On-board Energy Metering for Billing PurposesMetering for Billing Purposes Synopsis ... system which provides data suitable for subsequent use in the billing system ... On-board Energy

Railway Group Standard

GM/RT2132

Issue One

Date September 2010

On-board Energy Metering for Billing Purposes

Synopsis

This document sets out the energy metering requirements when electric traction units are fitted with an energy measuring system that provides data to be used by the infrastructure manager for billing purposes.

This document contains one or more pages which contain colour

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RSSB Members are granted copyright licence in accordance with the Constitution Agreement relating to Rail Safety and Standards Board Limited.

In circumstances where Rail Safety and Standards Board Limited has granted a particular person or organisation permission to copy extracts from Railway Group Standards, Rail Safety and Standards Board Limited accepts no responsibility for, and excludes all liability in connection with, the use of such extracts, or any claims arising therefrom. This disclaimer applies to all forms of media in which extracts from Railway Group Standards may be reproduced.

Published by: RSSB Block 2 Angel Square 1 Torrens Street London EC1V 1NY © Copyright 2010 Rail Safety and Standards Board Limited

Uncontrolled When Printed Document comes into force 04/12/2010

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GM/RT2132

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Issue record

Issue Date Comments

One September 2010 Original document

Superseded documents

This Railway Group Standard does not supersede any other Railway Group documents.

Supply

The authoritative version of this document is available at www.rgsonline.co.uk. Uncontrolled copies of this document can be obtained from Communications, RSSB, Block 2, Angel Square, 1 Torrens Street, London EC1V 1NY, telephone 020 3142 5400 or e-mail [email protected]. Other Standards and associated documents can also be viewed at www.rgsonline.co.uk.


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Contents

Section Description Page

Part 1 Purpose and Introduction 4 1.1 Purpose 4 1.2 Introduction 4 1.3 Approval and authorisation of this document 4

Part 2 Requirements for an On-board Energy Measuring System 5 2.1 On-board energy measuring system 5 2.2 Energy measuring function 5 2.3 Data handling system 7 2.4 On-board location function 8 2.5 Data transfer - on-board to ground 8 2.6 Communication service - on-board to ground 9 2.7 On-ground data collection service 10

Part 3 Conformity Assessment of the On-board Energy Measurement System 11

3.1 Conformity assessment procedure for the on-board energy measuring system 11

Part 4 Application of this document 12 4.1 Application - infrastructure managers 12 4.2 Application - railway undertakings 12 4.3 Health and safety responsibilities 12 Appendices Appendix A Record and Data Formats 13 Appendix B Recommendations on the Additional Error resulting from Influence

Quantities and Temperature Variation 16 Appendix C Arrangement for Metering Points on 3rd Rail 750 V d.c. Rail Vehicles 19 Appendix D Energy Measuring System Overview 20 Definitions 21 References 24 Tables Table A.1 Compiled data record transmission file format 14 Table B.1 Influence quantities for voltage measurement function 16 Table B.2 Influence quantities for current measurement function 16 Table B.3 Temperature coefficient for the energy calculation function 17 Table B.4 Influence quantities for the energy calculation function 18 Figures Figure C.1 Typical arrangement for metering points on traction units using the

750 V d.c. traction system 19 Figure D.1 Energy measuring system 20


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Part 1 Purpose and Introduction

1.1 Purpose

1.1.1 This document sets out the energy metering and data handling requirements for electric traction units when fitted with an energy measuring system.

1.1.2 The on-board energy measuring system will provide (via a on-ground data collection service) data to be used by the infrastructure manager to produce a bill which is invoiced to the railway undertakings.

1.2 Introduction 1.2.1 Background

1.2.1.1 Track access contracts will be amended to allow for billing on the basis of metered readings. In support of this, the Office of Rail Regulation (ORR) determined that metered billing for traction energy electricity must be facilitated by Network Rail. Whilst other specifications / standards are being developed (the Conventional Rail Locomotives and Passenger TSI (CR LOC & PAS TSI) [draft version 4.0] and revised version of BS EN 50463:2007) they are not anticipated to be available until circa 2011/2 and are primarily focussed on new rolling stock entering service.

1.2.1.2 This document facilitates early adoption of the on-board energy measuring system which provides data suitable for subsequent use in the billing system prior to the publication of the CR LOC & PAS TSI and ongoing work to produce a revised issue of BS EN 50463:2007. In addition, this document will also be needed once the TSI is in force, to address:

a) Those vehicles not covered by the TSI.

b) Associated aspects falling outside the TSI’s scope such as the transfer of data from on-board systems to on-ground systems.

