SIST EN 61400-25-6:2011
Wind turbines - Part 25-6: Communications for monitoring and control of wind power plants - Logical node classes and data classes for condition monitoring (IEC 61400-25-6:2010)
Wind turbines - Part 25-6: Communications for monitoring and control of wind power plants - Logical node classes and data classes for condition monitoring (IEC 61400-25-6:2010)
This part of the IEC 61400-25 series specifies the information models related to condition monitoring for wind power plants and the information exchange of data values related to these models. Figure 2 illustrates the information flow of a system using condition monitoring to perform condition based maintenance. The figure illustrates how data values are refined and concentrated through the information flow, ending up with the ultimate goal of condition based maintenance - actions to be performed via issuing work orders to maintenance teams in order to prevent the wind power plant device to stop providing its intended service. Condition monitoring is mainly based on the following kinds of information. - Time waveform records (samples) of a specific time interval to be exchanged in realtime or by files for analysis (e.g. acceleration, position detection, speed, stress detection). - Status information and measurements (synchronized with the waveform records) representing the turbine operation conditions. - Results of time waveform record analysis of vibration data (scalar values, array values, statistical values, historical (statistical) values, counters and status information). - Results of, for example, oil debris analysis. It is the purpose of this standard to model condition monitoring information by using the information modelling approach as described in 6.2.2 of IEC 61400-25-1 and by extending the existing information model as specified in Clause 6 of IEC 61400-25-2, the information exchange models specified in Clause 9 of IEC 61400-25-3 and the mapping to communication profiles as specified in IEC 61400-25-4.
Windenergieanlagen - Teil 25-6: Kommunikation für die Überwachung und Steuerung von Windenergieanlagen - Klassen logischer Knoten und Datenklassen für die Zustandsüberwachung (IEC 61400-25-6:2010)
Eoliennes - Partie 25-6: Communications pour la surveillance et la commande des centrales éoliennes - Classes de noeuds logiques et classes de données pour la surveillance d'état (CEI 61400-25-6:2010)
Sistemi generatorjev vetrne turbine - 25-6. del: Komunikacije za spremljanje in nadzor vetrnih elektrarn - Razredi logičnih vozlišč in razredi podatkov za nadzor pogojev (IEC 61400-25-6:2010)
Ta del serij IEC 61400-25 določa informacijske modele, povezane z nadzorom pogojev za vetrne elektrarne in izmenjavo informacij podatkovnih vrednosti, povezanih s temi modeli. Slika 2 prikazuje pretok informacij sistema z uporabo nadzora pogojev za opravljanje vzdrževanja na podlagi pogojev. Slika prikazuje, kako podatkovne vrednosti, ki so prečiščene in koncentrirane skozi pretok informacij, končajo kot končni cilj vzdrževanja na podlagi pogojev – dejanja, ki so izvedena prek izdajanja delovnih nalogov vzdrževalnim ekipam, zato, da se prepreči vetrni elektrarni prekiniti dobavo predvidene storitve. Spremljanje pogojev predvsem temelji na naslednjih vrstah informacij: – zapisi časovnih valovnih oblik (vzorci) določenega časovnega intervala za izmenjavo v realnem času ali kot datoteke za analize (npr. pospešek, zaznava postavitve, hitrost, zaznava obremenitve), – informacije o statusu in meritve (sinhronizirane z zapisi valovnih oblik), ki predstavljajo pogoje delovanja turbin, – rezultati analiz zapisov valovnih oblik podatkov o vibracijah (skalarne vrednosti, vrednosti polj, statistične vrednosti, zgodovinske (statistične) vrednosti, števci in informacije o statusu). - rezultati, na primer, analiz smeti v olju. Namen tega standarda je modeliranje informacij nadzora pogojev z uporabo pristopa informacijskega modeliranja, kot je opisano v točki 6.2.2 IEC 61400-25-1, in z razširjanjem obstoječega informacijskega modela, kot je določeno v klavzuli 6 IEC 61400-25-2, modelov za izmenjavo informacij, določenimi v klavzuli 9 IEC 61400-25-3, in preslikave na komunikacijske profile, kot je določeno v IEC 61400-25-4.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Windenergieanlagen - Teil 25-6: Kommunikation für die Überwachung und Steuerung von Windenergieanlagen - Klassen logischer Knoten und Datenklassen für die Zustandsüberwachung (IEC 61400-25-6:2010)Eoliennes - Partie 25-6: Communications pour la surveillance et la commande des centrales éoliennes - Classes de noeuds logiques et classes de données pour la surveillance d'état (CEI 61400-25-6:2010)Wind turbines - Part 25-6: Communications for monitoring and control of wind power plants - Logical node classes and data classes for condition monitoring (IEC 61400-25-6:2010)35.240.50Uporabniške rešitve IT v industrijiIT applications in industry27.180Sistemi turbin na veter in drugi alternativni viri energijeWind turbine systems and other alternative sources of energyICS:Ta slovenski standard je istoveten z:EN 61400-25-6:2011SIST EN 61400-25-6:2011en01-april-2011SIST EN 61400-25-6:2011SLOVENSKI
