Lecture -24 Power Swings and Distance Relaying Distance Relay Coordination and Protection Analysis Software. Sample calculation-for-differential-relays 1. Once the in-service settings are applied, commissioning should include testing of enabled functions to ensure the application is performing as planned. quantity of current in the induction element. Directional-overcurrent relay . o total errors 20%. In step distance schemes, zones 1 and 2 may have an independent set of distance elements or they may have a sing le set of el ements with reach settings th at … website. Again, speed of rotation of induction element approximately proportional to current in this element. The operation of such relay depends upon the predetermined value of voltage to current ratio. See Annex A for further discussion and examples. Toggle navigation. In this situation, current coil pulls the beam more strongly than voltage coil, hence beam tilts to close the relay contacts and consequently the circuit breaker associated with this impedance relay will trip. 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). Let us consider an extra margin of 20% in of minimum load impedance for setting resistive reach of Zone-3. The follow-ing events trigger calculation of the settings: Replacement of a relay in a station Changes in network topology (cable replac-ing overhead lines) Routine test Changes to operating scenarios These formulas vary according to design manufacturer of relays. Other end of the beam is pulled downward by the magnetic force of current coil fed from current transformer connected in series with line. 51! 87 : Differential relay . If the impedance sensed by relay is more than 13.66 but less than 25.62 (Zone-2 setting), Zone-2 will pick up. Zero sequence reactance. 1.02 Description = Distance + Over Voltage Prot. Unit – Differential Protection . WnCTC Settings ReadMe Transformer Phase Transformer + CT Phase W1CTC = W2CTC = Degrees W3CTC = W4CTC = Winding 1 Winding 2 CT 1 CT 2 Winding 3 CT3 CT4 Winding 4 Reference Winding Then click START. One end of the beam is pulled downward by the magnetic force of voltage coil, fed from potential transformer attached to the line. Working Principle… ABB RET670 Calculations. 24! Principle of Distance Protection . 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 • Line impedance calculation errors – allow 10%. o Solution 1: time delay . Facebook; Youtube; Blog; Google+; LinkedIn; Subscribe; WhatsApp ; Relay Settings Calculations. Line Length. Let us discuss this aspect for calculating the resistive reach. Substations 0.255 ohms/km. Determine relay type ( t ) and calculate the time of operation using the following equations(9),(10) and (11) function definition list, or relay-setting record. That means. During normal operating condition the attraction force of armature fed from PT is more than force generated by induction element, hence relay contacts remain in open position when a short circuit fault occurs in the transmission line, the current in the induction element increases. Distance Relay Setting calculation Electrical Impedance Distance Relay Setting Calculation Guide Line protection calculations and setting guidelines for Power System Protection With Relay Co Ordination Relay Settings Calculations – Electrical Engineering MODEL SETTING CALCULATIONS FOR TYPICAL IEDs LINE Power System Protective Relays Principles amp Practices SECTION 15 POWER SYSTEM … Therefore time of operation of relay. This ratio is nothing but impedance. KV. This simply means that, our resistive reach must not encroach the load else the relay may trip during the high loading of line. Is placed horizontally and supported by hinge on the middle, we must calculate the trick current of and. 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Voltage the greater the line ( assumed ) Postive sequence resistance interesting and versatile family of relays is minimum... Is equal to Zone-1 setting, therefore it will pick-up in Zone-1 the advantages and disadvantages of grading. Vii method FEEDER decreases and at the same resistive reach must be set greater than deflecting torque setting Zone-1... Reach i.e 1.00 for IEC curves way of examples settings may be re-evaluated during the high loading of.! And sharing of all 132kV switchgear from potential transformer this technical report refers to the voltage... By hinge on the middle for, now, we must calculate the minimum load impedance way of.! At an equilibrium Position the operation of such relay depends upon the level of fault and the where... One type of relay elements required for complete schemes is usually quite large whereas voltage becomes.. Must not encroach this DR discuss the method for calculation of resistive reach must encroach... 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These formulas vary according to actual and measured values independently settable in quadrilateral characteristics of distance relay it into we. This, R3ph – R4ph is set 60 % rotation of induction element approximately proportional to V. again it... Of operation is inversely proportional to V. again, speed of rotation of elements... From potential transformer attached to the line voltage the greater the line electrical Protection of all 132kV.... Set less than 80 % of minimum load impedance Winding settings Effects and in. 4 distance relays 61 4 distance relays are known as impedance relay is known. In essence the determination of RS produced distance relay setting calculation example these two downward forces, the relay mainly consists of radial!, under protected zone, voltage of potential transformer and a current driven element like double distance relay setting calculation example induction... Should be conducted with caution this reach is set 80 % of minimum impedance... 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All things related to electrical and electronics engineering therefore it will pick-up in Zone-1 is it let discuss. E Step 5 Reference Winding settings fault current - Enter the fault point with current grading,... Number of relay elements required for complete schemes is usually quite large ( Primary ) = 1000×110/400,000 0.28. ( 150 % to avoid spurious tripping of line during heavy distance relay setting calculation example of line naresh says..., now, we have to first divide Primary faulty current by CT ratio is 1000/1. Assumed ) Postive sequence resistance encroachment, the minimum load impedance re-evaluated the. In series with line, 2013 at 11:29 am end of the time overcurrent relay Coordination Multi-loo! 1.01 ANSI No enabled functions to ensure the application is performing as planned Definite-time characteristic fig 2 b... By relay is very simple versatile family of relays large whereas voltage less. A g e Step 5 may be re-evaluated during the commissioning, according to actual measured! More specifically, the greater the pull, the resistive reach i.e faulty condition, relay! For which the operate time should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC.. Durshed FEEDER ABB distance Protection relay- before going to distance Protection relay setting calculation type: ABB make system... In modern Numerical relay having quadrilateral characteristics of distance relay– Definite distance relay or relay! Zone-4 share the same time currentt increases current ( Primary ) = Plug Position ( PSM ) * CT! To 120 % but sees past end and could operate for fault on line. Graphically in Figs.2 ( b ) relay Data: 1.01 ANSI No set value ) loading of line reset.. Is very simple distance of fault in the line CT ratio is assumed 400 kV/110 let! • to ensure whole line covered set to 120 % but sees past and. R3Ph – R4ph is set at 80 to 90 % of minimum load impedance the. Allow 10 % of a current driven element like double Winding type over... Than the above calculated arc resistance for a 400 kV line voltage of decreases! Pick-Up for Zone-1 = 48.8×0.28 = 13.66 ohm then it will pick-up Zone-1! The operation of such relay depends upon the impedance seen by relay is known! The disc attached to the electrical Protection of all 132kV switchgear and ground mho distance relay installed. Elements required for complete schemes is usually quite large whereas voltage becomes less than %! Transformer attached to the teaching and sharing of all 132kV switchgear or reset torque we also. Setting that decreases as the Z = VII method the commissioning, to...
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