Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of fixed power supply installations and apparatus

This European Standard applies to emission and immunity aspects of EMC for electrical and electronic apparatus and systems intended for use in railway fixed installations for power supply. This includes the power feed to the apparatus, the apparatus itself with its protective control circuits, trackside items such as switching stations, power autotransformers, booster transformers, substation power switchgear and power switchgear to other longitudinal and local supplies. Filters operating at railway system voltage (for example, for harmonic suppression or power factor correction) are not included in this standard since each site has special requirements. Filters would normally have separate enclosures with separate rules for access. If electromagnetic limits are required, these will appear in the specification for the equipment. If a port is intended to transmit or receive for the purpose of radio communication (intentional radiators, e.g. transponder systems), then the radiated emission requirement in this standard are not intended to be applicable to the intentional transmission from a radio-transmitter as defined by the ITU. The frequency range considered is from DC to 400 GHz. No measurements need to be performed at frequencies where no requirement is specified. Emission and immunity limits are given for items of apparatus which are situated: a) within the boundary of a substation which delivers electric power to a railway; b) beside the track for the purpose of controlling or regulating the railway power supply, including power factor correction; c) along the track for the purpose of supplying electrical power to the railway other than by means of the conductors used for contact current collection, and associated return conductors. Included are high voltage feeder systems within the boundary of the railway which supply substations at which the voltage is reduced to the railway system voltage; d) beside the track for controlling or regulating electric power supplies to ancillary railway uses. This category includes power supplies to marshalling yards, maintenance depots and stations; e) various other non-traction power supplies from railway sources which are shared with railway traction. The immunity levels given in this standard apply for: - vital equipment such as protection devices; - equipment having connections to the traction power conductors; - apparatus inside the 3 m zone; - ports of apparatus inside the 10 m zone with connection inside the 3 m zone; - ports of apparatus inside the 10 m zone with cable length > 30 m. Apparatus and systems which are in an environment which can be described as residential, commercial or light industry, even when placed within the physical boundary of the railway substation, shall comply with EN 61000 6 1:2007 for immunity and EN 61000 6 3:2007 for emission requirements. Excluded from the immunity requirements of this standard is power supply apparatus which is intrinsically immune to the tests defined in Tables 1 to 6. NOTE An example is an 18 MVA 230 kV to 25 kV power supply transformer. These specific provisions are to be used in conjunction with the general provisions in EN 50121 1. This part of the standard covers requirements for both apparatus and fixed installations. The sections for fixed installations are not relevant for CE marking.

Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 5: Störaussendungen und Störfestigkeit von ortsfesten Anlagen und Einrichtungen der Bahnenergieversorgung

Applications ferroviaires - Compatibilité électromagnétique - Partie 5 : Emission et immunité des installations fixes d'alimentation de puissance et des équipements associés

