Loss of Mains Relays (LoM) for Generation Interface Protection
Chris Goodhand, Innovation Manager (01977 605641)
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Innovation Funding Incentive
LV & 11kV Networks
To build on the Loss of Mains (LoM) work carried out at Strathclyde University
in 2006 to understand the behaviour of the LoM relays currently
on the market under various simulated fault conditions for different
generic types of generator. To produce a Technical Standard on testing
procedures for LoM relays based on realistic simulation
scenarios so that the performance of LoM relays can be
assessed against a common standard and manufactures have a reference
document to developing algorithms and relay decision making process
against. To produce a risk template for risk based assessment to
determine the level of interface protection required.
The project aims to realise the following objectives:
- To better understand the performance of the LoM
relays currently available so that a set of typical settings can be
established for the main generic types of generators and control
systems for each type of relay.
- To enable a risk based assessments to be carried out when
determining what generator interface protection to fit for a
particular generator size and type.
- To produce a Technical Standard on testing procedures for loss
of mains relays so they can be assessed in a consistent manner.
This standard will specify a set of faults that the relays must be
stable for these will be in the form of comtrade files. The
standard will also provide guidance on the parameters to be
used in the relays to provide a bench mark minimum standard
for relay manufactures to work to in the development of future
loss of mains relays.