IEC 62888-6:2019
(Main)Railway applications - Energy measurement on board trains - Part 6: Requirements for purposes other than billing
Railway applications - Energy measurement on board trains - Part 6: Requirements for purposes other than billing
IEC 62888-6:2019 specifies the specific requirements for EMS to be used for benchmarking, daily energy consumption monitoring, technical research and development.
This document provides the requirements for monitoring consumed energy on board in daily services in an easy way and the measured data are applicable for general purposes in industry such as energy management, energy saving, etc. However, this document is not applicable for billing purposes.
The practical purposes in industrial fields are, e.g.:
a) monitoring daily energy consumption of vehicles
b) obtaining data on influential factors, such as operational commands and surrounding conditions, in order to analyse relations between operations and energy;
c) energy management of power flow between vehicles and fixed installations;
d) implementing investigation tests of research and development for vehicle systems;
e) energy cost forecasting for analysing overall efficiency and consumption.
The requirements specified in this document supplement and/or amend the requirements specified in IEC 62888-1 to IEC 62888-5.
Applications ferroviaires - Mesure d'énergie à bord des trains - Partie 6: Exigences à des fins autres que la facturation
l'IEC 62888-6:2019 spécifie les exigences particulières de l'EMS à des fins d'évaluation comparative, de surveillance de la consommation d'énergie journalière, de recherche et développement techniques.
Le présent document établit les exigences relatives à une surveillance simplifiée de l'énergie consommée à bord des trains dans le cadre de leurs services quotidiens. Il est destiné à des applications industrielles générales, telles que la gestion de l'énergie, l'économie d'énergie, etc., mais ne couvre pas les applications de facturation.
Les domaines industriels couvrent diverses applications pratiques, par exemple:
a) surveillance de la consommation d'énergie journalière des véhicules;
b) obtention de données sur les facteurs d'influence, tels que les commandes opérationnelles et conditions environnantes, en vue d'analyser les relations entre les opérations et l'énergie;
c) gestion de l'énergie du flux de puissance entre les véhicules et les installations fixes;
d) mise en œuvre d'essais d'investigation pour la recherche et le développement de systèmes de véhicules;
e) prévisions des coûts de l’énergie pour l’analyse de l’efficacité globale et de la consommation.
Les exigences spécifiées dans le présent document complètent et/ou modifient celles spécifiées dans les Parties 1 à 5 de l'IEC 62888
General Information
Standards Content (Sample)
IEC 62888-6 ®
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Railway applications – Energy measurement on board trains –
Part 6: Requirements for purposes other than billing
Applications ferroviaires – Mesure d'énergie à bord des trains –
Partie 6: Exigences à des fins autres que la facturation
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IEC 62888-6 ®
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Railway applications – Energy measurement on board trains –
Part 6: Requirements for purposes other than billing
Applications ferroviaires – Mesure d'énergie à bord des trains –