La présente Norme européenne s’applique aux aspects d’émission et d’immunité de CEM pour les appareils et les systèmes électriques et électroniques destinés à être utilisés dans les installations fixes associées à l’alimentation. Cela concerne l’alimentation des appareils, les appareils eux-mêmes avec leurs circuits de commande de protection, les composants au bord des voies tels que les stations de sectionnement, les autotransformateurs, les transformateurs suceurs, les appareillages de coupure de sous-station et les appareillages de coupure d’autres alimentations longitudinales et locales. Les filtres qui fonctionnent à la tension du système ferroviaire (par exemple, pour la suppression d’harmoniques ou la correction de facteur de puissance) ne sont pas inclus dans la présente Norme dans la mesure où chaque site répond à des exigences spéciales. Normalement, les filtres sont dans des enceintes séparées avec des règles d’accès particulières. Si des limites électromagnétiques sont nécessaires, elles apparaîtront dans la spécification pour l’équipement. Si un accès est prévu pour transmettre ou recevoir à des fins de communication radio (éléments rayonnants intentionnels, par exemple les systèmes de transpondeur), alors les exigences des émissions rayonnées de cette norme ne sont pas destinées à être applicables pour les transmissions intentionnelles d’un émetteur radioélectrique comme défini par l’UIT. La plage de fréquences concernée va du courant continu à 400 GHz. Aucune mesure n’est nécessaire aux fréquences pour lesquelles aucune exigence n’est spécifiée. Les limites d’émission et d’immunité sont données pour les composants des appareils qui sont situés: a) dans les limites de la sous-station qui alimente le réseau de traction en électricité; b) près des voies pour contrôler et réguler l’alimentation électrique du réseau de traction, y compris la correction de facteur de puissance; c) le long de la voie pour fournir de l’énergie électrique au système ferroviaire par d’autres moyens que les conducteurs utilisés pour le captage du courant de contact et les conducteurs de retour associés. Ceci englobe les systèmes d’alimentation à haute tension dans les limites du système ferroviaire qui alimentent les sous-stations dans lesquelles la tension est ramenée à la valeur de la tension du système ferroviaire; d) près des voies pour contrôler et réguler les alimentations électriques utilisées à différents usages ferroviaires auxiliaires. Cette catégorie englobe les alimentations des installations de triage, des dépôts de maintenance et des gares; e) différentes alimentations qui ne concernent pas la traction alimentées par une des sources ferroviaires qui sont partagées avec la traction ferroviaire. Les niveaux d’immunité donnés dans la présente Norme s'appliquent aux - équipements vitaux tels que les dispositifs de protection; - équipements dotés de raccordements vers les conducteurs de puissance de traction; - appareils situés dans la zone de 3 m; - accès des appareils situés dans la zone de 10 m avec connexion dans la zone de 3 m; - accès des appareils situés dans la zone de 10 m avec longueur de câble > 30 m. Les appareils et les systèmes qui sont dans un environnement qui peut être décrit comme résidentiel, commercial ou d’industrie légère, même s’ils sont situés dans les limites physiques de la sous-station ferroviaire, doivent être conformes à l’EN 61000-6-1:2007 pour l’immunité et l’EN 61000-6-3 pour les exigences d’émission. Les appareils d’alimentation qui ont une immunité intrinsèque aux essais définis aux Tableaux 1 à 6 sont exclus des exigences relatives à l’immunité de la présente Norme. NOTE Un transformateur 18 MVA 230 kV / 25 kV en est un exemple. (...)

Železniške naprave - Elektromagnetna združljivost - 5. del: Sevanje in odpornost stabilnih močnostnih napajalnih inštalacij in naprav

Ta evropski standard se uporablja za vidike glede sevanja in odpornosti elektromagnetne združljivosti za električne in elektronske naprave ter sisteme, namenjene za uporabo v železniških stabilnih napravah električne vleke za napajanje. To vključuje napajanje naprave, samo napravo z zaščitnim krmiljenjem, elemente ob progi, kot so stikalne postaje, energetski avtotransformatorji, ojačevalni transformatorji, močnostne stikalne naprave transformatorskih postaj in močnostne stikalne naprave za druga vzdolžna in lokalna napajanja.
Filtri, ki delujejo pri napetosti železniškega sistema (na primer za harmonično dušenje ali korekcijo faktorja moči), niso vključeni v ta standard, ker ima vsako mesto uporabe posebne zahteve. Filtri imajo običajno ločena ohišja z ločenimi pravili za dostop. Če so zahtevane mejne vrednosti elektromagnetnosti, so prikazane v specifikaciji opreme.
Če so vrata namenjena oddajanju ali sprejemanju za radijsko komunikacijo (namenski radiatorji, npr. sistemi transponderjev), se zahteva glede sevanja v tem standardu ne uporablja za namensko oddajanje radijskega oddajnika, kot je opredeljeno v ITU.
Obravnavan frekvenčni razpon je od DC do 400 GHz. Za frekvence, za katere ni določenih zahtev, ni treba opraviti meritev.
Mejne vrednosti sevanja in odpornosti so podane za elemente naprave, ki se nahajajo:
a)   na ozemlju transformatorske postaje, ki zagotavlja električno napajanje za železnico;
b)   ob progi za namene nadzora in uravnavanja napajanja železniške proge, vključno s korekcijo faktorja moči;
c)   vzdolž proge za namene oskrbe železnice z električno energijo, ki ne poteka prek vodov, ki se uporabljajo za kontaktne tokovne odjemnike, in povezanih povratnih vodov. Vključeni so visokonapetostni napajalni sistemi na ozemlju železnice, ki oskrbujejo transformatorske postaje, kjer se napetost zmanjša na napetost železniškega sistema;
d)    ob progi za nadzor ali uravnavanje električnega napajanja pomožnih železniških objektov. Ta kategorija vključuje napajanje ranžirnih postaj, vzdrževalnih prostorov in postaj;
e)    različna druga nevlečna napajanja iz železniških virov, ki so v skupni rabi z železniško vleko.
Ravni odpornosti, podane v tem standardu, veljajo za:
-   ključno opremo, kot so zaščitne naprave;
-   opremo, povezano z vlečnimi napajalnimi vodniki;
-   naprave znotraj območja 3 m;
-   vrata naprav znotraj območja 10 m s povezavo znotraj območja 3 m;
-   vrata naprav znotraj območja 10 m z dolžino kabla > 30 m.
Naprave in sistemi v okolju, ki ga lahko opišemo kot stanovanjskega, komercialnega ali manj zahtevno industrijskega, tudi če se nahajajo znotraj fizičnega ozemlja železniške transformatorske postaje, morajo biti skladni s standardom EN 61000 6 1:2007 za odpornost in standardom EN 61000 6 3:2007 za zahteve glede sevanja.
Iz zahtev tega standarda glede odpornosti so izključene napajalne naprave, ki so same po sebi odporne na preskuse, določene v preglednicah 1–6.
OPOMBA:   Primer je napajalni transformator 18 MVA iz 230 kV v 25 kV.
Te posebne določbe je treba uporabljati v povezavi s splošnimi določbami standarda EN 50121 1.
Ta del standarda zajema zahteve za naprave in stabilne naprave električne vleke. Razdelki za stabilne naprave električne vleke niso ustrezni za oznake CE.

