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Jun 01, 2020 · The details of the scheme algorithms and logic, along with respective relay settings are provided below. Download : Download high-res image (146KB) Download : Download full-size image; Fig. 2. Block scheme of the proposed transformer differential protection with integral and harmonic stabilization. protection transformer is differential relays. Differential relays working system using Kirchoff law where inflows equal outflows. If there are excessive currents that interfere then the relays will work. But, the relay can also experience decreased performance. Therefore, this final project aims to analyze the reliability of the differential ...
Calculate LT & HT Side Low current Setting(I>). Calculate LT & HT Side High Current Setting(I>>) Calculate LT & HT Side Actual Operating Time of Relay(t>) Calculate LT & HT Side Actual Operating Time of Relay(t>>) Calculate LT & HT Side IDMT Earth Fault Relay Setting (50N/51N) Calculate LT & HT Side IDMT Earth Fault Relay Pick up setting ...
Day 1 Introduction Introduction of protection Different types of abnormal conditions An overview of different kinds of protection Speed of protection devices – its criticality Main components of microprocessor relay How is microprocessor different from electromechanical relays Instrument Transformers Current … Continued
Table 3: Control Relays Overview 4. Relay Calculations 4.1 Relay calculations documents only show utilized settings. 4.2 All fault current values used for the relay calculations are based on information available as of the date of this document. 4.3 Any changes shall be approved by the settings engineer before record document is issued.
Equivalent secondary current at LV Side (6.9kV) in Iref, Amps Transformer LV side (6.9kV) current in Iref Differential current at -7.5% tap position Restraining current at -7.5% tap position Considering the recommended setting the operating current calculation. The differential current = 0.075A & the Bias current = 1.042A The Differential ...
In a differential relay, one CT has a connection with the transformer’s primary winding and the other CT with the transformer’s secondary winding. The relay relates the current values on both sides and when there is any destabilization in the value, then the relay will have functioned. There will be current, voltage, and biased types of ...
May 05, 2015 · calculation to find the primary and secondary current PRIMARY SIDE : – HV side full load current = Power / √3 x Voltage = 100×10^3 = 100000000 = 251 Amps
Sep 11, 2019 · Therefore, for a 1A relay, the bias current is: I B = (7.25 + 6.16) / 2 = 6.7 p.u. Differential current I 0 = 7.25 – 6.16 = 1.1 p.u. From Figure 2, a percentage bias of 20% would ensure stability for this condition.
IDMT relay settings and instantaneous relay settings calculations have been described in this video. These calculations are required for successful i.. A walk through setting up the software on the Freja relay tester to test a 3 phase differential transformer relay.
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•Project manager and customer set the schedule and budget. •Relay setting engineers develop the settings and produce a settings report and settings files that are to be loaded into the digital relays. •Checking engineers will review and separately calculate the settings to verify the settings engineers work. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is ... the relay location, or between six and ten times the rated current. Transformer units The instantaneous units of the overcurrent relays installed on the primary side of the transformer should be set at a value between 125 and 150 per cent of the fault current existing on the low-voltage side. This value is set higher than the transformer
The sensitivity of the percentage differential relay will typi-cally be about 30%–40% of tap setting. The tap setting should be selected so that 95% coverage of the winding is achieved. Single-phase percentage differential relays have long been available in electromechanical versions. Electronic per-
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A relay setting (in volts) is chosen, with sufficient margin, to ensure that the differential protection does not operate for this external fault condition. The resistance of the CT secondary windings and cabling must be known , and is used in the relay setting calculations . The differential relay was stable! My calculations were approximately correct! As soon as the substation was commissioned, the customer performed Z. Gajić, "Differential Protection Solution for Arbitrary Phase Shifting Transformer", International Conference on Relay Protection and Substation...the differential calculation. •3I 0 = [I a + I b + I c] I 0 = 1/3 *[I a + I b + I c] •Used where filtering is required, such as wye winding with wye CTs Phase Differential Digital Relay Application
Appendix (A) Transformer Differential Relay Calculation and Setting Siprotec Relay 7UT613. A.1 Transformer Differential Relay Calculation. Consider the three-phase transformer bank shown in Figure (A.1), for the main transformer in hilla gas substation with rated 63 MVA at 132/33kV, Yd1.
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Numerical Transformer Differential Relay provides differential protection for power transformer. Relay measures the line current of each phase from each windings of transformer. Relay calculate differential current (Id) and restraining current (Ir) per phase. The differential characteristics define the operating and the restraining regions. Features of Numerical Transformer Differential Relay: * Based current differential protection.
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Mar 30, 2017 · 2.3 Procedure for Relay Setting of Transformer Differential Relay KBCH Data Required MVA Rating Voltage ratio Vector group HV voltage LV voltage Transformer percentage impedance: Transformer vector group: OLTC Tap: +% OLTC Tap: -% CT ratio and winding configuration HV side LV side At Normal tap HV Side full load current = MVA / 3*kV Current on CT Secondary Ict (HV) = Rated Current (HV Side) / CT Ratio (HV Side) N1=Required ratio compensation = 1/ Ict sec Assuming Relay current = 1A N1 is set ... currents into the relay using the SEL AMS. This thesis explains the approach to set the differential element of the SEL 387 relay to protect a transformer against internal faults and the overcurrent element of the SEL 387 relay to protect transformer against external faults. A radial power system model is assumed and modeled using ASPEN ...
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Instrument transformers are used for measurement and protective application, together with equipment such as meters and relays. Their role in electrical systems is of primary importance as they are a means of "stepping down" the current or voltage of a system to measurable values, such as 5A or 1A in the case of a current transformers or 110V or 100V in the case of a voltage transformer. Calculate Differential Protection Relay setting: Calculate Percentage Differential Current at Normal tapping. Hi sir i am ramesh here,can explain about providing differential protection and REF Protection to transformer and also usage of ICT's in differential protection and also usage of...
