The McNeill station was also notable for operating with an exceptionally low " Short Circuit Ratio ".
2.
The Short Circuit Ratio ( SCR ) is a measure of how strong or weak the connected AC system is.
3.
This was a significant advantage since the extremely low short circuit ratio required the reactive power to be controlled within very tight limits, leading to frequent switching operations.
4.
Most HVDC schemes using line-commutated converters operate with a SCR of at least 3, but the McNeill scheme was designed to operate with an " Effective Short Circuit Ratio " ( ESCR a measure which subtracts the harmonic filters from the evaluation of Short Circuit Ratio and is more meaningful on very weak AC systems ) of less than 1.0 on the Saskatchewan side.
5.
Most HVDC schemes using line-commutated converters operate with a SCR of at least 3, but the McNeill scheme was designed to operate with an " Effective Short Circuit Ratio " ( ESCR a measure which subtracts the harmonic filters from the evaluation of Short Circuit Ratio and is more meaningful on very weak AC systems ) of less than 1.0 on the Saskatchewan side.
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