avoid unnecessary operation during shorter voltage deviations from the target value,and in order to coordinate with other automatic voltage controllers in the system.TCMYLTC and TCLYLTC are an interface between TR1ATCC and TR8ATCC andthe transformer load tap changer. More specifically this means that it receivesinformation from TR1ATCC or TR8ATCC and based on this it gives command-pulses to a power transformer motor driven on-load tap changer and also receivesinformation from the load tap changer regarding tap position, progress of givencommands, and so on.TCMYLTC and TCLYLTC also serve the purpose of giving information about tapposition to the transformer differential protection T2WPDIF and T3WPDIF.14.4.10 Technical dataTable 447:TCMYLTC and TLCYLTC technical dataFunction Range or value AccuracyTransformer reactance (0.1–200.0)Ω, primary -Time delay for lowercommand when fast stepdown mode is activated(1.0–100.0) s -Voltage control set voltage (85.0–120.0)% of UBase ± 0.25 % of UrOuter voltage deadband (0.2–9.0)% of UBase -Inner voltage deadband (0.1–9.0)% of UBase -Upper limit of busbar voltage (80–180)% of UBase ± 0.5% of UrLower limit of busbar voltage (70–120)% of UBase ± 0.5% of UrUndervoltage block level (50–120)% of UBase ± 0.5% of UrTime delay (long) forautomatic control commands(3–1000) s ± 0.2% or ± 600 mswhichever is greaterTime delay (short) forautomatic control commands(1–1000) s ± 0.2% or ± 600 mswhichever is greaterMinimum operating time ininverse mode(3–120) s ± 0.2% or ± 600 mswhichever is greaterLine resistance (0.00–150.00)Ω, primary -Line reactance (-150.00–150.00)Ω, primary -Load voltage adjustmentconstants(-20.0–20.0)% of UBase -Load voltage auto correction (-20.0–20.0)% of UBase -Duration time for the reverseaction block signal(30–6000) s ± 0.2% or ± 600 mswhichever is greaterCurrent limit for reverseaction block(0–100)% of I1Base -Overcurrent block level (5–250)% of I1Base ± 1.0% of Ir at I≤Ir± 1.0% of I at I>IrLevel for number of countedraise/lower within one hour(0–30) operations/hour -Table continues on next page1MRK502052-UEN B Section 14Control759Technical manual
