editorial) changes in the three parts 7-2 Ed2, 7-3 Ed2, and 8-1 Ed2.

List of almost all IEC 61850 Logical Nodes

A list of some 280 Logical Nodes from the following documents has been posted (see below):

• IEC 61850-7-4 Ed2
• IEC 61850-7-410 Ed1
• IEC 61850-7-420 Ed1
• IEC 61400-25-2 Ed1

Download the list of the 280 Logical Nodes [pdf; 314 KB].

You can see if the LN is new, extended (few, several, many extensions) or more or less unchanged.

You will find a lot of new LNs in IEC 61850-7-4 like the LGOS (GOOSE Subscription). The LN LGOS is defined for the monitoring of GOOSE messages:

Logical Node GOOSE Subscription LGOS:

DataObject	Semantic
NdsCom	Subscription needs commissioning
St	Status of the subscription
SimSt	Status showing that really Sim(ulation) messages are received and accepted
LastStNum	Last state number received
ConfRevNum	Expected configuration revision number Settings
GoCBRef	Reference to the subscribed GOOSE control block

NettedAutomation offers a comprehensive training on the Migration from the various Edition 2 parts of IEC 61850 that have been published so far.

Fix in IEC 61850-7-4 Edition 2 - Mode and Behaviour

Please note that Table A.2 – Definition of mode and behaviour in IEC 61850-7-4 Edition 2 has an error that has been corrected, see Tissue 671:

For incoming data with q.test = True and Mode on, the data shall be processed as invalid!

Access IEC 61850-7-4 Tissue 671.

Wireless Temperature Sensors for Switchgears and IEC 61850

Monitoring the temperature of likely failure points within electric power switchgear provides invaluable data on the health of that piece of equipment. Wireless solutions for temperature monitoring of medium-voltage and high-voltage switchgear are appropriate means to get critical information about the health of switchgears – especially for aging switchgears that have an ever more crucial impact on the reliability of the electric power system.

Ruggedized passive wireless radio-based temperature sensor and monitoring systems are a great answer for medium-voltage and high-voltage electric power switchgear. The access to the these measured temperature values through IEC 61850 is now available by Intellisaw.

Access the Intellisaw website to read the benefits of their Wireless sensors.

Check the temperature measurement model STMP of IEC 61850.

Power Quality Information modeled in IEC 61850

IEC 61850 is a powerful standard – also for describing the exchange of Power Quality Information.

IEC 61850 has been extended to support many advanced power quality applications like those defined in IEC 61000-4-30 and EN 50160. IEC 61850-7-4 Edition 2 defines logical nodes, that support modeling and configuring event sequencing with additional quality reporting and waveform recording.

Excerpt of logical nodes for power quality:

• Harmonics (MHAI)
• Flicker (MFLK)
• Imbalanced power calculations (MADV)
• Frequency variation (QFVR)
• Current transient (QITR)
• Current unbalance variation (QUIB)
• Voltage transient (QVTR)
• Voltage unbalance variation (QVUB) and
• Voltage variation (QVVR).

Click HERE for a nice summary published by Schneider Electric.
Click HERE for a draft list of Logical Nodes for Power Quality (this content was used as input to the development of IEC 61850-5 Edition 2 and IEC 61850-7-4 Edition 2).

Sensors in Smart(er) Grids Not Only For Electrical Measurement

Smart Grid (condition monitoring) Sensors may detect faulting fuses, insulators, conductors, transformers, as well as fires, ice, water level, floods, oil spills & air pollution conditions and and …

Myriads of sensors will be installed in the context of Smart(er) Grids the years to come.

Click HERE for a 10 minute video on various use cases.
Click HERE for a roll-out of sensors in a distribution network. 
Click HERE on a discussion “How many protocol interfaces can we afford?"
Click HERE for a project where IEC 61850 is used for exchanging sensor data.

With IEC 61850 – one ne or the other – it is possible to let all sensors speak a SINGLE LANGUAGE. Intelligent sensors may speak IEC 61850 integrated in the sensor itself, or the sensors may communicate to an aggregation device (like an RTU) that provides IEC 61850 connectivity to the next level of monitoring and so on.