Partie 6: Exigences à des fins autres que la facturation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 45.060.01 ISBN 978-2-8322-6092-0
– 2 – IEC 62888-6:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 10
2 Normative references . 11
3 Terms, definitions, abbreviated terms and symbols . 12
3.1 Terms and definitions . 12
3.2 Abbreviated terms . 12
3.3 Symbols . 13
4 Requirements . 13
4.1 General . 13
4.1.1 Overview . 13
4.1.2 Applications and usage . 13
4.1.3 Measurement system configuration . 14
4.1.4 Data to be acquired . 15
4.2 Requirement amendments to IEC 62888-1 . 15
4.2.1 General [IEC 62888-1:2018, 4.1] . 15
4.2.2 System level requirements [IEC 62888-1:2018, 4.2] . 15
4.2.3 Device level requirements [IEC 62888-1:2018, 4.3] . 16
4.3 Requirement amendments to IEC 62888-2 . 18
4.3.1 General [IEC 62888-2:2018, 4.1] . 18
4.3.2 Energy Measurement Function (EMF) [IEC 62888-2:2018, 4.2] . 18
4.3.3 Sensors [IEC 62888-2:2018, 4.3] . 21
4.3.4 Energy Calculation Function (ECF) [IEC 62888-2:2018, 4.4] . 26
4.4 Requirement amendments to IEC 62888-3 . 30
4.4.1 General [IEC 62888-3:2018, 4.1] . 30
4.4.2 Time data [IEC 62888-3:2018, 4.2] . 31
4.4.3 Energy data [IEC 62888-3:2018, 4.3] . 32
4.4.4 Location data [IEC 62888-3:2018, 4.4] . 32
4.4.5 Other received or produced data [IEC 62888-3:2018, 4.5] . 33
4.4.6 Consumption point ID [IEC 62888-3:2018, 4.6] . 33
4.4.7 Production of CEMD [IEC 62888-3:2018, 4.7] . 33
4.4.8 DHS data storage [IEC 62888-3:2018, 4.8] . 34
4.4.9 Transmission of CEMD from DHS to DCS [IEC 62888-3:2018, 4.9] . 34
4.4.10 Marking and essential information [IEC 62888-3:2018, 4.10] . 35
4.4.11 Event recording [IEC 62888-3:2018, 4.11] . 35
4.4.12 DCS [IEC 62888-3:2018, 4.12] . 35
4.5 Requirement amendments to IEC 62888-4 . 35
4.5.1 Overview [IEC 62888-4:2018, 4.1] . 35
4.5.2 On board communication subsystem [IEC 62888-4:2018, 4.2]. 35
4.5.3 On board to ground communication subsystem [IEC 62888-4:2018, 4.3] . 37
4.5.4 Access security [IEC 62888-4:2018, 4.4] . 37
4.6 Amendments to conformance test approach in IEC 62888-5. 37
4.6.1 General [IEC 62888-5:2018, 4.1] . 37
4.6.2 Situation of applicability [IEC 62888-5:2018, 4.2] . 37
4.6.3 General methodology [IEC 62888-5:2018, 4.3]. 37
4.6.4 EMS system level specific methodology [IEC 62888-5:2018, 4.4] . 38
5 Conformance test . 38
5.1 General . 38
5.2 Conformance test amendments to IEC 62888-2 . 38
5.2.1 General [IEC 62888-2:2018, 5.1] . 38
5.2.2 Testing framework [IEC 62888-2:2018, 5.2] . 38
5.2.3 Design review [IEC 62888-2:2018, 5.3] . 39
5.2.4 Type testing [IEC 62888-2:2018, 5.4] . 39
5.2.5 Routine test [IEC 62888-2:2018, 5.5] . 46
5.3 Conformance test amendments to IEC 62888-3 . 48
5.3.1 Procedural framework [IEC 62888-3:2018, 5.1] . 48
5.3.2 Testing framework [IEC 62888-3:2018, 5.2] . 49
5.3.3 Design review [IEC 62888-3:2018, 5.3] . 49
5.3.4 Type test [IEC 62888-3:2018, 5.4] . 50
5.3.5 Routine testing [IEC 62888-3:2018, 5.5] . 51
5.4 Conformance test amendments to IEC 62888-4 . 51
5.4.1 General [IEC 62888-4:2018, 5.1] . 51
5.4.2 PICS and PIXIT [IEC 62888-4:2018, 5.2] . 52
5.4.3 Design review [IEC 62888-4:2018, 5.3] . 52
5.4.4 Type test procedure [IEC 62888-4:2018, 5.4] . 52
5.5 Amendments to conformance test procedures [IEC 62888-5:2018, 5] . 53
5.5.1 General [IEC 62888-5:2018, 5.1] . 53
5.5.2 EMS integration design review [IEC 62888-5:2018, 5.2] . 53
5.5.3 EMS integration type test [IEC 62888-5:2018, 5.3] . 53
5.5.4 EMS installation design review [IEC 62888-5:2018, 5.4] . 54
5.5.5 EMS Installation type test [IEC 62888-5:2018, 5.5] . 55