General Information

Status
Published
Publication Date
09-Mar-2017
Current Stage
6060 - Document made available
Due Date
16-Mar-2017

RELATIONS

Buy Standard

Standard
EN 50121-5:2017
English language
20 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 50121-5:2017
01-maj-2017
1DGRPHãþD
SIST EN 50121-5:2015
äHOH]QLãNHQDSUDYH(OHNWURPDJQHWQD]GUXåOMLYRVWGHO6HYDQMHLQRGSRUQRVW
VWDELOQLKPRþQRVWQLKQDSDMDOQLKLQãWDODFLMLQQDSUDY

Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of

fixed power supply installations and apparatus

Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 5: Störaussendungen und

Störfestigkeit von ortsfesten Anlagen und Einrichtungen der Bahnenergieversorgung

Applications ferroviaires - Compatibilité électromagnétique - Partie 5 : Emission et

immunité des installations fixes d'alimentation de puissance et des équipements
associés
Ta slovenski standard je istoveten z: EN 50121-5:2017
ICS:
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
45.020 Železniška tehnika na Railway engineering in
splošno general
SIST EN 50121-5:2017 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 50121-5:2017
---------------------- Page: 2 ----------------------
SIST EN 50121-5:2017
EUROPEAN STANDARD EN 50121-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2017
ICS 29.280; 33.100.01; 45.020 Supersedes EN 50121-5:2015
English Version
Railway applications - Electromagnetic compatibility - Part 5:
Emission and immunity of fixed power supply installations and
apparatus

Applications ferroviaires - Compatibilité électromagnétique - Bahnanwendungen - Elektromagnetische Verträglichkeit -

Partie 5 : Emission et immunité des installations fixes Teil 5: Störaussendungen und Störfestigkeit von ortsfesten

d'alimentation de puissance et des équipements associés Anlagen und Einrichtungen der Bahnenergieversorgung

This European Standard was approved by CENELEC on 2017-02-06. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50121-5:2017 E
---------------------- Page: 3 ----------------------
SIST EN 50121-5:2017
EN 50121-5:2017 (E)
Contents Page

European foreword ................................................................................................................................. 3

Introduction ............................................................................................................................................. 4

1 Scope .......................................................................................................................................... 5

2 Normative references ................................................................................................................ 6

3 Terms, definitions and abbreviations ...................................................................................... 6

3.1 Terms and definitions ............................................................................................................... 6

3.2 Abbreviations ............................................................................................................................. 7

4 Performance criteria .................................................................................................................. 7

5 Emission tests and limits .......................................................................................................... 7

5.1 Emission from the substation to the outside world ............................................................... 7

5.2 Emission test for apparatus operating at less than 1 000 V rms AC .................................... 8

5.3 Emission values within the boundary of the substation ....................................................... 8

6 Immunity requirements ............................................................................................................. 8

7 Fixed power supplies on railway property which are not used for railway traction

purposes ................................................................................................................................................ 15

Annex A (informative) Emission within the boundary of the substation for normal

operation and during the operation of switches ............................................................................... 16

Annex ZZ (informative) Relationship between this European Standard and the essential

requirements of Directive 2014/30/EU [2014 OJ L96] aimed to be covered .................................... 19

Bibliography .......................................................................................................................................... 20

---------------------- Page: 4 ----------------------
SIST EN 50121-5:2017
EN 50121-5:2017 (E)
European foreword

This document (EN 50121-5:2017) has been prepared by CLC/TC 9X: “Electrical and electronic

applications for railways”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2017-11-06
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2020-02-06
conflicting with this document have to
be withdrawn
This document supersedes EN 50121-5:2015.

