P12x/EN T/Eb6 - Schneider - error

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P12x/EN AP/Eb6Page 32/78Application GuideMiCOM P120/P121/P122/P12311.2 Setting GuidelinesThe current setting is calculated as:Thermal Trip (θtrip) = Permissible continuous loading of the plant equipment / CT ratio.Typical time constant values are given in the following tables. The ‘Time Constant’parameter is given in minutes.Paper insulated lead sheathed cables or polyethylene insulated cables are placed above theground or in conduits. The table shows τ in minutes, for different cable rated voltages andconductor cross-sectional areas:CSA mm 2 6 -11 kV 22 kV 33 kV 66 kV25 - 50 10 15 40 -70 - 120 15 25 40 60150 25 40 40 60185 25 40 60 60240 40 40 60 60300 40 60 60 90Time constant τ (minutes)Other plant items:Time constant τ (minutes)Dry-type transformers 4060 - 90Air-core reactors 40Capacitor banks 10LimitsRating < 400 kVARating 400 - 800 kVAOverhead lines 10 Cross section ≥ 100 mm 2 Cuor 150mm² AlBusbars 60An alarm can be raised when reaching a thermal state corresponding to a percentage of thetrip threshold. A typical setting might be ‘Thermal Trip’ = 70% of thermal capacity.
Application GuideP12x/EN AP/Eb6MiCOM P120/P121/P122/P123 Page 33/7812. COLD LOAD PICK-UP (P122 & P123 ONLY)The Cold Load Pick-up feature allows selected settings of MiCOM P122 and P123 relays tobe changed to react to temporary overload conditions that may occur during cold starts. Thiscondition may happen by switching on large heating loads after a sufficient cooling period, orloads that draw high initial starting currents.When a feeder is energised, the current levels that flow for a period of time followingenergising may differ greatly from the normal load levels. Consequently, overcurrent settingsthat have been applied to give short circuit protection may not be suitable during this period.The Cold Load Pick-up (CLP) logic raises the settings of selected stages for a set duration(tCL). This allows the protection settings to be set closer to the load profile. Cold load pick-upcannot restart until the end of tCL duration. The CLP logic provides stability, withoutcompromising protection performance during starting.The CLP can be started by digital logic Input 52A and/or internal threshold detection by (NotI< & I>) and/or internal threshold detection by (Not I0< & I0>).If the CB positions are not available, to detect the Cold Load Pick-up start, a new internalthreshold is created named autostart.To detect the Cold Load Pick-up, the three phases current should be under 5% of In. Whenthe current grows up to In or more, with a time of less than 200 ms, an internal edgedetection is created.In >IAIBICCLP does not startIn >Time morethan 200msIA IB ICOne phase isupper than 5% ofIn at start.Internel Virtualthreshold 5% InInternel Virtualthreshold 5% InT In, in less than 200msInternel Virtualthreshold 5% InT
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MiCOMP120/P121/P122/P123Overcurrent
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