Kontaktledning/RTU

Fagområde / Discipline	Kontaktledning og banestrømforsyning
Tilhører rammeavtale / Frame agreement	XXXX
Fagansvarlig / Responsible	Banestrømforsyning: Steinar Danielsen Kontaktledning: Bjørn Ivar Olsen
Godkjent av / Approved	Knut Darre Christiansen
Revisjon / Revision	0
Utgitt / Published	22.11.2021

1 Scope

The scope of this technical specification is remote terminal units (RTUs) for remote control of overhead contact line switching devices, for use with frame agreements. The specification covers RTUs for the following applications:

1. Concept 1: RTU for control of two switching devices, mounted outdoors in an enclosure. The enclosure is not part of this contract.
2. Concept 2: RTU for control of an arbitrary number of switching devices:
   • for indoor or outdoor installation,
   • including enclosure, for indoor or outdoor installation,
   • including enclosure and power supply, for indoor or outdoor installation.

This is a new technical specification (2021). In this specification, functional requirements and interfaces are specified. Detailed solutions and internal design of equipment in accordance with the functional and interface requirements in accordance with this specification are the responsibility of the supplier. The required list of compliance or non-compliance to this technical specification is intended to show the customer how the technical requirements are fulfilled.

NOTE: There is a appendix asking for information on RTU function extendability not part of the evaluation for this frame agreement.

2 Functional requirements

2.1 General requirements

a) Signalling range: The required number of signals for remote control of each overhead contact line switching device shall be two binary outputs and two binary inputs as follows:

• Command "out" (binary output)
• Command "in" (binary output)
• Indication "out" (binary input)
• Indication "in" (binary input)

Additional binary inputs (see specification for each RTU type below) shall be available for each delivered RTU unit. These will normally be assigned to supply voltage and fuse supervision, and cabinet door supervision, or for possible future position indication of switching devices’ LOCAL/REMOTE control switch.

b) Service life: The supplier shall state the design service life of the offered RTU. The statement shall include:

1. The number of years the RTU is designed for, given that environmental and electrical parameters the RTU is exposed to are within the ranges stated in the required standards.
2. Which factors will limit the expected service life.
3. Which parts must be expected to be changed during the rated service life. Failure modes shall be specified and failure rates (or mean time between failures, MTBF) shall be specified by the supplier, together with factors that may influence the failure rate (MTBF) for these failure modes.

c) Investigation of malfunction: The supplier shall investigate the reason for each reported case of malfunction of a delivered unit where the malfunction has occurred less than 3 years after delivery. An investigation report shall be delivered to the customer.

d) Power supply and communications network interruption: After interruption of the power supply and/or communications network connection the RTU shall automatically start operating correctly with the same settings as before the interruption.

e) Function reliability: During startup, power supply interruption, network interruption, and other fault conditions, the output contacts shall not be able to change position. Command outputs shall only change position when a command is received from the SCADA system.

f) Execution time: The design execution time for the RTU shall be lower than 1 second. The execution time is the time from:

• RTU receives a command on the remote interface to the change of position of the corresponding output contact.
• RTU detects a change of position in input contact to RTU sends a corresponding indication to the remote interface.
• RTU receives a request for status update on the remote interface to status message is returned.

There will not be verification procedures connected with this requirement, but the customer may follow it up if it is experienced that the time is significantly longer than required.

g) Local HMI: Local human machine interface (HMI) for controlling the switch(es) on the RTU is undesired as these switches are normally locally controlled by push-buttons on the switching devices’ operating mechanism. If an HMI exists, it shall be possible to disable via configuration.

2.2 Environmental conditions

a) Environmental conditions: The RTU shall be designed for environmental conditions as specified by EN 50125-3, for indoor and outdoor installation, respectively.

Note: EN 50125-3 contains design requirements and not test requirements.

b) Outdoor temperature range: The relevant outdoor temperature range class according to EN 50125-3 is T2. (Outdoor minimum: -40°C, outdoor maximum: +35°C, minimum inside cubicles: -40°C, maximum inside cubicles: +65°C).