5.5.6 EMS installation routine test [IEC 62888-5:2018, 5.6] . 56
5.5.7 Periodic re-verification [IEC 62888-5:2018, 5.7] . 56
5.5.8 Replacement of devices and ancillary components [IEC 62888-5:2018,
5.8] . 57
6 Amendments to the relevant Annexes in IEC 62888-1 to IEC 62888-5 . 57
6.1 Amendments to Annexes in IEC 62888-1:2018 . 57
6.2 Amendments to Annexes in IEC 62888-2:2018 . 57
6.2.1 Annex A (normative) Test with magnetic induction of external origin
[IEC 62888-2:2018]. 57
6.2.2 Annex B (normative) EMF configurations [IEC 62888-2:2018] . 57
6.2.3 Annex C (informative) Expressing EMF accuracy [IEC 62888-2:2018] . 57
6.2.4 Annex D (informative) Re-verification and defining of its regime
recommendations [IEC 62888-2:2018] . 57
6.2.5 Annex E (informative) Durability test [IEC 62888-2:2018] . 57
6.3 Amendments to Annexes in IEC 62888-3:2018 . 57
6.4 Amendments to Annexes in IEC 62888-4:2018 . 58
6.4.1 Annex A (normative) On board to ground communication preferred
solution [IEC 62888-4:2018] . 58
6.4.2 Annex B (informative) VEI–VMF/CMF to ECF interface implementation
example [IEC 62888-4:2018] . 58
6.4.3 Annex C (informative) PICS structure and instruction [IEC 62888-
4:2018] . 58
6.4.4 Annex D (informative) Access security [IEC 62888-4:2018] . 58
6.5 Amendments to Annexes in IEC 62888-5:2018 . 58
Annex A (informative) Examples of installation points in case of distributed
measurement . 59
– 4 – IEC 62888-6:2019 © IEC 2019
A.1 General . 59
A.2 DC power supply . 59
A.2.1 ECF function in TCN . 59
A.2.2 Substantial data for energy measurement on board, e.g. current and
voltage . 60
A.3 AC power supply . 61
Annex B (informative) Measurement of non-sinusoidal waveform . 63
Annex C (informative) The differences between Level 1, Level 2 and Level 3 . 64
Bibliography . 73
Figure 1 – EMS functional structure and dataflow diagram . 9
Figure 2 – Primary current and voltage ranges [IEC 62888-2:2018, Figure 6] . 29
Figure 3 – Test point matrix for ECF accuracy tests (type test) [IEC 62888-2:2018,
Figure 8] . 44
Figure 4 – Test point matrix for ECF accuracy tests (routine test) [IEC 62888-2:2018,
Figure 15] . 48
Figure A.1 – An example of ECF function in TCN for DC power supply . 60
Figure A.2 – An example of only current and voltage measured on board for DC power
supply . 61
Figure A.3 – An example of ECF function in control unit for AC power supply . 62
Table 1 – Levels of performance [IEC 62888-1:2018, Table 1] . 11
Table 2 – EMF percentage error limits at reference conditions for Level 3 [IEC 62888-
2:2018, Table 2] . 20
Table 3 – Level 3 additional percentage error limits – VMF [IEC 62888-2:2018, Table 3] . 23
Table 4 – Level 3 additional percentage error limits – AC CMF [IEC 62888-2:2018,
Table 7] . 24
Table 5 – Level 3 additional percentage error limits – DC CMF [IEC 62888-2:2018,
Table 8] . 25
Table 6 – Level 3 ECF additional percentage error limits for active energy [IEC 62888-
2:2018, Table 15] . 28
Table C.1 – The differences between Level 1, Level 2 and Level 3 . 65
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS –
ENERGY MEASUREMENT ON BOARD TRAINS –
Part 6: Requirements for purposes other than billing
FOREWORD
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International Standard IEC 62888-6 has been prepared by IEC technical committee 9:
Electrical equipment and systems for railways.
This standard supplements and/or amends the requirements specified in IEC 62888-1 to
IEC 62888-5 which are based on EN 50463.