1.2.1.3 An on-board energy measuring system fitted to a traction unit measures the energy taken from / returned (during regenerative braking) to the contact line. It is specifically used to acquire energy data suitable for billing purposes.

1.2.2 Principles

1.2.2.1 The requirements set out in this document are based on the CR LOC & PAS TSI [draft version 4.0] and ongoing work to produce a revised issue of BS EN 50463:2007.

1.2.2.2 This document sets out those requirements that involve cooperation between railway undertakings and infrastructure managers in order to enable data from an on-board energy measuring system to be used when participating in the billing system.

1.3 Approval and authorisation of this document

1.3.1 The content of this document was approved by Rolling Stock Standards Committee on 30 June 2010.

1.3.2 This document was authorised by RSSB on 20 July 2010.


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Part 2 Requirements for an On-board Energy Measuring System

2.1 On-board energy measuring system

2.1.1 The energy measuring system shall consist of:

a) An energy measurement function that includes:

i) Voltage and current measurement.

ii) Calculation of energy consumed (and where applicable regenerated).

b) A data handling system that compiles data from the energy measuring function with time data and geographical position, producing and storing the complete series of data with true energy values (in kWh / kvarh) ready to be sent by a communication service.

c) An on-board location function, that gives geographical position of the traction unit.

d) An on-board to ground communications service that supports the transfer of compiled data suitable for billing purposes.

2.1.2 It is permissible for the functions set out in 2.1.1 to be performed by individual devices or combined into one or more integrated assemblies. Devices provided for other purposes may be used (within the energy measuring system), provided that compliance with the requirements of this standard are achieved.

2.1.3 The on-board energy measuring system and associated on-ground aspects are shown in Appendix D.

2.1.4 The requirements for recording the fitment of an energy measuring system to a traction unit in the rolling stock register are set out in GM/RT2453 issue two, currently in draft.

2.2 Energy measuring function

2.2.1 The energy measuring function (EMF) shall measure all the energy consumed from the contact line and, where applicable, the energy returned to the contact line during regeneration, when using any electric traction power supply system (overhead, third and fourth rail) for which the traction unit is designed.

2.2.2 The energy measuring function shall be connected in such a way that all energy (traction and auxiliary) supplied to the traction unit from the contact line and all energy returned to the contact line during regeneration is recorded. For a.c. on-board energy measuring systems the energy measuring function shall also have the capability of recording the reactive energy component.

2.2.3 The energy measuring function shall measure the energy if the primary current is equal to or greater than 0.4% of the rated primary current and the primary voltage is at the lowest non-permanent voltage (Umin2 as set out in BS EN 50163:2004 clause 4.1, Table 1, including special national conditions where applicable) or above. It is permissible for the on-board energy measurement measuring system to record a zero value when the primary current is below the minimum value and the energy measuring function ceases to measure.


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2.2.4 Guidance on the selection of suitable measuring points for traction units designed to operate using the 750 V d.c.traction power supply system is set out in Appendix C.

2.2.5 The energy measuring function shall have a total accuracy of at least:

a) 1.5% for a.c. for active energy.

b) 2.0% for d.c.

2.2.6 The accuracies of the energy measuring function set out in 2.2.5 shall be calculated in accordance with the following formula:

2ECF

2CMF

2VMFEMF

Where:

εEMF = Total accuracy of energy measuring function

εVMF = The maximum percentage error of the voltage measurement function

εCMF = The maximum percentage error of the current measurement function

εECF = The maximum percentage error of the energy calculation function

2.2.7 The maximum percentage errors of the individual functions set out in 2.2.6 shall be fulfilled under the following reference conditions:

a) Any voltage in between lowest permanent voltage Umin1 and highest non-permanent voltage Umax2, (with Umin1 and Umax2 as defined in BS EN 50163:2004 clause 4.1, Table 1).

b) Any current between 10% and 120% of the rated primary current of the energy measuring function.

c) Frequency 50 Hz ±0.3% (for a.c. measurement only).

d) Power factor between 0.85 and 1 (for a.c. measurement only).

e) Ambient temperature of 23°C ±2°C.

2.2.8 Those devices containing individual functions for voltage measurement, current measurement and energy calculation used to implement the energy measuring function shall be subject to metrological control. This shall be executed in accordance with the following:

a) The accuracy of each element shall be tested under the reference conditions set out in 2.2.7, to verify that they are within their declared maximum error.

b) Each element which complies with a) shall be marked, to indicate metrological control and the declared maximum error limit.

c) The configuration of each element shall be documented as a part of the metrological control.