The Customer will allow the application of heated outdoor enclosures. Where heating elements, and where necessary enclosure thermal insulation, ensure a minimum temperature of -25°C at minimum outdoor temperature of -40°C, the installed equipment may be designed correspondingly.

Application of heating elements will also reduce the relative humidity, thereby avoiding condensation.

c) Vibrations: Enclosures for RTUs mounted outdoors will normally be installed on contact line poles which are exposed to vibrations from passing trains. Figure C.3 of EN 50125-3 (ballast vibrations) is believed to best indicate the vibrations of the contact line poles. The delivered equipment shall be designed to withstand such vibrations.

2.3 Insulation coordination and EMC

a) Insulation coordination: Insulation coordination of each delivered installation (e.g. an enclosure with equipment) shall be in accordance with the EN 50124 series. External cables without overvoltage protection shall be regarded as overvoltage category OV4. Protective devices may be applied to reduce the overvoltage category.

Note 1: Surge voltage immunity requirement for equipment is given in the EMC standard. Insulation coordination concerns limiting the actual surges from external cables to lower levels than equipment immunity levels. For example, application of overvoltage protection and/or galvanic insulation will limit the surge levels the equipment is exposed to.

Note 2: External cables act as antennae for voltage surges.

b) Electromagnetic compatibility I: All ports of the RTU shall be conformant with at least one of the following:

• EN 61000-6-2 and EN 61000-6-4. (Generic standards for immunity and emission in industrial environment)
• EN 50121-4 or EN 50121-5 (Product family standard - Railway applications)
• IEC 60870-2-1 (Product family standard - Telecontrol equipment and systems)

c) Electromagnetic compatibility II: RTU design shall make provisions to ensure a high level of immunity against induced interference to cables in the frequency range between 16 2/3 Hz and 50 kHz. Immunity limits shall be stated by the supplier for this frequency range.

Further comments/information:

• In a railway environment long cables are exposed to induction from traction current in the contact line and return system. The EN 50121 series makes no specific immunity requirement for induced voltages, but instead states that induced voltages have to be covered by the functional specification. The traction current has a fundamental frequency of 16.7 Hz, and harmonic components up to around 50 kHz due to switching of power electronic equipment on board rolling stock and inside converter stations.
• Cables for traction current may be installed in parallel with control cables at a spacing of 10 - 20 cm over a distance more than 1 km.
• The immunity level stated by the supplier will serve as a requirement for the engineering of cable routing for limitation of interference voltage to the levels acceptable to the RTU.
• A calculation of induced interference voltage to cables based on worst-case allowable inducing current from the train at various frequencies, spacing between traction cable and low-voltage cable of 10 cm, spacing between conductors inside (straight) low-voltage cable of 3,5 mm, results in calculated induced differential mode voltage per km parallel routing as indicated in the following table:

Frequency	Inducing current	Induced differential mode voltage at highest frequency
16.7 Hz	1200 A	0.88 V/km
300 Hz - 7 kHz	1.0 A	0.31 V/km
7 kHz - 9 kHz	0.5 A	0.20 V/km
Above 9 kHz: 10 kHz	0.33 A	0.15 V/km
Above 9 kHz: 20 kHz	0.33 A	0.29 V/km
At higher frequencies it is assumed that the inducing current will attenuate and be more effectively filtered at the source, so that the resulting interference voltage will not increase above 0,30 V/km. Note that the tabulated values shall not be regarded as immunity test requirements, but as an indication of which level of interference voltage would be expected if no further provisions were taken in order to limit the interference.