The text of this standard is based on the following documents:
FDIS Report on voting
9/2431/FDIS 9/2450/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
– 6 – IEC 62888-6:2019 © IEC 2019
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62888 series, published under the general title Railway
applications – Energy measurement on board trains, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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
understanding of its contents. Users should therefore print this document using a
colour printer.
INTRODUCTION
Three levels are introduced for categorizing EMS as described in Clause 1.
This is Part 6 of the IEC 62888 series which consists of the following parts, under the general
title Railway applications – Energy measurement on board trains:
Part 1: General
Part 2: Energy measurement
Part 3: Data handling
Part 4: Communication
Part 5: Conformance test
Part 6: Requirements for purposes other than billing
This series of International Standards follows the functional guidelines description in Annex A,
“Principles of conformity assessment”, of ISO/IEC 17000:2004 tailored to the Energy
Measurement System (EMS).
The Energy Measurement System (EMS) provides measurement and data suitable for
applications such as energy management, energy saving, billing and others.
This series of International Standards uses the functional approach to describe the EMS.
These functions are implemented in one or more physical devices. The user of this series of
standards is free to choose the physical implementation arrangements.
Structure and main contents of the IEC 62888 series
This series of International Standards is divided into six parts. The titles and brief descriptions
of each part are given below:
IEC 62888-1 – General
The scope of IEC 62888-1 is the Energy Measurement System (EMS).
IEC 62888-1 provides system level requirements for the complete EMS and common
requirements for all devices implementing one or more functions of the EMS.
IEC 62888-2 – Energy measurement
The scope of IEC 62888-2 is the Energy Measurement Function (EMF).
The EMF provides measurement of the consumed and regenerated active energy of a traction
unit. If the traction unit is designed for use on AC traction supply systems, the EMF also
provides measurement of reactive energy. The EMF provides the measured quantities via an
interface to the Data Handling System.
The EMF consists of the three functions: Voltage Measurement Function, Current
Measurement Function and Energy Calculation Function. For each of these functions,
accuracy classes are specified and associated reference conditions are defined. This part
also defines all specific requirements for all functions of the EMF.
The Voltage Measurement Function measures the voltage of the contact line (CL) system and
the Current Measurement Function measures the current taken from and returned to the CL
system. These functions provide signal inputs to the Energy Calculation Function.
– 8 – IEC 62888-6:2019 © IEC 2019
The Energy Calculation Function inputs the signals from the Current and Voltage
Measurement Functions and calculates a set of values representing the consumed and
regenerated energies. These values are transferred to the Data Handling System and are
used in the creation of Compiled Energy Measured Data.
All relevant metrological aspects are covered in this part of IEC 62888.
IEC 62888-2 also defines the conformance test of the EMF.
IEC 62888-3 – Data handling
The scope of IEC 62888-3 is the Data Handling System (DHS).
The on board DHS receives, produces and stores data, ready for transmission to any
authorised receiver of data on board or on ground. The main goal of the DHS is to produce
Compiled Energy Measured Data and transfer it to an on-ground Data Collection Service
(DCS). The DHS can support another functionality on board or on-ground with data, as long
as this does not conflict with the main goal.
IEC 62888-3 also defines the conformance test of the DHS.
IEC 62888-4 – Communication
The scope of IEC 62888-4 is the communication services.
This part of IEC 62888 gives requirements and guidance regarding the data between the
functions implemented within EMS as well as between such functions and other on board
units where data are exchanged using a communications protocol stack over a dedicated
physical interface or a shared network.
It includes the on board to ground communication service and covers the requirements
necessary to support data transfer between DHS and DCS.
IEC 62888-4 also defines the conformance test of the communications services.
IEC 62888-5 – Conformance test
The scope of IEC 62888-5 is the conformance test procedures for the EMS.
IEC 62888-5 also covers re-verification procedures and conformance test in the event of the
replacement of a device of the EMS.
IEC 62888-6 – Requirements for purposes other than billing
The scope of IEC 62888-6 is to specify the requirements for EMS to be used for
benchmarking, daily energy consumption monitoring, technical research and development.