Click HERE for the IEC 61850-7-4 Ed2 Logical Node STMP (Temperature Supervision).

NIST SGIP - Special Cross-PAP Session on Coordinated Information Modeling for Generators and Storage

The fall face-to-face meeting of the NIST SGIP (Smart Grid Interoperability Panel) will take place in St. Louis (MS) from September 14-16, 2010.

A Special Cross-PAP Session on Coordinated Information Modeling for Generators and Storage is intended to provide overviews of and to initiate coordination of activities required to develop consistent information models for different generator/storage types across different Smart Grid domains. This Cross-PAP issues session is your chance to participate in discussions on coordinating consistent information models and information exchange requirements for different generator types (e.g., wind turbines [IEC 61400-25-2], hydro power plants [IEC 61850-7-410], PV systems, and storage [IEC 61850-7-420], ...) across multiple domains (consumer, distribution, and transmission).
Session is scheduled for Wednesday, Sept. 15^th (12:30-15:00)

Click HERE for the full program and other details of the meeting.

Please note that Mr. Karlheinz Schwarz (member of PAP16, editor IEC 61850, IEC 61400-25) will be in St. Louis on Sept. 15 and 16 ... to meet you ...

Edition 2 of IEC 61850-7-4 has been published

The second edition of IEC 61850-7-4 has been published as international standard:

Communication networks and systems for power utility automation –
Part 7-4: Basic communication structure – Compatible logical node classes and data object classes

Click HERE to download the preview of part 7-4.

A list of all currently published Logical Nodes and Data Objects can be found HERE.

What is Edition 1 and Edition 2 of IEC 61850?

The first 14 parts of the standard SERIES IEC 61850 have been published between 2001 and 2004. These standards are often understood as IEC 61850 EDITION 1. Each of these parts and also the two parts IEC 61850-7-410 (Hydro Power) and IEC 61850-7-420 (DER) have been published tagged as EDITION 1. Example:

Click HERE for preview of Part 7-420 EDITION 1: Basic communication structure – Distributed energy resources logical nodes

Several of these 16 published standards are now under revision (IEC calls this process maintenance). The revised document - once published - will be tagged EDITION 2, e.g., the EDITION 2 of part IEC 61850-6 has been published recently:

Click HERE for the Preview of the standard IEC 61850-6 EDITION 2.

Additional parts, e.g., IEC 61850-7-4 or -7-3 are in the maintenance process and will be published in their EDITION 2 very soon.

BUT there will be not an EDITION 2 of the standard SERIES IEC 61850 per se!! Various parts (of the first 16 parts) will be revised and extended and then published tagged as EDITION 2.

New parts will be published with the tag EDITION 1, e.g., IEC 61850-80-1 (Guideline to exchanging information from a CDC-based data model using IEC 60870-5-101 or IEC 60870-5-104) - IEC/TS 61850-80-1, Edition 1.0, 2008-12.

Click HERE for a preview of IEC 61850-80-1 EDITION 1.

All parts published after the first 14 parts that had been published by 2004 have either the tag Edition 2 or Edition 1 !!

If you are waiting for "Edition 2" what do you mean? I guess you mean the following:

• EDITION 2 of parts IEC 61850-6, -7-4, -7-3, -7-2, -7-1, -8-1, 9-2, 7-410, 7-420, etc. and
• EDITION 1 of the parts IEC 61850-80-1, 61850-90-1, -90-2, -90-3, -90-4, etc.

Click HERE to download a table of all parts of Edition 1 and Edition 2 (updated 2010-02-01).

It is highly recommended to name the specific part when we talk about EDITION 2! Example: IEC 61850-6 EDITION 2.

Hope that helps!

IEC 61850-7-4 approved as International Standard

The FDIS on IEC 61850-7-4 Edition 2 has been approved as International Standard (100 % approval)!

Click HERE for the voting result.