ELECTRIFICATION
• •
HV cable pressure testing Earthing system testing
During the SAT phase of the works, WJ Project Services Ltd used its own OMICRON CMC 353 secondary test set to carry out the testing of the protection scheme. The total number of protection devices across the two sites is summarised below:
Location
Relay Device Type
Schneider P143 Feeder Management
Siemens 7ST61 Distance Protection
Willow Park ATFS
31 20
Ordsall Lane MPATS
16 10
With 77 devices to apply settings to and test on site, it was necessary to undertake the testing using a consistent and clearly defined testing method. The advantages of using the OMICRON CMC 353 test set with the Test Universe software were that a pre-defined report format could be used to test each relay, from which records could be easily collated into the hand-back documentation and a custom report produced for each panel.
System testing – short circuits
from delivery to site though to energisation of the substations, the construction activity started with the installation of the 400mm2 HV cabling. Some 27km of HV cabling was required to cable the two substation buildings to the new and existing OLE infrastructure.
During the site commissioning, all disciplines needed to be inside the building together: construction pulling in and terminating HV cables, the switchgear connecting the two-part Willow Park ATFS busbar together, telecoms installing pilot circuits, and electricians installing the LV and control wiring to the external plant.
With this construction activity taking place, the SAT commissioning works needed to continue to achieve the incoming feeder transfer and energisation dates in July 2013. SAT consisted of the following:
• • • •
• • HV Pressure testing
Busbar Contact resistance testing Functionality testing of the switchgear
Application and secondary injection of final protection settings Autotransformer testing
• SCADA testing to the Network Rail Electrical Control Room (ECR) On site functional testing
On completion of the SAT phase one of the incoming feeders at Willow Park ATFS was commissioned into service and used to energise the new substation arrangement. This 25kV supply allowed the HV busbars / HV cables and autotransformers to be soak-tested over a 24- hour period. A further requirement was to carry out a short circuit test to prove the stability of the incoming protection scheme, and verify that the new Willow Park ATFS site met the BS- EN-50122 standards for rise of earth potential.
There had been concerns that due to the site being constructed on made-up ground, the earthing system would not perform as required. Thankfully, results showed rise of earth potentials within the limits defined by the standard.
With Network Rail acceptance, Willow Park ATFS was switched in to feed the WCML, replacing the old Parkside FS. Section proving was undertaken at the end of the WCML July 2013 blockade, and relay directional testing verified to prove the protection scheme on the Siemens 7ST61 relays.
Following on from the entry into service of Willow Park ATFS, the final connections of Ordsall Lane MPATS were undertaken to the newly installed overhead infrastructure on the Liverpool to Manchester lines. With this line
Further IEC 61850 Testing
In conjunction with the EPDG, the Willow Park ATFS to Ordsall Lane MPATS substation system, connected via optic fibre for IEC 61850 functionality, has been used as a test bed for developing the new Rationalised Auto Transformer Scheme (RATS). This system is being developed for use on the Great Western Electrification Project, whereby overhead line section circuit breakers will be kept to a minimum and, instead, load break switches will be installed. Under fault conditions, tripping of the entire system takes place with IEC 61850 protocol with Generic Object Oriented Substation Events (GOOSE) messaging used to isolate and reconfigure the overhead line system around the fault.
WJ Project Services Ltd is supporting Network Rail during the development of RATS, using dynamic testing techniques such as GPS- linked OMICRON secondary injection test equipment to simulate / inject simultaneous fault conditions at different site locations, to replicate and model overhead line tripping events and in turn see how the protection system will react.
About the author
Ashley Jordan (MEng (Hons) MIET) has more than 12 years of power distribution and commissioning experience, having worked on many of the UK’s large electrification projects. He is a Member of the IET and has a high level of practical and technical ability in project managing, planning, supervising, construction, maintenance
and repair of
Network Rail’s 25kV AC / 750DC, distribution, plant and OLE. He has worked most recently as commissioning manager for the North West Electrification – Phase 1 Autotransformer Project.
This paper was presented at the OMICRON Protection
Testing
Conference & Workshop in collaboration with ABB from 10-12 June 2014.
Ashley Jordan
opinion@railtechnologymagazine.com TELL US WHAT YOU THINK
rail technology magazine Jun/Jul 14 | 47
having never been electrified, it was necessary to carry out four short circuit tests to prove protection discrimination and immunisation of the existing signalling equipment against the new overhead line system.
This final system energisation and verification allowed the first Pendolino trains to begin running on the lines for driver training in November 2013.
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