Kontaktledning/Reservestrømstransformator


1 SCOPE

These specifications apply to the production and delivery of auxiliary 16.7 Hz power transformers to Norwegian National Railway Administration (NNRA).

2 FUNCTIONAL REQUIREMENTS

Auxiliary power transformers shall provide essential power supply when the normal power (50 Hz) supply system fails.

2.1 Expected lifetime for auxiliary power transformer

Expected lifetime shall be at least 40 year.

2.2 Electrical requirements

2.2.1 Power requirements

Three sizes of transformers are requested:

Type 1: 10 kVA
Type 2: 25 kVA
Type 3: 50 kVA

2.2.2 Voltages and frequencies

a) Voltage at primary circuit 15 kV 15/-25%
b) Voltage ratio 15.0/0.23 kV 1-phase
c) Frequency 16.7 Hz
d) Short-circuit reactance 5.5 %

2.2.3 Insulation level

a) Feed-trough connections for the primary circuit at least 36 kV
b) Feed-trough connections for the secondary circuit at least 2 kV
c) Insulation between the circuits and other parts of the transformers at least 36 kV
d) Operational withstanding voltage (effective value) 70 kV
e) Impulse withstanding voltage (refer to a surge of 1.2/50 μs) 170 kV

2.2.4 Connections

a) The connections on the primary circuit shall be labelled with “A” and “B” and the connections on the secondary circuit shall be labelled with “a” and “b”. (refer to figure 1)

Figur - figur

2.2.5 Earthing

a) The auxiliary power transformer shall have a marked connection point for earth connections on the transformer tank. Protective earth wire shall be at least 50 mm2 Cu

2.2.6 EMC

a) The equipment shall be able to operate in an industrial environment as identified in EN 61000-6-2 and tested according to this specification
b) For electromagnetic radiation, the equipment shall comply with the requirements set to a common reference environment as identified in EN 61000-6-3 and tested according to this specification

2.3 Mechanical requirements

2.3.1 Mechanical design

The auxiliary power transformer shall:
a) Be performed in stainless or galvanized steel, according to [Fe / Zn Class A NS 1978]
b) Preferably be dry insulated
c) Be installed in a kiosk on the ground or installed on OCL poles, type H and type B

  1. On pole: Maximum weight of the transformer is 500 kg

d) Meet all functional requirements for ambient temperatures between -40°C and +50°C
e) Preferably be equipped with touch-safe feed-through connection

2.3.2 Kiosk

a) The kiosk shall provide safety functions and weather protection
b) The kiosk in outdoor environment shall withstand snow loads according to NS-EN 1991-1-3:2003
c) The kiosk shall have physical barriers between installations for high voltages (HV) and low voltages (LV)
d) The kiosk should give protection against intrusion of dust and moisture
e) For kiosks with oil insulated power transformers there should be an arrangement for proper collection of spill oil
f) There shall be one type 1 key lock for the entrance into the LV section
g) The entrance to the HV section should be from the LV section
h) The entrance to the LV section shall be marked with a warning sign, ref. to ISO 3864:2002 and ISO 7010:2003+A1:2006 with the meaning: “Caution, risk of electric shock”. Any entrance to the HV section shall also be labelled with the same sign
i) There shall be one type 2 key lock for the entrance into the telecom rom
j) Relevant build-out for kiosks are found in the following table
k) The tender shall include a technical description that documents:

  1. Protection category (IP classes, EN 60529)
  2. Cooling
  3. Oil spill collection
  4. Frost resistant foundation
  5. Cable

2.4 Kiosk

a) There should not be any need for special tools for installation and connection
b) For equipment that may need special tools for installation or connection this shall be supplied free of charge

2.5 Environmental Requirements

2.5.1 Temperature

a) The auxiliary power transformer shall be tested according to IEC 60068-2-1 Test Ab, IEC 60068-2-2 test Bd, IEC 68-2-14 test Nb. See Appendix 1