2.4 Remote communication interfaces

a) Remote SCADA communication: The communication towards the remote SCADA system shall be on an IP network. Communication based on serial interface shall also be available for backwards compatibility.

b) Protocol TCP/IP port: The port shall be of type Ethernet IEEE 802.3. The physical interface to the IP network shall be an Ethernet port. The ethernet port shall be set up with IP-address, IP-mask and Gateway address.

c) Option, optical Ethernet Protocol port: In order to avoid the need for a fiber switch, with corresponding cost and space requirements, the Customer wishes that an optional optical ethernet port to the RTU be part of the offer. The following requirements applies to this port:

1. The port shall be SFP based and support a variety of transceivers for 9/125 single mode fiber communication over 0-70 km distances.
2. The port shall support uncoded MSA compliant SFPs with standard digital diagnostics monitoring (DDM).

d) Protocol Serial port: The port shall be type RS232 or RS485.

e) Maintenance port: The port shall be type USB, Ethernet or RS232. This port shall be available for local service access.

f) Communication TCP/IP protocol: The communication protocol on the IP network shall be IEC 60870-5-104 NUC (Norwegian User Conventions). The SCADA system shall be master and the RTU shall be slave in the IEC 60870-5-104 protocol.

g) Communication Serial protocol: The communication protocol on the serial interface shall be IEC 60870-5-101 NUC (Norwegian User Conventions). The SCADA system shall be master and the RTU shall be slave in the IEC 60870-5-101 protocol. Some places are not capable of supporting TCP/IP and must apply serial interface as carrier. For future change from serial to TCP/IP, the configuration shall be easy to change with a parameter from IEC 60870-5-101 NUC to IEC 60870-5-104 NUC protocol. This shall be done with a parameter and not by reprogramming.

h) Master frontends: The Customer's SCADA system has 4 frontends, each with its own IP-address. The RTU shall reply on any request from these frontends regardless which frontend makes the request. Only one frontend is active at a time.

Note: Normal procedure during change of master frontend is that the new master does a General polling (GA) of all I/O on the slave RTU. Afterwards only status changes are transferred.

Note: After communication interruption, the master will make a General polling (GA) of all I/O on the slave RTU. The communication may in the meanwhile have been changed to another master frontend.

SCADA frontends for IP interface			SCADA frontends for serial interface

i) I/O map: It shall be possible to export/import the I/O-map to the RTU to/from a spreadsheet.

j) Protocol compliance, Norwegian User Conventions NUC:

• The IEC 60870-5-101 protocol shall be compliant with NUC, Norwegian User Conventions, version 2.0 dated 24.03.2000.
• The IEC 60870-5-104 protocol shall be compliant with NUC, Norwegian User Conventions, version 1.2 dated 04.02.2000.

k) Protocol subset: The subset of IEC 60870-5-104 NUC and IEC 60870-5-101 NUC defined in the following table shall be used. Any use of other objects shall be agreed specifically with the customer.

Report direction	Signal type	Object
From RTU to SCADA	Double indication objects	M_DP_TB_1, double-point information with time tag CP56Time2a M_DP_NA_1, double-point information (GI)
	Single indication objects	M_SP_TB_1, single-point information with time tag CP56Time2a M_SP_NA_1, single-point information (GI)
From SCADA to RTU	Double command object	C_DC_NA_1, double command C_DC_TA_1, double command with time tag CP56Time2a
	Single command object	C_SC_NA_1, single command C_SC_TA_1, single command with time tag CP56Time2a
	Restart RTU	C_RP_NA_1, Reset process command
	Time synchronization	C_CS_NA_1, Clock synchronization command

See Reference 1 for the detailed guidelines for interoperability with IEC 60870-5-104/-101 protocols on the Customer's platform.

l) Cybersecurity standards, risks and updates: The RTU and its development shall comply with relevant Industrial Standards for cybersecurity. The supplier shall explain what standards the RTU comply. Up to date certified products evaluated by a trusted third party will be preferred.

The supplier shall inform in the tender about cybersecurity risks and vulnerabilities with the offered product and specify how it can and should be security hardened and protected. The supplier shall describe their preferred long-term solution for flexible handling of rapidly changing cyber security threats.

