ABB REC670 Product Manual

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Contents

ABB REC670 Product Manual Manual pdf 38 page image

The fault locator is an impedance measuring function givingthe distance to the fault in km, miles or % of line length. Themain advantage is the high accuracy achieved bycompensating for load current and for the mutual zero-sequence effect on double circuit lines.The compensation includes setting of the remote and localsources and calculation of the distribution of fault currentsfrom each side. This distribution of fault current, together withrecorded load (pre-fault) currents, is used to exactly calculatethe fault position. The fault can be recalculated with newsource data at the actual fault to further increase theaccuracy.Especially on heavily loaded long lines, where the sourcevoltage angles can be up to 35-40 degrees apart, theaccuracy can be still maintained with the advancedcompensation included in fault locator.Event counter with limit supervison L4UFCNTGUID-13157EAB-1686-4D2E-85DF-EC89768F3572 v6The Limit counter (L4UFCNT) provides a settable counter withfour independent limits where the number of positive and/ornegative flanks on the input signal are counted against thesetting values for limits. The output for each limit is activatedwhen the counted value reaches that limit.Overflow indication is included for each up-counter.Running hour-meter TEILGAPC GUID-464FB24F-B367-446C-963A-A14841943B87 v2The Running hour-meter (TEILGAPC) function is a functionthat accumulates the elapsed time when a given binary signalhas been high.The main features of TEILGAPC are:• Applicable to very long time accumulation (≤ 99999.9hours)• Supervision of limit transgression conditions and rollover/overflow• Possibility to define a warning and alarm with theresolution of 0.1 hours• Retain any saved accumulation value at a restart• Possibilities for blocking and reset• Possibility for manual addition of accumulated time• Reporting of the accumulated timeEstimation of transformer winding insulation life LOLSPTRGUID-CDE89397-8E99-4873-9701-FF642101A308 v2Estimation of transformer winding insulation life (LOLSPTR) isused to calculate transformer winding hot spot temperatureusing the empirical formulae. It is also used to estimatetransformer loss of life from the winding hot spot temperaturevalue. The transformer winding insulation is degraded whenthe winding hot spot temperature exceeds certain limit.LOLSPTR gives warning and alarm signals when the windinghot spot temperature reaches a set value.Hot spot temperature calculation requires top oil temperatureat a given time. This value can either be a measured valuetaken through sensors or the one calculated by the function.This decision is made based on the top oil temperaturesensor quality. Top oil temperature calculation is done usingthe method explained in IEC 60076-7 standard.Inputs required for hot spot temperature calculation are:• Transformer oil time constant• Winding time constant• Loss ratio at different tap positions• Ambient temperature around the transformerThe oil and winding time constants can be calculated by thefunction based on transformer parameters if the inputs arenot available from the transformer manufacturer.Ambient temperature to the function can either be providedthrough the sensor or monthly average ambient temperaturesettings. This decision is made based on the ambienttemperature sensor quality. Additionally, LOLSPTR functionprovides difference between measured value and calculatedvalue of the top oil temperature.Additionally, the function calculates loss of life in form of daysand years. This information is updated at settable intervals,for example, hourly or daily. Transformer winding percentageloss of life is calculated every day and the information isprovided as total percentage loss of life from the installationdate and yearly percentage loss of life.15. MeteringPulse-counter logic PCFCNT M13394-3 v7Pulse-counter logic (PCFCNT) function counts externallygenerated binary pulses, for instance pulses coming from anexternal energy meter, for calculation of energy consumptionvalues. The pulses are captured by the binary input moduleand then read by the PCFCNT function. A scaled servicevalue is available over the station bus. The special Binaryinput module with enhanced pulse counting capabilities mustbe ordered to achieve this functionality.Function for energy calculation and demand handlingETPMMTR GUID-6898E29B-DA70-421C-837C-1BBED8C63A7A v3Power system measurement (CVMMXN) can be used tomeasure active as well as reactive power values. Function forenergy calculation and demand handling (ETPMMTR) usesmeasured active and reactive power as input and calculatesthe accumulated active and reactive energy pulses, in forwardand reverse direction. Energy values can be read orgenerated as pulses. Maximum demand power values arealso calculated by the function. This function includes zeropoint clamping to remove noise from the input signal. Asoutput of this function: periodic energy calculations,integration of energy values, calculation of energy pulses,alarm signals for limit violation of energy values and maximumpower demand, can be found.1MRK 511 404-BEN ABay control REC670 2.2Product version: 2.2.138 ABB