STANDARD
SIST EN 61400-25-6:2011
EUROPEAN STANDARD EN 61400-25-6 NORME EUROPÉENNE
EUROPÄISCHE NORM January 2011
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61400-25-6:2011 E
ICS 27.180
English version
Wind turbines -
Part 25-6: Communications for monitoring and control of wind power plants -
Logical node classes and data classes for condition monitoring (IEC 61400-25-6:2010)
Eoliennes -
Partie 25-6: Communications pour la surveillance et la commande des centrales éoliennes -
Classes de noeuds logiques et classes de données pour la surveillance d'état (CEI 61400-25-6:2010)
Windenergieanlagen -
Teil 25-6: Kommunikation für die Überwachung und Steuerung von Windenergieanlagen -
Klassen logischer Knoten und Datenklassen für die Zustandsüberwachung (IEC 61400-25-6:2010)
This European Standard was approved by CENELEC on 2011-01-03. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 61400-25-6:2011
EN 61400-25-6:2011 - 2 - Foreword The text of document 88/377A/FDIS, future edition 1 of IEC 61400-25-6, prepared by IEC TC 88, Wind turbines, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61400-25-6 on 2011-01-03. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: – latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop)
2011-10-03 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2014-01-03 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 61400-25-6:2010 was approved by CENELEC as a European Standard without any modification. __________ SIST EN 61400-25-6:2011
- 3 - EN 61400-25-6:2011 Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 61400-25-1 2006 Wind turbines -
Part 25-1: Communications for monitoring and control of wind power plants - Overall description of principles and models EN 61400-25-1 2007
IEC 61400-25-2 2006 Wind turbines -
Part 25-2: Communications for monitoring and control of wind power plants - Information models EN 61400-25-2 2007
IEC 61400-25-3 2006 Wind turbines -
Part 25-3: Communications for monitoring and control of wind power plants - Information exchange models EN 61400-25-3 2007
IEC 61400-25-4 - Wind turbines -
Part 25-4: Communications for monitoring and control of wind power plants - Mapping to communication profile EN 61400-25-4 -
IEC 61400-25-5 - Wind turbines -
Part 25-5: Communications for monitoring and control of wind power plants - Conformance testing EN 61400-25-5 -
IEC 61850-7-2 2003 Communication networks and systems in substations -
Part 7-2: Basic communication structure for substation and feeder equipment - Abstract communication service interface (ACSI) EN 61850-7-21)
2003
IEC 61850-7-3 - Communication networks and systems for power utility automation -
Part 7-3: Basic communication structure - Common data classes EN 61850-7-3 -
ISO 10816 Series Mechanical vibration - Evaluation of machine vibration by measurement on non-rotating parts - -
ISO 13373-1 2002 Condition monitoring and diagnostics of machines - Vibration condition monitoring - Part 1: General procedures - -
1) EN 61850-7-2 is superseded by EN 61850-7-2:2010, which is based on IEC 61850-7-2:2010. SIST EN 61400-25-6:2011
SIST EN 61400-25-6:2011
IEC 61400-25-6 Edition 1.0 2010-11 INTERNATIONAL STANDARD
Wind turbines –
Part 25-6: Communications for monitoring and control of wind power plants – Logical node classes and data classes for condition monitoring
INTERNATIONAL ELECTROTECHNICAL COMMISSION V ICS 27.180 PRICE CODEISBN 978-2-88912-230-1
® Registered trademark of the International Electrotechnical Commission ® SIST EN 61400-25-6:2011 colourinside