Security updates of the RTU shall be available through its lifetime. The customer is a member of KraftCERT (https://www.kraftcert.no/english/index.html) and recommends that the supplier cooperates with KraftCERT about vulnerability and security information. If KraftCERT flags a vulnerability related to the supplied product, the supplier shall on request from the customer issue a security patch.

m) Cybersecurity Encryption, Network Access Control and User Access Control: The RTU shall have the following Cybersecurity functions:

1. Integrated firewall to allow full control of the network traffic for all ethernet ports.
2. Firewall rules for incoming and outgoing network traffic. Validate destination and origin IP address, packet type, port number (whitelisting of network traffic).
3. Security logging of all ports (e.g., protocol ports and maintenance ports) (abnormality, intrusion detection, user login, login failure). Security logs shallare recommended to be transferred to a Bane NOR Syslog Server for optional use by the customer.
4. All ports shall be protected with ID and password. The password shall have management for strength, syntax, and lifetime restriction. Default passwords are not allowed.
5. Ports not in physical use shall be disabled or locked by configuration.
6. Role-based access control. Restricting system access to authorized users by using a set of permissions and grants. Radius server compatibility is recommended for optional use by the customer.

The RTU shall have the following Cybersecurity functions for optional use by the Customer:

1. Support of customer certificates (X509 based)
2. Authentication according to IEEE802.1X
3. TLS 1.2 or better encryption-based IEC 60870-5-104

n) Service access: The RTU shall have the possibility of service access locally or remotely, ref requirement "maintenance port". For remote access with the ethernet port, the communication shall be time limited and the connection shall be encrypted with TLS 1.2 or better. Configuration software including necessary licenses shall be part of the delivery.

o) Time synchronization: The RTU shall be equipped with an internal clock for local time stamping of events. The clock shall be synchronized from the protocol, IEC 60870-5-101 or IEC 60870-5-104. The clock synchronization command, TYPE IDENT 103: C_CS_NA_1 is applied. The accuracy of the clock shall be 10 ms or better.

p) Remote restart: It shall be possible to remotely trig a manual restart of the RTU. Refer to the IEC 60870-5-101 or IEC 60870-5-104.

1. SCADA system sends: Reset process command, TYPE IDENT 105: C_RP_NA_1 with the Cause of transmission=activation.
2. The RTU shall respond to the received command with returning the same protocol message with the Cause of transmission=activation confirmation.
3. The RTU shall then restart.
4. The RTU shall then follow normal powerup procedure.

Design time from remotely trigged restart to RTU is ready for remote communication shall be less than 30 seconds. There will not be verification procedures connected with this time requirement, but the customer may follow it up if it is experienced that the time is significantly longer than required.

2.5 Requirements for Concept 1 RTU for remote control of up to two switching devices

The requirements in this subsection apply for the defined Concept 1 only (remote control of up to two switching devices).

a) Function overview: The RTU for Concept 1 is intended to be a fixed unit which shall not vary between deliveries, i.e. there shall be full interchangeability between all delivered units. The RTU shall be equipped with a minimum of 8 binary inputs and 4 binary outputs, suitable for controlling up to 2 overhead contact line switching devices mounted in the same contact line mast.

Typically the I/O will be configured according to the protocol as 2 double indication objects (switch position), 4 single indication objects (status & alarm) and 2 double command objects (switch close/open). Optionally the binary inputs and outputs should be any combination of double and single point objects.

The I/O map and the reference to the protocol IEC 60870-5-104 shall be parameterizable and not programmed.

b) Installation: The RTU and any associated equipment shall be suitable for outdoor mounting inside an enclosure with an allocated space for RTU of:

• Height: 140 mm
• Width: 310 mm
• Depth: 190 mm

The RTU shall be DIN rail mountable.

Note: Note the tight space. There are 40 mm cable ducts outside the given space above and below.

c) Minimum ambient temperature: The enclosure will be equipped with a thermostat-controlled heating resistor dimensioned for keeping -25°C inside the enclosure at minimum outdoor temperature of -40°C. The minimum temperature requirement to the RTU shall therefore be -25°C.

d) Power supply:

• The RTU shall have a rated supply voltage of 24 VDC.
• The power consumption of the RTU shall be as low as possible. The average power consumption, given for a time period of approximately 10 minutes, shall be lower than 15 W.