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2.2.9 Recommendations on the additional error resulting from influence quantities and temperature variation are set out in Appendix B.

2.2.10 The energy measuring system rated current and voltage shall be matched to the traction units rated voltage and current. However, on d.c. electric traction units, if multiple measuring points are used (see Appendix C), the rated current of each measuring point shall be matched to its associated load.

2.2.11 The energy measuring function shall have a time reference period of 5 minutes defined by the UTC clock time at the end of each reference period. One of the time reference periods shall end each day at midnight (00:00:00). It is permitted to use a shorter time reference if the data can be aggregated into 5 minute reference periods.

2.2.12 The energy measuring function shall be protected from non-authorised access to the system and data for example by physical means or by software, such that the integrity of the data produced is not compromised.

2.3 Data handling system

2.3.1 The data handling system shall compile the measured energy data with the other data necessary to produce the compiled data without any data corruption.

2.3.2 The data handling system shall have the capability to respond to requests for compiled data from the on-ground data collection service.

2.3.3 The data handling system shall have the capability to transmit the compiled data to the data collection service within 24 hours, provided that the energy measuring system is energised from its power supply and the communications system is operational.

2.3.4 The data handling system shall use, as a time reference, the same source of clock as the energy measuring function.

2.3.5 The data handling system shall incorporate data storage with a memory capacity capable of storing the compiled data for at least 60 days (irrespective of the time reference period used) of continuous operation (work) and consisting of consumed / regenerated active and reactive (where appropriate) energy, together with the associated time reference and location data.

2.3.6 The data handling system shall have the capability to be interrogated locally by authorised personnel on board the traction unit using the appropriate equipment for example a laptop computer in order to provide:

a) An opportunity for audit.

b) An alternative method of extracting and recovering data.

c) A facility to enable maintenance and fault finding.

2.3.7 It is permissible to access / interrogate the data in the data handling system for other purposes, for example feedback to the driver in connection with the efficient operation of the train.

2.3.8 Access / interrogation of the data handling system shall not alter / corrupt any of the compiled data.


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2.3.9 The compiled data suitable for billing purposes shall be stored ready to be transferred (to the on-ground data collection service) in chronological order according to the end times of each 5 minute time reference period as set out in 2.2.11.

2.3.10 The compiled data shall consist of the following:

a) Unique 13 digit identification number which allows the traction unit and each associated on-board energy measuring system to be unambiguously identified. The format shall be 13 digits, where practicable comprising the 12 digit European Vehicle Number (EVN) (see GM/RT2453 issue two, currently in draft), plus one additional digit to identify each on-board energy measuring system used on the traction unit.

b) The end time of each elapsed time reference period for energy measurement, defined as year, month, day, hour, minute and second.

c) The on-board location data as set out in 2.4.2 at the end of each time reference period.

d) The consumed / regenerated active and reactive (where appropriate) energy in each time reference period.

2.3.11 The format of the compiled data and the associated quality flags shall be in accordance with Appendix A.

2.3.12 The compiled data set out in 2.3.9 shall be retained even when the energy measuring system is isolated from its power supply.

2.4 On-board location function

2.4.1 The data from the on-board location function shall be synchronized in accordance with UTC clock time and time reference period with the on-board energy measuring function (see 2.2.11).

2.4.2 The on-board location function shall provide the position expressed in latitude and longitude based on the World Geodetic System and given in decimal degrees.

2.4.3 In open air and where the on-board location function can receive a signal, it shall have an accuracy of 250 m or better.

2.5 Data transfer - on-board to ground

2.5.1 The compiled data set out in 2.3.9 shall be transmitted from the on-board data handling system to the on-ground based data collection service.

2.5.2 The compiled data record transmission format shall be in accordance with Appendix A.

2.5.3 It is permitted for other types of data to be transmitted from on-board to ground (for example this could be for energy management purposes). The transmission of other types of data shall not interfere with the transmission of the compiled data.

2.5.4 The compiled data shall be packed ready for transmission.


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2.5.5 All information necessary for the data collection service to unpack the compiled data without corruption and to store an authentic copy of the compiled data shall be made available to the data collection service administrator by the railway undertaking.

2.5.6 Information necessary to allow the data collection service to request compiled data from the data handling system shall be made available to the data collection service administrator by the railway undertaking. For example where the data collection service has missing or uncertain compiled data, the data collection service administrator needs to request this data from an on-board data handling system.