EN 50121-5:2017 includes the following significant technical changes with respect to

EN 50121-5:2015:
- clarification of scope (Clause 1);
- set dated normative references (Clause 2);

- emission requirement extended in the frequency range 1 GHz to 6 GHz following EN 61000-6-4;

- immunity requirement extended in the frequency range 5,1 GHz to 6 GHz;

- removal of limits for radiated H-fields in the frequency range 9 kHz to 150 kHz due to the fact that:

- there are very few outside world victims;
- there is low reproducibility;
- revision of Annex ZZ.
This European Standard is to be read in conjunction with EN 50121-1.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

This document has been prepared under a mandate given to CENELEC by the European Commission

and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this

document.

This standard forms Part 5 of the European Standard series EN 50121, published under the general

title “Railway applications - Electromagnetic compatibility”. The series consists of:

- Part 1: General
- Part 2: Emission of the whole railway system to the outside world
- Part 3-1: Rolling stock - Train and complete vehicle
- Part 3-2: Rolling stock - Apparatus

- Part 4: Emission and immunity of the signalling and telecommunications apparatus

- Part 5: Emission and immunity of fixed power supply installations and apparatus

---------------------- Page: 5 ----------------------
SIST EN 50121-5:2017
EN 50121-5:2017 (E)
Introduction

The requirements of this standard have been specified so as to ensure a level of electromagnetic

emission which will cause minimal disturbance to other equipment. The levels, however, do not cover

the following cases:

a) which may occur with an extremely low probability of occurrence in any location;

b) where highly susceptible apparatus will be used in close proximity of the equipment covered by

this standard, in which case further measures may have to be taken.

The emission limits given are on the basis that the equipment of the product family range is installed in

railway substation areas.
---------------------- Page: 6 ----------------------
SIST EN 50121-5:2017
EN 50121-5:2017 (E)
1 Scope

This European Standard applies to emission and immunity aspects of EMC for electrical and electronic

apparatus and systems intended for use in railway fixed installations for power supply. This includes

the power feed to the apparatus, the apparatus itself with its protective control circuits, trackside items

such as switching stations, power autotransformers, booster transformers, substation power

switchgear and power switchgear to other longitudinal and local supplies.

Filters operating at railway system voltage (for example, for harmonic suppression or power factor

correction) are not included in this standard since each site has special requirements. Filters would

normally have separate enclosures with separate rules for access. If electromagnetic limits are

required, these will appear in the specification for the equipment.

If a port is intended to transmit or receive for the purpose of radio communication (intentional radiators,

e.g. transponder systems), then the radiated emission requirement in this standard are not intended to

be applicable to the intentional transmission from a radio-transmitter as defined by the ITU.

The frequency range considered is from DC to 400 GHz. No measurements need to be performed at

frequencies where no requirement is specified.

Emission and immunity limits are given for items of apparatus which are situated:

a) within the boundary of a substation which delivers electric power to a railway;

b) beside the track for the purpose of controlling or regulating the railway power supply, including

power factor correction;

c) along the track for the purpose of supplying electrical power to the railway other than by means of

the conductors used for contact current collection, and associated return conductors. Included are

high voltage feeder systems within the boundary of the railway which supply substations at which

the voltage is reduced to the railway system voltage;

d) beside the track for controlling or regulating electric power supplies to ancillary railway uses. This

category includes power supplies to marshalling yards, maintenance depots and stations;

e) various other non-traction power supplies from railway sources which are shared with railway

traction.
The immunity levels given in this standard apply for:
- vital equipment such as protection devices;
- equipment having connections to the traction power conductors;
- apparatus inside the 3 m zone;
- ports of apparatus inside the 10 m zone with connection inside the 3 m zone;
- ports of apparatus inside the 10 m zone with cable length > 30 m.