Note: The reason for the limitation of power consumption is that in many cases the concept 1 RTUs will be fed from an unstable power source, stabilized via a battery with limited capacity.

e) Potential free inputs and outputs: All electrical input and output contacts shall be potential free.

f) Intermediate relays: The given requirements to the input and/or output contacts may if necessary be achieved by application of intermediate relays. If intermediate relays are applied they shall be part of the delivery.

Note requirements to EMC and insulation coordination especially concerning external cables to/from the enclosure as this may influence on the need for protective provisions such as intermediate relays. The planned cable length for Concept 1 is short as the RTU enclosure will be mounted in the same mast as the connected operating mechanisms. This may lead to reduced need for protective provisions.

g) Binary outputs:

1. Binary outputs shall be designed for a supply voltage of 24 VDC.
2. The contacts of binary outputs shall have have a performance of class 3 as defined in EN 62271-1:2017 clause 6.4.3.4.5 (200 mA continuously, 1 A for 30 ms).
3. The duration of the closed contact shall be between 1 and 5 seconds. If the duration is settable, a default setting of 2 seconds is favoured.

h) Binary inputs:

1. Binary inputs shall be designed for a supply voltage of 24 VDC.
2. The drawn continuous current at 24 V over the input connections shall be lower than 10 mA.
3. Binary inputs shall detect changes in contact position of a duration of more than 70 ms.
   • Note: This requirement has been set in order to make analog or digital noise filtering of frequencies down to 16,7 Hz possible.

2.6 Requirements for Concept 2 RTU for remote control of an arbitrary number of switching devices

The requirements in this subsection apply for the defined Concept 2 only (remote control of 4 - 12 switching devices).

The below figure shows a common set-up on a station for remote control of switching devices within a station area. There is one common RTU controlling an arbitrary number of switching devices, with one cable connection controlling each switching device.

The interface with each cable connection is commonly set up as shown below, with a 7 wire cable which includes signals and power transfer to the switching device. The signal voltage and power supply voltage in the cable is 230 VAC 50 Hz. The high signal voltage is chosen to ensure high immunity against induced disturbances to the cable. The intermediate relays shown are applied if necessary in order to fulfil the specification and protect the RTU against disturbances that are picked up by the cable.

a) Number of controlled switching devices:

1. This part of the specification covers an RTU capable of controlling several switching devices. RTUs capable of controlling up to at least 12 switching devices shall be available. The actual number of controlled switching devices for a specific RTU shall be decided on placement of order.
2. The price model shall be a function of the number of switching devices to be controlled by one RTU. The customer's evaluation model will assign weights to the price of each number of controlled switching devices according to estimated need.

b) Signalling range: For each controlled switching device, the following signals shall be available:

1. Two binary outputs for switching device commands (In / Out) (Double command objects)
2. Two binary inputs for indication of switching device position (In / Out) (Double indication objects)
3. Two binary inputs for free use (One double or two single indication objects)

c) Power supply: The power supply to the RTU shall either be 230 VAC 50 Hz or 24 VDC (the supplier can choose).

1. In case 24 VDC is applied, a suitable power adapter from 230 VAC shall be provided as part of the delivery.
2. The RTU/power adapter shall be designed for 230 VAC 50 Hz voltage and frequency variations as defined in EN 50160. Due to the possibility of long cables, voltage drops to low values may occur during operation of a switching device. Applied equipment shall therefore tolerate voltage drops below the levels given by EN 50160.
3. For Concept 2, there is no specific requirement to the RTU power consumption.

d) Potential free inputs and outputs: All electrical input and output contacts shall be potential free.

e) Intermediate relays: If necessary in order to fulfil the specification, binary outputs and inputs may be equipped with intermediate relays. If intermediate relays are applied, they shall be part of the delivery.