2.6 Communication service - on-board to ground

2.6.1 Transmission of the compiled data from the data handling system to the data collection service shall be via a wireless communications network available in the intended geographical area of operation for the traction unit. The communication networks used shall enable the transfer of the compiled data (initiated by either the on-board data handling system or the on-ground based data collection service) when the energy measurement system is in operational mode. The on-board communication service shall ensure that a secure channel is established which enables data exchange between the data handling system and its data collection service, and ensures the integrity of the transferred data is maintained. The following wireless bearers for example may be used:

a) IEEE802-11 a/b/g/n.

b) GSM, GSM-R (data)*.

c) GPRS.

d) EDGE.

e) UMTS.

* This bearer may be subject to constraints, therefore its suitability for a specific application should be considered before use.

2.6.2 The on-board communication service shall provide a connection to support the transfer of compiled data from the on-board data handling system to the on-ground based data collection service when the traction unit is in operational mode.

2.6.3 The on-board communication service shall:

a) Use and manage internet protocol addressing for example IPv4, IPv6.

b) Map between physical addressing and logical addressing.

c) Manage addresses and function discovery.


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2.6.4 The on-board energy measuring system address shall be unique and standardised. The following format is recommended:

EMSn.EVN.ns

Where:

EMS = On-board energy measuring system signifying that the function being addressed is the energy measurement system

n = The single digit number used to identify each on-board energy measuring system on a traction unit

EVN = 12 digit European Vehicle Number (if this is not practicable, use the unique identification number as set out in 2.3.10)

ns = Member state of the traction unit owner as set out in BS EN ISO 3166-1:1998.

2.7 On-ground data collection service

2.7.1 This section specifies basic functional requirements associated with the acquisition of compiled data. Other specific data collection service requirements for example physical, software data handling or other aspects are outside the scope of this document.

2.7.2 The data collection service shall have the capability to receive, read and store without corruption, the compiled data transmitted from an on-board energy measuring system complying with this document.

2.7.3 The data collection service shall have the capability to request compiled data from an on-board data handling system, for example when the compiled data for a particular time reference period stored in the on-board data collection service is incomplete.

2.7.4 The on-ground data collection service shall be unique and have a fully qualified domain name (FQDN). The following format is recommended:

GSF.owner.ns

Where:

GSF = The function identifier comprising three letters (on-ground data collection service for energy billing applications)

Owner = Six characters to identify the on-ground data collection service owner (administrator) of the on-ground server exchanging data with the on-board energy measuring function

ns = Member state of the on-ground data collection service owner.

2.7.5 The railway undertaking shall transfer validated data from the data collection service to the infrastructure manager.


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Part 3 Conformity Assessment of the On-board Energy Measurement System

3.1 Conformity assessment procedure for the on-board energy measuring system

3.1.1 An energy measuring system installed to meet the requirements of this document shall be assessed using the following procedures. The conformity assessment, which demonstrates compliance with this document, shall be completed prior to the first on-board energy measuring system of a given design being placed into use on a traction unit of a given design.

3.1.2 Conformity assessment of each design of an on-board energy measuring system and its application to a traction unit of a given design shall be assessed by a design review (including examination of design methods, design tools and the design results) and type test of the energy measuring system elements, including evidence of metrological control of the elements used to implement the on-board energy measuring function. The configuration of the on-board energy measuring system shall be documented as part of the conformity assessment.

3.1.3 The declared maximum error limit for each element of the on-board energy measuring function, verified in accordance with 2.2.8 a), shall be inserted in the formula set out in 2.2.6 to check that the total accuracy is within the stated limit.

3.1.4 If the compiled data in the on-board data handling system is accessed / interrogated for other purposes, see 2.3.7, it shall be demonstrated that the integrity of the recorded and transmitted compiled data set out 2.3.9 is not compromised.

3.1.5 The conformity assessment shall verify that a representative sample of compiled data can be transferred to ground and stored by the on-ground data collection service without corruption, and that the data transferred to the on-ground based system is identical to the corresponding compiled data stored in the data handling system of the on-board energy measuring system. It shall also verify that the same sample of compiled data can be recovered without corruption using local interrogation (see 2.3.6) and is identical to the corresponding compiled data stored in the on-board data handling system.


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Part 4 Application of this document

4.1 Application - infrastructure managers

4.1.1 There are no requirements applicable to infrastructure managers.

4.2 Application - railway undertakings 4.2.1 Scope

4.2.1.1 The requirements of this document, as set out in 2.1 to 2.7 apply to all new and existing traction units when they are fitted with an on-board energy measuring system intended to be used with the GB rail billing system.

