ABB SDG-1T Instruction Leaflet Download Page 40 | Manualshive

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ABB SDG-1T Instruction Leaflet Download Page 40

I.L. 41-496.52D

42

S = 1
S = 2
S = 3

WHERE ZOS = Z1S

S = 1, 2, 3 WHERE SOURCE IMPEDANCE Z0S = 3Z1S

IMPED

ANCE IN PERCENT

OF RELA

Y SETTING

VF -FAULTED PHASE-TO-GROUND

VOLTAGE AT REALY TERMINALS

0

5

10

75

80

85

90

95

100

105

110

80

70

60

50

40

30

20

10

5

0

Figure 19. Impedance Curve for the SDGT Line of Relays

Sub 3
878A006

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Summary of Contents for SDG-1T

Page 1: ...ts included The I0 fault detector prevents potential circuit trouble from causing immediate trip The frequency verifier should be utilized for all high speed trip applications to avoid tripping on line energization or other condi tions that cause high frequency transients The phase to phase desensitizer is used to eliminate a possible overreach on two line to ground faults This circuit is needed f...

Page 2: ...to underreach on one phase and overreach on the other faulted phase The SDG 1T and SDG 2T relays contain a desensitizer circuit to prevent overreach on 2L G faults by reducing the reach of the relay The restraint voltages VXN VYN VZN are obtained by the use of compensators with an impedance ZC set to match the desired positive sequence line imped ance reach Only positive and negative sequence volt...

Page 3: ...hat the phase compensation is almost enough to reverse VXN polarity It is possible for such a reversal to occur and it is possible if very little zero sequence flows for the phase compensation to overtake the operating voltage and restrain the relay Thus the relay may fail to see a close in fault if the zero sequence current is quite small Any time this extreme condition occurs the phase distance ...

Page 4: ...TA2 TB2 TC2 TO2 The phase splitter transformer provides isolation between the ac analog network and the magnitude comparator circuitry located on the printed circuit board and couples the restraint and operating out puts to the phase splitter network The tap connec tion on the secondary winding serves as part of the phase splitting circuit that converts a single phase input into a three phase outp...

Page 5: ...turation by the output of the TFV transformer Transistor Q5 conducts until capacitors C6 or C7 respectively are fully charged While either capacitor is charging through R29 tran sistor Q5 drives transistor Q6 to discharge timing capacitor C9 thus starting the timing cycle with close to zero charge on the capacitor The function of the timing capacitor is to delay the operation of the relay for 5 mi...

Page 6: ...e characteristic is shown since the other two fall well out of the first quadrant One might conclude from Figure 14 that the relay is not directional since its characteristic includes the origin This conclusion would be erroneous since the characteristic equations assume faults in the trip direction per Figure 14 and do not apply for reversed faults The relay is directional In Figure 14 the sec on...

Page 7: ...one1 reach to be 85 of the line if S 1 is used 75 if S 2 or 3 are used Do not change angle for pilot trip or Zone2 or Zone3 applications Assume a desired balance point which is 85 of the total length of the line The general formulas for set ting the ohms reach of the relay are The terms used in this formula and hereafter are defined as follows Z0 Zero sequence ohmic reach to be used for relay sett...

Page 8: ...e is followed when R1 R2 R3 R4 set tings are changed otherwise follow alternative pro cedure below Step 2a In Table IV we find 7 65 to be the nearest value to 7 77 ohms or 1 2 from the desired value For the Zθ selection find the nearest value to 23 31 ohms using the same S setting as above 23 0 ohms is the nearest value or 1 2 within the desired value Step 2b From Table IV read off S 1 T 8 7 T0 26...

Page 9: ... 26 3 00 4 04 09 09 03 244 325 405 570 732 975 1 30 732 975 1 22 1 71 2 20 2 92 3 92 06 06 09 237 316 396 555 710 950 1 27 710 950 1 18 1 66 2 13 2 84 3 80 03 03 0 230 307 383 537 69 920 1 23 69 921 1 15 1 61 2 07 2 76 3 69 0 0 0 0 223 298 370 520 670 892 1 19 670 892 1 12 1 56 2 00 2 68 3 58 03 0 03 216 288 360 505 650 865 1 15 650 865 1 08 1 52 1 95 2 60 3 46 06 09 06 209 280 348 488 627 840 1 1...

Page 10: ...50 4 52 6 00 8 05 9 05 12 1 09 09 03 488 650 810 1 13 1 46 1 95 2 60 2 92 3 92 1 46 1 95 2 44 3 41 4 40 5 85 7 80 8 80 11 8 06 06 09 474 632 790 1 10 1 42 1 90 2 53 3 80 1 42 1 90 2 37 3 32 4 26 5 70 7 60 11 4 03 03 0 460 614 766 1 07 1 38 1 84 2 46 3 69 1 38 1 84 2 30 3 22 4 14 5 52 7 38 11 1 0 0 0 0 446 596 740 1 04 1 34 1 78 2 40 3 58 1 34 1 78 2 24 3 12 4 02 5 35 7 15 10 7 03 0 03 R OVER L 432...