– 2 – 61400-25-6 Ó IEC:2010(E) CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 8 2 Normative references . 9 3 Terms and definitions . 10 4 Abbreviated terms . 11 5 General . 14 5.1 Overview . 14 5.2 Condition monitoring information modelling . 15 5.3 Coordination system applied for identifying direction and angles . 16 5.4 Active power bin concept . 16 6 Common data class attributes . 17 6.1 General . 17 6.2 Attributes for condition monitoring measurement description. 17 7 Common data classes for wind turbine condition monitoring . 23 7.1 General . 23 7.2 Common data classes defined in IEC 61400-25-2 . 24 7.3 Condition monitoring bin (CMB) . 24 7.4 Condition monitoring measurement description (CMMD) . 24 7.5 Condition monitoring scalar value (CMSV) . 25 7.6 Scalar value array (SVA). 26 7.7 Condition monitoring scalar value array (CMSVA). 27 7.8 Condition monitoring vector value (CMVV) . 27 8 Logical nodes for wind turbine condition monitoring. 28 8.1 General . 28 8.2 Logical nodes inherited from IEC 61400-25-2 . 28 8.3 Wind turbine condition monitoring logical node WCON . 29 9 Data file (DAF) . 29
Figure 1 – Condition monitoring with separated TCD/CMD functions . 7 Figure 2 – Schematic flow of condition monitoring information . 8 Figure 3 – Reference coordinates system for the drive train . 16 Figure 4 – Active power bin concept . 17 Figure 5 – Sensor angular orientation . 20 Figure 6 – Sensor motion identification . 20 Figure 7 – Sensor normal and reverse motion . 21 Figure 8 – Principle of shaft and bearing numbering along a drive train . 21 Figure
A.1 – Gearbox example – Spectral analysis from an Iss sensor . 30 Figure
B.1 – Wind turbine condition monitoring measurements . 31
Table 1 – Abbreviated terms applied . 12 Table 2 – Coordinate system and wind turbine related characteristics . 16 Table 3 – Attributes used for measurement description. 18 SIST EN 61400-25-6:2011
61400-25-6 Ó IEC:2010(E) – 3 – Table 4 – Sensor identification convention . 18 Table 5 – Sensor type code . 19 Table 6 – Reference code for sensor sensitive axis orientation. 20 Table 7 – Gearbox shaft and bearing identification . 22 Table 8 – mxType values . 23 Table 9 – CDC: Condition monitoring bin (CMB) . 24 Table 10 – CDC: Condition monitoring measurement description (CMMD) . 25 Table 11 – CDC: Condition monitoring scalar value (CMSV) . 26 Table 12 – CDC: Scalar value array (SVA) . 26 Table 13 – CDC: Condition monitoring scalar value array (CMSVA) . 27 Table 14 – CDC: Condition monitoring vector value (CMVV) . 28 Table 15 – LN: Wind turbine condition monitoring information (WCON) . 29
SIST EN 61400-25-6:2011
– 4 – 61400-25-6 Ó IEC:2010(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
WIND TURBINES –
Part 25-6: Communications for monitoring
and control of wind power plants –
Logical node classes and data classes
for condition monitoring
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote interna-tional co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Tech-nical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publica-tion(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the Interna-tional Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all inter-ested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinter-pretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence be-tween any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and ex-penses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publica-tions.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of pa-tent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61400-25-6 has been prepared by IEC technical committee 88: Wind turbines. The text of this standard is based on the following documents: FDIS Report on voting 88/377A/FDIS 88/380/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. SIST EN 61400-25-6:2011
61400-25-6 Ó IEC:2010(E) – 5 – A list of all parts in the IEC 61400 series, published under the general title: Wind turbines, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data re-lated to the specific publication. At this date, the publication will be
• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended. A bilingual version of this publication may be issued at a later date.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understand-ing of its contents. Users should therefore print this document using a colour printer.
SIST EN 61400-25-6:2011
– 6 – 61400-25-6 Ó IEC:2010(E) INTRODUCTION The IEC 61400-25 series defines information models and information exchange models for monitoring and control of wind power plants. The modelling approach (for information models and information exchange models) of IEC 61400-25-2 and IEC 61400-25-3 uses abstract defi-nitions of classes and services such that the specifications are independent of specific com-munication protocol stacks, implementations, and operating systems. The mapping of these abstract definitions to specific communication profiles is defined in IEC 61400-25-4. Conformance to IEC 61400-25-6 requires in principle conformance to IEC 61400-25-2, IEC 61400-25-3 and IEC 61400-25-4.