Note requirements to EMC and insulation coordination especially concerning external cables to/from the enclosure as this may influence on the need for protective provisions such as intermediate relays.

Comment: The Customer expects that there will be need for intermediate relays for this application.

f) Binary outputs for command:

1. Binary outputs for command shall be designed for a supply voltage of 230 VAC 50 Hz.
2. The contacts of the binary outputs shall have a performance of class 2 as defined in EN 62271-1:2017 clause 6.4.3.4.5 (2 A continuously, 100 A for 30 ms).
3. The duration of the closed contact shall be between 1 and 5 seconds. If the duration is settable, a default setting of 2 seconds is favoured.

g) Binary inputs for position indication:

1. Binary inputs for position indication shall be designed for a supply voltage of 230 VAC 50 Hz.
2. The drawn continuous current at 230 VAC over the input connections shall be lower than 15 mA.
3. Binary inputs shall detect changes in contact position of a duration of more than 70 ms.
   • Note: This requirement has been set in order to make analog or digital noise filtering of frequencies down to 16,7 Hz possible.

h) Binary inputs for free use:

1. Binary inputs for free use shall be designed for a supply voltage 230 VAC 50 Hz, or 24 VDC (the supplier can choose)
2. In case 230 VAC 50 Hz input is chosen, the same specification applies as for binary inputs for position indication.
3. In case 24 VDC input is chosen, the following specification applies:
   1. A suitable voltage supply for these binary inputs shall be provided as part of the delivery. This may be the same power adapter that provides DC supply voltage to the RTU.
   2. The drawn continuous current at rated DC voltage over the input connections shall be lower than 10 mA.
   3. Binary inputs shall detect changes in contact position of a duration of more than 70 ms.

i) Variants: The RTU shall be available in the following variants:

1. For mounting indoor in an existing or separately procured enclosure.
2. Mounted indoor in an enclosure. This delivery includes the enclosure. Power supply is not included and will be established from an external source.
3. Mounted indoor in an enclosure including power supply. This delivery includes the enclosure with power supply installations.
4. For mounting outdoor in an existing or separately procured enclosure.
5. Mounted outdoor in an enclosure. This delivery includes the enclosure. Power supply is not included and will be established from an external source.
6. Mounted outdoor in an enclosure including power supply. This delivery includes the enclosure with power supply installations.

Note the different environmental requirements for indoor and outdoor mounting according to EN 50125-3.

j) Indoor enclosure: Where the delivery includes an indoor enclosure, the following requirements apply:

1. The enclosure shall be designed according to EN 62271-1.
2. The front door of the enclosure shall be hinged.
3. It shall be possible to lock the front door with a padlock.
4. The front door shall be equipped with a contact connected to a binary input on the RTU.
5. The enclosure shall be equipped with an M12 bolt on the outside for connecting the enclosure to an external bonding.
6. The delivery shall include internal wiring to the installed equipment.
7. Terminal blocks shall be provided as interface to external connections to the enclosure (incoming 230 VAC or 24 VDC, outgoing connections to switching devices).
8. An insulated terminal for terminating the PE conductor of incoming low voltage cable shall be provided.
9. The enclosure shall have extra free space for installation of an auxiliary fiber splitter and network switch.

k) Outdoor enclosure: Where the delivery includes an outdoor enclosure, the requirements for indoor enclosures apply, and in addition:

1. The enclosure shall be protected against ingress of rain water.
2. The enclosure shall be drained.
3. The enclosure shall be protected against condensation by means of heating elements and a ventilation valve.
4. At minimum ambient temperature of -40°C, the enclosure shall provide the operating temperature required by the installed equipment. It is allowed to design heating elements and thermally isolated enclosure in order to ensure a higher temperature inside the enclosure than outside.
5. Heating elements shall be self-regulating with respect to humidity and temperature. The heating elements should be dimensioned for as low power as possible while still fulfilling the temperature and humidity requirements. Requirements for heating elements according to EN 62271-1 clause 6.4.3.4.6 apply.
6. The continuous 230 VAC consumption of the heating elements shall not exceed 150 W.

