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21, GE 12CEYG51B(-)D GEK-26423 The system constants in the above equations should be evaluated for a single phase to ground fault in the non-tripping direction at the relay terminals. This fault location is designated as Fl in Figure 5. T = Minimum permissible tap setting in percent. C = Positive sequence distribution constant C 0 = Zero sequence distribution constant 21 = System positive sequence impedance as viewed from the fault. = System zero sequence impedance as view…
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23, GEK-26423 RESTRAINT TAP BLOCK Ml UNIT M2 UNIT M3 UNIT FIG. 1 (8039015) RELAY TYPE CEYGS1A OUT OF CASE (3/4 FRONT VIEW) TARGET SEAL—IN UNIT P11 21
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27, GEK-26423 FIG. 5 (0208A5544-O) TYPICAL TRANSMISSION SYSTEM 138KV I 38KV H 30 MILES F I2MILES -H F2 J Ft 36 MILES I 38KV 25
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40, GEK-26423 STARTING UNIT SEE TABLE VII FOR STUD CONNECTIONS FIG. 16 (D?27A1005-O) SCHEMATIC DIAGRAM OF TEST CIRCUITS FOR CEYG51A RELAYS 120V 3 LOAD BOX 3 - 3 WIRE TEST CIRCUIT STARTING UNIT TA C f F I-I G (COMPENSATING WINDING) CENTER TAPPED 5 KVA AUTO TRANSFORMER zç’, cç 1 VAR IAC - RATED 20 AMPERES 3 - 4 WIRE TEST CIRCUIT LOAD BOX N 10% D B F 1% F H 6 (COMPENSATING WOG) 38
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12, GEK—26423 ACCEPTANCE TESTS Immediately upon receipt of the relay an inspection and acceptance test should be made to insure that no damage has been sustained in shipment and that the relay calibrations have not been disturbed. ViSUAL INSPECTION Check the nameplate stamping to insure that the model number, rating, and ohmic range of the relay received agree with the requisition. Remove the relay from its case and check by visual inspection that ther…
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3, GEK-26423D INSTRUCTIONS GROUND DISTANCE RELAY TYPE CEYG51A GE Protection and Control 205 Great Valley Parkway Malvern, PA 19355-1337
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6, GLK-26423 Whether or not zero sequence current compensation is used, the ground mho units may be subject to in ccrrect operation on ground faults immediately behind the relay terminals. This will be dependent upon the line impedance and system conditions. It may he necessary to 1 unit the mho unit reach setting in order to avoid this false tripping. Appendix II gives the liniiatations of the mho unit reach setting when zero sequence current compensatio…
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11, GE 12CEYG51B(-)D GEK-2 64 23 Since all the values of T in the above table are negative, these equations impose no restrictions on the tap setting for this application. Thus, the relays may be set in the range of 10 to 61 percent. Since the 61 percent setting will insure that the relay will reach only to the remote bus, a lower setting should be used. It is desirable to set the relay to reach at least 25 to 50 percent beyond the remote terminal. Thus, for 50 percent ad…
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37, FIG. 13C (0273A9029-0) TYPICAL TIME-CURRENT CHARACTERISTIC WHEN TYPE CEYG51A IS USED WITH 100 PERCENT COMPENSATION GEK-26423 3.) 1) (f) 1 2. C w I-— I.5 EEEEEEEEHHHLIIWHH E — TYpF CEYG5IA RELAY — — — —. TIME-CuRENT CHAACTER STC — F DR PHASE CR Th UND FAULTS — * C PENSATI N =IDD — FFAULT )HMS ZFSELY REACH SETTING l H1S E H HE E H E E E E E H E : = = : = = = = : = = = = = = - __ - r- - - ———s —— z -.--—--—�…
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25, GE 12CEYG51B(-)D Si _9929’ B B> B> A 0 NIl 2 Q-j M3 AçA a 0 a 6 8 10 1=TOP HT ;12IDDLE UNIT SHORT FINGER r3=SQTTOM UN T FIG. 3 (0178A9106—1) INTERNAL CONNECTIONS DIAGRAN FOR THE CEYG51A RELAY GEK-26423 15 17 19 ii 13 /1\ TI1 T 23Ts1 Ml 1 2 4 23