The definitions in parts IEC 61400-25-1 to IEC 61400-25-5 apply also for this part 6 of the standard series. The purpose of this part of IEC 61400 is to define an information model for condition monitor-ing information and to define how to use the existing definitions of IEC 61400-25-2 and to de-fine the required extensions in order to describe and exchange information related to condi-tion monitoring of wind turbines. The models of condition monitoring information defined in this standard may represent information provided by sensors or by calculation. In the context of this standard, condition monitoring means a process with the purpose of ob-serving components or structures of a wind turbine or wind power plant for a period of time in order to evaluate the state of the components or structures and any changes to it, in order to detect early indications of impending failures. With the objective to be able to monitor compo-nents and structures in approximately the same conditions, this standard introduces a concept of sorting production or power levels of a wind turbine into power bins. The power bins con-cept is multidimensional in order to fit the purpose of sorting complex operational conditions into comparable circumstances. Condition monitoring is most frequently used as a predictive or condition-based maintenance technique (CBM). However, there are other predictive maintenance techniques that can also be used, including the use of the human senses (look, listen, feel, smell) or machine perfor-mance monitoring techniques. These could be considered to be part of the condition monitor-ing. Condition monitoring techniques Condition monitoring techniques that generate information to be modelled include, but are not limited to, measured or processed values such as: · vibration measurements and analysis; · oil debris measurement and analysis; · temperature measurement and analysis; · strain gauge measurement and analysis; · acoustic measurement and analysis. Components and structures can be monitored by using automatic measurement retrieval or via a manual process. Condition monitoring devices The condition monitoring functions may be located in different physical devices. Some infor-mation may be exposed by a turbine controller device (TCD) while other information may be exposed by an additional condition monitoring device (CMD). Various actors may request to exchange data values located in the TCD and/or CMD. A SCADA device may request data values from a TCD and/or CMD; a CMD may request data values from a TCD. The information SIST EN 61400-25-6:2011
61400-25-6 Ó IEC:2010(E) – 7 – exchange between an actor and a device in a wind power plant requires the use of infor-mation exchange services as defined in IEC 61400-25-3 and the additional required exchange services specified in this part 6. A summary of the above is depicted in Figure 1. Actors like Operators, Control Centre, maintenance teams, owners, . Actors like Operators, Control Centre, maintenance teams, owners, . IEC 61400-25-3, IEC 61400-25-4and IEC 61400-25-6Information ExchangeWind Turbine Control Device or function with Logical Nodes and Data ObjectsIEC 61400-25-3, IEC 61400-25-4and IEC 61400-25-6Information ExchangeIEC 61400-25-3, IEC 61400-25-4Information ExchangeCondition Monitoring Device or function with Logical Nodes and Data ObjectsInformation Exchange…Logical Nodes and Data ObjectsScope of standardGearboxGeneratorBrakeTowerTC/CM. Figure 1 – Condition monitoring with separated TCD/CMD functions The state of the art in the wind power industry is a topology with separated devices for control and condition monitoring applications. Based on this fact, the information and information ex-change modelling in the present document is based on a topology with a TCD and a CMD.
IEC 61400-25-6 must be perceived as an extension of the IEC 61400-25 series of standards with the focus on condition monitoring.
IEC
2433/10 SIST EN 61400-25-6:2011
– 8 – 61400-25-6 Ó IEC:2010(E) WIND TURBINES –
Part 25-6: Communications for monitoring
and control of wind power plants –
Logical node classes and data classes
for condition monitoring
1 Scope
This part of the IEC 61400-25 series specifies the information models related to condition monitoring for wind power plants and the information exchange of data values related to these models. Figure 2 illustrates the information flow of a system using condition monitoring to perform condition based maintenance. The figure illustrates how data values are refined and concen-trated through the information flow, ending up with the ultimate goal of condition based maintenance – actions to be performed via issuing work orders to maintenance teams in order to prevent the wind power plant device to stop providing its intended service. InformationInformationData reductionRefinement of informationScope of IEC 61400-25-6Information Figure 2 – Schematic flow of condition monitoring information IEC
2434/10 SIST EN 61400-25-6:2011
61400-25-6 Ó IEC:2010(E) – 9 – Condition monitoring is mainly based on the following kinds of information.
· Time waveform records (samples) of a specific time interval to be exchanged in real-time or by files for analysis (e.g. acceleration, position detection, speed, stress detec-tion). · Status information and measurements (synchronized with the waveform records) rep-resenting the turbine operation conditions.