This part provides the requirements for monitoring consumed energy on-board in daily
services in an easy way and the measured data are applicable for general purposes in
industry such as energy management, energy saving, etc. However, this part is not applicable
for billing purposes.
EMS functional structure and dataflow
Figure 1 illustrates the functional structure of the EMS, the main sub-functions and the
structure of the dataflow and is informative only. Only the main interfaces required by this
standard are displayed by arrows.
Since the communication function is distributed throughout the EMS, it has been omitted for
clarity. Not all interfaces are shown.
Time Reference Source Other Systems
Settlement
Location Reference Source
System
Data Storage Function
Current Measurement Function
Voltage Measurement
Data
F ti
Data Compilation Function
Energy Calculation Function
Collection
Service
(DCS)
Energy Measurement Data Handling System
(DHS)
Function (EMF)
IEC 62888-3 (Data Handling)
IEC 62888-2 (Energy Measuring)
Energy Measurement System
IEC 62888-1 (General), IEC 62888-4 (Communication ), IEC 62888-5 (Conformance test),
IEC 62888-6 (Requirements for purposes other than billing)
Other
Systems
On-board (Traction Unit)
On-ground
IEC
Figure 1 – EMS functional structure and dataflow diagram
– 10 – IEC 62888-6:2019 © IEC 2019
RAILWAY APPLICATIONS –
ENERGY MEASUREMENT ON BOARD TRAINS –
Part 6: Requirements for purposes other than billing
1 Scope
This part of IEC 62888 specifies the specific requirements for EMS to be used for
benchmarking, daily energy consumption monitoring, technical research and development.
This document provides the requirements for monitoring consumed energy on board in daily
services in an easy way and the measured data are applicable for general purposes in
industry such as energy management, energy saving, etc. However, this document is not
applicable for billing purposes.
The practical purposes in industrial fields are, e.g.:
a) monitoring daily energy consumption of vehicles;
b) obtaining data on influential factors, such as operational commands and surrounding
conditions, in order to analyse relations between operations and energy;
c) energy management of power flow between vehicles and fixed installations;
d) implementing investigation tests of research and development for vehicle systems;
e) energy cost forecasting for analysing overall efficiency and consumption.
The requirements specified in this document supplement and/or amend the requirements
specified in IEC 62888-1 to IEC 62888-5.
The energy measurement system (EMS) is categorized in 3 Levels as described in
IEC 62888-1:2018, Table 1. This document applies to Level 2 and Level 3.
In this document unless levels are specially mentioned, both Level 2 and Level 3 apply. If a
requirement applies only to one level between Level 2 and Level 3, this condition is clearly
specified.
In the following clauses and subclauses square brackets, e.g. [IEC 62888-3:2018, 4.6.1] in
the title indicate relevant clauses and subclauses of other parts.
When lower subclauses of other parts are not listed, provisions of higher subclauses apply to
the lower subclauses.
Table 1 – Levels of performance [IEC 62888-1:2018, Table 1]
Levels Description Notes
Level 1 Level for measuring energy consumption on board for This is the only level applicable for
applications like energy management, energy saving, billing billing
and others.
Level 2 Level for measuring energy consumption on board for Level 2 is applied when accuracy
applications like energy management, energy saving, requirements need to be raised to
benchmarking by suppliers or train operators and others. ones equivalent to Level 1 by
This level is not applicable for billing. agreement by the Parties for
international comparison or
benchmarking purposes.
Level 3 Level for daily energy measurement, for instance: technical – Based on users requests.
research and development. This level is not applicable for
– Both measuring performance
billing.
and service conditions can be
less severe than Level 1.
