CEE Relays Ltd.

87C Whitby Road, Slough, SL1 3DR

Telephone: (01753) 576477        Fax: (01753) 825661

Website: www.ceerelays.co.uk

Automatic LTC Tap Setting Datablock Attribute

If PTW has run a load-flow study, which includes modelling automatic LTCs (Load Tap Changers), the load-flow results are shown as they would be with the transformers at their ideal taps. The ideal tap can be displayed using the "ubLF_LTC Pri Tap", "ubLF_LTC Sec Tap", "LF_LTC Pri Tap", "LF_LTC Sec Tap" datablock attributes.

If the LTC Transformer option is "greyed-out" in the load-flow set-up, this is probably because it is not available with the "current injection" calculation method. Changing to the Newton-Raphson calculation method will make the LTC Transformer option available.

Note: The "LF_LTC Pri Tap" and "LF_LTC Sec Tap" datablock attributes are not available in V6.0 and earlier, so the ubLF ones need to be used instead.