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P-Setting Pick-up power setting. Angle Characteristic angle for the power measurement. 0° = real power forwards 180° = real power backwards -90° = apparent power forwards 90° = apparent power backwards All angles between -180° and 180° can be set. Drop-Ratio Reset ratio of the measuring trigger. Delay Delay between the protection picking up and the protection tripping. The delay setting also influences the reset time of the function. For t > 100 ms, the protection resets after 50 ms. Resetting is not otherwise intentionally delayed. Phi-Comp Compensation of c.t. and v.t. phase errors. The setting concerns only the difference between the two errors. CurrentInp Defines the input channel used for the neutral current. Only single-phase c.t. inputs can be set. VoltageInp Defines the input channel used for the neutral voltage. Only single-phase v.t. inputs can be set. PN Rated power given by UN*IN. BlockInp Input for blocking the sensitive E/F function. F: - protection enabled T: - protection disabled xx: - all binary I/P's (or O/P's of protection functions)
power P-Setting Characteristic angle Angle Reset ratio Drop-Ratio Delay Delay Phase error compensation Phi-Comp Rated power PN The value entered for ‘P-Setting’ is the power at which the function picks up referred to rated power ‘PN’. The parameter ‘PSetting’ has a setting range of 0.005 to 0.100 in steps of 0.001. The setting of the parameter ‘Angle’ determines the characteristic angle of the measurement. Its implications are explained below under "Real power" and "Apparent power". The desired reset ratio is set as a percentage of the pick-up value using the parameter ‘Drop-Ratio’. To ensure that the reset ratio is adequate for low values of ‘P-Setting’, the following condition is checked: 'Drop - Ratio 100 50 'P - Setting' 1 ' 100 An angle to compensate the relative phase errors of c.t's and v.t's can be entered using parameter ‘Phi-Comp’. The effective characteristic angle is the sum of the parameters ‘Angle’ and ‘Phi-Comp’. The setting for the rated power is left at PN = 1.000. The corresponding reference value in the ‘‘ANALOGUE CT/VT CHANNELS-AD CHANNEL REF VAL’ menu must be adjusted for rated voltages other than 100 V. Real power The real power component (real power component = proportion of real power current x displacement voltage) of the zero-sequence power is monitored to detect E/F's in systems with Petersen coils and high-resistance grounded systems. The neutral component of the current in the healthy phases resulting from their capacitances to ground and the inductive Petersen coil current unite at the fault location and return to the source via the faulted phase.