CP1550: Updates to monitoring of voltage failure alarms requirements
Formal title: Updates to monitoring of voltage failure alarms requirements
This Change Proposal looks to simplify the management of phase failures and update the requirements of voltage failure alarms.
CP1550 seeks to clarify to Meter Agents how phase failures should be managed and to remove the outdated requirement currently outlined in section 5.1.3 of CoPs1 and 2.
Section 5.1.3 of Code of Practice (CoP) 1 ‘The metering of circuits with a rated capacity exceeding 100 MVA for Settlement purposes’ and CoP2 ‘The metering of circuits with a rated capacity not exceeding 100 MVA for Settlement purposes’ outlines the requirement for monitoring voltage transformers and creating failure alarms at CoP1 and CoP2 sites.
Currently, there is a lack of clarity around the technical requirements of monitoring Voltage Transformers (VTs) and whether voltage monitoring (i.e. phase failure) can or cannot be combined with other prevailing conditions before the phase failure alarm is activated.
Also, the obligation where a separate Outstation (a data logger) is used that requires a phase failure alarm to be flagged in a manned location is obsolete for CoPs 1 and 2 Metering Systems. This is because most new Power Stations do not use separate Outstations nor have manned locations at the site.