Power and energy are calculated
based on voltage and current data
acquired from existing sensors
installed in converter systems, etc.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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 60044-8, Instrument transformers – Part 8: Electronic current transformers
IEC 60850:2014, Railway applications – Supply voltages of traction systems
IEC 61287-1, Railway applications – Power converters installed on board rolling stock –
Part 1: Characteristics and test methods
IEC 62236-3-2, Railway applications – Electromagnetic compatibility – Part 3-2: Rolling stock
– Apparatus
IEC 62313:2009, Railway applications – Power supply and rolling stock – Technical criteria for
the coordination between power supply (substation) and rolling stock
IEC 62497-1, Railway applications – Insulation coordination – Part 1: Basic requirements –
Clearances and creepage distances for all electrical and electronic equipment
IEC 62625-1, Electronic railway equipment – On board driving data recording system – Part 1:
System specification
IEC 62888-1:2018, Railway applications – Energy measurement on board trains – Part 1:
General
IEC 62888-2:2018, Railway applications – Energy measurement on board trains – Part 2:
Energy measurement
IEC 62888-3:2018, Railway applications – Energy measurement on board trains – Part 3:
Data handling
– 12 – IEC 62888-6:2019 © IEC 2019
IEC 62888-4:2018, Railway applications – Energy measurement on board trains – Part 4:
Communication
IEC 62888-5:2018, Railway applications – Energy measurement on board trains – Part 5:
Conformance test
3 Terms, definitions, abbreviated terms and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62888 (all parts)
and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
involved party
entity that is involved in designing, manufacturing, supplying and/or using the EMS or parts/
components of the EMS
Note 1 to entry: Involved party can be a purchaser, supplier, manufacturer or user. Members of involved parties
do not necessarily consist of all of them. Members of the involved parties depend on the provisions of subclauses
in this document and are appropriately interpreted.
3.2 Abbreviated terms
CEMD Compiled Energy Measured Data
CL Contact Line
CMF Current Measurement Function
DCS Data Collection Service
DHS Data Handling System
DSI Data Handling System to service Interface
ECF Energy Calculation Function
EMDI EMF to DHS Interface
EMF Energy Measurement Function
EMS Energy Measurement System
ESI Energy Measuring Function to service Interface
MCF Mobile Communication Function
PF Power Factor
PICS Protocol Implementation Conformity Statement
PIXIT Protocol Implementation Extra Information for Testing
RAMS Reliability, Availability, Maintainability and Safety
TCN Train Communication Network
TRP Time Reference Period
UTC Coordinated Universal Time
VEI VMF/CMF to ECF interface
VMF Voltage Measurement Function
3.3 Symbols
f rated frequency
n
I rated continuous thermal current
CMF,cth
I rated dynamic current
CMF,dyn
I rated short-time thermal current
CMF,th
I rated primary current of the CMF
n,CMF
I rated primary current of the ECF
n,ECF
I rated primary current of the EMF
n,EMF
t response time
s,r
U highest non permanent voltage according to IEC 60850
max2
U highest long term overvoltage according to IEC 60850
max3
U lowest permanent voltage according to IEC 60850
min1
lowest non permanent voltage according to IEC 60850
U
min2
U rated primary voltage of the VMF
n,VMF
maximum percentage (ratio) error allowed in accordance with the selected
ε
CMF
accuracy class for the CMF
ε maximum percentage error allowed in accordance with the selected accuracy
ECF
class for the ECF
ε maximum percentage (ratio) error allowed in accordance with the selected
VMF
accuracy class for the VMF
4 Requirements
4.1 General
4.1.1 Overview
The requirements specified in this document apply only in applications not related to billing.
These requirements supplement and/or amend the requirements specified in IEC 62888-1 to
IEC 62888-5. Individual permissions and requirements applicable to Level 2 and Level 3 are
specified in this document. Clauses not mentioned in this document are covered by
IEC 62888-1 to IEC 62888-5.
The differences between Level 1, Level 2 and Level 3 are summarized in Annex C.
4.1.2 Applications and usage
At present the traction equipment and the auxiliary equipment onboard are mainly controlled
by microcomputers installed in the control units. These equipments are equipped with voltage
and current sensors. They can calculate energy using these data.
Using these existing infrastructures can make a convenient energy measurement system on
board.
The data obtained by these systems may be used in applications other than billing purposes.