2.5.2 Moisture/dust

a) Density ratio shall be independent of the location so that moisture and dust does not reduce life and performance. Oil insulated transformers shall have a hermetically sealed oil system and shall be tested according to IEC 60068-2-30 test Db and IEC 529. See Appendix 1

2.5.3 Vibration

a) The transformer shall have an appropriate design so that no vibration damage occurs and shall be tested in according to IEC 60068-2-6 test Fc. See Appendix 1

2.5.4 Corrosion

a) The materials selected shall be resistant to corrosion, according to [Fe / Zn Class A NS 1978]

2.6 Documentation

2.6.1 Drawings/Documents

a) The following drawings shall be delivered:

  • Plan and cross-section of the transformer, with weight and dimensions
  • Circuit diagram, internal and external
  • System Drawings for installation of transformer

b) Drawings shall be delivered in paper format and file format (*.dwg, *.pdf) and parts list in paper format and open file formats for spread sheets c) All documentation shall be submitted in English or Norwegian

  1. Maintenance and operating documentation shall be in Norwegian

2.7 Labeling

a) The auxiliary power transformer shall have a rating plate that shall show: date of manufacture, net weight, weight w/oil, oil type and quantity, manufacturer's company name and any catalogue number, clearly visible and of such quality that it does not disappear or weaken the structure
b) The auxiliary power transformer documents shall be supplied with each transformer. This document will include technical data, and date of manufacture, net weight, weight w/oil, oil type and quantity, manufacturer's company name and any catalogue number
c) The suppliers test protocol shall follow each delivery

2.8 Storage & transport

a) Transport, storage and installation shall be according to IEC 60068-2-1 test Aa, IEC 60068-2-2 test Ba, IEC 60068-2-14 test Na, IEC 60068-2-30 test Db, IEC 60068-2 - 6 test Fc and IEC 60068-2-32 test Ed. See Appendix 1
b) The transformer/kiosk shall be delivered on pallets and suitable for handling by forklift and with suitable brackets for crane lifting

3 REFERENCES

IEC 60068-2 parts 1, 2, 6, 14, and 30, Environmental Testing
IEC 60076, Power Transformers -
IEC 60726, Degrees of protection provided by enclosures (IP code) (IEC 60529)
EN 61000-6-2, Electromagnetic compatibility (emc) - Generic standards - Immunity for industrial environments
EN 61000-6-3, Electromagnetic compatibility (emc) - Part 6-3: Generic standards - Emission standard for residential, commercial and light-industrial environments NS 1978 class A
NEK 240-1:2008, Isolerolje – Kvalitative krav, overvåkning og vedlikehold

FEF 2006
FOR 2011-01-14 NR 36 (FEU)
NEK 400:2010

4 APPENDIX

Appendix: drawings

  • Sketch of arrangement for the auxiliary power transformer, Appendix 8B
  • Product Dimensions, 10 kVA 1-phase oil insulated transformer

5 CHECKLIST

The supplier shall sign out all points of the specification in the following checklist. Any deviation from these requirements shall be commented, which points a), b), c), etc., that are not met and what / why point is not fulfilled.

Description of requirement Compliant (Yes/No) Supplier’s references Supplier’s comments
2.2.1 Power requirements


2.2.2 Voltages and frequencies
a)
b)
c)
d)
2.2.3 Insulation level
a)
b)
c)
d)
e)
2.2.4 Connections
a)
2.2.5 Earthing
a)
2.2.6 EMC
a)
b)
2.3.1 Mechanical design
a)
b)
c)
d)
2.3.2 Kiosk
a)
b)
c)
d)
e)
f)
g)
h)
i)
j)
k)
2.4 Tools
a)
b)
2.5.1 Temperature
a)
2.5.2 Moisture/dust
a)
2.5.3 Vibration
a)
2.5.4 Corrosion
a)
2.6.1 Drawings
a)
b)
2.7 Labeling
a)
b)
c)
2.8 Storage & transport
a)
b)