What is BS EN 2591-227 - Partial discharges test about ?  
BS EN 2591-227 defines methods to measure the partial discharge inception/extinction voltages (PDIV, PDEV) and partial discharge levels under specific temperatures and pressures on an electrical connector for aircraft use. It shall be used together with EN 2591-100.
EN 2591-227 has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN).
Who is BS EN 2591-227 - Partial discharges test for ? 
BS EN 2591-227 on partial discharges test is useful for: 
- Spacecraft and space products manufacturers         
- Aerospace products manufacturers   
- Testing agencies involved in the inspection of spacecraft and aerospace products         
- Quality control personnel for spacecraft products      
- Aeronautical engineers 
- Space researchers
Why should you use BS EN 2591-227 - Partial discharges test ?  
For a connector, the presence of partial discharge effects at operating voltage may result in a significant reduction of service life.
Evidence of partial discharges during operation signifies for example:
- Distance between contact cavities is insufficient for the applied voltage
- The quality of the insulation is inadequate possibly due to excessive size of the cavities or voids inside the insulation
- A leakage way is present, resulting in a local reduction of the connector insulation properties
The most significant parameters which may influence PDIV, are when both low pressure and high temperature could be combined (engine area for example).
The aim of this BS EN 2591-227 is to define the test method and procedure which will determine if an electrical connector will be subjected to partial discharges; in particular, when it is exposed to a specified temperature and pressure based on an Aircraft environment. 