4.2.1.2 Action to bring existing traction units into compliance with the requirements of this document is not required unless they are fitted with an on-board energy measuring system intended to be used with the GB rail billing system.

4.2.2 Exclusions from scope

4.2.2.1 The requirements in this document are not applicable to traction units that are not intended to use the GB rail billing system.

4.2.3 General compliance date for railway undertakings

4.2.3.1 This Railway Group Standard comes into force and is to be complied with from 04 December 2010, except as specified in 4.2.4.

4.2.3.2 After the compliance dates or the date by which compliance is achieved if earlier, railway undertakings are to maintain compliance with the requirements set out in this Railway Group Standard. Where it is considered not reasonably practicable to comply with the requirements, authorisation not to comply should be sought in accordance with the Railway Group Standards Code.

4.2.4 Exceptions to general compliance date

4.2.4.1 There are no exceptions to the general compliance date specified in 4.2.3 for railway undertakings.

4.3 Health and safety responsibilities

4.3.1 Users of documents published by RSSB are reminded of the need to consider their own responsibilities to ensure health and safety at work and their own duties under health and safety legislation. RSSB does not warrant that compliance with all or any documents published by RSSB is sufficient in itself to ensure safe systems of work or operation or to satisfy such responsibilities or duties.


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Appendix A Record and Data Formats

The content of this appendix is mandatory and specifies the requirements related to the format and transfer of the compiled data from the on-board data handling system to the on-ground data collection service.

A.1 Compiled data record transmission format A.1.1 The compiled data relevant to each reference period shall be retrieved from the

data handling system memory. The compiled data is used to prepare the records to be transferred as a compiled data file of 128 records.

Note:

a) The choice of a compiled data file size of 128 records is a trade-off between file length and transmission duration. This allows data to be transmitted with each file covering approximately 12 hours of recorded data; consequently approximately two files are transferred per day.

b) Compiled data is not manipulated, only casting operations (to organise the stored data payload along with accompanying information into the record format ready for transmission to ground) are performed.

A.1.2 After preparing the compiled data file of 128 records in the transmission buffer (including their application cyclic redundancy check (CRC) as the last field of each record) and prior to data file transmission, the compiled data in each record shall be verified against the corresponding compiled data stored in the data handling system's memory.

Note: The red text in Table A.1 indicates optional data for those on-board energy measuring systems on dual voltage traction units capable of providing energy consumption and regeneration data separately for each of the traction power supply system. For example, energy data associated with the 25 kV a.c. system would be recorded as ‘Channel A’ and energy data associated with the 750 V d.c.system would be recorded as ‘Channel B’.


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Data type

Data id

Short description

WORD Label label to identify the starting of the record

WORD Emsid Unique identification number of EMS / traction unit (13 digit number)

DWORD Key Binary value to identify the record number

DWORD Tm End time of the measurement time reference period (YYYYMMDDHHMMSS)

DWORD Lat Latitude at the end of the measurement time reference period (± DD.XXXXX)

DWORD Lon Longitude at the end of the measurement time reference period (± DDD.XXXXX)

DWORD EcaA Channel A Consumed Active Energy delta value (kWh dot decimal)

DWORD EraA Channel A Regenerated Active Energy delta value (kWh dot decimal)

DWORD EcrA Channel A Consumed Reactive Energy delta value (kvarh dot decimal)

DWORD ErrA Channel A Regenerated Reactive Energy delta value (kvarh dot decimal)

DWORD FlageA Channel A Energy data quality flag

DWORD FlaglA Channel A Location data quality flag

DWORD FlagtA Channel A Time data quality flag

DWORD EcaB Channel B Consumed Active Energy delta value (kWh dot decimal)

DWORD EraB Channel B Regenerated Active Energy delta value (kWh dot decimal)

DWORD EcrB Channel B Consumed Reactive Energy delta value (kvarh dot decimal)

DWORD ErrB Channel B Regenerated Reactive Energy delta value (kvarh dot decimal)

DWORD FlageB Channel B Energy data quality flag

DWORD FlaglB Channel B Location data quality flag

DWORD FlagtB Channel B Time data quality flag

WORD CRC16 Application CRC16

Table A.1 Compiled data record transmission file format

A.1.3 The fields in the compiled data record file format detailed in Table A.1 are ASCII coded. Fields that are not available according to the hardware and software configuration are filled with a string of one’s (1111111) to indicate that the field is void.

