IDMT Relay High Current setting :Plug setting of Relay is 2.5 Amp and Time Delay (TMS) is 0.100 Sec, Relay Curve is selected as Normal Inverse Type; Calculation of Over Current Relay Setting: (1) Low over Current Setting: (I>) Over Load Current (In) = Feeder Load Current X Relay setting … Sequence Resistance Ω / Km} Resistance* 80 % of Protected Line} 7. 9. = 7SA522. 6. %%EOF �;����3S7�j�j���3Н�}S]H$R[^�Y�4�G!~^{v����ǯT&(���O�sN9�! H�\��j�@��z�9&���������aX�>�,�A, Y>��wJ��Y��C�ݩ��)\���w�O�µ]3�-�ͥ�4��9\��iH�ʥ���u���a���?�6L]v��G�n��.��]��k׆S�{N3�І�X7a��sH�,^kW��k����o�ˎ�潞����,���[��J~���U��%��99�,d{�+Y�F6�3��"���&�PK�%�hII.��� 0 One approach to making a distance relay with a computer is to calculate the apparent calculation scribd. ABB RET670 Calculations. 9o�#.��}� �*&� n�: = {Tower Footing Resistance (Primary) * CT / PT Ratio} ‘ The equation now reads :T = + K3 EI sin (150” - 0) for a relay where y = 60°.This is recognizable as a direc- tional element, wherein positive, contact-closing, torque is realized for values of 0 between 330° and 150°, with maximum positive torque at 0 = 60°. See our Privacy Policy and User Agreement for details. motor protective settings 101308 levine lectronics and. endstream endobj 261 0 obj <>stream 1.03 Make = SIEMENS. Calculate LT & HT Side IDMT Over Current Relay PSM. Zone – 1 = 80% of Protected Line Alternatively, 0.15A is the minimum diff current required for relay operation if the system loading is 0.5A (sec). As the impedance of a transmission line is directly proportional to its length, it can easily be concluded that a distance relay can only operate if fault is occurred within a predetermined distance or length of line. ZONE SETTINGS: We are accustomed to providing calculation and relay setting documentation in meticulous detail. Zone – 2 = 100% of Protected Line + 20% of Adjacent Shortest Line ��,Ǚ���?�Z|�q����4�i�㲌�2'���_S��U��� ���� MiCOM P643 Calculations. •RF=RARC + RTOWER FOOTING The relay measures the sum between line impedance (if fault at 100% of the line) and the fault resistance 11. DISTANCE RELAYS FUNDAMENTALS J. G. Andrichak, G.E. Positive Sequence Reactance = {Line Length * Positive Sequence Support Relay Testing Spreadsheets Acceptance tests are normally performed when a relay is received, prior to in-service settings be­ing applied. As the time setting multiplier is 0.1 here, actually the moving parts of the relay have to travel only 0.1 × 100% or 10% of the total travel distance, to close the relay contacts. Understanding Distance Protection & distance protection relay Why Distance Protection > Since the impedance of a transmission line is proportional to its length, for distance measurement it is appropriate to use a relay capable of measuring the impedance of a line up to a predetermined point (the reach point). Substations The relay will now use 30% of this ITOTto derive its actual restraint current, i.e. Clipping is a handy way to collect important slides you want to go back to later. Scope This document introduces the application of the distance protection function in the REF 542plus feeder terminal. Electrical Protection & Control. Types of Distance or Impedance Relay. 4. 5. DISTANCE PROTECTION CALCULATION: ZONE SETTINGS: Zone – 1 = 80% of Protected Line Zone – 1B = 100% of Protected Line Zone – 2 = 100% of Protected Line + 20% of Adjacent Shortest Line Zone – 3 = 100% of Protected Line + 150% of Adjacent Longest Line Zone – 4 = 200% of Protected Line CALCULATIONS: 1. Generator Protection Alstom Micom p343 Testing Procedure, Transformer protection Alstom make micom relay p64x/p63x testing procedure, Line Differential - Test report for Alstom make Micom P546 relay, Motor Protection P225 Alstom make testing using sverker750, Sel411l line differential relay testing procedure, RET 670 transformer protection - testing procedure, Testing procedure and electrical tests done on battery and battery charger, Alstom 14x feeder protection testing procedure, No public clipboards found for this slide, Distance protection calculation formulas and procedures, Senior Power System Electrical Engineer. Calculate LT & HT Side IDMT Over Current Relay Setting (50/51) Calculate LT & HT Side IDMT Over Current Relay Pick up setting. The number of relay elements required for complete schemes is usually quite large. Reactance* 80 % of Protected Line} 2 : Model setting calculations -Line 1-149 3 : Model setting calculations-Transformer 1-132 4 : Model setting calculations- Shunt Reactor 1-120 5 : Model setting calculations- Busbar 1-15 6 : Relay setting guide lines for transmission lines 1-19 7 : Recommendations for protection system management 1-5 ETAP StarZ Transmission Line Protection software provides tools to examine and check the performance of distance relay settings, user logic, and communication interfaces. Positive Sequence Resistance ={ Line Length * Positive Sequence Irest= 0.3 x 0.5 = 0.15A (see point P on the restraint characteristic). Distance protection explanation with formulas and simple procedures for beginners. i.e. See our User Agreement and Privacy Policy. 1.02 Description = Distance + Over Voltage Prot. Accordingly, relay settings = current plug tap 5 A (100%) and time multiplier 0.8. 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