G59/3 Witness Testing & Commissioning
Pannell & Partners undertakes G59/3_3 testing and G59 pre-commissioning with DNO (Distribution Network Operator) presence for G59 relay and system approval across the whole of the UK. Following on from G59 acceptance, we can offer Firm Frequency Response Testing (FFR) to National Grid requirements.
Periodic Testing - a requirement of ENA's G59/3_3 Document. Please contact us to programme in a suitable schedule for your "Loss-of-Mains" protection system.
LATEST - The recent release of G59/3_3 states that installations commissioned after 1st February 2018 must use "Rate of Change of Frequency" (RoCoF) for Loss of Mains (LoM) protection and no longer "Vector Shift". As part of your periodic testing of the protection relay (as required by G59) we can re-programme and test it to provide RoCoF protection instead of Vector Shift.
These G59 tests are applicable to battery energy storage (BESS), PV (photovoltaic) solar panel installations, wind turbine installations, CHP (combined heat and power) installations including Anaerobic Digester installations and rotating machine embedded generation.
Our extensive experience in G59 witness testing, from battery energy storage, commercial rooftop solar PV to the UK's largest ground mount solar PV parks, hydroelectric, CHP, wind turbine and short term parallel generators means that you can have confidence in successful G59 tester witness testing completion.
We strongly recommend contacting us at the same time as the DNO when booking a G59 witness test, so we may converse directly with the DNO to arrange mutually conducive dates. This prevents the embarrassing situation of not being able to find a G59 tester for the witness test if it is left too close to the commissioning date.
Our many clients have also recognised the benefits of arranging a pre-commissioning G59 test prior to the scheduled witness test. Any problems found can be remedied before the DNO is due to attend site, if arranged a day or two (or longer) before the final witness test. This saves missing deadlines, losing money and requesting repeat visits from the DNO - a problem with their very busy schedules.
Feedback from DNO engineers has shown that they are very impressed when clients have taken this initiative to prepare their sites properly before the witness test - it gives them confidence in the system.