A.2 Data format and quality flags A.2.1 The stored compiled data suitable for energy billing ready to be transferred shall

use the following formats and quality flags:

a) Unique 13 digit identification number comprising of the 12 digit European Vehicle Number followed by one digit to uniquely identify each individual energy measuring system installed on the traction unit. (If this is not practicable, use the unique identification number as set out in 2.3.10. Any unique number less than 13 digits is to be prefixed by zeros to create a string of 13 digits).


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b) The end time of each elapsed measuring period for energy, comprising year, month, day, hour, minute and second in the format:

YYYYMMDDHHMMSS

c) The on-board location data giving the position, expressed in latitude and longitude based on the World Geodetic System and given in decimal degrees in the format:

latitude ± DD.XXXXX where positive values are North, negative values are South.

longitude ± DDD.XXXXX positive values are East, negative values are West.

d) The consumed / regenerated active energy in kWh and reactive energy in kvarh (where appropriate) in each time reference period shall be rounded to one decimal place. In rounding to one decimal place no energy shall be lost. It is permissible for energy data associated with rounding to be transferred into an adjacent time reference period.

A.2.2 The compiled data shall be accompanied by the following data quality and status flags using, where indicated, the specified ebIX code:

a) Energy data quality:

i) Measured code 127

ii) Uncertain code 61

iii) Non-existent code 46

b) Location data quality:

i) Measured code 127

ii) Estimated code 56

iii) Uncertain code 61

iv) Non-existent code 46

c) Time data flag:

i) If any change is made to the on-board time reference clock which affects the UTC clock time referencing (for example because of manual adjustment, a discrepancy of more than 2 seconds due to drift, or a corruption of the time data), the time reference period during which the change is made shall be flagged to indicate a timekeeping adjustment has occurred.

ii) The time shall be accurate to ±2 seconds.


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Appendix B Recommendations on the Additional Error resulting from Influence Quantities and Temperature Variation

The content of this appendix is not mandatory and is provided for guidance only.

B.1 Voltage measurement function - limits of additional error due to influence quantities B.1.1 Where ambient temperature variations can contribute additional error, the voltage

measurement function should have a temperature coefficient which does not exceed the value set out in Table B.1.

Value of voltage System type

Voltage measurement function temperature coefficient [%/K]

Ambient temperature variation (main range)

-10°C to +50°C (+60°C for indoor)

Ambient temperature variation (extended range)

-40°C to -10°C

and

+60°C to +75°C (for indoor)

Umin1 ≤ U ≤ Umax2 a.c. and d.c. 0.01 0.02

Table B.1 Influence quantities for voltage measurement function

Note 1: The values of Umin1 and Umax2 are as set out in BS EN 50163:2004 clause 4.1, Table 1.

B.1.2 Tests of the temperature coefficient should be carried out only in the selected temperature class range.

B.2 Current measurement function - limits of additional error due to influence quantities B.2.1 Where ambient temperature variations can contribute additional error, the current

measurement function should have a temperature coefficient which does not exceed the value set out in Table B.2.

Value of current System type

Current measurement function temperature coefficient [%/K]




-40°C to -10°C and


0.1 In ≤ I ≤ 1.2 In a.c. and d.c. 0.01 0.02

0.05 In ≤ I < 0.1 In a.c. and d.c. 0.02 0.04

0.01 In ≤ I < 0.05 In a.c. and d.c. 0.1 0.2

Table B.2 Influence quantities for current measurement function

Note 1: In is the rated primary current (In.EMF) of the energy measuring function.

B.2.2 Tests of the temperature coefficient should be carried out only in the selected temperature class range.


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B.3 Energy calculation function - limits of additional error B.3.1 Energy calculation function limits of additional error due to ambient temperature

variation

B.3.1.1 The mean temperature coefficient for the percentage error of the energy calculation function should not exceed the limits set out in Table B.3.

Value of current Value of voltage

System type

Energy calculation function temperature coefficient [%/K]




-40°C to -10°C and


0.1 In ≤ I ≤ 1.2 In

and Umin1 ≤ U ≤ Umax2 a.c. and d.c. 0.01 0.02

0.01 In ≤ I < 0.1 In

and Umin1 ≤ U ≤ Umax2

and

Umin2 ≤ U < Umin1

and 0.1 In ≤ I ≤ 1.2 In

a.c. and d.c. 0.02 0.04

Table B.3 Temperature coefficient for the energy calculation function

Note 1: In is the rated primary current (In.EMF) of the energy measuring function.

Note 2: The values of Umin2, Umin1 and Umax2 are as set out in BS EN 50163:2004 clause 4.1, Table 1.

B.3.1.2 Tests of the temperature coefficient should be carried out only in the selected temperature class range.