For these various purposes EMS functions may be different from Level 1.
Level 2 is applied to the following applications:
– 14 – IEC 62888-6:2019 © IEC 2019
Level 2 is the level for measuring energy consumption on board for applications like energy
management, energy saving, benchmarking by suppliers or train operators and others. This
level is not applicable for billing.
Level 2 is applied when accuracy requirements need to be raised to ones equivalent to
Level 1 by agreement between the involved parties for international comparison or
benchmarking purposes.
For instance, energy measurement in Level 2 is applied to the following cases:
• evaluation and comparison of energy consumption of trains among different railway
operators;
• evaluation and comparison of energy consumption of trains measured by different parties;
• annual technical report or statistics on energy consumption of trains; and
• evaluation of achievement of technical development of new trains.
Level 3 is applied to the following applications:
On board and board to ground communication networks also become very common and
various data can be transferred on the transmission line. This network communicates with the
traction equipment and the auxiliary equipment and transfers various data, which can include
the voltage, the current and the energy data calculated.
For instance, energy measurement in Level 3 is applied to the following cases:
• internal evaluation of energy consumption of trains in a railway operator;
• pursuit of long term variation of energy consumption of a train;
• evaluation of energy consumption differences depending on different train operation
methods;
• display of energy consumption for train drivers in order to assist their energy-saving
operation effort;
• accumulation of fundamental energy data for technical development of smart automatic
train operation;
• data acquisition for evaluation and improvement of train operation skill;
• acquisition of "Big Data" for train operation assisting system;
• acquisition of relevant energy factor for comprehensive evaluation of train operational
skill; and
• statistic analysis of energy consumption trend based on the "Big Data".
4.1.3 Measurement system configuration
For allocating EMS to on board devices, the following system configurations are possible:
• allocating EMF ( VMF, CMF and ECF) to separated devices from DHS;
• allocating VMF, CMF and ECF to separate devices or installing them in separate
equipment;
• implementing ECF and DHS in same device;
• allocating ECF to on ground DCS (e.g. for research in laboratories).
As stated in 4.1.2, the communication function is distributed throughout the EMS. The
obtained data may be not always transferred through the communication networks. On board
data can be transferred to ground via data storage media (e.g. removable disk or memory
devices) or data download system.
In Annex A (informative), some examples of the systems are presented.
4.1.4 Data to be acquired
The data handled in EMS shall be all or part of the following:
• time data;
• energy data (energy value, or voltage data and current data);
• location data;
and separate recording is accepted, e.g.:
• (time data, energy data);
• (time data, location data).
Measures for matching separate data shall be provided, e.g. time data.
4.2 Requirement amendments to IEC 62888-1
4.2.1 General [IEC 62888-1:2018, 4.1]
The general requirements in IEC 62888-1:2018, 4.1 are applicable to Level 2 and Level 3.
4.2.2 System level requirements [IEC 62888-1:2018, 4.2]
4.2.2.1 General [IEC 62888-1:2018, 4.2.1]
IEC 62888-1:2018, 4.2.1 is applicable to Level 2 and Level 3.
4.2.2.2 Accuracy [IEC 62888-1:2018, 4.2.2]
IEC 62888-1:2018, 4.2.2 is applicable to Level 2 and Level 3.
4.2.2.3 EMS operation and power supply [IEC 62888-1:2018, 4.2.3]
IEC 62888-1:2018, 4.2.3 is applicable to Level 2 and Level 3.
4.2.2.4 EMS measuring input [IEC 62888-1:2018, 4.2.4]
4.2.2.4.1 Installation point of the VMF and CMF [IEC 62888-1:2018, 4.2.4.1]
IEC 62888-1:2018, 4.2.4.1 is applicable to Level 2 and Level 3 with the following amendments.
Measuring points and methods of summation and any other constraints (e.g. losses, wiring,
cabling) derived by the actual configuration of the system shall be agreed upon by the
involved parties and documented.
Measured data are voltage, current, energy.
The reactive energy should be recorded by agreement between the involved parties.
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