l) Power supply for enclosure: Where the delivery includes an enclosure with power supply, the following requirements apply to the power supply:

1. The enclosure shall be supplied with 230 VAC 50 Hz from an external power supply cable.
2. In addition to the internal consumption of RTU and heating elements, a margin of at least 30 W shall be added for operation of auxiliary equipment such as a network switch.
3. An additional 230 VAC load during operation of a switching device must be expected to reach 1 kW for a duration less than 10 seconds.
4. After an interruption of the 230 VAC power supply, all delivered equipment shall restart automatically.
5. A surge protection type 3 according to IEC 63641 shall be applied to the 230 VAC circuit. It may be an integral part of delivered equipment, or a separate unit.
6. The following short-circuit protection shall be supplied in the 230 VAC circuit. All protective devices shall be prepared for installation of supervisory circuits. Protective devices shall be in accordance with EN 60898 series.
   1. One protective device for enclosure heating, lighting and internal control circuits that do not directly influence on the operation of the RTU or associated switching devices.
   2. One protective device for supply to the RTU.
   3. One protective device for power supply, command and indication for each controlled switching device. This protective device shall have a rated current of 4 A and a characteristic type "C" in accordance with the EN 60898 series.
7. A supervisory circuit shall be installed for each of the supplied protective devices, connected to the binary inputs for free use.

3 Spare parts

The supplier shall include a list of spare parts with prices in the offer. Spare parts may be ordered separately according to this list if replacements are necessary.

4 Acceptance requirements

In addition to tests required by the relevant standards, the following tests shall be carried out successfully towards the Customer's SCADA system before signing the contract. The tests are specified based on the Customer's earlier experiences with RTU functionality during disturbances.

1. Connection of a test specimen towards the Customer's network, with typical configuration.
2. Verification of service access possibilities (local maintenance port and via remote connection).
3. Verification of correct implementation of IEC 60870-5-104 NUC and IEC 60870-5-101 NUC
4. Test of manually triggered remote restart of the RTU.
5. Test of seamless switching of communication between the 4 hosts.
6. Test of correct restart after communications interruption (disconnect then reconnect communications cable).
7. Test of correct restart after power supply interruption (disconnect then reconnect the 230 VAC power supply).
8. Test of correct restart after simultaneous interruption of both power supply and communications (disconnect then reconnect the power supply to both RTU and network switch simultaneously).

5 Documentation

a) Documentation: The following documentation shall be given with the tender. Where relevant, example documentation is accepted at tender stage, in which case this shall be updated after signing the contract.

1. Data sheet and declaration of conformity for all offered equipment
2. Text description of the delivery and implemented functionality
3. Circuit diagrams
4. Component drawings with dimensions and mounting details
5. Interface documentation for external cable connections including electrical requirements for each interface, requirements to conductor dimensions, etc.
6. Manual for installation and maintenance
7. Documentation of configuration software
8. Compliance list with this technical specification. Compliance or non-compliance shall be declared for each requirement, together with a short statement (1-2 sentences) on how compliance is achieved.

b) Language: Documentation language shall prefereably be Norwegian or English, alternatively Danish or Swedish.

c) Format: Documentation shall be delivered in an open format, e.g., Portable Document Format (PDF) or similar.

6 References

1. Fil:Interoperability List IEC 60870-5-104 v2.pdf

7 Appendix

7.1 Expandability

The concept for the RTUs in this spesification is for simple remote control of overhead contact line switching devices for a frame agreement. However, there might be future single applications requiring expanded functionality. The supplier is encouraged to give information on expandability for the following application still fullfilling the other requirements in the specification. The lack of such expandability or no information given is not influencing the evaluation for the frame agreement.

Concept 1 and 2: One analog input for overhead contact line voltage measurement having a minimum resolution of a) 1 second and b) 0.06 seconds.