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B.3.2 Limits of additional error due to influence quantities

B.3.2.1 The limit of variation of error due to the change in an influence quantity with respect to reference conditions should not exceed the limits set out in Table B.4.

Influence quantity

Specified measuring range

Phase influence function Additional percentage error limits for a energy calculation function

Value of current 1) Power factorsin j inductive or capacitive

Auxiliary voltage variation -30%, +25%

and

±10% 0.01 In ≤ I ≤ 1.2 In 1 1

±1.0*N4)

and

±0.4*N4) (only for an energy calculation function with an auxiliary supply)

Frequency variation

50 Hz +2%, -2% 2) 3)

as set out in BS EN 50163:2004 clause 4.2

0.01 In ≤ I ≤ 1.2 In 1 1 ±0.5*N4)

Harmonic components in the current and voltage circuits 0.5 In 1 Not applicable ±1.0*N4)

Odd harmonics in the current circuit 2) 0.5 In 1 1 ±3.0*N4)

Sub-harmonics in the current circuit 2) 0.5 In 1 1 ±3.0*N4)

Continuous magnetic induction of external origin - d.c. field with 0.5 mT In 1 1 ±2.0*N4)

Magnetic induction of external origin

- 2 mT for an energy calculation function intended to be mounted in close proximity to high magnetic fields (B > 0.5 mT)

- 0.5 mT for an energy calculation function intended to be mounted in less harsh magnetic environment (B ≤ 0.5 mT)

In 1 1 ±2.0*N4)

Electromagnetic RF fields In 1 1 ±2.0*N4)

Table B.4 Influence quantities for the energy calculation function

Note 1: In is the rated primary current of the energy measuring function.

Note 2: This does not apply to energy calculation functions when measuring d.c.

Note 3: In practice, the variation of frequency is more closely controlled in Europe than the maximum frequency variations stated in BS EN 50163:2004 clause 4.2. Traction units will operate only within the frequency tolerances for 25 kV / 50 Hz range from 49 Hz to 51 Hz. If the frequency is out of this range, the traction unit’s performance may be reduced or the traction unit drives should be disconnected.

Note 4: N is the maximum percentage error of the energy calculation function as set out in 2.2.6 and 2.2.7.


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Appendix C Arrangement for Metering Points on 3rd Rail 750 V d.c. Rail Vehicles

The content of this appendix is not mandatory and is provided for guidance only.

C.1 Typical arrangement for metering points on 3rd Rail 750 V d.c. rail vehicles C.1.1 It is recommended that traction units designed to operate using the 750 V d.c.

traction system should measure from metering points that are the main feeds into the traction and auxiliaries on the train. Figure C.1 shows a typical arrangement showing four metering points on a train. By measuring at the take off points from the busline rather than the shoe currents, this excludes the current that flows through the train from being measured. It should also be noted that if measurement is to be undertaken at the shoe gear the presence of any busline current flowing through the train should not degrade the accuracy of the energy measurement function.

Figure C.1 Typical arrangement for metering points on traction units using the

750 V d.c. traction system


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Appendix D Energy Measuring System Overview

D.1 Energy measuring system overview

Note: The TSI scope limit (shown in blue) in Figure D.1 is based on the expected coverage of the forthcoming CR LOC & PAS TSI [draft version 4.0].

Figure D.1 Energy measuring system

Current measurement function

Energy calculation function

Data handling system

UTC time source

Data collection service administrator

Communications system

Location data source

Energy measurement system

EMF

On-board

On-ground

Infrastructure manager data processing and billing

RG

S

scope lim

it

Local data access

Bill based on energy measuring system data

Voltage measurement function

TS

I scope lim

it

Communications system


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Definitions

Authorised personnel

Personnel authorised in accordance with the appropriate procedures to access and interrogate the data handling system.

Communication service

The wireless communication system which is used to transfer the compiled data from the on-board energy measuring system to the data collection service on ground.

Compiled data

A defined data set produced by the on-board energy measuring system and transferred to ground for subsequent use in a billing system.

Consumed active energy (kWh)

Active energy taken from the contact line by the traction unit on which the energy measuring system is installed.

Consumed reactive energy (kvarh)

Reactive energy taken from the contact line by the traction unit on which the energy measuring system is installed.

Contact line

Conductor system for supplying traction units with electrical energy via current-collection equipment, as defined in BS EN 50119:2009.

Current measurement function

A function which measures the current taken from and returned to the contact line by the traction unit.