· Results of time waveform record analysis of vibration data (scalar values, array val-ues, statistical values, historical (statistical) values, counters and status information). · Results of, for example, oil debris analysis. It is the purpose of this standard to model condition monitoring information by using the in-formation modelling approach as described in 6.2.2 of IEC 61400-25-1 and by extending the existing information model as specified in Clause 6 of IEC 61400-25-2, the information ex-change models specified in Clause 9 of IEC 61400-25-3 and the mapping to communication profiles as specified in IEC 61400-25-4. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61400-25-1:2006, Wind turbines – Communications for monitoring and control of wind power plants – Overall description of principles and models IEC 61400-25-2:2006, Wind turbines – Communications for monitoring and control of wind power plants – Information models IEC 61400-25-3:2006, Wind turbines – Communications for monitoring and control of wind power plants – Information exchange models IEC 61400-25-4, Wind turbines – Communications for monitoring and control of wind power plants – Mapping to communication profile IEC 61400-25-5, Communications for monitoring and control of wind power plants – Conform-ance testing IEC 61850-7-2:2003, Communication networks and systems in substations – Part 7-2: Basic communication structure for substation and feeder equipment – Abstract communication ser-vice interface (ACSI) IEC 61850-7-3, Communication networks and systems in substations – Part 7-3: Basic com-munication structure for substation and feeder equipment – Common data classes ISO 10816 (all parts), Mechanical vibration – Evaluation of machine vibration by measure-ments on non-rotating parts ISO 13373-1:2002, Condition monitoring and diagnostics of machines – Vibration condition monitoring – Part 1: General procedures SIST EN 61400-25-6:2011
– 10 – 61400-25-6 Ó IEC:2010(E) 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 61400-25-1 and the following apply. 3.1
actor any entity that receives (sends) data values from (to) another device
Examples of actors could be SCADA systems, maintenance systems, owner, etc. 3.2
mandatory term applied where specific content must be provided in order to comply with this standard 3.3
optional
term applied where specific content might be provided in compliance to this standard 3.4
conditional term applied where specific content defined must be provided depending on stated conditions in compliance to this standard 3.5
scalar value
data type representing a quantity which can be described by a single number, such as a tem-perature 3.6
data file in a computer system, an entity of data available to system users (including the system itself and its application programs) that is capable of being manipulated as an entity (for example, a file can be moved from one file directory to another as a whole entity) The file must have a unique name within its own directory. Some operating systems and ap-plications describe files with given formats by giving them a particular file name suffix. (The file name suffix is also known as a file name extension.) 3.7
peak value maximum excursion of a time wave form from its mean value within a specific time interval 3.8
peak-to-peak value difference between the positive and negative extreme values of a time wave form within a specific time interval 3.9
crest factor ratio of the peak value of a time waveform to the RMS value of the time waveform within a specific time interval
A crest factor is also named as a "peak-to-RMS-ratio". SIST EN 61400-25-6:2011
61400-25-6 Ó IEC:2010(E) – 11 – 3.10
root mean square value
RMS measure of the level of a signal calculated by squaring the instantaneous value of the signal, averaging the squared values over time, and taking the square root of the average value
The RMS value is the value which is used to calculate the energy or power in a signal. 3.11
band pass
BP filter that only passes energy between two frequencies which are named as lower and upper cut-off frequencies
Band pass filters can be fixed, where the cut-off frequencies are constant, and can be varia-ble, where the cut-off frequencies are a percentage of the centre frequency – named as con-stant percentage bandwidth filters. 3.12
order multiple of specific reference frequencies An FFT spectrum plot displayed in orders will have multiples of running speed along the hori-zontal axis. Orders are commonly referred to as 1x… for first of running speed, 2x. for the second order of the running speed, and so on. When an order is an integral number of the running speed, it may be referred to as a harmonic of the running speed, e.g. 2x… could be referred to as the 2nd harmonic of the running speed. 3.13
order analysis ability to study the amplitude changes of specific signals that are related to the rotational as-pects of a device 3.14
UFF 58 de-facto standard file format for storing noise and vibration information
The definition of the de facto standard UFF 58 can be accessed from the following link: http://www.sdrl.uc.edu/universal-file-formats-for-modal-analysis-testing-1
3.15
high frequency band pass
HFBP
overall measurement covering a high frequency range of 1 kHz to 10 kHz Bearing faults often result in one or more resonance effects in the high frequency range. Measurements limited to this frequency range are therefore well suited for detecting bearing faults. 4 Abbreviated terms CDC Common data class CM Condition monitoring (function) CMD Condition monitoring device DC Data class ING Common data class for integer setting value (see IEC 61850-7-3) LCB Log control block SIST EN 61400-25-6:2011
– 12 – 61400-25-6 Ó IEC:2010(E) LD Logical device LN Logical node LPHD Logical node physical device information RCB Report control block RMS Root mean square SAV Common data class for sampled analogue values (see IEC 61850-7-3) SHS Statistical and historical statistical data (as defined in IEC 61400-25-2, Annex A) SMV Sampled measured values;
...
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