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Page 12: ... 9 50 3 94 4 90 6 89 9 81 14 7 20 6 28 4 09 09 03 1 27 1 59 2 22 3 18 4 77 6 70 9 25 3 82 4 77 6 70 9 54 14 3 20 0 27 7 06 06 09 1 24 1 55 2 16 3 09 4 64 6 50 8 95 3 71 4 64 6 50 9 27 13 9 19 5 26 9 03 03 0 1 20 1 5 2 10 3 00 4 50 6 30 8 70 3 6 4 0 6 30 9 0 13 5 18 9 26 1 0 0 0 0 1 16 1 45 2 04 2 91 4 36 6 10 8 45 3 50 4 36 6 10 8 73 13 1 18 3 25 2 03 0 03 1 13 1 97 2 82 4 23 5 90 8 15 3 38 5 90 8...

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Page 14: ...6 54 9 81 13 8 19 0 28 4 7 88 9 80 13 8 19 6 29 4 41 2 56 8 85 2 09 09 03 2 54 3 18 4 44 6 36 9 54 13 4 18 5 27 7 7 64 9 54 13 4 19 1 28 6 40 0 55 3 83 0 06 06 09 2 48 3 10 4 32 6 18 9 27 13 0 17 9 27 0 7 42 9 28 13 0 18 5 27 8 39 0 53 8 80 5 03 03 0 2 4 3 0 4 20 6 0 9 0 12 6 17 4 26 1 7 20 9 0 12 6 18 0 27 0 37 8 52 2 78 3 0 0 0 0 2 32 2 90 4 08 5 82 8 73 12 2 16 9 25 2 7 00 8 72 12 2 17 5 26 2 3...

Page 15: ...this insert and retighten the connector screw in the center Since the link and connector screws carry operating current be sure that the screws are turned to bind snugly Com pensator secondary tap connections are made through two leads identified as L and R for each com pensator These leads come out of the tap plate each through a small hole one on each side of the vertical row of M tap inserts Th...

Page 16: ...h button Check For SDG 2T only open relay terminal 10 and 11 Using the test connections of Figure 9 Connect the ac voltages as per test No 1 No current connections are required Connect the rated dc voltages as shown Open circuit connections to terminal No 7 Set VBN VCN 70 volts Depress the white push button The push button should light If the push but ton does not light observe contact operation I...

Page 17: ...itions under certain volt age and phase angle conditions two phase to ground desensitizer will distort phase angle response hence it is required to disable the 2φ G circuit for SDG 1T by opening the front switch OR connect a 10K resistor from the cathode of Z6 on the 2φ to Gnd to module to relay terminal 2 for SDG2 T relays To disable transient blocking circuit short out resistor R48 on large prin...

Page 18: ...ng contact should touch both stationary contacts simultaneously 6 ROUTINE MAINTENANCE The relays should be inspected periodically at such intervals as may be dictated by experience to insure that the relays have retained their calibration and are in proper operating condition In Service Test If Relay is Set for S 1 Only SDG 2T Only In service testing is performed as follows 1 Open relay trip circu...

Page 19: ... 6 and 8 Adjust R6 until voltages across terminals 7 and 6 and 7 and 8 are equal 1 volt to each other and are within 1 0 volt of voltage across 6 and 8 If an oscilloscope is available observe voltage across R10 and set R6 so that peaks are in ascending order R7 Adjustment Measure the voltage across terminals 17 and 18 Adjust R7 until voltages across terminals 15 and 18 and 15 and 17 are equal 0 1 ...

Page 20: ...3 tap 6 0 0 6 volts between 0 tap and 09 tap 9 0 1 0 volts between0 tap and 06 tap MB Taps Use test connection No 2 and repeat above MC Taps Use test connection No 3 and repeat above M0 Taps Use test connection No 4 and repeat above For 2 4 35 ohm relay NOTE Provide a jumper from terminal 19 to cen ter tap of the T0 tap block for the SDG 1T relay MA taps Use connection No 1 of Figure 9 Pass 20 amp...

Page 21: ... the limits If it is desired to check relay response at some other settings use following equation for the trip value of current I Z0 Zero sequence reach Z1 Positive sequence reach in above cases p 3 VLN Faulted Phase Voltage 7 1 1 30 Ohm Relay 7 1 1 SDG 1T SDG 2T and SDG 4T Relays Using previous relay tap settings apply rated dc volt age and proceed as follows Part A 2 5 VOLT TEST Phase A Use tes...

