Electricity Transmission Networks
The scope of project involves two stages:
Investigate the feasibility of a standard harmonic filter “building block” that can be deployed at 33kV to mitigate increased harmonic voltages that are primarily due to amplification of background harmonics.
- Carry out a review of where problems have arisen, within SPEN and the UK if possible.
- Recommend a filter “block size”, i.e. filter MVAr rating that would be suitable for most SPT (or SPD/SPM) sites.
- Develop a cost effective design for the filter – Although “C-type” damped filter design is envisaged, other designs can be proposed if these are deemed more cost effective or offer improved performance.
- Optimise design by considering cost, performance, footprint, losses, visual impact and other environmental factors.
- Broadly define the application range, i.e. network designs or characteristics of networks for which the filter is suitable, reasonably efficient and cost effective.
If Stage I shows that a standard harmonic filter is feasible, the second project stage will aim to develop a detailed filter design and a component-level specification which can be used when tendering for filters.
- Develop Insulation coordination and surge arrestor requirements.
- Develop Protection and harmonic monitoring requirements.
- Develop Switching requirements. Can a standard 33kV circuit breaker be used?
- Develop detailed component specification.
- Spares recommendation.
- Develop building and ventilation requirements for indoor installation, specify footprint requirements including exclusion zone for electromagnetic fields, and requirements for possible future relocation of a filter.
- Produce an application guide for design engineers
Reduce costs by deploying a standardised design
Improve the management of harmonic voltage levels on transmission networks
Substantially reduce the risk of harmonic non-compliance
Provide an increased level of certainty regarding harmonic mitigation requirements to developers
Production of Stage I final report
Production of Stage II final report – If Stage I suggests that a standard harmonic filter is feasible