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Dec 26, 2020 · Question: For The 3-ph 5 MVA, 11/3.3 KV AY Transformer, Shown In The Figure Below, Design A Differential Protection Scheme Using Available Standard CT Ratios With Y-connected CT On The HV Side And A- Connected CT On The LV Side. If The OC Relay Has Plug Settings Of 50% -200% Of The Relay Rated Current With 25% Increment, Find AY Transformer CTS A. 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. Click the appropriate Winding connections, CT connections, Phase Rotation, and Reference Winding settings. D W1Conn = W2Conn = W3Conn = W4Conn ... Table 3: Control Relays Overview 4. Relay Calculations 4.1 Relay calculations documents only show utilized settings. 4.2 All fault current values used for the relay calculations are based on information available as of the date of this document. 4.3 Any changes shall be approved by the settings engineer before record document is issued.
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distance relays ÒlookingÓ toward the bus to be set lower and still be selective. CURRENT-TRANSFORMER CONNECTIONS FOR DIFFERENTIAL RELAYS A simple rule of thumb is that the CTÕs on any wye winding of a power transfor mer should be connected in delta, and the CTÕs on any delta winding should be connected in wye. We will start the transformer differential protection calculation with the identification of the transformer vector group. The TAP setting compensation is automatically calculated in SEL relays by providing the appropriate transformer parameters and CT ratio.Primary current = 60 MVA / (1.732 * 253 kV) = 136.92 A Current in CT Secondary =136.92/500 = 0.273 As the adopted ratio correction is 3.18 the current to relay bias terminal = 0.273X 3.18 = 0.868 Amp At - 5 % tap condition current in HV bias circuit HV Side current = 60 MVA / (1.732 * 209 kV) = 165.75 A Current in CT Secondary = 165.75 / 500 = 0.331 With ratio compensation = 0.331 × 3.18 =1.054 Differential Current at Tap Extremities At -5% Tap Idiff1 = 1.054 -1 = 0.054 At +15% Tap Idiff2 ...
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Fault current in relay coil = 4000 x 5/400 = 50 A. Plug-setting multiplier (P.S.M.) = 50/6.25 = 8. Given when P.S.M is 8 time operation is 3.5 Sec. Actual relay operating time = 3.5 x Time-setting = 3.5 x 0.6 = 2.1 seconds We will start the transformer differential protection calculation with the identification of the transformer vector group. The TAP setting compensation is automatically calculated in SEL relays by providing the appropriate transformer parameters and CT ratio.the differential calculation. •3I 0 = [I a + I b + I c] I 0 = 1/3 *[I a + I b + I c] •Used where filtering is required, such as wye winding with wye CTs Phase Differential Digital Relay Application
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For ratings other than one second, the rating may be calculated as: I = ____ t where t is the time (in seconds) that the current flows, and K = 250A or 50 times tap, whichever is less (5A CT Models); or K = 50A or 10 times tap, whichever is less (1A CT Models). CURRENT SENSING BURDEN. Less than 0.1 ohm per phase. The percentage differential relay is designed to operate the differential current in terms of its fractional relation with actual current flowing through the circuit. It is used to protect the system under Current transformer saturation, unequal CT ratios, nuisance trip etc. It increases the stability of the differential protection relays.
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The differential relay was stable! My calculations were approximately correct! As soon as the substation was commissioned, the customer performed Z. Gajić, "Differential Protection Solution for Arbitrary Phase Shifting Transformer", International Conference on Relay Protection and Substation...Nov 11, 2019 · Figure 1 – Transformer Differential Protection. Transformer differential relays haverestraint coils as indicated in Figure 1. The value of the operate current has to be a certain set percentage higher than the current flowing in the restraint coils. For this reason transformer differential relays are said to percentage-differential relays.
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Abstract: This Paper Involves The Study Of Power Transformer Differential Relay Inrush Restraint Settings Applications. Criteria For The Setting And Testing Of Transformers Differential Relays Was Presented.The Setting Of The Inrush Restraint On A Per-Phase Basis On The Protected Transformerwas Performed. The The low set point is defined as the maximum differential current that exists in normal transformer operation. The causes of differential current are: Current transformer measurement errors . Current variants due to the use of an onload tap changer- Presence of auxiliary windings (e.g. for substation supply) 2.2 Setting of the threshold:
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Sep 01, 2013 · This decision block implements the characteristic of a percentage differential relay. function x = fcn( I ) i 1_ m = I (1:3); % I 1s i 2_ m = I (4:6); % I 2s i _setting1 = I (15); % current setting i _setting2 = i _setting1; k 1 = I (16); % bias percent k 2 = k 1 ; % I (8:10) → k 2 * I 2h (2nd harmonic) I (11:13) → k 3 * I 3h (3rd harmonic) inrush = ( I (8:10) + I (11:13)); % k 2 * I 2h + k 3 * I 3h i diff = abs( i 1_ m − i 2_m) − inrush; i bias = sqrt(2)*abs( i 2_ m + i 1_ m )/2 ... Mar 23, 2016 · Differential Protection Setting Calculations • 87H function is not blocked by any harmonic restraint • Pickup must be set above first peak of inrush current • 87H is used in almost all transformer differentials to overcome restraint of 87T due to CT saturation for high internal transformer faults • Typical pickup setting is 8 to 12 p.u ... SEL-787 Transformer Differential Protection Differential Pick-up Slope-1 Setting Slope-2 Setting Differential Unrestrained (U87P Please share some relay setting calculations excels ,pdf or doble or RIO test kit calculation files if you have any so that we could purchase it on this website ?
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