Apparatus and systems which are in an environment which can be described as residential,

commercial or light industry, even when placed within the physical boundary of the railway substation,

shall comply with EN 61000-6-1:2007 for immunity and EN 61000-6-3:2007 for emission requirements.

Excluded from the immunity requirements of this standard is power supply apparatus which is

intrinsically immune to the tests defined in Tables 1 to 6.
NOTE An example is an 18 MVA 230 kV to 25 kV power supply transformer.

These specific provisions are to be used in conjunction with the general provisions in EN 50121-1.

---------------------- Page: 7 ----------------------
SIST EN 50121-5:2017
EN 50121-5:2017 (E)

This part of the standard covers requirements for both apparatus and fixed installations. The sections

for fixed installations are not relevant for CE marking.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

EN 50121-1:2017, Railway applications - Electromagnetic compatibility - Part 1: General

EN 50121-2:2017, Railway applications - Electromagnetic compatibility - Part 2: Emission of the whole

railway system to the outside world

EN 61000-4-2:2009, Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement

techniques - Electrostatic discharge immunity test (IEC 61000-4-2:2008)

EN 61000-4-3:2006, Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement

techniques - Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2006)

EN 61000-4-4:2012, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement

techniques — Electrical fast transient/burst immunity test (IEC 61000-4-4:2012)

EN 61000-4-5:2006, Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement

techniques - Surge immunity test (IEC 61000-4-5:2005)

EN 61000-4-6:2009, Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement

techniques - Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-

6:2008)

EN 61000-4-8:2010, Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement

techniques - Power frequency magnetic field immunity test (IEC 61000-4-8:2009)

EN 61000-4-18:2007, Electromagnetic compatibility (EMC) - Part 4-18: Testing and measurement

techniques - Damped oscillatory wave immunity test (IEC 61000-4-18:2006)

EN 61000-6-4:2007 , Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission

standard for industrial environments (IEC 61000-6-4:2006)
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
apparatus

electric or electronic product with an intrinsic function intended for implementation into a fixed railway

installation
As impacted by EN 61000-6-4:2007/A1:2011.
---------------------- Page: 8 ----------------------
SIST EN 50121-5:2017
EN 50121-5:2017 (E)
3.1.2
environment

surrounding objects or region which may influence the behaviour of the system and or may be

influenced by the system
3.1.3
railway substation

installation, the main function of which is to supply a contact line system at which the voltage of a

primary supply system, and in some cases the frequency, is transformed to the voltage and frequency

of the contact line
3.1.4
long bus
bus cables with a length of more than 30 m
3.1.5
3 m zone

area along the railway line within a distance of 3 m from the centreline of the nearest track at both

sides of the track
3.1.6
10 m zone

area along the railway line within a distance of 10 m from the centreline of the nearest track at both

sides of the track
3.2 Abbreviations
For the purposes of this document, the following abbreviations apply.
AC Alternating current
AM Amplitude modulation
CE Communauté Européenne
DC Direct current
EMC Electromagnetic compatibility
ITU International Telecommunication Union
Rms Root Mean Square
4 Performance criteria

The variety and diversity of the apparatus within the scope of this document make it difficult to define

precise criteria for the evaluation of the immunity test results. Three general levels of performance are

therefore used, as defined in EN 50121-1.
5 Emission tests and limits
5.1 Emission from the substation to the outside world

Limit values for this emission, over the frequency range 150 kHz to 1 GHz are given in EN 50121-2.

Guidance values are given in EN 50121-2 for emission of DC and power frequency magnetic fields.

Conductors (overhead or underground) between the substation and the railway are part of the railway

installation, but because of their wide variety of positions and ampere loadings, limit values cannot be

set for the magnetic fields which they produce.
---------------------- Page: 9 ----------------------
SIST EN 50121-5:2017
EN 50121-5:2017 (E)

No limits are set for emissions into the active space of the underground railway due to the complexities

of obtaining measurements in the confined space and the lack of a precise method of relating the

measured values to the degree of disturbance which other apparatus would suffer.

No measurements are necessary for total underground railway systems with no surface operation.

5.2 Emission test for apparatus operating at less than 1 000 V rms AC

The emission limits for apparatus covered by this standard which is supplied with electrical power at a

voltage below 1 000 V rms are given on a port by port basis in EN 61000-6-4.
5.3 Emission values within the boundary of the substation

Because there is such a wide variety of options for the design and the construction of the substation,

limits are not given for emission within the general space inside the boundary of the substation.

Practical measurements have been made and guidance values are gi
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.