Control/TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/Time/t1 and t2l.For cases where single-mode voltage control is implemented, the Parameter Settingmenu structure includes TR1ATCC:1 instead of the parallel designator TR8ATCC:1.10.9.4.1 Secondary testThe voltage control function performs basic voltage regulation by comparing acalculated load voltage (UL) against a voltage range defined by setting UDeadband(with upper and lower limits U2 and U1 respectively). The calculated load voltage ULrepresents the secondary transformer bus voltage UB adjusted for Load dropcompensation (LDC) where enabled in settings.Note that when LDC is disabled, UB equals UL.When the load voltage UL stays within the interval between U1 and U2, no action willbe taken.If UL < U1 or UL > U2, a command timer will start, which is constant time or inversetime defined by setting t1 and t1Use. The command timer will operate while themeasured voltage stays outside the inner deadband (defined by settingUDeadbandInner).If UL remains outside of the voltage range defined by UDeadband and the commandtimer expires, the voltage control will execute a raise or lower command to thetransformer tap changer. This command sequence will be repeated until UL is broughtback within the inner deadband range.10.9.4.2 Check the activation of the voltage control operation1. Confirm Transformer Tap Control = On and Transformer Voltage Control = On• Direct tap change controlMain menu/Settings/Setting Group N/Control/TransformerTapChanger(YLTC,84)/TCMYLTC:x/TCLYLTC:x/Operation• Automatic transformer voltage controlMain menu/Settings/Setting Group N/Control/TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/General/Operation• Enable Tap CommandSection 10 1MRK 511 360-UEN ATesting functionality by secondary injection158 Bay control REC670 2.1 IECCommissioning manual