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42, GE 12CEYG51B(-)D GEK-264?3 S EXT. S.U. tvUO CHARACTER I STI C TEST PLUG (UPPER) I2XLAI2AI TEST PLUG (LOWER) I2XLAI2AI FIG. 18 (0221A7006-2) TEST CIRCUIT FOR FIELD TESTING THE STARTING UNITS A 3 PHASE, 4 WIRE TEST SOURCE OF THE CEYG51A RELAY USING ØA LOM 60 X øC II F D C EXT. JUMPER IL1/L. \ SEL ECTORN SWITCH / 1’ FAULT SFL -a OUTPLW / lit’ N SELECTOR XL RL ri JUMPER 13 I4 J ‘AH Z 600 CONNECTIONS SHOWN FOR TOP UNIT. CHECK…
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26, C, 0 U, C F’.) I-’ >< -l I C-) C C-, -I C C I r ci, C., 0 wF T(TE PT SE)NDAPIES coNNTrr r• . ISf TO p2i r _____ F 0—2 A D4 91( IF POTENTIAL POLARIZATION IS USED, C)ECT A TO C A B TO 0. IF POTENTIAL POLAPIZA’ON IS NOT USED, CONNECT C TO 0 ONLY. TEi:(FPC, E V 1EN USED FOP REVERS9 CARRIER STARTUG, REVERSE CONNS. TO STUDS .4 ‘A 7.-R, 9—10 OF PIE CEY. CEYG ‘iT ‘J3 FOP CARRIER TO TPAIISFERPED TRIPPING OR STARTING DIRECT…
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16, GEK- 26423 The mho unit should therefore theoretically close its contacts at 46 percent and remain open at 41 percent. A range of 40 to 54 percent in the balance point (+14 of the nominal) is satisfactory tolerance for the rnho unit. If the ohmic reach of the mho unit checks correctly according to the above procedure, the angle of maximum torque is probably correct also. The angle can be verified if desired by …
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34, GEK-26423 FIG. 12 (0208A3583-O) CURE ADJUSTMENT A A. INNER STATOR OR CORE B. MAGNET A COILS C. WAVE WASHERS D. OCTAGON NUT FOR CORE ADJUSTMENT E. FLAT WASHER F. CORE HOLD DOWN NUT (HEXAGON) —F 32
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17, GEK- 264 23 R 22 — M2 unit angle of niaximulTi torque adjustment R 13 - M3 unit restraint angle adjustment R 23 - M3 unit angle of maximum torque adjustment NOTE: Before making pickup or phase angle adjustments on the mho units, the unit should be allowed to heat up for approximately 15 minutes energized with rated voltage. Also it is important that the relay be mounted in upright position so that the units are level. RESTRAiN…
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2, GEK-34169 cV> Bb> vi2 0 M3 A 1 57 M1TOP UNIT M2=MIDDLE UNIT SHORT FINGER M3=BOTTOM UNIT FIG. 1 (0246A3351-O) Internal Connection Diagram For The CEYG51B(-)D Relay B Ml A 1 4 6 8 10 GENEtAL ELECTRIC COMPANY, PHILADELPHIA, PA
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36, 30 37.5 45 45 60 75 90 FIG. 13B (0273A9030-O) TYPICAL TIME-CURRENT CHARALTERISTIC WREN TYPE CEYG51A IS USED WITH 50 PERCENT COMPENSATION GEK-26423 4.0 3.5 3.0 LI) 4: Lfl w -j (-) >- Q 2 .O z Lii I— 1.5 l.0 0.5 3J1TAP 0 2-fl-TAP 0 IJLTAP 0 5 7.5 I0 15 15 I5 30 20 25 AMPERES 30 34
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20, GEK- 26423 If the solution to equation lb yields a tap value CT) greater than 100 percent. this implies that even the shortest reach setting possIble (100 percent tap) will suffice. The factor 1.25 introducted in equation lb is a safety factor. In order to extend the reach of the relay beyond the far bus, lower tap settings will be required. If there is no zero sequence mutual impedance, the last term in the denominator of equat…
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14, GEK- 26423 6. Target Seal-in Unit - With the target in the down or unexposed position, check pickup on both taps. Use a DC source with the circuit arranged so that test current through studs 1-11, with Ml contact held closed, can be gradually increased to the pickup point. Pickup current should be tap rating or less. Refer to the section on Target Seal-in Unit Settings under INSTALLATION PROCEDURE for the recommended steps to change the …