Design review

An assessment of the adequacy of the technical design of the energy measuring system through examination of technical documentation and any supporting evidence.

ebIX (code) (see UIC 930 leaflet Appendix A)

A code defined by the European forum for Energy Business Information eXchange (ebIX) and used within the energy industry to standardise electronic information exchange.

Energy delta value

A quantity of energy (consumed or regenerated) during a time reference period.

Energy measuring system

The system intended for measurement of the electric energy taken from and return (during regenerative braking) to the contact line by a traction unit. The system also provides the compiled data to an on-ground based data collection service for billing purposes.

GB rail billing system

The system used to produce an invoiced bill based on electric energy consumed by a traction unit.

Highest non-permanent voltage (Umax2)

Maximum value of the voltage likely to be present as highest non-permanent voltage for a limited period of time, as defined in BS EN 50163:2004.


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Highest permanent voltage (Umax1)

Maximum value of the voltage likely to be present indefinitely, as defined in BS EN 50163:2004.

Influence quantities

A condition, generally external to a device containing any function of the energy measuring function, which may affect its metrological performance.

Internet protocol

The basic communication language or protocol of the Internet.

Logical addressing

The address used to identify a function within an item or device.

Lowest non-permanent voltage (Umin2)

Minimum value of the voltage likely to be present for a limited period of time, as defined in BS EN 50163:2004.

Lowest permanent voltage (Umin1)

Minimum value of voltage likely to be present indefinitely, as defined in BS EN 50163:2004.

Metrological control

Metrological control ensures the accuracy and reliability of measurement, where measured values (produced by devices implementing the energy measuring function) can affect the transparency of financial transactions.

Non-authorised access

Access to any part of the energy measuring system and the associated data by an entity not having the authorisation to do so.

On-ground data collection service

On-ground service capable of collecting the compiled data from the on-board energy measuring system.

Physical addressing

The address used to identify a unique item or device.

Regenerated active energy (kWh)

The active energy fed back into the contact line during regeneration by the traction unit on which the energy measuring system is installed.

Regenerated reactive energy (kvarh)

The reactive energy fed back into the contact line during regeneration by the traction unit on which the energy measuring system is installed.

Temperature coefficient

The ratio of variation of the percentage error to the change of temperature which produces this variation.

Time reference period

Period over which energy billing data is produced.


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Total accuracy

The total accuracy (of the energy measuring function) is expressed in terms of the maximum allowable percentage error (for example ±1.5%). The accuracy is determined by calculation, and is derived from the maximum error of the voltage measurement function, the current measurement function and the energy calculation function, when tested under the specified reference conditions. See 2.2.5, 2.2.6 and 2.2.7 for further information.

Traction unit

A vehicle or consist of vehicles in fixed formation, for which the energy taken from and / or returned to the contact line is to be measured by an on-board energy measuring system.

Type test

Conformity assessment test carried out to verify that an on-board energy measuring system of a given design meets the requirements of this document.

UTC clock time

A time scale which forms the basis of a coordinated radio dissemination of standard time signals. It corresponds exactly in rate with international atomic time, but differs from it by an integral number of seconds.

Note 1: Coordinated universal time is established by the International Bureau of Weights and Measures (BIPM) and the International Earth Rotation Service (IERS).

Note 2: The UTC clock time source is adjusted by the insertion or deletion of seconds, so called positive or negative leap seconds, to ensure approximate agreement with UT1.

World Geodetic System

A consistent set of parameters describing the size and shape of the Earth, the positions of a network of points with respect to the centre of mass of the Earth, transformations from major geodetic datums, and the potential of the Earth (usually in terms of harmonic coefficients).


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References

The Catalogue of Railway Group Standards and the Railway Group Standards CD-ROM give the current issue number and status of documents published by RSSB. This information is also available from www.rgsonline.co.uk.

Documents referenced in the text RGSC 03 The Railway Group Standards Code

Railway Group Standards

GM/RT2453 issue two Process for Registration, Identification and Data to be [currently in draft] Displayed on Rail Vehicles

Other references

BS EN 50163:2004 Railway applications – Supply voltages of traction systems

BS EN 50463:2007 Railway applications – Energy measurement on board trains

BS EN 50119:2009 Railway applications - Fixed installations - Electric traction overhead contact lines

CR LOC & PAS TSI Conventional Rail Locomotives and Passenger Rolling Stock TSI (IU-RST-24-11-2009-TSI draft version 4.0)

UIC 930 Exchange of data for cross-border railway energy settlement.

1st edition, September 2009.

BS EN ISO 3166-1:1998 Codes for the representation of names of countires and their subdivisions. Country codes.