Page 22: ... met see special note under Impedance Test Part B 20 VOLT TEST Phase A Use test connection No 5 Set VAN 20 volts VBN VCN 70 volts Set phase shifter for 75 current lag ging voltage Pickup current IA should be 8 05 8 55 amps current lagging VAN voltage by 75 Phase B Set VBN 20 volts VAN VCN 70 volts Use test connection No 6 Pickup current IB should be 8 05 8 55 amp current lagging VBN voltage by 75 ...

Page 23: ...HOTO 5 Detailed Internal Schematic of SDG 1T Relay with Parts List 6694D74 6 Internal Diagram of Type SDG 2T 719B766 7 Detailed Internal Schematic of SDG 2T Relay with Parts List 6694D77 8 SDG 4T Detailed Internal Schematic Relay with Parts List Double Contact 1339D60 9 Test Connections for SDGT Line 1495B95 10 Typical Operating Time Curves 9646A38 11 Distance Phase and Distance Ground Relaying Ex...

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Page 34: ... 52D 36 Figure 12 Outline and Drilling Plan for the SDGT Line Relays in an FT 42 Case Sub 19 57D7905 AIR GAP PRIMARY SECONDARY LAMINATED CORE V ADJUSTABLE ANGLE I Figure 13 Compensator Construction Sub 1 849A034 ...

Page 35: ...I L 41 496 52D 37 Figure 14 Impedance Circles for the SDG Line Relays C 837A115 A 837A116 B 837A114 b Medium Length Line c Short Line a Long Line ...

Page 36: ...POINT TRACES D C NEG REF NO TRIP TRIP SDG 1T EQUIVALENT TEST POINTS SDG 2T SDG 4T 1 1 1 2 2 2 3 3 4 4 5 5 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10 11 11 11 12 13 14 15 0 7 7 6 7 6 0 7 SA B C 1 T A B C 1 23Ω T O 3 69Ω MA B C O 18 V A G 2 5VAC V 3φ G 70VAC V B C G 70VAC I3φ G 0 IA G 3AMP Sub 1 9646A39 ...

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Page 38: ...I L 41 496 52D 40 Figure 16 Definition of Terms Sub 2 837A125 Figure 17 Fault Resistance TOTAL LINE Z1L Z0L Sub 2 837A125 ...

Page 39: ... Selected Points Sub 2 837A117 2IG BALANCE POINT VA1 VA2 V0 VXN VA1 VA2 VA1 VA2 VA1 VA2 K1I1 K2I2 K0I0 VWO VO VWO VO VWO VXN VXN VO VWO VO VXN K1IA1 K2IA2 ZC VA1 VA2 K0I0ZC Z1L ZOL K1IA1 K2IA2 ZC K0I0ZC Z1L ZOL K0I0ZC Z1L ZOL K1IA1 K2IA2 ZC K1IA1 K2IA2 ZC K0I0ZC Z1L ZOL ...

Page 40: ...WHERE SOURCE IMPEDANCE Z0S 3Z1S IMPEDANCE IN PERCENT OF RELAY SETTING VF FAULTED PHASE TO GROUND VOLTAGE AT REALY TERMINALS 0 5 10 75 80 85 90 95 100 105 110 80 70 60 50 40 30 20 10 5 0 Figure 19 Impedance Curve for the SDGT Line of Relays Sub 3 878A006 ...

Page 41: ...I L 41 496 52D 43 Figure 20 SDG 1T Component Location of Magnitude Comparator Board Sub 2 774B971 ...

Page 42: ...I L 41 496 52D 44 Figure 21 SDG 2T Component Location of Magnitude Comparator Board Sub 2 774B972 ...

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Page 44: ...52D 46 Figure 23 SDG 1T 2T 4T Component Location of Phase Splitter Rectifier Board Sub 1 716B095 19 I D63 D62 D69 D67 D16 D18 D17 D15 D13 D20 D22 D24 D23 D21 D19 D11 D7 D9 D1 D3 D5 D6 D4 D14 D70 D71 D12 D8 D10 D2 ...

Page 45: ...I L 41 496 52D 47 Figure 24 SDG 1T and SDG 2T 2φ Ground Board Parts Location Sub 1 774B966 Ref Dwg SYS SCHEM SDG 1T 6694D74 SYS SCHEM SDG 2T 6694D77 ...

Page 46: ...rts Location Figure 26 SDG 2T Capacitor Restraint Filter Board Parts Location 1 2 3 4 5 6 7 8 9 C13 C14 C15 D55 D54 REF DWG CKT BD ASSY 203C377G06 SYS SCHEM 6694D74 Sub 1 3507A85 1 2 3 4 5 6 7 8 9 C13 C14 C15 REF DWG CKT BD ASSY 203C377G07 SYS SCHEM 6694D77 Sub 1 3507A86 ...

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